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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [opcodes/] [or32-dis.c] - Rev 280
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/* Instruction printing code for the OpenRISC 1000 Copyright (C) 2002, 2005, 2007 Free Software Foundation, Inc. Contributed by Damjan Lampret <lampret@opencores.org>. Modified from a29k port. 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. */ #define DEBUG 0 #include "dis-asm.h" #include "opcode/or32.h" #include "safe-ctype.h" #include <string.h> #include <stdlib.h> #define EXTEND29(x) ((x) & (unsigned long) 0x10000000 ? ((x) | (unsigned long) 0xf0000000) : ((x))) /* Now find the four bytes of INSN_CH and put them in *INSN. */ static void find_bytes_big (unsigned char *insn_ch, unsigned long *insn) { *insn = ((unsigned long) insn_ch[0] << 24) + ((unsigned long) insn_ch[1] << 16) + ((unsigned long) insn_ch[2] << 8) + ((unsigned long) insn_ch[3]); #if DEBUG printf ("find_bytes_big3: %x\n", *insn); #endif } static void find_bytes_little (unsigned char *insn_ch, unsigned long *insn) { *insn = ((unsigned long) insn_ch[3] << 24) + ((unsigned long) insn_ch[2] << 16) + ((unsigned long) insn_ch[1] << 8) + ((unsigned long) insn_ch[0]); } typedef void (*find_byte_func_type) (unsigned char *, unsigned long *); static unsigned long or32_extract (char param_ch, char *enc_initial, unsigned long insn) { char *enc; unsigned long ret = 0; int opc_pos = 0; int param_pos = 0; for (enc = enc_initial; *enc != '\0'; enc++) if (*enc == param_ch) { if (enc - 2 >= enc_initial && (*(enc - 2) == '0') && (*(enc - 1) == 'x')) continue; else param_pos++; } #if DEBUG printf ("or32_extract: %c %x ", param_ch, param_pos); #endif opc_pos = 32; for (enc = enc_initial; *enc != '\0'; ) if ((*enc == '0') && (*(enc + 1) == 'x')) { opc_pos -= 4; if ((param_ch == '0') || (param_ch == '1')) { unsigned long tmp = strtoul (enc, NULL, 16); #if DEBUG printf (" enc=%s, tmp=%x ", enc, tmp); #endif if (param_ch == '0') tmp = 15 - tmp; ret |= tmp << opc_pos; } enc += 3; } else if ((*enc == '0') || (*enc == '1')) { opc_pos--; if (param_ch == *enc) ret |= 1 << opc_pos; enc++; } else if (*enc == param_ch) { opc_pos--; param_pos--; #if DEBUG printf ("\n ret=%x opc_pos=%x, param_pos=%x\n", ret, opc_pos, param_pos); #endif ret += ((insn >> opc_pos) & 0x1) << param_pos; if (!param_pos && letter_signed (param_ch) && ret >> (letter_range (param_ch) - 1)) { #if DEBUG printf ("\n ret=%x opc_pos=%x, param_pos=%x\n", ret, opc_pos, param_pos); #endif ret |= 0xffffffff << letter_range(param_ch); #if DEBUG printf ("\n after conversion to signed: ret=%x\n", ret); #endif } enc++; } else if (ISALPHA (*enc)) { opc_pos--; enc++; } else if (*enc == '-') { opc_pos--; enc++; } else enc++; #if DEBUG printf ("ret=%x\n", ret); #endif return ret; } static int or32_opcode_match (unsigned long insn, char *encoding) { unsigned long ones, zeros; #if DEBUG printf ("or32_opcode_match: %.8lx\n", insn); #endif ones = or32_extract ('1', encoding, insn); zeros = or32_extract ('0', encoding, insn); #if DEBUG printf ("ones: %x \n", ones); printf ("zeros: %x \n", zeros); #endif if ((insn & ones) != ones) { #if DEBUG printf ("ret1\n"); #endif return 0; } if ((~insn & zeros) != zeros) { #if DEBUG printf ("ret2\n"); #endif return 0; } #if DEBUG printf ("ret3\n"); #endif return 1; } /* Print register to INFO->STREAM. Used only by print_insn. */ static void or32_print_register (char param_ch, char *encoding, unsigned long insn, struct disassemble_info *info) { int regnum = or32_extract (param_ch, encoding, insn); #if DEBUG printf ("or32_print_register: %c, %s, %x\n", param_ch, encoding, insn); #endif if (param_ch == 'A') (*info->fprintf_func) (info->stream, "r%d", regnum); else if (param_ch == 'B') (*info->fprintf_func) (info->stream, "r%d", regnum); else if (param_ch == 'D') (*info->fprintf_func) (info->stream, "r%d", regnum); else if (regnum < 16) (*info->fprintf_func) (info->stream, "r%d", regnum); else if (regnum < 32) (*info->fprintf_func) (info->stream, "r%d", regnum-16); else (*info->fprintf_func) (info->stream, "X%d", regnum); } /* Print immediate to INFO->STREAM. Used only by print_insn. */ static void or32_print_immediate (char param_ch, char *encoding, unsigned long insn, struct disassemble_info *info) { int imm = or32_extract(param_ch, encoding, insn); if (letter_signed(param_ch)) (*info->fprintf_func) (info->stream, "0x%x", imm); /* (*info->fprintf_func) (info->stream, "%d", imm); */ else (*info->fprintf_func) (info->stream, "0x%x", imm); } /* Print one instruction from MEMADDR on INFO->STREAM. Return the size of the instruction (always 4 on or32). */ static int print_insn (bfd_vma memaddr, struct disassemble_info *info) { /* The raw instruction. */ unsigned char insn_ch[4]; /* Address. Will be sign extened 27-bit. */ unsigned long addr; /* The four bytes of the instruction. */ unsigned long insn; find_byte_func_type find_byte_func = (find_byte_func_type) info->private_data; struct or32_opcode const * opcode; { int status = (*info->read_memory_func) (memaddr, (bfd_byte *) &insn_ch[0], 4, info); if (status != 0) { (*info->memory_error_func) (status, memaddr, info); return -1; } } (*find_byte_func) (&insn_ch[0], &insn); for (opcode = &or32_opcodes[0]; opcode < &or32_opcodes[or32_num_opcodes]; ++opcode) { if (or32_opcode_match (insn, opcode->encoding)) { char *s; (*info->fprintf_func) (info->stream, "%s ", opcode->name); for (s = opcode->args; *s != '\0'; ++s) { switch (*s) { case '\0': return 4; case 'r': or32_print_register (*++s, opcode->encoding, insn, info); break; case 'X': addr = or32_extract ('X', opcode->encoding, insn) << 2; /* Calulate the correct address. XXX is this really correct ?? */ addr = memaddr + EXTEND29 (addr); (*info->print_address_func) (addr, info); break; default: if (strchr (opcode->encoding, *s)) or32_print_immediate (*s, opcode->encoding, insn, info); else (*info->fprintf_func) (info->stream, "%c", *s); } } return 4; } } /* This used to be %8x for binutils. */ (*info->fprintf_func) (info->stream, ".word 0x%08lx", insn); return 4; } /* Disassemble a big-endian or32 instruction. */ int print_insn_big_or32 (bfd_vma memaddr, struct disassemble_info *info) { info->private_data = find_bytes_big; return print_insn (memaddr, info); } /* Disassemble a little-endian or32 instruction. */ int print_insn_little_or32 (bfd_vma memaddr, struct disassemble_info *info) { info->private_data = find_bytes_little; return print_insn (memaddr, info); }
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