diff options
Diffstat (limited to 'tools/include/nolibc/arch-x86_64.h')
| -rw-r--r-- | tools/include/nolibc/arch-x86_64.h | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/tools/include/nolibc/arch-x86_64.h b/tools/include/nolibc/arch-x86_64.h index 68609f421934..67305e24dbef 100644 --- a/tools/include/nolibc/arch-x86_64.h +++ b/tools/include/nolibc/arch-x86_64.h @@ -161,16 +161,15 @@ * 2) The deepest stack frame should be zero (the %rbp). * */ -void __attribute__((weak, noreturn, optimize("Os", "omit-frame-pointer"))) __no_stack_protector _start(void) +void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector _start(void) { __asm__ volatile ( "xor %ebp, %ebp\n" /* zero the stack frame */ "mov %rsp, %rdi\n" /* save stack pointer to %rdi, as arg1 of _start_c */ - "and $-16, %rsp\n" /* %rsp must be 16-byte aligned before call */ "call _start_c\n" /* transfer to c runtime */ "hlt\n" /* ensure it does not return */ ); - __builtin_unreachable(); + __nolibc_entrypoint_epilogue(); } #define NOLIBC_ARCH_HAS_MEMMOVE @@ -193,10 +192,10 @@ __asm__ ( "movq %rdi, %rdx\n\t" "subq %rsi, %rdx\n\t" "cmpq %rcx, %rdx\n\t" - "jb .Lbackward_copy\n\t" + "jb 1f\n\t" "rep movsb\n\t" "retq\n" -".Lbackward_copy:" +"1:" /* backward copy */ "leaq -1(%rdi, %rcx, 1), %rdi\n\t" "leaq -1(%rsi, %rcx, 1), %rsi\n\t" "std\n\t" |