diff options
Diffstat (limited to 'x/binutils/opcodes/arm-dis.c')
| -rw-r--r-- | x/binutils/opcodes/arm-dis.c | 1388 |
1 files changed, 1388 insertions, 0 deletions
diff --git a/x/binutils/opcodes/arm-dis.c b/x/binutils/opcodes/arm-dis.c new file mode 100644 index 0000000..e918daf --- /dev/null +++ b/x/binutils/opcodes/arm-dis.c @@ -0,0 +1,1388 @@ +/* Instruction printing code for the ARM + Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 + Free Software Foundation, Inc. + Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org) + Modification by James G. Smith (jsmith@cygnus.co.uk) + + This file is part of libopcodes. + + 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" +#define DEFINE_TABLE +#include "arm-opc.h" +#include "coff/internal.h" +#include "libcoff.h" +#include "opintl.h" +#include "safe-ctype.h" + +/* FIXME: This shouldn't be done here. */ +#include "elf-bfd.h" +#include "elf/internal.h" +#include "elf/arm.h" + +#ifndef streq +#define streq(a,b) (strcmp ((a), (b)) == 0) +#endif + +#ifndef strneq +#define strneq(a,b,n) (strncmp ((a), (b), (n)) == 0) +#endif + +#ifndef NUM_ELEM +#define NUM_ELEM(a) (sizeof (a) / sizeof (a)[0]) +#endif + +static char * arm_conditional[] = +{"eq", "ne", "cs", "cc", "mi", "pl", "vs", "vc", + "hi", "ls", "ge", "lt", "gt", "le", "", "nv"}; + +typedef struct +{ + const char * name; + const char * description; + const char * reg_names[16]; +} +arm_regname; + +static arm_regname regnames[] = +{ + { "raw" , "Select raw register names", + { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"}}, + { "gcc", "Select register names used by GCC", + { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "sl", "fp", "ip", "sp", "lr", "pc" }}, + { "std", "Select register names used in ARM's ISA documentation", + { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "sp", "lr", "pc" }}, + { "apcs", "Select register names used in the APCS", + { "a1", "a2", "a3", "a4", "v1", "v2", "v3", "v4", "v5", "v6", "sl", "fp", "ip", "sp", "lr", "pc" }}, + { "atpcs", "Select register names used in the ATPCS", + { "a1", "a2", "a3", "a4", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v8", "IP", "SP", "LR", "PC" }}, + { "special-atpcs", "Select special register names used in the ATPCS", + { "a1", "a2", "a3", "a4", "v1", "v2", "v3", "WR", "v5", "SB", "SL", "FP", "IP", "SP", "LR", "PC" }}, + { "iwmmxt_regnames", "Select register names used on the Intel Wireless MMX technology coprocessor", + { "wr0", "wr1", "wr2", "wr3", "wr4", "wr5", "wr6", "wr7", "wr8", "wr9", "wr10", "wr11", "wr12", "wr13", "wr14", "wr15"}}, + { "iwmmxt_Cregnames", "Select control register names used on the Intel Wireless MMX technology coprocessor", + {"wcid", "wcon", "wcssf", "wcasf", "reserved", "reserved", "reserved", "reserved", "wcgr0", "wcgr1", "wcgr2", "wcgr3", "reserved", "reserved", "reserved", "reserved"}} +}; + +static char * iwmmxt_wwnames[] = +{"b", "h", "w", "d"}; + +static char * iwmmxt_wwssnames[] = +{"b", "bus", "b", "bss", + "h", "hus", "h", "hss", + "w", "wus", "w", "wss", + "d", "dus", "d", "dss" +}; + +/* Default to GCC register name set. */ +static unsigned int regname_selected = 1; + +#define NUM_ARM_REGNAMES NUM_ELEM (regnames) +#define arm_regnames regnames[regname_selected].reg_names + +static bfd_boolean force_thumb = FALSE; + +static char * arm_fp_const[] = +{"0.0", "1.0", "2.0", "3.0", "4.0", "5.0", "0.5", "10.0"}; + +static char * arm_shift[] = +{"lsl", "lsr", "asr", "ror"}; + +/* Forward declarations. */ +static void arm_decode_shift + PARAMS ((long, fprintf_ftype, void *)); +static int print_insn_arm + PARAMS ((bfd_vma, struct disassemble_info *, long)); +static int print_insn_thumb + PARAMS ((bfd_vma, struct disassemble_info *, long)); +static void parse_disassembler_options + PARAMS ((char *)); +static int print_insn + PARAMS ((bfd_vma, struct disassemble_info *, bfd_boolean)); +static int set_iwmmxt_regnames + PARAMS ((void)); + +int get_arm_regname_num_options + PARAMS ((void)); +int set_arm_regname_option + PARAMS ((int)); +int get_arm_regnames + PARAMS ((int, const char **, const char **, const char ***)); + +/* Functions. */ +int +get_arm_regname_num_options () +{ + return NUM_ARM_REGNAMES; +} + +int +set_arm_regname_option (option) + int option; +{ + int old = regname_selected; + regname_selected = option; + return old; +} + +int +get_arm_regnames (option, setname, setdescription, register_names) + int option; + const char **setname; + const char **setdescription; + const char ***register_names; +{ + *setname = regnames[option].name; + *setdescription = regnames[option].description; + *register_names = regnames[option].reg_names; + return 16; +} + +static void +arm_decode_shift (given, func, stream) + long given; + fprintf_ftype func; + void * stream; +{ + func (stream, "%s", arm_regnames[given & 0xf]); + + if ((given & 0xff0) != 0) + { + if ((given & 0x10) == 0) + { + int amount = (given & 0xf80) >> 7; + int shift = (given & 0x60) >> 5; + + if (amount == 0) + { + if (shift == 3) + { + func (stream, ", rrx"); + return; + } + + amount = 32; + } + + func (stream, ", %s #%d", arm_shift[shift], amount); + } + else + func (stream, ", %s %s", arm_shift[(given & 0x60) >> 5], + arm_regnames[(given & 0xf00) >> 8]); + } +} + +static int +set_iwmmxt_regnames () +{ + const char * setname; + const char * setdesc; + const char ** regnames; + int iwmmxt_regnames = 0; + int num_regnames = get_arm_regname_num_options (); + + get_arm_regnames (iwmmxt_regnames, &setname, + &setdesc, ®names); + while ((strcmp ("iwmmxt_regnames", setname)) + && (iwmmxt_regnames < num_regnames)) + get_arm_regnames (++iwmmxt_regnames, &setname, &setdesc, ®names); + + return iwmmxt_regnames; +} + +/* Print one instruction from PC on INFO->STREAM. + Return the size of the instruction (always 4 on ARM). */ + +static int +print_insn_arm (pc, info, given) + bfd_vma pc; + struct disassemble_info *info; + long given; +{ + const struct arm_opcode *insn; + void *stream = info->stream; + fprintf_ftype func = info->fprintf_func; + static int iwmmxt_regnames = 0; + + for (insn = arm_opcodes; insn->assembler; insn++) + { + if (insn->value == FIRST_IWMMXT_INSN + && info->mach != bfd_mach_arm_XScale + && info->mach != bfd_mach_arm_iWMMXt) + insn = insn + IWMMXT_INSN_COUNT; + + if ((given & insn->mask) == insn->value) + { + char * c; + + for (c = insn->assembler; *c; c++) + { + if (*c == '%') + { + switch (*++c) + { + case '%': + func (stream, "%%"); + break; + + case 'a': + if (((given & 0x000f0000) == 0x000f0000) + && ((given & 0x02000000) == 0)) + { + int offset = given & 0xfff; + + func (stream, "[pc"); + + if (given & 0x01000000) + { + if ((given & 0x00800000) == 0) + offset = - offset; + + /* Pre-indexed. */ + func (stream, ", #%d]", offset); + + offset += pc + 8; + + /* Cope with the possibility of write-back + being used. Probably a very dangerous thing + for the programmer to do, but who are we to + argue ? */ + if (given & 0x00200000) + func (stream, "!"); + } + else + { + /* Post indexed. */ + func (stream, "], #%d", offset); + + /* ie ignore the offset. */ + offset = pc + 8; + } + + func (stream, "\t; "); + info->print_address_func (offset, info); + } + else + { + func (stream, "[%s", + arm_regnames[(given >> 16) & 0xf]); + if ((given & 0x01000000) != 0) + { + if ((given & 0x02000000) == 0) + { + int offset = given & 0xfff; + if (offset) + func (stream, ", #%s%d", + (((given & 0x00800000) == 0) + ? "-" : ""), offset); + } + else + { + func (stream, ", %s", + (((given & 0x00800000) == 0) + ? "-" : "")); + arm_decode_shift (given, func, stream); + } + + func (stream, "]%s", + ((given & 0x00200000) != 0) ? "!" : ""); + } + else + { + if ((given & 0x02000000) == 0) + { + int offset = given & 0xfff; + if (offset) + func (stream, "], #%s%d", + (((given & 0x00800000) == 0) + ? "-" : ""), offset); + else + func (stream, "]"); + } + else + { + func (stream, "], %s", + (((given & 0x00800000) == 0) + ? "-" : "")); + arm_decode_shift (given, func, stream); + } + } + } + break; + + case 's': + if ((given & 0x004f0000) == 0x004f0000) + { + /* PC relative with immediate offset. */ + int offset = ((given & 0xf00) >> 4) | (given & 0xf); + + if ((given & 0x00800000) == 0) + offset = -offset; + + func (stream, "[pc, #%d]\t; ", offset); + + (*info->print_address_func) + (offset + pc + 8, info); + } + else + { + func (stream, "[%s", + arm_regnames[(given >> 16) & 0xf]); + if ((given & 0x01000000) != 0) + { + /* Pre-indexed. */ + if ((given & 0x00400000) == 0x00400000) + { + /* Immediate. */ + int offset = ((given & 0xf00) >> 4) | (given & 0xf); + if (offset) + func (stream, ", #%s%d", + (((given & 0x00800000) == 0) + ? "-" : ""), offset); + } + else + { + /* Register. */ + func (stream, ", %s%s", + (((given & 0x00800000) == 0) + ? "-" : ""), + arm_regnames[given & 0xf]); + } + + func (stream, "]%s", + ((given & 0x00200000) != 0) ? "!" : ""); + } + else + { + /* Post-indexed. */ + if ((given & 0x00400000) == 0x00400000) + { + /* Immediate. */ + int offset = ((given & 0xf00) >> 4) | (given & 0xf); + if (offset) + func (stream, "], #%s%d", + (((given & 0x00800000) == 0) + ? "-" : ""), offset); + else + func (stream, "]"); + } + else + { + /* Register. */ + func (stream, "], %s%s", + (((given & 0x00800000) == 0) + ? "-" : ""), + arm_regnames[given & 0xf]); + } + } + } + break; + + case 'b': + (*info->print_address_func) + (BDISP (given) * 4 + pc + 8, info); + break; + + case 'c': + func (stream, "%s", + arm_conditional [(given >> 28) & 0xf]); + break; + + case 'm': + { + int started = 0; + int reg; + + func (stream, "{"); + for (reg = 0; reg < 16; reg++) + if ((given & (1 << reg)) != 0) + { + if (started) + func (stream, ", "); + started = 1; + func (stream, "%s", arm_regnames[reg]); + } + func (stream, "}"); + } + break; + + case 'o': + if ((given & 0x02000000) != 0) + { + int rotate = (given & 0xf00) >> 7; + int immed = (given & 0xff); + immed = (((immed << (32 - rotate)) + | (immed >> rotate)) & 0xffffffff); + func (stream, "#%d\t; 0x%x", immed, immed); + } + else + arm_decode_shift (given, func, stream); + break; + + case 'p': + if ((given & 0x0000f000) == 0x0000f000) + func (stream, "p"); + break; + + case 't': + if ((given & 0x01200000) == 0x00200000) + func (stream, "t"); + break; + + case 'A': + func (stream, "[%s", arm_regnames [(given >> 16) & 0xf]); + + if ((given & (1 << 24)) != 0) + { + int offset = given & 0xff; + + if (offset) + func (stream, ", #%s%d]%s", + ((given & 0x00800000) == 0 ? "-" : ""), + offset * 4, + ((given & 0x00200000) != 0 ? "!" : "")); + else + func (stream, "]"); + } + else + { + int offset = given & 0xff; + + func (stream, "]"); + + if (given & (1 << 21)) + { + if (offset) + func (stream, ", #%s%d", + ((given & 0x00800000) == 0 ? "-" : ""), + offset * 4); + } + else + func (stream, ", {%d}", offset); + } + break; + + case 'B': + /* Print ARM V5 BLX(1) address: pc+25 bits. */ + { + bfd_vma address; + bfd_vma offset = 0; + + if (given & 0x00800000) + /* Is signed, hi bits should be ones. */ + offset = (-1) ^ 0x00ffffff; + + /* Offset is (SignExtend(offset field)<<2). */ + offset += given & 0x00ffffff; + offset <<= 2; + address = offset + pc + 8; + + if (given & 0x01000000) + /* H bit allows addressing to 2-byte boundaries. */ + address += 2; + + info->print_address_func (address, info); + } + break; + + case 'I': + /* Print a Cirrus/DSP shift immediate. */ + /* Immediates are 7bit signed ints with bits 0..3 in + bits 0..3 of opcode and bits 4..6 in bits 5..7 + of opcode. */ + { + int imm; + + imm = (given & 0xf) | ((given & 0xe0) >> 1); + + /* Is ``imm'' a negative number? */ + if (imm & 0x40) + imm |= (-1 << 7); + + func (stream, "%d", imm); + } + + break; + + case 'C': + func (stream, "_"); + if (given & 0x80000) + func (stream, "f"); + if (given & 0x40000) + func (stream, "s"); + if (given & 0x20000) + func (stream, "x"); + if (given & 0x10000) + func (stream, "c"); + break; + + case 'F': + switch (given & 0x00408000) + { + case 0: + func (stream, "4"); + break; + case 0x8000: + func (stream, "1"); + break; + case 0x00400000: + func (stream, "2"); + break; + default: + func (stream, "3"); + } + break; + + case 'P': + switch (given & 0x00080080) + { + case 0: + func (stream, "s"); + break; + case 0x80: + func (stream, "d"); + break; + case 0x00080000: + func (stream, "e"); + break; + default: + func (stream, _("<illegal precision>")); + break; + } + break; + case 'Q': + switch (given & 0x00408000) + { + case 0: + func (stream, "s"); + break; + case 0x8000: + func (stream, "d"); + break; + case 0x00400000: + func (stream, "e"); + break; + default: + func (stream, "p"); + break; + } + break; + case 'R': + switch (given & 0x60) + { + case 0: + break; + case 0x20: + func (stream, "p"); + break; + case 0x40: + func (stream, "m"); + break; + default: + func (stream, "z"); + break; + } + break; + + case '0': case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': + { + int bitstart = *c++ - '0'; + int bitend = 0; + while (*c >= '0' && *c <= '9') + bitstart = (bitstart * 10) + *c++ - '0'; + + switch (*c) + { + case '-': + c++; + + while (*c >= '0' && *c <= '9') + bitend = (bitend * 10) + *c++ - '0'; + + if (!bitend) + abort (); + + switch (*c) + { + case 'r': + { + long reg; + + reg = given >> bitstart; + reg &= (2 << (bitend - bitstart)) - 1; + + func (stream, "%s", arm_regnames[reg]); + } + break; + case 'd': + { + long reg; + + reg = given >> bitstart; + reg &= (2 << (bitend - bitstart)) - 1; + + func (stream, "%d", reg); + } + break; + case 'W': + { + long reg; + + reg = given >> bitstart; + reg &= (2 << (bitend - bitstart)) - 1; + + func (stream, "%d", reg + 1); + } + break; + case 'x': + { + long reg; + + reg = given >> bitstart; + reg &= (2 << (bitend - bitstart)) - 1; + + func (stream, "0x%08x", reg); + + /* Some SWI instructions have special + meanings. */ + if ((given & 0x0fffffff) == 0x0FF00000) + func (stream, "\t; IMB"); + else if ((given & 0x0fffffff) == 0x0FF00001) + func (stream, "\t; IMBRange"); + } + break; + case 'X': + { + long reg; + + reg = given >> bitstart; + reg &= (2 << (bitend - bitstart)) - 1; + + func (stream, "%01x", reg & 0xf); + } + break; + case 'f': + { + long reg; + + reg = given >> bitstart; + reg &= (2 << (bitend - bitstart)) - 1; + + if (reg > 7) + func (stream, "#%s", + arm_fp_const[reg & 7]); + else + func (stream, "f%d", reg); + } + break; + + case 'w': + { + long reg; + + if (bitstart != bitend) + { + reg = given >> bitstart; + reg &= (2 << (bitend - bitstart)) - 1; + if (bitend - bitstart == 1) + func (stream, "%s", iwmmxt_wwnames[reg]); + else + func (stream, "%s", iwmmxt_wwssnames[reg]); + } + else + { + reg = (((given >> 8) & 0x1) | + ((given >> 22) & 0x1)); + func (stream, "%s", iwmmxt_wwnames[reg]); + } + } + break; + + case 'g': + { + long reg; + int current_regnames; + + if (! iwmmxt_regnames) + iwmmxt_regnames = set_iwmmxt_regnames (); + current_regnames = set_arm_regname_option + (iwmmxt_regnames); + + reg = given >> bitstart; + reg &= (2 << (bitend - bitstart)) - 1; + func (stream, "%s", arm_regnames[reg]); + set_arm_regname_option (current_regnames); + } + break; + + case 'G': + { + long reg; + int current_regnames; + + if (! iwmmxt_regnames) + iwmmxt_regnames = set_iwmmxt_regnames (); + current_regnames = set_arm_regname_option + (iwmmxt_regnames + 1); + + reg = given >> bitstart; + reg &= (2 << (bitend - bitstart)) - 1; + func (stream, "%s", arm_regnames[reg]); + set_arm_regname_option (current_regnames); + } + break; + + default: + abort (); + } + break; + + case 'y': + case 'z': + { + int single = *c == 'y'; + int regno; + + switch (bitstart) + { + case 4: /* Sm pair */ + func (stream, "{"); + /* Fall through. */ + case 0: /* Sm, Dm */ + regno = given & 0x0000000f; + if (single) + { + regno <<= 1; + regno += (given >> 5) & 1; + } + break; + + case 1: /* Sd, Dd */ + regno = (given >> 12) & 0x0000000f; + if (single) + { + regno <<= 1; + regno += (given >> 22) & 1; + } + break; + + case 2: /* Sn, Dn */ + regno = (given >> 16) & 0x0000000f; + if (single) + { + regno <<= 1; + regno += (given >> 7) & 1; + } + break; + + case 3: /* List */ + func (stream, "{"); + regno = (given >> 12) & 0x0000000f; + if (single) + { + regno <<= 1; + regno += (given >> 22) & 1; + } + break; + + + default: + abort (); + } + + func (stream, "%c%d", single ? 's' : 'd', regno); + + if (bitstart == 3) + { + int count = given & 0xff; + + if (single == 0) + count >>= 1; + + if (--count) + { + func (stream, "-%c%d", + single ? 's' : 'd', + regno + count); + } + + func (stream, "}"); + } + else if (bitstart == 4) + func (stream, ", %c%d}", single ? 's' : 'd', + regno + 1); + + break; + } + + case '`': + c++; + if ((given & (1 << bitstart)) == 0) + func (stream, "%c", *c); + break; + case '\'': + c++; + if ((given & (1 << bitstart)) != 0) + func (stream, "%c", *c); + break; + case '?': + ++c; + if ((given & (1 << bitstart)) != 0) + func (stream, "%c", *c++); + else + func (stream, "%c", *++c); + break; + default: + abort (); + } + break; + + case 'L': + switch (given & 0x00400100) + { + case 0x00000000: func (stream, "b"); break; + case 0x00400000: func (stream, "h"); break; + case 0x00000100: func (stream, "w"); break; + case 0x00400100: func (stream, "d"); break; + default: + break; + } + break; + + case 'Z': + { + int value; + /* given (20, 23) | given (0, 3) */ + value = ((given >> 16) & 0xf0) | (given & 0xf); + func (stream, "%d", value); + } + break; + + case 'l': + /* This is like the 'A' operator, except that if + the width field "M" is zero, then the offset is + *not* multiplied by four. */ + { + int offset = given & 0xff; + int multiplier = (given & 0x00000100) ? 4 : 1; + + func (stream, "[%s", arm_regnames [(given >> 16) & 0xf]); + + if (offset) + { + if ((given & 0x01000000) != 0) + func (stream, ", #%s%d]%s", + ((given & 0x00800000) == 0 ? "-" : ""), + offset * multiplier, + ((given & 0x00200000) != 0 ? "!" : "")); + else + func (stream, "], #%s%d", + ((given & 0x00800000) == 0 ? "-" : ""), + offset * multiplier); + } + else + func (stream, "]"); + } + break; + + default: + abort (); + } + } + } + else + func (stream, "%c", *c); + } + return 4; + } + } + abort (); +} + +/* Print one instruction from PC on INFO->STREAM. + Return the size of the instruction. */ + +static int +print_insn_thumb (pc, info, given) + bfd_vma pc; + struct disassemble_info *info; + long given; +{ + const struct thumb_opcode *insn; + void *stream = info->stream; + fprintf_ftype func = info->fprintf_func; + + for (insn = thumb_opcodes; insn->assembler; insn++) + { + if ((given & insn->mask) == insn->value) + { + char * c = insn->assembler; + + /* Special processing for Thumb 2 instruction BL sequence: */ + if (!*c) /* Check for empty (not NULL) assembler string. */ + { + long offset; + + info->bytes_per_chunk = 4; + info->bytes_per_line = 4; + + offset = BDISP23 (given); + offset = offset * 2 + pc + 4; + + if ((given & 0x10000000) == 0) + { + func (stream, "blx\t"); + offset &= 0xfffffffc; + } + else + func (stream, "bl\t"); + + info->print_address_func (offset, info); + return 4; + } + else + { + info->bytes_per_chunk = 2; + info->bytes_per_line = 4; + + given &= 0xffff; + + for (; *c; c++) + { + if (*c == '%') + { + int domaskpc = 0; + int domasklr = 0; + + switch (*++c) + { + case '%': + func (stream, "%%"); + break; + + case 'S': + { + long reg; + + reg = (given >> 3) & 0x7; + if (given & (1 << 6)) + reg += 8; + + func (stream, "%s", arm_regnames[reg]); + } + break; + + case 'D': + { + long reg; + + reg = given & 0x7; + if (given & (1 << 7)) + reg += 8; + + func (stream, "%s", arm_regnames[reg]); + } + break; + + case 'T': + func (stream, "%s", + arm_conditional [(given >> 8) & 0xf]); + break; + + case 'N': + if (given & (1 << 8)) + domasklr = 1; + /* Fall through. */ + case 'O': + if (*c == 'O' && (given & (1 << 8))) + domaskpc = 1; + /* Fall through. */ + case 'M': + { + int started = 0; + int reg; + + func (stream, "{"); + + /* It would be nice if we could spot + ranges, and generate the rS-rE format: */ + for (reg = 0; (reg < 8); reg++) + if ((given & (1 << reg)) != 0) + { + if (started) + func (stream, ", "); + started = 1; + func (stream, "%s", arm_regnames[reg]); + } + + if (domasklr) + { + if (started) + func (stream, ", "); + started = 1; + func (stream, arm_regnames[14] /* "lr" */); + } + + if (domaskpc) + { + if (started) + func (stream, ", "); + func (stream, arm_regnames[15] /* "pc" */); + } + + func (stream, "}"); + } + break; + + + case '0': case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': + { + int bitstart = *c++ - '0'; + int bitend = 0; + + while (*c >= '0' && *c <= '9') + bitstart = (bitstart * 10) + *c++ - '0'; + + switch (*c) + { + case '-': + { + long reg; + + c++; + while (*c >= '0' && *c <= '9') + bitend = (bitend * 10) + *c++ - '0'; + if (!bitend) + abort (); + reg = given >> bitstart; + reg &= (2 << (bitend - bitstart)) - 1; + switch (*c) + { + case 'r': + func (stream, "%s", arm_regnames[reg]); + break; + + case 'd': + func (stream, "%d", reg); + break; + + case 'H': + func (stream, "%d", reg << 1); + break; + + case 'W': + func (stream, "%d", reg << 2); + break; + + case 'a': + /* PC-relative address -- the bottom two + bits of the address are dropped + before the calculation. */ + info->print_address_func + (((pc + 4) & ~3) + (reg << 2), info); + break; + + case 'x': + func (stream, "0x%04x", reg); + break; + + case 'I': + reg = ((reg ^ (1 << bitend)) - (1 << bitend)); + func (stream, "%d", reg); + break; + + case 'B': + reg = ((reg ^ (1 << bitend)) - (1 << bitend)); + (*info->print_address_func) + (reg * 2 + pc + 4, info); + break; + + default: + abort (); + } + } + break; + + case '\'': + c++; + if ((given & (1 << bitstart)) != 0) + func (stream, "%c", *c); + break; + + case '?': + ++c; + if ((given & (1 << bitstart)) != 0) + func (stream, "%c", *c++); + else + func (stream, "%c", *++c); + break; + + default: + abort (); + } + } + break; + + default: + abort (); + } + } + else + func (stream, "%c", *c); + } + } + return 2; + } + } + + /* No match. */ + abort (); +} + +/* Disallow mapping symbols ($a, $b, $d, $t etc) from + being displayed in symbol relative addresses. */ + +bfd_boolean +arm_symbol_is_valid (asymbol * sym, + struct disassemble_info * info ATTRIBUTE_UNUSED) +{ + const char * name; + + if (sym == NULL) + return FALSE; + + name = bfd_asymbol_name (sym); + + return (name && *name != '$'); +} + +/* Parse an individual disassembler option. */ + +void +parse_arm_disassembler_option (option) + char * option; +{ + if (option == NULL) + return; + + if (strneq (option, "reg-names-", 10)) + { + int i; + + option += 10; + + for (i = NUM_ARM_REGNAMES; i--;) + if (strneq (option, regnames[i].name, strlen (regnames[i].name))) + { + regname_selected = i; + break; + } + + if (i < 0) + /* XXX - should break 'option' at following delimiter. */ + fprintf (stderr, _("Unrecognised register name set: %s\n"), option); + } + else if (strneq (option, "force-thumb", 11)) + force_thumb = 1; + else if (strneq (option, "no-force-thumb", 14)) + force_thumb = 0; + else + /* XXX - should break 'option' at following delimiter. */ + fprintf (stderr, _("Unrecognised disassembler option: %s\n"), option); + + return; +} + +/* Parse the string of disassembler options, spliting it at whitespaces + or commas. (Whitespace separators supported for backwards compatibility). */ + +static void +parse_disassembler_options (options) + char * options; +{ + if (options == NULL) + return; + + while (*options) + { + parse_arm_disassembler_option (options); + + /* Skip forward to next seperator. */ + while ((*options) && (! ISSPACE (*options)) && (*options != ',')) + ++ options; + /* Skip forward past seperators. */ + while (ISSPACE (*options) || (*options == ',')) + ++ options; + } +} + +/* NOTE: There are no checks in these routines that + the relevant number of data bytes exist. */ + +static int +print_insn (pc, info, little) + bfd_vma pc; + struct disassemble_info * info; + bfd_boolean little; +{ + unsigned char b[4]; + long given; + int status; + int is_thumb; + + if (info->disassembler_options) + { + parse_disassembler_options (info->disassembler_options); + + /* To avoid repeated parsing of these options, we remove them here. */ + info->disassembler_options = NULL; + } + + is_thumb = force_thumb; + + if (!is_thumb && info->symbols != NULL) + { + if (bfd_asymbol_flavour (*info->symbols) == bfd_target_coff_flavour) + { + coff_symbol_type * cs; + + cs = coffsymbol (*info->symbols); + is_thumb = ( cs->native->u.syment.n_sclass == C_THUMBEXT + || cs->native->u.syment.n_sclass == C_THUMBSTAT + || cs->native->u.syment.n_sclass == C_THUMBLABEL + || cs->native->u.syment.n_sclass == C_THUMBEXTFUNC + || cs->native->u.syment.n_sclass == C_THUMBSTATFUNC); + } + else if (bfd_asymbol_flavour (*info->symbols) == bfd_target_elf_flavour) + { + elf_symbol_type * es; + unsigned int type; + + es = *(elf_symbol_type **)(info->symbols); + type = ELF_ST_TYPE (es->internal_elf_sym.st_info); + + is_thumb = (type == STT_ARM_TFUNC) || (type == STT_ARM_16BIT); + } + } + + info->bytes_per_chunk = 4; + info->display_endian = little ? BFD_ENDIAN_LITTLE : BFD_ENDIAN_BIG; + + if (little) + { + status = info->read_memory_func (pc, (bfd_byte *) &b[0], 4, info); + if (status != 0 && is_thumb) + { + info->bytes_per_chunk = 2; + + status = info->read_memory_func (pc, (bfd_byte *) b, 2, info); + b[3] = b[2] = 0; + } + + if (status != 0) + { + info->memory_error_func (status, pc, info); + return -1; + } + + given = (b[0]) | (b[1] << 8) | (b[2] << 16) | (b[3] << 24); + } + else + { + status = info->read_memory_func + (pc & ~ 0x3, (bfd_byte *) &b[0], 4, info); + if (status != 0) + { + info->memory_error_func (status, pc, info); + return -1; + } + + if (is_thumb) + { + if (pc & 0x2) + { + given = (b[2] << 8) | b[3]; + + status = info->read_memory_func + ((pc + 4) & ~ 0x3, (bfd_byte *) b, 4, info); + if (status != 0) + { + info->memory_error_func (status, pc + 4, info); + return -1; + } + + given |= (b[0] << 24) | (b[1] << 16); + } + else + given = (b[0] << 8) | b[1] | (b[2] << 24) | (b[3] << 16); + } + else + given = (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | (b[3]); + } + + if (info->flags & INSN_HAS_RELOC) + /* If the instruction has a reloc associated with it, then + the offset field in the instruction will actually be the + addend for the reloc. (We are using REL type relocs). + In such cases, we can ignore the pc when computing + addresses, since the addend is not currently pc-relative. */ + pc = 0; + + if (is_thumb) + status = print_insn_thumb (pc, info, given); + else + status = print_insn_arm (pc, info, given); + + return status; +} + +int +print_insn_big_arm (pc, info) + bfd_vma pc; + struct disassemble_info * info; +{ + return print_insn (pc, info, FALSE); +} + +int +print_insn_little_arm (pc, info) + bfd_vma pc; + struct disassemble_info * info; +{ + return print_insn (pc, info, TRUE); +} + +void +print_arm_disassembler_options (FILE * stream) +{ + int i; + + fprintf (stream, _("\n\ +The following ARM specific disassembler options are supported for use with\n\ +the -M switch:\n")); + + for (i = NUM_ARM_REGNAMES; i--;) + fprintf (stream, " reg-names-%s %*c%s\n", + regnames[i].name, + (int)(14 - strlen (regnames[i].name)), ' ', + regnames[i].description); + + fprintf (stream, " force-thumb Assume all insns are Thumb insns\n"); + fprintf (stream, " no-force-thumb Examine preceeding label to determine an insn's type\n\n"); +} |
