| /* Print VAX instructions. |
| Copyright 1995, 1998, 2000, 2001, 2002 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 fetch_data PARAMS ((struct disassemble_info *, bfd_byte *)); |
| static int print_insn_arg |
| PARAMS ((const char *, unsigned char *, bfd_vma, disassemble_info *)); |
| static int print_insn_mode |
| PARAMS ((const char *, 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; |
| 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; |
| } |
| |
| argp = NULL; |
| /* Check if the info buffer has more than one byte left since |
| the last opcode might be a single byte with no argument data. */ |
| if (info->buffer_length - (memaddr - info->buffer_vma) > 1) |
| { |
| FETCH_DATA (info, buffer + 2); |
| } |
| else |
| { |
| FETCH_DATA (info, buffer + 1); |
| buffer[1] = 0; |
| } |
| |
| 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 (d, arg_len, p0, addr, info); |
| } |
| |
| static int |
| print_insn_mode (d, size, p0, addr, info) |
| const char *d; |
| 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 */ |
| if (d[1] == 'd' || d[1] == 'f' || d[1] == 'g' || d[1] == 'h') |
| (*info->fprintf_func) (info->stream, "$0x%x [%c-float]", mode, d[1]); |
| else |
| (*info->fprintf_func) (info->stream, "$0x%x", mode); |
| break; |
| case 0x40: /* index: base-addr[Rn] */ |
| p += print_insn_mode (d, 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"); |
| if (d[1] == 'd' || d[1] == 'f' || d[1] == 'g' || d[1] == 'h') |
| { |
| int float_word; |
| |
| float_word = p[0] | (p[1] << 8); |
| if ((d[1] == 'd' || d[1] == 'f') |
| && (float_word & 0xff80) == 0x8000) |
| { |
| (*info->fprintf_func) (info->stream, "[invalid %c-float]", |
| d[1]); |
| } |
| else |
| { |
| for (i = 0; i < size; i++) |
| (*info->fprintf_func) (info->stream, "%02x", |
| p[size - i - 1]); |
| (*info->fprintf_func) (info->stream, " [%c-float]", d[1]); |
| } |
| } |
| else |
| { |
| 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; |
| } |