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Implement for real. Note: this version is currently broken.

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We don't pass sigmask the way this routine expects because it
can't work.

(Logical change 1.290)
This commit is contained in:
mostang.com!davidm 2005-05-03 09:13:17 +00:00
parent 7a5549f2d8
commit 239ea4e7ea
1 changed files with 64 additions and 6 deletions
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70
src/x86/siglongjmp.S
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@ -1,10 +1,68 @@
/* Dummy implementation for now. Libunwind-based setjmp/longjmp
can't work on x86 until we take advantage of DWARF2 unwind info. */
/* libunwind - a platform-independent unwind library
Copyright (C) 2004 Hewlett-Packard Co
Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
This file is part of libunwind.
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
.globl _UI_siglongjmp_cont
.globl _UI_longjmp_cont
#define SIG_SETMASK 2
/* Stack layout at this point:
+------------+ <- original $esp (at time of setjmp() call)
| sigmask[1] |
+------------+
| sigmask[0] |
+------------+
*/
.type _UI_siglongjmp_cont, @function
_UI_siglongjmp_cont:
_UI_longjmp_cont:
#warning fix me
ret
.cfi_startproc
.cfi_register 8, 0 /* IP saved in EAX */
.cfi_def_cfa_offset 8
mov %esp, %ecx /* pass address of signal mask in 3rd sc arg */
push %eax /* save target IP */
.cfi_adjust_cfa_offset 4
.cfi_offset 8, -12
push %edx /* save return value */
.cfi_adjust_cfa_offset 4
push %ebx /* save %ebx (preserved) */
.cfi_adjust_cfa_offset 4
.cfi_offset 3, -20
mov $SIG_SETMASK, %ebx /* 1st syscall arg (how) */
xor %edx, %edx /* pass NULL as 3rd syscall arg (old maskp) */
int $0x80
pop %ebx /* restore %ebx */
.cfi_adjust_cfa_offset -4
.cfi_restore 3
pop %eax /* fetch return value */
.cfi_adjust_cfa_offset -4
pop %edx /* pop target IP */
.cfi_adjust_cfa_offset -4
.cfi_register 8, 2 /* saved IP is now n EDX */
lea 8(%esp), %esp /* pop sigmask */
.cfi_adjust_cfa_offset -4
jmp *%edx
.cfi_endproc
.size _UI_siglongjmp_cont, .-_UI_siglongjmp_cont