From 5247593c9634309d1b9f7b549495b8e5ad521688 Mon Sep 17 00:00:00 2001
From: Paul Brook <paul@codesourcery.com>
Date: Tue, 16 May 2006 14:25:55 +0100
Subject: [PATCH] [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: Paul Brook <paul@codesourcery.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
arch/arm/kernel/entry-common.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index dbcb11a31f781..b5bcebca1cd65 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -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
--
2.30.2