diff options
Diffstat (limited to 'opcodes/tic4x-dis.c')
| -rw-r--r-- | opcodes/tic4x-dis.c | 677 |
1 files changed, 677 insertions, 0 deletions
diff --git a/opcodes/tic4x-dis.c b/opcodes/tic4x-dis.c new file mode 100644 index 0000000..eff4ebb --- /dev/null +++ b/opcodes/tic4x-dis.c @@ -0,0 +1,677 @@ +/* Print instructions for the Texas TMS320C[34]X, for GDB and GNU Binutils. + + Copyright 2002 Free Software Foundation, Inc. + + Contributed by Michael P. Hayes (m.hayes@elec.canterbury.ac.nz) + + 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 <math.h> +#include "libiberty.h" +#include "dis-asm.h" +#include "opcode/tic4x.h" + +#define C4X_DEBUG 0 + +#define C4X_HASH_SIZE 11 /* 11 and above should give unique entries. */ + +typedef enum + { + IMMED_SINT, + IMMED_SUINT, + IMMED_SFLOAT, + IMMED_INT, + IMMED_UINT, + IMMED_FLOAT + } +immed_t; + +typedef enum + { + INDIRECT_SHORT, + INDIRECT_LONG, + INDIRECT_C4X + } +indirect_t; + +static int c4x_version = 0; +static int c4x_dp = 0; + +static int +c4x_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 +c4x_print_char (struct disassemble_info * info, char ch) +{ + if (info != NULL) + (*info->fprintf_func) (info->stream, "%c", ch); + return 1; +} + +static int +c4x_print_str (struct disassemble_info *info, char *str) +{ + if (info != NULL) + (*info->fprintf_func) (info->stream, "%s", str); + return 1; +} + +static int +c4x_print_register (struct disassemble_info *info, + unsigned long regno) +{ + static c4x_register_t **registertable = NULL; + unsigned int i; + + if (registertable == NULL) + { + registertable = (c4x_register_t **) + xmalloc (sizeof (c4x_register_t *) * REG_TABLE_SIZE); + for (i = 0; i < c3x_num_registers; i++) + registertable[c3x_registers[i].regno] = (void *)&c3x_registers[i]; + if (IS_CPU_C4X (c4x_version)) + { + /* Add C4x additional registers, overwriting + any C3x registers if necessary. */ + for (i = 0; i < c4x_num_registers; i++) + registertable[c4x_registers[i].regno] = (void *)&c4x_registers[i]; + } + } + if ((int) regno > (IS_CPU_C4X (c4x_version) ? C4X_REG_MAX : C3X_REG_MAX)) + return 0; + if (info != NULL) + (*info->fprintf_func) (info->stream, "%s", registertable[regno]->name); + return 1; +} + +static int +c4x_print_addr (struct disassemble_info *info, + unsigned long addr) +{ + if (info != NULL) + (*info->print_address_func)(addr, info); + return 1; +} + +static int +c4x_print_relative (struct disassemble_info *info, + unsigned long pc, + long offset, + unsigned long opcode) +{ + return c4x_print_addr (info, pc + offset + c4x_pc_offset (opcode)); +} + +static int +c4x_print_direct (struct disassemble_info *info, + unsigned long arg) +{ + if (info != NULL) + { + (*info->fprintf_func) (info->stream, "@"); + c4x_print_addr (info, arg + (c4x_dp << 16)); + } + return 1; +} + +/* FIXME: make the floating point stuff not rely on host + floating point arithmetic. */ +void +c4x_print_ftoa (unsigned int val, + FILE *stream, + int (*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); +} + +static int +c4x_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, "%d", (long)arg); + break; + + case IMMED_SUINT: + case IMMED_UINT: + (*info->fprintf_func) (info->stream, "%u", 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 +c4x_print_cond (struct disassemble_info *info, + unsigned int cond) +{ + static c4x_cond_t **condtable = NULL; + unsigned int i; + + if (condtable == NULL) + { + condtable = (c4x_cond_t **)xmalloc (sizeof (c4x_cond_t *) * 32); + for (i = 0; i < num_conds; i++) + condtable[c4x_conds[i].cond] = (void *)&c4x_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 +c4x_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_C4X: /* *+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: + abort (); + } + if (modn > C3X_MODN_MAX) + return 0; + a = c4x_indirects[modn].name; + while (*a) + { + switch (*a) + { + case 'a': + c4x_print_register (info, aregno); + break; + case 'd': + c4x_print_immed (info, IMMED_UINT, disp); + break; + case 'y': + c4x_print_str (info, "ir0"); + break; + case 'z': + c4x_print_str (info, "ir1"); + break; + default: + c4x_print_char (info, *a); + break; + } + a++; + } + return 1; +} + +static int +c4x_print_op (struct disassemble_info *info, + unsigned long instruction, + c4x_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 (! c4x_print_cond (info, EXTRU (instruction, 20, 16))) + return 0; + break; + case 'C': + if (! c4x_print_cond (info, EXTRU (instruction, 27, 23))) + return 0; + break; + case '_': + parallel = s + 1; /* Skip past `_' in name */ + break; + default: + c4x_print_char (info, *s); + break; + } + s++; + } + + /* Print arguments. */ + s = p->args; + if (*s) + c4x_print_char (info, ' '); + + while (*s) + { + switch (*s) + { + case '*': /* indirect 0--15 */ + if (! c4x_print_indirect (info, INDIRECT_LONG, + EXTRU (instruction, 15, 0))) + return 0; + break; + + case '#': /* only used for ldp, ldpk */ + c4x_print_immed (info, IMMED_UINT, EXTRU (instruction, 15, 0)); + break; + + case '@': /* direct 0--15 */ + c4x_print_direct (info, EXTRU (instruction, 15, 0)); + break; + + case 'A': /* address register 24--22 */ + if (! c4x_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_C4X (c4x_version)) + c4x_print_relative (info, pc, EXTRS (instruction, 23, 0), + p->opcode); + else + c4x_print_addr (info, EXTRU (instruction, 23, 0)); + break; + + case 'C': /* indirect (short C4x) 0--7 */ + if (! IS_CPU_C4X (c4x_version)) + return 0; + if (! c4x_print_indirect (info, INDIRECT_C4X, + EXTRU (instruction, 7, 0))) + return 0; + break; + + case 'D': + /* Cockup if get here... */ + break; + + case 'E': /* register 0--7 */ + if (! c4x_print_register (info, EXTRU (instruction, 7, 0))) + return 0; + break; + + case 'F': /* 16-bit float immediate 0--15 */ + c4x_print_immed (info, IMMED_SFLOAT, + EXTRU (instruction, 15, 0)); + break; + + case 'I': /* indirect (short) 0--7 */ + if (! c4x_print_indirect (info, INDIRECT_SHORT, + EXTRU (instruction, 7, 0))) + return 0; + break; + + case 'J': /* indirect (short) 8--15 */ + if (! c4x_print_indirect (info, INDIRECT_SHORT, + EXTRU (instruction, 15, 8))) + return 0; + break; + + case 'G': /* register 8--15 */ + if (! c4x_print_register (info, EXTRU (instruction, 15, 8))) + return 0; + break; + + case 'H': /* register 16--18 */ + if (! c4x_print_register (info, EXTRU (instruction, 18, 16))) + return 0; + break; + + case 'K': /* register 19--21 */ + if (! c4x_print_register (info, EXTRU (instruction, 21, 19))) + return 0; + break; + + case 'L': /* register 22--24 */ + if (! c4x_print_register (info, EXTRU (instruction, 24, 22))) + return 0; + break; + + case 'M': /* register 22--22 */ + c4x_print_register (info, EXTRU (instruction, 22, 22) + REG_R2); + break; + + case 'N': /* register 23--23 */ + c4x_print_register (info, EXTRU (instruction, 22, 22) + REG_R0); + break; + + case 'O': /* indirect (short C4x) 8--15 */ + if (! IS_CPU_C4X (c4x_version)) + return 0; + if (! c4x_print_indirect (info, INDIRECT_C4X, + EXTRU (instruction, 15, 8))) + return 0; + break; + + case 'P': /* displacement 0--15 (used by Bcond and BcondD) */ + c4x_print_relative (info, pc, EXTRS (instruction, 15, 0), + p->opcode); + break; + + case 'Q': /* register 0--15 */ + if (! c4x_print_register (info, EXTRU (instruction, 15, 0))) + return 0; + break; + + case 'R': /* register 16--20 */ + if (! c4x_print_register (info, EXTRU (instruction, 20, 16))) + return 0; + break; + + case 'S': /* 16-bit signed immediate 0--15 */ + c4x_print_immed (info, IMMED_SINT, + EXTRS (instruction, 15, 0)); + break; + + case 'T': /* 5-bit signed immediate 16--20 (C4x stik) */ + if (! IS_CPU_C4X (c4x_version)) + return 0; + if (! c4x_print_immed (info, IMMED_SUINT, + EXTRU (instruction, 20, 16))) + return 0; + break; + + case 'U': /* 16-bit unsigned int immediate 0--15 */ + c4x_print_immed (info, IMMED_SUINT, EXTRU (instruction, 15, 0)); + break; + + case 'V': /* 5/9-bit unsigned vector 0--4/8 */ + c4x_print_immed (info, IMMED_SUINT, + IS_CPU_C4X (c4x_version) ? + EXTRU (instruction, 8, 0) : + EXTRU (instruction, 4, 0) & ~0x20); + break; + + case 'W': /* 8-bit signed immediate 0--7 */ + if (! IS_CPU_C4X (c4x_version)) + return 0; + c4x_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 (! c4x_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 (! c4x_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 (! c4x_print_register (info, val)) + return 0; + break; + + case '|': /* Parallel instruction */ + c4x_print_str (info, " || "); + c4x_print_str (info, parallel); + c4x_print_char (info, ' '); + break; + + case ';': + c4x_print_char (info, ','); + break; + + default: + c4x_print_char (info, *s); + break; + } + s++; + } + return 1; +} + +static void +c4x_hash_opcode (c4x_inst_t **optable, + const c4x_inst_t *inst) +{ + int j; + int opcode = inst->opcode >> (32 - C4X_HASH_SIZE); + int opmask = inst->opmask >> (32 - C4X_HASH_SIZE); + + /* Use a C4X_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) + { +#if C4X_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 + optable[j] = (void *)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 +c4x_disassemble (unsigned long pc, + unsigned long instruction, + struct disassemble_info *info) +{ + static c4x_inst_t **optable = NULL; + c4x_inst_t *p; + int i; + + c4x_version = info->mach; + + if (optable == NULL) + { + optable = (c4x_inst_t **) + xcalloc (sizeof (c4x_inst_t *), (1 << C4X_HASH_SIZE)); + /* Install opcodes in reverse order so that preferred + forms overwrite synonyms. */ + for (i = c3x_num_insts - 1; i >= 0; i--) + c4x_hash_opcode (optable, &c3x_insts[i]); + if (IS_CPU_C4X (c4x_version)) + { + for (i = c4x_num_insts - 1; i >= 0; i--) + c4x_hash_opcode (optable, &c4x_insts[i]); + } + } + + /* See if we can pick up any loading of the DP register... */ + if ((instruction >> 16) == 0x5070 || (instruction >> 16) == 0x1f70) + c4x_dp = EXTRU (instruction, 15, 0); + + p = optable[instruction >> (32 - C4X_HASH_SIZE)]; + if (p != NULL && ((instruction & p->opmask) == p->opcode) + && c4x_print_op (NULL, instruction, p, pc)) + c4x_print_op (info, instruction, p, pc); + else + (*info->fprintf_func) (info->stream, "%08x", instruction); + + /* Return size of insn in words. */ + return 1; +} + +/* The entry point from objdump and gdb. */ +int +print_insn_tic4x (memaddr, info) + 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 c4x_disassemble (pc, op, info) * 4; +} |