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[ARM] 3335/1: Old-abi Thumb sys_syscall broken

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Patch from Paul Brook

The old-abi sys_syscall syscall is broken when called from Thumb mode. It
assumes the syscall number is an Arm syscall number (ie. starts from
__NR_OABI_SYSCALL_BASE).  In thumb mode syscall numbers start from zero.

The patch below fixes this by clearing the nigh bits of the syscall number
instead of inverting them. Technically this means we accept some invalid
syscall numbers, but I can't see how that could be a problem. The two sets of
numbers far apart that unimplemented syscalls should still be rejected.

Signed-off-by: Paul Brook <paul@codesourcery.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Paul Brook 2006-05-16 14:25:55 +01:00 committed by Russell King
parent 254a1564fb
commit 5247593c96
1 changed files with 1 additions and 1 deletions
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2
arch/arm/kernel/entry-common.S
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@ -271,7 +271,7 @@ ENTRY(sys_call_table)
@ r8 = syscall table @ r8 = syscall table
.type sys_syscall, #function .type sys_syscall, #function
sys_syscall: sys_syscall:
eor scno, r0, #__NR_OABI_SYSCALL_BASE bic scno, r0, #__NR_OABI_SYSCALL_BASE
cmp scno, #__NR_syscall - __NR_SYSCALL_BASE cmp scno, #__NR_syscall - __NR_SYSCALL_BASE
cmpne scno, #NR_syscalls @ check range cmpne scno, #NR_syscalls @ check range
stmloia sp, {r5, r6} @ shuffle args stmloia sp, {r5, r6} @ shuffle args