From 4411b2aea7aa06d7b4aa5f4a7b36957af9b95e08 Mon Sep 17 00:00:00 2001 From: Tetsuyuki Kobayashi Date: Fri, 5 Apr 2013 00:12:51 +0000 Subject: [PATCH] BUGFIX: arm: data abort in get_bad_stack_swi When swi instruction is executed, it is expected to get message "software interrupt" in console and dump registers and reboot, as do_software_interrupt() in arch/arm/lib/interrupts.c. But, actually it causes data abort accessing wrong address in get_bad_stack_swi macro in arch/arm/cpu/v7/start.S. This patch fixes this problem. The same mistake in arch/arm/cpu/{arm1136,arm1176,pxa}/start.S. Signed-off-by: Tetsuyuki Kobayashi --- arch/arm/cpu/arm1136/start.S | 3 ++- arch/arm/cpu/arm1176/start.S | 4 +++- arch/arm/cpu/armv7/start.S | 3 ++- arch/arm/cpu/pxa/start.S | 3 ++- 4 files changed, 9 insertions(+), 4 deletions(-) diff --git a/arch/arm/cpu/arm1136/start.S b/arch/arm/cpu/arm1136/start.S index ad24b80..ccea2d5 100644 --- a/arch/arm/cpu/arm1136/start.S +++ b/arch/arm/cpu/arm1136/start.S @@ -388,8 +388,9 @@ cpu_init_crit: str r0, [r13] @ save R0's value. ldr r0, IRQ_STACK_START_IN @ get data regions start str lr, [r0] @ save caller lr in position 0 of saved stack - mrs r0, spsr @ get the spsr + mrs lr, spsr @ get the spsr str lr, [r0, #4] @ save spsr in position 1 of saved stack + ldr lr, [r0] @ restore lr ldr r0, [r13] @ restore r0 add r13, r13, #4 @ pop stack entry .endm diff --git a/arch/arm/cpu/arm1176/start.S b/arch/arm/cpu/arm1176/start.S index 1fc1da0..f20da8e 100644 --- a/arch/arm/cpu/arm1176/start.S +++ b/arch/arm/cpu/arm1176/start.S @@ -393,9 +393,11 @@ c_runtime_cpu_setup: /* save caller lr in position 0 of saved stack */ str lr, [r0] /* get the spsr */ - mrs r0, spsr + mrs lr, spsr /* save spsr in position 1 of saved stack */ str lr, [r0, #4] + /* restore lr */ + ldr lr, [r0] /* restore r0 */ ldr r0, [r13] /* pop stack entry */ diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S index 64008ba..61da7ac 100644 --- a/arch/arm/cpu/armv7/start.S +++ b/arch/arm/cpu/armv7/start.S @@ -463,9 +463,10 @@ ENDPROC(cpu_init_crit) @ spots for abort stack str lr, [r0] @ save caller lr in position 0 @ of saved stack - mrs r0, spsr @ get the spsr + mrs lr, spsr @ get the spsr str lr, [r0, #4] @ save spsr in position 1 of @ saved stack + ldr lr, [r0] @ restore lr ldr r0, [r13] @ restore r0 add r13, r13, #4 @ pop stack entry .endm diff --git a/arch/arm/cpu/pxa/start.S b/arch/arm/cpu/pxa/start.S index 3e07c7c..ada91a6 100644 --- a/arch/arm/cpu/pxa/start.S +++ b/arch/arm/cpu/pxa/start.S @@ -385,8 +385,9 @@ cpu_init_crit: str r0, [r13] @ save R0's value. ldr r0, IRQ_STACK_START_IN @ get data regions start str lr, [r0] @ save caller lr in position 0 of saved stack - mrs r0, spsr @ get the spsr + mrs lr, spsr @ get the spsr str lr, [r0, #4] @ save spsr in position 1 of saved stack + ldr lr, [r0] @ restore lr ldr r0, [r13] @ restore r0 add r13, r13, #4 @ pop stack entry .endm