* config/i386/tm-i386v4.h (I386V4_SIGTRAMP_SAVED_PC, IN_SIGTRAMP,
FRAME_CHAIN, FRAMELESS_FUNCTION_INVOCATION, FRAME_SAVED_PC): Define to make backtracing through the various sigtramp handlers work. * i386-tdep.c (i386v4_sigtramp_saved_pc): New routine to fetch the saved pc from ucontext on the stack for SVR4 signal handling.
This commit is contained in:
Peter Schauer
parent
e08b9ad7a1
commit
28ee4b4289
@ -1,3 +1,12 @@
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Sun Feb 27 21:39:48 1994 Peter Schauer (pes@regent.e-technik.tu-muenchen.de)
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* config/i386/tm-i386v4.h (I386V4_SIGTRAMP_SAVED_PC, IN_SIGTRAMP,
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FRAME_CHAIN, FRAMELESS_FUNCTION_INVOCATION, FRAME_SAVED_PC):
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Define to make backtracing through the various sigtramp handlers
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work.
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* i386-tdep.c (i386v4_sigtramp_saved_pc): New routine to fetch
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the saved pc from ucontext on the stack for SVR4 signal handling.
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Fri Feb 25 09:41:11 1994 Jim Kingdon (kingdon@deneb.cygnus.com)
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* remote.c, remote-mon.c, remote-utils.c, remote-utils.h,
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144
gdb/i386-tdep.c
144
gdb/i386-tdep.c
@ -1,5 +1,5 @@
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/* Intel 386 target-dependent stuff.
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Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc.
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Copyright (C) 1988, 1989, 1991, 1994 Free Software Foundation, Inc.
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This file is part of GDB.
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@ -22,6 +22,7 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "inferior.h"
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#include "gdbcore.h"
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#include "target.h"
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#include "symtab.h"
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static long
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i386_get_frame_setup PARAMS ((int));
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@ -115,42 +116,48 @@ codestream_read (buf, count)
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static void
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i386_follow_jump ()
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{
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int long_delta;
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short short_delta;
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char byte_delta;
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unsigned char buf[4];
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long delta;
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int data16;
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int pos;
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CORE_ADDR pos;
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pos = codestream_tell ();
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data16 = 0;
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if (codestream_peek () == 0x66)
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{
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codestream_get ();
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data16 = 1;
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}
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switch (codestream_get ())
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{
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case 0xe9:
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/* relative jump: if data16 == 0, disp32, else disp16 */
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if (data16)
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{
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codestream_read ((unsigned char *)&short_delta, 2);
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codestream_read (buf, 2);
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delta = extract_signed_integer (buf, 2);
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/* include size of jmp inst (including the 0x66 prefix). */
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pos += short_delta + 4;
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pos += delta + 4;
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}
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else
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{
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codestream_read ((unsigned char *)&long_delta, 4);
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pos += long_delta + 5;
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codestream_read (buf, 4);
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delta = extract_signed_integer (buf, 4);
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pos += delta + 5;
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}
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break;
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case 0xeb:
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/* relative jump, disp8 (ignore data16) */
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codestream_read ((unsigned char *)&byte_delta, 1);
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pos += byte_delta + 2;
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codestream_read (buf, 1);
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/* Sign-extend it. */
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delta = extract_signed_integer (buf, 1);
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pos += delta + 2;
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break;
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}
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codestream_seek (pos);
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@ -169,13 +176,13 @@ i386_get_frame_setup (pc)
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int pc;
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{
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unsigned char op;
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codestream_seek (pc);
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i386_follow_jump ();
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op = codestream_get ();
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if (op == 0x58) /* popl %eax */
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{
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/*
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@ -202,11 +209,11 @@ i386_get_frame_setup (pc)
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pos += 3;
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else if (memcmp (buf, proto2, 4) == 0)
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pos += 4;
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codestream_seek (pos);
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op = codestream_get (); /* update next opcode */
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}
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if (op == 0x55) /* pushl %ebp */
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{
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/* check for movl %esp, %ebp - can be written two ways */
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@ -441,6 +448,10 @@ i386_skip_prologue (pc)
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{
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unsigned char op;
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int i;
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static unsigned char pic_pat[6] = { 0xe8, 0, 0, 0, 0, /* call 0x0 */
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0x5b, /* popl %ebx */
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};
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CORE_ADDR pos;
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if (i386_get_frame_setup (pc) < 0)
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return (pc);
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@ -458,6 +469,54 @@ i386_skip_prologue (pc)
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break;
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codestream_get ();
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}
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/* The native cc on SVR4 in -K PIC mode inserts the following code to get
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the address of the global offset table (GOT) into register %ebx.
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call 0x0
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popl %ebx
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movl %ebx,x(%ebp) (optional)
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addl y,%ebx
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This code is with the rest of the prologue (at the end of the
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function), so we have to skip it to get to the first real
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instruction at the start of the function. */
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pos = codestream_tell ();
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for (i = 0; i < 6; i++)
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{
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op = codestream_get ();
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if (pic_pat [i] != op)
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break;
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}
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if (i == 6)
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{
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unsigned char buf[4];
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long delta = 6;
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op = codestream_get ();
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if (op == 0x89) /* movl %ebx, x(%ebp) */
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{
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op = codestream_get ();
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if (op == 0x5d) /* one byte offset from %ebp */
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{
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delta += 3;
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codestream_read (buf, 1);
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}
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else if (op == 0x9d) /* four byte offset from %ebp */
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{
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delta += 6;
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codestream_read (buf, 4);
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}
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else /* unexpected instruction */
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delta = -1;
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op = codestream_get ();
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}
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/* addl y,%ebx */
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if (delta > 0 && op == 0x81 && codestream_get () == 0xc3)
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{
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pos += delta + 6;
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}
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}
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codestream_seek (pos);
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i386_follow_jump ();
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@ -565,21 +624,7 @@ i386_extract_return_value(type, regbuf, valbuf)
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ieee_extended_to_double (&ext_format_i387,
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®buf[REGISTER_BYTE(FP0_REGNUM)],
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&d);
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switch (TYPE_LENGTH(type))
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{
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case 4: /* float */
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{
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float f = (float) d;
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memcpy (valbuf, &f, 4);
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break;
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}
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case 8: /* double */
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memcpy (valbuf, &d, 8);
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break;
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default:
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error("Unknown floating point size");
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break;
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}
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store_floating (valbuf, TYPE_LENGTH (type), d);
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}
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else
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{
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@ -587,3 +632,32 @@ i386_extract_return_value(type, regbuf, valbuf)
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}
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}
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#endif /* I386_AIX_TARGET */
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#ifdef I386V4_SIGTRAMP_SAVED_PC
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/* Get saved user PC for sigtramp from the pushed ucontext on the stack
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for all three variants of SVR4 sigtramps. */
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CORE_ADDR
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i386v4_sigtramp_saved_pc (frame)
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FRAME frame;
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{
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CORE_ADDR saved_pc_offset = 4;
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char *name = NULL;
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find_pc_partial_function (frame->pc, &name,
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(CORE_ADDR *)NULL,(CORE_ADDR *)NULL);
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if (name)
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{
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if (STREQ (name, "_sigreturn"))
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saved_pc_offset = 132 + 14 * 4;
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if (STREQ (name, "_sigacthandler"))
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saved_pc_offset = 80 + 14 * 4;
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if (STREQ (name, "sigvechandler"))
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saved_pc_offset = 120 + 14 * 4;
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}
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if (frame->next)
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return read_memory_integer (frame->next->frame + saved_pc_offset, 4);
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return read_memory_integer (read_register (SP_REGNUM) + saved_pc_offset, 4);
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}
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#endif /* I386V4_SIGTRAMP_SAVED_PC */
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