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authorDave Aldridge <david.j.aldridge@oracle.com>2017-05-09 02:57:35 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-05-14 14:00:20 +0200
commit22d6b013ffcf4809b4fe03b240855c6f8eb54599 (patch)
treea1207f0ce1dc3670c15b49aca1dcd5c9933186a7 /arch/sparc
parent7aa0e14336d977101193bef85af69b203bfba24f (diff)
sparc64: fix fault handling in NGbzero.S and GENbzero.S
commit 3c7f62212018b904ae17f5636ead18a4dca3a88f upstream. When any of the functions contained in NGbzero.S and GENbzero.S vector through *bzero_from_clear_user, we may end up taking a fault when executing one of the store alternate address space instructions. If this happens, the exception handler does not restore the %asi register. This commit fixes the issue by introducing a new exception handler that ensures the %asi register is restored when a fault is handled. Orabug: 25577560 Signed-off-by: Dave Aldridge <david.j.aldridge@oracle.com> Reviewed-by: Rob Gardner <rob.gardner@oracle.com> Reviewed-by: Babu Moger <babu.moger@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/sparc')
-rw-r--r--arch/sparc/kernel/head_64.S6
-rw-r--r--arch/sparc/lib/GENbzero.S2
-rw-r--r--arch/sparc/lib/NGbzero.S2
3 files changed, 8 insertions, 2 deletions
diff --git a/arch/sparc/kernel/head_64.S b/arch/sparc/kernel/head_64.S
index 6aa3da152c20..9835152a0682 100644
--- a/arch/sparc/kernel/head_64.S
+++ b/arch/sparc/kernel/head_64.S
@@ -935,3 +935,9 @@ ENTRY(__retl_o1)
retl
mov %o1, %o0
ENDPROC(__retl_o1)
+
+ENTRY(__retl_o1_asi)
+ wr %o5, 0x0, %asi
+ retl
+ mov %o1, %o0
+ENDPROC(__retl_o1_asi)
diff --git a/arch/sparc/lib/GENbzero.S b/arch/sparc/lib/GENbzero.S
index 8e7a843ddd88..2fbf6297d57c 100644
--- a/arch/sparc/lib/GENbzero.S
+++ b/arch/sparc/lib/GENbzero.S
@@ -8,7 +8,7 @@
98: x,y; \
.section __ex_table,"a";\
.align 4; \
- .word 98b, __retl_o1; \
+ .word 98b, __retl_o1_asi;\
.text; \
.align 4;
diff --git a/arch/sparc/lib/NGbzero.S b/arch/sparc/lib/NGbzero.S
index beab29bf419b..33053bdf3766 100644
--- a/arch/sparc/lib/NGbzero.S
+++ b/arch/sparc/lib/NGbzero.S
@@ -8,7 +8,7 @@
98: x,y; \
.section __ex_table,"a";\
.align 4; \
- .word 98b, __retl_o1; \
+ .word 98b, __retl_o1_asi;\
.text; \
.align 4;