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Diffstat (limited to 'opcodes/cris-dis.c')
| -rw-r--r-- | opcodes/cris-dis.c | 1404 |
1 files changed, 0 insertions, 1404 deletions
diff --git a/opcodes/cris-dis.c b/opcodes/cris-dis.c deleted file mode 100644 index 3c8db2a1225..00000000000 --- a/opcodes/cris-dis.c +++ /dev/null @@ -1,1404 +0,0 @@ -/* Disassembler code for CRIS. - Copyright 2000 Free Software Foundation, Inc. - Contributed by Axis Communications AB, Lund, Sweden. - Written by Hans-Peter Nilsson. - -This file is part of the GNU binutils and GDB, the GNU debugger. - -This program 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 of the License, or (at your option) -any later version. - -This program 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 this program; if not, write to the Free Software -Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -#include "dis-asm.h" -#include "sysdep.h" -#include "opcode/cris.h" -#include "libiberty.h" - -/* No instruction will be disassembled longer than this. In theory, and - in silicon, address prefixes can be cascaded. In practice, cascading - is not used by GCC, and not supported by the assembler. */ -#ifndef MAX_BYTES_PER_CRIS_INSN -#define MAX_BYTES_PER_CRIS_INSN 8 -#endif - -/* Whether or not to decode prefixes, folding it into the following - instruction. FIXME: Make this optional later. */ -#ifndef PARSE_PREFIX -#define PARSE_PREFIX 1 -#endif - -/* Sometimes we prefix all registers with this character. */ -#define REGISTER_PREFIX_CHAR '$' - -/* Whether or not to trace the following sequence: - sub* X,r%d - bound* Y,r%d - adds.w [pc+r%d.w],pc - - This is the assembly form of a switch-statement in C. - The "sub is optional. If there is none, then X will be zero. - X is the value of the first case, - Y is the number of cases (including default). - - This results in case offsets printed on the form: - case N: -> case_address - where N is an estimation on the corresponding 'case' operand in C, - and case_address is where execution of that case continues after the - sequence presented above. - - The old style of output was to print the offsets as instructions, - which made it hard to follow "case"-constructs in the disassembly, - and caused a lot of annoying warnings about undefined instructions. - - FIXME: Make this optional later. */ -#ifndef TRACE_CASE -#define TRACE_CASE 1 -#endif - -/* Value of first element in switch. */ -static long case_offset = 0; - -/* How many more case-offsets to print. */ -static long case_offset_counter = 0; - -/* Number of case offsets. */ -static long no_of_case_offsets = 0; - -/* Candidate for next case_offset. */ -static long last_immediate = 0; - -static int number_of_bits PARAMS ((unsigned int)); -static char *format_hex PARAMS ((unsigned long, char *)); -static char *format_dec PARAMS ((long, char *, int)); -static char *format_reg PARAMS ((int, char *, boolean)); -static int cris_constraint PARAMS ((const char *, unsigned int, - unsigned int)); -static unsigned bytes_to_skip PARAMS ((unsigned int, - const struct cris_opcode *)); -static char *print_flags PARAMS ((unsigned int, char *)); -static void print_with_operands - PARAMS ((const struct cris_opcode *, unsigned int, unsigned char *, - bfd_vma, disassemble_info *, const struct cris_opcode *, - unsigned int, unsigned char *, boolean)); -static const struct cris_spec_reg *spec_reg_info PARAMS ((unsigned int)); -static int print_insn_cris_generic - PARAMS ((bfd_vma, disassemble_info *, boolean)); -static int print_insn_cris_with_register_prefix - PARAMS ((bfd_vma, disassemble_info *)); -static int print_insn_cris_without_register_prefix - PARAMS ((bfd_vma, disassemble_info *)); - -/* Return the descriptor of a special register. - FIXME: Depend on a CPU-version specific argument when all machinery - is in place. */ - -static const struct cris_spec_reg * -spec_reg_info (sreg) - unsigned int sreg; -{ - int i; - for (i = 0; cris_spec_regs[i].name != NULL; i++) - { - if (cris_spec_regs[i].number == sreg) - return &cris_spec_regs[i]; - } - - return NULL; -} - -/* Return the number of bits in the argument. */ - -static int -number_of_bits (val) - unsigned int val; -{ - int bits; - - for (bits = 0; val != 0; val &= val-1) - bits++; - - return bits; -} - -/* Get an entry in the opcode-table. */ - -static const struct cris_opcode * -get_opcode_entry (insn, prefix_insn) - unsigned int insn; - unsigned int prefix_insn; -{ - /* For non-prefixed insns, we keep a table of pointers, indexed by the - insn code. Each entry is initialized when found to be NULL. */ - static const struct cris_opcode **opc_table = NULL; - - const struct cris_opcode *max_matchedp = NULL; - const struct cris_opcode **prefix_opc_table = NULL; - - /* We hold a table for each prefix that need to be handled differently. */ - static const struct cris_opcode **dip_prefixes = NULL; - static const struct cris_opcode **bdapq_m1_prefixes = NULL; - static const struct cris_opcode **bdapq_m2_prefixes = NULL; - static const struct cris_opcode **bdapq_m4_prefixes = NULL; - static const struct cris_opcode **rest_prefixes = NULL; - - /* Allocate and clear the opcode-table. */ - if (opc_table == NULL) - { - opc_table = xmalloc (65536 * sizeof (opc_table[0])); - memset (opc_table, 0, 65536 * sizeof (const struct cris_opcode *)); - - dip_prefixes - = xmalloc (65536 * sizeof (const struct cris_opcode **)); - memset (dip_prefixes, 0, 65536 * sizeof (dip_prefixes[0])); - - bdapq_m1_prefixes - = xmalloc (65536 * sizeof (const struct cris_opcode **)); - memset (bdapq_m1_prefixes, 0, 65536 * sizeof (bdapq_m1_prefixes[0])); - - bdapq_m2_prefixes - = xmalloc (65536 * sizeof (const struct cris_opcode **)); - memset (bdapq_m2_prefixes, 0, 65536 * sizeof (bdapq_m2_prefixes[0])); - - bdapq_m4_prefixes - = xmalloc (65536 * sizeof (const struct cris_opcode **)); - memset (bdapq_m4_prefixes, 0, 65536 * sizeof (bdapq_m4_prefixes[0])); - - rest_prefixes - = xmalloc (65536 * sizeof (const struct cris_opcode **)); - memset (rest_prefixes, 0, 65536 * sizeof (rest_prefixes[0])); - } - - /* Get the right table if this is a prefix. - This code is connected to cris_constraints in that it knows what - prefixes play a role in recognition of patterns; the necessary - state is reflected by which table is used. If constraints - involving match or non-match of prefix insns are changed, then this - probably needs changing too. */ - if (prefix_insn != NO_CRIS_PREFIX) - { - const struct cris_opcode *popcodep - = (opc_table[prefix_insn] != NULL - ? opc_table[prefix_insn] - : get_opcode_entry (prefix_insn, NO_CRIS_PREFIX)); - - if (popcodep == NULL) - return NULL; - - if (popcodep->match == BDAP_QUICK_OPCODE) - { - /* Since some offsets are recognized with "push" macros, we - have to have different tables for them. */ - int offset = (prefix_insn & 255); - - if (offset > 127) - offset -= 256; - - switch (offset) - { - case -4: - prefix_opc_table = bdapq_m4_prefixes; - break; - - case -2: - prefix_opc_table = bdapq_m2_prefixes; - break; - - case -1: - prefix_opc_table = bdapq_m1_prefixes; - break; - - default: - prefix_opc_table = rest_prefixes; - break; - } - } - else if (popcodep->match == DIP_OPCODE) - /* We don't allow postincrement when the prefix is DIP, so use a - different table for DIP. */ - prefix_opc_table = dip_prefixes; - else - prefix_opc_table = rest_prefixes; - } - - if (prefix_insn != NO_CRIS_PREFIX - && prefix_opc_table[insn] != NULL) - max_matchedp = prefix_opc_table[insn]; - else if (prefix_insn == NO_CRIS_PREFIX && opc_table[insn] != NULL) - max_matchedp = opc_table[insn]; - else - { - const struct cris_opcode *opcodep; - int max_level_of_match = -1; - - for (opcodep = cris_opcodes; - opcodep->name != NULL; - opcodep++) - { - int level_of_match; - - /* We give a double lead for bits matching the template in - cris_opcodes. Not even, because then "move p8,r10" would - be given 2 bits lead over "clear.d r10". When there's a - tie, the first entry in the table wins. This is - deliberate, to avoid a more complicated recognition - formula. */ - if ((opcodep->match & insn) == opcodep->match - && (opcodep->lose & insn) == 0 - && ((level_of_match - = cris_constraint (opcodep->args, - insn, - prefix_insn)) - >= 0) - && ((level_of_match - += 2 * number_of_bits (opcodep->match - | opcodep->lose)) - > max_level_of_match)) - { - max_matchedp = opcodep; - max_level_of_match = level_of_match; - - /* If there was a full match, never mind looking - further. */ - if (level_of_match >= 2 * 16) - break; - } - } - /* Fill in the new entry. - - If there are changes to the opcode-table involving prefixes, and - disassembly then does not work correctly, try removing the - else-clause below that fills in the prefix-table. If that - helps, you need to change the prefix_opc_table setting above, or - something related. */ - if (prefix_insn == NO_CRIS_PREFIX) - opc_table[insn] = max_matchedp; - else - prefix_opc_table[insn] = max_matchedp; - } - - return max_matchedp; -} - -/* Format number as hex with a leading "0x" into outbuffer. */ - -static char * -format_hex (number, outbuffer) - unsigned long number; - char *outbuffer; -{ - /* Obfuscate to avoid warning on 32-bit host, but properly truncate - negative numbers on >32-bit hosts. */ - if (sizeof (number) > 4) - number &= (1 << (sizeof (number) > 4 ? 32 : 1)) - 1; - - sprintf (outbuffer, "0x%lx", number); - - /* Save this value for the "case" support. */ - if (TRACE_CASE) - last_immediate = number; - - return outbuffer + strlen (outbuffer); -} - -/* Format number as decimal into outbuffer. Parameter signedp says - whether the number should be formatted as signed (!= 0) or - unsigned (== 0). */ - -static char * -format_dec (number, outbuffer, signedp) - long number; - char *outbuffer; - int signedp; -{ - last_immediate = number; - sprintf (outbuffer, signedp ? "%ld" : "%lu", number); - - return outbuffer + strlen (outbuffer); -} - -/* Format the name of the general register regno into outbuffer. */ - -static char * -format_reg (regno, outbuffer_start, with_reg_prefix) - int regno; - char *outbuffer_start; - boolean with_reg_prefix; -{ - char *outbuffer = outbuffer_start; - - if (with_reg_prefix) - *outbuffer++ = REGISTER_PREFIX_CHAR; - - switch (regno) - { - case 15: - strcpy (outbuffer, "pc"); - break; - - case 14: - strcpy (outbuffer, "sp"); - break; - - default: - sprintf (outbuffer, "r%d", regno); - break; - } - - return outbuffer_start + strlen (outbuffer_start); -} - -/* Return -1 if the constraints of a bitwise-matched instruction say - that there is no match. Otherwise return a nonnegative number - indicating the confidence in the match (higher is better). */ - -static int -cris_constraint (cs, insn, prefix_insn) - const char *cs; - unsigned int insn; - unsigned int prefix_insn; -{ - int retval = 0; - int tmp; - int prefix_ok = 0; - - const char *s; - for (s = cs; *s; s++) - switch (*s) - { - case '!': - /* Do not recognize "pop" if there's a prefix. */ - if (prefix_insn != NO_CRIS_PREFIX) - return -1; - break; - - case 'M': - /* Size modifier for "clear", i.e. special register 0, 4 or 8. - Check that it is one of them. Only special register 12 could - be mismatched, but checking for matches is more logical than - checking for mismatches when there are only a few cases. */ - tmp = ((insn >> 12) & 0xf); - if (tmp != 0 && tmp != 4 && tmp != 8) - return -1; - break; - - case 'm': - if ((insn & 0x30) == 0x30) - return -1; - break; - - case 'S': - /* A prefix operand without side-effect. */ - if (prefix_insn != NO_CRIS_PREFIX && (insn & 0x400) == 0) - { - prefix_ok = 1; - break; - } - else - return -1; - - case 's': - case 'y': - /* If this is a prefixed insn with postincrement (side-effect), - the prefix must not be DIP. */ - if (prefix_insn != NO_CRIS_PREFIX) - { - if (insn & 0x400) - { - const struct cris_opcode *prefix_opcodep - = get_opcode_entry (prefix_insn, NO_CRIS_PREFIX); - - if (prefix_opcodep->match == DIP_OPCODE) - return -1; - } - - prefix_ok = 1; - } - break; - - case 'B': - /* If we don't fall through, then the prefix is ok. */ - prefix_ok = 1; - - /* A "push" prefix. Check for valid "push" size. - In case of special register, it may be != 4. */ - if (prefix_insn != NO_CRIS_PREFIX) - { - /* Match the prefix insn to BDAPQ. */ - const struct cris_opcode *prefix_opcodep - = get_opcode_entry (prefix_insn, NO_CRIS_PREFIX); - - if (prefix_opcodep->match == BDAP_QUICK_OPCODE) - { - int pushsize = (prefix_insn & 255); - - if (pushsize > 127) - pushsize -= 256; - - if (s[1] == 'P') - { - unsigned int spec_reg = (insn >> 12) & 15; - const struct cris_spec_reg *sregp - = spec_reg_info (spec_reg); - - /* For a special-register, the "prefix size" must - match the size of the register. */ - if (sregp && sregp->reg_size == (unsigned int) -pushsize) - break; - } - else if (s[1] == 'R') - { - if ((insn & 0x30) == 0x20 && pushsize == -4) - break; - } - /* FIXME: Should abort here; next constraint letter - *must* be 'P' or 'R'. */ - } - } - return -1; - - case 'D': - retval = (((insn >> 12) & 15) == (insn & 15)); - if (!retval) - return -1; - else - retval += 4; - break; - - case 'P': - { - const struct cris_spec_reg *sregp - = spec_reg_info ((insn >> 12) & 15); - - /* Since we match four bits, we will give a value of 4-1 = 3 - in a match. If there is a corresponding exact match of a - special register in another pattern, it will get a value of - 4, which will be higher. This should be correct in that an - exact pattern would match better than a general pattern. - - Note that there is a reason for not returning zero; the - pattern for "clear" is partly matched in the bit-pattern - (the two lower bits must be zero), while the bit-pattern - for a move from a special register is matched in the - register constraint. */ - - if (sregp != NULL) - { - retval += 3; - break; - } - else - return -1; - } - } - - if (prefix_insn != NO_CRIS_PREFIX && ! prefix_ok) - return -1; - - return retval; -} - -/* Return the length of an instruction. */ - -static unsigned -bytes_to_skip (insn, matchedp) - unsigned int insn; - const struct cris_opcode *matchedp; -{ - /* Each insn is a word plus "immediate" operands. */ - unsigned to_skip = 2; - const char *template = matchedp->args; - const char *s; - - for (s = template; *s; s++) - if (*s == 's' && (insn & 0x400) && (insn & 15) == 15) - { - /* Immediate via [pc+], so we have to check the size of the - operand. */ - int mode_size = 1 << ((insn >> 4) & (*template == 'z' ? 1 : 3)); - - if (matchedp->imm_oprnd_size == SIZE_FIX_32) - to_skip += 4; - else if (matchedp->imm_oprnd_size == SIZE_SPEC_REG) - { - const struct cris_spec_reg *sregp - = spec_reg_info ((insn >> 12) & 15); - - /* FIXME: Improve error handling; should have been caught - earlier. */ - if (sregp == NULL) - return 2; - - /* PC is incremented by two, not one, for a byte. */ - to_skip += (sregp->reg_size + 1) & ~1; - } - else - to_skip += (mode_size + 1) & ~1; - } - else if (*s == 'b') - to_skip += 2; - - return to_skip; -} - -/* Print condition code flags. */ - -static char * -print_flags (insn, cp) - unsigned int insn; - char *cp; -{ - /* Use the v8 (Etrax 100) flag definitions for disassembly. - The differences with v0 (Etrax 1..4) vs. Svinto are: - v0 'd' <=> v8 'm' - v0 'e' <=> v8 'b'. */ - static const char fnames[] = "cvznxibm"; - - unsigned char flagbits = (((insn >> 8) & 0xf0) | (insn & 15)); - int i; - - for (i = 0; i < 8; i++) - if (flagbits & (1 << i)) - *cp++ = fnames[i]; - - return cp; -} - -/* Print out an insn with its operands, and update the info->insn_type - fields. The prefix_opcodep and the rest hold a prefix insn that is - supposed to be output as an address mode. */ - -static void -print_with_operands (opcodep, insn, buffer, addr, info, prefix_opcodep, - prefix_insn, prefix_buffer, with_reg_prefix) - const struct cris_opcode *opcodep; - unsigned int insn; - unsigned char *buffer; - bfd_vma addr; - disassemble_info *info; - - /* If a prefix insn was before this insn (and is supposed to be - output as an address), here is a description of it. */ - const struct cris_opcode *prefix_opcodep; - unsigned int prefix_insn; - unsigned char *prefix_buffer; - boolean with_reg_prefix; -{ - /* Get a buffer of somewhat reasonable size where we store - intermediate parts of the insn. */ - char temp[sizeof (".d [$r13=$r12-2147483648],$r10") * 2]; - char *tp = temp; - static const char mode_char[] = "bwd?"; - const char *s; - const char *cs; - - /* Print out the name first thing we do. */ - (*info->fprintf_func) (info->stream, "%s", opcodep->name); - - cs = opcodep->args; - s = cs; - - /* Ignore any prefix indicator. */ - if (*s == 'p') - s++; - - if (*s == 'm' || *s == 'M' || *s == 'z') - { - *tp++ = '.'; - - /* Get the size-letter. */ - *tp++ = *s == 'M' - ? (insn & 0x8000 ? 'd' - : insn & 0x4000 ? 'w' : 'b') - : mode_char[(insn >> 4) & (*s == 'z' ? 1 : 3)]; - - /* Ignore the size and the space character that follows. */ - s += 2; - } - - /* Add a space if this isn't a long-branch, because for those will add - the condition part of the name later. */ - if (opcodep->match != (BRANCH_PC_LOW + BRANCH_INCR_HIGH * 256)) - *tp++ = ' '; - - /* Fill in the insn-type if deducible from the name (and there's no - better way). */ - if (opcodep->name[0] == 'j') - { - if (strncmp (opcodep->name, "jsr", 3) == 0) - /* It's "jsr" or "jsrc". */ - info->insn_type = dis_jsr; - else - /* Any other jump-type insn is considered a branch. */ - info->insn_type = dis_branch; - } - - /* We might know some more fields right now. */ - info->branch_delay_insns = opcodep->delayed; - - /* Handle operands. */ - for (; *s; s++) - { - switch (*s) - { - case ',': - *tp++ = *s; - break; - - case '!': - /* Ignore at this point; used at earlier stages to avoid recognition - if there's a prefixes at something that in other ways looks like - a "pop". */ - break; - - case 'B': - /* This was the prefix that made this a "push". We've already - handled it by recognizing it, so signal that the prefix is - handled by setting it to NULL. */ - prefix_opcodep = NULL; - break; - - case 'D': - case 'r': - tp = format_reg (insn & 15, tp, with_reg_prefix); - break; - - case 'R': - tp = format_reg ((insn >> 12) & 15, tp, with_reg_prefix); - break; - - case 'y': - case 'S': - case 's': - /* Any "normal" memory operand. */ - if ((insn & 0x400) && (insn & 15) == 15) - { - /* We're looking at [pc+], i.e. we need to output an immediate - number, where the size can depend on different things. */ - long number; - int signedp - = ((*cs == 'z' && (insn & 0x20)) - || opcodep->match == BDAP_QUICK_OPCODE); - int nbytes; - - if (opcodep->imm_oprnd_size == SIZE_FIX_32) - nbytes = 4; - else if (opcodep->imm_oprnd_size == SIZE_SPEC_REG) - { - const struct cris_spec_reg *sregp - = spec_reg_info ((insn >> 12) & 15); - - /* A NULL return should have been as a non-match earlier, - so catch it as an internal error in the error-case - below. */ - if (sregp == NULL) - /* Whatever non-valid size. */ - nbytes = 42; - else - /* PC is always incremented by a multiple of two. */ - nbytes = (sregp->reg_size + 1) & ~1; - } - else - { - int mode_size = 1 << ((insn >> 4) & (*cs == 'z' ? 1 : 3)); - - if (mode_size == 1) - nbytes = 2; - else - nbytes = mode_size; - } - - switch (nbytes) - { - case 1: - number = buffer[2]; - if (signedp && number > 127) - number -= 256; - break; - - case 2: - number = buffer[2] + buffer[3] * 256; - if (signedp && number > 32767) - number -= 65536; - break; - - case 4: - number - = buffer[2] + buffer[3] * 256 + buffer[4] * 65536 - + buffer[5] * 0x1000000; - break; - - default: - strcpy (tp, "bug"); - tp += 3; - number = 42; - } - - if ((*cs == 'z' && (insn & 0x20)) - || (opcodep->match == BDAP_QUICK_OPCODE - && (nbytes <= 2 || buffer[1 + nbytes] == 0))) - tp = format_dec (number, tp, signedp); - else - { - unsigned int highbyte = (number >> 24) & 0xff; - - /* Either output this as an address or as a number. If it's - a dword with the same high-byte as the address of the - insn, assume it's an address, and also if it's a non-zero - non-0xff high-byte. If this is a jsr or a jump, then - it's definitely an address. */ - if (nbytes == 4 - && (highbyte == ((addr >> 24) & 0xff) - || (highbyte != 0 && highbyte != 0xff) - || info->insn_type == dis_branch - || info->insn_type == dis_jsr)) - { - /* Finish off and output previous formatted bytes. */ - *tp = 0; - tp = temp; - if (temp[0]) - (*info->fprintf_func) (info->stream, "%s", temp); - - (*info->print_address_func) ((bfd_vma) number, info); - - info->target = number; - } - else - tp = format_hex (number, tp); - } - } - else - { - /* Not an immediate number. Then this is a (possibly - prefixed) memory operand. */ - if (info->insn_type != dis_nonbranch) - { - int mode_size - = 1 << ((insn >> 4) - & (opcodep->args[0] == 'z' ? 1 : 3)); - int size; - info->insn_type = dis_dref; - info->flags |= CRIS_DIS_FLAG_MEMREF; - - if (opcodep->imm_oprnd_size == SIZE_FIX_32) - size = 4; - else if (opcodep->imm_oprnd_size == SIZE_SPEC_REG) - { - const struct cris_spec_reg *sregp - = spec_reg_info ((insn >> 12) & 15); - - /* FIXME: Improve error handling; should have been caught - earlier. */ - if (sregp == NULL) - size = 4; - else - size = sregp->reg_size; - } - else - size = mode_size; - - info->data_size = size; - } - - *tp++ = '['; - - if (prefix_opcodep - /* We don't match dip with a postincremented field - as a side-effect address mode. */ - && ((insn & 0x400) == 0 - || prefix_opcodep->match != DIP_OPCODE)) - { - if (insn & 0x400) - { - tp = format_reg (insn & 15, tp, with_reg_prefix); - *tp++ = '='; - } - - - /* We mainly ignore the prefix format string when the - address-mode syntax is output. */ - switch (prefix_opcodep->match) - { - case DIP_OPCODE: - /* It's [r], [r+] or [pc+]. */ - if ((prefix_insn & 0x400) && (prefix_insn & 15) == 15) - { - /* It's [pc+]. This cannot possibly be anything - but an address. */ - unsigned long number - = prefix_buffer[2] + prefix_buffer[3] * 256 - + prefix_buffer[4] * 65536 - + prefix_buffer[5] * 0x1000000; - - info->target = (bfd_vma) number; - - /* Finish off and output previous formatted - data. */ - *tp = 0; - tp = temp; - if (temp[0]) - (*info->fprintf_func) (info->stream, "%s", temp); - - (*info->print_address_func) ((bfd_vma) number, info); - } - else - { - /* For a memref in an address, we use target2. - In this case, target is zero. */ - info->flags - |= (CRIS_DIS_FLAG_MEM_TARGET2_IS_REG - | CRIS_DIS_FLAG_MEM_TARGET2_MEM); - - info->target2 = prefix_insn & 15; - - *tp++ = '['; - tp = format_reg (prefix_insn & 15, tp, - with_reg_prefix); - if (prefix_insn & 0x400) - *tp++ = '+'; - *tp++ = ']'; - } - break; - - case BDAP_QUICK_OPCODE: - { - int number; - - number = prefix_buffer[0]; - if (number > 127) - number -= 256; - - /* Output "reg+num" or, if num < 0, "reg-num". */ - tp = format_reg ((prefix_insn >> 12) & 15, tp, - with_reg_prefix); - if (number >= 0) - *tp++ = '+'; - tp = format_dec (number, tp, 1); - - info->flags |= CRIS_DIS_FLAG_MEM_TARGET_IS_REG; - info->target = (prefix_insn >> 12) & 15; - info->target2 = (bfd_vma) number; - break; - } - - case BIAP_OPCODE: - /* Output "r+R.m". */ - tp = format_reg (prefix_insn & 15, tp, with_reg_prefix); - *tp++ = '+'; - tp = format_reg ((prefix_insn >> 12) & 15, tp, - with_reg_prefix); - *tp++ = '.'; - *tp++ = mode_char[(prefix_insn >> 4) & 3]; - - info->flags - |= (CRIS_DIS_FLAG_MEM_TARGET2_IS_REG - | CRIS_DIS_FLAG_MEM_TARGET_IS_REG - - | ((prefix_insn & 0x8000) - ? CRIS_DIS_FLAG_MEM_TARGET2_MULT4 - : ((prefix_insn & 0x8000) - ? CRIS_DIS_FLAG_MEM_TARGET2_MULT2 : 0))); - - /* Is it the casejump? It's a "adds.w [pc+r%d.w],pc". */ - if (insn == 0xf83f && (prefix_insn & ~0xf000) == 0x55f) - /* Then start interpreting data as offsets. */ - case_offset_counter = no_of_case_offsets; - break; - - case BDAP_INDIR_OPCODE: - /* Output "r+s.m", or, if "s" is [pc+], "r+s" or - "r-s". */ - tp = format_reg ((prefix_insn >> 12) & 15, tp, - with_reg_prefix); - - if ((prefix_insn & 0x400) && (prefix_insn & 15) == 15) - { - long number; - unsigned int nbytes; - - /* It's a value. Get its size. */ - int mode_size = 1 << ((prefix_insn >> 4) & 3); - - if (mode_size == 1) - nbytes = 2; - else - nbytes = mode_size; - - switch (nbytes) - { - case 1: - number = prefix_buffer[2]; - if (number > 127) - number -= 256; - break; - - case 2: - number = prefix_buffer[2] + prefix_buffer[3] * 256; - if (number > 32767) - number -= 65536; - break; - - case 4: - number - = prefix_buffer[2] + prefix_buffer[3] * 256 - + prefix_buffer[4] * 65536 - + prefix_buffer[5] * 0x1000000; - break; - - default: - strcpy (tp, "bug"); - tp += 3; - number = 42; - } - - info->flags |= CRIS_DIS_FLAG_MEM_TARGET_IS_REG; - info->target2 = (bfd_vma) number; - - /* If the size is dword, then assume it's an - address. */ - if (nbytes == 4) - { - /* Finish off and output previous formatted - bytes. */ - *tp++ = '+'; - *tp = 0; - tp = temp; - (*info->fprintf_func) (info->stream, "%s", temp); - - (*info->print_address_func) ((bfd_vma) number, info); - } - else - { - if (number >= 0) - *tp++ = '+'; - tp = format_dec (number, tp, 1); - } - } - else - { - /* Output "r+[R].m" or "r+[R+].m". */ - *tp++ = '+'; - *tp++ = '['; - tp = format_reg (prefix_insn & 15, tp, - with_reg_prefix); - if (prefix_insn & 0x400) - *tp++ = '+'; - *tp++ = ']'; - *tp++ = '.'; - *tp++ = mode_char[(prefix_insn >> 4) & 3]; - - info->flags - |= (CRIS_DIS_FLAG_MEM_TARGET2_IS_REG - | CRIS_DIS_FLAG_MEM_TARGET2_MEM - | CRIS_DIS_FLAG_MEM_TARGET_IS_REG - - | (((prefix_insn >> 4) == 2) - ? 0 - : (((prefix_insn >> 4) & 3) == 1 - ? CRIS_DIS_FLAG_MEM_TARGET2_MEM_WORD - : CRIS_DIS_FLAG_MEM_TARGET2_MEM_BYTE))); - } - break; - - default: - (*info->fprintf_func) (info->stream, "?prefix-bug"); - } - - /* To mark that the prefix is used, reset it. */ - prefix_opcodep = NULL; - } - else - { - tp = format_reg (insn & 15, tp, with_reg_prefix); - - info->flags |= CRIS_DIS_FLAG_MEM_TARGET_IS_REG; - info->target = insn & 15; - - if (insn & 0x400) - *tp++ = '+'; - } - *tp++ = ']'; - } - break; - - case 'x': - tp = format_reg ((insn >> 12) & 15, tp, with_reg_prefix); - *tp++ = '.'; - *tp++ = mode_char[(insn >> 4) & 3]; - break; - - case 'I': - tp = format_dec (insn & 63, tp, 0); - break; - - case 'b': - { - int where = buffer[2] + buffer[3] * 256; - - if (where > 32767) - where -= 65536; - - where += addr + 4; - - if (insn == BA_PC_INCR_OPCODE) - info->insn_type = dis_branch; - else - info->insn_type = dis_condbranch; - - info->target = (bfd_vma) where; - - *tp = 0; - tp = temp; - (*info->fprintf_func) (info->stream, "%s%s ", - temp, cris_cc_strings[insn >> 12]); - - (*info->print_address_func) ((bfd_vma) where, info); - } - break; - - case 'c': - tp = format_dec (insn & 31, tp, 0); - break; - - case 'C': - tp = format_dec (insn & 15, tp, 0); - break; - - case 'o': - { - long offset = insn & 0xfe; - - if (insn & 1) - offset |= ~0xff; - - if (opcodep->match == BA_QUICK_OPCODE) - info->insn_type = dis_branch; - else - info->insn_type = dis_condbranch; - - info->target = (bfd_vma) (addr + 2 + offset); - *tp = 0; - tp = temp; - (*info->fprintf_func) (info->stream, "%s", temp); - - (*info->print_address_func) ((bfd_vma) (addr + 2 + offset), info); - } - break; - - case 'O': - { - long number = buffer[0]; - - if (number > 127) - number = number - 256; - - tp = format_dec (number, tp, 1); - *tp++ = ','; - tp = format_reg ((insn >> 12) & 15, tp, with_reg_prefix); - } - break; - - case 'f': - tp = print_flags (insn, tp); - break; - - case 'i': - tp = format_dec ((insn & 32) ? (insn & 31) | ~31 : insn & 31, tp, 1); - break; - - case 'P': - { - const struct cris_spec_reg *sregp - = spec_reg_info ((insn >> 12) & 15); - - if (sregp->name == NULL) - /* Should have been caught as a non-match eariler. */ - *tp++ = '?'; - else - { - if (with_reg_prefix) - *tp++ = REGISTER_PREFIX_CHAR; - strcpy (tp, sregp->name); - tp += strlen (tp); - } - } - break; - - default: - strcpy (tp, "???"); - tp += 3; - } - } - - *tp = 0; - - if (prefix_opcodep) - (*info->fprintf_func) (info->stream, " (OOPS unused prefix \"%s: %s\")", - prefix_opcodep->name, prefix_opcodep->args); - - (*info->fprintf_func) (info->stream, "%s", temp); - - /* Get info for matching case-tables, if we don't have any active. - We assume that the last constant seen is used; either in the insn - itself or in a "move.d const,rN, sub.d rN,rM"-like sequence. */ - if (TRACE_CASE && case_offset_counter == 0) - { - if (strncmp (opcodep->name, "sub", 3) == 0) - case_offset = last_immediate; - - /* It could also be an "add", if there are negative case-values. */ - else if (strncmp (opcodep->name, "add", 3) == 0) - { - /* The first case is the negated operand to the add. */ - case_offset = -last_immediate; - } - /* A bound insn will tell us the number of cases. */ - else if (strncmp (opcodep->name, "bound", 5) == 0) - { - no_of_case_offsets = last_immediate + 1; - } - /* A jump or jsr or branch breaks the chain of insns for a - case-table, so assume default first-case again. */ - else if (info->insn_type == dis_jsr - || info->insn_type == dis_branch - || info->insn_type == dis_condbranch) - case_offset = 0; - } -} - - -/* Print the CRIS instruction at address memaddr on stream. Returns - length of the instruction, in bytes. Prefix register names with `$' if - WITH_REG_PREFIX. */ - -static int -print_insn_cris_generic (memaddr, info, with_reg_prefix) - bfd_vma memaddr; - disassemble_info *info; - boolean with_reg_prefix; -{ - int nbytes; - unsigned int insn; - const struct cris_opcode *matchedp; - int advance = 0; - - /* No instruction will be disassembled as longer than this number of - bytes; stacked prefixes will not be expanded. */ - unsigned char buffer[MAX_BYTES_PER_CRIS_INSN]; - unsigned char *bufp; - int status; - bfd_vma addr; - - /* There will be an "out of range" error after the last instruction. - Reading pairs of bytes in decreasing number, we hope that we will get - at least the amount that we will consume. - - If we can't get any data, or we do not get enough data, we print - the error message. */ - - for (nbytes = MAX_BYTES_PER_CRIS_INSN; nbytes > 0; nbytes -= 2) - { - status = (*info->read_memory_func) (memaddr, buffer, nbytes, info); - if (status == 0) - break; - } - - /* If we did not get all we asked for, then clear the rest. - Hopefully this makes a reproducible result in case of errors. */ - if (nbytes != MAX_BYTES_PER_CRIS_INSN) - memset (buffer + nbytes, 0, MAX_BYTES_PER_CRIS_INSN - nbytes); - - addr = memaddr; - bufp = buffer; - - /* Set some defaults for the insn info. */ - info->insn_info_valid = 1; - info->branch_delay_insns = 0; - info->data_size = 0; - info->insn_type = dis_nonbranch; - info->flags = 0; - info->target = 0; - info->target2 = 0; - - /* If we got any data, disassemble it. */ - if (nbytes != 0) - { - matchedp = NULL; - - insn = bufp[0] + bufp[1] * 256; - - /* If we're in a case-table, don't disassemble the offsets. */ - if (TRACE_CASE && case_offset_counter != 0) - { - info->insn_type = dis_noninsn; - advance += 2; - - /* If to print data as offsets, then shortcut here. */ - (*info->fprintf_func) (info->stream, "case %d%s: -> ", - case_offset + no_of_case_offsets - - case_offset_counter, - case_offset_counter == 1 ? "/default" : - ""); - - (*info->print_address_func) ((bfd_vma) - ((short) (insn) - + (long) (addr - - (no_of_case_offsets - - case_offset_counter) - * 2)), info); - case_offset_counter--; - - /* The default case start (without a "sub" or "add") must be - zero. */ - if (case_offset_counter == 0) - case_offset = 0; - } - else if (insn == 0) - { - /* We're often called to disassemble zeroes. While this is a - valid "bcc .+2" insn, it is also useless enough and enough - of a nuiscance that we will just output "bcc .+2" for it - and signal it as a noninsn. */ - (*info->fprintf_func) (info->stream, "bcc .+2"); - info->insn_type = dis_noninsn; - advance += 2; - } - else - { - const struct cris_opcode *prefix_opcodep = NULL; - unsigned char *prefix_buffer = bufp; - unsigned int prefix_insn = insn; - int prefix_size = 0; - - matchedp = get_opcode_entry (insn, NO_CRIS_PREFIX); - - /* Check if we're supposed to write out prefixes as address - modes and if this was a prefix. */ - if (matchedp != NULL && PARSE_PREFIX && matchedp->args[0] == 'p') - { - /* If it's a prefix, put it into the prefix vars and get the - main insn. */ - prefix_size = bytes_to_skip (prefix_insn, matchedp); - prefix_opcodep = matchedp; - - insn = bufp[prefix_size] + bufp[prefix_size + 1] * 256; - matchedp = get_opcode_entry (insn, prefix_insn); - - if (matchedp != NULL) - { - addr += prefix_size; - bufp += prefix_size; - advance += prefix_size; - } - else - { - /* The "main" insn wasn't valid, at least not when - prefixed. Put back things enough to output the - prefix insn only, as a normal insn. */ - matchedp = prefix_opcodep; - insn = prefix_insn; - prefix_opcodep = NULL; - } - } - - if (matchedp == NULL) - { - (*info->fprintf_func) (info->stream, "??0x%lx", insn); - advance += 2; - - info->insn_type = dis_noninsn; - } - else - { - advance += bytes_to_skip (insn, matchedp); - - /* The info_type and assorted fields will be set according - to the operands. */ - print_with_operands (matchedp, insn, bufp, addr, info, - prefix_opcodep, prefix_insn, - prefix_buffer, with_reg_prefix); - } - } - } - else - info->insn_type = dis_noninsn; - - /* If we read less than MAX_BYTES_PER_CRIS_INSN, i.e. we got an error - status when reading that much, and the insn decoding indicated a - length exceeding what we read, there is an error. */ - if (status != 0 && (nbytes == 0 || advance > nbytes)) - { - (*info->memory_error_func) (status, memaddr, info); - return -1; - } - - /* Max supported insn size with one folded prefix insn. */ - info->bytes_per_line = MAX_BYTES_PER_CRIS_INSN; - - /* I would like to set this to a fixed value larger than the actual - number of bytes to print in order to avoid spaces between bytes, - but objdump.c (2.9.1) does not like that, so we print 16-bit - chunks, which is the next choice. */ - info->bytes_per_chunk = 2; - - /* Printing bytes in order of increasing addresses makes sense, - especially on a little-endian target. - This is completely the opposite of what you think; setting this to - BFD_ENDIAN_LITTLE will print bytes in order N..0 rather than the 0..N - we want. */ - info->display_endian = BFD_ENDIAN_BIG; - - return advance; -} - -/* Disassemble, prefixing register names with `$'. */ - -static int -print_insn_cris_with_register_prefix (vma, info) - bfd_vma vma; - disassemble_info *info; -{ - return print_insn_cris_generic (vma, info, true); -} - -/* Disassemble, no prefixes on register names. */ - -static int -print_insn_cris_without_register_prefix (vma, info) - bfd_vma vma; - disassemble_info *info; -{ - return print_insn_cris_generic (vma, info, false); -} - -/* Return a disassembler-function that prints registers with a `$' prefix, - or one that prints registers without a prefix. */ - -disassembler_ftype -cris_get_disassembler (abfd) - bfd *abfd; -{ - /* If there's no bfd in sight, we return what is valid as input in all - contexts if fed back to the assembler: disassembly *with* register - prefix. */ - if (abfd == NULL || bfd_get_symbol_leading_char (abfd) == 0) - return print_insn_cris_with_register_prefix; - - return print_insn_cris_without_register_prefix; -} - -/* - * Local variables: - * eval: (c-set-style "gnu") - * indent-tabs-mode: t - * End: - */ |