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LibC: Fix sigsetjmp and siglongjmp

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This commit is contained in:
Jean-Baptiste Boric 2021-08-14 00:32:19 +02:00 • committed by Andreas Kling
parent 6165811081
commit c972afbea6
4 changed files with 139 additions and 61 deletions
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77
Userland/Libraries/LibC/arch/i386/setjmp.S
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@ -4,34 +4,67 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <bits/sighow.h>
//
// /!\ Read setjmp.h before modifying this file!
//
.global setjmp
setjmp:
mov 4(%esp), %eax
mov %ebx, 0(%eax)
mov %esi, 4(%eax)
mov %edi, 8(%eax)
mov %ebp, 12(%eax)
lea 4(%esp), %ecx
mov %ecx, 16(%eax)
mov (%esp), %ecx
mov %ecx, 20(%eax)
mov 4(%esp), %ecx // Grab jmp_buf argument
xor %eax, %eax // Grab val argument (hardcoded to zero)
jmp .Lsigset_common
.global sigsetjmp
sigsetjmp:
mov 4(%esp), %ecx // Grab jmp_buf argument
mov 8(%esp), %eax // Grab val argument
.Lsigset_common:
mov %eax, 24(%ecx) // Store val into did_save_signal_mask
movl $0, 28(%ecx) // Clear saved_signal_mask
test %eax, %eax
jz .Lsaveregs
lea 28(%ecx), %eax // Set argument oldset
push %eax
push $0 // Set argument set
push $0 // Set argument how
call sigprocmask
add $12, %esp
.Lsaveregs:
mov (%esp), %edx // Grab return address
mov %ebx, (0 * 4)(%ecx) // Save registers
mov %esi, (1 * 4)(%ecx)
mov %edi, (2 * 4)(%ecx)
mov %ebp, (3 * 4)(%ecx)
mov %esp, (4 * 4)(%ecx)
mov %edx, (5 * 4)(%ecx)
xor %eax, %eax
ret
.global longjmp
longjmp:
mov 4(%esp), %edx
mov 8(%esp), %eax
mov 0(%edx), %ebx
mov 4(%edx), %esi
mov 8(%edx), %edi
mov 12(%edx), %ebp
mov 16(%edx), %ecx
mov %ecx, %esp
mov 20(%edx), %ecx
mov 4(%esp), %ecx // Grab jmp_buf argument
mov 8(%esp), %eax // Grab val argument
test %eax, %eax
jnz .nonzero
mov 1, %eax
.nonzero:
jmp *%ecx
jnz .Lnonzero
mov $1, %eax
.Lnonzero:
mov (0 * 4)(%ecx), %ebx // Restore registers
mov (1 * 4)(%ecx), %esi
mov (2 * 4)(%ecx), %edi
mov (3 * 4)(%ecx), %ebp
//
// Until this point, the stack is still from the caller.
//
mov (4 * 4)(%ecx), %esp
mov (5 * 4)(%ecx), %edx
mov %edx, (%esp) // Patch return address
//
// From this point on, the former stack has been restored.
//
ret