| /* mmix-dis.c -- Disassemble MMIX instructions. |
| Copyright (C) 2000-2021 Free Software Foundation, Inc. |
| Written by Hans-Peter Nilsson (hp@bitrange.com) |
| |
| 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 file; see the file COPYING. If not, write to the Free |
| Software Foundation, 51 Franklin Street - Fifth Floor, Boston, |
| MA 02110-1301, USA. */ |
| |
| #include "sysdep.h" |
| #include <stdio.h> |
| #include "opcode/mmix.h" |
| #include "disassemble.h" |
| #include "libiberty.h" |
| #include "bfd.h" |
| #include "opintl.h" |
| |
| #define BAD_CASE(x) \ |
| do \ |
| { \ |
| opcodes_error_handler (_("bad case %d (%s) in %s:%d"), \ |
| x, #x, __FILE__, __LINE__); \ |
| abort (); \ |
| } \ |
| while (0) |
| |
| #define FATAL_DEBUG \ |
| do \ |
| { \ |
| opcodes_error_handler (_("internal: non-debugged code " \ |
| "(test-case missing): %s:%d"), \ |
| __FILE__, __LINE__); \ |
| abort (); \ |
| } \ |
| while (0) |
| |
| #define ROUND_MODE(n) \ |
| ((n) == 1 ? "ROUND_OFF" : (n) == 2 ? "ROUND_UP" : \ |
| (n) == 3 ? "ROUND_DOWN" : (n) == 4 ? "ROUND_NEAR" : \ |
| _("(unknown)")) |
| |
| #define INSN_IMMEDIATE_BIT (IMM_OFFSET_BIT << 24) |
| #define INSN_BACKWARD_OFFSET_BIT (1 << 24) |
| |
| #define MAX_REG_NAME_LEN 256 |
| #define MAX_SPEC_REG_NAME_LEN 32 |
| struct mmix_dis_info |
| { |
| const char *reg_name[MAX_REG_NAME_LEN]; |
| const char *spec_reg_name[MAX_SPEC_REG_NAME_LEN]; |
| |
| /* Waste a little memory so we don't have to allocate each separately. |
| We could have an array with static contents for these, but on the |
| other hand, we don't have to. */ |
| char basic_reg_name[MAX_REG_NAME_LEN][sizeof ("$255")]; |
| }; |
| |
| /* Initialize a target-specific array in INFO. */ |
| |
| static bool |
| initialize_mmix_dis_info (struct disassemble_info *info) |
| { |
| struct mmix_dis_info *minfop = malloc (sizeof (struct mmix_dis_info)); |
| long i; |
| |
| if (minfop == NULL) |
| return false; |
| |
| memset (minfop, 0, sizeof (*minfop)); |
| |
| /* Initialize register names from register symbols. If there's no |
| register section, then there are no register symbols. */ |
| if ((info->section != NULL && info->section->owner != NULL) |
| || (info->symbols != NULL |
| && info->symbols[0] != NULL |
| && bfd_asymbol_bfd (info->symbols[0]) != NULL)) |
| { |
| bfd *abfd = info->section && info->section->owner != NULL |
| ? info->section->owner |
| : bfd_asymbol_bfd (info->symbols[0]); |
| asection *reg_section = bfd_get_section_by_name (abfd, "*REG*"); |
| |
| if (reg_section != NULL) |
| { |
| /* The returned symcount *does* include the ending NULL. */ |
| long symsize = bfd_get_symtab_upper_bound (abfd); |
| asymbol **syms = malloc (symsize); |
| long nsyms; |
| |
| if (syms == NULL) |
| { |
| FATAL_DEBUG; |
| free (minfop); |
| return false; |
| } |
| nsyms = bfd_canonicalize_symtab (abfd, syms); |
| |
| /* We use the first name for a register. If this is MMO, then |
| it's the name with the first sequence number, presumably the |
| first in the source. */ |
| for (i = 0; i < nsyms && syms[i] != NULL; i++) |
| { |
| if (syms[i]->section == reg_section |
| && syms[i]->value < MAX_REG_NAME_LEN |
| && minfop->reg_name[syms[i]->value] == NULL) |
| minfop->reg_name[syms[i]->value] = syms[i]->name; |
| } |
| } |
| } |
| |
| /* Fill in the rest with the canonical names. */ |
| for (i = 0; i < MAX_REG_NAME_LEN; i++) |
| if (minfop->reg_name[i] == NULL) |
| { |
| sprintf (minfop->basic_reg_name[i], "$%ld", i); |
| minfop->reg_name[i] = minfop->basic_reg_name[i]; |
| } |
| |
| /* We assume it's actually a one-to-one mapping of number-to-name. */ |
| for (i = 0; mmix_spec_regs[i].name != NULL; i++) |
| minfop->spec_reg_name[mmix_spec_regs[i].number] = mmix_spec_regs[i].name; |
| |
| info->private_data = (void *) minfop; |
| return true; |
| } |
| |
| /* A table indexed by the first byte is constructed as we disassemble each |
| tetrabyte. The contents is a pointer into mmix_insns reflecting the |
| first found entry with matching match-bits and lose-bits. Further |
| entries are considered one after one until the operand constraints |
| match or the match-bits and lose-bits do not match. Normally a |
| "further entry" will just show that there was no other match. */ |
| |
| static const struct mmix_opcode * |
| get_opcode (unsigned long insn) |
| { |
| static const struct mmix_opcode **opcodes = NULL; |
| const struct mmix_opcode *opcodep = mmix_opcodes; |
| unsigned int opcode_part = (insn >> 24) & 255; |
| |
| if (opcodes == NULL) |
| opcodes = xcalloc (256, sizeof (struct mmix_opcode *)); |
| |
| opcodep = opcodes[opcode_part]; |
| if (opcodep == NULL |
| || (opcodep->match & insn) != opcodep->match |
| || (opcodep->lose & insn) != 0) |
| { |
| /* Search through the table. */ |
| for (opcodep = mmix_opcodes; opcodep->name != NULL; opcodep++) |
| { |
| /* FIXME: Break out this into an initialization function. */ |
| if ((opcodep->match & (opcode_part << 24)) == opcode_part |
| && (opcodep->lose & (opcode_part << 24)) == 0) |
| opcodes[opcode_part] = opcodep; |
| |
| if ((opcodep->match & insn) == opcodep->match |
| && (opcodep->lose & insn) == 0) |
| break; |
| } |
| } |
| |
| if (opcodep->name == NULL) |
| return NULL; |
| |
| /* Check constraints. If they don't match, loop through the next opcode |
| entries. */ |
| do |
| { |
| switch (opcodep->operands) |
| { |
| /* These have no restraint on what can be in the lower three |
| bytes. */ |
| case mmix_operands_regs: |
| case mmix_operands_reg_yz: |
| case mmix_operands_regs_z_opt: |
| case mmix_operands_regs_z: |
| case mmix_operands_jmp: |
| case mmix_operands_pushgo: |
| case mmix_operands_pop: |
| case mmix_operands_sync: |
| case mmix_operands_x_regs_z: |
| case mmix_operands_neg: |
| case mmix_operands_pushj: |
| case mmix_operands_regaddr: |
| case mmix_operands_get: |
| case mmix_operands_set: |
| case mmix_operands_save: |
| case mmix_operands_unsave: |
| case mmix_operands_xyz_opt: |
| return opcodep; |
| |
| /* For a ROUND_MODE, the middle byte must be 0..4. */ |
| case mmix_operands_roundregs_z: |
| case mmix_operands_roundregs: |
| { |
| int midbyte = (insn >> 8) & 255; |
| |
| if (midbyte <= 4) |
| return opcodep; |
| } |
| break; |
| |
| case mmix_operands_put: |
| /* A "PUT". If it is "immediate", then no restrictions, |
| otherwise we have to make sure the register number is < 32. */ |
| if ((insn & INSN_IMMEDIATE_BIT) |
| || ((insn >> 16) & 255) < 32) |
| return opcodep; |
| break; |
| |
| case mmix_operands_resume: |
| /* Middle bytes must be zero. */ |
| if ((insn & 0x00ffff00) == 0) |
| return opcodep; |
| break; |
| |
| default: |
| BAD_CASE (opcodep->operands); |
| } |
| |
| opcodep++; |
| } |
| while ((opcodep->match & insn) == opcodep->match |
| && (opcodep->lose & insn) == 0); |
| |
| /* If we got here, we had no match. */ |
| return NULL; |
| } |
| |
| static inline const char * |
| get_reg_name (const struct mmix_dis_info * minfop, unsigned int x) |
| { |
| if (x >= MAX_REG_NAME_LEN) |
| return _("*illegal*"); |
| return minfop->reg_name[x]; |
| } |
| |
| static inline const char * |
| get_spec_reg_name (const struct mmix_dis_info * minfop, unsigned int x) |
| { |
| if (x >= MAX_SPEC_REG_NAME_LEN) |
| return _("*illegal*"); |
| return minfop->spec_reg_name[x]; |
| } |
| |
| /* The main disassembly function. */ |
| |
| int |
| print_insn_mmix (bfd_vma memaddr, struct disassemble_info *info) |
| { |
| unsigned char buffer[4]; |
| unsigned long insn; |
| unsigned int x, y, z; |
| const struct mmix_opcode *opcodep; |
| int status = (*info->read_memory_func) (memaddr, buffer, 4, info); |
| struct mmix_dis_info *minfop; |
| |
| if (status != 0) |
| { |
| (*info->memory_error_func) (status, memaddr, info); |
| return -1; |
| } |
| |
| /* FIXME: Is -1 suitable? */ |
| if (info->private_data == NULL |
| && ! initialize_mmix_dis_info (info)) |
| return -1; |
| |
| minfop = (struct mmix_dis_info *) info->private_data; |
| x = buffer[1]; |
| y = buffer[2]; |
| z = buffer[3]; |
| |
| insn = bfd_getb32 (buffer); |
| |
| opcodep = get_opcode (insn); |
| |
| if (opcodep == NULL) |
| { |
| (*info->fprintf_func) (info->stream, _("*unknown*")); |
| return 4; |
| } |
| |
| (*info->fprintf_func) (info->stream, "%s ", opcodep->name); |
| |
| /* Present bytes in the order they are laid out in memory. */ |
| info->display_endian = BFD_ENDIAN_BIG; |
| |
| info->insn_info_valid = 1; |
| info->bytes_per_chunk = 4; |
| info->branch_delay_insns = 0; |
| info->target = 0; |
| switch (opcodep->type) |
| { |
| case mmix_type_normal: |
| case mmix_type_memaccess_block: |
| info->insn_type = dis_nonbranch; |
| break; |
| |
| case mmix_type_branch: |
| info->insn_type = dis_branch; |
| break; |
| |
| case mmix_type_condbranch: |
| info->insn_type = dis_condbranch; |
| break; |
| |
| case mmix_type_memaccess_octa: |
| info->insn_type = dis_dref; |
| info->data_size = 8; |
| break; |
| |
| case mmix_type_memaccess_tetra: |
| info->insn_type = dis_dref; |
| info->data_size = 4; |
| break; |
| |
| case mmix_type_memaccess_wyde: |
| info->insn_type = dis_dref; |
| info->data_size = 2; |
| break; |
| |
| case mmix_type_memaccess_byte: |
| info->insn_type = dis_dref; |
| info->data_size = 1; |
| break; |
| |
| case mmix_type_jsr: |
| info->insn_type = dis_jsr; |
| break; |
| |
| default: |
| BAD_CASE(opcodep->type); |
| } |
| |
| switch (opcodep->operands) |
| { |
| case mmix_operands_regs: |
| /* All registers: "$X,$Y,$Z". */ |
| (*info->fprintf_func) (info->stream, "%s,%s,%s", |
| get_reg_name (minfop, x), |
| get_reg_name (minfop, y), |
| get_reg_name (minfop, z)); |
| break; |
| |
| case mmix_operands_reg_yz: |
| /* Like SETH - "$X,YZ". */ |
| (*info->fprintf_func) (info->stream, "%s,0x%x", |
| get_reg_name (minfop, x), y * 256 + z); |
| break; |
| |
| case mmix_operands_regs_z_opt: |
| case mmix_operands_regs_z: |
| case mmix_operands_pushgo: |
| /* The regular "$X,$Y,$Z|Z". */ |
| if (insn & INSN_IMMEDIATE_BIT) |
| (*info->fprintf_func) (info->stream, "%s,%s,%d", |
| get_reg_name (minfop, x), |
| get_reg_name (minfop, y), z); |
| else |
| (*info->fprintf_func) (info->stream, "%s,%s,%s", |
| get_reg_name (minfop, x), |
| get_reg_name (minfop, y), |
| get_reg_name (minfop, z)); |
| break; |
| |
| case mmix_operands_jmp: |
| /* Address; only JMP. */ |
| { |
| bfd_signed_vma offset = (x * 65536 + y * 256 + z) * 4; |
| |
| if (insn & INSN_BACKWARD_OFFSET_BIT) |
| offset -= (256 * 65536) * 4; |
| |
| info->target = memaddr + offset; |
| (*info->print_address_func) (memaddr + offset, info); |
| } |
| break; |
| |
| case mmix_operands_roundregs_z: |
| /* Two registers, like FLOT, possibly with rounding: "$X,$Z|Z" |
| "$X,ROUND_MODE,$Z|Z". */ |
| if (y != 0) |
| { |
| if (insn & INSN_IMMEDIATE_BIT) |
| (*info->fprintf_func) (info->stream, "%s,%s,%d", |
| get_reg_name (minfop, x), |
| ROUND_MODE (y), z); |
| else |
| (*info->fprintf_func) (info->stream, "%s,%s,%s", |
| get_reg_name (minfop, x), |
| ROUND_MODE (y), |
| get_reg_name (minfop, z)); |
| } |
| else |
| { |
| if (insn & INSN_IMMEDIATE_BIT) |
| (*info->fprintf_func) (info->stream, "%s,%d", |
| get_reg_name (minfop, x), z); |
| else |
| (*info->fprintf_func) (info->stream, "%s,%s", |
| get_reg_name (minfop, x), |
| get_reg_name (minfop, z)); |
| } |
| break; |
| |
| case mmix_operands_pop: |
| /* Like POP - "X,YZ". */ |
| (*info->fprintf_func) (info->stream, "%d,%d", x, y*256 + z); |
| break; |
| |
| case mmix_operands_roundregs: |
| /* Two registers, possibly with rounding: "$X,$Z" or |
| "$X,ROUND_MODE,$Z". */ |
| if (y != 0) |
| (*info->fprintf_func) (info->stream, "%s,%s,%s", |
| get_reg_name (minfop, x), |
| ROUND_MODE (y), |
| get_reg_name (minfop, z)); |
| else |
| (*info->fprintf_func) (info->stream, "%s,%s", |
| get_reg_name (minfop, x), |
| get_reg_name (minfop, z)); |
| break; |
| |
| case mmix_operands_sync: |
| /* Like SYNC - "XYZ". */ |
| (*info->fprintf_func) (info->stream, "%u", |
| x * 65536 + y * 256 + z); |
| break; |
| |
| case mmix_operands_x_regs_z: |
| /* Like SYNCD - "X,$Y,$Z|Z". */ |
| if (insn & INSN_IMMEDIATE_BIT) |
| (*info->fprintf_func) (info->stream, "%d,%s,%d", |
| x, get_reg_name (minfop, y), z); |
| else |
| (*info->fprintf_func) (info->stream, "%d,%s,%s", |
| x, get_reg_name (minfop, y), |
| get_reg_name (minfop, z)); |
| break; |
| |
| case mmix_operands_neg: |
| /* Like NEG and NEGU - "$X,Y,$Z|Z". */ |
| if (insn & INSN_IMMEDIATE_BIT) |
| (*info->fprintf_func) (info->stream, "%s,%d,%d", |
| get_reg_name (minfop, x), y, z); |
| else |
| (*info->fprintf_func) (info->stream, "%s,%d,%s", |
| get_reg_name (minfop, x), y, |
| get_reg_name (minfop, z)); |
| break; |
| |
| case mmix_operands_pushj: |
| case mmix_operands_regaddr: |
| /* Like GETA or branches - "$X,Address". */ |
| { |
| bfd_signed_vma offset = (y * 256 + z) * 4; |
| |
| if (insn & INSN_BACKWARD_OFFSET_BIT) |
| offset -= 65536 * 4; |
| |
| info->target = memaddr + offset; |
| |
| (*info->fprintf_func) (info->stream, "%s,", get_reg_name (minfop, x)); |
| (*info->print_address_func) (memaddr + offset, info); |
| } |
| break; |
| |
| case mmix_operands_get: |
| /* GET - "X,spec_reg". */ |
| (*info->fprintf_func) (info->stream, "%s,%s", |
| get_reg_name (minfop, x), |
| get_spec_reg_name (minfop, z)); |
| break; |
| |
| case mmix_operands_put: |
| /* PUT - "spec_reg,$Z|Z". */ |
| if (insn & INSN_IMMEDIATE_BIT) |
| (*info->fprintf_func) (info->stream, "%s,%d", |
| get_spec_reg_name (minfop, x), z); |
| else |
| (*info->fprintf_func) (info->stream, "%s,%s", |
| get_spec_reg_name (minfop, x), |
| get_reg_name (minfop, z)); |
| break; |
| |
| case mmix_operands_set: |
| /* Two registers, "$X,$Y". */ |
| (*info->fprintf_func) (info->stream, "%s,%s", |
| get_reg_name (minfop, x), |
| get_reg_name (minfop, y)); |
| break; |
| |
| case mmix_operands_save: |
| /* SAVE - "$X,0". */ |
| (*info->fprintf_func) (info->stream, "%s,0", minfop->reg_name[x]); |
| break; |
| |
| case mmix_operands_unsave: |
| /* UNSAVE - "0,$Z". */ |
| (*info->fprintf_func) (info->stream, "0,%s", minfop->reg_name[z]); |
| break; |
| |
| case mmix_operands_xyz_opt: |
| /* Like SWYM or TRAP - "X,Y,Z". */ |
| (*info->fprintf_func) (info->stream, "%d,%d,%d", x, y, z); |
| break; |
| |
| case mmix_operands_resume: |
| /* Just "Z", like RESUME. */ |
| (*info->fprintf_func) (info->stream, "%d", z); |
| break; |
| |
| default: |
| (*info->fprintf_func) (info->stream, _("*unknown operands type: %d*"), |
| opcodep->operands); |
| break; |
| } |
| |
| return 4; |
| } |