/* Intel 386 target-dependent stuff.
- Copyright (C) 1988, 1989, 1991, 1994 Free Software Foundation, Inc.
+ Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
+ 1998, 1999, 2000, 2001
+ Free Software Foundation, Inc.
-This file is part of GDB.
+ 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
-(at your option) any later version.
+ 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.
+ 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+ 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 "defs.h"
+#include "gdb_string.h"
#include "frame.h"
#include "inferior.h"
#include "gdbcore.h"
#include "target.h"
-<<<<<<< i386-tdep.c
#include "floatformat.h"
-||||||| 1.26
-=======
#include "symtab.h"
->>>>>>> 1.27
-
-static long
-i386_get_frame_setup PARAMS ((int));
-
-static void
-i386_follow_jump PARAMS ((void));
-
-static void
-codestream_read PARAMS ((unsigned char *, int));
-
-static void
-codestream_seek PARAMS ((int));
-
-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. */
+#include "gdbcmd.h"
+#include "command.h"
+#include "arch-utils.h"
+#include "regcache.h"
+
+/* i386_register_byte[i] is the offset into the register file of the
+ start of register number i. We initialize this from
+ i386_register_raw_size. */
+int i386_register_byte[MAX_NUM_REGS];
+
+/* i386_register_raw_size[i] is the number of bytes of storage in
+ GDB's register array occupied by register i. */
+int i386_register_raw_size[MAX_NUM_REGS] = {
+ 4, 4, 4, 4,
+ 4, 4, 4, 4,
+ 4, 4, 4, 4,
+ 4, 4, 4, 4,
+ 10, 10, 10, 10,
+ 10, 10, 10, 10,
+ 4, 4, 4, 4,
+ 4, 4, 4, 4,
+ 16, 16, 16, 16,
+ 16, 16, 16, 16,
+ 4
+};
+
+/* i386_register_virtual_size[i] is the size in bytes of the virtual
+ type of register i. */
+int i386_register_virtual_size[MAX_NUM_REGS];
+\f
+
+/* This is the variable that is set with "set disassembly-flavor", and
+ its legitimate values. */
+static const char att_flavor[] = "att";
+static const char intel_flavor[] = "intel";
+static const char *valid_flavors[] =
+{
+ att_flavor,
+ intel_flavor,
+ NULL
+};
+static const char *disassembly_flavor = att_flavor;
+
+/* This is used to keep the bfd arch_info in sync with the disassembly
+ flavor. */
+static void set_disassembly_flavor_sfunc (char *, int,
+ struct cmd_list_element *);
+static void set_disassembly_flavor (void);
+\f
+
+/* 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[CODESTREAM_BUFSIZ];
static int codestream_cnt;
#define codestream_tell() (codestream_addr + codestream_off)
-#define codestream_peek() (codestream_cnt == 0 ? \
- codestream_fill(1): codestream_buf[codestream_off])
-#define codestream_get() (codestream_cnt-- == 0 ? \
- codestream_fill(0) : codestream_buf[codestream_off++])
-
-static unsigned char
-codestream_fill (peek_flag)
- int peek_flag;
+#define codestream_peek() \
+ (codestream_cnt == 0 ? \
+ codestream_fill(1) : codestream_buf[codestream_off])
+#define codestream_get() \
+ (codestream_cnt-- == 0 ? \
+ codestream_fill(0) : codestream_buf[codestream_off++])
+
+static unsigned char
+codestream_fill (int peek_flag)
{
codestream_addr = codestream_next_addr;
codestream_next_addr += CODESTREAM_BUFSIZ;
codestream_off = 0;
codestream_cnt = CODESTREAM_BUFSIZ;
read_memory (codestream_addr, (char *) codestream_buf, CODESTREAM_BUFSIZ);
-
+
if (peek_flag)
- return (codestream_peek());
+ return (codestream_peek ());
else
- return (codestream_get());
+ return (codestream_get ());
}
static void
-codestream_seek (place)
- int place;
+codestream_seek (CORE_ADDR place)
{
codestream_next_addr = place / CODESTREAM_BUFSIZ;
codestream_next_addr *= CODESTREAM_BUFSIZ;
codestream_cnt = 0;
codestream_fill (1);
- while (codestream_tell() != place)
+ while (codestream_tell () != place)
codestream_get ();
}
static void
-codestream_read (buf, count)
- unsigned char *buf;
- int count;
+codestream_read (unsigned char *buf, int count)
{
unsigned char *p;
int i;
for (i = 0; i < count; i++)
*p++ = codestream_get ();
}
+\f
-/* next instruction is a jump, move to target */
+/* If the next instruction is a jump, move to its target. */
static void
-i386_follow_jump ()
+i386_follow_jump (void)
{
unsigned char buf[4];
long delta;
switch (codestream_get ())
{
case 0xe9:
- /* relative jump: if data16 == 0, disp32, else disp16 */
+ /* Relative jump: if data16 == 0, disp32, else disp16. */
if (data16)
{
codestream_read (buf, 2);
delta = extract_signed_integer (buf, 2);
- /* include size of jmp inst (including the 0x66 prefix). */
- pos += delta + 4;
+ /* Include the size of the jmp instruction (including the
+ 0x66 prefix). */
+ pos += delta + 4;
}
else
{
}
break;
case 0xeb:
- /* relative jump, disp8 (ignore data16) */
+ /* Relative jump, disp8 (ignore data16). */
codestream_read (buf, 1);
/* Sign-extend it. */
delta = extract_signed_integer (buf, 1);
codestream_seek (pos);
}
-/*
- * find & return amound a local space allocated, and advance codestream to
- * first register push (if any)
- *
- * if entry sequence doesn't make sense, return -1, and leave
- * codestream pointer random
- */
+/* Find & return the amount a local space allocated, and advance the
+ codestream to the first register push (if any).
+
+ If the entry sequence doesn't make sense, return -1, and leave
+ codestream pointer at a random spot. */
static long
-i386_get_frame_setup (pc)
- int pc;
+i386_get_frame_setup (CORE_ADDR pc)
{
unsigned char op;
if (op == 0x58) /* popl %eax */
{
- /*
- * this function must start with
- *
- * popl %eax 0x58
- * xchgl %eax, (%esp) 0x87 0x04 0x24
- * or xchgl %eax, 0(%esp) 0x87 0x44 0x24 0x00
- *
- * (the system 5 compiler puts out the second xchg
- * inst, and the assembler doesn't try to optimize it,
- * so the 'sib' form gets generated)
- *
- * this sequence is used to get the address of the return
- * buffer for a function that returns a structure
- */
+ /* This function must start with
+
+ popl %eax 0x58
+ xchgl %eax, (%esp) 0x87 0x04 0x24
+ or xchgl %eax, 0(%esp) 0x87 0x44 0x24 0x00
+
+ (the System V compiler puts out the second `xchg'
+ instruction, and the assembler doesn't try to optimize it, so
+ the 'sib' form gets generated). This sequence is used to get
+ the address of the return buffer for a function that returns
+ a structure. */
int pos;
unsigned char buf[4];
- static unsigned char proto1[3] = { 0x87,0x04,0x24 };
- static unsigned char proto2[4] = { 0x87,0x44,0x24,0x00 };
+ static unsigned char proto1[3] = { 0x87, 0x04, 0x24 };
+ static unsigned char proto2[4] = { 0x87, 0x44, 0x24, 0x00 };
+
pos = codestream_tell ();
codestream_read (buf, 4);
if (memcmp (buf, proto1, 3) == 0)
pos += 4;
codestream_seek (pos);
- op = codestream_get (); /* update next opcode */
+ op = codestream_get (); /* Update next opcode. */
+ }
+
+ if (op == 0x68 || op == 0x6a)
+ {
+ /* This function may start with
+
+ pushl constant
+ call _probe
+ addl $4, %esp
+
+ followed by
+
+ pushl %ebp
+
+ etc. */
+ int pos;
+ unsigned char buf[8];
+
+ /* Skip past the `pushl' instruction; it has either a one-byte
+ or a four-byte operand, depending on the opcode. */
+ pos = codestream_tell ();
+ if (op == 0x68)
+ pos += 4;
+ else
+ pos += 1;
+ codestream_seek (pos);
+
+ /* Read the following 8 bytes, which should be "call _probe" (6
+ bytes) followed by "addl $4,%esp" (2 bytes). */
+ codestream_read (buf, sizeof (buf));
+ if (buf[0] == 0xe8 && buf[6] == 0xc4 && buf[7] == 0x4)
+ pos += sizeof (buf);
+ codestream_seek (pos);
+ op = codestream_get (); /* Update next opcode. */
}
if (op == 0x55) /* pushl %ebp */
- {
- /* check for movl %esp, %ebp - can be written two ways */
+ {
+ /* Check for "movl %esp, %ebp" -- can be written in two ways. */
switch (codestream_get ())
{
case 0x8b:
if (codestream_get () != 0xec)
- return (-1);
+ return -1;
break;
case 0x89:
if (codestream_get () != 0xe5)
- return (-1);
+ return -1;
break;
default:
- return (-1);
+ return -1;
}
- /* check for stack adjustment
- *
- * subl $XXX, %esp
- *
- * note: you can't subtract a 16 bit immediate
- * from a 32 bit reg, so we don't have to worry
- * about a data16 prefix
- */
+ /* Check for stack adjustment
+
+ subl $XXX, %esp
+
+ NOTE: You can't subtract a 16 bit immediate from a 32 bit
+ reg, so we don't have to worry about a data16 prefix. */
op = codestream_peek ();
if (op == 0x83)
{
- /* subl with 8 bit immed */
+ /* `subl' with 8 bit immediate. */
codestream_get ();
if (codestream_get () != 0xec)
- /* Some instruction starting with 0x83 other than subl. */
+ /* Some instruction starting with 0x83 other than `subl'. */
{
codestream_seek (codestream_tell () - 2);
return 0;
}
- /* subl with signed byte immediate
- * (though it wouldn't make sense to be negative)
- */
- return (codestream_get());
+ /* `subl' with signed byte immediate (though it wouldn't
+ make sense to be negative). */
+ return (codestream_get ());
}
else if (op == 0x81)
{
char buf[4];
- /* Maybe it is subl with 32 bit immedediate. */
- codestream_get();
+ /* Maybe it is `subl' with a 32 bit immedediate. */
+ codestream_get ();
if (codestream_get () != 0xec)
- /* Some instruction starting with 0x81 other than subl. */
+ /* Some instruction starting with 0x81 other than `subl'. */
{
codestream_seek (codestream_tell () - 2);
return 0;
}
- /* It is subl with 32 bit immediate. */
- codestream_read ((unsigned char *)buf, 4);
+ /* It is `subl' with a 32 bit immediate. */
+ codestream_read ((unsigned char *) buf, 4);
return extract_signed_integer (buf, 4);
}
else
{
- return (0);
+ return 0;
}
}
else if (op == 0xc8)
{
char buf[2];
- /* enter instruction: arg is 16 bit unsigned immed */
- codestream_read ((unsigned char *)buf, 2);
- codestream_get (); /* flush final byte of enter instruction */
+ /* `enter' with 16 bit unsigned immediate. */
+ codestream_read ((unsigned char *) buf, 2);
+ codestream_get (); /* Flush final byte of enter instruction. */
return extract_unsigned_integer (buf, 2);
}
return (-1);
Can return -1, meaning no way to tell. */
int
-i386_frame_num_args (fi)
- struct frame_info *fi;
+i386_frame_num_args (struct frame_info *fi)
{
#if 1
return -1;
#else
/* This loses because not only might the compiler not be popping the
- args right after the function call, it might be popping args from both
- this call and a previous one, and we would say there are more args
- than there really are. */
+ args right after the function call, it might be popping args from
+ both this call and a previous one, and we would say there are
+ more args than there really are. */
- int retpc;
- unsigned char op;
+ int retpc;
+ unsigned char op;
struct frame_info *pfi;
- /* on the 386, the instruction following the call could be:
+ /* On the i386, the instruction following the call could be:
popl %ecx - one arg
addl $imm, %esp - imm/4 args; imm may be 8 or 32 bits
- anything else - zero args */
+ anything else - zero args. */
int frameless;
- FRAMELESS_FUNCTION_INVOCATION (fi, frameless);
+ frameless = FRAMELESS_FUNCTION_INVOCATION (fi);
if (frameless)
- /* In the absence of a frame pointer, GDB doesn't get correct values
- for nameless arguments. Return -1, so it doesn't print any
- nameless arguments. */
+ /* In the absence of a frame pointer, GDB doesn't get correct
+ values for nameless arguments. Return -1, so it doesn't print
+ any nameless arguments. */
return -1;
- pfi = get_prev_frame_info (fi);
+ pfi = get_prev_frame (fi);
if (pfi == 0)
{
- /* Note: this can happen if we are looking at the frame for
- main, because FRAME_CHAIN_VALID won't let us go into
- start. If we have debugging symbols, that's not really
- a big deal; it just means it will only show as many arguments
- to main as are declared. */
+ /* NOTE: This can happen if we are looking at the frame for
+ main, because FRAME_CHAIN_VALID won't let us go into start.
+ If we have debugging symbols, that's not really a big deal;
+ it just means it will only show as many arguments to main as
+ are declared. */
return -1;
}
else
{
- retpc = pfi->pc;
- op = read_memory_integer (retpc, 1);
- if (op == 0x59)
- /* pop %ecx */
- return 1;
+ retpc = pfi->pc;
+ op = read_memory_integer (retpc, 1);
+ if (op == 0x59) /* pop %ecx */
+ return 1;
else if (op == 0x83)
{
- op = read_memory_integer (retpc+1, 1);
- if (op == 0xc4)
- /* addl $<signed imm 8 bits>, %esp */
- return (read_memory_integer (retpc+2,1)&0xff)/4;
+ op = read_memory_integer (retpc + 1, 1);
+ if (op == 0xc4)
+ /* addl $<signed imm 8 bits>, %esp */
+ return (read_memory_integer (retpc + 2, 1) & 0xff) / 4;
else
return 0;
}
- else if (op == 0x81)
- { /* add with 32 bit immediate */
- op = read_memory_integer (retpc+1, 1);
- if (op == 0xc4)
- /* addl $<imm 32>, %esp */
- return read_memory_integer (retpc+2, 4) / 4;
+ else if (op == 0x81) /* `add' with 32 bit immediate. */
+ {
+ op = read_memory_integer (retpc + 1, 1);
+ if (op == 0xc4)
+ /* addl $<imm 32>, %esp */
+ return read_memory_integer (retpc + 2, 4) / 4;
else
return 0;
}
#endif
}
-/*
- * parse the first few instructions of the function to see
- * what registers were stored.
- *
- * We handle these cases:
- *
- * The startup sequence can be at the start of the function,
- * or the function can start with a branch to startup code at the end.
- *
- * %ebp can be set up with either the 'enter' instruction, or
- * 'pushl %ebp, movl %esp, %ebp' (enter is too slow to be useful,
- * but was once used in the sys5 compiler)
- *
- * Local space is allocated just below the saved %ebp by either the
- * 'enter' instruction, or by 'subl $<size>, %esp'. 'enter' has
- * a 16 bit unsigned argument for space to allocate, and the
- * 'addl' instruction could have either a signed byte, or
- * 32 bit immediate.
- *
- * Next, the registers used by this function are pushed. In
- * the sys5 compiler they will always be in the order: %edi, %esi, %ebx
- * (and sometimes a harmless bug causes it to also save but not restore %eax);
- * however, the code below is willing to see the pushes in any order,
- * and will handle up to 8 of them.
- *
- * If the setup sequence is at the end of the function, then the
- * next instruction will be a branch back to the start.
- */
+/* Parse the first few instructions the function to see what registers
+ were stored.
+
+ We handle these cases:
+
+ The startup sequence can be at the start of the function, or the
+ function can start with a branch to startup code at the end.
+
+ %ebp can be set up with either the 'enter' instruction, or "pushl
+ %ebp, movl %esp, %ebp" (`enter' is too slow to be useful, but was
+ once used in the System V compiler).
+
+ Local space is allocated just below the saved %ebp by either the
+ 'enter' instruction, or by "subl $<size>, %esp". 'enter' has a 16
+ bit unsigned argument for space to allocate, and the 'addl'
+ instruction could have either a signed byte, or 32 bit immediate.
+
+ Next, the registers used by this function are pushed. With the
+ System V compiler they will always be in the order: %edi, %esi,
+ %ebx (and sometimes a harmless bug causes it to also save but not
+ restore %eax); however, the code below is willing to see the pushes
+ in any order, and will handle up to 8 of them.
+
+ If the setup sequence is at the end of the function, then the 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;
+i386_frame_init_saved_regs (struct frame_info *fip)
{
- long locals;
+ long locals = -1;
unsigned char op;
CORE_ADDR dummy_bottom;
- CORE_ADDR adr;
+ CORE_ADDR addr;
+ CORE_ADDR pc;
int i;
-
- memset (fsrp, 0, sizeof *fsrp);
-
- /* if frame is the end of a dummy, compute where the
- * beginning would be
- */
+
+ if (fip->saved_regs)
+ return;
+
+ frame_saved_regs_zalloc (fip);
+
+ /* If the frame is the end of a dummy, compute where the beginning
+ would be. */
dummy_bottom = fip->frame - 4 - REGISTER_BYTES - CALL_DUMMY_LENGTH;
-
- /* check if the PC is in the stack, in a dummy frame */
- if (dummy_bottom <= fip->pc && fip->pc <= fip->frame)
+
+ /* Check if the PC points in the stack, in a dummy frame. */
+ if (dummy_bottom <= fip->pc && fip->pc <= fip->frame)
{
- /* all regs were saved by push_call_dummy () */
- adr = fip->frame;
- for (i = 0; i < NUM_REGS; i++)
+ /* All registers were saved by push_call_dummy. */
+ addr = fip->frame;
+ for (i = 0; i < NUM_REGS; i++)
{
- adr -= REGISTER_RAW_SIZE (i);
- fsrp->regs[i] = adr;
+ addr -= REGISTER_RAW_SIZE (i);
+ fip->saved_regs[i] = addr;
}
return;
}
-
- locals = i386_get_frame_setup (get_pc_function_start (fip->pc));
-
- if (locals >= 0)
+
+ pc = get_pc_function_start (fip->pc);
+ if (pc != 0)
+ locals = i386_get_frame_setup (pc);
+
+ if (locals >= 0)
{
- adr = fip->frame - 4 - locals;
- for (i = 0; i < 8; i++)
+ addr = fip->frame - 4 - locals;
+ for (i = 0; i < 8; i++)
{
op = codestream_get ();
if (op < 0x50 || op > 0x57)
break;
- fsrp->regs[op - 0x50] = adr;
- adr -= 4;
+#ifdef I386_REGNO_TO_SYMMETRY
+ /* Dynix uses different internal numbering. Ick. */
+ fip->saved_regs[I386_REGNO_TO_SYMMETRY (op - 0x50)] = addr;
+#else
+ fip->saved_regs[op - 0x50] = addr;
+#endif
+ addr -= 4;
}
}
-
- fsrp->regs[PC_REGNUM] = fip->frame + 4;
- fsrp->regs[FP_REGNUM] = fip->frame;
+
+ fip->saved_regs[PC_REGNUM] = fip->frame + 4;
+ fip->saved_regs[FP_REGNUM] = fip->frame;
}
-/* return pc of first real instruction */
+/* Return PC of first real instruction. */
int
-i386_skip_prologue (pc)
- int pc;
+i386_skip_prologue (int pc)
{
unsigned char op;
int i;
- static unsigned char pic_pat[6] = { 0xe8, 0, 0, 0, 0, /* call 0x0 */
- 0x5b, /* popl %ebx */
- };
+ static unsigned char pic_pat[6] =
+ { 0xe8, 0, 0, 0, 0, /* call 0x0 */
+ 0x5b, /* popl %ebx */
+ };
CORE_ADDR pos;
-
+
if (i386_get_frame_setup (pc) < 0)
return (pc);
-
- /* found valid frame setup - codestream now points to
- * start of push instructions for saving registers
- */
-
- /* skip over register saves */
+
+ /* Found valid frame setup -- codestream now points to start of push
+ instructions for saving registers. */
+
+ /* Skip over register saves. */
for (i = 0; i < 8; i++)
{
op = codestream_peek ();
- /* break if not pushl inst */
- if (op < 0x50 || op > 0x57)
+ /* Break if not `pushl' instrunction. */
+ if (op < 0x50 || op > 0x57)
break;
codestream_get ();
}
- /* The native cc on SVR4 in -K PIC mode inserts the following code to get
- the address of the global offset table (GOT) into register %ebx.
- call 0x0
- popl %ebx
- movl %ebx,x(%ebp) (optional)
- addl y,%ebx
+ /* The native cc on SVR4 in -K PIC mode inserts the following code
+ to get the address of the global offset table (GOT) into register
+ %ebx
+
+ call 0x0
+ popl %ebx
+ movl %ebx,x(%ebp) (optional)
+ addl y,%ebx
+
This code is with the rest of the prologue (at the end of the
function), so we have to skip it to get to the first real
instruction at the start of the function. */
-
+
pos = codestream_tell ();
for (i = 0; i < 6; i++)
{
op = codestream_get ();
- if (pic_pat [i] != op)
+ if (pic_pat[i] != op)
break;
}
if (i == 6)
long delta = 6;
op = codestream_get ();
- if (op == 0x89) /* movl %ebx, x(%ebp) */
+ if (op == 0x89) /* movl %ebx, x(%ebp) */
{
op = codestream_get ();
- if (op == 0x5d) /* one byte offset from %ebp */
+ if (op == 0x5d) /* One byte offset from %ebp. */
{
delta += 3;
codestream_read (buf, 1);
}
- else if (op == 0x9d) /* four byte offset from %ebp */
+ else if (op == 0x9d) /* Four byte offset from %ebp. */
{
delta += 6;
codestream_read (buf, 4);
}
- else /* unexpected instruction */
- delta = -1;
- op = codestream_get ();
+ else /* Unexpected instruction. */
+ delta = -1;
+ op = codestream_get ();
}
- /* addl y,%ebx */
- if (delta > 0 && op == 0x81 && codestream_get () == 0xc3)
+ /* addl y,%ebx */
+ if (delta > 0 && op == 0x81 && codestream_get () == 0xc3)
{
- pos += delta + 6;
+ pos += delta + 6;
}
}
codestream_seek (pos);
-
+
i386_follow_jump ();
-
+
return (codestream_tell ());
}
void
-i386_push_dummy_frame ()
+i386_push_dummy_frame (void)
{
CORE_ADDR sp = read_register (SP_REGNUM);
int regnum;
char regbuf[MAX_REGISTER_RAW_SIZE];
-
+
sp = push_word (sp, read_register (PC_REGNUM));
sp = push_word (sp, read_register (FP_REGNUM));
write_register (FP_REGNUM, sp);
write_register (SP_REGNUM, sp);
}
+/* Insert the (relative) function address into the call sequence
+ stored at DYMMY. */
+
+void
+i386_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs,
+ value_ptr *args, struct type *type, int gcc_p)
+{
+ int from, to, delta, loc;
+
+ loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH);
+ from = loc + 5;
+ to = (int)(fun);
+ delta = to - from;
+
+ *((char *)(dummy) + 1) = (delta & 0xff);
+ *((char *)(dummy) + 2) = ((delta >> 8) & 0xff);
+ *((char *)(dummy) + 3) = ((delta >> 16) & 0xff);
+ *((char *)(dummy) + 4) = ((delta >> 24) & 0xff);
+}
+
void
-i386_pop_frame ()
+i386_pop_frame (void)
{
- FRAME frame = get_current_frame ();
+ struct frame_info *frame = get_current_frame ();
CORE_ADDR fp;
int regnum;
- struct frame_saved_regs fsr;
- struct frame_info *fi;
char regbuf[MAX_REGISTER_RAW_SIZE];
-
- fi = get_frame_info (frame);
- fp = fi->frame;
- get_frame_saved_regs (fi, &fsr);
- for (regnum = 0; regnum < NUM_REGS; regnum++)
+
+ fp = FRAME_FP (frame);
+ i386_frame_init_saved_regs (frame);
+
+ for (regnum = 0; regnum < NUM_REGS; regnum++)
{
- CORE_ADDR adr;
- adr = fsr.regs[regnum];
- if (adr)
+ CORE_ADDR addr;
+ addr = frame->saved_regs[regnum];
+ if (addr)
{
- read_memory (adr, regbuf, REGISTER_RAW_SIZE (regnum));
+ read_memory (addr, regbuf, REGISTER_RAW_SIZE (regnum));
write_register_bytes (REGISTER_BYTE (regnum), regbuf,
REGISTER_RAW_SIZE (regnum));
}
write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));
write_register (SP_REGNUM, fp + 8);
flush_cached_frames ();
- set_current_frame ( create_new_frame (read_register (FP_REGNUM),
- read_pc ()));
}
+\f
#ifdef GET_LONGJMP_TARGET
-/* Figure out where the longjmp will land. Slurp the args out of the stack.
- We expect the first arg to be a pointer to the jmp_buf structure from which
- we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
- This routine returns true on success. */
+/* Figure out where the longjmp will land. Slurp the args out of the
+ stack. We expect the first arg to be a pointer to the jmp_buf
+ structure from which we extract the pc (JB_PC) that we will land
+ at. The pc is copied into PC. This routine returns true on
+ success. */
int
-get_longjmp_target(pc)
- CORE_ADDR *pc;
+get_longjmp_target (CORE_ADDR *pc)
{
char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
CORE_ADDR sp, jb_addr;
sp = read_register (SP_REGNUM);
- if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */
+ if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack. */
buf,
TARGET_PTR_BIT / TARGET_CHAR_BIT))
return 0;
}
#endif /* GET_LONGJMP_TARGET */
+\f
-#ifdef I386_AIX_TARGET
-/* On AIX, floating point values are returned in floating point registers. */
+CORE_ADDR
+i386_push_arguments (int nargs, value_ptr *args, CORE_ADDR sp,
+ int struct_return, CORE_ADDR struct_addr)
+{
+ sp = default_push_arguments (nargs, args, sp, struct_return, struct_addr);
+
+ if (struct_return)
+ {
+ char buf[4];
+
+ sp -= 4;
+ store_address (buf, 4, struct_addr);
+ write_memory (sp, buf, 4);
+ }
+
+ return sp;
+}
+
+void
+i386_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
+{
+ /* Do nothing. Everything was already done by i386_push_arguments. */
+}
+
+/* These registers are used for returning integers (and on some
+ targets also for returning `struct' and `union' values when their
+ size and alignment match an integer type). */
+#define LOW_RETURN_REGNUM 0 /* %eax */
+#define HIGH_RETURN_REGNUM 2 /* %edx */
+
+/* Extract from an array REGBUF containing the (raw) register state, a
+ function return value of TYPE, and copy that, in virtual format,
+ into VALBUF. */
void
-i386_extract_return_value(type, regbuf, valbuf)
- struct type *type;
- char regbuf[REGISTER_BYTES];
- char *valbuf;
+i386_extract_return_value (struct type *type, char *regbuf, char *valbuf)
{
- if (TYPE_CODE_FLT == TYPE_CODE(type))
+ int len = TYPE_LENGTH (type);
+
+ if (TYPE_CODE_FLT == TYPE_CODE (type))
{
- double d;
- /* 387 %st(0), gcc uses this */
- floatformat_to_double (&floatformat_i387_ext,
- ®buf[REGISTER_BYTE(FP0_REGNUM)],
- &d);
- store_floating (valbuf, TYPE_LENGTH (type), d);
+ if (NUM_FREGS == 0)
+ {
+ warning ("Cannot find floating-point return value.");
+ memset (valbuf, 0, len);
+ return;
+ }
+
+ /* Floating-point return values can be found in %st(0). */
+ if (len == TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT
+ && TARGET_LONG_DOUBLE_FORMAT == &floatformat_i387_ext)
+ {
+ /* Copy straight over, but take care of the padding. */
+ memcpy (valbuf, ®buf[REGISTER_BYTE (FP0_REGNUM)],
+ FPU_REG_RAW_SIZE);
+ memset (valbuf + FPU_REG_RAW_SIZE, 0, len - FPU_REG_RAW_SIZE);
+ }
+ else
+ {
+ /* Convert the extended floating-point number found in
+ %st(0) to the desired type. This is probably not exactly
+ how it would happen on the target itself, but it is the
+ best we can do. */
+ DOUBLEST val;
+ floatformat_to_doublest (&floatformat_i387_ext,
+ ®buf[REGISTER_BYTE (FP0_REGNUM)], &val);
+ store_floating (valbuf, TYPE_LENGTH (type), val);
+ }
}
else
- {
- memcpy (valbuf, regbuf, TYPE_LENGTH (type));
+ {
+ int low_size = REGISTER_RAW_SIZE (LOW_RETURN_REGNUM);
+ int high_size = REGISTER_RAW_SIZE (HIGH_RETURN_REGNUM);
+
+ if (len <= low_size)
+ memcpy (valbuf, ®buf[REGISTER_BYTE (LOW_RETURN_REGNUM)], len);
+ else if (len <= (low_size + high_size))
+ {
+ memcpy (valbuf,
+ ®buf[REGISTER_BYTE (LOW_RETURN_REGNUM)], low_size);
+ memcpy (valbuf + low_size,
+ ®buf[REGISTER_BYTE (HIGH_RETURN_REGNUM)], len - low_size);
+ }
+ else
+ internal_error (__FILE__, __LINE__,
+ "Cannot extract return value of %d bytes long.", len);
+ }
+}
+
+/* Write into the appropriate registers a function return value stored
+ in VALBUF of type TYPE, given in virtual format. */
+
+void
+i386_store_return_value (struct type *type, char *valbuf)
+{
+ int len = TYPE_LENGTH (type);
+
+ if (TYPE_CODE_FLT == TYPE_CODE (type))
+ {
+ if (NUM_FREGS == 0)
+ {
+ warning ("Cannot set floating-point return value.");
+ return;
+ }
+
+ /* Floating-point return values can be found in %st(0). */
+ if (len == TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT
+ && TARGET_LONG_DOUBLE_FORMAT == &floatformat_i387_ext)
+ {
+ /* Copy straight over. */
+ write_register_bytes (REGISTER_BYTE (FP0_REGNUM), valbuf,
+ FPU_REG_RAW_SIZE);
+ }
+ else
+ {
+ char buf[FPU_REG_RAW_SIZE];
+ DOUBLEST val;
+
+ /* Convert the value found in VALBUF to the extended
+ floating point format used by the FPU. This is probably
+ not exactly how it would happen on the target itself, but
+ it is the best we can do. */
+ val = extract_floating (valbuf, TYPE_LENGTH (type));
+ floatformat_from_doublest (&floatformat_i387_ext, &val, buf);
+ write_register_bytes (REGISTER_BYTE (FP0_REGNUM), buf,
+ FPU_REG_RAW_SIZE);
+ }
+ }
+ else
+ {
+ int low_size = REGISTER_RAW_SIZE (LOW_RETURN_REGNUM);
+ int high_size = REGISTER_RAW_SIZE (HIGH_RETURN_REGNUM);
+
+ if (len <= low_size)
+ write_register_bytes (REGISTER_BYTE (LOW_RETURN_REGNUM), valbuf, len);
+ else if (len <= (low_size + high_size))
+ {
+ write_register_bytes (REGISTER_BYTE (LOW_RETURN_REGNUM),
+ valbuf, low_size);
+ write_register_bytes (REGISTER_BYTE (HIGH_RETURN_REGNUM),
+ valbuf + low_size, len - low_size);
+ }
+ else
+ internal_error (__FILE__, __LINE__,
+ "Cannot store return value of %d bytes long.", len);
}
}
-#endif /* I386_AIX_TARGET */
+\f
+
+/* Convert data from raw format for register REGNUM in buffer FROM to
+ virtual format with type TYPE in buffer TO. In principle both
+ formats are identical except that the virtual format has two extra
+ bytes appended that aren't used. We set these to zero. */
+
+void
+i386_register_convert_to_virtual (int regnum, struct type *type,
+ char *from, char *to)
+{
+ /* Copy straight over, but take care of the padding. */
+ memcpy (to, from, FPU_REG_RAW_SIZE);
+ memset (to + FPU_REG_RAW_SIZE, 0, TYPE_LENGTH (type) - FPU_REG_RAW_SIZE);
+}
+
+/* Convert data from virtual format with type TYPE in buffer FROM to
+ raw format for register REGNUM in buffer TO. Simply omit the two
+ unused bytes. */
+
+void
+i386_register_convert_to_raw (struct type *type, int regnum,
+ char *from, char *to)
+{
+ memcpy (to, from, FPU_REG_RAW_SIZE);
+}
+\f
#ifdef I386V4_SIGTRAMP_SAVED_PC
-/* Get saved user PC for sigtramp from the pushed ucontext on the stack
- for all three variants of SVR4 sigtramps. */
+/* Get saved user PC for sigtramp from the pushed ucontext on the
+ stack for all three variants of SVR4 sigtramps. */
CORE_ADDR
-i386v4_sigtramp_saved_pc (frame)
- FRAME frame;
+i386v4_sigtramp_saved_pc (struct frame_info *frame)
{
CORE_ADDR saved_pc_offset = 4;
char *name = NULL;
- find_pc_partial_function (frame->pc, &name,
- (CORE_ADDR *)NULL,(CORE_ADDR *)NULL);
+ find_pc_partial_function (frame->pc, &name, NULL, NULL);
if (name)
{
if (STREQ (name, "_sigreturn"))
saved_pc_offset = 132 + 14 * 4;
- if (STREQ (name, "_sigacthandler"))
+ else if (STREQ (name, "_sigacthandler"))
saved_pc_offset = 80 + 14 * 4;
- if (STREQ (name, "sigvechandler"))
+ else if (STREQ (name, "sigvechandler"))
saved_pc_offset = 120 + 14 * 4;
}
return read_memory_integer (read_register (SP_REGNUM) + saved_pc_offset, 4);
}
#endif /* I386V4_SIGTRAMP_SAVED_PC */
+\f
+
+#ifdef STATIC_TRANSFORM_NAME
+/* SunPRO encodes the static variables. This is not related to C++
+ mangling, it is done for C too. */
+
+char *
+sunpro_static_transform_name (char *name)
+{
+ char *p;
+ if (IS_STATIC_TRANSFORM_NAME (name))
+ {
+ /* For file-local statics there will be a period, a bunch of
+ junk (the contents of which match a string given in the
+ N_OPT), a period and the name. For function-local statics
+ there will be a bunch of junk (which seems to change the
+ second character from 'A' to 'B'), a period, the name of the
+ function, and the name. So just skip everything before the
+ last period. */
+ p = strrchr (name, '.');
+ if (p != NULL)
+ name = p + 1;
+ }
+ return name;
+}
+#endif /* STATIC_TRANSFORM_NAME */
+\f
+
+/* Stuff for WIN32 PE style DLL's but is pretty generic really. */
+
+CORE_ADDR
+skip_trampoline_code (CORE_ADDR pc, char *name)
+{
+ if (pc && read_memory_unsigned_integer (pc, 2) == 0x25ff) /* jmp *(dest) */
+ {
+ unsigned long indirect = read_memory_unsigned_integer (pc + 2, 4);
+ struct minimal_symbol *indsym =
+ indirect ? lookup_minimal_symbol_by_pc (indirect) : 0;
+ char *symname = indsym ? SYMBOL_NAME (indsym) : 0;
+
+ if (symname)
+ {
+ if (strncmp (symname, "__imp_", 6) == 0
+ || strncmp (symname, "_imp_", 5) == 0)
+ return name ? 1 : read_memory_unsigned_integer (indirect, 4);
+ }
+ }
+ return 0; /* Not a trampoline. */
+}
+\f
+
+/* We have two flavours of disassembly. The machinery on this page
+ deals with switching between those. */
+
+static int
+gdb_print_insn_i386 (bfd_vma memaddr, disassemble_info *info)
+{
+ if (disassembly_flavor == att_flavor)
+ return print_insn_i386_att (memaddr, info);
+ else if (disassembly_flavor == intel_flavor)
+ return print_insn_i386_intel (memaddr, info);
+ /* Never reached -- disassembly_flavour is always either att_flavor
+ or intel_flavor. */
+ internal_error (__FILE__, __LINE__, "failed internal consistency check");
+}
+
+/* If the disassembly mode is intel, we have to also switch the bfd
+ mach_type. This function is run in the set disassembly_flavor
+ command, and does that. */
+
+static void
+set_disassembly_flavor_sfunc (char *args, int from_tty,
+ struct cmd_list_element *c)
+{
+ set_disassembly_flavor ();
+}
+
+static void
+set_disassembly_flavor (void)
+{
+ if (disassembly_flavor == att_flavor)
+ set_architecture_from_arch_mach (bfd_arch_i386, bfd_mach_i386_i386);
+ else if (disassembly_flavor == intel_flavor)
+ set_architecture_from_arch_mach (bfd_arch_i386,
+ bfd_mach_i386_i386_intel_syntax);
+}
+\f
+
+/* Provide a prototype to silence -Wmissing-prototypes. */
+void _initialize_i386_tdep (void);
+
+void
+_initialize_i386_tdep (void)
+{
+ /* Initialize the table saying where each register starts in the
+ register file. */
+ {
+ int i, offset;
+
+ offset = 0;
+ for (i = 0; i < MAX_NUM_REGS; i++)
+ {
+ i386_register_byte[i] = offset;
+ offset += i386_register_raw_size[i];
+ }
+ }
+
+ /* Initialize the table of virtual register sizes. */
+ {
+ int i;
+
+ for (i = 0; i < MAX_NUM_REGS; i++)
+ i386_register_virtual_size[i] = TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (i));
+ }
+
+ tm_print_insn = gdb_print_insn_i386;
+ tm_print_insn_info.mach = bfd_lookup_arch (bfd_arch_i386, 0)->mach;
+
+ /* Add the variable that controls the disassembly flavor. */
+ {
+ struct cmd_list_element *new_cmd;
+
+ new_cmd = add_set_enum_cmd ("disassembly-flavor", no_class,
+ valid_flavors,
+ &disassembly_flavor,
+ "\
+Set the disassembly flavor, the valid values are \"att\" and \"intel\", \
+and the default value is \"att\".",
+ &setlist);
+ new_cmd->function.sfunc = set_disassembly_flavor_sfunc;
+ add_show_from_set (new_cmd, &showlist);
+ }
+
+ /* Finally, initialize the disassembly flavor to the default given
+ in the disassembly_flavor variable. */
+ set_disassembly_flavor ();
+}
projects / deliverable / binutils-gdb.git / blobdiff