diff options
| author | Dave Aldridge <david.j.aldridge@oracle.com> | 2017-05-09 02:57:35 -0600 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-05-09 12:16:25 -0700 |
| commit | 3c7f62212018b904ae17f5636ead18a4dca3a88f (patch) | |
| tree | 3563b65cdb09b8257fcd890dbab0db14213c97d1 /arch | |
| parent | aed74ea0a09d2e60e4b3fe45caf30f6365b6c9f3 (diff) | |
| download | lwn-3c7f62212018b904ae17f5636ead18a4dca3a88f.tar.gz lwn-3c7f62212018b904ae17f5636ead18a4dca3a88f.zip | |
sparc64: fix fault handling in NGbzero.S and GENbzero.S
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc/kernel/head_64.S | 6 | ||||
| -rw-r--r-- | arch/sparc/lib/GENbzero.S | 2 | ||||
| -rw-r--r-- | arch/sparc/lib/NGbzero.S | 2 |
3 files changed, 8 insertions, 2 deletions
diff --git a/arch/sparc/kernel/head_64.S b/arch/sparc/kernel/head_64.S index 44101196d02b..41a407328667 100644 --- a/arch/sparc/kernel/head_64.S +++ b/arch/sparc/kernel/head_64.S @@ -939,3 +939,9 @@ 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; |