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| author | Paolo Bonzini | 2022-10-07 15:47:35 +0200 |
|---|---|---|
| committer | Paolo Bonzini | 2022-10-11 09:36:01 +0200 |
| commit | 5154d35beda383af8042061099a5cd2decf88e69 (patch) | |
| tree | 2cd570bb468dce8c15cfb950b9c51c8c81f926b9 /linux-user | |
| parent | KVM: x86: Implement MSR_CORE_THREAD_COUNT MSR (diff) | |
| download | qemu-5154d35beda383af8042061099a5cd2decf88e69.tar.gz qemu-5154d35beda383af8042061099a5cd2decf88e69.tar.xz qemu-5154d35beda383af8042061099a5cd2decf88e69.zip | |
linux-user: i386/signal: move fpstate at the end of the 32-bit frames
Recent versions of Linux moved the 32-bit fpstate towards the end of the
frame, so that the variable-sized xsave data does not overwrite the
(ABI-defined) extramask[] field. Follow suit in QEMU.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'linux-user')
| -rw-r--r-- | linux-user/i386/signal.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/linux-user/i386/signal.c b/linux-user/i386/signal.c index 4372621a4d..76317a3d16 100644 --- a/linux-user/i386/signal.c +++ b/linux-user/i386/signal.c @@ -163,9 +163,16 @@ struct sigframe { abi_ulong pretcode; int sig; struct target_sigcontext sc; - struct target_fpstate fpstate; + /* + * The actual fpstate is placed after retcode[] below, to make + * room for the variable-sized xsave data. The older unused fpstate + * has to be kept to avoid changing the offset of extramask[], which + * is part of the ABI. + */ + struct target_fpstate fpstate_unused; abi_ulong extramask[TARGET_NSIG_WORDS-1]; char retcode[8]; + struct target_fpstate fpstate; }; struct rt_sigframe { @@ -175,8 +182,8 @@ struct rt_sigframe { abi_ulong puc; struct target_siginfo info; struct target_ucontext uc; - struct target_fpstate fpstate; char retcode[8]; + struct target_fpstate fpstate; }; #else |