diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-11-09 23:53:29 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-11-10 08:41:12 +0000 |
| commit | cc20d42986d5807cbe4f5c7c8e3dab2e59ea0db3 (patch) | |
| tree | aa71962250e2548a5079b5556436d924e14292fe /arch/arm | |
| parent | bfd2e29f04e5f048ea62677811d1244badd6661e (diff) | |
ARM: Use a definition for the userspace cmpxchg emulation syscall
Use a definition for the cmpxchg SWI instead of hard-coding the number.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/include/asm/unistd.h | 9 | ||||
| -rw-r--r-- | arch/arm/kernel/entry-armv.S | 7 | ||||
| -rw-r--r-- | arch/arm/kernel/traps.c | 2 |
3 files changed, 14 insertions, 4 deletions
diff --git a/arch/arm/include/asm/unistd.h b/arch/arm/include/asm/unistd.h index 7020217fc49..4e506d09e5f 100644 --- a/arch/arm/include/asm/unistd.h +++ b/arch/arm/include/asm/unistd.h @@ -403,6 +403,15 @@ #define __ARM_NR_set_tls (__ARM_NR_BASE+5) /* + * *NOTE*: This is a ghost syscall private to the kernel. Only the + * __kuser_cmpxchg code in entry-armv.S should be aware of its + * existence. Don't ever use this from user code. + */ +#ifdef __KERNEL__ +#define __ARM_NR_cmpxchg (__ARM_NR_BASE+0x00fff0) +#endif + +/* * The following syscalls are obsolete and no longer available for EABI. */ #if defined(__ARM_EABI__) && !defined(__KERNEL__) diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index 0022b4d57f8..d2903e3bc86 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -21,6 +21,7 @@ #include <mach/entry-macro.S> #include <asm/thread_notify.h> #include <asm/unwind.h> +#include <asm/unistd.h> #include "entry-header.S" @@ -908,10 +909,10 @@ __kuser_cmpxchg: @ 0xffff0fc0 * A special ghost syscall is used for that (see traps.c). */ stmfd sp!, {r7, lr} - mov r7, #0xff00 @ 0xfff0 into r7 for EABI - orr r7, r7, #0xf0 - swi #0x9ffff0 + ldr r7, =1f @ it's 20 bits + swi __ARM_NR_cmpxchg ldmfd sp!, {r7, pc} +1: .word __ARM_NR_cmpxchg #elif __LINUX_ARM_ARCH__ < 6 diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 1bbda04a538..3f361a783f4 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -528,7 +528,7 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs) * __kuser_cmpxchg code in entry-armv.S should be aware of its * existence. Don't ever use this from user code. */ - case 0xfff0: + case NR(cmpxchg): for (;;) { extern void do_DataAbort(unsigned long addr, unsigned int fsr, struct pt_regs *regs); |