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| author | Florian Weimer <fweimer@redhat.com> | 2020-05-11 11:20:02 +0200 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2020-05-11 16:11:47 +0200 |
| commit | e627106266ad8785457fadbf5bf67ed604d2a353 (patch) | |
| tree | 39296463b2d7b64c06c672fecfbe64bc9a1bfeef | |
| parent | 61416e19218605a54e94edd9740bbe9d2785af6d (diff) | |
| download | glibc-e627106266ad8785457fadbf5bf67ed604d2a353.tar.gz glibc-e627106266ad8785457fadbf5bf67ed604d2a353.tar.xz glibc-e627106266ad8785457fadbf5bf67ed604d2a353.zip | |
POWER: Add context-synchronizing instructions to pkey_write [BZ #25954]
Sandipan Das reported that, "The Power ISA mandates that all writes to the Authority Mask Register (AMR) must always be preceded as well as succeeded by a context-synchronizing instruction. This applies to both the privileged and unprivileged variants of the Move To AMR instruction. This [requirement] is from Table 6 of Chapter 11 in page 1134 of Power ISA 3.0B. The document can be found here: <https://ibm.ent.box.com/s/1hzcwkwf8rbju5h9iyf44wm94amnlcrv> " See this kernel patch submission: <https://lore.kernel.org/linuxppc-dev/5f65cf37be993760de8112a88da194e3ccbb2bf8.1588959697.git.sandipan@linux.ibm.com/>
| -rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/powerpc64/arch-pkey.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/arch-pkey.h b/sysdeps/unix/sysv/linux/powerpc/powerpc64/arch-pkey.h index 623b073d5a..25d080c9a6 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/arch-pkey.h +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/arch-pkey.h @@ -37,7 +37,7 @@ pkey_read (void) static inline void pkey_write (unsigned long int value) { - __asm__ volatile ("mtspr 13, %0" : : "r" (value)); + __asm__ volatile ("isync; mtspr 13, %0; isync" : : "r" (value)); } /* Number of the largest supported key. This depends on the width of |