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-rw-r--r--arch/arm/kernel/signal.c38
1 files changed, 11 insertions, 27 deletions
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index ab330422527..04d63880037 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -21,29 +21,7 @@
#include <asm/unistd.h>
#include <asm/vfp.h>
-/*
- * For ARM syscalls, we encode the syscall number into the instruction.
- */
-#define SWI_SYS_SIGRETURN (0xef000000|(__NR_sigreturn)|(__NR_OABI_SYSCALL_BASE))
-#define SWI_SYS_RT_SIGRETURN (0xef000000|(__NR_rt_sigreturn)|(__NR_OABI_SYSCALL_BASE))
-
-/*
- * With EABI, the syscall number has to be loaded into r7.
- */
-#define MOV_R7_NR_SIGRETURN (0xe3a07000 | (__NR_sigreturn - __NR_SYSCALL_BASE))
-#define MOV_R7_NR_RT_SIGRETURN (0xe3a07000 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE))
-
-/*
- * For Thumb syscalls, we pass the syscall number via r7. We therefore
- * need two 16-bit instructions.
- */
-#define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_sigreturn - __NR_SYSCALL_BASE))
-#define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE))
-
-static const unsigned long sigreturn_codes[7] = {
- MOV_R7_NR_SIGRETURN, SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN,
- MOV_R7_NR_RT_SIGRETURN, SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN,
-};
+extern const unsigned long sigreturn_codes[7];
static unsigned long signal_return_offset;
@@ -375,12 +353,18 @@ setup_return(struct pt_regs *regs, struct ksignal *ksig,
*/
thumb = handler & 1;
- if (thumb) {
- cpsr |= PSR_T_BIT;
#if __LINUX_ARM_ARCH__ >= 7
- /* clear the If-Then Thumb-2 execution state */
- cpsr &= ~PSR_IT_MASK;
+ /*
+ * Clear the If-Then Thumb-2 execution state
+ * ARM spec requires this to be all 000s in ARM mode
+ * Snapdragon S4/Krait misbehaves on a Thumb=>ARM
+ * signal transition without this.
+ */
+ cpsr &= ~PSR_IT_MASK;
#endif
+
+ if (thumb) {
+ cpsr |= PSR_T_BIT;
} else
cpsr &= ~PSR_T_BIT;
}