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-rw-r--r--opcodes/vax-dis.c299
1 files changed, 299 insertions, 0 deletions
diff --git a/opcodes/vax-dis.c b/opcodes/vax-dis.c
new file mode 100644
index 00000000000..54b59f30d40
--- /dev/null
+++ b/opcodes/vax-dis.c
@@ -0,0 +1,299 @@
+/* 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 "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;
+}
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