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| 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/sparc/kernel/head_64.S | |
| parent | sparc: use memdup_user_nul in sun4m LED driver (diff) | |
| download | linux-dev-3c7f62212018b904ae17f5636ead18a4dca3a88f.tar.xz linux-dev-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/sparc/kernel/head_64.S')
| -rw-r--r-- | arch/sparc/kernel/head_64.S | 6 |
1 files changed, 6 insertions, 0 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) |