Qi Hu
1215317510
target/i386: Fix calculation of LOCK NEG eflags
After:
lock negl -0x14(%rbp)
pushf
pop %rax
%rax will contain the wrong value because the "lock neg" calculates the
wrong eflags. Simple test:
#include <assert.h>
int main()
{
__volatile__ unsigned test = 0x2363a;
__volatile__ char cond = 0;
asm(
"lock negl %0 \n\t"
"sets %1"
: "=m"(test), "=r"(cond));
assert(cond & 1);
return 0;
}
Reported-by: Jinyang Shen <shenjinyang@loongson.cn>
Co-Developed-by: Xuehai Chen <chenxuehai@loongson.cn>
Signed-off-by: Xuehai Chen <chenxuehai@loongson.cn>
Signed-off-by: Qi Hu <huqi@loongson.cn>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-10-31 09:46:34 +01:00
..
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