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| author | Dave Kleikamp <dave.kleikamp@oracle.com> | 2014-03-14 10:42:01 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-03-17 15:54:52 -0400 |
| commit | 1535bd8adbdedd60a0ee62e28fd5225d66434371 (patch) | |
| tree | 6797e19f2f4362fdaf5a38d95b87aba771a21b23 /arch | |
| parent | e58e241c1788856f69d58821e91e5c988905252d (diff) | |
| download | lwn-1535bd8adbdedd60a0ee62e28fd5225d66434371.tar.gz lwn-1535bd8adbdedd60a0ee62e28fd5225d66434371.zip | |
sparc64: don't treat 64-bit syscall return codes as 32-bit
When checking a system call return code for an error,
linux_sparc_syscall was sign-extending the lower 32-bit value and
comparing it to -ERESTART_RESTARTBLOCK. lseek can return valid return
codes whose lower 32-bits alone would indicate a failure (such as 4G-1).
Use the whole 64-bit value to check for errors. Only the 32-bit path
should sign extend the lower 32-bit value.
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Acked-by: Bob Picco <bob.picco@oracle.com>
Acked-by: Allen Pais <allen.pais@oracle.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc/kernel/syscalls.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/sparc/kernel/syscalls.S b/arch/sparc/kernel/syscalls.S index 87729fff13b9..33a17e7b3ccd 100644 --- a/arch/sparc/kernel/syscalls.S +++ b/arch/sparc/kernel/syscalls.S @@ -189,7 +189,8 @@ linux_sparc_syscall32: mov %i0, %l5 ! IEU1 5: call %l7 ! CTI Group brk forced srl %i5, 0, %o5 ! IEU1 - ba,a,pt %xcc, 3f + ba,pt %xcc, 3f + sra %o0, 0, %o0 /* Linux native system calls enter here... */ .align 32 @@ -217,7 +218,6 @@ linux_sparc_syscall: 3: stx %o0, [%sp + PTREGS_OFF + PT_V9_I0] ret_sys_call: ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %g3 - sra %o0, 0, %o0 mov %ulo(TSTATE_XCARRY | TSTATE_ICARRY), %g2 sllx %g2, 32, %g2 |