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authorAnton Blanchard <anton@samba.org>2013-05-01 20:06:33 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-05-06 09:25:35 +1000
commit73d2fb758e678c93bc76d40876c2359f0729b0ef (patch)
treed4831170cd6c5373f0daab7589e70a4821c9099d /arch/powerpc/include/asm
parent01227a889ed56ae53aeebb9f93be9d54dd8b2de8 (diff)
downloadop-kernel-dev-73d2fb758e678c93bc76d40876c2359f0729b0ef.zip
op-kernel-dev-73d2fb758e678c93bc76d40876c2359f0729b0ef.tar.gz
powerpc: Emulate non privileged DSCR read and write
POWER8 allows read and write of the DSCR in userspace. We added kernel emulation so applications could always use the instructions regardless of the CPU type. Unfortunately there are two SPRs for the DSCR and we only added emulation for the privileged one. Add code to match the non privileged one. A simple test was created to verify the fix: http://ozlabs.org/~anton/junkcode/user_dscr_test.c Without the patch we get a SIGILL and it passes with the patch. Signed-off-by: Anton Blanchard <anton@samba.org> Cc: <stable@kernel.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm')
-rw-r--r--arch/powerpc/include/asm/ppc-opcode.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h
index 0c34e48..eccfc16 100644
--- a/arch/powerpc/include/asm/ppc-opcode.h
+++ b/arch/powerpc/include/asm/ppc-opcode.h
@@ -115,6 +115,10 @@
#define PPC_INST_MFSPR_DSCR_MASK 0xfc1fffff
#define PPC_INST_MTSPR_DSCR 0x7c1103a6
#define PPC_INST_MTSPR_DSCR_MASK 0xfc1fffff
+#define PPC_INST_MFSPR_DSCR_USER 0x7c0302a6
+#define PPC_INST_MFSPR_DSCR_USER_MASK 0xfc1fffff
+#define PPC_INST_MTSPR_DSCR_USER 0x7c0303a6
+#define PPC_INST_MTSPR_DSCR_USER_MASK 0xfc1fffff
#define PPC_INST_SLBFEE 0x7c0007a7
#define PPC_INST_STRING 0x7c00042a
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