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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>
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3 changed files with 8 additions and 2 deletions
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@ -939,3 +939,9 @@ ENTRY(__retl_o1)
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retl
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mov %o1, %o0
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ENDPROC(__retl_o1)
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ENTRY(__retl_o1_asi)
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wr %o5, 0x0, %asi
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retl
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mov %o1, %o0
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ENDPROC(__retl_o1_asi)
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@ -8,7 +8,7 @@
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98: x,y; \
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.section __ex_table,"a";\
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.align 4; \
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.word 98b, __retl_o1; \
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.word 98b, __retl_o1_asi;\
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.text; \
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.align 4;
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@ -8,7 +8,7 @@
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98: x,y; \
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.section __ex_table,"a";\
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.align 4; \
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.word 98b, __retl_o1; \
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.word 98b, __retl_o1_asi;\
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.text; \
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.align 4;
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