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| author | Laurent Vivier <laurent@vivier.eu> | 2016-03-30 18:36:51 +0200 |
|---|---|---|
| committer | Riku Voipio <riku.voipio@linaro.org> | 2016-05-27 14:50:40 +0300 |
| commit | 49e55cbacf4ad08f831b9f3f9cb0f3082883a3a1 (patch) | |
| tree | fee064053f1ba14014304fc69e7c0be5e383cc16 /linux-user/signal.c | |
| parent | 5b1d59d0bb2a30d9fd8e8def88cba2ead7006ece (diff) | |
| download | qemu-49e55cbacf4ad08f831b9f3f9cb0f3082883a3a1.tar.gz | |
linux-user,target-ppc: fix use of MSR_LE
setup_frame()/setup_rt_frame()/restore_user_regs() are using
MSR_LE as the similar kernel functions do: as a bitmask.
But in QEMU, MSR_LE is a bit position, so change this
accordingly.
The previous code was doing nothing as MSR_LE is 0,
and "env->msr &= ~MSR_LE" doesn't change the value of msr.
And yes, a user process can change its endianness,
see linux kernel commit:
fab5db9 [PATCH] powerpc: Implement support for setting little-endian mode via prctl
and prctl(2): PR_SET_ENDIAN, PR_GET_ENDIAN
Reviewed-by: Thomas Huth <huth@tuxfamily.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Diffstat (limited to 'linux-user/signal.c')
| -rw-r--r-- | linux-user/signal.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/linux-user/signal.c b/linux-user/signal.c index 28ce92188d..8090b4de1f 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -4632,7 +4632,7 @@ static void restore_user_regs(CPUPPCState *env, /* If doing signal return, restore the previous little-endian mode. */ if (sig) - env->msr = (env->msr & ~MSR_LE) | (msr & MSR_LE); + env->msr = (env->msr & ~(1ull << MSR_LE)) | (msr & (1ull << MSR_LE)); /* Restore Altivec registers if necessary. */ if (env->insns_flags & PPC_ALTIVEC) { @@ -4747,7 +4747,7 @@ static void setup_frame(int sig, struct target_sigaction *ka, #endif /* Signal handlers are entered in big-endian mode. */ - env->msr &= ~MSR_LE; + env->msr &= ~(1ull << MSR_LE); unlock_user_struct(frame, frame_addr, 1); return; @@ -4842,7 +4842,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka, #endif /* Signal handlers are entered in big-endian mode. */ - env->msr &= ~MSR_LE; + env->msr &= ~(1ull << MSR_LE); unlock_user_struct(rt_sf, rt_sf_addr, 1); return; |