kamkow1
bea4ddd2c8
All checks were successful
Build documentation / build-and-deploy (push) Successful in 3m9s
35 lines
1.2 KiB
C
35 lines
1.2 KiB
C
#include <setjmp.h>
|
|
|
|
/* https://nullprogram.com/blog/2023/02/12 */
|
|
|
|
__attribute__ ((naked, returns_twice)) int setjmp (jmp_buf buf) {
|
|
__asm__ volatile ("mov (%rsp), %rax\n"
|
|
"mov %rax, 0(%rcx)\n"
|
|
"lea 8(%rsp), %rax\n"
|
|
"mov %rax, 8(%rcx)\n"
|
|
"mov %rbp, 16(%rcx)\n"
|
|
"mov %rbx, 24(%rcx)\n"
|
|
"mov %rdi, 32(%rcx)\n"
|
|
"mov %rsi, 40(%rcx)\n"
|
|
"mov %r12, 48(%rcx)\n"
|
|
"mov %r13, 56(%rcx)\n"
|
|
"mov %r14, 64(%rcx)\n"
|
|
"mov %r15, 72(%rcx)\n"
|
|
"xor %eax, %eax\n"
|
|
"ret\n");
|
|
}
|
|
|
|
__attribute__ ((naked, noreturn)) void longjmp (jmp_buf buf, int ret) {
|
|
__asm__ volatile ("mov 72(%rcx), %r15\n"
|
|
"mov 64(%rcx), %r14\n"
|
|
"mov 56(%rcx), %r13\n"
|
|
"mov 48(%rcx), %r12\n"
|
|
"mov 40(%rcx), %rsi\n"
|
|
"mov 32(%rcx), %rdi\n"
|
|
"mov 24(%rcx), %rbx\n"
|
|
"mov 16(%rcx), %rbp\n"
|
|
"mov 8(%rcx), %rsp\n"
|
|
"mov %edx, %eax\n"
|
|
"jmp *0(%rcx)\n");
|
|
}
|