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Diffstat (limited to 'gas/config/tc-cris.c')
| -rw-r--r-- | gas/config/tc-cris.c | 3195 |
1 files changed, 0 insertions, 3195 deletions
diff --git a/gas/config/tc-cris.c b/gas/config/tc-cris.c deleted file mode 100644 index a83cf8ac94d..00000000000 --- a/gas/config/tc-cris.c +++ /dev/null @@ -1,3195 +0,0 @@ -/* tc-cris.c -- Assembler code for the CRIS CPU core. - Copyright 2000, 2001 Free Software Foundation, Inc. - - Contributed by Axis Communications AB, Lund, Sweden. - Originally written for GAS 1.38.1 by Mikael Asker. - Updates, BFDizing, GNUifying and ELF support by Hans-Peter Nilsson. - - This file is part of GAS, the GNU Assembler. - - 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. */ - -#include <stdio.h> -#include <ctype.h> -#include "as.h" -#include "subsegs.h" -#include "opcode/cris.h" -#include "dwarf2dbg.h" - -/* Conventions used here: - Generally speaking, pointers to binutils types such as "fragS" and - "expressionS" get parameter and variable names ending in "P", such as - "fragP", to harmonize with the rest of the binutils code. Other - pointers get a "p" suffix, such as "bufp". Any function or type-name - that could clash with a current or future binutils or GAS function get - a "cris_" prefix. */ - -#define SYNTAX_RELAX_REG_PREFIX "no_register_prefix" -#define SYNTAX_ENFORCE_REG_PREFIX "register_prefix" -#define SYNTAX_USER_SYM_LEADING_UNDERSCORE "leading_underscore" -#define SYNTAX_USER_SYM_NO_LEADING_UNDERSCORE "no_leading_underscore" -#define REGISTER_PREFIX_CHAR '$' - -/* Like in ":GOT", ":GOTOFF" etc. Other ports use '@', but that's in - line_separator_chars for CRIS, so we avoid it. */ -#define PIC_SUFFIX_CHAR ':' - -/* This might be CRIS_INSN_NONE if we're assembling a prefix-insn only. - Note that some prefix-insns might be assembled as CRIS_INSN_NORMAL. */ -enum cris_insn_kind -{ - CRIS_INSN_NORMAL, CRIS_INSN_NONE, CRIS_INSN_BRANCH -}; - -/* An instruction will have one of these prefixes. - Although the same bit-pattern, we handle BDAP with an immediate - expression (eventually quick or [pc+]) different from when we only have - register expressions. */ -enum prefix_kind -{ - PREFIX_NONE, PREFIX_BDAP_IMM, PREFIX_BDAP, PREFIX_BIAP, PREFIX_DIP, - PREFIX_PUSH -}; - -/* The prefix for an instruction. */ -struct cris_prefix -{ - enum prefix_kind kind; - int base_reg_number; - unsigned int opcode; - - /* There might be an expression to be evaluated, like I in [rN+I]. */ - expressionS expr; - - /* If there's an expression, we might need a relocation. Here's the - type of what relocation to start relaxaton with. - The relocation is assumed to start immediately after the prefix insn, - so we don't provide an offset. */ - enum bfd_reloc_code_real reloc; -}; - -/* The description of the instruction being assembled. */ -struct cris_instruction -{ - /* If CRIS_INSN_NONE, then this insn is of zero length. */ - enum cris_insn_kind insn_type; - - /* If a special register was mentioned, this is its description, else - it is NULL. */ - const struct cris_spec_reg *spec_reg; - - unsigned int opcode; - - /* An insn may have at most one expression; theoretically there could be - another in its prefix (but I don't see how that could happen). */ - expressionS expr; - - /* The expression might need a relocation. Here's one to start - relaxation with. */ - enum bfd_reloc_code_real reloc; - - /* The size in bytes of an immediate expression, or zero if - nonapplicable. */ - int imm_oprnd_size; -}; - -static void cris_process_instruction PARAMS ((char *, - struct cris_instruction *, - struct cris_prefix *)); -static int get_bwd_size_modifier PARAMS ((char **, int *)); -static int get_bw_size_modifier PARAMS ((char **, int *)); -static int get_gen_reg PARAMS ((char **, int *)); -static int get_spec_reg PARAMS ((char **, - const struct cris_spec_reg **)); -static int get_autoinc_prefix_or_indir_op PARAMS ((char **, - struct cris_prefix *, - int *, int *, int *, - expressionS *)); -static int get_3op_or_dip_prefix_op PARAMS ((char **, - struct cris_prefix *)); -static int cris_get_expression PARAMS ((char **, expressionS *)); -static int get_flags PARAMS ((char **, int *)); -static void gen_bdap PARAMS ((int, expressionS *)); -static int branch_disp PARAMS ((int)); -static void gen_cond_branch_32 PARAMS ((char *, char *, fragS *, - symbolS *, symbolS *, long int)); -static void cris_number_to_imm PARAMS ((char *, long, int, fixS *, segT)); -static void cris_create_short_jump PARAMS ((char *, addressT, addressT, - fragS *, symbolS *)); -static void s_syntax PARAMS ((int)); -static void s_cris_file PARAMS ((int)); -static void s_cris_loc PARAMS ((int)); - -/* Get ":GOT", ":GOTOFF", ":PLT" etc. suffixes. */ -static void cris_get_pic_suffix PARAMS ((char **, - bfd_reloc_code_real_type *, - expressionS *)); -static unsigned int cris_get_pic_reloc_size - PARAMS ((bfd_reloc_code_real_type)); - -/* All the .syntax functions. */ -static void cris_force_reg_prefix PARAMS ((void)); -static void cris_relax_reg_prefix PARAMS ((void)); -static void cris_sym_leading_underscore PARAMS ((void)); -static void cris_sym_no_leading_underscore PARAMS ((void)); -static char *cris_insn_first_word_frag PARAMS ((void)); - -/* Handle to the opcode hash table. */ -static struct hash_control *op_hash = NULL; - -/* Whether we demand that registers have a `$' prefix. Default here. */ -static boolean demand_register_prefix = false; - -/* Whether global user symbols have a leading underscore. Default here. */ -static boolean symbols_have_leading_underscore = true; - -/* Whether or not we allow PIC, and expand to PIC-friendly constructs. */ -static boolean pic = false; - -const pseudo_typeS md_pseudo_table[] = -{ - {"dword", cons, 4}, - {"syntax", s_syntax, 0}, - {"file", s_cris_file, 0}, - {"loc", s_cris_loc, 0}, - {NULL, 0, 0} -}; - -static int warn_for_branch_expansion = 0; - -const char cris_comment_chars[] = ";"; - -/* This array holds the chars 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 slash-star will always start a comment. */ -const char line_comment_chars[] = "#"; -const char line_separator_chars[] = "@"; - -/* Now all floating point support is shut off. See md_atof. */ -const char EXP_CHARS[] = ""; -const char FLT_CHARS[] = ""; - -/* For CRIS, we encode the relax_substateTs (in e.g. fr_substate) as: - 2 1 0 - ---/ /--+-----------------+-----------------+-----------------+ - | what state ? | how long ? | - ---/ /--+-----------------+-----------------+-----------------+ - - The "how long" bits are 00 = byte, 01 = word, 10 = dword (long). - This is a Un*x convention. - Not all lengths are legit for a given value of (what state). - - Groups for CRIS address relaxing: - - 1. Bcc - length: byte, word, 10-byte expansion - - 2. BDAP - length: byte, word, dword */ - -#define STATE_CONDITIONAL_BRANCH (1) -#define STATE_BASE_PLUS_DISP_PREFIX (2) - -#define STATE_LENGTH_MASK (3) -#define STATE_BYTE (0) -#define STATE_WORD (1) -#define STATE_DWORD (2) -/* Symbol undefined. */ -#define STATE_UNDF (3) -#define STATE_MAX_LENGTH (3) - -/* These displacements are relative to the adress following the opcode - word of the instruction. The first letter is Byte, Word. The 2nd - letter is Forward, Backward. */ - -#define BRANCH_BF ( 254) -#define BRANCH_BB (-256) -#define BRANCH_WF (2 + 32767) -#define BRANCH_WB (2 + -32768) - -#define BDAP_BF ( 127) -#define BDAP_BB (-128) -#define BDAP_WF ( 32767) -#define BDAP_WB (-32768) - -#define ENCODE_RELAX(what, length) (((what) << 2) + (length)) - -const relax_typeS md_cris_relax_table[] = -{ - /* Error sentinel (0, 0). */ - {1, 1, 0, 0}, - - /* Unused (0, 1). */ - {1, 1, 0, 0}, - - /* Unused (0, 2). */ - {1, 1, 0, 0}, - - /* Unused (0, 3). */ - {1, 1, 0, 0}, - - /* Bcc o (1, 0). */ - {BRANCH_BF, BRANCH_BB, 0, ENCODE_RELAX (1, 1)}, - - /* Bcc [PC+] (1, 1). */ - {BRANCH_WF, BRANCH_WB, 2, ENCODE_RELAX (1, 2)}, - - /* BEXT/BWF, BA, JUMP (external), JUMP (always), Bnot_cc, JUMP (default) - (1, 2). */ - {0, 0, 10, 0}, - - /* Unused (1, 3). */ - {1, 1, 0, 0}, - - /* BDAP o (2, 0). */ - {BDAP_BF, BDAP_BB, 0, ENCODE_RELAX (2, 1)}, - - /* BDAP.[bw] [PC+] (2, 1). */ - {BDAP_WF, BDAP_WB, 2, ENCODE_RELAX (2, 2)}, - - /* BDAP.d [PC+] (2, 2). */ - {0, 0, 4, 0} -}; - -#undef BRANCH_BF -#undef BRANCH_BB -#undef BRANCH_WF -#undef BRANCH_WB -#undef BDAP_BF -#undef BDAP_BB -#undef BDAP_WF -#undef BDAP_WB - -/* Target-specific multicharacter options, not const-declared at usage - in 2.9.1 and CVS of 2000-02-16. */ -struct option md_longopts[] = -{ -#define OPTION_NO_US (OPTION_MD_BASE + 0) - {"no-underscore", no_argument, NULL, OPTION_NO_US}, -#define OPTION_US (OPTION_MD_BASE + 1) - {"underscore", no_argument, NULL, OPTION_US}, -#define OPTION_PIC (OPTION_MD_BASE + 2) - {"pic", no_argument, NULL, OPTION_PIC}, - {NULL, no_argument, NULL, 0} -}; - -/* Not const-declared at usage in 2.9.1. */ -size_t md_longopts_size = sizeof (md_longopts); -const char *md_shortopts = "hHN"; - -/* At first glance, this may seems wrong and should be 4 (ba + nop); but - since a short_jump must skip a *number* of long jumps, it must also be - a long jump. Here, we hope to make it a "ba [16bit_offs]" and a "nop" - for the delay slot and hope that the jump table at most needs - 32767/4=8191 long-jumps. A branch is better than a jump, since it is - relative; we will not have a reloc to fix up somewhere. - - Note that we can't add relocs, because relaxation uses these fixed - numbers, and md_create_short_jump is called after relaxation. */ - -const int md_short_jump_size = 6; -const int md_long_jump_size = 6; - -/* Report output format. Small changes in output format (like elf - variants below) can happen until all options are parsed, but after - that, the output format must remain fixed. */ - -const char * -cris_target_format () -{ - switch (OUTPUT_FLAVOR) - { - case bfd_target_aout_flavour: - return "a.out-cris"; - - case bfd_target_elf_flavour: - if (symbols_have_leading_underscore) - return "elf32-us-cris"; - return "elf32-cris"; - - default: - abort (); - return NULL; - } -} - -/* Prepare machine-dependent frags for relaxation. - - Called just before relaxation starts. Any symbol that is now undefined - will not become defined. - - Return the correct fr_subtype in the frag. - - Return the initial "guess for fr_var" to caller. The guess for fr_var - is *actually* the growth beyond fr_fix. Whatever we do to grow fr_fix - or fr_var contributes to our returned value. - - Although it may not be explicit in the frag, pretend - fr_var starts with a value. */ - -int -md_estimate_size_before_relax (fragP, segment_type) - fragS *fragP; - /* The segment is either N_DATA or N_TEXT. */ - segT segment_type; -{ - int old_fr_fix; - - old_fr_fix = fragP->fr_fix; - - switch (fragP->fr_subtype) - { - case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_UNDF): - if (S_GET_SEGMENT (fragP->fr_symbol) == segment_type) - /* The symbol lies in the same segment - a relaxable case. */ - fragP->fr_subtype - = ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_BYTE); - else - /* Unknown or not the same segment, so not relaxable. */ - fragP->fr_subtype - = ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_DWORD); - fragP->fr_var = md_cris_relax_table[fragP->fr_subtype].rlx_length; - break; - - case ENCODE_RELAX (STATE_BASE_PLUS_DISP_PREFIX, STATE_UNDF): - /* Note that we can not do anything sane with relaxing - [rX + a_known_symbol_in_text], it will have to be a 32-bit - value. - - We could play tricks with managing a constant pool and make - a_known_symbol_in_text a "bdap [pc + offset]" pointing there - (like the GOT for ELF shared libraries), but that's no use, it - would in general be no shorter or faster code, only more - complicated. */ - - if (S_GET_SEGMENT (fragP->fr_symbol) != absolute_section) - { - /* Go for dword if not absolute or same segment. */ - fragP->fr_subtype - = ENCODE_RELAX (STATE_BASE_PLUS_DISP_PREFIX, STATE_DWORD); - fragP->fr_var = md_cris_relax_table[fragP->fr_subtype].rlx_length; - } - else - { - /* Absolute expression. */ - long int value; - value = S_GET_VALUE (fragP->fr_symbol) + fragP->fr_offset; - - if (value >= -128 && value <= 127) - { - /* Byte displacement. */ - (fragP->fr_opcode)[0] = value; - } - else - { - /* Word or dword displacement. */ - int pow2_of_size = 1; - char *writep; - - if (value < -32768 || value > 32767) - { - /* Outside word range, make it a dword. */ - pow2_of_size = 2; - } - - /* Modify the byte-offset BDAP into a word or dword offset - BDAP. Or really, a BDAP rX,8bit into a - BDAP.[wd] rX,[PC+] followed by a word or dword. */ - (fragP->fr_opcode)[0] = BDAP_PC_LOW + pow2_of_size * 16; - - /* Keep the register number in the highest four bits. */ - (fragP->fr_opcode)[1] &= 0xF0; - (fragP->fr_opcode)[1] |= BDAP_INCR_HIGH; - - /* It grew by two or four bytes. */ - fragP->fr_fix += 1 << pow2_of_size; - writep = fragP->fr_literal + old_fr_fix; - md_number_to_chars (writep, value, 1 << pow2_of_size); - } - frag_wane (fragP); - } - break; - - case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_BYTE): - case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_WORD): - case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_DWORD): - case ENCODE_RELAX (STATE_BASE_PLUS_DISP_PREFIX, STATE_BYTE): - case ENCODE_RELAX (STATE_BASE_PLUS_DISP_PREFIX, STATE_WORD): - case ENCODE_RELAX (STATE_BASE_PLUS_DISP_PREFIX, STATE_DWORD): - /* When relaxing a section for the second time, we don't need to - do anything except making sure that fr_var is set right. */ - fragP->fr_var = md_cris_relax_table[fragP->fr_subtype].rlx_length; - break; - - default: - BAD_CASE (fragP->fr_subtype); - } - - return fragP->fr_var + (fragP->fr_fix - old_fr_fix); -} - -/* Perform post-processing of machine-dependent frags after relaxation. - Called after relaxation is finished. - In: Address of frag. - fr_type == rs_machine_dependent. - fr_subtype is what the address relaxed to. - - Out: Any fixS:s and constants are set up. - - The caller will turn the frag into a ".space 0". */ - -void -md_convert_frag (abfd, sec, fragP) - bfd *abfd ATTRIBUTE_UNUSED; - segT sec ATTRIBUTE_UNUSED; - fragS *fragP; -{ - /* Pointer to first byte in variable-sized part of the frag. */ - char *var_partp; - - /* Pointer to first opcode byte in frag. */ - char *opcodep; - - /* Used to check integrity of the relaxation. - One of 2 = long, 1 = word, or 0 = byte. */ - int length_code; - - /* Size in bytes of variable-sized part of frag. */ - int var_part_size = 0; - - /* This is part of *fragP. It contains all information about addresses - and offsets to varying parts. */ - symbolS *symbolP; - unsigned long var_part_offset; - - /* Where, in file space, is _var of *fragP? */ - unsigned long address_of_var_part = 0; - - /* Where, in file space, does addr point? */ - unsigned long target_address; - - know (fragP->fr_type == rs_machine_dependent); - - length_code = fragP->fr_subtype & STATE_LENGTH_MASK; - know (length_code >= 0 && length_code < STATE_MAX_LENGTH); - - var_part_offset = fragP->fr_fix; - var_partp = fragP->fr_literal + var_part_offset; - opcodep = fragP->fr_opcode; - - symbolP = fragP->fr_symbol; - target_address = (symbolP ? S_GET_VALUE (symbolP) : 0) + fragP->fr_offset; - address_of_var_part = fragP->fr_address + var_part_offset; - - switch (fragP->fr_subtype) - { - case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_BYTE): - opcodep[0] = branch_disp ((target_address - address_of_var_part)); - var_part_size = 0; - break; - - case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_WORD): - /* We had a quick immediate branch, now turn it into a word one i.e. a - PC autoincrement. */ - opcodep[0] = BRANCH_PC_LOW; - opcodep[1] &= 0xF0; - opcodep[1] |= BRANCH_INCR_HIGH; - md_number_to_chars (var_partp, - (long) (target_address - (address_of_var_part + 2)), - 2); - var_part_size = 2; - break; - - case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_DWORD): - gen_cond_branch_32 (fragP->fr_opcode, var_partp, fragP, - fragP->fr_symbol, (symbolS *) NULL, - fragP->fr_offset); - /* Ten bytes added: a branch, nop and a jump. */ - var_part_size = 2 + 2 + 4 + 2; - break; - - case ENCODE_RELAX (STATE_BASE_PLUS_DISP_PREFIX, STATE_BYTE): - var_partp[0] = target_address - (address_of_var_part + 1); - var_part_size = 0; - break; - - case ENCODE_RELAX (STATE_BASE_PLUS_DISP_PREFIX, STATE_WORD): - /* We had a BDAP 8-bit "quick immediate", now turn it into a 16-bit - one that uses PC autoincrement. */ - opcodep[0] = BDAP_PC_LOW + (1 << 4); - opcodep[1] &= 0xF0; - opcodep[1] |= BDAP_INCR_HIGH; - md_number_to_chars (var_partp, (long) (target_address), 2); - var_part_size = 2; - break; - - case ENCODE_RELAX (STATE_BASE_PLUS_DISP_PREFIX, STATE_DWORD): - /* We had a BDAP 16-bit "word", change the offset to a dword. */ - opcodep[0] = BDAP_PC_LOW + (2 << 4); - opcodep[1] &= 0xF0; - opcodep[1] |= BDAP_INCR_HIGH; - if (fragP->fr_symbol == NULL) - md_number_to_chars (var_partp, fragP->fr_offset, 4); - else - fix_new (fragP, var_partp - fragP->fr_literal, 4, fragP->fr_symbol, - fragP->fr_offset, 0, BFD_RELOC_32); - var_part_size = 4; - break; - - default: - BAD_CASE (fragP->fr_subtype); - break; - } - - fragP->fr_fix += var_part_size; -} - -/* Generate a short jump around a secondary jump table. - Used by md_create_long_jump. - - This used to be md_create_short_jump, but is now called from - md_create_long_jump instead, when sufficient. - since the sizes of the jumps are the same. It used to be brittle, - making possibilities for creating bad code. */ - -static void -cris_create_short_jump (storep, from_addr, to_addr, fragP, to_symbol) - char *storep; - addressT from_addr; - addressT to_addr; - fragS *fragP ATTRIBUTE_UNUSED; - symbolS *to_symbol ATTRIBUTE_UNUSED; -{ - long int distance; - - distance = to_addr - from_addr; - - if (-254 <= distance && distance <= 256) - { - /* Create a "short" short jump: "BA distance - 2". */ - storep[0] = branch_disp (distance - 2); - storep[1] = BA_QUICK_HIGH; - - /* A nop for the delay slot. */ - md_number_to_chars (storep + 2, NOP_OPCODE, 2); - - /* The extra word should be filled with something sane too. Make it - a nop to keep disassembly sane. */ - md_number_to_chars (storep + 4, NOP_OPCODE, 2); - } - else - { - /* Make it a "long" short jump: "BA (PC+)". */ - md_number_to_chars (storep, BA_PC_INCR_OPCODE, 2); - - /* ".WORD distance - 4". */ - md_number_to_chars (storep + 2, (long) (distance - 4), 2); - - /* A nop for the delay slot. */ - md_number_to_chars (storep + 4, NOP_OPCODE, 2); - } -} - -/* Generate a long jump in a secondary jump table. - - storep Where to store the jump instruction. - from_addr Address of the jump instruction. - to_addr Destination address of the jump. - fragP Which frag the destination address operand - lies in. - to_symbol Destination symbol. */ - -void -md_create_long_jump (storep, from_addr, to_addr, fragP, to_symbol) - char *storep; - addressT from_addr; - addressT to_addr; - fragS *fragP; - symbolS *to_symbol; -{ - long int distance; - - distance = to_addr - from_addr; - - if (-32763 <= distance && distance <= 32772) - { - /* Then make it a "short" long jump. */ - cris_create_short_jump (storep, from_addr, to_addr, fragP, - to_symbol); - } - else - { - /* We have a "long" long jump: "JUMP [PC+]". - Make it an "ADD [PC+],PC" if we're supposed to emit PIC code. */ - md_number_to_chars (storep, - pic ? ADD_PC_INCR_OPCODE : JUMP_PC_INCR_OPCODE, 2); - - /* Follow with a ".DWORD to_addr", PC-relative for PIC. */ - fix_new (fragP, storep + 2 - fragP->fr_literal, 4, to_symbol, - 0, pic ? 1 : 0, pic ? BFD_RELOC_32_PCREL : BFD_RELOC_32); - } -} - -/* Allocate space for the first piece of an insn, and mark it as the - start of the insn for debug-format use. */ - -static char * -cris_insn_first_word_frag () -{ - char *insnp = frag_more (2); - - /* We need to mark the start of the insn by passing dwarf2_emit_insn - the offset from the current fragment position. This must be done - after the first fragment is created but before any other fragments - (fixed or varying) are created. Note that the offset only - corresponds to the "size" of the insn for a fixed-size, - non-expanded insn. */ - if (OUTPUT_FLAVOR == bfd_target_elf_flavour) - dwarf2_emit_insn (2); - - return insnp; -} - -/* Port-specific assembler initialization. */ - -void -md_begin () -{ - const char *hashret = NULL; - int i = 0; - - /* Set up a hash table for the instructions. */ - op_hash = hash_new (); - if (op_hash == NULL) - as_fatal (_("Virtual memory exhausted")); - - while (cris_opcodes[i].name != NULL) - { - const char *name = cris_opcodes[i].name; - hashret = hash_insert (op_hash, name, (PTR) &cris_opcodes[i]); - - if (hashret != NULL && *hashret != '\0') - as_fatal (_("Can't hash `%s': %s\n"), cris_opcodes[i].name, - *hashret == 0 ? _("(unknown reason)") : hashret); - do - { - if (cris_opcodes[i].match & cris_opcodes[i].lose) - as_fatal (_("Buggy opcode: `%s' \"%s\"\n"), cris_opcodes[i].name, - cris_opcodes[i].args); - - ++i; - } - while (cris_opcodes[i].name != NULL - && strcmp (cris_opcodes[i].name, name) == 0); - } -} - -/* Assemble a source line. */ - -void -md_assemble (str) - char *str; -{ - struct cris_instruction output_instruction; - struct cris_prefix prefix; - char *opcodep; - char *p; - - know (str); - - /* Do the low-level grunt - assemble to bits and split up into a prefix - and ordinary insn. */ - cris_process_instruction (str, &output_instruction, &prefix); - - /* Handle any prefixes to the instruction. */ - switch (prefix.kind) - { - case PREFIX_NONE: - break; - - /* When the expression is unknown for a BDAP, it can need 0, 2 or 4 - extra bytes, so we handle it separately. */ - case PREFIX_BDAP_IMM: - /* We only do it if the relocation is unspecified, i.e. not a PIC - relocation. */ - if (prefix.reloc == BFD_RELOC_NONE) - { - gen_bdap (prefix.base_reg_number, &prefix.expr); - break; - } - /* Fall through. */ - case PREFIX_BDAP: - case PREFIX_BIAP: - case PREFIX_DIP: - opcodep = cris_insn_first_word_frag (); - - /* Output the prefix opcode. */ - md_number_to_chars (opcodep, (long) prefix.opcode, 2); - - /* Having a specified reloc only happens for DIP and for BDAP with - PIC operands, but it is ok to drop through here for the other - prefixes as they can have no relocs specified. */ - if (prefix.reloc != BFD_RELOC_NONE) - { - unsigned int relocsize - = (prefix.kind == PREFIX_DIP - ? 4 : cris_get_pic_reloc_size (prefix.reloc)); - - p = frag_more (relocsize); - fix_new_exp (frag_now, (p - frag_now->fr_literal), relocsize, - &prefix.expr, 0, prefix.reloc); - } - break; - - case PREFIX_PUSH: - opcodep = cris_insn_first_word_frag (); - - /* Output the prefix opcode. Being a "push", we add the negative - size of the register to "sp". */ - if (output_instruction.spec_reg != NULL) - { - /* Special register. */ - opcodep[0] = -output_instruction.spec_reg->reg_size; - } - else - { - /* General register. */ - opcodep[0] = -4; - } - opcodep[1] = (REG_SP << 4) + (BDAP_QUICK_OPCODE >> 8); - break; - - default: - BAD_CASE (prefix.kind); - } - - /* If we only had a prefix insn, we're done. */ - if (output_instruction.insn_type == CRIS_INSN_NONE) - return; - - /* Done with the prefix. Continue with the main instruction. */ - if (prefix.kind == PREFIX_NONE) - opcodep = cris_insn_first_word_frag (); - else - opcodep = frag_more (2); - - /* Output the instruction opcode. */ - md_number_to_chars (opcodep, (long) (output_instruction.opcode), 2); - - /* Output the symbol-dependent instruction stuff. */ - if (output_instruction.insn_type == CRIS_INSN_BRANCH) - { - segT to_seg = absolute_section; - int is_undefined = 0; - int length_code; - - if (output_instruction.expr.X_op != O_constant) - { - to_seg = S_GET_SEGMENT (output_instruction.expr.X_add_symbol); - - if (to_seg == undefined_section) - is_undefined = 1; - } - - if (output_instruction.expr.X_op == O_constant - || to_seg == now_seg || is_undefined) - { - /* Handle complex expressions. */ - valueT addvalue - = (output_instruction.expr.X_op_symbol != NULL - ? 0 : output_instruction.expr.X_add_number); - symbolS *sym - = (output_instruction.expr.X_op_symbol != NULL - ? make_expr_symbol (&output_instruction.expr) - : output_instruction.expr.X_add_symbol); - - /* If is_undefined, then the expression may BECOME now_seg. */ - length_code = is_undefined ? STATE_UNDF : STATE_BYTE; - - /* Make room for max ten bytes of variable length. */ - frag_var (rs_machine_dependent, 10, 0, - ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, length_code), - sym, addvalue, opcodep); - } - else - { - /* We have: to_seg != now_seg && to_seg != undefined_section. - This means it is a branch to a known symbol in another - section. Code in data? Weird but valid. Emit a 32-bit - branch. */ - char *cond_jump = frag_more (10); - - gen_cond_branch_32 (opcodep, cond_jump, frag_now, - output_instruction.expr.X_add_symbol, - (symbolS *) NULL, - output_instruction.expr.X_add_number); - } - } - else - { - if (output_instruction.imm_oprnd_size > 0) - { - /* The intruction has an immediate operand. */ - enum bfd_reloc_code_real reloc = BFD_RELOC_NONE; - - switch (output_instruction.imm_oprnd_size) - { - /* Any byte-size immediate constants are treated as - word-size. FIXME: Thus overflow check does not work - correctly. */ - - case 2: - /* Note that size-check for the explicit reloc has already - been done when we get here. */ - if (output_instruction.reloc != BFD_RELOC_NONE) - reloc = output_instruction.reloc; - else - reloc = BFD_RELOC_16; - break; - - case 4: - /* Allow a relocation specified in the operand. */ - if (output_instruction.reloc != BFD_RELOC_NONE) - reloc = output_instruction.reloc; - else - reloc = BFD_RELOC_32; - break; - - default: - BAD_CASE (output_instruction.imm_oprnd_size); - } - - p = frag_more (output_instruction.imm_oprnd_size); - fix_new_exp (frag_now, (p - frag_now->fr_literal), - output_instruction.imm_oprnd_size, - &output_instruction.expr, 0, reloc); - } - else if (output_instruction.reloc != BFD_RELOC_NONE) - { - /* An immediate operand that has a relocation and needs to be - processed further. */ - - /* It is important to use fix_new_exp here and everywhere else - (and not fix_new), as fix_new_exp can handle "difference - expressions" - where the expression contains a difference of - two symbols in the same segment. */ - fix_new_exp (frag_now, (opcodep - frag_now->fr_literal), 2, - &output_instruction.expr, 0, - output_instruction.reloc); - } - } -} - -/* Low level text-to-bits assembly. */ - -static void -cris_process_instruction (insn_text, out_insnp, prefixp) - char *insn_text; - struct cris_instruction *out_insnp; - struct cris_prefix *prefixp; -{ - char *s; - char modified_char = 0; - const char *args; - struct cris_opcode *instruction; - char *operands; - int match = 0; - int mode; - int regno; - int size_bits; - - /* Reset these fields to a harmless state in case we need to return in - error. */ - prefixp->kind = PREFIX_NONE; - prefixp->reloc = BFD_RELOC_NONE; - out_insnp->insn_type = CRIS_INSN_NORMAL; - out_insnp->imm_oprnd_size = 0; - - /* Find the end of the opcode mnemonic. We assume (true in 2.9.1) - that the caller has translated the opcode to lower-case, up to the - first non-letter. */ - for (operands = insn_text; islower (*operands); ++operands) - ; - - /* Terminate the opcode after letters, but save the character there if - it was of significance. */ - switch (*operands) - { - case '\0': - break; - - case '.': - /* Put back the modified character later. */ - modified_char = *operands; - /* Fall through. */ - - case ' ': - /* Consume the character after the mnemonic - and replace it with '\0'. */ - *operands++ = '\0'; - break; - - default: - as_bad (_("Unknown opcode: `%s'"), insn_text); - return; - } - - /* Find the instruction. */ - instruction = (struct cris_opcode *) hash_find (op_hash, insn_text); - if (instruction == NULL) - { - as_bad (_("Unknown opcode: `%s'"), insn_text); - return; - } - - /* Put back the modified character. */ - switch (modified_char) - { - case 0: - break; - - default: - *--operands = modified_char; - } - - /* Try to match an opcode table slot. */ - for (s = operands;;) - { - int imm_expr_found; - - /* Initialize *prefixp, perhaps after being modified for a - "near match". */ - prefixp->kind = PREFIX_NONE; - prefixp->reloc = BFD_RELOC_NONE; - - /* Initialize *out_insnp. */ - memset (out_insnp, 0, sizeof (*out_insnp)); - out_insnp->opcode = instruction->match; - out_insnp->reloc = BFD_RELOC_NONE; - out_insnp->insn_type = CRIS_INSN_NORMAL; - out_insnp->imm_oprnd_size = 0; - - imm_expr_found = 0; - - /* Build the opcode, checking as we go to make sure that the - operands match. */ - for (args = instruction->args;; ++args) - { - switch (*args) - { - case '\0': - /* If we've come to the end of arguments, we're done. */ - if (*s == '\0') - match = 1; - break; - - case '!': - /* Non-matcher character for disassembly. - Ignore it here. */ - continue; - - case ',': - case ' ': - /* These must match exactly. */ - if (*s++ == *args) - continue; - break; - - case 'B': - /* This is not really an operand, but causes a "BDAP - -size,SP" prefix to be output, for PUSH instructions. */ - prefixp->kind = PREFIX_PUSH; - continue; - - case 'b': - /* This letter marks an operand that should not be matched - in the assembler. It is a branch with 16-bit - displacement. The assembler will create them from the - 8-bit flavor when necessary. The assembler does not - support the [rN+] operand, as the [r15+] that is - generated for 16-bit displacements. */ - break; - - case 'c': - /* A 5-bit unsigned immediate in bits <4:0>. */ - if (! cris_get_expression (&s, &out_insnp->expr)) - break; - else - { - if (out_insnp->expr.X_op == O_constant - && (out_insnp->expr.X_add_number < 0 - || out_insnp->expr.X_add_number > 31)) - as_bad (_("Immediate value not in 5 bit unsigned range: %ld"), - out_insnp->expr.X_add_number); - - out_insnp->reloc = BFD_RELOC_CRIS_UNSIGNED_5; - continue; - } - - case 'C': - /* A 4-bit unsigned immediate in bits <3:0>. */ - if (! cris_get_expression (&s, &out_insnp->expr)) - break; - else - { - if (out_insnp->expr.X_op == O_constant - && (out_insnp->expr.X_add_number < 0 - || out_insnp->expr.X_add_number > 15)) - as_bad (_("Immediate value not in 4 bit unsigned range: %ld"), - out_insnp->expr.X_add_number); - - out_insnp->reloc = BFD_RELOC_CRIS_UNSIGNED_4; - continue; - } - - case 'D': - /* General register in bits <15:12> and <3:0>. */ - if (! get_gen_reg (&s, ®no)) - break; - else - { - out_insnp->opcode |= regno /* << 0 */; - out_insnp->opcode |= regno << 12; - continue; - } - - case 'f': - /* Flags from the condition code register. */ - { - int flags = 0; - - if (! get_flags (&s, &flags)) - break; - - out_insnp->opcode |= ((flags & 0xf0) << 8) | (flags & 0xf); - continue; - } - - case 'i': - /* A 6-bit signed immediate in bits <5:0>. */ - if (! cris_get_expression (&s, &out_insnp->expr)) - break; - else - { - if (out_insnp->expr.X_op == O_constant - && (out_insnp->expr.X_add_number < -32 - || out_insnp->expr.X_add_number > 31)) - as_bad (_("Immediate value not in 6 bit range: %ld"), - out_insnp->expr.X_add_number); - out_insnp->reloc = BFD_RELOC_CRIS_SIGNED_6; - continue; - } - - case 'I': - /* A 6-bit unsigned immediate in bits <5:0>. */ - if (! cris_get_expression (&s, &out_insnp->expr)) - break; - else - { - if (out_insnp->expr.X_op == O_constant - && (out_insnp->expr.X_add_number < 0 - || out_insnp->expr.X_add_number > 63)) - as_bad (_("Immediate value not in 6 bit unsigned range: %ld"), - out_insnp->expr.X_add_number); - out_insnp->reloc = BFD_RELOC_CRIS_UNSIGNED_6; - continue; - } - - case 'M': - /* A size modifier, B, W or D, to be put in a bit position - suitable for CLEAR instructions (i.e. reflecting a zero - register). */ - if (! get_bwd_size_modifier (&s, &size_bits)) - break; - else - { - switch (size_bits) - { - case 0: - out_insnp->opcode |= 0 << 12; - break; - - case 1: - out_insnp->opcode |= 4 << 12; - break; - - case 2: - out_insnp->opcode |= 8 << 12; - break; - } - continue; - } - - case 'm': - /* A size modifier, B, W or D, to be put in bits <5:4>. */ - if (! get_bwd_size_modifier (&s, &size_bits)) - break; - else - { - out_insnp->opcode |= size_bits << 4; - continue; - } - - case 'o': - /* A branch expression. */ - if (! cris_get_expression (&s, &out_insnp->expr)) - break; - else - { - out_insnp->insn_type = CRIS_INSN_BRANCH; - continue; - } - - case 'O': - /* A BDAP expression for any size, "expr,r". */ - if (! cris_get_expression (&s, &prefixp->expr)) - break; - else - { - if (*s != ',') - break; - - s++; - - if (!get_gen_reg (&s, &prefixp->base_reg_number)) - break; - - /* Since 'O' is used with an explicit bdap, we have no - "real" instruction. */ - prefixp->kind = PREFIX_BDAP_IMM; - prefixp->opcode - = BDAP_QUICK_OPCODE | (prefixp->base_reg_number << 12); - - out_insnp->insn_type = CRIS_INSN_NONE; - continue; - } - - case 'P': - /* Special register in bits <15:12>. */ - if (! get_spec_reg (&s, &out_insnp->spec_reg)) - break; - else - { - /* Use of some special register names come with a - specific warning. Note that we have no ".cpu type" - pseudo yet, so some of this is just unused - framework. */ - if (out_insnp->spec_reg->warning) - as_warn (out_insnp->spec_reg->warning); - else if (out_insnp->spec_reg->applicable_version - == cris_ver_warning) - /* Others have a generic warning. */ - as_warn (_("Unimplemented register `%s' specified"), - out_insnp->spec_reg->name); - - out_insnp->opcode - |= out_insnp->spec_reg->number << 12; - continue; - } - - case 'p': - /* This character is used in the disassembler to - recognize a prefix instruction to fold into the - addressing mode for the next instruction. It is - ignored here. */ - continue; - - case 'R': - /* General register in bits <15:12>. */ - if (! get_gen_reg (&s, ®no)) - break; - else - { - out_insnp->opcode |= regno << 12; - continue; - } - - case 'r': - /* General register in bits <3:0>. */ - if (! get_gen_reg (&s, ®no)) - break; - else - { - out_insnp->opcode |= regno /* << 0 */; - continue; - } - - case 'S': - /* Source operand in bit <10> and a prefix; a 3-operand - prefix. */ - if (! get_3op_or_dip_prefix_op (&s, prefixp)) - break; - else - continue; - - case 's': - /* Source operand in bits <10>, <3:0> and optionally a - prefix; i.e. an indirect operand or an side-effect - prefix. */ - if (! get_autoinc_prefix_or_indir_op (&s, prefixp, &mode, - ®no, - &imm_expr_found, - &out_insnp->expr)) - break; - else - { - if (prefixp->kind != PREFIX_NONE) - { - /* A prefix, so it has the autoincrement bit - set. */ - out_insnp->opcode |= (AUTOINCR_BIT << 8); - } - else - { - /* No prefix. The "mode" variable contains bits like - whether or not this is autoincrement mode. */ - out_insnp->opcode |= (mode << 10); - - /* If there was a PIC reloc specifier, then it was - attached to the prefix. Note that we can't check - that the reloc size matches, since we don't have - all the operands yet in all cases. */ - if (prefixp->reloc != BFD_RELOC_NONE) - out_insnp->reloc = prefixp->reloc; - } - - out_insnp->opcode |= regno /* << 0 */ ; - continue; - } - - case 'x': - /* Rs.m in bits <15:12> and <5:4>. */ - if (! get_gen_reg (&s, ®no) - || ! get_bwd_size_modifier (&s, &size_bits)) - break; - else - { - out_insnp->opcode |= (regno << 12) | (size_bits << 4); - continue; - } - - case 'y': - /* Source operand in bits <10>, <3:0> and optionally a - prefix; i.e. an indirect operand or an side-effect - prefix. - - The difference to 's' is that this does not allow an - "immediate" expression. */ - if (! get_autoinc_prefix_or_indir_op (&s, prefixp, - &mode, ®no, - &imm_expr_found, - &out_insnp->expr) - || imm_expr_found) - break; - else - { - if (prefixp->kind != PREFIX_NONE) - { - /* A prefix, and those matched here always have - side-effects (see 's' case). */ - out_insnp->opcode |= (AUTOINCR_BIT << 8); - } - else - { - /* No prefix. The "mode" variable contains bits - like whether or not this is autoincrement - mode. */ - out_insnp->opcode |= (mode << 10); - } - - out_insnp->opcode |= regno /* << 0 */; - continue; - } - - case 'z': - /* Size modifier (B or W) in bit <4>. */ - if (! get_bw_size_modifier (&s, &size_bits)) - break; - else - { - out_insnp->opcode |= size_bits << 4; - continue; - } - - default: - BAD_CASE (*args); - } - - /* We get here when we fail a match above or we found a - complete match. Break out of this loop. */ - break; - } - - /* Was it a match or a miss? */ - if (match == 0) - { - /* If it's just that the args don't match, maybe the next - item in the table is the same opcode but with - matching operands. */ - if (instruction[1].name != NULL - && ! strcmp (instruction->name, instruction[1].name)) - { - /* Yep. Restart and try that one instead. */ - ++instruction; - s = operands; - continue; - } - else - { - /* We've come to the end of instructions with this - opcode, so it must be an error. */ - as_bad (_("Illegal operands")); - return; - } - } - else - { - /* We have a match. Check if there's anything more to do. */ - if (imm_expr_found) - { - /* There was an immediate mode operand, so we must check - that it has an appropriate size. */ - switch (instruction->imm_oprnd_size) - { - default: - case SIZE_NONE: - /* Shouldn't happen; this one does not have immediate - operands with different sizes. */ - BAD_CASE (instruction->imm_oprnd_size); - break; - - case SIZE_FIX_32: - out_insnp->imm_oprnd_size = 4; - break; - - case SIZE_SPEC_REG: - switch (out_insnp->spec_reg->reg_size) - { - case 1: - if (out_insnp->expr.X_op == O_constant - && (out_insnp->expr.X_add_number < -128 - || out_insnp->expr.X_add_number > 255)) - as_bad (_("Immediate value not in 8 bit range: %ld"), - out_insnp->expr.X_add_number); - /* Fall through. */ - case 2: - /* FIXME: We need an indicator in the instruction - table to pass on, to indicate if we need to check - overflow for a signed or unsigned number. */ - if (out_insnp->expr.X_op == O_constant - && (out_insnp->expr.X_add_number < -32768 - || out_insnp->expr.X_add_number > 65535)) - as_bad (_("Immediate value not in 16 bit range: %ld"), - out_insnp->expr.X_add_number); - out_insnp->imm_oprnd_size = 2; - break; - - case 4: - out_insnp->imm_oprnd_size = 4; - break; - - default: - BAD_CASE (out_insnp->spec_reg->reg_size); - } - break; - - case SIZE_FIELD: - switch (size_bits) - { - case 0: - if (out_insnp->expr.X_op == O_constant - && (out_insnp->expr.X_add_number < -128 - || out_insnp->expr.X_add_number > 255)) - as_bad (_("Immediate value not in 8 bit range: %ld"), - out_insnp->expr.X_add_number); - /* Fall through. */ - case 1: - if (out_insnp->expr.X_op == O_constant - && (out_insnp->expr.X_add_number < -32768 - || out_insnp->expr.X_add_number > 65535)) - as_bad (_("Immediate value not in 16 bit range: %ld"), - out_insnp->expr.X_add_number); - out_insnp->imm_oprnd_size = 2; - break; - - case 2: - out_insnp->imm_oprnd_size = 4; - break; - - default: - BAD_CASE (out_insnp->spec_reg->reg_size); - } - } - - /* If there was a relocation specified for the immediate - expression (i.e. it had a PIC modifier) check that the - size of the PIC relocation matches the size specified by - the opcode. */ - if (out_insnp->reloc != BFD_RELOC_NONE - && (cris_get_pic_reloc_size (out_insnp->reloc) - != (unsigned int) out_insnp->imm_oprnd_size)) - as_bad (_("PIC relocation size does not match operand size")); - } - } - break; - } -} - -/* Get a B, W, or D size modifier from the string pointed out by *cPP, - which must point to a '.' in front of the modifier. On successful - return, *cPP is advanced to the character following the size - modifier, and is undefined otherwise. - - cPP Pointer to pointer to string starting - with the size modifier. - - size_bitsp Pointer to variable to contain the size bits on - successful return. - - Return 1 iff a correct size modifier is found, else 0. */ - -static int -get_bwd_size_modifier (cPP, size_bitsp) - char **cPP; - int *size_bitsp; -{ - if (**cPP != '.') - return 0; - else - { - /* Consume the '.'. */ - (*cPP)++; - - switch (**cPP) - { - case 'B': - case 'b': - *size_bitsp = 0; - break; - - case 'W': - case 'w': - *size_bitsp = 1; - break; - - case 'D': - case 'd': - *size_bitsp = 2; - break; - - default: - return 0; - } - - /* Consume the size letter. */ - (*cPP)++; - return 1; - } -} - -/* Get a B or W size modifier from the string pointed out by *cPP, - which must point to a '.' in front of the modifier. On successful - return, *cPP is advanced to the character following the size - modifier, and is undefined otherwise. - - cPP Pointer to pointer to string starting - with the size modifier. - - size_bitsp Pointer to variable to contain the size bits on - successful return. - - Return 1 iff a correct size modifier is found, else 0. */ - -static int -get_bw_size_modifier (cPP, size_bitsp) - char **cPP; - int *size_bitsp; -{ - if (**cPP != '.') - return 0; - else - { - /* Consume the '.'. */ - (*cPP)++; - - switch (**cPP) - { - case 'B': - case 'b': - *size_bitsp = 0; - break; - - case 'W': - case 'w': - *size_bitsp = 1; - break; - - default: - return 0; - } - - /* Consume the size letter. */ - (*cPP)++; - return 1; - } -} - -/* Get a general register from the string pointed out by *cPP. The - variable *cPP is advanced to the character following the general - register name on a successful return, and has its initial position - otherwise. - - cPP Pointer to pointer to string, beginning with a general - register name. - - regnop Pointer to int containing the register number. - - Return 1 iff a correct general register designator is found, - else 0. */ - -static int -get_gen_reg (cPP, regnop) - char **cPP; - int *regnop; -{ - char *oldp; - oldp = *cPP; - - /* Handle a sometimes-mandatory dollar sign as register prefix. */ - if (**cPP == REGISTER_PREFIX_CHAR) - (*cPP)++; - else if (demand_register_prefix) - return 0; - - switch (**cPP) - { - case 'P': - case 'p': - /* "P" as in "PC"? Consume the "P". */ - (*cPP)++; - - if ((**cPP == 'C' || **cPP == 'c') - && ! isalnum ((*cPP)[1])) - { - /* It's "PC": consume the "c" and we're done. */ - (*cPP)++; - *regnop = REG_PC; - return 1; - } - break; - - case 'R': - case 'r': - /* Hopefully r[0-9] or r1[0-5]. Consume 'R' or 'r'. */ - (*cPP)++; - - if (isdigit (**cPP)) - { - /* It's r[0-9]. Consume and check the next digit. */ - *regnop = **cPP - '0'; - (*cPP)++; - - if (! isalnum (**cPP)) - { - /* No more digits, we're done. */ - return 1; - } - else - { - /* One more digit. Consume and add. */ - *regnop = *regnop * 10 + (**cPP - '0'); - - /* We need to check for a valid register number; Rn, - 0 <= n <= MAX_REG. */ - if (*regnop <= MAX_REG) - { - /* Consume second digit. */ - (*cPP)++; - return 1; - } - } - } - break; - - case 'S': - case 's': - /* "S" as in "SP"? Consume the "S". */ - (*cPP)++; - if (**cPP == 'P' || **cPP == 'p') - { - /* It's "SP": consume the "p" and we're done. */ - (*cPP)++; - *regnop = REG_SP; - return 1; - } - break; - - default: - /* Just here to silence compilation warnings. */ - ; - } - - /* We get here if we fail. Restore the pointer. */ - *cPP = oldp; - return 0; -} - -/* Get a special register from the string pointed out by *cPP. The - variable *cPP is advanced to the character following the special - register name if one is found, and retains its original position - otherwise. - - cPP Pointer to pointer to string starting with a special register - name. - - sregpp Pointer to Pointer to struct spec_reg, where a pointer to the - register description will be stored. - - Return 1 iff a correct special register name is found. */ - -static int -get_spec_reg (cPP, sregpp) - char **cPP; - const struct cris_spec_reg **sregpp; -{ - char *s1; - const char *s2; - char *name_begin = *cPP; - - const struct cris_spec_reg *sregp; - - /* Handle a sometimes-mandatory dollar sign as register prefix. */ - if (*name_begin == REGISTER_PREFIX_CHAR) - name_begin++; - else if (demand_register_prefix) - return 0; - - /* Loop over all special registers. */ - for (sregp = cris_spec_regs; sregp->name != NULL; sregp++) - { - /* Start over from beginning of the supposed name. */ - s1 = name_begin; - s2 = sregp->name; - - while (*s2 != '\0' - && (isupper (*s1) ? tolower (*s1) == *s2 : *s1 == *s2)) - { - s1++; - s2++; - } - - /* For a match, we must have consumed the name in the table, and we - must be outside what could be part of a name. Assume here that a - test for alphanumerics is sufficient for a name test. */ - if (*s2 == 0 && ! isalnum (*s1)) - { - /* We have a match. Update the pointer and be done. */ - *cPP = s1; - *sregpp = sregp; - return 1; - } - } - - /* If we got here, we did not find any name. */ - return 0; -} - -/* Get an unprefixed or side-effect-prefix operand from the string pointed - out by *cPP. The pointer *cPP is advanced to the character following - the indirect operand if we have success, else it contains an undefined - value. - - cPP Pointer to pointer to string beginning with the first - character of the supposed operand. - - prefixp Pointer to structure containing an optional instruction - prefix. - - is_autoincp Pointer to int indicating the indirect or autoincrement - bits. - - src_regnop Pointer to int containing the source register number in - the instruction. - - imm_foundp Pointer to an int indicating if an immediate expression - is found. - - imm_exprP Pointer to a structure containing an immediate - expression, if success and if *imm_foundp is nonzero. - - Return 1 iff a correct indirect operand is found. */ - -static int -get_autoinc_prefix_or_indir_op (cPP, prefixp, is_autoincp, src_regnop, - imm_foundp, imm_exprP) - char **cPP; - struct cris_prefix *prefixp; - int *is_autoincp; - int *src_regnop; - int *imm_foundp; - expressionS *imm_exprP; -{ - /* Assume there was no immediate mode expression. */ - *imm_foundp = 0; - - if (**cPP == '[') - { - /* So this operand is one of: - Indirect: [rN] - Autoincrement: [rN+] - Indexed with assign: [rN=rM+rO.S] - Offset with assign: [rN=rM+I], [rN=rM+[rO].s], [rN=rM+[rO+].s] - - Either way, consume the '['. */ - (*cPP)++; - - /* Get the rN register. */ - if (! get_gen_reg (cPP, src_regnop)) - /* If there was no register, then this cannot match. */ - return 0; - else - { - /* We got the register, now check the next character. */ - switch (**cPP) - { - case ']': - /* Indirect mode. We're done here. */ - prefixp->kind = PREFIX_NONE; - *is_autoincp = 0; - break; - - case '+': - /* This must be an auto-increment mode, if there's a - match. */ - prefixp->kind = PREFIX_NONE; - *is_autoincp = 1; - - /* We consume this character and break out to check the - closing ']'. */ - (*cPP)++; - break; - - case '=': - /* This must be indexed with assign, or offset with assign - to match. */ - (*cPP)++; - - /* Either way, the next thing must be a register. */ - if (! get_gen_reg (cPP, &prefixp->base_reg_number)) - /* No register, no match. */ - return 0; - else - { - /* We've consumed "[rN=rM", so we must be looking at - "+rO.s]" or "+I]", or "-I]", or "+[rO].s]" or - "+[rO+].s]". */ - if (**cPP == '+') - { - int index_reg_number; - (*cPP)++; - - if (**cPP == '[') - { - int size_bits; - /* This must be [rx=ry+[rz].s] or - [rx=ry+[rz+].s] or no match. We must be - looking at rz after consuming the '['. */ - (*cPP)++; - - if (!get_gen_reg (cPP, &index_reg_number)) - return 0; - - prefixp->kind = PREFIX_BDAP; - prefixp->opcode - = (BDAP_INDIR_OPCODE - + (prefixp->base_reg_number << 12) - + index_reg_number); - - if (**cPP == '+') - { - /* We've seen "[rx=ry+[rz+" here, so now we - know that there must be "].s]" left to - check. */ - (*cPP)++; - prefixp->opcode |= AUTOINCR_BIT << 8; - } - - /* If it wasn't autoincrement, we don't need to - add anything. */ - - /* Check the next-to-last ']'. */ - if (**cPP != ']') - return 0; - - (*cPP)++; - - /* Check the ".s" modifier. */ - if (! get_bwd_size_modifier (cPP, &size_bits)) - return 0; - - prefixp->opcode |= size_bits << 4; - - /* Now we got [rx=ry+[rz+].s or [rx=ry+[rz].s. - We break out to check the final ']'. */ - break; - } - /* It wasn't an indirection. Check if it's a - register. */ - else if (get_gen_reg (cPP, &index_reg_number)) - { - int size_bits; - - /* Indexed with assign mode: "[rN+rM.S]". */ - prefixp->kind = PREFIX_BIAP; - prefixp->opcode - = (BIAP_OPCODE + (index_reg_number << 12) - + prefixp->base_reg_number /* << 0 */); - - if (! get_bwd_size_modifier (cPP, &size_bits)) - /* Size missing, this isn't a match. */ - return 0; - else - { - /* Size found, break out to check the - final ']'. */ - prefixp->opcode |= size_bits << 4; - break; - } - } - /* Not a register. Then this must be "[rN+I]". */ - else if (cris_get_expression (cPP, &prefixp->expr)) - { - /* We've got offset with assign mode. Fill - in the blanks and break out to match the - final ']'. */ - prefixp->kind = PREFIX_BDAP_IMM; - - /* We tentatively put an opcode corresponding to - a 32-bit operand here, although it may be - relaxed when there's no PIC specifier for the - operand. */ - prefixp->opcode - = (BDAP_INDIR_OPCODE - | (prefixp->base_reg_number << 12) - | (AUTOINCR_BIT << 8) - | (2 << 4) - | REG_PC /* << 0 */); - - /* This can have a PIC suffix, specifying reloc - type to use. */ - if (pic && **cPP == PIC_SUFFIX_CHAR) - { - unsigned int relocsize; - - cris_get_pic_suffix (cPP, &prefixp->reloc, - &prefixp->expr); - - /* Tweak the size of the immediate operand - in the prefix opcode if it isn't what we - set. */ - relocsize - = cris_get_pic_reloc_size (prefixp->reloc); - if (relocsize != 4) - prefixp->opcode - = ((prefixp->opcode & ~(3 << 4)) - | ((relocsize >> 1) << 4)); - } - break; - } - else - /* Neither register nor expression found, so - this can't be a match. */ - return 0; - } - /* Not "[rN+" but perhaps "[rN-"? */ - else if (**cPP == '-') - { - /* We must have an offset with assign mode. */ - if (! cris_get_expression (cPP, &prefixp->expr)) - /* No expression, no match. */ - return 0; - else - { - /* We've got offset with assign mode. Fill - in the blanks and break out to match the - final ']'. - - Note that we don't allow a PIC suffix for an - operand with a minus sign. */ - prefixp->kind = PREFIX_BDAP_IMM; - break; - } - } - else - /* Neither '+' nor '-' after "[rN=rM". Lose. */ - return 0; - } - default: - /* Neither ']' nor '+' nor '=' after "[rN". Lose. */ - return 0; - } - } - - /* When we get here, we have a match and will just check the closing - ']'. We can still fail though. */ - if (**cPP != ']') - return 0; - else - { - /* Don't forget to consume the final ']'. - Then return in glory. */ - (*cPP)++; - return 1; - } - } - /* No indirection. Perhaps a constant? */ - else if (cris_get_expression (cPP, imm_exprP)) - { - /* Expression found, this is immediate mode. */ - prefixp->kind = PREFIX_NONE; - *is_autoincp = 1; - *src_regnop = REG_PC; - *imm_foundp = 1; - - /* This can have a PIC suffix, specifying reloc type to use. The - caller must check that the reloc size matches the operand size. */ - if (pic && **cPP == PIC_SUFFIX_CHAR) - cris_get_pic_suffix (cPP, &prefixp->reloc, imm_exprP); - - return 1; - } - - /* No luck today. */ - return 0; -} - -/* This function gets an indirect operand in a three-address operand - combination from the string pointed out by *cPP. The pointer *cPP is - advanced to the character following the indirect operand on success, or - has an unspecified value on failure. - - cPP Pointer to pointer to string begining - with the operand - - prefixp Pointer to structure containing an - instruction prefix - - Returns 1 iff a correct indirect operand is found. */ - -static int -get_3op_or_dip_prefix_op (cPP, prefixp) - char **cPP; - struct cris_prefix *prefixp; -{ - int reg_number; - - if (**cPP != '[') - /* We must have a '[' or it's a clean failure. */ - return 0; - - /* Eat the first '['. */ - (*cPP)++; - - if (**cPP == '[') - { - /* A second '[', so this must be double-indirect mode. */ - (*cPP)++; - prefixp->kind = PREFIX_DIP; - prefixp->opcode = DIP_OPCODE; - - /* Get the register or fail entirely. */ - if (! get_gen_reg (cPP, ®_number)) - return 0; - else - { - prefixp->opcode |= reg_number /* << 0 */ ; - if (**cPP == '+') - { - /* Since we found a '+', this must be double-indirect - autoincrement mode. */ - (*cPP)++; - prefixp->opcode |= AUTOINCR_BIT << 8; - } - - /* There's nothing particular to do, if this was a - double-indirect *without* autoincrement. */ - } - - /* Check the first ']'. The second one is checked at the end. */ - if (**cPP != ']') - return 0; - - /* Eat the first ']', so we'll be looking at a second ']'. */ - (*cPP)++; - } - /* No second '['. Then we should have a register here, making - it "[rN". */ - else if (get_gen_reg (cPP, &prefixp->base_reg_number)) - { - /* This must be indexed or offset mode: "[rN+I]" or - "[rN+rM.S]" or "[rN+[rM].S]" or "[rN+[rM+].S]". */ - if (**cPP == '+') - { - int index_reg_number; - - (*cPP)++; - - if (**cPP == '[') - { - /* This is "[rx+["... Expect a register next. */ - int size_bits; - (*cPP)++; - - if (!get_gen_reg (cPP, &index_reg_number)) - return 0; - - prefixp->kind = PREFIX_BDAP; - prefixp->opcode - = (BDAP_INDIR_OPCODE - + (prefixp->base_reg_number << 12) - + index_reg_number); - - /* We've seen "[rx+[ry", so check if this is - autoincrement. */ - if (**cPP == '+') - { - /* Yep, now at "[rx+[ry+". */ - (*cPP)++; - prefixp->opcode |= AUTOINCR_BIT << 8; - } - /* If it wasn't autoincrement, we don't need to - add anything. */ - - /* Check a first closing ']': "[rx+[ry]" or - "[rx+[ry+]". */ - if (**cPP != ']') - return 0; - (*cPP)++; - - /* Now expect a size modifier ".S". */ - if (! get_bwd_size_modifier (cPP, &size_bits)) - return 0; - - prefixp->opcode |= size_bits << 4; - - /* Ok, all interesting stuff has been seen: - "[rx+[ry+].S" or "[rx+[ry].S". We only need to - expect a final ']', which we'll do in a common - closing session. */ - } - /* Seen "[rN+", but not a '[', so check if we have a - register. */ - else if (get_gen_reg (cPP, &index_reg_number)) - { - /* This is indexed mode: "[rN+rM.S]" or - "[rN+rM.S+]". */ - int size_bits; - prefixp->kind = PREFIX_BIAP; - prefixp->opcode - = (BIAP_OPCODE - | prefixp->base_reg_number /* << 0 */ - | (index_reg_number << 12)); - - /* Consume the ".S". */ - if (! get_bwd_size_modifier (cPP, &size_bits)) - /* Missing size, so fail. */ - return 0; - else - /* Size found. Add that piece and drop down to - the common checking of the closing ']'. */ - prefixp->opcode |= size_bits << 4; - } - /* Seen "[rN+", but not a '[' or a register, so then - it must be a constant "I". */ - else if (cris_get_expression (cPP, &prefixp->expr)) - { - /* Expression found, so fill in the bits of offset - mode and drop down to check the closing ']'. */ - prefixp->kind = PREFIX_BDAP_IMM; - - /* We tentatively put an opcode corresponding to a 32-bit - operand here, although it may be relaxed when there's no - PIC specifier for the operand. */ - prefixp->opcode - = (BDAP_INDIR_OPCODE - | (prefixp->base_reg_number << 12) - | (AUTOINCR_BIT << 8) - | (2 << 4) - | REG_PC /* << 0 */); - - /* This can have a PIC suffix, specifying reloc type to use. */ - if (pic && **cPP == PIC_SUFFIX_CHAR) - { - unsigned int relocsize; - - cris_get_pic_suffix (cPP, &prefixp->reloc, &prefixp->expr); - - /* Tweak the size of the immediate operand in the prefix - opcode if it isn't what we set. */ - relocsize = cris_get_pic_reloc_size (prefixp->reloc); - if (relocsize != 4) - prefixp->opcode - = ((prefixp->opcode & ~(3 << 4)) - | ((relocsize >> 1) << 4)); - } - } - else - /* Nothing valid here: lose. */ - return 0; - } - /* Seen "[rN" but no '+', so check if it's a '-'. */ - else if (**cPP == '-') - { - /* Yep, we must have offset mode. */ - if (! cris_get_expression (cPP, &prefixp->expr)) - /* No expression, so we lose. */ - return 0; - else - { - /* Expression found to make this offset mode, so - fill those bits and drop down to check the - closing ']'. - - Note that we don't allow a PIC suffix for - an operand with a minus sign like this. */ - prefixp->kind = PREFIX_BDAP_IMM; - } - } - else - { - /* We've seen "[rN", but not '+' or '-'; rather a ']'. - Hmm. Normally this is a simple indirect mode that we - shouldn't match, but if we expect ']', then we have a - zero offset, so it can be a three-address-operand, - like "[rN],rO,rP", thus offset mode. - - Don't eat the ']', that will be done in the closing - ceremony. */ - prefixp->expr.X_op = O_constant; - prefixp->expr.X_add_number = 0; - prefixp->expr.X_add_symbol = NULL; - prefixp->expr.X_op_symbol = NULL; - prefixp->kind = PREFIX_BDAP_IMM; - } - } - /* A '[', but no second '[', and no register. Check if we - have an expression, making this "[I]" for a double-indirect - prefix. */ - else if (cris_get_expression (cPP, &prefixp->expr)) - { - /* Expression found, the so called absolute mode for a - double-indirect prefix on PC. */ - prefixp->kind = PREFIX_DIP; - prefixp->opcode = DIP_OPCODE | (AUTOINCR_BIT << 8) | REG_PC; - prefixp->reloc = BFD_RELOC_32; - } - else - /* Neither '[' nor register nor expression. We lose. */ - return 0; - - /* We get here as a closing ceremony to a successful match. We just - need to check the closing ']'. */ - if (**cPP != ']') - /* Oops. Close but no air-polluter. */ - return 0; - - /* Don't forget to consume that ']', before returning in glory. */ - (*cPP)++; - return 1; -} - -/* Get an expression from the string pointed out by *cPP. - The pointer *cPP is advanced to the character following the expression - on a success, or retains its original value otherwise. - - cPP Pointer to pointer to string beginning with the expression. - - exprP Pointer to structure containing the expression. - - Return 1 iff a correct expression is found. */ - -static int -cris_get_expression (cPP, exprP) - char **cPP; - expressionS *exprP; -{ - char *saved_input_line_pointer; - segT exp; - - /* The "expression" function expects to find an expression at the - global variable input_line_pointer, so we have to save it to give - the impression that we don't fiddle with global variables. */ - saved_input_line_pointer = input_line_pointer; - input_line_pointer = *cPP; - - exp = expression (exprP); - if (exprP->X_op == O_illegal || exprP->X_op == O_absent) - { - input_line_pointer = saved_input_line_pointer; - return 0; - } - - /* Everything seems to be fine, just restore the global - input_line_pointer and say we're successful. */ - *cPP = input_line_pointer; - input_line_pointer = saved_input_line_pointer; - return 1; -} - -/* Get a sequence of flag characters from *spp. The pointer *cPP is - advanced to the character following the expression. The flag - characters are consecutive, no commas or spaces. - - cPP Pointer to pointer to string beginning with the expression. - - flagp Pointer to int to return the flags expression. - - Return 1 iff a correct flags expression is found. */ - -static int -get_flags (cPP, flagsp) - char **cPP; - int *flagsp; -{ - for (;;) - { - switch (**cPP) - { - case 'd': - case 'D': - case 'm': - case 'M': - *flagsp |= 0x80; - break; - - case 'e': - case 'E': - case 'b': - case 'B': - *flagsp |= 0x40; - break; - - case 'i': - case 'I': - *flagsp |= 0x20; - break; - - case 'x': - case 'X': - *flagsp |= 0x10; - break; - - case 'n': - case 'N': - *flagsp |= 0x8; - break; - - case 'z': - case 'Z': - *flagsp |= 0x4; - break; - - case 'v': - case 'V': - *flagsp |= 0x2; - break; - - case 'c': - case 'C': - *flagsp |= 1; - break; - - default: - /* We consider this successful if we stop at a comma or - whitespace. Anything else, and we consider it a failure. */ - if (**cPP != ',' - && **cPP != 0 - && ! isspace (**cPP)) - return 0; - else - return 1; - } - - /* Don't forget to consume each flag character. */ - (*cPP)++; - } -} - -/* Generate code and fixes for a BDAP prefix. - - base_regno Int containing the base register number. - - exprP Pointer to structure containing the offset expression. */ - -static void -gen_bdap (base_regno, exprP) - int base_regno; - expressionS *exprP; -{ - unsigned int opcode; - char *opcodep; - - /* Put out the prefix opcode; assume quick immediate mode at first. */ - opcode = BDAP_QUICK_OPCODE | (base_regno << 12); - opcodep = cris_insn_first_word_frag (); - md_number_to_chars (opcodep, opcode, 2); - - if (exprP->X_op == O_constant) - { - /* We have an absolute expression that we know the size of right - now. */ - long int value; - int size; - - value = exprP->X_add_number; - if (value < -32768 || value > 32767) - /* Outside range for a "word", make it a dword. */ - size = 2; - else - /* Assume "word" size. */ - size = 1; - - /* If this is a signed-byte value, we can fit it into the prefix - insn itself. */ - if (value >= -128 && value <= 127) - opcodep[0] = value; - else - { - /* This is a word or dword displacement, which will be put in a - word or dword after the prefix. */ - char *p; - - opcodep[0] = BDAP_PC_LOW + (size << 4); - opcodep[1] &= 0xF0; - opcodep[1] |= BDAP_INCR_HIGH; - p = frag_more (1 << size); - md_number_to_chars (p, value, 1 << size); - } - } - else - { - /* Handle complex expressions. */ - valueT addvalue - = exprP->X_op_symbol != NULL ? 0 : exprP->X_add_number; - symbolS *sym - = (exprP->X_op_symbol != NULL - ? make_expr_symbol (exprP) : exprP->X_add_symbol); - - /* The expression is not defined yet but may become absolute. We - make it a relocation to be relaxed. */ - frag_var (rs_machine_dependent, 4, 0, - ENCODE_RELAX (STATE_BASE_PLUS_DISP_PREFIX, STATE_UNDF), - sym, addvalue, opcodep); - } -} - -/* Encode a branch displacement in the range -256..254 into the form used - by CRIS conditional branch instructions. - - offset The displacement value in bytes. */ - -static int -branch_disp (offset) - int offset; -{ - int disp; - - disp = offset & 0xFE; - - if (offset < 0) - disp |= 1; - - return disp; -} - -/* Generate code and fixes for a 32-bit conditional branch instruction - created by "extending" an existing 8-bit branch instruction. - - opcodep Pointer to the word containing the original 8-bit branch - instruction. - - writep Pointer to "extension area" following the first instruction - word. - - fragP Pointer to the frag containing the instruction. - - add_symP, Parts of the destination address expression. - sub_symP, - add_num. */ - -static void -gen_cond_branch_32 (opcodep, writep, fragP, add_symP, sub_symP, add_num) - char *opcodep; - char *writep; - fragS *fragP; - symbolS *add_symP; - symbolS *sub_symP; - long int add_num; -{ - if (warn_for_branch_expansion) - as_warn_where (fragP->fr_file, fragP->fr_line, - _("32-bit conditional branch generated")); - - /* Here, writep points to what will be opcodep + 2. First, we change - the actual branch in opcodep[0] and opcodep[1], so that in the - final insn, it will look like: - opcodep+10: Bcc .-6 - - This means we don't have to worry about changing the opcode or - messing with the delay-slot instruction. So, we move it to last in - the "extended" branch, and just change the displacement. Admittedly, - it's not the optimal extended construct, but we should get this - rarely enough that it shouldn't matter. */ - - writep[8] = branch_disp (-2 - 6); - writep[9] = opcodep[1]; - - /* Then, we change the branch to an unconditional branch over the - extended part, to the new location of the Bcc: - opcodep: BA .+10 - opcodep+2: NOP - - Note that these two writes are to currently different locations, - merged later. */ - - md_number_to_chars (opcodep, BA_QUICK_OPCODE + 8, 2); - md_number_to_chars (writep, NOP_OPCODE, 2); - - /* Then the extended thing, the 32-bit jump insn. - opcodep+4: JUMP [PC+] - or, in the PIC case, - opcodep+4: ADD [PC+],PC. */ - - md_number_to_chars (writep + 2, - pic ? ADD_PC_INCR_OPCODE : JUMP_PC_INCR_OPCODE, 2); - - /* We have to fill in the actual value too. - opcodep+6: .DWORD - This is most probably an expression, but we can cope with an absolute - value too. FIXME: Testcase needed with and without pic. */ - - if (add_symP == NULL && sub_symP == NULL) - { - /* An absolute address. */ - if (pic) - fix_new (fragP, writep + 4 - fragP->fr_literal, 4, - section_symbol (absolute_section), - add_num, 1, BFD_RELOC_32_PCREL); - else - md_number_to_chars (writep + 4, add_num, 4); - } - else - { - if (sub_symP != NULL) - as_bad_where (fragP->fr_file, fragP->fr_line, - _("Complex expression not supported")); - - /* Not absolute, we have to make it a frag for later evaluation. */ - fix_new (fragP, writep + 4 - fragP->fr_literal, 4, add_symP, - add_num, pic ? 1 : 0, pic ? BFD_RELOC_32_PCREL : BFD_RELOC_32); - } -} - -/* Get the size of an immediate-reloc in bytes. Only valid for PIC - relocs. */ - -static unsigned int -cris_get_pic_reloc_size (reloc) - bfd_reloc_code_real_type reloc; -{ - return reloc == BFD_RELOC_CRIS_16_GOTPLT || reloc == BFD_RELOC_CRIS_16_GOT - ? 2 : 4; -} - -/* Store a reloc type at *RELOCP corresponding to the PIC suffix at *CPP. - Adjust *EXPRP with any addend found after the PIC suffix. */ - -static void -cris_get_pic_suffix (cPP, relocp, exprP) - char **cPP; - bfd_reloc_code_real_type *relocp; - expressionS *exprP; -{ - char *s = *cPP; - unsigned int i; - expressionS const_expr; - - const struct pic_suffixes_struct - { - const char *const suffix; - unsigned int len; - bfd_reloc_code_real_type reloc; - } pic_suffixes[] = - { -#undef PICMAP -#define PICMAP(s, r) {s, sizeof (s) - 1, r} - /* Keep this in order with longest unambiguous prefix first. */ - PICMAP ("GOTPLT16", BFD_RELOC_CRIS_16_GOTPLT), - PICMAP ("GOTPLT", BFD_RELOC_CRIS_32_GOTPLT), - PICMAP ("PLTG", BFD_RELOC_CRIS_32_PLT_GOTREL), - PICMAP ("PLT", BFD_RELOC_CRIS_32_PLT_PCREL), - PICMAP ("GOTOFF", BFD_RELOC_CRIS_32_GOTREL), - PICMAP ("GOT16", BFD_RELOC_CRIS_16_GOT), - PICMAP ("GOT", BFD_RELOC_CRIS_32_GOT) - }; - - /* We've already seen the ':', so consume it. */ - s++; - - for (i = 0; i < sizeof (pic_suffixes)/sizeof (pic_suffixes[0]); i++) - { - if (strncmp (s, pic_suffixes[i].suffix, pic_suffixes[i].len) == 0 - && ! is_part_of_name (s[pic_suffixes[i].len])) - { - /* We have a match. Consume the suffix and set the relocation - type. */ - s += pic_suffixes[i].len; - - /* There can be a constant term appended. If so, we will add it - to *EXPRP. */ - if (*s == '+' || *s == '-') - { - if (! cris_get_expression (&s, &const_expr)) - /* There was some kind of syntax error. Bail out. */ - break; - - /* Allow complex expressions as the constant part. It still - has to be a assembly-time constant or there will be an - error emitting the reloc. This makes the PIC qualifiers - idempotent; foo:GOTOFF+32 == foo+32:GOTOFF. The former we - recognize here; the latter is parsed in the incoming - expression. */ - exprP->X_add_symbol = make_expr_symbol (exprP); - exprP->X_op = O_add; - exprP->X_add_number = 0; - exprP->X_op_symbol = make_expr_symbol (&const_expr); - } - - *relocp = pic_suffixes[i].reloc; - *cPP = s; - return; - } - } - - /* No match. Don't consume anything; fall back and there will be a - syntax error. */ -} - -/* This *could* be: - - Turn a string in input_line_pointer into a floating point constant - of type TYPE, and store the appropriate bytes in *LITP. The number - of LITTLENUMS emitted is stored in *SIZEP. - - type A character from FLTCHARS that describes what kind of - floating-point number is wanted. - - litp A pointer to an array that the result should be stored in. - - sizep A pointer to an integer where the size of the result is stored. - - But we don't support floating point constants in assembly code *at all*, - since it's suboptimal and just opens up bug opportunities. GCC emits - the bit patterns as hex. All we could do here is to emit what GCC - would have done in the first place. *Nobody* writes floating-point - code as assembly code, but if they do, they should be able enough to - find out the correct bit patterns and use them. */ - -char * -md_atof (type, litp, sizep) - char type ATTRIBUTE_UNUSED; - char *litp ATTRIBUTE_UNUSED; - int *sizep ATTRIBUTE_UNUSED; -{ - /* FIXME: Is this function mentioned in the internals.texi manual? If - not, add it. */ - return _("Bad call to md_atof () - floating point formats are not supported"); -} - -/* Turn a number as a fixS * into a series of bytes that represents the - number on the target machine. The purpose of this procedure is the - same as that of md_number_to_chars but this procedure is supposed to - handle general bit field fixes and machine-dependent fixups. - - bufp Pointer to an array where the result should be stored. - - val The value to store. - - n The number of bytes in "val" that should be stored. - - fixP The fix to be applied to the bit field starting at bufp. - - seg The segment containing this number. */ - -static void -cris_number_to_imm (bufp, val, n, fixP, seg) - char *bufp; - long val; - int n; - fixS *fixP; - segT seg; -{ - segT sym_seg; - - know (n <= 4); - know (fixP); - - /* We put the relative "vma" for the other segment for inter-segment - relocations in the object data to stay binary "compatible" (with an - uninteresting old version) for the relocation. - Maybe delete some day. */ - if (fixP->fx_addsy - && (sym_seg = S_GET_SEGMENT (fixP->fx_addsy)) != seg) - val += sym_seg->vma; - - if (fixP->fx_addsy != NULL || fixP->fx_pcrel) - switch (fixP->fx_r_type) - { - /* These must be fully resolved when getting here. */ - case BFD_RELOC_32_PCREL: - case BFD_RELOC_16_PCREL: - case BFD_RELOC_8_PCREL: - as_bad_where (fixP->fx_frag->fr_file, fixP->fx_frag->fr_line, - _("PC-relative relocation must be trivially resolved")); - default: - ; - } - - switch (fixP->fx_r_type) - { - /* Ditto here, we put the addend into the object code as - well as the reloc addend. Keep it that way for now, to simplify - regression tests on the object file contents. FIXME: Seems - uninteresting now that we have a test suite. */ - - case BFD_RELOC_CRIS_16_GOT: - case BFD_RELOC_CRIS_32_GOT: - case BFD_RELOC_CRIS_32_GOTREL: - case BFD_RELOC_CRIS_16_GOTPLT: - case BFD_RELOC_CRIS_32_GOTPLT: - case BFD_RELOC_CRIS_32_PLT_GOTREL: - case BFD_RELOC_CRIS_32_PLT_PCREL: - /* We don't want to put in any kind of non-zero bits in the data - being relocated for these. */ - break; - - case BFD_RELOC_32: - case BFD_RELOC_32_PCREL: - /* No use having warnings here, since most hosts have a 32-bit type - for "long" (which will probably change soon, now that I wrote - this). */ - bufp[3] = (val >> 24) & 0xFF; - bufp[2] = (val >> 16) & 0xFF; - bufp[1] = (val >> 8) & 0xFF; - bufp[0] = val & 0xFF; - break; - - /* FIXME: The 16 and 8-bit cases should have a way to check - whether a signed or unsigned (or any signedness) number is - accepted. - FIXME: Does the as_bad calls find the line number by themselves, - or should we change them into as_bad_where? */ - - case BFD_RELOC_16: - case BFD_RELOC_16_PCREL: - if (val > 0xffff || val < -32768) - as_bad (_("Value not in 16 bit range: %ld"), val); - if (! fixP->fx_addsy) - { - bufp[1] = (val >> 8) & 0xFF; - bufp[0] = val & 0xFF; - } - break; - - case BFD_RELOC_8: - case BFD_RELOC_8_PCREL: - if (val > 255 || val < -128) - as_bad (_("Value not in 8 bit range: %ld"), val); - if (! fixP->fx_addsy) - bufp[0] = val & 0xFF; - break; - - case BFD_RELOC_CRIS_UNSIGNED_4: - if (val > 15 || val < 0) - as_bad (_("Value not in 4 bit unsigned range: %ld"), val); - if (! fixP->fx_addsy) - bufp[0] |= val & 0x0F; - break; - - case BFD_RELOC_CRIS_UNSIGNED_5: - if (val > 31 || val < 0) - as_bad (_("Value not in 5 bit unsigned range: %ld"), val); - if (! fixP->fx_addsy) - bufp[0] |= val & 0x1F; - break; - - case BFD_RELOC_CRIS_SIGNED_6: - if (val > 31 || val < -32) - as_bad (_("Value not in 6 bit range: %ld"), val); - if (! fixP->fx_addsy) - bufp[0] |= val & 0x3F; - break; - - case BFD_RELOC_CRIS_UNSIGNED_6: - if (val > 63 || val < 0) - as_bad (_("Value not in 6 bit unsigned range: %ld"), val); - if (! fixP->fx_addsy) - bufp[0] |= val & 0x3F; - break; - - case BFD_RELOC_CRIS_BDISP8: - if (! fixP->fx_addsy) - bufp[0] = branch_disp (val); - break; - - case BFD_RELOC_NONE: - /* May actually happen automatically. For example at broken - words, if the word turns out not to be broken. - FIXME: When? Which testcase? */ - if (! fixP->fx_addsy) - md_number_to_chars (bufp, val, n); - break; - - case BFD_RELOC_VTABLE_INHERIT: - /* This borrowed from tc-ppc.c on a whim. */ - if (fixP->fx_addsy - && !S_IS_DEFINED (fixP->fx_addsy) - && !S_IS_WEAK (fixP->fx_addsy)) - S_SET_WEAK (fixP->fx_addsy); - /* Fall through. */ - - case BFD_RELOC_VTABLE_ENTRY: - fixP->fx_done = 0; - break; - - default: - BAD_CASE (fixP->fx_r_type); - } -} - -/* Processes machine-dependent command line options. Called once for - each option on the command line that the machine-independent part of - GAS does not understand. */ - -int -md_parse_option (arg, argp) - int arg; - char *argp ATTRIBUTE_UNUSED; -{ - switch (arg) - { - case 'H': - case 'h': - printf (_("Please use --help to see usage and options for this assembler.\n")); - md_show_usage (stdout); - exit (EXIT_SUCCESS); - - case 'N': - warn_for_branch_expansion = 1; - return 1; - - case OPTION_NO_US: - demand_register_prefix = true; - - if (OUTPUT_FLAVOR == bfd_target_aout_flavour) - as_bad (_("--no-underscore is invalid with a.out format")); - else - symbols_have_leading_underscore = false; - return 1; - - case OPTION_US: - demand_register_prefix = false; - symbols_have_leading_underscore = true; - return 1; - - case OPTION_PIC: - pic = true; - return 1; - - default: - return 0; - } -} - -/* Round up a section size to the appropriate boundary. */ -valueT -md_section_align (segment, size) - segT segment; - valueT size; -{ - /* Round all sects to multiple of 4, except the bss section, which - we'll round to word-size. - - FIXME: Check if this really matters. All sections should be - rounded up, and all sections should (optionally) be assumed to be - dword-aligned, it's just that there is actual usage of linking to a - multiple of two. */ - if (OUTPUT_FLAVOR == bfd_target_aout_flavour) - { - if (segment == bss_section) - return (size + 1) & ~1; - return (size + 3) & ~3; - } - else - { - /* FIXME: Is this wanted? It matches the testsuite, but that's not - really a valid reason. */ - if (segment == text_section) - return (size + 3) & ~3; - } - - return size; -} - -/* Generate a machine-dependent relocation. */ -arelent * -tc_gen_reloc (section, fixP) - asection *section ATTRIBUTE_UNUSED; - fixS *fixP; -{ - arelent *relP; - bfd_reloc_code_real_type code; - - switch (fixP->fx_r_type) - { - case BFD_RELOC_CRIS_16_GOT: - case BFD_RELOC_CRIS_32_GOT: - case BFD_RELOC_CRIS_16_GOTPLT: - case BFD_RELOC_CRIS_32_GOTPLT: - case BFD_RELOC_CRIS_32_GOTREL: - case BFD_RELOC_CRIS_32_PLT_GOTREL: - case BFD_RELOC_CRIS_32_PLT_PCREL: - case BFD_RELOC_32: - case BFD_RELOC_16: - case BFD_RELOC_8: - case BFD_RELOC_VTABLE_INHERIT: - case BFD_RELOC_VTABLE_ENTRY: - code = fixP->fx_r_type; - break; - default: - as_bad_where (fixP->fx_file, fixP->fx_line, - _("Semantics error. This type of operand can not be relocated, it must be an assembly-time constant")); - return 0; - } - - relP = (arelent *) xmalloc (sizeof (arelent)); - assert (relP != 0); - relP->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); - *relP->sym_ptr_ptr = symbol_get_bfdsym (fixP->fx_addsy); - relP->address = fixP->fx_frag->fr_address + fixP->fx_where; - - if (fixP->fx_pcrel) - /* FIXME: Is this correct? */ - relP->addend = fixP->fx_addnumber; - else - /* At least *this one* is correct. */ - relP->addend = fixP->fx_offset; - - /* This is the standard place for KLUDGEs to work around bugs in - bfd_install_relocation (first such note in the documentation - appears with binutils-2.8). - - That function bfd_install_relocation does the wrong thing with - putting stuff into the addend of a reloc (it should stay out) for a - weak symbol. The really bad thing is that it adds the - "segment-relative offset" of the symbol into the reloc. In this - case, the reloc should instead be relative to the symbol with no - other offset than the assembly code shows; and since the symbol is - weak, any local definition should be ignored until link time (or - thereafter). - To wit: weaksym+42 should be weaksym+42 in the reloc, - not weaksym+(offset_from_segment_of_local_weaksym_definition) - - To "work around" this, we subtract the segment-relative offset of - "known" weak symbols. This evens out the extra offset. - - That happens for a.out but not for ELF, since for ELF, - bfd_install_relocation uses the "special function" field of the - howto, and does not execute the code that needs to be undone. */ - - if (OUTPUT_FLAVOR == bfd_target_aout_flavour - && fixP->fx_addsy && S_IS_WEAK (fixP->fx_addsy) - && ! bfd_is_und_section (S_GET_SEGMENT (fixP->fx_addsy))) - { - relP->addend -= S_GET_VALUE (fixP->fx_addsy); - } - - relP->howto = bfd_reloc_type_lookup (stdoutput, code); - if (! relP->howto) - { - const char *name; - - name = S_GET_NAME (fixP->fx_addsy); - if (name == NULL) - name = _("<unknown>"); - as_fatal (_("Cannot generate relocation type for symbol %s, code %s"), - name, bfd_get_reloc_code_name (code)); - } - - return relP; -} - -/* Machine-dependent usage-output. */ - -void -md_show_usage (stream) - FILE *stream; -{ - /* The messages are formatted to line up with the generic options. */ - fprintf (stream, _("CRIS-specific options:\n")); - fprintf (stream, "%s", - _(" -h, -H Don't execute, print this help text. Deprecated.\n")); - fprintf (stream, "%s", - _(" -N Warn when branches are expanded to jumps.\n")); - fprintf (stream, "%s", - _(" --underscore User symbols are normally prepended with underscore.\n")); - fprintf (stream, "%s", - _(" Registers will not need any prefix.\n")); - fprintf (stream, "%s", - _(" --no-underscore User symbols do not have any prefix.\n")); - fprintf (stream, "%s", - _(" Registers will require a `$'-prefix.\n")); - fprintf (stream, "%s", - _(" --pic Enable generation of position-independent code.\n")); -} - -/* Apply a fixS (fixup of an instruction or data that we didn't have - enough info to complete immediately) to the data in a frag. */ - -int -md_apply_fix3 (fixP, valP, seg) - fixS *fixP; - valueT *valP; - segT seg; -{ - long val = *valP; - - char *buf = fixP->fx_where + fixP->fx_frag->fr_literal; - - if (fixP->fx_addsy == 0 && !fixP->fx_pcrel) - fixP->fx_done = 1; - - if (fixP->fx_bit_fixP || fixP->fx_im_disp != 0) - { - as_bad_where (fixP->fx_file, fixP->fx_line, _("Invalid relocation")); - fixP->fx_done = 1; - } - else - { - /* I took this from tc-arc.c, since we used to not support - fx_subsy != NULL. I'm not totally sure it's TRT. */ - if (fixP->fx_subsy != (symbolS *) NULL) - { - if (S_GET_SEGMENT (fixP->fx_subsy) == absolute_section) - val -= S_GET_VALUE (fixP->fx_subsy); - else - { - /* We can't actually support subtracting a symbol. */ - as_bad_where (fixP->fx_file, fixP->fx_line, - _("expression too complex")); - } - } - - cris_number_to_imm (buf, val, fixP->fx_size, fixP, seg); - } - - return 1; -} - -/* All relocations are relative to the location just after the fixup; - the address of the fixup plus its size. */ - -long -md_pcrel_from (fixP) - fixS *fixP; -{ - valueT addr = fixP->fx_where + fixP->fx_frag->fr_address; - - /* FIXME: We get here only at the end of assembly, when X in ".-X" is - still unknown. Since we don't have pc-relative relocations in a.out, - this is invalid. What to do if anything for a.out, is to add - pc-relative relocations everywhere including the elinux program - loader. For ELF, allow straight-forward PC-relative relocations, - which are always relative to the location after the relocation. */ - if (OUTPUT_FLAVOR != bfd_target_elf_flavour - || (fixP->fx_r_type != BFD_RELOC_8_PCREL - && fixP->fx_r_type != BFD_RELOC_16_PCREL - && fixP->fx_r_type != BFD_RELOC_32_PCREL)) - as_bad_where (fixP->fx_file, fixP->fx_line, - _("Invalid pc-relative relocation")); - return fixP->fx_size + addr; -} - -/* We have no need to give defaults for symbol-values. */ -symbolS * -md_undefined_symbol (name) - char *name ATTRIBUTE_UNUSED; -{ - return 0; -} - -/* Definition of TC_FORCE_RELOCATION. - FIXME: Unsure of this. Can we omit it? Just copied from tc-i386.c - when doing multi-object format with ELF, since it's the only other - multi-object-format target with a.out and ELF. */ -int -md_cris_force_relocation (fixp) - struct fix *fixp; -{ - switch (fixp->fx_r_type) - { - case BFD_RELOC_VTABLE_INHERIT: - case BFD_RELOC_VTABLE_ENTRY: - case BFD_RELOC_CRIS_16_GOT: - case BFD_RELOC_CRIS_32_GOT: - case BFD_RELOC_CRIS_16_GOTPLT: - case BFD_RELOC_CRIS_32_GOTPLT: - case BFD_RELOC_CRIS_32_GOTREL: - case BFD_RELOC_CRIS_32_PLT_GOTREL: - case BFD_RELOC_CRIS_32_PLT_PCREL: - return 1; - default: - ; - } - - return 0; -} - -/* Check and emit error if broken-word handling has failed to fix up a - case-table. This is called from write.c, after doing everything it - knows about how to handle broken words. */ - -void -tc_cris_check_adjusted_broken_word (new_offset, brokwP) - offsetT new_offset; - struct broken_word *brokwP; -{ - if (new_offset > 32767 || new_offset < -32768) - /* We really want a genuine error, not a warning, so make it one. */ - as_bad_where (brokwP->frag->fr_file, brokwP->frag->fr_line, - _("Adjusted signed .word (%ld) overflows: `switch'-statement too large."), - (long) new_offset); -} - -/* Make a leading REGISTER_PREFIX_CHAR mandatory for all registers. */ - -static void cris_force_reg_prefix () -{ - demand_register_prefix = true; -} - -/* Do not demand a leading REGISTER_PREFIX_CHAR for all registers. */ - -static void cris_relax_reg_prefix () -{ - demand_register_prefix = false; -} - -/* Adjust for having a leading '_' on all user symbols. */ - -static void cris_sym_leading_underscore () -{ - /* We can't really do anything more than assert that what the program - thinks symbol starts with agrees with the command-line options, since - the bfd is already created. */ - - if (symbols_have_leading_underscore == false) - as_bad (_(".syntax %s requires command-line option `--underscore'"), - SYNTAX_USER_SYM_LEADING_UNDERSCORE); -} - -/* Adjust for not having any particular prefix on user symbols. */ - -static void cris_sym_no_leading_underscore () -{ - if (symbols_have_leading_underscore == true) - as_bad (_(".syntax %s requires command-line option `--no-underscore'"), - SYNTAX_USER_SYM_NO_LEADING_UNDERSCORE); -} - -/* Handle the .syntax pseudo, which takes an argument that decides what - syntax the assembly code has. */ - -static void -s_syntax (ignore) - int ignore ATTRIBUTE_UNUSED; -{ - static const struct syntaxes - { - const char *operand; - void (*fn) PARAMS ((void)); - } syntax_table[] = - {{SYNTAX_ENFORCE_REG_PREFIX, cris_force_reg_prefix}, - {SYNTAX_RELAX_REG_PREFIX, cris_relax_reg_prefix}, - {SYNTAX_USER_SYM_LEADING_UNDERSCORE, cris_sym_leading_underscore}, - {SYNTAX_USER_SYM_NO_LEADING_UNDERSCORE, cris_sym_no_leading_underscore}}; - - const struct syntaxes *sp; - - for (sp = syntax_table; - sp < syntax_table + sizeof (syntax_table) / sizeof (syntax_table[0]); - sp++) - { - if (strncmp (input_line_pointer, sp->operand, - strlen (sp->operand)) == 0) - { - (sp->fn) (); - - input_line_pointer += strlen (sp->operand); - demand_empty_rest_of_line (); - return; - } - } - - as_bad (_("Unknown .syntax operand")); -} - -/* Wrapper for dwarf2_directive_file to emit error if this is seen when - not emitting ELF. */ - -static void -s_cris_file (dummy) - int dummy; -{ - if (OUTPUT_FLAVOR != bfd_target_elf_flavour) - as_bad (_("Pseudodirective .file is only valid when generating ELF")); - else - dwarf2_directive_file (dummy); -} - -/* Wrapper for dwarf2_directive_loc to emit error if this is seen when not - emitting ELF. */ - -static void -s_cris_loc (dummy) - int dummy; -{ - if (OUTPUT_FLAVOR != bfd_target_elf_flavour) - as_bad (_("Pseudodirective .loc is only valid when generating ELF")); - else - dwarf2_directive_loc (dummy); -} - -/* - * Local variables: - * eval: (c-set-style "gnu") - * indent-tabs-mode: t - * End: - */ |