-/* Intel 386 stuff.
- Copyright (C) 1988, 1989 Free Software Foundation, Inc.
+/* Intel 386 target-dependent stuff.
+ Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc.
This file is part of GDB.
-GDB is free software; you can redistribute it and/or modify
+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 1, or (at your option)
-any later version.
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
-GDB is distributed in the hope that it will be useful,
+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 GDB; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-#include <stdio.h>
#include "defs.h"
-#include "param.h"
#include "frame.h"
#include "inferior.h"
#include "gdbcore.h"
-#ifdef USG
-#include <sys/types.h>
+#ifdef USE_PROC_FS /* Target dependent support for /proc */
+#include <sys/procfs.h>
#endif
-#include <sys/param.h>
-#include <sys/dir.h>
-#include <signal.h>
-#include <sys/user.h>
-#include <sys/ioctl.h>
-#include <fcntl.h>
-
-#ifndef N_SET_MAGIC
-#ifdef COFF_FORMAT
-#define N_SET_MAGIC(exec, val) ((exec).magic = (val))
-#else
-#define N_SET_MAGIC(exec, val) ((exec).a_magic = (val))
-#endif
-#endif
+static long
+i386_get_frame_setup PARAMS ((int));
-#include <sys/file.h>
-#include <sys/stat.h>
+static void
+i386_follow_jump PARAMS ((void));
-/* I don't know whether this is right for cross-debugging even if you
- do somehow manage to get the right include file. */
-#if defined (USE_MACHINE_REG_H)
-#include <machine/reg.h>
-#else
-#include <sys/reg.h>
-#endif
+static void
+codestream_read PARAMS ((unsigned char *, int));
-/* helper functions for m-i386.h */
+static void
+codestream_seek PARAMS ((int));
-/* stdio style buffering to minimize calls to ptrace */
+static unsigned char
+codestream_fill PARAMS ((int));
+
+/* helper functions for tm-i386.h */
+
+/* Stdio style buffering was used to minimize calls to ptrace, but this
+ buffering did not take into account that the code section being accessed
+ may not be an even number of buffers long (even if the buffer is only
+ sizeof(int) long). In cases where the code section size happened to
+ be a non-integral number of buffers long, attempting to read the last
+ buffer would fail. Simply using target_read_memory and ignoring errors,
+ rather than read_memory, is not the correct solution, since legitimate
+ access errors would then be totally ignored. To properly handle this
+ situation and continue to use buffering would require that this code
+ be able to determine the minimum code section size granularity (not the
+ alignment of the section itself, since the actual failing case that
+ pointed out this problem had a section alignment of 4 but was not a
+ multiple of 4 bytes long), on a target by target basis, and then
+ adjust it's buffer size accordingly. This is messy, but potentially
+ feasible. It probably needs the bfd library's help and support. For
+ now, the buffer size is set to 1. (FIXME -fnf) */
+
+#define CODESTREAM_BUFSIZ 1 /* Was sizeof(int), see note above. */
static CORE_ADDR codestream_next_addr;
static CORE_ADDR codestream_addr;
-static unsigned char codestream_buf[sizeof (int)];
+static unsigned char codestream_buf[CODESTREAM_BUFSIZ];
static int codestream_off;
static int codestream_cnt;
static unsigned char
codestream_fill (peek_flag)
+ int peek_flag;
{
codestream_addr = codestream_next_addr;
- codestream_next_addr += sizeof (int);
+ codestream_next_addr += CODESTREAM_BUFSIZ;
codestream_off = 0;
- codestream_cnt = sizeof (int);
+ codestream_cnt = CODESTREAM_BUFSIZ;
read_memory (codestream_addr,
(unsigned char *)codestream_buf,
- sizeof (int));
+ CODESTREAM_BUFSIZ);
if (peek_flag)
return (codestream_peek());
static void
codestream_seek (place)
+ int place;
{
- codestream_next_addr = place & -sizeof (int);
+ codestream_next_addr = place / CODESTREAM_BUFSIZ;
+ codestream_next_addr *= CODESTREAM_BUFSIZ;
codestream_cnt = 0;
codestream_fill (1);
while (codestream_tell() != place)
static void
codestream_read (buf, count)
unsigned char *buf;
+ int count;
{
unsigned char *p;
int i;
}
/* next instruction is a jump, move to target */
-static
+
+static void
i386_follow_jump ()
{
int long_delta;
if (data16)
{
codestream_read ((unsigned char *)&short_delta, 2);
- pos += short_delta + 3; /* include size of jmp inst */
+
+ /* include size of jmp inst (including the 0x66 prefix). */
+ pos += short_delta + 4;
}
else
{
pos += byte_delta + 2;
break;
}
- codestream_seek (pos + data16);
+ codestream_seek (pos);
}
/*
* if entry sequence doesn't make sense, return -1, and leave
* codestream pointer random
*/
+
static long
i386_get_frame_setup (pc)
+ int pc;
{
unsigned char op;
}
/* subl with 32 bit immediate */
codestream_read ((unsigned char *)&locals, 4);
+ SWAP_TARGET_AND_HOST (&locals, 4);
return (locals);
}
else
/* enter instruction: arg is 16 bit unsigned immed */
unsigned short slocals;
codestream_read ((unsigned char *)&slocals, 2);
+ SWAP_TARGET_AND_HOST (&slocals, 2);
codestream_get (); /* flush final byte of enter instruction */
return (slocals);
}
int
i386_frame_num_args (fi)
- struct frame_info fi;
+ struct frame_info *fi;
{
int retpc;
unsigned char op;
nameless arguments. */
return -1;
- pfi = get_prev_frame_info ((fi));
+ pfi = get_prev_frame_info (fi);
if (pfi == 0)
{
/* Note: this can happen if we are looking at the frame for
* next instruction will be a branch back to the start.
*/
+void
i386_frame_find_saved_regs (fip, fsrp)
struct frame_info *fip;
struct frame_saved_regs *fsrp;
}
/* return pc of first real instruction */
+
+int
i386_skip_prologue (pc)
+ int pc;
{
unsigned char op;
int i;
return (codestream_tell ());
}
+void
i386_push_dummy_frame ()
{
CORE_ADDR sp = read_register (SP_REGNUM);
write_register (SP_REGNUM, sp);
}
+void
i386_pop_frame ()
{
FRAME frame = get_current_frame ();
set_current_frame ( create_new_frame (read_register (FP_REGNUM),
read_pc ()));
}
+
+#ifdef USE_PROC_FS /* Target dependent support for /proc */
+
+/* The /proc interface divides the target machine's register set up into
+ two different sets, the general register set (gregset) and the floating
+ point register set (fpregset). For each set, there is an ioctl to get
+ the current register set and another ioctl to set the current values.
+
+ The actual structure passed through the ioctl interface is, of course,
+ naturally machine dependent, and is different for each set of registers.
+ For the i386 for example, the general register set is typically defined
+ by:
+
+ typedef int gregset_t[19]; (in <sys/regset.h>)
+
+ #define GS 0 (in <sys/reg.h>)
+ #define FS 1
+ ...
+ #define UESP 17
+ #define SS 18
+
+ and the floating point set by:
+
+ typedef struct fpregset
+ {
+ union
+ {
+ struct fpchip_state // fp extension state //
+ {
+ int state[27]; // 287/387 saved state //
+ int status; // status word saved at exception //
+ } fpchip_state;
+ struct fp_emul_space // for emulators //
+ {
+ char fp_emul[246];
+ char fp_epad[2];
+ } fp_emul_space;
+ int f_fpregs[62]; // union of the above //
+ } fp_reg_set;
+ long f_wregs[33]; // saved weitek state //
+ } fpregset_t;
+
+ These routines provide the packing and unpacking of gregset_t and
+ fpregset_t formatted data.
+
+ */
+
+/* This is a duplicate of the table in i386-xdep.c. */
+
+static int regmap[] =
+{
+ EAX, ECX, EDX, EBX,
+ UESP, EBP, ESI, EDI,
+ EIP, EFL, CS, SS,
+ DS, ES, FS, GS,
+};
+
+
+/* Given a pointer to a general register set in /proc format (gregset_t *),
+ unpack the register contents and supply them as gdb's idea of the current
+ register values. */
+
+void
+supply_gregset (gregsetp)
+ gregset_t *gregsetp;
+{
+ register int regno;
+ register greg_t *regp = (greg_t *) gregsetp;
+ extern int regmap[];
+
+ for (regno = 0 ; regno < NUM_REGS ; regno++)
+ {
+ supply_register (regno, (char *) (regp + regmap[regno]));
+ }
+}
+
+void
+fill_gregset (gregsetp, regno)
+ gregset_t *gregsetp;
+ int regno;
+{
+ int regi;
+ register greg_t *regp = (greg_t *) gregsetp;
+ extern char registers[];
+ extern int regmap[];
+
+ for (regi = 0 ; regi < NUM_REGS ; regi++)
+ {
+ if ((regno == -1) || (regno == regi))
+ {
+ *(regp + regmap[regno]) = *(int *) ®isters[REGISTER_BYTE (regi)];
+ }
+ }
+}
+
+#if defined (FP0_REGNUM)
+
+/* Given a pointer to a floating point register set in /proc format
+ (fpregset_t *), unpack the register contents and supply them as gdb's
+ idea of the current floating point register values. */
+
+void
+supply_fpregset (fpregsetp)
+ fpregset_t *fpregsetp;
+{
+ register int regno;
+
+ /* FIXME: see m68k-tdep.c for an example, for the m68k. */
+}
+
+/* Given a pointer to a floating point register set in /proc format
+ (fpregset_t *), update the register specified by REGNO from gdb's idea
+ of the current floating point register set. If REGNO is -1, update
+ them all. */
+
+void
+fill_fpregset (fpregsetp, regno)
+ fpregset_t *fpregsetp;
+ int regno;
+{
+ int regi;
+ char *to;
+ char *from;
+ extern char registers[];
+
+ /* FIXME: see m68k-tdep.c for an example, for the m68k. */
+}
+
+#endif /* defined (FP0_REGNUM) */
+
+#endif /* USE_PROC_FS */
projects / deliverable / binutils-gdb.git / blobdiff