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Diffstat (limited to 'gdb/vax-tdep.c')
| -rw-r--r-- | gdb/vax-tdep.c | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/gdb/vax-tdep.c b/gdb/vax-tdep.c new file mode 100644 index 0000000..b378571 --- /dev/null +++ b/gdb/vax-tdep.c @@ -0,0 +1,263 @@ +/* Print VAX instructions for GDB, the GNU debugger. + Copyright 1986, 1989, 1991, 1992, 1996 Free Software Foundation, Inc. + +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 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 "defs.h" +#include "symtab.h" +#include "opcode/vax.h" + +/* Vax instructions are never longer than this. */ +#define MAXLEN 62 + +/* Number of elements in the opcode table. */ +#define NOPCODES (sizeof votstrs / sizeof votstrs[0]) + +static unsigned char *print_insn_arg (); + +/* Print the vax instruction at address MEMADDR in debugged memory, + from disassembler info INFO. + Returns length of the instruction, in bytes. */ + +static int +vax_print_insn (memaddr, info) + CORE_ADDR memaddr; + disassemble_info *info; +{ + unsigned char buffer[MAXLEN]; + register int i; + register unsigned char *p; + register char *d; + + int status = (*info->read_memory_func) (memaddr, buffer, MAXLEN, info); + if (status != 0) + { + (*info->memory_error_func) (status, memaddr, info); + return -1; + } + + for (i = 0; i < NOPCODES; i++) + if (votstrs[i].detail.code == buffer[0] + || votstrs[i].detail.code == *(unsigned short *)buffer) + break; + + /* Handle undefined instructions. */ + if (i == NOPCODES) + { + (*info->fprintf_func) (info->stream, "0%o", buffer[0]); + return 1; + } + + (*info->fprintf_func) (info->stream, "%s", votstrs[i].name); + + /* Point at first byte of argument data, + and at descriptor for first argument. */ + p = buffer + 1 + (votstrs[i].detail.code >= 0x100); + d = votstrs[i].detail.args; + + if (*d) + (*info->fprintf_func) (info->stream, " "); + + while (*d) + { + p = print_insn_arg (d, p, memaddr + (p - buffer), info); + d += 2; + if (*d) + (*info->fprintf_func) (info->stream, ","); + } + return p - buffer; +} + +static unsigned char * +print_insn_arg (d, p, addr, info) + char *d; + register char *p; + CORE_ADDR addr; + disassemble_info *info; +{ + register int regnum = *p & 0xf; + float floatlitbuf; + + if (*d == 'b') + { + if (d[1] == 'b') + (*info->fprintf_func) (info->stream, "0x%x", addr + *p++ + 1); + else + { + (*info->fprintf_func) (info->stream, "0x%x", addr + *(short *)p + 2); + p += 2; + } + } + else + switch ((*p++ >> 4) & 0xf) + { + case 0: + case 1: + case 2: + case 3: /* Literal mode */ + if (d[1] == 'd' || d[1] == 'f' || d[1] == 'g' || d[1] == 'h') + { + *(int *)&floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4); + (*info->fprintf_func) (info->stream, "$%f", floatlitbuf); + } + else + (*info->fprintf_func) (info->stream, "$%d", p[-1] & 0x3f); + break; + + case 4: /* Indexed */ + p = (char *) print_insn_arg (d, p, addr + 1, info); + (*info->fprintf_func) (info->stream, "[%s]", REGISTER_NAME (regnum)); + break; + + case 5: /* Register */ + (*info->fprintf_func) (info->stream, REGISTER_NAME (regnum)); + break; + + case 7: /* Autodecrement */ + (*info->fprintf_func) (info->stream, "-"); + case 6: /* Register deferred */ + (*info->fprintf_func) (info->stream, "(%s)", REGISTER_NAME (regnum)); + break; + + case 9: /* Autoincrement deferred */ + (*info->fprintf_func) (info->stream, "@"); + if (regnum == PC_REGNUM) + { + (*info->fprintf_func) (info->stream, "#"); + info->target = *(long *)p; + (*info->print_address_func) (info->target, info); + p += 4; + break; + } + case 8: /* Autoincrement */ + if (regnum == PC_REGNUM) + { + (*info->fprintf_func) (info->stream, "#"); + switch (d[1]) + { + case 'b': + (*info->fprintf_func) (info->stream, "%d", *p++); + break; + + case 'w': + (*info->fprintf_func) (info->stream, "%d", *(short *)p); + p += 2; + break; + + case 'l': + (*info->fprintf_func) (info->stream, "%d", *(long *)p); + p += 4; + break; + + case 'q': + (*info->fprintf_func) (info->stream, "0x%x%08x", + ((long *)p)[1], ((long *)p)[0]); + p += 8; + break; + + case 'o': + (*info->fprintf_func) (info->stream, "0x%x%08x%08x%08x", + ((long *)p)[3], ((long *)p)[2], + ((long *)p)[1], ((long *)p)[0]); + p += 16; + break; + + case 'f': + if (INVALID_FLOAT (p, 4)) + (*info->fprintf_func) (info->stream, + "<<invalid float 0x%x>>", + *(int *) p); + else + (*info->fprintf_func) (info->stream, "%f", *(float *) p); + p += 4; + break; + + case 'd': + if (INVALID_FLOAT (p, 8)) + (*info->fprintf_func) (info->stream, + "<<invalid float 0x%x%08x>>", + ((long *)p)[1], ((long *)p)[0]); + else + (*info->fprintf_func) (info->stream, "%f", *(double *) p); + p += 8; + break; + + case 'g': + (*info->fprintf_func) (info->stream, "g-float"); + p += 8; + break; + + case 'h': + (*info->fprintf_func) (info->stream, "h-float"); + p += 16; + break; + + } + } + else + (*info->fprintf_func) (info->stream, "(%s)+", REGISTER_NAME (regnum)); + break; + + case 11: /* Byte displacement deferred */ + (*info->fprintf_func) (info->stream, "@"); + case 10: /* Byte displacement */ + if (regnum == PC_REGNUM) + { + info->target = addr + *p + 2; + (*info->print_address_func) (info->target, info); + } + else + (*info->fprintf_func) (info->stream, "%d(%s)", *p, REGISTER_NAME (regnum)); + p += 1; + break; + + case 13: /* Word displacement deferred */ + (*info->fprintf_func) (info->stream, "@"); + case 12: /* Word displacement */ + if (regnum == PC_REGNUM) + { + info->target = addr + *(short *)p + 3; + (*info->print_address_func) (info->target, info); + } + else + (*info->fprintf_func) (info->stream, "%d(%s)", + *(short *)p, REGISTER_NAME (regnum)); + p += 2; + break; + + case 15: /* Long displacement deferred */ + (*info->fprintf_func) (info->stream, "@"); + case 14: /* Long displacement */ + if (regnum == PC_REGNUM) + { + info->target = addr + *(short *)p + 5; + (*info->print_address_func) (info->target, info); + } + else + (*info->fprintf_func) (info->stream, "%d(%s)", + *(long *)p, REGISTER_NAME (regnum)); + p += 4; + } + + return (unsigned char *) p; +} + +void +_initialize_vax_tdep () +{ + tm_print_insn = vax_print_insn; +} |