Commit 5247593c authored by Paul Brook's avatar Paul Brook Committed by Russell King
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[ARM] 3335/1: Old-abi Thumb sys_syscall broken



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: default avatarPaul Brook <paul@codesourcery.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 254a1564
......@@ -271,7 +271,7 @@ ENTRY(sys_call_table)
@ r8 = syscall table
.type sys_syscall, #function
sys_syscall:
eor scno, r0, #__NR_OABI_SYSCALL_BASE
bic scno, r0, #__NR_OABI_SYSCALL_BASE
cmp scno, #__NR_syscall - __NR_SYSCALL_BASE
cmpne scno, #NR_syscalls @ check range
stmloia sp, {r5, r6} @ shuffle args
......
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