/* Instruction printing code for the AMD 29000 Copyright (C) 1990 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 1, 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; see the file COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #ifdef GDB # include "defs.h" # include "target.h" # include "am29k-opcode.h" #else # include "bfd.h" # include "sysdep.h" # include "a29k-opcode.h" # define am29k_opcodes a29k_opcodes # define am29k_opcode a29k_opcode # define NUM_OPCODES num_opcodes # define fprintf_filtered fprintf #endif /* 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, stream) int num; FILE *stream; { if (num < 128) fprintf_filtered (stream, "gr%d", num); else fprintf_filtered (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, stream) int num; FILE *stream; { /* 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" }; #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) fprintf_filtered (stream, spec0_names[num]); else if (num >= 128 && num < 128 + SPEC128_NUM) fprintf_filtered (stream, spec128_names[num-128]); else if (num >= 160 && num < 160 + SPEC160_NUM) fprintf_filtered (stream, spec160_names[num-160]); else fprintf_filtered (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}. Note that the amd can be set up as either big or little-endian (the tm file says which) and we can't assume the host machine is the same. */ static void find_bytes (insn, insn0, insn8, insn16, insn24) char *insn; unsigned char *insn0; unsigned char *insn8; unsigned char *insn16; unsigned char *insn24; { #if TARGET_BYTE_ORDER == BIG_ENDIAN *insn24 = insn[0]; *insn16 = insn[1]; *insn8 = insn[2]; *insn0 = insn[3]; #else /* Little-endian. */ *insn24 = insn[3]; *insn16 = insn[2]; *insn8 = insn[1]; *insn0 = insn[0]; #endif /* Little-endian. */ } /* Print one instruction from MEMADDR on STREAM. Return the size of the instruction (always 4 on am29k). */ #ifdef GDB print_insn (memaddr, stream) CORE_ADDR memaddr; FILE *stream; #else int print_insn_a29k (memaddr, buffer, stream) bfd_vma memaddr; uint8e_type *buffer; FILE *stream; #endif { /* The raw instruction. */ char insn[4]; /* The four bytes of the instruction. */ unsigned char insn24, insn16, insn8, insn0; unsigned long value; CONST struct am29k_opcode *opcode; #ifdef GDB read_memory (memaddr, &insn[0], 4); #else insn[0] = ((char*)buffer)[0]; insn[1] = ((char*)buffer)[1]; insn[2] = ((char*)buffer)[2]; insn[3] = ((char*)buffer)[3]; #endif find_bytes (insn, &insn0, &insn8, &insn16, &insn24); value = (insn24 << 24) + (insn16 << 16) + (insn8 << 8) + insn0; /* Handle the nop (aseq 0x40,gr1,gr1) specially */ if ((insn24==0x70) && (insn16==0x40) && (insn8==0x01) && (insn0==0x01)) { fprintf_filtered (stream,"nop"); return 4; } /* The opcode is always in insn24. */ for (opcode = &am29k_opcodes[0]; opcode < &am29k_opcodes[NUM_OPCODES]; ++opcode) { #ifdef GDB if (insn24 == opcode->opcode) #else if (insn24 == (opcode->opcode >> 24)) #endif { char *s; fprintf_filtered (stream, "%s ", opcode->name); for (s = opcode->args; *s != '\0'; ++s) { switch (*s) { case 'a': print_general (insn8, stream); break; case 'b': print_general (insn0, stream); break; case 'c': print_general (insn16, stream); break; case 'i': fprintf_filtered (stream, "%d", insn0); break; case 'x': fprintf_filtered (stream, "%d", (insn16 << 8) + insn0); break; case 'h': fprintf_filtered (stream, "0x%x", (insn16 << 24) + (insn0 << 16)); break; case 'X': fprintf_filtered (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 68k and EBMON 29k disassemblers do). */ /* All the shifting is to sign-extend it. p*/ print_address (memaddr + (((int)((insn16 << 10) + (insn0 << 2)) << 14) >> 14), stream); break; case 'A': print_address ((insn16 << 10) + (insn0 << 2), stream); break; case 'e': fprintf_filtered (stream, "%d", insn16 >> 7); break; case 'n': fprintf_filtered (stream, "0x%x", insn16 & 0x7f); break; case 'v': fprintf_filtered (stream, "%x", insn16); break; case 's': print_special (insn8, stream); break; case 'u': fprintf_filtered (stream, "%d", insn0 >> 7); break; case 'r': fprintf_filtered (stream, "%d", (insn0 >> 4) & 7); break; case 'd': fprintf_filtered (stream, "%d", (insn0 >> 2) & 3); break; case 'f': fprintf_filtered (stream, "%d", insn0 & 3); break; case 'F': fprintf_filtered (stream, "%d", (value >> 18) & 0xf); break; case 'C': fprintf_filtered (stream, "%d", (value >> 16) & 3); break; default: fprintf_filtered (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; #ifdef GDB errcode = target_read_memory (memaddr - 4, &prev_insn[0], 4); #else prev_insn[0] = ((char*)buffer)[0-4]; prev_insn[1] = ((char*)buffer)[1-4]; prev_insn[2] = ((char*)buffer)[2-4]; prev_insn[3] = ((char*)buffer)[3-4]; errcode = 0; #endif 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_bytes (prev_insn, &prev_insn0, &prev_insn8, &prev_insn16, &prev_insn24); if (is_delayed_branch (prev_insn24)) { #ifdef GDB errcode = target_read_memory (memaddr - 8, &prev_insn[0], 4); #else prev_insn[0] = ((char*)buffer)[0-8]; prev_insn[1] = ((char*)buffer)[1-8]; prev_insn[2] = ((char*)buffer)[2-8]; prev_insn[3] = ((char*)buffer)[3-8]; errcode = 0; #endif find_bytes (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) { fprintf_filtered (stream, "\t; "); print_address (((insn16 << 24) + (insn0 << 16) + (prev_insn16 << 8) + (prev_insn0)), stream); } } } return 4; } } fprintf_filtered (stream, ".word %8x", (insn24 << 24) + (insn16 << 16) + (insn8 << 8) + insn0); return 4; }