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LibC: Save callee saved registers on setjmp

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Bananymous
2025-05-04 13:54:35 +03:00
parent d457e6ad6a
commit 82f4975f45
4 changed files with 43 additions and 11 deletions
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19
userspace/libraries/LibC/arch/x86_64/setjmp.S
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@@ -1,3 +1,5 @@
// jmp_buf: rsp, rip, rbx, rbp, r12-r15
// int setjmp(jmp_buf env)
.global setjmp
setjmp:
@@ -7,6 +9,13 @@ setjmp:
movq (%rsp), %rax
movq %rax, 8(%rdi)
movq %rbx, 16(%rdi)
movq %rbp, 24(%rdi)
movq %r12, 32(%rdi)
movq %r13, 40(%rdi)
movq %r14, 48(%rdi)
movq %r15, 56(%rdi)
xorq %rax, %rax
ret
@@ -19,7 +28,13 @@ longjmp:
testq %rsi, %rsi
cmovnzq %rsi, %rax
movq 0(%rdi), %rsp
movq 8(%rdi), %rcx
movq 0(%rdi), %rsp
movq 8(%rdi), %rcx
movq 16(%rdi), %rbx
movq 24(%rdi), %rbp
movq 32(%rdi), %r12
movq 40(%rdi), %r13
movq 48(%rdi), %r14
movq 56(%rdi), %r15
jmp *%rcx
.size longjmp, . - longjmp