/* Print VAX instructions. Copyright (C) 1995, 1998 Free Software Foundation, Inc. Contributed by Pauline Middelink <middelin@polyware.iaf.nl> 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 "opcode/vax.h" #include "dis-asm.h" /* Local function prototypes */ static int print_insn_arg PARAMS ((const char *, unsigned char *, bfd_vma, disassemble_info *)); static int print_insn_mode PARAMS ((int, unsigned char *, bfd_vma, disassemble_info *)); static char *reg_names[] = { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc" }; /* Sign-extend an (unsigned char). */ #if __STDC__ == 1 #define COERCE_SIGNED_CHAR(ch) ((signed char)(ch)) #else #define COERCE_SIGNED_CHAR(ch) ((int)(((ch) ^ 0x80) & 0xFF) - 128) #endif /* Get a 1 byte signed integer. */ #define NEXTBYTE(p) \ (p += 1, FETCH_DATA (info, p), \ COERCE_SIGNED_CHAR(p[-1])) /* Get a 2 byte signed integer. */ #define COERCE16(x) ((int) (((x) ^ 0x8000) - 0x8000)) #define NEXTWORD(p) \ (p += 2, FETCH_DATA (info, p), \ COERCE16 ((p[-1] << 8) + p[-2])) /* Get a 4 byte signed integer. */ #define COERCE32(x) ((int) (((x) ^ 0x80000000) - 0x80000000)) #define NEXTLONG(p) \ (p += 4, FETCH_DATA (info, p), \ (COERCE32 ((((((p[-1] << 8) + p[-2]) << 8) + p[-3]) << 8) + p[-4]))) /* Maximum length of an instruction. */ #define MAXLEN 25 #include <setjmp.h> struct private { /* Points to first byte not fetched. */ bfd_byte *max_fetched; bfd_byte the_buffer[MAXLEN]; bfd_vma insn_start; jmp_buf bailout; }; /* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive) to ADDR (exclusive) are valid. Returns 1 for success, longjmps on error. */ #define FETCH_DATA(info, addr) \ ((addr) <= ((struct private *)(info->private_data))->max_fetched \ ? 1 : fetch_data ((info), (addr))) static int fetch_data (info, addr) struct disassemble_info *info; bfd_byte *addr; { int status; struct private *priv = (struct private *) info->private_data; bfd_vma start = priv->insn_start + (priv->max_fetched - priv->the_buffer); status = (*info->read_memory_func) (start, priv->max_fetched, addr - priv->max_fetched, info); if (status != 0) { (*info->memory_error_func) (status, start, info); longjmp (priv->bailout, 1); } else priv->max_fetched = addr; return 1; } /* Print the vax instruction at address MEMADDR in debugged memory, on INFO->STREAM. Returns length of the instruction, in bytes. */ int print_insn_vax (memaddr, info) bfd_vma memaddr; disassemble_info *info; { const struct vot *votp; const char *argp = NULL; unsigned char *arg; struct private priv; bfd_byte *buffer = priv.the_buffer; info->private_data = (PTR) &priv; priv.max_fetched = priv.the_buffer; priv.insn_start = memaddr; if (setjmp (priv.bailout) != 0) { /* Error return. */ return -1; } FETCH_DATA (info, buffer + 2); for (votp = &votstrs[0]; votp->name[0]; votp++) { register vax_opcodeT opcode = votp->detail.code; /* 2 byte codes match 2 buffer pos. */ if ((bfd_byte) opcode == buffer[0] && (opcode >> 8 == 0 || opcode >> 8 == buffer[1])) { argp = votp->detail.args; break; } } if (argp == NULL) { /* Handle undefined instructions. */ (*info->fprintf_func) (info->stream, ".word 0x%x", (buffer[0] << 8) + buffer[1]); return 2; } /* Point at first byte of argument data, and at descriptor for first argument. */ arg = buffer + ((votp->detail.code >> 8) ? 2 : 1); /* Make sure we have it in mem */ FETCH_DATA (info, arg); (*info->fprintf_func) (info->stream, "%s", votp->name); if (*argp) (*info->fprintf_func) (info->stream, " "); while (*argp) { arg += print_insn_arg (argp, arg, memaddr + arg - buffer, info); argp += 2; if (*argp) (*info->fprintf_func) (info->stream, ","); } return arg - buffer; } /* Returns number of bytes "eaten" by the operand, or return -1 if an invalid operand was found, or -2 if an opcode tabel error was found. */ static int print_insn_arg (d, p0, addr, info) const char *d; unsigned char *p0; bfd_vma addr; /* PC for this arg to be relative to */ disassemble_info *info; { int arg_len; /* check validity of addressing length */ switch (d[1]) { case 'b' : arg_len = 1; break; case 'd' : arg_len = 8; break; case 'f' : arg_len = 4; break; case 'g' : arg_len = 8; break; case 'h' : arg_len = 16; break; case 'l' : arg_len = 4; break; case 'o' : arg_len = 16; break; case 'w' : arg_len = 2; break; case 'q' : arg_len = 8; break; default : abort(); } /* branches have no mode byte */ if (d[0] == 'b') { unsigned char *p = p0; if (arg_len == 1) (*info->print_address_func) (addr + 1 + NEXTBYTE (p), info); else (*info->print_address_func) (addr + 2 + NEXTWORD (p), info); return p - p0; } return print_insn_mode (arg_len, p0, addr, info); } static int print_insn_mode (size, p0, addr, info) int size; unsigned char *p0; bfd_vma addr; /* PC for this arg to be relative to */ disassemble_info *info; { unsigned char *p = p0; unsigned char mode, reg; /* fetch and interpret mode byte */ mode = (unsigned char) NEXTBYTE (p); reg = mode & 0xF; switch (mode & 0xF0) { case 0x00: case 0x10: case 0x20: case 0x30: /* literal mode $number */ (*info->fprintf_func) (info->stream, "$0x%x", mode); break; case 0x40: /* index: base-addr[Rn] */ p += print_insn_mode (size, p0 + 1, addr + 1, info); (*info->fprintf_func) (info->stream, "[%s]", reg_names[reg]); break; case 0x50: /* register: Rn */ (*info->fprintf_func) (info->stream, "%s", reg_names[reg]); break; case 0x60: /* register deferred: (Rn) */ (*info->fprintf_func) (info->stream, "(%s)", reg_names[reg]); break; case 0x70: /* autodecrement: -(Rn) */ (*info->fprintf_func) (info->stream, "-(%s)", reg_names[reg]); break; case 0x80: /* autoincrement: (Rn)+ */ if (reg == 0xF) { /* immediate? */ int i; FETCH_DATA (info, p + size); (*info->fprintf_func) (info->stream, "$0x"); for (i = 0; i < size; i++) (*info->fprintf_func) (info->stream, "%02x", p[size - i - 1]); p += size; } else (*info->fprintf_func) (info->stream, "(%s)+", reg_names[reg]); break; case 0x90: /* autoincrement deferred: @(Rn)+ */ if (reg == 0xF) (*info->fprintf_func) (info->stream, "*0x%x", NEXTLONG (p)); else (*info->fprintf_func) (info->stream, "@(%s)+", reg_names[reg]); break; case 0xB0: /* displacement byte deferred: *displ(Rn) */ (*info->fprintf_func) (info->stream, "*"); case 0xA0: /* displacement byte: displ(Rn) */ if (reg == 0xF) (*info->print_address_func) (addr + 2 + NEXTBYTE (p), info); else (*info->fprintf_func) (info->stream, "0x%x(%s)", NEXTBYTE (p), reg_names[reg]); break; case 0xD0: /* displacement word deferred: *displ(Rn) */ (*info->fprintf_func) (info->stream, "*"); case 0xC0: /* displacement word: displ(Rn) */ if (reg == 0xF) (*info->print_address_func) (addr + 3 + NEXTWORD (p), info); else (*info->fprintf_func) (info->stream, "0x%x(%s)", NEXTWORD (p), reg_names[reg]); break; case 0xF0: /* displacement long deferred: *displ(Rn) */ (*info->fprintf_func) (info->stream, "*"); case 0xE0: /* displacement long: displ(Rn) */ if (reg == 0xF) (*info->print_address_func) (addr + 5 + NEXTLONG (p), info); else (*info->fprintf_func) (info->stream, "0x%x(%s)", NEXTLONG (p), reg_names[reg]); break; } return p - p0; }