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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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76
Userland/Libraries/LibC/arch/x86_64/setjmp.S
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@ -4,34 +4,64 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <bits/sighow.h>
//
// /!\ Read setjmp.h before modifying this file!
//
.global setjmp
setjmp:
mov %rbx, (%rdi)
mov %rbp, 8(%rdi)
mov %r12, 16(%rdi)
mov %r13, 24(%rdi)
mov %r14, 32(%rdi)
mov %r15, 40(%rdi)
lea 8(%rsp), %rcx
mov %rcx, 48(%rdi)
mov (%rsp), %rcx
mov %rcx, 56(%rdi)
mov $0, %esi // Set val argument to 0
.global sigsetjmp
sigsetjmp:
mov %esi, 60(%rdi) // Store val into did_save_signal_mask
movl $0, 64(%rdi) // Clear saved_signal_mask
test %esi, %esi
jz .Lsaveregs
mov %rdi, %r12 // Preserve sigjmp_buf argument
mov $0, %rdi // Set argument how
mov $0, %rsi // Set argument set
lea 64(%rdi), %rdx // Set argument oldset
call sigprocmask
mov %r12, %rdi // Restore sigjmp_buf argument
.Lsaveregs:
mov %rbx, (0 * 8)(%rdi) // Save registers
mov %r12, (1 * 8)(%rdi)
mov %r13, (2 * 8)(%rdi)
mov %r14, (3 * 8)(%rdi)
mov %r15, (4 * 8)(%rdi)
mov %rbp, (5 * 8)(%rdi)
mov %rsp, (6 * 8)(%rdi)
mov (%rsp), %rax // Grab return address
mov %rax, (7 * 8)(%rdi)
xor %eax, %eax
ret
.global longjmp
longjmp:
mov (%rdi), %rbx
mov 8(%rdi), %rbp
mov 16(%rdi), %r12
mov 24(%rdi), %r13
mov 32(%rdi), %r14
mov 40(%rdi), %r15
mov 48(%rdi), %rsp
test %rsi, %rsi
jnz .nonzero
mov 1, %rax
.nonzero:
jmp *56(%rdi)
mov %esi, %eax
test %eax, %eax
jnz .Lnonzero
mov $1, %eax
.Lnonzero:
mov (0 * 8)(%rdi), %rbx // Restore registers
mov (1 * 8)(%rdi), %r12
mov (2 * 8)(%rdi), %r13
mov (3 * 8)(%rdi), %r14
mov (4 * 8)(%rdi), %r15
mov (5 * 8)(%rdi), %rbp
//
// Until this point, the stack is still from the caller.
//
mov (6 * 8)(%rdi), %rsp
mov (7 * 8)(%rdi), %rcx
mov %rcx, (%rsp) // Patch return address
//
// From this point on, the former stack has been restored.
//
ret