| /* Instruction printing code for the AMD 29000 |
| Copyright 1990, 1993, 1994, 1995, 1998, 2000, 2001, 2002 |
| Free Software Foundation, Inc. |
| Contributed by Cygnus Support. Written by Jim Kingdon. |
| |
| This file is part of GDB. |
| |
| 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 "sysdep.h" |
| #include "dis-asm.h" |
| #include "opcode/a29k.h" |
| |
| static void print_general PARAMS ((int, struct disassemble_info *)); |
| static void print_special PARAMS ((unsigned int, struct disassemble_info *)); |
| static int is_delayed_branch PARAMS ((int)); |
| static void find_bytes_little |
| PARAMS ((char *, unsigned char *, unsigned char *, unsigned char *, |
| unsigned char *)); |
| static void find_bytes_big |
| PARAMS ((char *, unsigned char *, unsigned char *, unsigned char *, |
| unsigned char *)); |
| static int print_insn PARAMS ((bfd_vma, struct disassemble_info *)); |
| |
| |
| /* Print a symbolic representation of a general-purpose |
| register number NUM on STREAM. |
| NUM is a number as found in the instruction, not as found in |
| debugging symbols; it must be in the range 0-255. */ |
| static void |
| print_general (num, info) |
| int num; |
| struct disassemble_info *info; |
| { |
| if (num < 128) |
| (*info->fprintf_func) (info->stream, "gr%d", num); |
| else |
| (*info->fprintf_func) (info->stream, "lr%d", num - 128); |
| } |
| |
| /* Like print_general but a special-purpose register. |
| |
| The mnemonics used by the AMD assembler are not quite the same |
| as the ones in the User's Manual. We use the ones that the |
| assembler uses. */ |
| static void |
| print_special (num, info) |
| unsigned int num; |
| struct disassemble_info *info; |
| { |
| /* Register names of registers 0-SPEC0_NUM-1. */ |
| static char *spec0_names[] = { |
| "vab", "ops", "cps", "cfg", "cha", "chd", "chc", "rbp", "tmc", "tmr", |
| "pc0", "pc1", "pc2", "mmu", "lru", "rsn", "rma0", "rmc0", "rma1", "rmc1", |
| "spc0", "spc1", "spc2", "iba0", "ibc0", "iba1", "ibc1", "dba", "dbc", |
| "cir", "cdr" |
| }; |
| #define SPEC0_NUM ((sizeof spec0_names) / (sizeof spec0_names[0])) |
| |
| /* Register names of registers 128-128+SPEC128_NUM-1. */ |
| static char *spec128_names[] = { |
| "ipc", "ipa", "ipb", "q", "alu", "bp", "fc", "cr" |
| }; |
| #define SPEC128_NUM ((sizeof spec128_names) / (sizeof spec128_names[0])) |
| |
| /* Register names of registers 160-160+SPEC160_NUM-1. */ |
| static char *spec160_names[] = { |
| "fpe", "inte", "fps", "sr163", "exop" |
| }; |
| #define SPEC160_NUM ((sizeof spec160_names) / (sizeof spec160_names[0])) |
| |
| if (num < SPEC0_NUM) |
| (*info->fprintf_func) (info->stream, spec0_names[num]); |
| else if (num >= 128 && num < 128 + SPEC128_NUM) |
| (*info->fprintf_func) (info->stream, spec128_names[num-128]); |
| else if (num >= 160 && num < 160 + SPEC160_NUM) |
| (*info->fprintf_func) (info->stream, spec160_names[num-160]); |
| else |
| (*info->fprintf_func) (info->stream, "sr%d", num); |
| } |
| |
| /* Is an instruction with OPCODE a delayed branch? */ |
| static int |
| is_delayed_branch (opcode) |
| int opcode; |
| { |
| return (opcode == 0xa8 || opcode == 0xa9 || opcode == 0xa0 || opcode == 0xa1 |
| || opcode == 0xa4 || opcode == 0xa5 |
| || opcode == 0xb4 || opcode == 0xb5 |
| || opcode == 0xc4 || opcode == 0xc0 |
| || opcode == 0xac || opcode == 0xad |
| || opcode == 0xcc); |
| } |
| |
| /* Now find the four bytes of INSN and put them in *INSN{0,8,16,24}. */ |
| static void |
| find_bytes_big (insn, insn0, insn8, insn16, insn24) |
| char *insn; |
| unsigned char *insn0; |
| unsigned char *insn8; |
| unsigned char *insn16; |
| unsigned char *insn24; |
| { |
| *insn24 = insn[0]; |
| *insn16 = insn[1]; |
| *insn8 = insn[2]; |
| *insn0 = insn[3]; |
| } |
| |
| static void |
| find_bytes_little (insn, insn0, insn8, insn16, insn24) |
| char *insn; |
| unsigned char *insn0; |
| unsigned char *insn8; |
| unsigned char *insn16; |
| unsigned char *insn24; |
| { |
| *insn24 = insn[3]; |
| *insn16 = insn[2]; |
| *insn8 = insn[1]; |
| *insn0 = insn[0]; |
| } |
| |
| typedef void (*find_byte_func_type) |
| PARAMS ((char *, unsigned char *, unsigned char *, |
| unsigned char *, unsigned char *)); |
| |
| /* Print one instruction from MEMADDR on INFO->STREAM. |
| Return the size of the instruction (always 4 on a29k). */ |
| |
| static int |
| print_insn (memaddr, info) |
| bfd_vma memaddr; |
| struct disassemble_info *info; |
| { |
| /* The raw instruction. */ |
| char insn[4]; |
| |
| /* The four bytes of the instruction. */ |
| unsigned char insn24, insn16, insn8, insn0; |
| |
| find_byte_func_type find_byte_func = (find_byte_func_type)info->private_data; |
| |
| struct a29k_opcode const * opcode; |
| |
| { |
| int status = |
| (*info->read_memory_func) (memaddr, (bfd_byte *) &insn[0], 4, info); |
| if (status != 0) |
| { |
| (*info->memory_error_func) (status, memaddr, info); |
| return -1; |
| } |
| } |
| |
| (*find_byte_func) (insn, &insn0, &insn8, &insn16, &insn24); |
| |
| printf ("%02x%02x%02x%02x ", insn24, insn16, insn8, insn0); |
| |
| /* Handle the nop (aseq 0x40,gr1,gr1) specially */ |
| if ((insn24==0x70) && (insn16==0x40) && (insn8==0x01) && (insn0==0x01)) { |
| (*info->fprintf_func) (info->stream,"nop"); |
| return 4; |
| } |
| |
| /* The opcode is always in insn24. */ |
| for (opcode = &a29k_opcodes[0]; |
| opcode < &a29k_opcodes[num_opcodes]; |
| ++opcode) |
| { |
| if (((unsigned long) insn24 << 24) == opcode->opcode) |
| { |
| char *s; |
| |
| (*info->fprintf_func) (info->stream, "%s ", opcode->name); |
| for (s = opcode->args; *s != '\0'; ++s) |
| { |
| switch (*s) |
| { |
| case 'a': |
| print_general (insn8, info); |
| break; |
| |
| case 'b': |
| print_general (insn0, info); |
| break; |
| |
| case 'c': |
| print_general (insn16, info); |
| break; |
| |
| case 'i': |
| (*info->fprintf_func) (info->stream, "%d", insn0); |
| break; |
| |
| case 'x': |
| (*info->fprintf_func) (info->stream, "0x%x", (insn16 << 8) + insn0); |
| break; |
| |
| case 'h': |
| /* This used to be %x for binutils. */ |
| (*info->fprintf_func) (info->stream, "0x%x", |
| (insn16 << 24) + (insn0 << 16)); |
| break; |
| |
| case 'X': |
| (*info->fprintf_func) (info->stream, "%d", |
| ((insn16 << 8) + insn0) | 0xffff0000); |
| break; |
| |
| case 'P': |
| /* This output looks just like absolute addressing, but |
| maybe that's OK (it's what the GDB m68k and EBMON |
| a29k disassemblers do). */ |
| /* All the shifting is to sign-extend it. p*/ |
| (*info->print_address_func) |
| (memaddr + |
| (((int)((insn16 << 10) + (insn0 << 2)) << 14) >> 14), |
| info); |
| break; |
| |
| case 'A': |
| (*info->print_address_func) |
| ((insn16 << 10) + (insn0 << 2), info); |
| break; |
| |
| case 'e': |
| (*info->fprintf_func) (info->stream, "%d", insn16 >> 7); |
| break; |
| |
| case 'n': |
| (*info->fprintf_func) (info->stream, "0x%x", insn16 & 0x7f); |
| break; |
| |
| case 'v': |
| (*info->fprintf_func) (info->stream, "0x%x", insn16); |
| break; |
| |
| case 's': |
| print_special (insn8, info); |
| break; |
| |
| case 'u': |
| (*info->fprintf_func) (info->stream, "%d", insn0 >> 7); |
| break; |
| |
| case 'r': |
| (*info->fprintf_func) (info->stream, "%d", (insn0 >> 4) & 7); |
| break; |
| |
| case 'I': |
| if ((insn16 & 3) != 0) |
| (*info->fprintf_func) (info->stream, "%d", insn16 & 3); |
| break; |
| |
| case 'd': |
| (*info->fprintf_func) (info->stream, "%d", (insn0 >> 2) & 3); |
| break; |
| |
| case 'f': |
| (*info->fprintf_func) (info->stream, "%d", insn0 & 3); |
| break; |
| |
| case 'F': |
| (*info->fprintf_func) (info->stream, "%d", (insn16 >> 2) & 15); |
| break; |
| |
| case 'C': |
| (*info->fprintf_func) (info->stream, "%d", insn16 & 3); |
| break; |
| |
| default: |
| (*info->fprintf_func) (info->stream, "%c", *s); |
| } |
| } |
| |
| /* Now we look for a const,consth pair of instructions, |
| in which case we try to print the symbolic address. */ |
| if (insn24 == 2) /* consth */ |
| { |
| int errcode; |
| char prev_insn[4]; |
| unsigned char prev_insn0, prev_insn8, prev_insn16, prev_insn24; |
| |
| errcode = (*info->read_memory_func) (memaddr - 4, |
| (bfd_byte *) &prev_insn[0], |
| 4, |
| info); |
| if (errcode == 0) |
| { |
| /* If it is a delayed branch, we need to look at the |
| instruction before the delayed brach to handle |
| things like |
| |
| const _foo |
| call _printf |
| consth _foo |
| */ |
| (*find_byte_func) (prev_insn, &prev_insn0, &prev_insn8, |
| &prev_insn16, &prev_insn24); |
| if (is_delayed_branch (prev_insn24)) |
| { |
| errcode = (*info->read_memory_func) |
| (memaddr - 8, (bfd_byte *) &prev_insn[0], 4, info); |
| (*find_byte_func) (prev_insn, &prev_insn0, &prev_insn8, |
| &prev_insn16, &prev_insn24); |
| } |
| } |
| |
| /* If there was a problem reading memory, then assume |
| the previous instruction was not const. */ |
| if (errcode == 0) |
| { |
| /* Is it const to the same register? */ |
| if (prev_insn24 == 3 |
| && prev_insn8 == insn8) |
| { |
| (*info->fprintf_func) (info->stream, "\t; "); |
| (*info->print_address_func) |
| (((insn16 << 24) + (insn0 << 16) |
| + (prev_insn16 << 8) + (prev_insn0)), |
| info); |
| } |
| } |
| } |
| |
| return 4; |
| } |
| } |
| /* This used to be %8x for binutils. */ |
| (*info->fprintf_func) |
| (info->stream, ".word 0x%08x", |
| (insn24 << 24) + (insn16 << 16) + (insn8 << 8) + insn0); |
| return 4; |
| } |
| |
| /* Disassemble an big-endian a29k instruction. */ |
| int |
| print_insn_big_a29k (memaddr, info) |
| bfd_vma memaddr; |
| struct disassemble_info *info; |
| { |
| info->private_data = (PTR) find_bytes_big; |
| return print_insn (memaddr, info); |
| } |
| |
| /* Disassemble a little-endian a29k instruction. */ |
| int |
| print_insn_little_a29k (memaddr, info) |
| bfd_vma memaddr; |
| struct disassemble_info *info; |
| { |
| info->private_data = (PTR) find_bytes_little; |
| return print_insn (memaddr, info); |
| } |