-/* Print VAX instructions for GDB, the GNU debugger.
- Copyright 1986, 1989, 1991, 1992, 1995, 1996, 1998, 1999, 2000, 2002
- Free Software Foundation, Inc.
+/* Target-dependent code for the VAX.
+
+ Copyright (C) 1986, 1989, 1991, 1992, 1995, 1996, 1998, 1999, 2000, 2002,
+ 2003, 2004, 2005, 2007, 2008, 2009 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
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
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. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
-#include "symtab.h"
-#include "opcode/vax.h"
-#include "gdbcore.h"
+#include "arch-utils.h"
+#include "dis-asm.h"
+#include "floatformat.h"
#include "frame.h"
+#include "frame-base.h"
+#include "frame-unwind.h"
+#include "gdbcore.h"
+#include "gdbtypes.h"
+#include "osabi.h"
+#include "regcache.h"
+#include "regset.h"
+#include "trad-frame.h"
#include "value.h"
-/* Return 1 if P points to an invalid floating point value.
- LEN is the length in bytes -- not relevant on the Vax. */
-
-/* FIXME: cagney/2002-01-19: The macro below was originally defined in
- tm-vax.h and used in values.c. Two problems. Firstly this is a
- very non-portable and secondly it is wrong. The VAX should be
- using floatformat and associated methods to identify and handle
- invalid floating-point values. Adding to the poor target's woes
- there is no floatformat_vax_{f,d} and no TARGET_FLOAT_FORMAT
- et.al.. */
+#include "gdb_string.h"
-/* FIXME: cagney/2002-01-19: It turns out that the only thing that
- uses this macro is the vax disassembler code (so how old is this
- target?). This target should instead be using the opcodes
- disassembler. That allowing the macro to be eliminated. */
+#include "vax-tdep.h"
-#define INVALID_FLOAT(p, len) ((*(short *) p & 0xff80) == 0x8000)
+/* Return the name of register REGNUM. */
-/* 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 ();
-\f
-char *
-vax_register_name (int regno)
+static const char *
+vax_register_name (struct gdbarch *gdbarch, int regnum)
{
static char *register_names[] =
{
- "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
- "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc",
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc",
"ps",
};
- if (regno < 0)
- return (NULL);
- if (regno >= (sizeof(register_names) / sizeof(*register_names)))
- return (NULL);
- return (register_names[regno]);
+ if (regnum >= 0 && regnum < ARRAY_SIZE (register_names))
+ return register_names[regnum];
+
+ return NULL;
}
-int
-vax_register_byte (int regno)
+/* Return the GDB type object for the "standard" data type of data in
+ register REGNUM. */
+
+static struct type *
+vax_register_type (struct gdbarch *gdbarch, int regnum)
{
- return (regno * 4);
+ return builtin_type (gdbarch)->builtin_int;
}
+\f
+/* Core file support. */
-int
-vax_register_raw_size (int regno)
+/* Supply register REGNUM from the buffer specified by GREGS and LEN
+ in the general-purpose register set REGSET to register cache
+ REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
+
+static void
+vax_supply_gregset (const struct regset *regset, struct regcache *regcache,
+ int regnum, const void *gregs, size_t len)
{
- return (4);
+ const gdb_byte *regs = gregs;
+ int i;
+
+ for (i = 0; i < VAX_NUM_REGS; i++)
+ {
+ if (regnum == i || regnum == -1)
+ regcache_raw_supply (regcache, i, regs + i * 4);
+ }
}
-int
-vax_register_virtual_size (int regno)
+/* VAX register set. */
+
+static struct regset vax_gregset =
{
- return (4);
-}
+ NULL,
+ vax_supply_gregset
+};
+
+/* Return the appropriate register set for the core section identified
+ by SECT_NAME and SECT_SIZE. */
-struct type *
-vax_register_virtual_type (int regno)
+static const struct regset *
+vax_regset_from_core_section (struct gdbarch *gdbarch,
+ const char *sect_name, size_t sect_size)
{
- return (builtin_type_int);
+ if (strcmp (sect_name, ".reg") == 0 && sect_size >= VAX_NUM_REGS * 4)
+ return &vax_gregset;
+
+ return NULL;
}
\f
-void
-vax_frame_init_saved_regs (struct frame_info *frame)
-{
- int regnum, regmask;
- CORE_ADDR next_addr;
-
- if (frame->saved_regs)
- return;
-
- frame_saved_regs_zalloc (frame);
+/* The VAX UNIX calling convention uses R1 to pass a structure return
+ value address instead of passing it as a first (hidden) argument as
+ the VMS calling convention suggests. */
- regmask = read_memory_integer (frame->frame + 4, 4) >> 16;
+static CORE_ADDR
+vax_store_arguments (struct regcache *regcache, int nargs,
+ struct value **args, CORE_ADDR sp)
+{
+ gdb_byte buf[4];
+ int count = 0;
+ int i;
- next_addr = frame->frame + 16;
+ /* We create an argument list on the stack, and make the argument
+ pointer to it. */
- /* regmask's low bit is for register 0, which is the first one
- what would be pushed. */
- for (regnum = 0; regnum < AP_REGNUM; regnum++)
+ /* Push arguments in reverse order. */
+ for (i = nargs - 1; i >= 0; i--)
{
- if (regmask & (1 << regnum))
- frame->saved_regs[regnum] = next_addr += 4;
+ int len = TYPE_LENGTH (value_enclosing_type (args[i]));
+
+ sp -= (len + 3) & ~3;
+ count += (len + 3) / 4;
+ write_memory (sp, value_contents_all (args[i]), len);
}
- frame->saved_regs[SP_REGNUM] = next_addr + 4;
- if (regmask & (1 << FP_REGNUM))
- frame->saved_regs[SP_REGNUM] +=
- 4 + (4 * read_memory_integer (next_addr + 4, 4));
+ /* Push argument count. */
+ sp -= 4;
+ store_unsigned_integer (buf, 4, count);
+ write_memory (sp, buf, 4);
- frame->saved_regs[PC_REGNUM] = frame->frame + 16;
- frame->saved_regs[FP_REGNUM] = frame->frame + 12;
- frame->saved_regs[AP_REGNUM] = frame->frame + 8;
- frame->saved_regs[PS_REGNUM] = frame->frame + 4;
-}
+ /* Update the argument pointer. */
+ store_unsigned_integer (buf, 4, sp);
+ regcache_cooked_write (regcache, VAX_AP_REGNUM, buf);
-CORE_ADDR
-vax_frame_saved_pc (struct frame_info *frame)
-{
- if (frame->signal_handler_caller)
- return (sigtramp_saved_pc (frame)); /* XXXJRT */
-
- return (read_memory_integer (frame->frame + 16, 4));
+ return sp;
}
-CORE_ADDR
-vax_frame_args_address_correct (struct frame_info *frame)
+static CORE_ADDR
+vax_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
+ struct regcache *regcache, CORE_ADDR bp_addr, int nargs,
+ struct value **args, CORE_ADDR sp, int struct_return,
+ CORE_ADDR struct_addr)
{
- /* Cannot find the AP register value directly from the FP value. Must
- find it saved in the frame called by this one, or in the AP register
- for the innermost frame. However, there is no way to tell the
- difference between the innermost frame and a frame for which we
- just don't know the frame that it called (e.g. "info frame 0x7ffec789").
- For the sake of argument, suppose that the stack is somewhat trashed
- (which is one reason that "info frame" exists). So, return 0 (indicating
- we don't know the address of the arglist) if we don't know what frame
- this frame calls. */
- if (frame->next)
- return (read_memory_integer (frame->next->frame + 8, 4));
-
- return (0);
+ CORE_ADDR fp = sp;
+ gdb_byte buf[4];
+
+ /* Set up the function arguments. */
+ sp = vax_store_arguments (regcache, nargs, args, sp);
+
+ /* Store return value address. */
+ if (struct_return)
+ regcache_cooked_write_unsigned (regcache, VAX_R1_REGNUM, struct_addr);
+
+ /* Store return address in the PC slot. */
+ sp -= 4;
+ store_unsigned_integer (buf, 4, bp_addr);
+ write_memory (sp, buf, 4);
+
+ /* Store the (fake) frame pointer in the FP slot. */
+ sp -= 4;
+ store_unsigned_integer (buf, 4, fp);
+ write_memory (sp, buf, 4);
+
+ /* Skip the AP slot. */
+ sp -= 4;
+
+ /* Store register save mask and control bits. */
+ sp -= 4;
+ store_unsigned_integer (buf, 4, 0);
+ write_memory (sp, buf, 4);
+
+ /* Store condition handler. */
+ sp -= 4;
+ store_unsigned_integer (buf, 4, 0);
+ write_memory (sp, buf, 4);
+
+ /* Update the stack pointer and frame pointer. */
+ store_unsigned_integer (buf, 4, sp);
+ regcache_cooked_write (regcache, VAX_SP_REGNUM, buf);
+ regcache_cooked_write (regcache, VAX_FP_REGNUM, buf);
+
+ /* Return the saved (fake) frame pointer. */
+ return fp;
}
-CORE_ADDR
-vax_frame_args_address (struct frame_info *frame)
+static struct frame_id
+vax_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
{
- /* In most of GDB, getting the args address is too important to
- just say "I don't know". This is sometimes wrong for functions
- that aren't on top of the stack, but c'est la vie. */
- if (frame->next)
- return (read_memory_integer (frame->next->frame + 8, 4));
+ CORE_ADDR fp;
- return (read_register (AP_REGNUM));
+ fp = get_frame_register_unsigned (this_frame, VAX_FP_REGNUM);
+ return frame_id_build (fp, get_frame_pc (this_frame));
}
+\f
-CORE_ADDR
-vax_frame_locals_address (struct frame_info *frame)
+static enum return_value_convention
+vax_return_value (struct gdbarch *gdbarch, struct type *func_type,
+ struct type *type, struct regcache *regcache,
+ gdb_byte *readbuf, const gdb_byte *writebuf)
{
- return (frame->frame);
-}
+ int len = TYPE_LENGTH (type);
+ gdb_byte buf[8];
-int
-vax_frame_num_args (struct frame_info *fi)
-{
- return (0xff & read_memory_integer (FRAME_ARGS_ADDRESS (fi), 1));
-}
-\f
-void
-vax_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
-{
- write_register (1, addr);
-}
+ if (TYPE_CODE (type) == TYPE_CODE_STRUCT
+ || TYPE_CODE (type) == TYPE_CODE_UNION
+ || TYPE_CODE (type) == TYPE_CODE_ARRAY)
+ {
+ /* The default on VAX is to return structures in static memory.
+ Consequently a function must return the address where we can
+ find the return value. */
-void
-vax_extract_return_value (struct type *valtype, char *regbuf, char *valbuf)
-{
- memcpy (valbuf, regbuf + REGISTER_BYTE (0), TYPE_LENGTH (valtype));
-}
+ if (readbuf)
+ {
+ ULONGEST addr;
-void
-vax_store_return_value (struct type *valtype, char *valbuf)
-{
- write_register_bytes (0, valbuf, TYPE_LENGTH (valtype));
+ regcache_raw_read_unsigned (regcache, VAX_R0_REGNUM, &addr);
+ read_memory (addr, readbuf, len);
+ }
+
+ return RETURN_VALUE_ABI_RETURNS_ADDRESS;
+ }
+
+ if (readbuf)
+ {
+ /* Read the contents of R0 and (if necessary) R1. */
+ regcache_cooked_read (regcache, VAX_R0_REGNUM, buf);
+ if (len > 4)
+ regcache_cooked_read (regcache, VAX_R1_REGNUM, buf + 4);
+ memcpy (readbuf, buf, len);
+ }
+ if (writebuf)
+ {
+ /* Read the contents to R0 and (if necessary) R1. */
+ memcpy (buf, writebuf, len);
+ regcache_cooked_write (regcache, VAX_R0_REGNUM, buf);
+ if (len > 4)
+ regcache_cooked_write (regcache, VAX_R1_REGNUM, buf + 4);
+ }
+
+ return RETURN_VALUE_REGISTER_CONVENTION;
}
+\f
-CORE_ADDR
-vax_extract_struct_value_address (char *regbuf)
+/* Use the program counter to determine the contents and size of a
+ breakpoint instruction. Return a pointer to a string of bytes that
+ encode a breakpoint instruction, store the length of the string in
+ *LEN and optionally adjust *PC to point to the correct memory
+ location for inserting the breakpoint. */
+
+static const gdb_byte *
+vax_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pc, int *len)
{
- return (extract_address (regbuf + REGISTER_BYTE (0), REGISTER_RAW_SIZE (0)));
+ static gdb_byte break_insn[] = { 3 };
+
+ *len = sizeof (break_insn);
+ return break_insn;
}
\f
/* Advance PC across any function entry prologue instructions
to reach some "real" code. */
-CORE_ADDR
-vax_skip_prologue (CORE_ADDR pc)
+static CORE_ADDR
+vax_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
{
- register int op = (unsigned char) read_memory_integer (pc, 1);
+ gdb_byte op = read_memory_unsigned_integer (pc, 1);
+
if (op == 0x11)
pc += 2; /* skip brb */
if (op == 0x31)
pc += 3; /* skip brw */
if (op == 0xC2
- && ((unsigned char) read_memory_integer (pc + 2, 1)) == 0x5E)
+ && (read_memory_unsigned_integer (pc + 2, 1)) == 0x5E)
pc += 3; /* skip subl2 */
if (op == 0x9E
- && ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xAE
- && ((unsigned char) read_memory_integer (pc + 3, 1)) == 0x5E)
+ && (read_memory_unsigned_integer (pc + 1, 1)) == 0xAE
+ && (read_memory_unsigned_integer (pc + 3, 1)) == 0x5E)
pc += 4; /* skip movab */
if (op == 0x9E
- && ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xCE
- && ((unsigned char) read_memory_integer (pc + 4, 1)) == 0x5E)
+ && (read_memory_unsigned_integer (pc + 1, 1)) == 0xCE
+ && (read_memory_unsigned_integer (pc + 4, 1)) == 0x5E)
pc += 5; /* skip movab */
if (op == 0x9E
- && ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xEE
- && ((unsigned char) read_memory_integer (pc + 6, 1)) == 0x5E)
+ && (read_memory_unsigned_integer (pc + 1, 1)) == 0xEE
+ && (read_memory_unsigned_integer (pc + 6, 1)) == 0x5E)
pc += 7; /* skip movab */
+
return pc;
}
+\f
+/* Unwinding the stack is relatively easy since the VAX has a
+ dedicated frame pointer, and frames are set up automatically as the
+ result of a function call. Most of the relevant information can be
+ inferred from the documentation of the Procedure Call Instructions
+ in the VAX MACRO and Instruction Set Reference Manual. */
-/* 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 (CORE_ADDR memaddr, disassemble_info *info)
+struct vax_frame_cache
{
- unsigned char buffer[MAXLEN];
- register int i;
- register unsigned char *p;
- const char *d;
+ /* Base address. */
+ CORE_ADDR base;
+
+ /* Table of saved registers. */
+ struct trad_frame_saved_reg *saved_regs;
+};
- int status = (*info->read_memory_func) (memaddr, buffer, MAXLEN, info);
- if (status != 0)
+static struct vax_frame_cache *
+vax_frame_cache (struct frame_info *this_frame, void **this_cache)
+{
+ struct vax_frame_cache *cache;
+ CORE_ADDR addr;
+ ULONGEST mask;
+ int regnum;
+
+ if (*this_cache)
+ return *this_cache;
+
+ /* Allocate a new cache. */
+ cache = FRAME_OBSTACK_ZALLOC (struct vax_frame_cache);
+ cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
+
+ /* The frame pointer is used as the base for the frame. */
+ cache->base = get_frame_register_unsigned (this_frame, VAX_FP_REGNUM);
+ if (cache->base == 0)
+ return cache;
+
+ /* The register save mask and control bits determine the layout of
+ the stack frame. */
+ mask = get_frame_memory_unsigned (this_frame, cache->base + 4, 4) >> 16;
+
+ /* These are always saved. */
+ cache->saved_regs[VAX_PC_REGNUM].addr = cache->base + 16;
+ cache->saved_regs[VAX_FP_REGNUM].addr = cache->base + 12;
+ cache->saved_regs[VAX_AP_REGNUM].addr = cache->base + 8;
+ cache->saved_regs[VAX_PS_REGNUM].addr = cache->base + 4;
+
+ /* Scan the register save mask and record the location of the saved
+ registers. */
+ addr = cache->base + 20;
+ for (regnum = 0; regnum < VAX_AP_REGNUM; regnum++)
{
- (*info->memory_error_func) (status, memaddr, info);
- return -1;
+ if (mask & (1 << regnum))
+ {
+ cache->saved_regs[regnum].addr = addr;
+ addr += 4;
+ }
}
- 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)
+ /* The CALLS/CALLG flag determines whether this frame has a General
+ Argument List or a Stack Argument List. */
+ if (mask & (1 << 13))
{
- (*info->fprintf_func) (info->stream, "0%o", buffer[0]);
- return 1;
+ ULONGEST numarg;
+
+ /* This is a procedure with Stack Argument List. Adjust the
+ stack address for the arguments that were pushed onto the
+ stack. The return instruction will automatically pop the
+ arguments from the stack. */
+ numarg = get_frame_memory_unsigned (this_frame, addr, 1);
+ addr += 4 + numarg * 4;
}
- (*info->fprintf_func) (info->stream, "%s", votstrs[i].name);
+ /* Bits 1:0 of the stack pointer were saved in the control bits. */
+ trad_frame_set_value (cache->saved_regs, VAX_SP_REGNUM, addr + (mask >> 14));
- /* 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;
+ return cache;
+}
- if (*d)
- (*info->fprintf_func) (info->stream, " ");
+static void
+vax_frame_this_id (struct frame_info *this_frame, void **this_cache,
+ struct frame_id *this_id)
+{
+ struct vax_frame_cache *cache = vax_frame_cache (this_frame, this_cache);
- while (*d)
- {
- p = print_insn_arg (d, p, memaddr + (p - buffer), info);
- d += 2;
- if (*d)
- (*info->fprintf_func) (info->stream, ",");
- }
- return p - buffer;
+ /* This marks the outermost frame. */
+ if (cache->base == 0)
+ return;
+
+ (*this_id) = frame_id_build (cache->base, get_frame_func (this_frame));
}
-static unsigned char *
-print_insn_arg (char *d, register char *p, CORE_ADDR addr,
- disassemble_info *info)
+static struct value *
+vax_frame_prev_register (struct frame_info *this_frame,
+ void **this_cache, int regnum)
{
- register int regnum = *p & 0xf;
- float floatlitbuf;
+ struct vax_frame_cache *cache = vax_frame_cache (this_frame, this_cache);
- 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;
+ return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
+}
+
+static const struct frame_unwind vax_frame_unwind =
+{
+ NORMAL_FRAME,
+ vax_frame_this_id,
+ vax_frame_prev_register,
+ NULL,
+ default_frame_sniffer
+};
+\f
+
+static CORE_ADDR
+vax_frame_base_address (struct frame_info *this_frame, void **this_cache)
+{
+ struct vax_frame_cache *cache = vax_frame_cache (this_frame, this_cache);
+
+ return cache->base;
+}
+
+static CORE_ADDR
+vax_frame_args_address (struct frame_info *this_frame, void **this_cache)
+{
+ return get_frame_register_unsigned (this_frame, VAX_AP_REGNUM);
+}
+
+static const struct frame_base vax_frame_base =
+{
+ &vax_frame_unwind,
+ vax_frame_base_address,
+ vax_frame_base_address,
+ vax_frame_args_address
+};
+
+/* Return number of arguments for FRAME. */
+
+static int
+vax_frame_num_args (struct frame_info *frame)
+{
+ CORE_ADDR args;
+
+ /* Assume that the argument pointer for the outermost frame is
+ hosed, as is the case on NetBSD/vax ELF. */
+ if (get_frame_base_address (frame) == 0)
+ return 0;
+
+ args = get_frame_register_unsigned (frame, VAX_AP_REGNUM);
+ return get_frame_memory_unsigned (frame, args, 1);
+}
+
+static CORE_ADDR
+vax_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ return frame_unwind_register_unsigned (next_frame, VAX_PC_REGNUM);
+}
+\f
+
+/* Initialize the current architecture based on INFO. If possible, re-use an
+ architecture from ARCHES, which is a list of architectures already created
+ during this debugging session.
+
+ Called e.g. at program startup, when reading a core file, and when reading
+ a binary file. */
+
+static struct gdbarch *
+vax_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
+{
+ struct gdbarch *gdbarch;
+
+ /* If there is already a candidate, use it. */
+ arches = gdbarch_list_lookup_by_info (arches, &info);
+ if (arches != NULL)
+ return arches->gdbarch;
+
+ gdbarch = gdbarch_alloc (&info, NULL);
+
+ set_gdbarch_float_format (gdbarch, floatformats_vax_f);
+ set_gdbarch_double_format (gdbarch, floatformats_vax_d);
+ set_gdbarch_long_double_format (gdbarch, floatformats_vax_d);
+ set_gdbarch_long_double_bit (gdbarch, 64);
+
+ /* Register info */
+ set_gdbarch_num_regs (gdbarch, VAX_NUM_REGS);
+ set_gdbarch_register_name (gdbarch, vax_register_name);
+ set_gdbarch_register_type (gdbarch, vax_register_type);
+ set_gdbarch_sp_regnum (gdbarch, VAX_SP_REGNUM);
+ set_gdbarch_pc_regnum (gdbarch, VAX_PC_REGNUM);
+ set_gdbarch_ps_regnum (gdbarch, VAX_PS_REGNUM);
+
+ set_gdbarch_regset_from_core_section
+ (gdbarch, vax_regset_from_core_section);
+
+ /* Frame and stack info */
+ set_gdbarch_skip_prologue (gdbarch, vax_skip_prologue);
+ set_gdbarch_frame_num_args (gdbarch, vax_frame_num_args);
+ set_gdbarch_frame_args_skip (gdbarch, 4);
+
+ /* Stack grows downward. */
+ set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
+
+ /* Return value info */
+ set_gdbarch_return_value (gdbarch, vax_return_value);
+
+ /* Call dummy code. */
+ set_gdbarch_push_dummy_call (gdbarch, vax_push_dummy_call);
+ set_gdbarch_dummy_id (gdbarch, vax_dummy_id);
+
+ /* Breakpoint info */
+ set_gdbarch_breakpoint_from_pc (gdbarch, vax_breakpoint_from_pc);
+
+ /* Misc info */
+ set_gdbarch_deprecated_function_start_offset (gdbarch, 2);
+ set_gdbarch_believe_pcc_promotion (gdbarch, 1);
+
+ set_gdbarch_print_insn (gdbarch, print_insn_vax);
+
+ set_gdbarch_unwind_pc (gdbarch, vax_unwind_pc);
+
+ frame_base_set_default (gdbarch, &vax_frame_base);
+
+ /* Hook in ABI-specific overrides, if they have been registered. */
+ gdbarch_init_osabi (info, gdbarch);
+
+ frame_unwind_append_unwinder (gdbarch, &vax_frame_unwind);
+
+ return (gdbarch);
}
+/* Provide a prototype to silence -Wmissing-prototypes. */
+void _initialize_vax_tdep (void);
+
void
_initialize_vax_tdep (void)
{
- tm_print_insn = vax_print_insn;
+ gdbarch_register (bfd_arch_vax, vax_gdbarch_init, NULL);
}
projects / deliverable / binutils-gdb.git / blobdiff