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avr32: setup crt for early panic() 

Before the CRT was (fully) set up in kernel_entry (bss cleared before in
_start, but also not before jump to panic() in no_tag_table case).

This patch fixes this up to have a fully working CRT when branching to panic()
in no_tag_table.

Signed-off-by: Andreas Bießmann <andreas@biessmann.de>
Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Andreas Bießmann 2013-10-24 12:31:03 +02:00 committed by Hans-Christian Egtvedt
parent b4789b8e6b
commit 7a2a74f4b8
2 changed files with 25 additions and 25 deletions
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30
arch/avr32/boot/u-boot/head.S
View File

@ -8,6 +8,8 @@
* published by the Free Software Foundation.
*/
#include <asm/setup.h>
#include <asm/thread_info.h>
#include <asm/sysreg.h>
/*
* The kernel is loaded where we want it to be and all caches
@ -20,11 +22,6 @@
.section .init.text,"ax"
.global _start
_start:
/* Check if the boot loader actually provided a tag table */
lddpc r0, magic_number
cp.w r12, r0
brne no_tag_table
/* Initialize .bss */
lddpc r2, bss_start_addr
lddpc r3, end_addr
@ -34,6 +31,25 @@ _start:
cp r2, r3
brlo 1b
/* Initialize status register */
lddpc r0, init_sr
mtsr SYSREG_SR, r0
/* Set initial stack pointer */
lddpc sp, stack_addr
sub sp, -THREAD_SIZE
#ifdef CONFIG_FRAME_POINTER
/* Mark last stack frame */
mov lr, 0
mov r7, 0
#endif
/* Check if the boot loader actually provided a tag table */
lddpc r0, magic_number
cp.w r12, r0
brne no_tag_table
/*
* Save the tag table address for later use. This must be done
* _after_ .bss has been initialized...
@ -53,6 +69,10 @@ bss_start_addr:
.long __bss_start
end_addr:
.long _end
init_sr:
.long 0x007f0000 /* Supervisor mode, everything masked */
stack_addr:
.long init_thread_union
no_tag_table:
sub r12, pc, (. - 2f)

20
arch/avr32/kernel/head.S
View File

@ -10,33 +10,13 @@
#include <linux/linkage.h>
#include <asm/page.h>
#include <asm/thread_info.h>
#include <asm/sysreg.h>
.section .init.text,"ax"
.global kernel_entry
kernel_entry:
/* Initialize status register */
lddpc r0, init_sr
mtsr SYSREG_SR, r0
/* Set initial stack pointer */
lddpc sp, stack_addr
sub sp, -THREAD_SIZE
#ifdef CONFIG_FRAME_POINTER
/* Mark last stack frame */
mov lr, 0
mov r7, 0
#endif
/* Start the show */
lddpc pc, kernel_start_addr
.align 2
init_sr:
.long 0x007f0000 /* Supervisor mode, everything masked */
stack_addr:
.long init_thread_union
kernel_start_addr:
.long start_kernel