diff options
Diffstat (limited to 'arch/arm/kernel/entry-common.S')
| -rw-r--r-- | arch/arm/kernel/entry-common.S | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S index 65c58b34db97..07da010b67d4 100644 --- a/arch/arm/kernel/entry-common.S +++ b/arch/arm/kernel/entry-common.S @@ -27,7 +27,15 @@ ret_fast_syscall: ldr r1, [tsk, #TI_FLAGS] tst r1, #_TIF_WORK_MASK bne fast_work_pending - fast_restore_user_regs + + @ fast_restore_user_regs + ldr r1, [sp, #S_OFF + S_PSR] @ get calling cpsr + ldr lr, [sp, #S_OFF + S_PC]! @ get pc + msr spsr_cxsf, r1 @ save in spsr_svc + ldmdb sp, {r1 - lr}^ @ get calling r1 - lr + mov r0, r0 + add sp, sp, #S_FRAME_SIZE - S_PC + movs pc, lr @ return & move spsr_svc into cpsr /* * Ok, we need to do extra processing, enter the slow path. @@ -57,7 +65,14 @@ ret_slow_syscall: tst r1, #_TIF_WORK_MASK bne work_pending no_work_pending: - slow_restore_user_regs + @ slow_restore_user_regs + ldr r1, [sp, #S_PSR] @ get calling cpsr + ldr lr, [sp, #S_PC]! @ get pc + msr spsr_cxsf, r1 @ save in spsr_svc + ldmdb sp, {r0 - lr}^ @ get calling r1 - lr + mov r0, r0 + add sp, sp, #S_FRAME_SIZE - S_PC + movs pc, lr @ return & move spsr_svc into cpsr /* * This is how we return from a fork. @@ -109,7 +124,14 @@ ENTRY(ret_from_fork) .align 5 ENTRY(vector_swi) - save_user_regs + sub sp, sp, #S_FRAME_SIZE + stmia sp, {r0 - r12} @ Calling r0 - r12 + add r8, sp, #S_PC + stmdb r8, {sp, lr}^ @ Calling sp, lr + mrs r8, spsr @ called from non-FIQ mode, so ok. + str lr, [sp, #S_PC] @ Save calling PC + str r8, [sp, #S_PSR] @ Save CPSR + str r0, [sp, #S_OLD_R0] @ Save OLD_R0 zero_fp /* |