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arch/x64:Fix the issue where RFLAGS is not restored after a syscall return

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When a syscall is invoked, the RFLAGS register is saved into R11. It must be restored before returning

Signed-off-by: liwenxiang1 <liwenxiang1@xiaomi.com>
This commit is contained in:
liwenxiang1
2025-05-28 10:53:02 +08:00
committed by Xiang Xiao
parent 794c325947
commit addc6b165a
1 changed files with 4 additions and 0 deletions
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arch/x86_64/src/intel64/intel64_head.S
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@@ -696,6 +696,10 @@ no_kstack_switch:
syscall_no_ring3: syscall_no_ring3:
# endif # endif
/* Restore the value of RFLAGS from R11 */
pushq %r11
popfq
/* Return to address pointed in RCX - must be on stack */ /* Return to address pointed in RCX - must be on stack */
pushq %rcx pushq %rcx
ret ret