From fc00c656c96528112d05cf0edf8631bd5eaea446 Mon Sep 17 00:00:00 2001 From: Kacper Date: Sun, 7 Dec 2025 20:10:31 +0100 Subject: Add build system scaffolding and libc headers --- lib/libc/arch/x86_64/longjmp.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100644 lib/libc/arch/x86_64/longjmp.c (limited to 'lib/libc/arch/x86_64/longjmp.c') diff --git a/lib/libc/arch/x86_64/longjmp.c b/lib/libc/arch/x86_64/longjmp.c new file mode 100644 index 00000000..6aed69a5 --- /dev/null +++ b/lib/libc/arch/x86_64/longjmp.c @@ -0,0 +1,18 @@ +#include + +__attribute__((noreturn, naked, returns_twice)) void longjmp(jmp_buf env, + int val) +{ + __asm__ __volatile__("mov 0(%rdi), %rbx\n" + "mov 8(%rdi), %rbp\n" + "mov 16(%rdi), %r12\n" + "mov 24(%rdi), %r13\n" + "mov 32(%rdi), %r14\n" + "mov 40(%rdi), %r15\n" + "mov 48(%rdi), %rsp\n" + "xor %rax, %rax\n" + "cmp $0, %esi\n" + "setne %al\n" + "mov %eax, %eax\n" + "jmp *56(%rdi)\n"); +} -- cgit v1.2.3