/* Print VAX instructions.
- Copyright 1995, 1998, 2000, 2001 Free Software Foundation, Inc.
+ Copyright (C) 1995-2021 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 file is part of the GNU opcodes library.
-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.
+ This library 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 3, or (at your option)
+ any later version.
-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. */
+ It 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., 51 Franklin Street - Fifth Floor, Boston,
+ MA 02110-1301, USA. */
#include "sysdep.h"
+#include <setjmp.h>
+#include <string.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 ((int, unsigned char *, bfd_vma, disassemble_info *));
-
+#include "disassemble.h"
static char *reg_names[] =
{
"r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc"
};
+/* Definitions for the function entry mask bits. */
+static char *entry_mask_bit[] =
+{
+ /* Registers 0 and 1 shall not be saved, since they're used to pass back
+ a function's result to its caller... */
+ "~r0~", "~r1~",
+ /* Registers 2 .. 11 are normal registers. */
+ "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11",
+ /* Registers 12 and 13 are argument and frame pointer and must not
+ be saved by using the entry mask. */
+ "~ap~", "~fp~",
+ /* Bits 14 and 15 control integer and decimal overflow. */
+ "IntOvfl", "DecOvfl",
+};
+
/* 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) \
#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])))
+ (COERCE32 (((((((unsigned) 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;
+ bfd_byte * max_fetched;
+ bfd_byte the_buffer[MAXLEN];
+ bfd_vma insn_start;
+ OPCODES_SIGJMP_BUF bailout;
};
/* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive)
? 1 : fetch_data ((info), (addr)))
static int
-fetch_data (info, addr)
- struct disassemble_info *info;
- bfd_byte *addr;
+fetch_data (struct disassemble_info *info, bfd_byte *addr)
{
int status;
struct private *priv = (struct private *) info->private_data;
if (status != 0)
{
(*info->memory_error_func) (status, start, info);
- longjmp (priv->bailout, 1);
+ OPCODES_SIGLONGJMP (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;
+/* Entry mask handling. */
+static unsigned int entry_addr_occupied_slots = 0;
+static unsigned int entry_addr_total_slots = 0;
+static bfd_vma * entry_addr = NULL;
- info->private_data = (PTR) &priv;
- priv.max_fetched = priv.the_buffer;
- priv.insn_start = memaddr;
- if (setjmp (priv.bailout) != 0)
- {
- /* Error return. */
- return -1;
- }
+/* Parse the VAX specific disassembler options. These contain function
+ entry addresses, which can be useful to disassemble ROM images, since
+ there's no symbol table. Returns TRUE upon success, FALSE otherwise. */
- /* 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;
- }
+static bfd_boolean
+parse_disassembler_options (const char *options)
+{
+ const char * entry_switch = "entry:";
- for (votp = &votstrs[0]; votp->name[0]; votp++)
+ while ((options = strstr (options, entry_switch)))
{
- register vax_opcodeT opcode = votp->detail.code;
+ options += strlen (entry_switch);
- /* 2 byte codes match 2 buffer pos. */
- if ((bfd_byte) opcode == buffer[0]
- && (opcode >> 8 == 0 || opcode >> 8 == buffer[1]))
+ /* The greater-than part of the test below is paranoia. */
+ if (entry_addr_occupied_slots >= entry_addr_total_slots)
{
- 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;
- }
+ /* A guesstimate of the number of entries we will have to create. */
+ entry_addr_total_slots
+ += 1 + strlen (options) / (strlen (entry_switch) + 5);
- /* 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);
+ entry_addr = realloc (entry_addr, sizeof (bfd_vma)
+ * entry_addr_total_slots);
+ }
- (*info->fprintf_func) (info->stream, "%s", votp->name);
- if (*argp)
- (*info->fprintf_func) (info->stream, " ");
+ if (entry_addr == NULL)
+ return FALSE;
- while (*argp)
- {
- arg += print_insn_arg (argp, arg, memaddr + arg - buffer, info);
- argp += 2;
- if (*argp)
- (*info->fprintf_func) (info->stream, ",");
+ entry_addr[entry_addr_occupied_slots] = bfd_scan_vma (options, NULL, 0);
+ entry_addr_occupied_slots ++;
}
- return arg - buffer;
+ return TRUE;
}
-/* 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;
+#if 0 /* FIXME: Ideally the disassembler should have target specific
+ initialisation and termination function pointers. Then
+ parse_disassembler_options could be the init function and
+ free_entry_array (below) could be the termination routine.
+ Until then there is no way for the disassembler to tell us
+ that it has finished and that we no longer need the entry
+ array, so this routine is suppressed for now. It does mean
+ that we leak memory, but only to the extent that we do not
+ free it just before the disassembler is about to terminate
+ anyway. */
+
+/* Free memory allocated to our entry array. */
+
+static void
+free_entry_array (void)
{
- int arg_len;
-
- /* check validity of addressing length */
- switch (d[1])
+ if (entry_addr)
{
- 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();
+ free (entry_addr);
+ entry_addr = NULL;
+ entry_addr_occupied_slots = entry_addr_total_slots = 0;
}
+}
+#endif
+/* Check if the given address is a known function entry point. This is
+ the case if there is a symbol of the function type at this address.
+ We also check for synthetic symbols as these are used for PLT entries
+ (weak undefined symbols may not have the function type set). Finally
+ the address may have been forced to be treated as an entry point. The
+ latter helps in disassembling ROM images, because there's no symbol
+ table at all. Forced entry points can be given by supplying several
+ -M options to objdump: -M entry:0xffbb7730. */
+
+static bfd_boolean
+is_function_entry (struct disassemble_info *info, bfd_vma addr)
+{
+ unsigned int i;
- /* branches have no mode byte */
- if (d[0] == 'b')
- {
- unsigned char *p = p0;
+ /* Check if there's a function or PLT symbol at our address. */
+ if (info->symbols
+ && info->symbols[0]
+ && (info->symbols[0]->flags & (BSF_FUNCTION | BSF_SYNTHETIC))
+ && addr == bfd_asymbol_value (info->symbols[0]))
+ return TRUE;
- if (arg_len == 1)
- (*info->print_address_func) (addr + 1 + NEXTBYTE (p), info);
- else
- (*info->print_address_func) (addr + 2 + NEXTWORD (p), info);
+ /* Check for forced function entry address. */
+ for (i = entry_addr_occupied_slots; i--;)
+ if (entry_addr[i] == addr)
+ return TRUE;
- return p - p0;
- }
+ return FALSE;
+}
- return print_insn_mode (arg_len, p0, addr, info);
+/* Check if the given address is the last longword of a PLT entry.
+ This longword is data and depending on the value it may interfere
+ with disassembly of further PLT entries. We make use of the fact
+ PLT symbols are marked BSF_SYNTHETIC. */
+static bfd_boolean
+is_plt_tail (struct disassemble_info *info, bfd_vma addr)
+{
+ if (info->symbols
+ && info->symbols[0]
+ && (info->symbols[0]->flags & BSF_SYNTHETIC)
+ && addr == bfd_asymbol_value (info->symbols[0]) + 8)
+ return TRUE;
+
+ return FALSE;
}
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;
+print_insn_mode (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 */
+ /* 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);
+ 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 (size, p0 + 1, addr + 1, info);
- (*info->fprintf_func) (info->stream, "[%s]", reg_names[reg]);
+ case 0x40: /* Index: base-addr[Rn] */
+ {
+ unsigned char *q = p0 + 1;
+ unsigned char nextmode = NEXTBYTE (q);
+ if (nextmode < 0x60 || nextmode == 0x8f)
+ /* Literal, index, register, or immediate is invalid. In
+ particular don't recurse into another index mode which
+ might overflow the_buffer. */
+ (*info->fprintf_func) (info->stream, "[invalid base]");
+ else
+ 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 */
+ case 0x50: /* Register: Rn */
(*info->fprintf_func) (info->stream, "%s", reg_names[reg]);
break;
- case 0x60: /* register deferred: (Rn) */
+ case 0x60: /* Register deferred: (Rn) */
(*info->fprintf_func) (info->stream, "(%s)", reg_names[reg]);
break;
- case 0x70: /* autodecrement: -(Rn) */
+ case 0x70: /* Autodecrement: -(Rn) */
(*info->fprintf_func) (info->stream, "-(%s)", reg_names[reg]);
break;
- case 0x80: /* autoincrement: (Rn)+ */
+ case 0x80: /* Autoincrement: (Rn)+ */
if (reg == 0xF)
- { /* immediate? */
+ { /* 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]);
+ 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)+ */
+ 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) */
+ case 0xB0: /* Displacement byte deferred: *displ(Rn). */
(*info->fprintf_func) (info->stream, "*");
- case 0xA0: /* displacement byte: displ(Rn) */
+ /* Fall through. */
+ 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) */
+ case 0xD0: /* Displacement word deferred: *displ(Rn). */
(*info->fprintf_func) (info->stream, "*");
- case 0xC0: /* displacement word: displ(Rn) */
+ /* Fall through. */
+ 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) */
+ case 0xF0: /* Displacement long deferred: *displ(Rn). */
(*info->fprintf_func) (info->stream, "*");
- case 0xE0: /* displacement long: displ(Rn) */
+ /* Fall through. */
+ case 0xE0: /* Displacement long: displ(Rn). */
if (reg == 0xF)
(*info->print_address_func) (addr + 5 + NEXTLONG (p), info);
else
return p - p0;
}
+
+/* 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 (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);
+}
+
+/* Print the vax instruction at address MEMADDR in debugged memory,
+ on INFO->STREAM. Returns length of the instruction, in bytes. */
+
+int
+print_insn_vax (bfd_vma memaddr, disassemble_info *info)
+{
+ static bfd_boolean parsed_disassembler_options = FALSE;
+ const struct vot *votp;
+ const char *argp;
+ unsigned char *arg;
+ struct private priv;
+ bfd_byte *buffer = priv.the_buffer;
+
+ info->private_data = & priv;
+ priv.max_fetched = priv.the_buffer;
+ priv.insn_start = memaddr;
+
+ if (! parsed_disassembler_options
+ && info->disassembler_options != NULL)
+ {
+ parse_disassembler_options (info->disassembler_options);
+
+ /* To avoid repeated parsing of these options. */
+ parsed_disassembler_options = TRUE;
+ }
+
+ if (OPCODES_SIGSETJMP (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
+ && (info->stop_vma == 0 || memaddr < (info->stop_vma - 1)))
+ {
+ FETCH_DATA (info, buffer + 2);
+ }
+ else
+ {
+ FETCH_DATA (info, buffer + 1);
+ buffer[1] = 0;
+ }
+
+ /* Decode function entry mask. */
+ if (is_function_entry (info, memaddr))
+ {
+ int i = 0;
+ int register_mask = buffer[1] << 8 | buffer[0];
+
+ (*info->fprintf_func) (info->stream, ".word 0x%04x # Entry mask: <",
+ register_mask);
+
+ for (i = 15; i >= 0; i--)
+ if (register_mask & (1 << i))
+ (*info->fprintf_func) (info->stream, " %s", entry_mask_bit[i]);
+
+ (*info->fprintf_func) (info->stream, " >");
+
+ return 2;
+ }
+
+ /* Decode PLT entry offset longword. */
+ if (is_plt_tail (info, memaddr))
+ {
+ int offset;
+
+ FETCH_DATA (info, buffer + 4);
+ offset = ((unsigned) buffer[3] << 24 | buffer[2] << 16
+ | buffer[1] << 8 | buffer[0]);
+ (*info->fprintf_func) (info->stream, ".long 0x%08x", offset);
+
+ return 4;
+ }
+
+ for (votp = &votstrs[0]; votp->name[0]; votp++)
+ {
+ 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;
+}
+
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