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Diffstat (limited to 'gas/config/tc-i960.c')
| -rw-r--r-- | gas/config/tc-i960.c | 3349 |
1 files changed, 0 insertions, 3349 deletions
diff --git a/gas/config/tc-i960.c b/gas/config/tc-i960.c deleted file mode 100644 index d8c15c09911..00000000000 --- a/gas/config/tc-i960.c +++ /dev/null @@ -1,3349 +0,0 @@ -/* tc-i960.c - All the i80960-specific stuff - Copyright (C) 1989, 90, 91, 92, 93, 94, 95, 96, 97, 98, 1999 - Free Software Foundation, Inc. - - This file is part of GAS. - - GAS is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2, or (at your option) - any later version. - - GAS is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with GAS; see the file COPYING. If not, write to the Free - Software Foundation, 59 Temple Place - Suite 330, Boston, MA - 02111-1307, USA. */ - -/* See comment on md_parse_option for 80960-specific invocation options. */ - -/* There are 4 different lengths of (potentially) symbol-based displacements - in the 80960 instruction set, each of which could require address fix-ups - and (in the case of external symbols) emission of relocation directives: - - 32-bit (MEMB) - This is a standard length for the base assembler and requires no - special action. - - 13-bit (COBR) - This is a non-standard length, but the base assembler has a - hook for bit field address fixups: the fixS structure can - point to a descriptor of the field, in which case our - md_number_to_field() routine gets called to process it. - - I made the hook a little cleaner by having fix_new() (in the base - assembler) return a pointer to the fixS in question. And I made it a - little simpler by storing the field size (in this case 13) instead of - of a pointer to another structure: 80960 displacements are ALWAYS - stored in the low-order bits of a 4-byte word. - - Since the target of a COBR cannot be external, no relocation - directives for this size displacement have to be generated. - But the base assembler had to be modified to issue error - messages if the symbol did turn out to be external. - - 24-bit (CTRL) - Fixups are handled as for the 13-bit case (except that 24 is stored - in the fixS). - - The relocation directive generated is the same as that for the 32-bit - displacement, except that it's PC-relative (the 32-bit displacement - never is). The i80960 version of the linker needs a mod to - distinguish and handle the 24-bit case. - - 12-bit (MEMA) - MEMA formats are always promoted to MEMB (32-bit) if the displacement - is based on a symbol, because it could be relocated at link time. - The only time we use the 12-bit format is if an absolute value of - less than 4096 is specified, in which case we need neither a fixup nor - a relocation directive. */ - -#include <stdio.h> -#include <ctype.h> - -#include "as.h" - -#include "obstack.h" - -#include "opcode/i960.h" - -#if defined (OBJ_AOUT) || defined (OBJ_BOUT) - -#define TC_S_IS_SYSPROC(s) ((1<=S_GET_OTHER(s)) && (S_GET_OTHER(s)<=32)) -#define TC_S_IS_BALNAME(s) (S_GET_OTHER(s) == N_BALNAME) -#define TC_S_IS_CALLNAME(s) (S_GET_OTHER(s) == N_CALLNAME) -#define TC_S_IS_BADPROC(s) ((S_GET_OTHER(s) != 0) && !TC_S_IS_CALLNAME(s) && !TC_S_IS_BALNAME(s) && !TC_S_IS_SYSPROC(s)) - -#define TC_S_SET_SYSPROC(s, p) (S_SET_OTHER((s), (p)+1)) -#define TC_S_GET_SYSPROC(s) (S_GET_OTHER(s)-1) - -#define TC_S_FORCE_TO_BALNAME(s) (S_SET_OTHER((s), N_BALNAME)) -#define TC_S_FORCE_TO_CALLNAME(s) (S_SET_OTHER((s), N_CALLNAME)) -#define TC_S_FORCE_TO_SYSPROC(s) {;} - -#else /* ! OBJ_A/BOUT */ -#ifdef OBJ_COFF - -#define TC_S_IS_SYSPROC(s) (S_GET_STORAGE_CLASS(s) == C_SCALL) -#define TC_S_IS_BALNAME(s) (SF_GET_BALNAME(s)) -#define TC_S_IS_CALLNAME(s) (SF_GET_CALLNAME(s)) -#define TC_S_IS_BADPROC(s) (TC_S_IS_SYSPROC(s) && TC_S_GET_SYSPROC(s) < 0 && 31 < TC_S_GET_SYSPROC(s)) - -#define TC_S_SET_SYSPROC(s, p) ((s)->sy_symbol.ost_auxent[1].x_sc.x_stindx = (p)) -#define TC_S_GET_SYSPROC(s) ((s)->sy_symbol.ost_auxent[1].x_sc.x_stindx) - -#define TC_S_FORCE_TO_BALNAME(s) (SF_SET_BALNAME(s)) -#define TC_S_FORCE_TO_CALLNAME(s) (SF_SET_CALLNAME(s)) -#define TC_S_FORCE_TO_SYSPROC(s) (S_SET_STORAGE_CLASS((s), C_SCALL)) - -#else /* ! OBJ_COFF */ -#ifdef OBJ_ELF -#define TC_S_IS_SYSPROC(s) 0 - -#define TC_S_IS_BALNAME(s) 0 -#define TC_S_IS_CALLNAME(s) 0 -#define TC_S_IS_BADPROC(s) 0 - -#define TC_S_SET_SYSPROC(s, p) -#define TC_S_GET_SYSPROC(s) 0 - -#define TC_S_FORCE_TO_BALNAME(s) -#define TC_S_FORCE_TO_CALLNAME(s) -#define TC_S_FORCE_TO_SYSPROC(s) -#else - #error COFF, a.out, b.out, and ELF are the only supported formats. -#endif /* ! OBJ_ELF */ -#endif /* ! OBJ_COFF */ -#endif /* ! OBJ_A/BOUT */ - -extern char *input_line_pointer; - -#if !defined (BFD_ASSEMBLER) && !defined (BFD) -#ifdef OBJ_COFF -const int md_reloc_size = sizeof (struct reloc); -#else /* OBJ_COFF */ -const int md_reloc_size = sizeof (struct relocation_info); -#endif /* OBJ_COFF */ -#endif - -/* Local i80960 routines. */ - -static void brcnt_emit (); /* Emit branch-prediction instrumentation code */ -static char *brlab_next (); /* Return next branch local label */ -void brtab_emit (); /* Emit br-predict instrumentation table */ -static void cobr_fmt (); /* Generate COBR instruction */ -static void ctrl_fmt (); /* Generate CTRL instruction */ -static char *emit (); /* Emit (internally) binary */ -static int get_args (); /* Break arguments out of comma-separated list */ -static void get_cdisp (); /* Handle COBR or CTRL displacement */ -static char *get_ispec (); /* Find index specification string */ -static int get_regnum (); /* Translate text to register number */ -static int i_scan (); /* Lexical scan of instruction source */ -static void mem_fmt (); /* Generate MEMA or MEMB instruction */ -static void mema_to_memb (); /* Convert MEMA instruction to MEMB format */ -static void parse_expr (); /* Parse an expression */ -static int parse_ldconst (); /* Parse and replace a 'ldconst' pseudo-op */ -static void parse_memop (); /* Parse a memory operand */ -static void parse_po (); /* Parse machine-dependent pseudo-op */ -static void parse_regop (); /* Parse a register operand */ -static void reg_fmt (); /* Generate a REG format instruction */ -void reloc_callj (); /* Relocate a 'callj' instruction */ -static void relax_cobr (); /* "De-optimize" cobr into compare/branch */ -static void s_leafproc (); /* Process '.leafproc' pseudo-op */ -static void s_sysproc (); /* Process '.sysproc' pseudo-op */ -static int shift_ok (); /* Will a 'shlo' substiture for a 'ldconst'? */ -static void syntax (); /* Give syntax error */ -static int targ_has_sfr (); /* Target chip supports spec-func register? */ -static int targ_has_iclass (); /* Target chip supports instruction set? */ - -/* See md_parse_option() for meanings of these options */ -static char norelax; /* True if -norelax switch seen */ -static char instrument_branches; /* True if -b switch seen */ - -/* Characters that always start a comment. - If the pre-processor is disabled, these aren't very useful. - */ -const char comment_chars[] = "#"; - -/* Characters that only start a comment at the beginning of - a line. If the line seems to have the form '# 123 filename' - .line and .file directives will appear in the pre-processed output. - - Note that input_file.c hand checks for '#' at the beginning of the - first line of the input file. This is because the compiler outputs - #NO_APP at the beginning of its output. - */ - -/* Also note that comments started like this one will always work. */ - -const char line_comment_chars[1]; - -const char line_separator_chars[1]; - -/* Chars that can be used to separate mant from exp in floating point nums */ -const char EXP_CHARS[] = "eE"; - -/* Chars that mean this number is a floating point constant, - as in 0f12.456 or 0d1.2345e12 - */ -const char FLT_CHARS[] = "fFdDtT"; - - -/* Table used by base assembler to relax addresses based on varying length - instructions. The fields are: - 1) most positive reach of this state, - 2) most negative reach of this state, - 3) how many bytes this mode will add to the size of the current frag - 4) which index into the table to try if we can't fit into this one. - - For i80960, the only application is the (de-)optimization of cobr - instructions into separate compare and branch instructions when a 13-bit - displacement won't hack it. - */ -const relax_typeS md_relax_table[] = -{ - {0, 0, 0, 0}, /* State 0 => no more relaxation possible */ - {4088, -4096, 0, 2}, /* State 1: conditional branch (cobr) */ - {0x800000 - 8, -0x800000, 4, 0}, /* State 2: compare (reg) & branch (ctrl) */ -}; - -static void s_endian PARAMS ((int)); - -/* These are the machine dependent pseudo-ops. - - This table describes all the machine specific pseudo-ops the assembler - has to support. The fields are: - pseudo-op name without dot - function to call to execute this pseudo-op - integer arg to pass to the function - */ -#define S_LEAFPROC 1 -#define S_SYSPROC 2 - -const pseudo_typeS md_pseudo_table[] = -{ - {"bss", s_lcomm, 1}, - {"endian", s_endian, 0}, - {"extended", float_cons, 't'}, - {"leafproc", parse_po, S_LEAFPROC}, - {"sysproc", parse_po, S_SYSPROC}, - - {"word", cons, 4}, - {"quad", cons, 16}, - - {0, 0, 0} -}; - -/* Macros to extract info from an 'expressionS' structure 'e' */ -#define adds(e) e.X_add_symbol -#define offs(e) e.X_add_number - - -/* Branch-prediction bits for CTRL/COBR format opcodes */ -#define BP_MASK 0x00000002 /* Mask for branch-prediction bit */ -#define BP_TAKEN 0x00000000 /* Value to OR in to predict branch */ -#define BP_NOT_TAKEN 0x00000002 /* Value to OR in to predict no branch */ - - -/* Some instruction opcodes that we need explicitly */ -#define BE 0x12000000 -#define BG 0x11000000 -#define BGE 0x13000000 -#define BL 0x14000000 -#define BLE 0x16000000 -#define BNE 0x15000000 -#define BNO 0x10000000 -#define BO 0x17000000 -#define CHKBIT 0x5a002700 -#define CMPI 0x5a002080 -#define CMPO 0x5a002000 - -#define B 0x08000000 -#define BAL 0x0b000000 -#define CALL 0x09000000 -#define CALLS 0x66003800 -#define RET 0x0a000000 - - -/* These masks are used to build up a set of MEMB mode bits. */ -#define A_BIT 0x0400 -#define I_BIT 0x0800 -#define MEMB_BIT 0x1000 -#define D_BIT 0x2000 - - -/* Mask for the only mode bit in a MEMA instruction (if set, abase reg is - used). */ -#define MEMA_ABASE 0x2000 - -/* Info from which a MEMA or MEMB format instruction can be generated */ -typedef struct - { - /* (First) 32 bits of instruction */ - long opcode; - /* 0-(none), 12- or, 32-bit displacement needed */ - int disp; - /* The expression in the source instruction from which the - displacement should be determined. */ - char *e; - } - -memS; - - -/* The two pieces of info we need to generate a register operand */ -struct regop - { - int mode; /* 0 =>local/global/spec reg; 1=> literal or fp reg */ - int special; /* 0 =>not a sfr; 1=> is a sfr (not valid w/mode=0) */ - int n; /* Register number or literal value */ - }; - - -/* Number and assembler mnemonic for all registers that can appear in - operands. */ -static const struct - { - char *reg_name; - int reg_num; - } -regnames[] = -{ - { "pfp", 0 }, - { "sp", 1 }, - { "rip", 2 }, - { "r3", 3 }, - { "r4", 4 }, - { "r5", 5 }, - { "r6", 6 }, - { "r7", 7 }, - { "r8", 8 }, - { "r9", 9 }, - { "r10", 10 }, - { "r11", 11 }, - { "r12", 12 }, - { "r13", 13 }, - { "r14", 14 }, - { "r15", 15 }, - { "g0", 16 }, - { "g1", 17 }, - { "g2", 18 }, - { "g3", 19 }, - { "g4", 20 }, - { "g5", 21 }, - { "g6", 22 }, - { "g7", 23 }, - { "g8", 24 }, - { "g9", 25 }, - { "g10", 26 }, - { "g11", 27 }, - { "g12", 28 }, - { "g13", 29 }, - { "g14", 30 }, - { "fp", 31 }, - - /* Numbers for special-function registers are for assembler internal - use only: they are scaled back to range [0-31] for binary output. */ -#define SF0 32 - - { "sf0", 32 }, - { "sf1", 33 }, - { "sf2", 34 }, - { "sf3", 35 }, - { "sf4", 36 }, - { "sf5", 37 }, - { "sf6", 38 }, - { "sf7", 39 }, - { "sf8", 40 }, - { "sf9", 41 }, - { "sf10", 42 }, - { "sf11", 43 }, - { "sf12", 44 }, - { "sf13", 45 }, - { "sf14", 46 }, - { "sf15", 47 }, - { "sf16", 48 }, - { "sf17", 49 }, - { "sf18", 50 }, - { "sf19", 51 }, - { "sf20", 52 }, - { "sf21", 53 }, - { "sf22", 54 }, - { "sf23", 55 }, - { "sf24", 56 }, - { "sf25", 57 }, - { "sf26", 58 }, - { "sf27", 59 }, - { "sf28", 60 }, - { "sf29", 61 }, - { "sf30", 62 }, - { "sf31", 63 }, - - /* Numbers for floating point registers are for assembler internal - use only: they are scaled back to [0-3] for binary output. */ -#define FP0 64 - - { "fp0", 64 }, - { "fp1", 65 }, - { "fp2", 66 }, - { "fp3", 67 }, - - { NULL, 0 }, /* END OF LIST */ -}; - -#define IS_RG_REG(n) ((0 <= (n)) && ((n) < SF0)) -#define IS_SF_REG(n) ((SF0 <= (n)) && ((n) < FP0)) -#define IS_FP_REG(n) ((n) >= FP0) - -/* Number and assembler mnemonic for all registers that can appear as - 'abase' (indirect addressing) registers. */ -static const struct - { - char *areg_name; - int areg_num; - } -aregs[] = -{ - { "(pfp)", 0 }, - { "(sp)", 1 }, - { "(rip)", 2 }, - { "(r3)", 3 }, - { "(r4)", 4 }, - { "(r5)", 5 }, - { "(r6)", 6 }, - { "(r7)", 7 }, - { "(r8)", 8 }, - { "(r9)", 9 }, - { "(r10)", 10 }, - { "(r11)", 11 }, - { "(r12)", 12 }, - { "(r13)", 13 }, - { "(r14)", 14 }, - { "(r15)", 15 }, - { "(g0)", 16 }, - { "(g1)", 17 }, - { "(g2)", 18 }, - { "(g3)", 19 }, - { "(g4)", 20 }, - { "(g5)", 21 }, - { "(g6)", 22 }, - { "(g7)", 23 }, - { "(g8)", 24 }, - { "(g9)", 25 }, - { "(g10)", 26 }, - { "(g11)", 27 }, - { "(g12)", 28 }, - { "(g13)", 29 }, - { "(g14)", 30 }, - { "(fp)", 31 }, - -#define IPREL 32 - /* For assembler internal use only: this number never appears in binary - output. */ - { "(ip)", IPREL }, - - { NULL, 0 }, /* END OF LIST */ -}; - - -/* Hash tables */ -static struct hash_control *op_hash; /* Opcode mnemonics */ -static struct hash_control *reg_hash; /* Register name hash table */ -static struct hash_control *areg_hash; /* Abase register hash table */ - - -/* Architecture for which we are assembling */ -#define ARCH_ANY 0 /* Default: no architecture checking done */ -#define ARCH_KA 1 -#define ARCH_KB 2 -#define ARCH_MC 3 -#define ARCH_CA 4 -#define ARCH_JX 5 -#define ARCH_HX 6 -int architecture = ARCH_ANY; /* Architecture requested on invocation line */ -int iclasses_seen; /* OR of instruction classes (I_* constants) - * for which we've actually assembled - * instructions. - */ - - -/* BRANCH-PREDICTION INSTRUMENTATION - - The following supports generation of branch-prediction instrumentation - (turned on by -b switch). The instrumentation collects counts - of branches taken/not-taken for later input to a utility that will - set the branch prediction bits of the instructions in accordance with - the behavior observed. (Note that the KX series does not have - brach-prediction.) - - The instrumentation consists of: - - (1) before and after each conditional branch, a call to an external - routine that increments and steps over an inline counter. The - counter itself, initialized to 0, immediately follows the call - instruction. For each branch, the counter following the branch - is the number of times the branch was not taken, and the difference - between the counters is the number of times it was taken. An - example of an instrumented conditional branch: - - call BR_CNT_FUNC - .word 0 - LBRANCH23: be label - call BR_CNT_FUNC - .word 0 - - (2) a table of pointers to the instrumented branches, so that an - external postprocessing routine can locate all of the counters. - the table begins with a 2-word header: a pointer to the next in - a linked list of such tables (initialized to 0); and a count - of the number of entries in the table (exclusive of the header. - - Note that input source code is expected to already contain calls - an external routine that will link the branch local table into a - list of such tables. - */ - -/* Number of branches instrumented so far. Also used to generate - unique local labels for each instrumented branch. */ -static int br_cnt; - -#define BR_LABEL_BASE "LBRANCH" -/* Basename of local labels on instrumented branches, to avoid - conflict with compiler- generated local labels. */ - -#define BR_CNT_FUNC "__inc_branch" -/* Name of the external routine that will increment (and step over) an - inline counter. */ - -#define BR_TAB_NAME "__BRANCH_TABLE__" -/* Name of the table of pointers to branches. A local (i.e., - non-external) symbol. */ - -/***************************************************************************** - md_begin: One-time initialization. - - Set up hash tables. - - *************************************************************************** */ -void -md_begin () -{ - int i; /* Loop counter */ - const struct i960_opcode *oP; /* Pointer into opcode table */ - const char *retval; /* Value returned by hash functions */ - - op_hash = hash_new (); - reg_hash = hash_new (); - areg_hash = hash_new (); - - /* For some reason, the base assembler uses an empty string for "no - error message", instead of a NULL pointer. */ - retval = 0; - - for (oP = i960_opcodes; oP->name && !retval; oP++) - retval = hash_insert (op_hash, oP->name, (PTR) oP); - - for (i = 0; regnames[i].reg_name && !retval; i++) - retval = hash_insert (reg_hash, regnames[i].reg_name, - (char *) ®names[i].reg_num); - - for (i = 0; aregs[i].areg_name && !retval; i++) - retval = hash_insert (areg_hash, aregs[i].areg_name, - (char *) &aregs[i].areg_num); - - if (retval) - as_fatal (_("Hashing returned \"%s\"."), retval); -} - -/***************************************************************************** - md_assemble: Assemble an instruction - - Assumptions about the passed-in text: - - all comments, labels removed - - text is an instruction - - all white space compressed to single blanks - - all character constants have been replaced with decimal - - *************************************************************************** */ -void -md_assemble (textP) - char *textP; /* Source text of instruction */ -{ - /* Parsed instruction text, containing NO whitespace: arg[0]->opcode - mnemonic arg[1-3]->operands, with char constants replaced by - decimal numbers. */ - char *args[4]; - - int n_ops; /* Number of instruction operands */ - /* Pointer to instruction description */ - struct i960_opcode *oP; - /* TRUE iff opcode mnemonic included branch-prediction suffix (".f" - or ".t"). */ - int branch_predict; - /* Setting of branch-prediction bit(s) to be OR'd into instruction - opcode of CTRL/COBR format instructions. */ - long bp_bits; - - int n; /* Offset of last character in opcode mnemonic */ - - const char *bp_error_msg = _("branch prediction invalid on this opcode"); - - - /* Parse instruction into opcode and operands */ - memset (args, '\0', sizeof (args)); - n_ops = i_scan (textP, args); - if (n_ops == -1) - { - return; /* Error message already issued */ - } - - /* Do "macro substitution" (sort of) on 'ldconst' pseudo-instruction */ - if (!strcmp (args[0], "ldconst")) - { - n_ops = parse_ldconst (args); - if (n_ops == -1) - { - return; - } - } - - - - /* Check for branch-prediction suffix on opcode mnemonic, strip it off */ - n = strlen (args[0]) - 1; - branch_predict = 0; - bp_bits = 0; - if (args[0][n - 1] == '.' && (args[0][n] == 't' || args[0][n] == 'f')) - { - /* We could check here to see if the target architecture - supports branch prediction, but why bother? The bit will - just be ignored by processors that don't use it. */ - branch_predict = 1; - bp_bits = (args[0][n] == 't') ? BP_TAKEN : BP_NOT_TAKEN; - args[0][n - 1] = '\0'; /* Strip suffix from opcode mnemonic */ - } - - /* Look up opcode mnemonic in table and check number of operands. - Check that opcode is legal for the target architecture. If all - looks good, assemble instruction. */ - oP = (struct i960_opcode *) hash_find (op_hash, args[0]); - if (!oP || !targ_has_iclass (oP->iclass)) - { - as_bad (_("invalid opcode, \"%s\"."), args[0]); - - } - else if (n_ops != oP->num_ops) - { - as_bad (_("improper number of operands. expecting %d, got %d"), - oP->num_ops, n_ops); - } - else - { - switch (oP->format) - { - case FBRA: - case CTRL: - ctrl_fmt (args[1], oP->opcode | bp_bits, oP->num_ops); - if (oP->format == FBRA) - { - /* Now generate a 'bno' to same arg */ - ctrl_fmt (args[1], BNO | bp_bits, 1); - } - break; - case COBR: - case COJ: - cobr_fmt (args, oP->opcode | bp_bits, oP); - break; - case REG: - if (branch_predict) - { - as_warn (bp_error_msg); - } - reg_fmt (args, oP); - break; - case MEM1: - if (args[0][0] == 'c' && args[0][1] == 'a') - { - if (branch_predict) - { - as_warn (bp_error_msg); - } - mem_fmt (args, oP, 1); - break; - } - case MEM2: - case MEM4: - case MEM8: - case MEM12: - case MEM16: - if (branch_predict) - { - as_warn (bp_error_msg); - } - mem_fmt (args, oP, 0); - break; - case CALLJ: - if (branch_predict) - { - as_warn (bp_error_msg); - } - /* Output opcode & set up "fixup" (relocation); flag - relocation as 'callj' type. */ - know (oP->num_ops == 1); - get_cdisp (args[1], "CTRL", oP->opcode, 24, 0, 1); - break; - default: - BAD_CASE (oP->format); - break; - } - } -} /* md_assemble() */ - -/***************************************************************************** - md_number_to_chars: convert a number to target byte order - - *************************************************************************** */ -void -md_number_to_chars (buf, value, n) - char *buf; - valueT value; - int n; -{ - number_to_chars_littleendian (buf, value, n); -} - -/***************************************************************************** - md_chars_to_number: convert from target byte order to host byte order. - - *************************************************************************** */ -int -md_chars_to_number (val, n) - unsigned char *val; /* Value in target byte order */ - int n; /* Number of bytes in the input */ -{ - int retval; - - for (retval = 0; n--;) - { - retval <<= 8; - retval |= val[n]; - } - return retval; -} - - -#define MAX_LITTLENUMS 6 -#define LNUM_SIZE sizeof(LITTLENUM_TYPE) - -/***************************************************************************** - md_atof: convert ascii to floating point - - Turn a string at input_line_pointer into a floating point constant of type - 'type', and store the appropriate bytes at *litP. The number of LITTLENUMS - emitted is returned at 'sizeP'. An error message is returned, or a pointer - to an empty message if OK. - - Note we call the i386 floating point routine, rather than complicating - things with more files or symbolic links. - - *************************************************************************** */ -char * -md_atof (type, litP, sizeP) - int type; - char *litP; - int *sizeP; -{ - LITTLENUM_TYPE words[MAX_LITTLENUMS]; - LITTLENUM_TYPE *wordP; - int prec; - char *t; - char *atof_ieee (); - - switch (type) - { - case 'f': - case 'F': - prec = 2; - break; - - case 'd': - case 'D': - prec = 4; - break; - - case 't': - case 'T': - prec = 5; - type = 'x'; /* That's what atof_ieee() understands */ - break; - - default: - *sizeP = 0; - return _("Bad call to md_atof()"); - } - - t = atof_ieee (input_line_pointer, type, words); - if (t) - { - input_line_pointer = t; - } - - *sizeP = prec * LNUM_SIZE; - - /* Output the LITTLENUMs in REVERSE order in accord with i80960 - word-order. (Dunno why atof_ieee doesn't do it in the right - order in the first place -- probably because it's a hack of - atof_m68k.) */ - - for (wordP = words + prec - 1; prec--;) - { - md_number_to_chars (litP, (long) (*wordP--), LNUM_SIZE); - litP += sizeof (LITTLENUM_TYPE); - } - - return 0; -} - - -/***************************************************************************** - md_number_to_imm - - *************************************************************************** */ -void -md_number_to_imm (buf, val, n) - char *buf; - long val; - int n; -{ - md_number_to_chars (buf, val, n); -} - - -/***************************************************************************** - md_number_to_disp - - *************************************************************************** */ -void -md_number_to_disp (buf, val, n) - char *buf; - long val; - int n; -{ - md_number_to_chars (buf, val, n); -} - -/***************************************************************************** - md_number_to_field: - - Stick a value (an address fixup) into a bit field of - previously-generated instruction. - - *************************************************************************** */ -void -md_number_to_field (instrP, val, bfixP) - char *instrP; /* Pointer to instruction to be fixed */ - long val; /* Address fixup value */ - bit_fixS *bfixP; /* Description of bit field to be fixed up */ -{ - int numbits; /* Length of bit field to be fixed */ - long instr; /* 32-bit instruction to be fixed-up */ - long sign; /* 0 or -1, according to sign bit of 'val' */ - - /* Convert instruction back to host byte order. */ - instr = md_chars_to_number (instrP, 4); - - /* Surprise! -- we stored the number of bits to be modified rather - than a pointer to a structure. */ - numbits = (int) bfixP; - if (numbits == 1) - { - /* This is a no-op, stuck here by reloc_callj() */ - return; - } - - know ((numbits == 13) || (numbits == 24)); - - /* Propagate sign bit of 'val' for the given number of bits. Result - should be all 0 or all 1. */ - sign = val >> ((int) numbits - 1); - if (((val < 0) && (sign != -1)) - || ((val > 0) && (sign != 0))) - { - as_bad (_("Fixup of %ld too large for field width of %d"), - val, numbits); - } - else - { - /* Put bit field into instruction and write back in target - * byte order. - */ - val &= ~(-1 << (int) numbits); /* Clear unused sign bits */ - instr |= val; - md_number_to_chars (instrP, instr, 4); - } -} /* md_number_to_field() */ - - -/***************************************************************************** - md_parse_option - Invocation line includes a switch not recognized by the base assembler. - See if it's a processor-specific option. For the 960, these are: - - -norelax: - Conditional branch instructions that require displacements - greater than 13 bits (or that have external targets) should - generate errors. The default is to replace each such - instruction with the corresponding compare (or chkbit) and - branch instructions. Note that the Intel "j" cobr directives - are ALWAYS "de-optimized" in this way when necessary, - regardless of the setting of this option. - - -b: - Add code to collect information about branches taken, for - later optimization of branch prediction bits by a separate - tool. COBR and CNTL format instructions have branch - prediction bits (in the CX architecture); if "BR" represents - an instruction in one of these classes, the following rep- - resents the code generated by the assembler: - - call <increment routine> - .word 0 # pre-counter - Label: BR - call <increment routine> - .word 0 # post-counter - - A table of all such "Labels" is also generated. - - - -AKA, -AKB, -AKC, -ASA, -ASB, -AMC, -ACA: - Select the 80960 architecture. Instructions or features not - supported by the selected architecture cause fatal errors. - The default is to generate code for any instruction or feature - that is supported by SOME version of the 960 (even if this - means mixing architectures!). - - ****************************************************************************/ - -CONST char *md_shortopts = "A:b"; -struct option md_longopts[] = -{ -#define OPTION_LINKRELAX (OPTION_MD_BASE) - {"linkrelax", no_argument, NULL, OPTION_LINKRELAX}, - {"link-relax", no_argument, NULL, OPTION_LINKRELAX}, -#define OPTION_NORELAX (OPTION_MD_BASE + 1) - {"norelax", no_argument, NULL, OPTION_NORELAX}, - {"no-relax", no_argument, NULL, OPTION_NORELAX}, - {NULL, no_argument, NULL, 0} -}; -size_t md_longopts_size = sizeof (md_longopts); - -struct tabentry - { - char *flag; - int arch; - }; -static const struct tabentry arch_tab[] = -{ - {"KA", ARCH_KA}, - {"KB", ARCH_KB}, - {"SA", ARCH_KA}, /* Synonym for KA */ - {"SB", ARCH_KB}, /* Synonym for KB */ - {"KC", ARCH_MC}, /* Synonym for MC */ - {"MC", ARCH_MC}, - {"CA", ARCH_CA}, - {"JX", ARCH_JX}, - {"HX", ARCH_HX}, - {NULL, 0} -}; - -int -md_parse_option (c, arg) - int c; - char *arg; -{ - switch (c) - { - case OPTION_LINKRELAX: - linkrelax = 1; - flag_keep_locals = 1; - break; - - case OPTION_NORELAX: - norelax = 1; - break; - - case 'b': - instrument_branches = 1; - break; - - case 'A': - { - const struct tabentry *tp; - char *p = arg; - - for (tp = arch_tab; tp->flag != NULL; tp++) - if (!strcmp (p, tp->flag)) - break; - - if (tp->flag == NULL) - { - as_bad (_("invalid architecture %s"), p); - return 0; - } - else - architecture = tp->arch; - } - break; - - default: - return 0; - } - - return 1; -} - -void -md_show_usage (stream) - FILE *stream; -{ - int i; - fprintf (stream, _("I960 options:\n")); - for (i = 0; arch_tab[i].flag; i++) - fprintf (stream, "%s-A%s", i ? " | " : "", arch_tab[i].flag); - fprintf (stream, _("\n\ - specify variant of 960 architecture\n\ --b add code to collect statistics about branches taken\n\ --link-relax preserve individual alignment directives so linker\n\ - can do relaxing (b.out format only)\n\ --no-relax don't alter compare-and-branch instructions for\n\ - long displacements\n")); -} - - -/***************************************************************************** - md_convert_frag: - Called by base assembler after address relaxation is finished: modify - variable fragments according to how much relaxation was done. - - If the fragment substate is still 1, a 13-bit displacement was enough - to reach the symbol in question. Set up an address fixup, but otherwise - leave the cobr instruction alone. - - If the fragment substate is 2, a 13-bit displacement was not enough. - Replace the cobr with a two instructions (a compare and a branch). - - *************************************************************************** */ -#ifndef BFD_ASSEMBLER -void -md_convert_frag (headers, seg, fragP) - object_headers *headers; - segT seg; - fragS *fragP; -#else -void -md_convert_frag (abfd, sec, fragP) - bfd *abfd; - segT sec; - fragS *fragP; -#endif -{ - fixS *fixP; /* Structure describing needed address fix */ - - switch (fragP->fr_subtype) - { - case 1: - /* LEAVE SINGLE COBR INSTRUCTION */ - fixP = fix_new (fragP, - fragP->fr_opcode - fragP->fr_literal, - 4, - fragP->fr_symbol, - fragP->fr_offset, - 1, - NO_RELOC); - - fixP->fx_bit_fixP = (bit_fixS *) 13; /* size of bit field */ - break; - case 2: - /* REPLACE COBR WITH COMPARE/BRANCH INSTRUCTIONS */ - relax_cobr (fragP); - break; - default: - BAD_CASE (fragP->fr_subtype); - break; - } -} - -/***************************************************************************** - md_estimate_size_before_relax: How much does it look like *fragP will grow? - - Called by base assembler just before address relaxation. - Return the amount by which the fragment will grow. - - Any symbol that is now undefined will not become defined; cobr's - based on undefined symbols will have to be replaced with a compare - instruction and a branch instruction, and the code fragment will grow - by 4 bytes. - - *************************************************************************** */ -int -md_estimate_size_before_relax (fragP, segment_type) - register fragS *fragP; - register segT segment_type; -{ - /* If symbol is undefined in this segment, go to "relaxed" state - (compare and branch instructions instead of cobr) right now. */ - if (S_GET_SEGMENT (fragP->fr_symbol) != segment_type) - { - relax_cobr (fragP); - return 4; - } - return 0; -} /* md_estimate_size_before_relax() */ - -#if defined(OBJ_AOUT) | defined(OBJ_BOUT) - -/***************************************************************************** - md_ri_to_chars: - This routine exists in order to overcome machine byte-order problems - when dealing with bit-field entries in the relocation_info struct. - - But relocation info will be used on the host machine only (only - executable code is actually downloaded to the i80960). Therefore, - we leave it in host byte order. - - The above comment is no longer true. This routine now really - does do the reordering (Ian Taylor 28 Aug 92). - - *************************************************************************** */ - -static void -md_ri_to_chars (where, ri) - char *where; - struct relocation_info *ri; -{ - md_number_to_chars (where, ri->r_address, - sizeof (ri->r_address)); - where[4] = ri->r_index & 0x0ff; - where[5] = (ri->r_index >> 8) & 0x0ff; - where[6] = (ri->r_index >> 16) & 0x0ff; - where[7] = ((ri->r_pcrel << 0) - | (ri->r_length << 1) - | (ri->r_extern << 3) - | (ri->r_bsr << 4) - | (ri->r_disp << 5) - | (ri->r_callj << 6)); -} - -#endif /* defined(OBJ_AOUT) | defined(OBJ_BOUT) */ - - -/* FOLLOWING ARE THE LOCAL ROUTINES, IN ALPHABETICAL ORDER */ - -/***************************************************************************** - brcnt_emit: Emit code to increment inline branch counter. - - See the comments above the declaration of 'br_cnt' for details on - branch-prediction instrumentation. - *************************************************************************** */ -static void -brcnt_emit () -{ - ctrl_fmt (BR_CNT_FUNC, CALL, 1); /* Emit call to "increment" routine */ - emit (0); /* Emit inline counter to be incremented */ -} - -/***************************************************************************** - brlab_next: generate the next branch local label - - See the comments above the declaration of 'br_cnt' for details on - branch-prediction instrumentation. - *************************************************************************** */ -static char * -brlab_next () -{ - static char buf[20]; - - sprintf (buf, "%s%d", BR_LABEL_BASE, br_cnt++); - return buf; -} - -/***************************************************************************** - brtab_emit: generate the fetch-prediction branch table. - - See the comments above the declaration of 'br_cnt' for details on - branch-prediction instrumentation. - - The code emitted here would be functionally equivalent to the following - example assembler source. - - .data - .align 2 - BR_TAB_NAME: - .word 0 # link to next table - .word 3 # length of table - .word LBRANCH0 # 1st entry in table proper - .word LBRANCH1 - .word LBRANCH2 - **************************************************************************** */ -void -brtab_emit () -{ - int i; - char buf[20]; - char *p; /* Where the binary was output to */ - /* Pointer to description of deferred address fixup. */ - fixS *fixP; - - if (!instrument_branches) - { - return; - } - - subseg_set (data_section, 0); /* .data */ - frag_align (2, 0, 0); /* .align 2 */ - record_alignment (now_seg, 2); - colon (BR_TAB_NAME); /* BR_TAB_NAME: */ - emit (0); /* .word 0 #link to next table */ - emit (br_cnt); /* .word n #length of table */ - - for (i = 0; i < br_cnt; i++) - { - sprintf (buf, "%s%d", BR_LABEL_BASE, i); - p = emit (0); - fixP = fix_new (frag_now, - p - frag_now->fr_literal, - 4, - symbol_find (buf), - 0, - 0, - NO_RELOC); - } -} - -/***************************************************************************** - cobr_fmt: generate a COBR-format instruction - - *************************************************************************** */ -static -void -cobr_fmt (arg, opcode, oP) - /* arg[0]->opcode mnemonic, arg[1-3]->operands (ascii) */ - char *arg[]; - /* Opcode, with branch-prediction bits already set if necessary. */ - long opcode; - /* Pointer to description of instruction. */ - struct i960_opcode *oP; -{ - long instr; /* 32-bit instruction */ - struct regop regop; /* Description of register operand */ - int n; /* Number of operands */ - int var_frag; /* 1 if varying length code fragment should - * be emitted; 0 if an address fix - * should be emitted. - */ - - instr = opcode; - n = oP->num_ops; - - if (n >= 1) - { - /* First operand (if any) of a COBR is always a register - operand. Parse it. */ - parse_regop (®op, arg[1], oP->operand[0]); - instr |= (regop.n << 19) | (regop.mode << 13); - } - if (n >= 2) - { - /* Second operand (if any) of a COBR is always a register - operand. Parse it. */ - parse_regop (®op, arg[2], oP->operand[1]); - instr |= (regop.n << 14) | regop.special; - } - - - if (n < 3) - { - emit (instr); - - } - else - { - if (instrument_branches) - { - brcnt_emit (); - colon (brlab_next ()); - } - - /* A third operand to a COBR is always a displacement. Parse - it; if it's relaxable (a cobr "j" directive, or any cobr - other than bbs/bbc when the "-norelax" option is not in use) - set up a variable code fragment; otherwise set up an address - fix. */ - var_frag = !norelax || (oP->format == COJ); /* TRUE or FALSE */ - get_cdisp (arg[3], "COBR", instr, 13, var_frag, 0); - - if (instrument_branches) - { - brcnt_emit (); - } - } -} /* cobr_fmt() */ - - -/***************************************************************************** - ctrl_fmt: generate a CTRL-format instruction - - *************************************************************************** */ -static -void -ctrl_fmt (targP, opcode, num_ops) - char *targP; /* Pointer to text of lone operand (if any) */ - long opcode; /* Template of instruction */ - int num_ops; /* Number of operands */ -{ - int instrument; /* TRUE iff we should add instrumentation to track - * how often the branch is taken - */ - - - if (num_ops == 0) - { - emit (opcode); /* Output opcode */ - } - else - { - - instrument = instrument_branches && (opcode != CALL) - && (opcode != B) && (opcode != RET) && (opcode != BAL); - - if (instrument) - { - brcnt_emit (); - colon (brlab_next ()); - } - - /* The operand MUST be an ip-relative displacment. Parse it - * and set up address fix for the instruction we just output. - */ - get_cdisp (targP, "CTRL", opcode, 24, 0, 0); - - if (instrument) - { - brcnt_emit (); - } - } - -} - - -/***************************************************************************** - emit: output instruction binary - - Output instruction binary, in target byte order, 4 bytes at a time. - Return pointer to where it was placed. - - *************************************************************************** */ -static -char * -emit (instr) - long instr; /* Word to be output, host byte order */ -{ - char *toP; /* Where to output it */ - - toP = frag_more (4); /* Allocate storage */ - md_number_to_chars (toP, instr, 4); /* Convert to target byte order */ - return toP; -} - - -/***************************************************************************** - get_args: break individual arguments out of comma-separated list - - Input assumptions: - - all comments and labels have been removed - - all strings of whitespace have been collapsed to a single blank. - - all character constants ('x') have been replaced with decimal - - Output: - args[0] is untouched. args[1] points to first operand, etc. All args: - - are NULL-terminated - - contain no whitespace - - Return value: - Number of operands (0,1,2, or 3) or -1 on error. - - *************************************************************************** */ -static int -get_args (p, args) - /* Pointer to comma-separated operands; MUCKED BY US */ - register char *p; - /* Output arg: pointers to operands placed in args[1-3]. MUST - ACCOMMODATE 4 ENTRIES (args[0-3]). */ - char *args[]; -{ - register int n; /* Number of operands */ - register char *to; - - /* Skip lead white space */ - while (*p == ' ') - { - p++; - } - - if (*p == '\0') - { - return 0; - } - - n = 1; - args[1] = p; - - /* Squeze blanks out by moving non-blanks toward start of string. - * Isolate operands, whenever comma is found. - */ - to = p; - while (*p != '\0') - { - - if (*p == ' ' - && (! isalnum ((unsigned char) p[1]) - || ! isalnum ((unsigned char) p[-1]))) - { - p++; - - } - else if (*p == ',') - { - - /* Start of operand */ - if (n == 3) - { - as_bad (_("too many operands")); - return -1; - } - *to++ = '\0'; /* Terminate argument */ - args[++n] = to; /* Start next argument */ - p++; - - } - else - { - *to++ = *p++; - } - } - *to = '\0'; - return n; -} - - -/***************************************************************************** - get_cdisp: handle displacement for a COBR or CTRL instruction. - - Parse displacement for a COBR or CTRL instruction. - - If successful, output the instruction opcode and set up for it, - depending on the arg 'var_frag', either: - o an address fixup to be done when all symbol values are known, or - o a varying length code fragment, with address fixup info. This - will be done for cobr instructions that may have to be relaxed - in to compare/branch instructions (8 bytes) if the final - address displacement is greater than 13 bits. - - ****************************************************************************/ -static -void -get_cdisp (dispP, ifmtP, instr, numbits, var_frag, callj) - /* displacement as specified in source instruction */ - char *dispP; - /* "COBR" or "CTRL" (for use in error message) */ - char *ifmtP; - /* Instruction needing the displacement */ - long instr; - /* # bits of displacement (13 for COBR, 24 for CTRL) */ - int numbits; - /* 1 if varying length code fragment should be emitted; - * 0 if an address fix should be emitted. - */ - int var_frag; - /* 1 if callj relocation should be done; else 0 */ - int callj; -{ - expressionS e; /* Parsed expression */ - fixS *fixP; /* Structure describing needed address fix */ - char *outP; /* Where instruction binary is output to */ - - fixP = NULL; - - parse_expr (dispP, &e); - switch (e.X_op) - { - case O_illegal: - as_bad (_("expression syntax error")); - - case O_symbol: - if (S_GET_SEGMENT (e.X_add_symbol) == now_seg - || S_GET_SEGMENT (e.X_add_symbol) == undefined_section) - { - if (var_frag) - { - outP = frag_more (8); /* Allocate worst-case storage */ - md_number_to_chars (outP, instr, 4); - frag_variant (rs_machine_dependent, 4, 4, 1, - adds (e), offs (e), outP); - } - else - { - /* Set up a new fix structure, so address can be updated - * when all symbol values are known. - */ - outP = emit (instr); - fixP = fix_new (frag_now, - outP - frag_now->fr_literal, - 4, - adds (e), - offs (e), - 1, - NO_RELOC); - - fixP->fx_tcbit = callj; - - /* We want to modify a bit field when the address is - * known. But we don't need all the garbage in the - * bit_fix structure. So we're going to lie and store - * the number of bits affected instead of a pointer. - */ - fixP->fx_bit_fixP = (bit_fixS *) numbits; - } - } - else - as_bad (_("attempt to branch into different segment")); - break; - - default: - as_bad (_("target of %s instruction must be a label"), ifmtP); - break; - } -} - - -/***************************************************************************** - get_ispec: parse a memory operand for an index specification - - Here, an "index specification" is taken to be anything surrounded - by square brackets and NOT followed by anything else. - - If it's found, detach it from the input string, remove the surrounding - square brackets, and return a pointer to it. Otherwise, return NULL. - - *************************************************************************** */ -static -char * -get_ispec (textP) - /* Pointer to memory operand from source instruction, no white space. */ - char *textP; -{ - /* Points to start of index specification. */ - char *start; - /* Points to end of index specification. */ - char *end; - - /* Find opening square bracket, if any. */ - start = strchr (textP, '['); - - if (start != NULL) - { - - /* Eliminate '[', detach from rest of operand */ - *start++ = '\0'; - - end = strchr (start, ']'); - - if (end == NULL) - { - as_bad (_("unmatched '['")); - - } - else - { - /* Eliminate ']' and make sure it was the last thing - * in the string. - */ - *end = '\0'; - if (*(end + 1) != '\0') - { - as_bad (_("garbage after index spec ignored")); - } - } - } - return start; -} - -/***************************************************************************** - get_regnum: - - Look up a (suspected) register name in the register table and return the - associated register number (or -1 if not found). - - *************************************************************************** */ -static -int -get_regnum (regname) - char *regname; /* Suspected register name */ -{ - int *rP; - - rP = (int *) hash_find (reg_hash, regname); - return (rP == NULL) ? -1 : *rP; -} - - -/***************************************************************************** - i_scan: perform lexical scan of ascii assembler instruction. - - Input assumptions: - - input string is an i80960 instruction (not a pseudo-op) - - all comments and labels have been removed - - all strings of whitespace have been collapsed to a single blank. - - Output: - args[0] points to opcode, other entries point to operands. All strings: - - are NULL-terminated - - contain no whitespace - - have character constants ('x') replaced with a decimal number - - Return value: - Number of operands (0,1,2, or 3) or -1 on error. - - *************************************************************************** */ -static int -i_scan (iP, args) - /* Pointer to ascii instruction; MUCKED BY US. */ - register char *iP; - /* Output arg: pointers to opcode and operands placed here. MUST - ACCOMMODATE 4 ENTRIES. */ - char *args[]; -{ - - /* Isolate opcode */ - if (*(iP) == ' ') - { - iP++; - } /* Skip lead space, if any */ - args[0] = iP; - for (; *iP != ' '; iP++) - { - if (*iP == '\0') - { - /* There are no operands */ - if (args[0] == iP) - { - /* We never moved: there was no opcode either! */ - as_bad (_("missing opcode")); - return -1; - } - return 0; - } - } - *iP++ = '\0'; /* Terminate opcode */ - return (get_args (iP, args)); -} /* i_scan() */ - - -/***************************************************************************** - mem_fmt: generate a MEMA- or MEMB-format instruction - - *************************************************************************** */ -static void -mem_fmt (args, oP, callx) - char *args[]; /* args[0]->opcode mnemonic, args[1-3]->operands */ - struct i960_opcode *oP; /* Pointer to description of instruction */ - int callx; /* Is this a callx opcode */ -{ - int i; /* Loop counter */ - struct regop regop; /* Description of register operand */ - char opdesc; /* Operand descriptor byte */ - memS instr; /* Description of binary to be output */ - char *outP; /* Where the binary was output to */ - expressionS expr; /* Parsed expression */ - /* ->description of deferred address fixup */ - fixS *fixP; - -#ifdef OBJ_COFF - /* COFF support isn't in place yet for callx relaxing. */ - callx = 0; -#endif - - memset (&instr, '\0', sizeof (memS)); - instr.opcode = oP->opcode; - - /* Process operands. */ - for (i = 1; i <= oP->num_ops; i++) - { - opdesc = oP->operand[i - 1]; - - if (MEMOP (opdesc)) - { - parse_memop (&instr, args[i], oP->format); - } - else - { - parse_regop (®op, args[i], opdesc); - instr.opcode |= regop.n << 19; - } - } - - /* Parse the displacement; this must be done before emitting the - opcode, in case it is an expression using `.'. */ - parse_expr (instr.e, &expr); - - /* Output opcode */ - outP = emit (instr.opcode); - - if (instr.disp == 0) - { - return; - } - - /* Process the displacement */ - switch (expr.X_op) - { - case O_illegal: - as_bad (_("expression syntax error")); - break; - - case O_constant: - if (instr.disp == 32) - { - (void) emit (offs (expr)); /* Output displacement */ - } - else - { - /* 12-bit displacement */ - if (offs (expr) & ~0xfff) - { - /* Won't fit in 12 bits: convert already-output - * instruction to MEMB format, output - * displacement. - */ - mema_to_memb (outP); - (void) emit (offs (expr)); - } - else - { - /* WILL fit in 12 bits: OR into opcode and - * overwrite the binary we already put out - */ - instr.opcode |= offs (expr); - md_number_to_chars (outP, instr.opcode, 4); - } - } - break; - - default: - if (instr.disp == 12) - { - /* Displacement is dependent on a symbol, whose value - * may change at link time. We HAVE to reserve 32 bits. - * Convert already-output opcode to MEMB format. - */ - mema_to_memb (outP); - } - - /* Output 0 displacement and set up address fixup for when - * this symbol's value becomes known. - */ - outP = emit ((long) 0); - fixP = fix_new_exp (frag_now, - outP - frag_now->fr_literal, - 4, - &expr, - 0, - NO_RELOC); - /* Steve's linker relaxing hack. Mark this 32-bit relocation as - being in the instruction stream, specifically as part of a callx - instruction. */ - fixP->fx_bsr = callx; - break; - } -} /* memfmt() */ - - -/***************************************************************************** - mema_to_memb: convert a MEMA-format opcode to a MEMB-format opcode. - - There are 2 possible MEMA formats: - - displacement only - - displacement + abase - - They are distinguished by the setting of the MEMA_ABASE bit. - - *************************************************************************** */ -static void -mema_to_memb (opcodeP) - char *opcodeP; /* Where to find the opcode, in target byte order */ -{ - long opcode; /* Opcode in host byte order */ - long mode; /* Mode bits for MEMB instruction */ - - opcode = md_chars_to_number (opcodeP, 4); - know (!(opcode & MEMB_BIT)); - - mode = MEMB_BIT | D_BIT; - if (opcode & MEMA_ABASE) - { - mode |= A_BIT; - } - - opcode &= 0xffffc000; /* Clear MEMA offset and mode bits */ - opcode |= mode; /* Set MEMB mode bits */ - - md_number_to_chars (opcodeP, opcode, 4); -} /* mema_to_memb() */ - - -/***************************************************************************** - parse_expr: parse an expression - - Use base assembler's expression parser to parse an expression. - It, unfortunately, runs off a global which we have to save/restore - in order to make it work for us. - - An empty expression string is treated as an absolute 0. - - Sets O_illegal regardless of expression evaluation if entire input - string is not consumed in the evaluation -- tolerate no dangling junk! - - *************************************************************************** */ -static void -parse_expr (textP, expP) - char *textP; /* Text of expression to be parsed */ - expressionS *expP; /* Where to put the results of parsing */ -{ - char *save_in; /* Save global here */ - symbolS *symP; - - know (textP); - - if (*textP == '\0') - { - /* Treat empty string as absolute 0 */ - expP->X_add_symbol = expP->X_op_symbol = NULL; - expP->X_add_number = 0; - expP->X_op = O_constant; - } - else - { - save_in = input_line_pointer; /* Save global */ - input_line_pointer = textP; /* Make parser work for us */ - - (void) expression (expP); - if ((size_t) (input_line_pointer - textP) != strlen (textP)) - { - /* Did not consume all of the input */ - expP->X_op = O_illegal; - } - symP = expP->X_add_symbol; - if (symP && (hash_find (reg_hash, S_GET_NAME (symP)))) - { - /* Register name in an expression */ - /* FIXME: this isn't much of a check any more. */ - expP->X_op = O_illegal; - } - - input_line_pointer = save_in; /* Restore global */ - } -} - - -/***************************************************************************** - parse_ldcont: - Parse and replace a 'ldconst' pseudo-instruction with an appropriate - i80960 instruction. - - Assumes the input consists of: - arg[0] opcode mnemonic ('ldconst') - arg[1] first operand (constant) - arg[2] name of register to be loaded - - Replaces opcode and/or operands as appropriate. - - Returns the new number of arguments, or -1 on failure. - - *************************************************************************** */ -static -int -parse_ldconst (arg) - char *arg[]; /* See above */ -{ - int n; /* Constant to be loaded */ - int shift; /* Shift count for "shlo" instruction */ - static char buf[5]; /* Literal for first operand */ - static char buf2[5]; /* Literal for second operand */ - expressionS e; /* Parsed expression */ - - - arg[3] = NULL; /* So we can tell at the end if it got used or not */ - - parse_expr (arg[1], &e); - switch (e.X_op) - { - default: - /* We're dependent on one or more symbols -- use "lda" */ - arg[0] = "lda"; - break; - - case O_constant: - /* Try the following mappings: - * ldconst 0,<reg> ->mov 0,<reg> - * ldconst 31,<reg> ->mov 31,<reg> - * ldconst 32,<reg> ->addo 1,31,<reg> - * ldconst 62,<reg> ->addo 31,31,<reg> - * ldconst 64,<reg> ->shlo 8,3,<reg> - * ldconst -1,<reg> ->subo 1,0,<reg> - * ldconst -31,<reg>->subo 31,0,<reg> - * - * anthing else becomes: - * lda xxx,<reg> - */ - n = offs (e); - if ((0 <= n) && (n <= 31)) - { - arg[0] = "mov"; - - } - else if ((-31 <= n) && (n <= -1)) - { - arg[0] = "subo"; - arg[3] = arg[2]; - sprintf (buf, "%d", -n); - arg[1] = buf; - arg[2] = "0"; - - } - else if ((32 <= n) && (n <= 62)) - { - arg[0] = "addo"; - arg[3] = arg[2]; - arg[1] = "31"; - sprintf (buf, "%d", n - 31); - arg[2] = buf; - - } - else if ((shift = shift_ok (n)) != 0) - { - arg[0] = "shlo"; - arg[3] = arg[2]; - sprintf (buf, "%d", shift); - arg[1] = buf; - sprintf (buf2, "%d", n >> shift); - arg[2] = buf2; - - } - else - { - arg[0] = "lda"; - } - break; - - case O_illegal: - as_bad (_("invalid constant")); - return -1; - break; - } - return (arg[3] == 0) ? 2 : 3; -} - -/***************************************************************************** - parse_memop: parse a memory operand - - This routine is based on the observation that the 4 mode bits of the - MEMB format, taken individually, have fairly consistent meaning: - - M3 (bit 13): 1 if displacement is present (D_BIT) - M2 (bit 12): 1 for MEMB instructions (MEMB_BIT) - M1 (bit 11): 1 if index is present (I_BIT) - M0 (bit 10): 1 if abase is present (A_BIT) - - So we parse the memory operand and set bits in the mode as we find - things. Then at the end, if we go to MEMB format, we need only set - the MEMB bit (M2) and our mode is built for us. - - Unfortunately, I said "fairly consistent". The exceptions: - - DBIA - 0100 Would seem illegal, but means "abase-only". - - 0101 Would seem to mean "abase-only" -- it means IP-relative. - Must be converted to 0100. - - 0110 Would seem to mean "index-only", but is reserved. - We turn on the D bit and provide a 0 displacement. - - The other thing to observe is that we parse from the right, peeling - things * off as we go: first any index spec, then any abase, then - the displacement. - - *************************************************************************** */ -static -void -parse_memop (memP, argP, optype) - memS *memP; /* Where to put the results */ - char *argP; /* Text of the operand to be parsed */ - int optype; /* MEM1, MEM2, MEM4, MEM8, MEM12, or MEM16 */ -{ - char *indexP; /* Pointer to index specification with "[]" removed */ - char *p; /* Temp char pointer */ - char iprel_flag; /* True if this is an IP-relative operand */ - int regnum; /* Register number */ - /* Scale factor: 1,2,4,8, or 16. Later converted to internal format - (0,1,2,3,4 respectively). */ - int scale; - int mode; /* MEMB mode bits */ - int *intP; /* Pointer to register number */ - - /* The following table contains the default scale factors for each - type of memory instruction. It is accessed using (optype-MEM1) - as an index -- thus it assumes the 'optype' constants are - assigned consecutive values, in the order they appear in this - table. */ - static const int def_scale[] = - { - 1, /* MEM1 */ - 2, /* MEM2 */ - 4, /* MEM4 */ - 8, /* MEM8 */ - -1, /* MEM12 -- no valid default */ - 16 /* MEM16 */ - }; - - - iprel_flag = mode = 0; - - /* Any index present? */ - indexP = get_ispec (argP); - if (indexP) - { - p = strchr (indexP, '*'); - if (p == NULL) - { - /* No explicit scale -- use default for this instruction - type and assembler mode. */ - if (flag_mri) - scale = 1; - else - /* GNU960 compatibility */ - scale = def_scale[optype - MEM1]; - } - else - { - *p++ = '\0'; /* Eliminate '*' */ - - /* Now indexP->a '\0'-terminated register name, - * and p->a scale factor. - */ - - if (!strcmp (p, "16")) - { - scale = 16; - } - else if (strchr ("1248", *p) && (p[1] == '\0')) - { - scale = *p - '0'; - } - else - { - scale = -1; - } - } - - regnum = get_regnum (indexP); /* Get index reg. # */ - if (!IS_RG_REG (regnum)) - { - as_bad (_("invalid index register")); - return; - } - - /* Convert scale to its binary encoding */ - switch (scale) - { - case 1: - scale = 0 << 7; - break; - case 2: - scale = 1 << 7; - break; - case 4: - scale = 2 << 7; - break; - case 8: - scale = 3 << 7; - break; - case 16: - scale = 4 << 7; - break; - default: - as_bad (_("invalid scale factor")); - return; - }; - - memP->opcode |= scale | regnum; /* Set index bits in opcode */ - mode |= I_BIT; /* Found a valid index spec */ - } - - /* Any abase (Register Indirect) specification present? */ - if ((p = strrchr (argP, '(')) != NULL) - { - /* "(" is there -- does it start a legal abase spec? If not, it - could be part of a displacement expression. */ - intP = (int *) hash_find (areg_hash, p); - if (intP != NULL) - { - /* Got an abase here */ - regnum = *intP; - *p = '\0'; /* discard register spec */ - if (regnum == IPREL) - { - /* We have to specialcase ip-rel mode */ - iprel_flag = 1; - } - else - { - memP->opcode |= regnum << 14; - mode |= A_BIT; - } - } - } - - /* Any expression present? */ - memP->e = argP; - if (*argP != '\0') - { - mode |= D_BIT; - } - - /* Special-case ip-relative addressing */ - if (iprel_flag) - { - if (mode & I_BIT) - { - syntax (); - } - else - { - memP->opcode |= 5 << 10; /* IP-relative mode */ - memP->disp = 32; - } - return; - } - - /* Handle all other modes */ - switch (mode) - { - case D_BIT | A_BIT: - /* Go with MEMA instruction format for now (grow to MEMB later - if 12 bits is not enough for the displacement). MEMA format - has a single mode bit: set it to indicate that abase is - present. */ - memP->opcode |= MEMA_ABASE; - memP->disp = 12; - break; - - case D_BIT: - /* Go with MEMA instruction format for now (grow to MEMB later - if 12 bits is not enough for the displacement). */ - memP->disp = 12; - break; - - case A_BIT: - /* For some reason, the bit string for this mode is not - consistent: it should be 0 (exclusive of the MEMB bit), so we - set it "by hand" here. */ - memP->opcode |= MEMB_BIT; - break; - - case A_BIT | I_BIT: - /* set MEMB bit in mode, and OR in mode bits */ - memP->opcode |= mode | MEMB_BIT; - break; - - case I_BIT: - /* Treat missing displacement as displacement of 0. */ - mode |= D_BIT; - /* Fall into next case. */ - case D_BIT | A_BIT | I_BIT: - case D_BIT | I_BIT: - /* set MEMB bit in mode, and OR in mode bits */ - memP->opcode |= mode | MEMB_BIT; - memP->disp = 32; - break; - - default: - syntax (); - break; - } -} - -/***************************************************************************** - parse_po: parse machine-dependent pseudo-op - - This is a top-level routine for machine-dependent pseudo-ops. It slurps - up the rest of the input line, breaks out the individual arguments, - and dispatches them to the correct handler. - *************************************************************************** */ -static -void -parse_po (po_num) - int po_num; /* Pseudo-op number: currently S_LEAFPROC or S_SYSPROC */ -{ - /* Pointers operands, with no embedded whitespace. - arg[0] unused, arg[1-3]->operands */ - char *args[4]; - int n_ops; /* Number of operands */ - char *p; /* Pointer to beginning of unparsed argument string */ - char eol; /* Character that indicated end of line */ - - extern char is_end_of_line[]; - - /* Advance input pointer to end of line. */ - p = input_line_pointer; - while (!is_end_of_line[(unsigned char) *input_line_pointer]) - { - input_line_pointer++; - } - eol = *input_line_pointer; /* Save end-of-line char */ - *input_line_pointer = '\0'; /* Terminate argument list */ - - /* Parse out operands */ - n_ops = get_args (p, args); - if (n_ops == -1) - { - return; - } - - /* Dispatch to correct handler */ - switch (po_num) - { - case S_SYSPROC: - s_sysproc (n_ops, args); - break; - case S_LEAFPROC: - s_leafproc (n_ops, args); - break; - default: - BAD_CASE (po_num); - break; - } - - /* Restore eol, so line numbers get updated correctly. Base - assembler assumes we leave input pointer pointing at char - following the eol. */ - *input_line_pointer++ = eol; -} - -/***************************************************************************** - parse_regop: parse a register operand. - - In case of illegal operand, issue a message and return some valid - information so instruction processing can continue. - *************************************************************************** */ -static -void -parse_regop (regopP, optext, opdesc) - struct regop *regopP; /* Where to put description of register operand */ - char *optext; /* Text of operand */ - char opdesc; /* Descriptor byte: what's legal for this operand */ -{ - int n; /* Register number */ - expressionS e; /* Parsed expression */ - - /* See if operand is a register */ - n = get_regnum (optext); - if (n >= 0) - { - if (IS_RG_REG (n)) - { - /* global or local register */ - if (!REG_ALIGN (opdesc, n)) - { - as_bad (_("unaligned register")); - } - regopP->n = n; - regopP->mode = 0; - regopP->special = 0; - return; - } - else if (IS_FP_REG (n) && FP_OK (opdesc)) - { - /* Floating point register, and it's allowed */ - regopP->n = n - FP0; - regopP->mode = 1; - regopP->special = 0; - return; - } - else if (IS_SF_REG (n) && SFR_OK (opdesc)) - { - /* Special-function register, and it's allowed */ - regopP->n = n - SF0; - regopP->mode = 0; - regopP->special = 1; - if (!targ_has_sfr (regopP->n)) - { - as_bad (_("no such sfr in this architecture")); - } - return; - } - } - else if (LIT_OK (opdesc)) - { - /* How about a literal? */ - regopP->mode = 1; - regopP->special = 0; - if (FP_OK (opdesc)) - { /* floating point literal acceptable */ - /* Skip over 0f, 0d, or 0e prefix */ - if ((optext[0] == '0') - && (optext[1] >= 'd') - && (optext[1] <= 'f')) - { - optext += 2; - } - - if (!strcmp (optext, "0.0") || !strcmp (optext, "0")) - { - regopP->n = 0x10; - return; - } - if (!strcmp (optext, "1.0") || !strcmp (optext, "1")) - { - regopP->n = 0x16; - return; - } - - } - else - { /* fixed point literal acceptable */ - parse_expr (optext, &e); - if (e.X_op != O_constant - || (offs (e) < 0) || (offs (e) > 31)) - { - as_bad (_("illegal literal")); - offs (e) = 0; - } - regopP->n = offs (e); - return; - } - } - - /* Nothing worked */ - syntax (); - regopP->mode = 0; /* Register r0 is always a good one */ - regopP->n = 0; - regopP->special = 0; -} /* parse_regop() */ - -/***************************************************************************** - reg_fmt: generate a REG-format instruction - - *************************************************************************** */ -static void -reg_fmt (args, oP) - char *args[]; /* args[0]->opcode mnemonic, args[1-3]->operands */ - struct i960_opcode *oP; /* Pointer to description of instruction */ -{ - long instr; /* Binary to be output */ - struct regop regop; /* Description of register operand */ - int n_ops; /* Number of operands */ - - - instr = oP->opcode; - n_ops = oP->num_ops; - - if (n_ops >= 1) - { - parse_regop (®op, args[1], oP->operand[0]); - - if ((n_ops == 1) && !(instr & M3)) - { - /* 1-operand instruction in which the dst field should - * be used (instead of src1). - */ - regop.n <<= 19; - if (regop.special) - { - regop.mode = regop.special; - } - regop.mode <<= 13; - regop.special = 0; - } - else - { - /* regop.n goes in bit 0, needs no shifting */ - regop.mode <<= 11; - regop.special <<= 5; - } - instr |= regop.n | regop.mode | regop.special; - } - - if (n_ops >= 2) - { - parse_regop (®op, args[2], oP->operand[1]); - - if ((n_ops == 2) && !(instr & M3)) - { - /* 2-operand instruction in which the dst field should - * be used instead of src2). - */ - regop.n <<= 19; - if (regop.special) - { - regop.mode = regop.special; - } - regop.mode <<= 13; - regop.special = 0; - } - else - { - regop.n <<= 14; - regop.mode <<= 12; - regop.special <<= 6; - } - instr |= regop.n | regop.mode | regop.special; - } - if (n_ops == 3) - { - parse_regop (®op, args[3], oP->operand[2]); - if (regop.special) - { - regop.mode = regop.special; - } - instr |= (regop.n <<= 19) | (regop.mode <<= 13); - } - emit (instr); -} - - -/***************************************************************************** - relax_cobr: - Replace cobr instruction in a code fragment with equivalent branch and - compare instructions, so it can reach beyond a 13-bit displacement. - Set up an address fix/relocation for the new branch instruction. - - *************************************************************************** */ - -/* This "conditional jump" table maps cobr instructions into - equivalent compare and branch opcodes. */ -static const -struct -{ - long compare; - long branch; -} - -coj[] = -{ /* COBR OPCODE: */ - { CHKBIT, BNO }, /* 0x30 - bbc */ - { CMPO, BG }, /* 0x31 - cmpobg */ - { CMPO, BE }, /* 0x32 - cmpobe */ - { CMPO, BGE }, /* 0x33 - cmpobge */ - { CMPO, BL }, /* 0x34 - cmpobl */ - { CMPO, BNE }, /* 0x35 - cmpobne */ - { CMPO, BLE }, /* 0x36 - cmpoble */ - { CHKBIT, BO }, /* 0x37 - bbs */ - { CMPI, BNO }, /* 0x38 - cmpibno */ - { CMPI, BG }, /* 0x39 - cmpibg */ - { CMPI, BE }, /* 0x3a - cmpibe */ - { CMPI, BGE }, /* 0x3b - cmpibge */ - { CMPI, BL }, /* 0x3c - cmpibl */ - { CMPI, BNE }, /* 0x3d - cmpibne */ - { CMPI, BLE }, /* 0x3e - cmpible */ - { CMPI, BO }, /* 0x3f - cmpibo */ -}; - -static -void -relax_cobr (fragP) - register fragS *fragP; /* fragP->fr_opcode is assumed to point to - * the cobr instruction, which comes at the - * end of the code fragment. - */ -{ - int opcode, src1, src2, m1, s2; - /* Bit fields from cobr instruction */ - long bp_bits; /* Branch prediction bits from cobr instruction */ - long instr; /* A single i960 instruction */ - /* ->instruction to be replaced */ - char *iP; - fixS *fixP; /* Relocation that can be done at assembly time */ - - /* PICK UP & PARSE COBR INSTRUCTION */ - iP = fragP->fr_opcode; - instr = md_chars_to_number (iP, 4); - opcode = ((instr >> 24) & 0xff) - 0x30; /* "-0x30" for table index */ - src1 = (instr >> 19) & 0x1f; - m1 = (instr >> 13) & 1; - s2 = instr & 1; - src2 = (instr >> 14) & 0x1f; - bp_bits = instr & BP_MASK; - - /* GENERATE AND OUTPUT COMPARE INSTRUCTION */ - instr = coj[opcode].compare - | src1 | (m1 << 11) | (s2 << 6) | (src2 << 14); - md_number_to_chars (iP, instr, 4); - - /* OUTPUT BRANCH INSTRUCTION */ - md_number_to_chars (iP + 4, coj[opcode].branch | bp_bits, 4); - - /* SET UP ADDRESS FIXUP/RELOCATION */ - fixP = fix_new (fragP, - iP + 4 - fragP->fr_literal, - 4, - fragP->fr_symbol, - fragP->fr_offset, - 1, - NO_RELOC); - - fixP->fx_bit_fixP = (bit_fixS *) 24; /* Store size of bit field */ - - fragP->fr_fix += 4; - frag_wane (fragP); -} - - -/***************************************************************************** - reloc_callj: Relocate a 'callj' instruction - - This is a "non-(GNU)-standard" machine-dependent hook. The base - assembler calls it when it decides it can relocate an address at - assembly time instead of emitting a relocation directive. - - Check to see if the relocation involves a 'callj' instruction to a: - sysproc: Replace the default 'call' instruction with a 'calls' - leafproc: Replace the default 'call' instruction with a 'bal'. - other proc: Do nothing. - - See b.out.h for details on the 'n_other' field in a symbol structure. - - IMPORTANT!: - Assumes the caller has already figured out, in the case of a leafproc, - to use the 'bal' entry point, and has substituted that symbol into the - passed fixup structure. - - *************************************************************************** */ -void -reloc_callj (fixP) - /* Relocation that can be done at assembly time */ - fixS *fixP; -{ - /* Points to the binary for the instruction being relocated. */ - char *where; - - if (!fixP->fx_tcbit) - { - /* This wasn't a callj instruction in the first place */ - return; - } - - where = fixP->fx_frag->fr_literal + fixP->fx_where; - - if (TC_S_IS_SYSPROC (fixP->fx_addsy)) - { - /* Symbol is a .sysproc: replace 'call' with 'calls'. System - procedure number is (other-1). */ - md_number_to_chars (where, CALLS | TC_S_GET_SYSPROC (fixP->fx_addsy), 4); - - /* Nothing else needs to be done for this instruction. Make - sure 'md_number_to_field()' will perform a no-op. */ - fixP->fx_bit_fixP = (bit_fixS *) 1; - - } - else if (TC_S_IS_CALLNAME (fixP->fx_addsy)) - { - /* Should not happen: see block comment above */ - as_fatal (_("Trying to 'bal' to %s"), S_GET_NAME (fixP->fx_addsy)); - } - else if (TC_S_IS_BALNAME (fixP->fx_addsy)) - { - /* Replace 'call' with 'bal'; both instructions have the same - format, so calling code should complete relocation as if - nothing happened here. */ - md_number_to_chars (where, BAL, 4); - } - else if (TC_S_IS_BADPROC (fixP->fx_addsy)) - { - as_bad (_("Looks like a proc, but can't tell what kind.\n")); - } /* switch on proc type */ - - /* else Symbol is neither a sysproc nor a leafproc */ -} - - -/***************************************************************************** - s_leafproc: process .leafproc pseudo-op - - .leafproc takes two arguments, the second one is optional: - arg[1]: name of 'call' entry point to leaf procedure - arg[2]: name of 'bal' entry point to leaf procedure - - If the two arguments are identical, or if the second one is missing, - the first argument is taken to be the 'bal' entry point. - - If there are 2 distinct arguments, we must make sure that the 'bal' - entry point immediately follows the 'call' entry point in the linked - list of symbols. - - *************************************************************************** */ -static void -s_leafproc (n_ops, args) - int n_ops; /* Number of operands */ - char *args[]; /* args[1]->1st operand, args[2]->2nd operand */ -{ - symbolS *callP; /* Pointer to leafproc 'call' entry point symbol */ - symbolS *balP; /* Pointer to leafproc 'bal' entry point symbol */ - - if ((n_ops != 1) && (n_ops != 2)) - { - as_bad (_("should have 1 or 2 operands")); - return; - } /* Check number of arguments */ - - /* Find or create symbol for 'call' entry point. */ - callP = symbol_find_or_make (args[1]); - - if (TC_S_IS_CALLNAME (callP)) - { - as_warn (_("Redefining leafproc %s"), S_GET_NAME (callP)); - } /* is leafproc */ - - /* If that was the only argument, use it as the 'bal' entry point. - * Otherwise, mark it as the 'call' entry point and find or create - * another symbol for the 'bal' entry point. - */ - if ((n_ops == 1) || !strcmp (args[1], args[2])) - { - TC_S_FORCE_TO_BALNAME (callP); - - } - else - { - TC_S_FORCE_TO_CALLNAME (callP); - - balP = symbol_find_or_make (args[2]); - if (TC_S_IS_CALLNAME (balP)) - { - as_warn (_("Redefining leafproc %s"), S_GET_NAME (balP)); - } - TC_S_FORCE_TO_BALNAME (balP); - -#ifndef OBJ_ELF - tc_set_bal_of_call (callP, balP); -#endif - } /* if only one arg, or the args are the same */ -} - - -/* - s_sysproc: process .sysproc pseudo-op - - .sysproc takes two arguments: - arg[1]: name of entry point to system procedure - arg[2]: 'entry_num' (index) of system procedure in the range - [0,31] inclusive. - - For [ab].out, we store the 'entrynum' in the 'n_other' field of - the symbol. Since that entry is normally 0, we bias 'entrynum' - by adding 1 to it. It must be unbiased before it is used. */ -static void -s_sysproc (n_ops, args) - int n_ops; /* Number of operands */ - char *args[]; /* args[1]->1st operand, args[2]->2nd operand */ -{ - expressionS exp; - symbolS *symP; - - if (n_ops != 2) - { - as_bad (_("should have two operands")); - return; - } /* bad arg count */ - - /* Parse "entry_num" argument and check it for validity. */ - parse_expr (args[2], &exp); - if (exp.X_op != O_constant - || (offs (exp) < 0) - || (offs (exp) > 31)) - { - as_bad (_("'entry_num' must be absolute number in [0,31]")); - return; - } - - /* Find/make symbol and stick entry number (biased by +1) into it */ - symP = symbol_find_or_make (args[1]); - - if (TC_S_IS_SYSPROC (symP)) - { - as_warn (_("Redefining entrynum for sysproc %s"), S_GET_NAME (symP)); - } /* redefining */ - - TC_S_SET_SYSPROC (symP, offs (exp)); /* encode entry number */ - TC_S_FORCE_TO_SYSPROC (symP); -} - - -/***************************************************************************** - shift_ok: - Determine if a "shlo" instruction can be used to implement a "ldconst". - This means that some number X < 32 can be shifted left to produce the - constant of interest. - - Return the shift count, or 0 if we can't do it. - Caller calculates X by shifting original constant right 'shift' places. - - *************************************************************************** */ -static -int -shift_ok (n) - int n; /* The constant of interest */ -{ - int shift; /* The shift count */ - - if (n <= 0) - { - /* Can't do it for negative numbers */ - return 0; - } - - /* Shift 'n' right until a 1 is about to be lost */ - for (shift = 0; (n & 1) == 0; shift++) - { - n >>= 1; - } - - if (n >= 32) - { - return 0; - } - return shift; -} - - -/* syntax: issue syntax error */ - -static void -syntax () -{ - as_bad (_("syntax error")); -} /* syntax() */ - - -/* targ_has_sfr: - - Return TRUE iff the target architecture supports the specified - special-function register (sfr). */ - -static -int -targ_has_sfr (n) - int n; /* Number (0-31) of sfr */ -{ - switch (architecture) - { - case ARCH_KA: - case ARCH_KB: - case ARCH_MC: - case ARCH_JX: - return 0; - case ARCH_HX: - return ((0 <= n) && (n <= 4)); - case ARCH_CA: - default: - return ((0 <= n) && (n <= 2)); - } -} - - -/* targ_has_iclass: - - Return TRUE iff the target architecture supports the indicated - class of instructions. */ -static -int -targ_has_iclass (ic) - /* Instruction class; one of: - I_BASE, I_CX, I_DEC, I_KX, I_FP, I_MIL, I_CASIM, I_CX2, I_HX, I_HX2 - */ - int ic; -{ - iclasses_seen |= ic; - switch (architecture) - { - case ARCH_KA: - return ic & (I_BASE | I_KX); - case ARCH_KB: - return ic & (I_BASE | I_KX | I_FP | I_DEC); - case ARCH_MC: - return ic & (I_BASE | I_KX | I_FP | I_DEC | I_MIL); - case ARCH_CA: - return ic & (I_BASE | I_CX | I_CX2 | I_CASIM); - case ARCH_JX: - return ic & (I_BASE | I_CX2 | I_JX); - case ARCH_HX: - return ic & (I_BASE | I_CX2 | I_JX | I_HX); - default: - if ((iclasses_seen & (I_KX | I_FP | I_DEC | I_MIL)) - && (iclasses_seen & (I_CX | I_CX2))) - { - as_warn (_("architecture of opcode conflicts with that of earlier instruction(s)")); - iclasses_seen &= ~ic; - } - return 1; - } -} - -/* Handle the MRI .endian pseudo-op. */ - -static void -s_endian (ignore) - int ignore; -{ - char *name; - char c; - - name = input_line_pointer; - c = get_symbol_end (); - if (strcasecmp (name, "little") == 0) - ; - else if (strcasecmp (name, "big") == 0) - as_bad (_("big endian mode is not supported")); - else - as_warn (_("ignoring unrecognized .endian type `%s'"), name); - - *input_line_pointer = c; - - demand_empty_rest_of_line (); -} - -/* We have no need to default values of symbols. */ - -/* ARGSUSED */ -symbolS * -md_undefined_symbol (name) - char *name; -{ - return 0; -} - -/* Exactly what point is a PC-relative offset relative TO? - On the i960, they're relative to the address of the instruction, - which we have set up as the address of the fixup too. */ -long -md_pcrel_from (fixP) - fixS *fixP; -{ - return fixP->fx_where + fixP->fx_frag->fr_address; -} - -#ifdef BFD_ASSEMBLER -int -md_apply_fix (fixP, valp) - fixS *fixP; - valueT *valp; -#else -void -md_apply_fix (fixP, val) - fixS *fixP; - long val; -#endif -{ -#ifdef BFD_ASSEMBLER - long val = *valp; -#endif - char *place = fixP->fx_where + fixP->fx_frag->fr_literal; - - if (!fixP->fx_bit_fixP) - { -#ifndef BFD_ASSEMBLER - /* For callx, we always want to write out zero, and emit a - symbolic relocation. */ - if (fixP->fx_bsr) - val = 0; - - fixP->fx_addnumber = val; -#endif - - md_number_to_imm (place, val, fixP->fx_size, fixP); - } - else - md_number_to_field (place, val, fixP->fx_bit_fixP); - -#ifdef BFD_ASSEMBLER - return 0; -#endif -} - -#if defined(OBJ_AOUT) | defined(OBJ_BOUT) -void -tc_bout_fix_to_chars (where, fixP, segment_address_in_file) - char *where; - fixS *fixP; - relax_addressT segment_address_in_file; -{ - static const unsigned char nbytes_r_length[] = {42, 0, 1, 42, 2}; - struct relocation_info ri; - symbolS *symbolP; - - memset ((char *) &ri, '\0', sizeof (ri)); - symbolP = fixP->fx_addsy; - know (symbolP != 0 || fixP->fx_r_type != NO_RELOC); - ri.r_bsr = fixP->fx_bsr; /*SAC LD RELAX HACK */ - /* These two 'cuz of NS32K */ - ri.r_callj = fixP->fx_tcbit; - if (fixP->fx_bit_fixP) - ri.r_length = 2; - else - ri.r_length = nbytes_r_length[fixP->fx_size]; - ri.r_pcrel = fixP->fx_pcrel; - ri.r_address = fixP->fx_frag->fr_address + fixP->fx_where - segment_address_in_file; - - if (fixP->fx_r_type != NO_RELOC) - { - switch (fixP->fx_r_type) - { - case rs_align: - ri.r_index = -2; - ri.r_pcrel = 1; - ri.r_length = fixP->fx_size - 1; - break; - case rs_org: - ri.r_index = -2; - ri.r_pcrel = 0; - break; - case rs_fill: - ri.r_index = -1; - break; - default: - abort (); - } - ri.r_extern = 0; - } - else if (linkrelax || !S_IS_DEFINED (symbolP) || fixP->fx_bsr) - { - ri.r_extern = 1; - ri.r_index = symbolP->sy_number; - } - else - { - ri.r_extern = 0; - ri.r_index = S_GET_TYPE (symbolP); - } - - /* Output the relocation information in machine-dependent form. */ - md_ri_to_chars (where, &ri); -} - -#endif /* OBJ_AOUT or OBJ_BOUT */ - -#if defined (OBJ_COFF) && defined (BFD) -short -tc_coff_fix2rtype (fixP) - fixS *fixP; -{ - if (fixP->fx_bsr) - abort (); - - if (fixP->fx_pcrel == 0 && fixP->fx_size == 4) - return R_RELLONG; - - if (fixP->fx_pcrel != 0 && fixP->fx_size == 4) - return R_IPRMED; - - abort (); - return 0; -} - -int -tc_coff_sizemachdep (frag) - fragS *frag; -{ - if (frag->fr_next) - return frag->fr_next->fr_address - frag->fr_address; - else - return 0; -} -#endif - -/* Align an address by rounding it up to the specified boundary. */ -valueT -md_section_align (seg, addr) - segT seg; - valueT addr; /* Address to be rounded up */ -{ - int align; -#ifdef BFD_ASSEMBLER - align = bfd_get_section_alignment (stdoutput, seg); -#else - align = section_alignment[(int) seg]; -#endif - return (addr + (1 << align) - 1) & (-1 << align); -} - -extern int coff_flags; - -#ifdef OBJ_COFF -void -tc_headers_hook (headers) - object_headers *headers; -{ - switch (architecture) - { - case ARCH_KA: - coff_flags |= F_I960KA; - break; - - case ARCH_KB: - coff_flags |= F_I960KB; - break; - - case ARCH_MC: - coff_flags |= F_I960MC; - break; - - case ARCH_CA: - coff_flags |= F_I960CA; - break; - - case ARCH_JX: - coff_flags |= F_I960JX; - break; - - case ARCH_HX: - coff_flags |= F_I960HX; - break; - - default: - if (iclasses_seen == I_BASE) - coff_flags |= F_I960CORE; - else if (iclasses_seen & I_CX) - coff_flags |= F_I960CA; - else if (iclasses_seen & I_HX) - coff_flags |= F_I960HX; - else if (iclasses_seen & I_JX) - coff_flags |= F_I960JX; - else if (iclasses_seen & I_CX2) - coff_flags |= F_I960CA; - else if (iclasses_seen & I_MIL) - coff_flags |= F_I960MC; - else if (iclasses_seen & (I_DEC | I_FP)) - coff_flags |= F_I960KB; - else - coff_flags |= F_I960KA; - break; - } - - if (flag_readonly_data_in_text) - { - headers->filehdr.f_magic = I960RWMAGIC; - headers->aouthdr.magic = OMAGIC; - } - else - { - headers->filehdr.f_magic = I960ROMAGIC; - headers->aouthdr.magic = NMAGIC; - } /* set magic numbers */ -} - -#endif /* OBJ_COFF */ - -#ifndef BFD_ASSEMBLER - -/* Things going on here: - - For bout, We need to assure a couple of simplifying - assumptions about leafprocs for the linker: the leafproc - entry symbols will be defined in the same assembly in - which they're declared with the '.leafproc' directive; - and if a leafproc has both 'call' and 'bal' entry points - they are both global or both local. - - For coff, the call symbol has a second aux entry that - contains the bal entry point. The bal symbol becomes a - label. - - For coff representation, the call symbol has a second aux entry that - contains the bal entry point. The bal symbol becomes a label. */ - -void -tc_crawl_symbol_chain (headers) - object_headers *headers; -{ - symbolS *symbolP; - - for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP)) - { -#ifdef OBJ_COFF - if (TC_S_IS_SYSPROC (symbolP)) - { - /* second aux entry already contains the sysproc number */ - S_SET_NUMBER_AUXILIARY (symbolP, 2); - S_SET_STORAGE_CLASS (symbolP, C_SCALL); - S_SET_DATA_TYPE (symbolP, S_GET_DATA_TYPE (symbolP) | (DT_FCN << N_BTSHFT)); - continue; - } /* rewrite sysproc */ -#endif /* OBJ_COFF */ - - if (!TC_S_IS_BALNAME (symbolP) && !TC_S_IS_CALLNAME (symbolP)) - { - continue; - } /* Not a leafproc symbol */ - - if (!S_IS_DEFINED (symbolP)) - { - as_bad (_("leafproc symbol '%s' undefined"), S_GET_NAME (symbolP)); - } /* undefined leaf */ - - if (TC_S_IS_CALLNAME (symbolP)) - { - symbolS *balP = tc_get_bal_of_call (symbolP); - if (S_IS_EXTERNAL (symbolP) != S_IS_EXTERNAL (balP)) - { - S_SET_EXTERNAL (symbolP); - S_SET_EXTERNAL (balP); - as_warn (_("Warning: making leafproc entries %s and %s both global\n"), - S_GET_NAME (symbolP), S_GET_NAME (balP)); - } /* externality mismatch */ - } /* if callname */ - } /* walk the symbol chain */ -} - -#endif /* ! BFD_ASSEMBLER */ - -/* For aout or bout, the bal immediately follows the call. - - For coff, we cheat and store a pointer to the bal symbol in the - second aux entry of the call. */ - -#undef OBJ_ABOUT -#ifdef OBJ_AOUT -#define OBJ_ABOUT -#endif -#ifdef OBJ_BOUT -#define OBJ_ABOUT -#endif - -void -tc_set_bal_of_call (callP, balP) - symbolS *callP; - symbolS *balP; -{ - know (TC_S_IS_CALLNAME (callP)); - know (TC_S_IS_BALNAME (balP)); - -#ifdef OBJ_COFF - - callP->sy_tc = balP; - S_SET_NUMBER_AUXILIARY (callP, 2); - -#else /* ! OBJ_COFF */ -#ifdef OBJ_ABOUT - - /* If the 'bal' entry doesn't immediately follow the 'call' - * symbol, unlink it from the symbol list and re-insert it. - */ - if (symbol_next (callP) != balP) - { - symbol_remove (balP, &symbol_rootP, &symbol_lastP); - symbol_append (balP, callP, &symbol_rootP, &symbol_lastP); - } /* if not in order */ - -#else /* ! OBJ_ABOUT */ - as_fatal ("Only supported for a.out, b.out, or COFF"); -#endif /* ! OBJ_ABOUT */ -#endif /* ! OBJ_COFF */ -} - -symbolS * -tc_get_bal_of_call (callP) - symbolS *callP; -{ - symbolS *retval; - - know (TC_S_IS_CALLNAME (callP)); - -#ifdef OBJ_COFF - retval = callP->sy_tc; -#else -#ifdef OBJ_ABOUT - retval = symbol_next (callP); -#else - as_fatal ("Only supported for a.out, b.out, or COFF"); -#endif /* ! OBJ_ABOUT */ -#endif /* ! OBJ_COFF */ - - know (TC_S_IS_BALNAME (retval)); - return retval; -} /* _tc_get_bal_of_call() */ - -void -tc_coff_symbol_emit_hook (symbolP) - symbolS *symbolP; -{ - if (TC_S_IS_CALLNAME (symbolP)) - { -#ifdef OBJ_COFF - symbolS *balP = tc_get_bal_of_call (symbolP); - -#if 0 - /* second aux entry contains the bal entry point */ - S_SET_NUMBER_AUXILIARY (symbolP, 2); -#endif - symbolP->sy_symbol.ost_auxent[1].x_bal.x_balntry = S_GET_VALUE (balP); - if (S_GET_STORAGE_CLASS (symbolP) == C_EXT) - S_SET_STORAGE_CLASS (symbolP, C_LEAFEXT); - else - S_SET_STORAGE_CLASS (symbolP, C_LEAFSTAT); - S_SET_DATA_TYPE (symbolP, S_GET_DATA_TYPE (symbolP) | (DT_FCN << N_BTSHFT)); - /* fix up the bal symbol */ - S_SET_STORAGE_CLASS (balP, C_LABEL); -#endif /* OBJ_COFF */ - } /* only on calls */ -} - -void -i960_handle_align (fragp) - fragS *fragp; -{ - if (!linkrelax) - return; - -#ifndef OBJ_BOUT - - as_bad (_("option --link-relax is only supported in b.out format")); - linkrelax = 0; - return; - -#else - - /* The text section "ends" with another alignment reloc, to which we - aren't adding padding. */ - if (fragp->fr_next == text_last_frag - || fragp->fr_next == data_last_frag) - return; - - /* alignment directive */ - fix_new (fragp, fragp->fr_fix, fragp->fr_offset, 0, 0, 0, - (int) fragp->fr_type); -#endif /* OBJ_BOUT */ -} - -int -i960_validate_fix (fixP, this_segment_type, add_symbolPP) - fixS *fixP; - segT this_segment_type; - symbolS **add_symbolPP; -{ -#define add_symbolP (*add_symbolPP) - if (fixP->fx_tcbit && TC_S_IS_CALLNAME (add_symbolP)) - { - /* Relocation should be done via the associated 'bal' - entry point symbol. */ - - if (!TC_S_IS_BALNAME (tc_get_bal_of_call (add_symbolP))) - { - as_bad (_("No 'bal' entry point for leafproc %s"), - S_GET_NAME (add_symbolP)); - return 1; - } - fixP->fx_addsy = add_symbolP = tc_get_bal_of_call (add_symbolP); - } -#if 0 - /* Still have to work out other conditions for these tests. */ - { - if (fixP->fx_tcbit) - { - as_bad (_("callj to difference of two symbols")); - return 1; - } - reloc_callj (fixP); - if ((int) fixP->fx_bit_fixP == 13) - { - /* This is a COBR instruction. They have only a 13-bit - displacement and are only to be used for local branches: - flag as error, don't generate relocation. */ - as_bad (_("can't use COBR format with external label")); - fixP->fx_addsy = NULL; /* No relocations please. */ - return 1; - } - } -#endif -#undef add_symbolP - return 0; -} - -#ifdef BFD_ASSEMBLER - -/* From cgen.c: */ - -static short -tc_bfd_fix2rtype (fixP) - fixS *fixP; -{ -#if 0 - if (fixP->fx_bsr) - abort (); -#endif - - if (fixP->fx_pcrel == 0 && fixP->fx_size == 4) - return BFD_RELOC_32; - - if (fixP->fx_pcrel != 0 && fixP->fx_size == 4) - return BFD_RELOC_24_PCREL; - - abort (); - return 0; -} - -/* Translate internal representation of relocation info to BFD target - format. - - FIXME: To what extent can we get all relevant targets to use this? */ - -arelent * -tc_gen_reloc (section, fixP) - asection *section; - fixS *fixP; -{ - arelent * reloc; - - reloc = (arelent *) xmalloc (sizeof (arelent)); - - /* HACK: Is this right? */ - fixP->fx_r_type = tc_bfd_fix2rtype (fixP); - - reloc->howto = bfd_reloc_type_lookup (stdoutput, fixP->fx_r_type); - if (reloc->howto == (reloc_howto_type *) NULL) - { - as_bad_where (fixP->fx_file, fixP->fx_line, - "internal error: can't export reloc type %d (`%s')", - fixP->fx_r_type, - bfd_get_reloc_code_name (fixP->fx_r_type)); - return NULL; - } - - assert (!fixP->fx_pcrel == !reloc->howto->pc_relative); - - reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); - *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixP->fx_addsy); - reloc->address = fixP->fx_frag->fr_address + fixP->fx_where; - reloc->addend = fixP->fx_addnumber; - - return reloc; -} - -/* end from cgen.c */ - -#endif /* BFD_ASSEMBLER */ - -/* end of tc-i960.c */ |