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Instead of turning optimization off, use unique labels with %= (thanks joerg@)

This commit is contained in:
christos 2020-02-14 04:20:59 +00:00
parent 8f0c4063f2
commit ff10eaacc1
1 changed files with 5 additions and 10 deletions
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15
tests/lib/libc/sys/t_ptrace_x86_wait.h
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@ -1,4 +1,4 @@
/* $NetBSD: t_ptrace_x86_wait.h,v 1.22 2020/02/13 18:31:54 tnn Exp $ */
/* $NetBSD: t_ptrace_x86_wait.h,v 1.23 2020/02/14 04:20:59 christos Exp $ */
/*-
* Copyright (c) 2016, 2017, 2018, 2019 The NetBSD Foundation, Inc.
@ -1972,11 +1972,6 @@ ATF_TC_HEAD(x86_cve_2018_8897, tc)
#define X86_CVE_2018_8897_PAGE 0x5000 /* page addressable by 32-bit registers */
static void
#ifdef __clang__
__attribute__((optnone))
#else
__attribute__((__optimize__("O0")))
#endif
x86_cve_2018_8897_trigger(void)
{
/*
@ -2077,13 +2072,13 @@ x86_cve_2018_8897_trigger(void)
);
#else /* !__PIE__ */
__asm__ __volatile__(
" movq $farjmp32, %%rax\n\t"
" movq $farjmp32%=, %%rax\n\t"
" ljmp *(%%rax)\n\t"
"farjmp32:\n\t"
" .long trigger32\n\t"
"farjmp32%=:\n\t"
" .long trigger32%=\n\t"
" .word 0x73\n\t"
" .code32\n\t"
"trigger32:\n\t"
"trigger32%=:\n\t"
" movl $0x5000, %%esp\n\t"
" pop %%ss\n\t"
" int $4\n\t"