diff options
| author | Andreas Bießmann <andreas@biessmann.de> | 2013-10-24 12:31:03 +0200 |
|---|---|---|
| committer | Hans-Christian Egtvedt <hegtvedt@cisco.com> | 2013-11-20 09:53:21 +0100 |
| commit | 7a2a74f4b856993218aa7cdeeb6c3103101340db (patch) | |
| tree | a33d46eda9bf3a8c28e90b34e0868426ecd7b0f8 /arch/avr32/boot | |
| parent | b4789b8e6be3151a955ade74872822f30e8cd914 (diff) | |
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
Diffstat (limited to 'arch/avr32/boot')
| -rw-r--r-- | arch/avr32/boot/u-boot/head.S | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/arch/avr32/boot/u-boot/head.S b/arch/avr32/boot/u-boot/head.S index 4488fa27fe94..d36d865308df 100644 --- a/arch/avr32/boot/u-boot/head.S +++ b/arch/avr32/boot/u-boot/head.S @@ -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) |