1 /* BSD `setjmp' entry point to `sigsetjmp (..., 1)'. i386 version.
2 Copyright (C) 1994-2012 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
19 /* This just does a tail-call to `__sigsetjmp (ARG, 1)'.
20 We cannot do it in C because it must be a tail-call, so frame-unwinding
21 in setjmp doesn't clobber the state restored by longjmp. */
24 #include <jmpbuf-offsets.h>
27 #include <stap-probe.h>
29 #define PARMS LINKAGE /* no space for saved regs */
31 #define SIGMSK JMPBUF+PTR_SIZE
33 ENTRY (BP_SYM (setjmp))
34 /* Note that we have to use a non-exported symbol in the next
35 jump since otherwise gas will emit it as a jump through the
36 PLT which is what we cannot use here. */
39 movl JMPBUF(%esp), %eax
40 CHECK_BOUNDS_BOTH_WIDE (%eax, JMPBUF(%esp), $JB_SIZE)
43 movl %ebx, (JB_BX*4)(%eax)
44 movl %esi, (JB_SI*4)(%eax)
45 movl %edi, (JB_DI*4)(%eax)
46 leal JMPBUF(%esp), %ecx /* Save SP as it will be after we return. */
50 movl %ecx, (JB_SP*4)(%eax)
51 movl PCOFF(%esp), %ecx /* Save PC we are returning to now. */
52 LIBC_PROBE (setjmp, 3, 4@%eax, -4@$1, 4@%ecx)
56 movl %ecx, (JB_PC*4)(%eax)
57 LEAVE /* pop frame pointer to prepare for tail-call. */
58 movl %ebp, (JB_BP*4)(%eax) /* Save caller's frame pointer. */
60 /* Call __sigjmp_save. */
62 cfi_adjust_cfa_offset (4)
64 cfi_adjust_cfa_offset (4)
65 call BP_SYM (__sigjmp_save)
67 cfi_adjust_cfa_offset (-4)
69 cfi_adjust_cfa_offset (-4)