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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [opcodes/] [tic4x-dis.c] - Rev 438
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/* Print instructions for the Texas TMS320C[34]X, for GDB and GNU Binutils. Copyright 2002, 2003, 2005, 2007 Free Software Foundation, Inc. Contributed by Michael P. Hayes (m.hayes@elec.canterbury.ac.nz) 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 <math.h> #include "libiberty.h" #include "dis-asm.h" #include "opcode/tic4x.h" #define TIC4X_DEBUG 0 #define TIC4X_HASH_SIZE 11 /* 11 (bits) and above should give unique entries. */ #define TIC4X_SPESOP_SIZE 8 /* Max 8. ops for special instructions. */ typedef enum { IMMED_SINT, IMMED_SUINT, IMMED_SFLOAT, IMMED_INT, IMMED_UINT, IMMED_FLOAT } immed_t; typedef enum { INDIRECT_SHORT, INDIRECT_LONG, INDIRECT_TIC4X } indirect_t; static int tic4x_version = 0; static int tic4x_dp = 0; static int tic4x_pc_offset (unsigned int op) { /* Determine the PC offset for a C[34]x instruction. This could be simplified using some boolean algebra but at the expense of readability. */ switch (op >> 24) { case 0x60: /* br */ case 0x62: /* call (C4x) */ case 0x64: /* rptb (C4x) */ return 1; case 0x61: /* brd */ case 0x63: /* laj */ case 0x65: /* rptbd (C4x) */ return 3; case 0x66: /* swi */ case 0x67: return 0; default: break; } switch ((op & 0xffe00000) >> 20) { case 0x6a0: /* bB */ case 0x720: /* callB */ case 0x740: /* trapB */ return 1; case 0x6a2: /* bBd */ case 0x6a6: /* bBat */ case 0x6aa: /* bBaf */ case 0x722: /* lajB */ case 0x748: /* latB */ case 0x798: /* rptbd */ return 3; default: break; } switch ((op & 0xfe200000) >> 20) { case 0x6e0: /* dbB */ return 1; case 0x6e2: /* dbBd */ return 3; default: break; } return 0; } static int tic4x_print_char (struct disassemble_info * info, char ch) { if (info != NULL) (*info->fprintf_func) (info->stream, "%c", ch); return 1; } static int tic4x_print_str (struct disassemble_info *info, char *str) { if (info != NULL) (*info->fprintf_func) (info->stream, "%s", str); return 1; } static int tic4x_print_register (struct disassemble_info *info, unsigned long regno) { static tic4x_register_t ** registertable = NULL; unsigned int i; if (registertable == NULL) { registertable = xmalloc (sizeof (tic4x_register_t *) * REG_TABLE_SIZE); for (i = 0; i < tic3x_num_registers; i++) registertable[tic3x_registers[i].regno] = (tic4x_register_t *) (tic3x_registers + i); if (IS_CPU_TIC4X (tic4x_version)) { /* Add C4x additional registers, overwriting any C3x registers if necessary. */ for (i = 0; i < tic4x_num_registers; i++) registertable[tic4x_registers[i].regno] = (tic4x_register_t *)(tic4x_registers + i); } } if ((int) regno > (IS_CPU_TIC4X (tic4x_version) ? TIC4X_REG_MAX : TIC3X_REG_MAX)) return 0; if (info != NULL) (*info->fprintf_func) (info->stream, "%s", registertable[regno]->name); return 1; } static int tic4x_print_addr (struct disassemble_info *info, unsigned long addr) { if (info != NULL) (*info->print_address_func)(addr, info); return 1; } static int tic4x_print_relative (struct disassemble_info *info, unsigned long pc, long offset, unsigned long opcode) { return tic4x_print_addr (info, pc + offset + tic4x_pc_offset (opcode)); } static int tic4x_print_direct (struct disassemble_info *info, unsigned long arg) { if (info != NULL) { (*info->fprintf_func) (info->stream, "@"); tic4x_print_addr (info, arg + (tic4x_dp << 16)); } return 1; } #if 0 /* FIXME: make the floating point stuff not rely on host floating point arithmetic. */ static void tic4x_print_ftoa (unsigned int val, FILE *stream, fprintf_ftype pfunc) { int e; int s; int f; double num = 0.0; e = EXTRS (val, 31, 24); /* Exponent. */ if (e != -128) { s = EXTRU (val, 23, 23); /* Sign bit. */ f = EXTRU (val, 22, 0); /* Mantissa. */ if (s) f += -2 * (1 << 23); else f += (1 << 23); num = f / (double)(1 << 23); num = ldexp (num, e); } (*pfunc)(stream, "%.9g", num); } #endif static int tic4x_print_immed (struct disassemble_info *info, immed_t type, unsigned long arg) { int s; int f; int e; double num = 0.0; if (info == NULL) return 1; switch (type) { case IMMED_SINT: case IMMED_INT: (*info->fprintf_func) (info->stream, "%ld", (long) arg); break; case IMMED_SUINT: case IMMED_UINT: (*info->fprintf_func) (info->stream, "%lu", arg); break; case IMMED_SFLOAT: e = EXTRS (arg, 15, 12); if (e != -8) { s = EXTRU (arg, 11, 11); f = EXTRU (arg, 10, 0); if (s) f += -2 * (1 << 11); else f += (1 << 11); num = f / (double)(1 << 11); num = ldexp (num, e); } (*info->fprintf_func) (info->stream, "%f", num); break; case IMMED_FLOAT: e = EXTRS (arg, 31, 24); if (e != -128) { s = EXTRU (arg, 23, 23); f = EXTRU (arg, 22, 0); if (s) f += -2 * (1 << 23); else f += (1 << 23); num = f / (double)(1 << 23); num = ldexp (num, e); } (*info->fprintf_func) (info->stream, "%f", num); break; } return 1; } static int tic4x_print_cond (struct disassemble_info *info, unsigned int cond) { static tic4x_cond_t **condtable = NULL; unsigned int i; if (condtable == NULL) { condtable = xmalloc (sizeof (tic4x_cond_t *) * 32); for (i = 0; i < tic4x_num_conds; i++) condtable[tic4x_conds[i].cond] = (tic4x_cond_t *)(tic4x_conds + i); } if (cond > 31 || condtable[cond] == NULL) return 0; if (info != NULL) (*info->fprintf_func) (info->stream, "%s", condtable[cond]->name); return 1; } static int tic4x_print_indirect (struct disassemble_info *info, indirect_t type, unsigned long arg) { unsigned int aregno; unsigned int modn; unsigned int disp; char *a; aregno = 0; modn = 0; disp = 1; switch(type) { case INDIRECT_TIC4X: /* *+ARn(disp) */ disp = EXTRU (arg, 7, 3); aregno = EXTRU (arg, 2, 0) + REG_AR0; modn = 0; break; case INDIRECT_SHORT: disp = 1; aregno = EXTRU (arg, 2, 0) + REG_AR0; modn = EXTRU (arg, 7, 3); break; case INDIRECT_LONG: disp = EXTRU (arg, 7, 0); aregno = EXTRU (arg, 10, 8) + REG_AR0; modn = EXTRU (arg, 15, 11); if (modn > 7 && disp != 0) return 0; break; default: (*info->fprintf_func)(info->stream, "# internal error: Unknown indirect type %d", type); return 0; } if (modn > TIC3X_MODN_MAX) return 0; a = tic4x_indirects[modn].name; while (*a) { switch (*a) { case 'a': tic4x_print_register (info, aregno); break; case 'd': tic4x_print_immed (info, IMMED_UINT, disp); break; case 'y': tic4x_print_str (info, "ir0"); break; case 'z': tic4x_print_str (info, "ir1"); break; default: tic4x_print_char (info, *a); break; } a++; } return 1; } static int tic4x_print_op (struct disassemble_info *info, unsigned long instruction, tic4x_inst_t *p, unsigned long pc) { int val; char *s; char *parallel = NULL; /* Print instruction name. */ s = p->name; while (*s && parallel == NULL) { switch (*s) { case 'B': if (! tic4x_print_cond (info, EXTRU (instruction, 20, 16))) return 0; break; case 'C': if (! tic4x_print_cond (info, EXTRU (instruction, 27, 23))) return 0; break; case '_': parallel = s + 1; /* Skip past `_' in name. */ break; default: tic4x_print_char (info, *s); break; } s++; } /* Print arguments. */ s = p->args; if (*s) tic4x_print_char (info, ' '); while (*s) { switch (*s) { case '*': /* Indirect 0--15. */ if (! tic4x_print_indirect (info, INDIRECT_LONG, EXTRU (instruction, 15, 0))) return 0; break; case '#': /* Only used for ldp, ldpk. */ tic4x_print_immed (info, IMMED_UINT, EXTRU (instruction, 15, 0)); break; case '@': /* Direct 0--15. */ tic4x_print_direct (info, EXTRU (instruction, 15, 0)); break; case 'A': /* Address register 24--22. */ if (! tic4x_print_register (info, EXTRU (instruction, 24, 22) + REG_AR0)) return 0; break; case 'B': /* 24-bit unsigned int immediate br(d)/call/rptb address 0--23. */ if (IS_CPU_TIC4X (tic4x_version)) tic4x_print_relative (info, pc, EXTRS (instruction, 23, 0), p->opcode); else tic4x_print_addr (info, EXTRU (instruction, 23, 0)); break; case 'C': /* Indirect (short C4x) 0--7. */ if (! IS_CPU_TIC4X (tic4x_version)) return 0; if (! tic4x_print_indirect (info, INDIRECT_TIC4X, EXTRU (instruction, 7, 0))) return 0; break; case 'D': /* Cockup if get here... */ break; case 'E': /* Register 0--7. */ case 'e': if (! tic4x_print_register (info, EXTRU (instruction, 7, 0))) return 0; break; case 'F': /* 16-bit float immediate 0--15. */ tic4x_print_immed (info, IMMED_SFLOAT, EXTRU (instruction, 15, 0)); break; case 'i': /* Extended indirect 0--7. */ if (EXTRU (instruction, 7, 5) == 7) { if (!tic4x_print_register (info, EXTRU (instruction, 4, 0))) return 0; break; } /* Fallthrough */ case 'I': /* Indirect (short) 0--7. */ if (! tic4x_print_indirect (info, INDIRECT_SHORT, EXTRU (instruction, 7, 0))) return 0; break; case 'j': /* Extended indirect 8--15 */ if (EXTRU (instruction, 15, 13) == 7) { if (! tic4x_print_register (info, EXTRU (instruction, 12, 8))) return 0; break; } case 'J': /* Indirect (short) 8--15. */ if (! tic4x_print_indirect (info, INDIRECT_SHORT, EXTRU (instruction, 15, 8))) return 0; break; case 'G': /* Register 8--15. */ case 'g': if (! tic4x_print_register (info, EXTRU (instruction, 15, 8))) return 0; break; case 'H': /* Register 16--18. */ if (! tic4x_print_register (info, EXTRU (instruction, 18, 16))) return 0; break; case 'K': /* Register 19--21. */ if (! tic4x_print_register (info, EXTRU (instruction, 21, 19))) return 0; break; case 'L': /* Register 22--24. */ if (! tic4x_print_register (info, EXTRU (instruction, 24, 22))) return 0; break; case 'M': /* Register 22--22. */ tic4x_print_register (info, EXTRU (instruction, 22, 22) + REG_R2); break; case 'N': /* Register 23--23. */ tic4x_print_register (info, EXTRU (instruction, 23, 23) + REG_R0); break; case 'O': /* Indirect (short C4x) 8--15. */ if (! IS_CPU_TIC4X (tic4x_version)) return 0; if (! tic4x_print_indirect (info, INDIRECT_TIC4X, EXTRU (instruction, 15, 8))) return 0; break; case 'P': /* Displacement 0--15 (used by Bcond and BcondD). */ tic4x_print_relative (info, pc, EXTRS (instruction, 15, 0), p->opcode); break; case 'Q': /* Register 0--15. */ case 'q': if (! tic4x_print_register (info, EXTRU (instruction, 15, 0))) return 0; break; case 'R': /* Register 16--20. */ case 'r': if (! tic4x_print_register (info, EXTRU (instruction, 20, 16))) return 0; break; case 'S': /* 16-bit signed immediate 0--15. */ tic4x_print_immed (info, IMMED_SINT, EXTRS (instruction, 15, 0)); break; case 'T': /* 5-bit signed immediate 16--20 (C4x stik). */ if (! IS_CPU_TIC4X (tic4x_version)) return 0; if (! tic4x_print_immed (info, IMMED_SUINT, EXTRU (instruction, 20, 16))) return 0; break; case 'U': /* 16-bit unsigned int immediate 0--15. */ tic4x_print_immed (info, IMMED_SUINT, EXTRU (instruction, 15, 0)); break; case 'V': /* 5/9-bit unsigned vector 0--4/8. */ tic4x_print_immed (info, IMMED_SUINT, IS_CPU_TIC4X (tic4x_version) ? EXTRU (instruction, 8, 0) : EXTRU (instruction, 4, 0) & ~0x20); break; case 'W': /* 8-bit signed immediate 0--7. */ if (! IS_CPU_TIC4X (tic4x_version)) return 0; tic4x_print_immed (info, IMMED_SINT, EXTRS (instruction, 7, 0)); break; case 'X': /* Expansion register 4--0. */ val = EXTRU (instruction, 4, 0) + REG_IVTP; if (val < REG_IVTP || val > REG_TVTP) return 0; if (! tic4x_print_register (info, val)) return 0; break; case 'Y': /* Address register 16--20. */ val = EXTRU (instruction, 20, 16); if (val < REG_AR0 || val > REG_SP) return 0; if (! tic4x_print_register (info, val)) return 0; break; case 'Z': /* Expansion register 16--20. */ val = EXTRU (instruction, 20, 16) + REG_IVTP; if (val < REG_IVTP || val > REG_TVTP) return 0; if (! tic4x_print_register (info, val)) return 0; break; case '|': /* Parallel instruction. */ tic4x_print_str (info, " || "); tic4x_print_str (info, parallel); tic4x_print_char (info, ' '); break; case ';': tic4x_print_char (info, ','); break; default: tic4x_print_char (info, *s); break; } s++; } return 1; } static void tic4x_hash_opcode_special (tic4x_inst_t **optable_special, const tic4x_inst_t *inst) { int i; for (i = 0;i < TIC4X_SPESOP_SIZE; i++) if (optable_special[i] != NULL && optable_special[i]->opcode == inst->opcode) { /* Collision (we have it already) - overwrite. */ optable_special[i] = (tic4x_inst_t *) inst; return; } for (i = 0; i < TIC4X_SPESOP_SIZE; i++) if (optable_special[i] == NULL) { /* Add the new opcode. */ optable_special[i] = (tic4x_inst_t *) inst; return; } /* This should never occur. This happens if the number of special instructions exceeds TIC4X_SPESOP_SIZE. Please increase the variable of this variable */ #if TIC4X_DEBUG printf ("optable_special[] is full, please increase TIC4X_SPESOP_SIZE!\n"); #endif } static void tic4x_hash_opcode (tic4x_inst_t **optable, tic4x_inst_t **optable_special, const tic4x_inst_t *inst, const unsigned long tic4x_oplevel) { int j; int opcode = inst->opcode >> (32 - TIC4X_HASH_SIZE); int opmask = inst->opmask >> (32 - TIC4X_HASH_SIZE); /* Use a TIC4X_HASH_SIZE bit index as a hash index. We should have unique entries so there's no point having a linked list for each entry? */ for (j = opcode; j < opmask; j++) if ((j & opmask) == opcode && inst->oplevel & tic4x_oplevel) { #if TIC4X_DEBUG /* We should only have collisions for synonyms like ldp for ldi. */ if (optable[j] != NULL) printf ("Collision at index %d, %s and %s\n", j, optable[j]->name, inst->name); #endif /* Catch those ops that collide with others already inside the hash, and have a opmask greater than the one we use in the hash. Store them in a special-list, that will handle full 32-bit INSN, not only the first 11-bit (or so). */ if (optable[j] != NULL && inst->opmask & ~(opmask << (32 - TIC4X_HASH_SIZE))) { /* Add the instruction already on the list. */ tic4x_hash_opcode_special (optable_special, optable[j]); /* Add the new instruction. */ tic4x_hash_opcode_special (optable_special, inst); } optable[j] = (tic4x_inst_t *) inst; } } /* Disassemble the instruction in 'instruction'. 'pc' should be the address of this instruction, it will be used to print the target address if this is a relative jump or call the disassembled instruction is written to 'info'. The function returns the length of this instruction in words. */ static int tic4x_disassemble (unsigned long pc, unsigned long instruction, struct disassemble_info *info) { static tic4x_inst_t **optable = NULL; static tic4x_inst_t **optable_special = NULL; tic4x_inst_t *p; int i; unsigned long tic4x_oplevel; tic4x_version = info->mach; tic4x_oplevel = (IS_CPU_TIC4X (tic4x_version)) ? OP_C4X : 0; tic4x_oplevel |= OP_C3X | OP_LPWR | OP_IDLE2 | OP_ENH; if (optable == NULL) { optable = xcalloc (sizeof (tic4x_inst_t *), (1 << TIC4X_HASH_SIZE)); optable_special = xcalloc (sizeof (tic4x_inst_t *), TIC4X_SPESOP_SIZE); /* Install opcodes in reverse order so that preferred forms overwrite synonyms. */ for (i = tic4x_num_insts - 1; i >= 0; i--) tic4x_hash_opcode (optable, optable_special, &tic4x_insts[i], tic4x_oplevel); /* We now need to remove the insn that are special from the "normal" optable, to make the disasm search this extra list for them. */ for (i = 0; i < TIC4X_SPESOP_SIZE; i++) if (optable_special[i] != NULL) optable[optable_special[i]->opcode >> (32 - TIC4X_HASH_SIZE)] = NULL; } /* See if we can pick up any loading of the DP register... */ if ((instruction >> 16) == 0x5070 || (instruction >> 16) == 0x1f70) tic4x_dp = EXTRU (instruction, 15, 0); p = optable[instruction >> (32 - TIC4X_HASH_SIZE)]; if (p != NULL) { if (((instruction & p->opmask) == p->opcode) && tic4x_print_op (NULL, instruction, p, pc)) tic4x_print_op (info, instruction, p, pc); else (*info->fprintf_func) (info->stream, "%08lx", instruction); } else { for (i = 0; i<TIC4X_SPESOP_SIZE; i++) if (optable_special[i] != NULL && optable_special[i]->opcode == instruction) { (*info->fprintf_func)(info->stream, "%s", optable_special[i]->name); break; } if (i == TIC4X_SPESOP_SIZE) (*info->fprintf_func) (info->stream, "%08lx", instruction); } /* Return size of insn in words. */ return 1; } /* The entry point from objdump and gdb. */ int print_insn_tic4x (bfd_vma memaddr, struct disassemble_info *info) { int status; unsigned long pc; unsigned long op; bfd_byte buffer[4]; status = (*info->read_memory_func) (memaddr, buffer, 4, info); if (status != 0) { (*info->memory_error_func) (status, memaddr, info); return -1; } pc = memaddr; op = bfd_getl32 (buffer); info->bytes_per_line = 4; info->bytes_per_chunk = 4; info->octets_per_byte = 4; info->display_endian = BFD_ENDIAN_LITTLE; return tic4x_disassemble (pc, op, info) * 4; }
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