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Diffstat (limited to 'opcodes/cris-dis.c')
| -rw-r--r-- | opcodes/cris-dis.c | 1688 |
1 files changed, 1688 insertions, 0 deletions
diff --git a/opcodes/cris-dis.c b/opcodes/cris-dis.c new file mode 100644 index 0000000..8942704 --- /dev/null +++ b/opcodes/cris-dis.c @@ -0,0 +1,1688 @@ +/* Disassembler code for CRIS. + Copyright (C) 2000-2014 Free Software Foundation, Inc. + Contributed by Axis Communications AB, Lund, Sweden. + Written by Hans-Peter Nilsson. + + This file is part of the GNU opcodes library. + + This library 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 3, or (at your option) + any later version. + + It 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., 51 Franklin Street - Fifth Floor, Boston, + MA 02110-1301, USA. */ + +#include "sysdep.h" +#include "dis-asm.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 (disdata->trace_case) +#endif + +enum cris_disass_family + { cris_dis_v0_v10, cris_dis_common_v10_v32, cris_dis_v32 }; + +/* Stored in the disasm_info->private_data member. */ +struct cris_disasm_data +{ + /* Whether to print something less confusing if we find something + matching a switch-construct. */ + bfd_boolean trace_case; + + /* Whether this code is flagged as crisv32. FIXME: Should be an enum + that includes "compatible". */ + enum cris_disass_family distype; +}; + +/* 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 cris_constraint + (const char *, unsigned, unsigned, struct cris_disasm_data *); + +/* Parse disassembler options and store state in info. FIXME: For the + time being, we abuse static variables. */ + +static bfd_boolean +cris_parse_disassembler_options (disassemble_info *info, + enum cris_disass_family distype) +{ + struct cris_disasm_data *disdata; + + info->private_data = calloc (1, sizeof (struct cris_disasm_data)); + disdata = (struct cris_disasm_data *) info->private_data; + if (disdata == NULL) + return FALSE; + + /* Default true. */ + disdata->trace_case + = (info->disassembler_options == NULL + || (strcmp (info->disassembler_options, "nocase") != 0)); + + disdata->distype = distype; + return TRUE; +} + +static const struct cris_spec_reg * +spec_reg_info (unsigned int sreg, enum cris_disass_family distype) +{ + int i; + + for (i = 0; cris_spec_regs[i].name != NULL; i++) + { + if (cris_spec_regs[i].number == sreg) + { + if (distype == cris_dis_v32) + switch (cris_spec_regs[i].applicable_version) + { + case cris_ver_warning: + case cris_ver_version_all: + case cris_ver_v3p: + case cris_ver_v8p: + case cris_ver_v10p: + case cris_ver_v32p: + /* No ambiguous sizes or register names with CRISv32. */ + if (cris_spec_regs[i].warning == NULL) + return &cris_spec_regs[i]; + default: + ; + } + else if (cris_spec_regs[i].applicable_version != cris_ver_v32p) + return &cris_spec_regs[i]; + } + } + + return NULL; +} + +/* Return the number of bits in the argument. */ + +static int +number_of_bits (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 (unsigned int insn, + unsigned int prefix_insn, + struct cris_disasm_data *disdata) +{ + /* 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 = malloc (65536 * sizeof (opc_table[0])); + if (opc_table == NULL) + return NULL; + + memset (opc_table, 0, 65536 * sizeof (const struct cris_opcode *)); + + dip_prefixes + = malloc (65536 * sizeof (const struct cris_opcode **)); + if (dip_prefixes == NULL) + return NULL; + + memset (dip_prefixes, 0, 65536 * sizeof (dip_prefixes[0])); + + bdapq_m1_prefixes + = malloc (65536 * sizeof (const struct cris_opcode **)); + if (bdapq_m1_prefixes == NULL) + return NULL; + + memset (bdapq_m1_prefixes, 0, 65536 * sizeof (bdapq_m1_prefixes[0])); + + bdapq_m2_prefixes + = malloc (65536 * sizeof (const struct cris_opcode **)); + if (bdapq_m2_prefixes == NULL) + return NULL; + + memset (bdapq_m2_prefixes, 0, 65536 * sizeof (bdapq_m2_prefixes[0])); + + bdapq_m4_prefixes + = malloc (65536 * sizeof (const struct cris_opcode **)); + if (bdapq_m4_prefixes == NULL) + return NULL; + + memset (bdapq_m4_prefixes, 0, 65536 * sizeof (bdapq_m4_prefixes[0])); + + rest_prefixes + = malloc (65536 * sizeof (const struct cris_opcode **)); + if (rest_prefixes == NULL) + return NULL; + + 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, disdata)); + + 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; + + if (disdata->distype == cris_dis_v32) + { + switch (opcodep->applicable_version) + { + case cris_ver_version_all: + break; + + case cris_ver_v0_3: + case cris_ver_v0_10: + case cris_ver_v3_10: + case cris_ver_sim_v0_10: + case cris_ver_v8_10: + case cris_ver_v10: + case cris_ver_warning: + continue; + + case cris_ver_v3p: + case cris_ver_v8p: + case cris_ver_v10p: + case cris_ver_v32p: + break; + + case cris_ver_v8: + abort (); + default: + abort (); + } + } + else + { + switch (opcodep->applicable_version) + { + case cris_ver_version_all: + case cris_ver_v0_3: + case cris_ver_v3p: + case cris_ver_v0_10: + case cris_ver_v8p: + case cris_ver_v8_10: + case cris_ver_v10: + case cris_ver_sim_v0_10: + case cris_ver_v10p: + case cris_ver_warning: + break; + + case cris_ver_v32p: + continue; + + case cris_ver_v8: + abort (); + default: + abort (); + } + } + + /* 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, + disdata)) + >= 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; +} + +/* 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 (const char *cs, + unsigned int insn, + unsigned int prefix_insn, + struct cris_disasm_data *disdata) +{ + 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 and then only for + v0..v10. */ + if (prefix_insn != NO_CRIS_PREFIX + || disdata->distype != cris_dis_v0_v10) + return -1; + break; + + case 'U': + /* Not recognized at disassembly. */ + return -1; + + 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': + 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, disdata); + + 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, disdata); + + 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, disdata->distype); + + /* 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, disdata->distype); + + /* 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; +} + +/* Format number as hex with a leading "0x" into outbuffer. */ + +static char * +format_hex (unsigned long number, + char *outbuffer, + struct cris_disasm_data *disdata) +{ + /* Truncate negative numbers on >32-bit hosts. */ + number &= 0xffffffff; + + 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 (long number, char *outbuffer, int signedp) +{ + last_immediate = number; + if (signedp) + sprintf (outbuffer, "%ld", number); + else + sprintf (outbuffer, "%lu", (unsigned long) number); + + return outbuffer + strlen (outbuffer); +} + +/* Format the name of the general register regno into outbuffer. */ + +static char * +format_reg (struct cris_disasm_data *disdata, + int regno, + char *outbuffer_start, + bfd_boolean with_reg_prefix) +{ + char *outbuffer = outbuffer_start; + + if (with_reg_prefix) + *outbuffer++ = REGISTER_PREFIX_CHAR; + + switch (regno) + { + case 15: + /* For v32, there is no context in which we output PC. */ + if (disdata->distype == cris_dis_v32) + strcpy (outbuffer, "acr"); + else + strcpy (outbuffer, "pc"); + break; + + case 14: + strcpy (outbuffer, "sp"); + break; + + default: + sprintf (outbuffer, "r%d", regno); + break; + } + + return outbuffer_start + strlen (outbuffer_start); +} + +/* Format the name of a support register into outbuffer. */ + +static char * +format_sup_reg (unsigned int regno, + char *outbuffer_start, + bfd_boolean with_reg_prefix) +{ + char *outbuffer = outbuffer_start; + int i; + + if (with_reg_prefix) + *outbuffer++ = REGISTER_PREFIX_CHAR; + + for (i = 0; cris_support_regs[i].name != NULL; i++) + if (cris_support_regs[i].number == regno) + { + sprintf (outbuffer, "%s", cris_support_regs[i].name); + return outbuffer_start + strlen (outbuffer_start); + } + + /* There's supposed to be register names covering all numbers, though + some may be generic names. */ + sprintf (outbuffer, "format_sup_reg-BUG"); + return outbuffer_start + strlen (outbuffer_start); +} + +/* Return the length of an instruction. */ + +static unsigned +bytes_to_skip (unsigned int insn, + const struct cris_opcode *matchedp, + enum cris_disass_family distype, + const struct cris_opcode *prefix_matchedp) +{ + /* Each insn is a word plus "immediate" operands. */ + unsigned to_skip = 2; + const char *template_name = (const char *) matchedp->args; + const char *s; + + for (s = template_name; *s; s++) + if ((*s == 's' || *s == 'N' || *s == 'Y') + && (insn & 0x400) && (insn & 15) == 15 + && prefix_matchedp == NULL) + { + /* Immediate via [pc+], so we have to check the size of the + operand. */ + int mode_size = 1 << ((insn >> 4) & (*template_name == '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, distype); + + /* FIXME: Improve error handling; should have been caught + earlier. */ + if (sregp == NULL) + return 2; + + /* PC is incremented by two, not one, for a byte. Except on + CRISv32, where constants are always DWORD-size for + special registers. */ + to_skip += + distype == cris_dis_v32 ? 4 : (sregp->reg_size + 1) & ~1; + } + else + to_skip += (mode_size + 1) & ~1; + } + else if (*s == 'n') + to_skip += 4; + else if (*s == 'b') + to_skip += 2; + + return to_skip; +} + +/* Print condition code flags. */ + +static char * +print_flags (struct cris_disasm_data *disdata, 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'. + FIXME: Emit v0..v3 flag names somehow. */ + static const char v8_fnames[] = "cvznxibm"; + static const char v32_fnames[] = "cvznxiup"; + const char *fnames + = disdata->distype == cris_dis_v32 ? v32_fnames : v8_fnames; + + 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 (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, + bfd_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; + struct cris_disasm_data *disdata + = (struct cris_disasm_data *) info->private_data; + + /* 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 (CONST_STRNEQ (opcodep->name, "jsr")) + /* 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 'T': + tp = format_sup_reg ((insn >> 12) & 15, tp, with_reg_prefix); + break; + + case 'A': + if (with_reg_prefix) + *tp++ = REGISTER_PREFIX_CHAR; + *tp++ = 'a'; + *tp++ = 'c'; + *tp++ = 'r'; + break; + + case '[': + case ']': + case ',': + *tp++ = *s; + break; + + case '!': + /* Ignore at this point; used at earlier stages to avoid + recognition if there's a prefix at something that in other + ways looks like a "pop". */ + break; + + case 'd': + /* Ignore. This is an optional ".d " on the large one of + relaxable insns. */ + 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 (disdata, insn & 15, tp, with_reg_prefix); + break; + + case 'R': + tp = format_reg (disdata, (insn >> 12) & 15, tp, with_reg_prefix); + break; + + case 'n': + { + /* Like N but pc-relative to the start of the insn. */ + unsigned long number + = (buffer[2] + buffer[3] * 256 + buffer[4] * 65536 + + buffer[5] * 0x1000000 + addr); + + /* Finish off and output previous formatted bytes. */ + *tp = 0; + if (temp[0]) + (*info->fprintf_func) (info->stream, "%s", temp); + tp = temp; + + (*info->print_address_func) ((bfd_vma) number, info); + } + break; + + case 'u': + { + /* Like n but the offset is bits <3:0> in the instruction. */ + unsigned long number = (buffer[0] & 0xf) * 2 + addr; + + /* Finish off and output previous formatted bytes. */ + *tp = 0; + if (temp[0]) + (*info->fprintf_func) (info->stream, "%s", temp); + tp = temp; + + (*info->print_address_func) ((bfd_vma) number, info); + } + break; + + case 'N': + case 'y': + case 'Y': + case 'S': + case 's': + /* Any "normal" memory operand. */ + if ((insn & 0x400) && (insn & 15) == 15 && prefix_opcodep == NULL) + { + /* 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, disdata->distype); + + /* 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. + For CRISv32, immediates are always 4 bytes for + special registers. */ + nbytes = disdata->distype == cris_dis_v32 + ? 4 : (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, disdata); + } + } + 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, disdata->distype); + + /* 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 (disdata, 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 (disdata, 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 (disdata, (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 (disdata, prefix_insn & 15, tp, + with_reg_prefix); + *tp++ = '+'; + tp = format_reg (disdata, (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 (disdata, (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 (disdata, 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 (disdata, 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 (disdata, (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 + ((disdata->distype == cris_dis_v32) ? 0 : 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; + bfd_vma target; + + if (insn & 1) + offset |= ~0xff; + + if (opcodep->match == BA_QUICK_OPCODE) + info->insn_type = dis_branch; + else + info->insn_type = dis_condbranch; + + target = addr + ((disdata->distype == cris_dis_v32) ? 0 : 2) + offset; + info->target = target; + *tp = 0; + tp = temp; + (*info->fprintf_func) (info->stream, "%s", temp); + (*info->print_address_func) (target, info); + } + break; + + case 'Q': + case 'O': + { + long number = buffer[0]; + + if (number > 127) + number = number - 256; + + tp = format_dec (number, tp, 1); + *tp++ = ','; + tp = format_reg (disdata, (insn >> 12) & 15, tp, with_reg_prefix); + } + break; + + case 'f': + tp = print_flags (disdata, insn, tp); + break; + + case 'i': + tp = format_dec ((insn & 32) ? (insn & 31) | ~31L : insn & 31, tp, 1); + break; + + case 'P': + { + const struct cris_spec_reg *sregp + = spec_reg_info ((insn >> 12) & 15, disdata->distype); + + 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 (CONST_STRNEQ (opcodep->name, "sub")) + case_offset = last_immediate; + + /* It could also be an "add", if there are negative case-values. */ + else if (CONST_STRNEQ (opcodep->name, "add")) + /* 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 (CONST_STRNEQ (opcodep->name, "bound")) + 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 (bfd_vma memaddr, + disassemble_info *info, + bfd_boolean with_reg_prefix) +{ + int nbytes; + unsigned int insn; + const struct cris_opcode *matchedp; + int advance = 0; + struct cris_disasm_data *disdata + = (struct cris_disasm_data *) info->private_data; + + /* 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 = 0; + 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 %ld%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, + disdata->distype == cris_dis_v32 + ? "bcc ." : "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, disdata); + + /* 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, + disdata->distype, NULL); + prefix_opcodep = matchedp; + + insn = bufp[prefix_size] + bufp[prefix_size + 1] * 256; + matchedp = get_opcode_entry (insn, prefix_insn, disdata); + + 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%x", insn); + advance += 2; + + info->insn_type = dis_noninsn; + } + else + { + advance + += bytes_to_skip (insn, matchedp, disdata->distype, + prefix_opcodep); + + /* 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 `$'. CRIS v0..v10. */ + +static int +print_insn_cris_with_register_prefix (bfd_vma vma, + disassemble_info *info) +{ + if (info->private_data == NULL + && !cris_parse_disassembler_options (info, cris_dis_v0_v10)) + return -1; + return print_insn_cris_generic (vma, info, TRUE); +} + +/* Disassemble, prefixing register names with `$'. CRIS v32. */ + +static int +print_insn_crisv32_with_register_prefix (bfd_vma vma, + disassemble_info *info) +{ + if (info->private_data == NULL + && !cris_parse_disassembler_options (info, cris_dis_v32)) + return -1; + return print_insn_cris_generic (vma, info, TRUE); +} + +/* Disassemble, prefixing register names with `$'. + Common v10 and v32 subset. */ + +static int +print_insn_crisv10_v32_with_register_prefix (bfd_vma vma, + disassemble_info *info) +{ + if (info->private_data == NULL + && !cris_parse_disassembler_options (info, cris_dis_common_v10_v32)) + return -1; + return print_insn_cris_generic (vma, info, TRUE); +} + +/* Disassemble, no prefixes on register names. CRIS v0..v10. */ + +static int +print_insn_cris_without_register_prefix (bfd_vma vma, + disassemble_info *info) +{ + if (info->private_data == NULL + && !cris_parse_disassembler_options (info, cris_dis_v0_v10)) + return -1; + return print_insn_cris_generic (vma, info, FALSE); +} + +/* Disassemble, no prefixes on register names. CRIS v32. */ + +static int +print_insn_crisv32_without_register_prefix (bfd_vma vma, + disassemble_info *info) +{ + if (info->private_data == NULL + && !cris_parse_disassembler_options (info, cris_dis_v32)) + return -1; + return print_insn_cris_generic (vma, info, FALSE); +} + +/* Disassemble, no prefixes on register names. + Common v10 and v32 subset. */ + +static int +print_insn_crisv10_v32_without_register_prefix (bfd_vma vma, + disassemble_info *info) +{ + if (info->private_data == NULL + && !cris_parse_disassembler_options (info, cris_dis_common_v10_v32)) + return -1; + 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. + FIXME: We should improve the solution to avoid the multitude of + functions seen above. */ + +disassembler_ftype +cris_get_disassembler (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. Unfortunately this will be totally wrong for v32. */ + if (abfd == NULL) + return print_insn_cris_with_register_prefix; + + if (bfd_get_symbol_leading_char (abfd) == 0) + { + if (bfd_get_mach (abfd) == bfd_mach_cris_v32) + return print_insn_crisv32_with_register_prefix; + if (bfd_get_mach (abfd) == bfd_mach_cris_v10_v32) + return print_insn_crisv10_v32_with_register_prefix; + + /* We default to v10. This may be specifically specified in the + bfd mach, but is also the default setting. */ + return print_insn_cris_with_register_prefix; + } + + if (bfd_get_mach (abfd) == bfd_mach_cris_v32) + return print_insn_crisv32_without_register_prefix; + if (bfd_get_mach (abfd) == bfd_mach_cris_v10_v32) + return print_insn_crisv10_v32_without_register_prefix; + return print_insn_cris_without_register_prefix; +} + +/* Local variables: + eval: (c-set-style "gnu") + indent-tabs-mode: t + End: */ |