From 7a2a74f4b856993218aa7cdeeb6c3103101340db Mon Sep 17 00:00:00 2001 From: =?utf8?q?Andreas=20Bie=C3=9Fmann?= Date: Thu, 24 Oct 2013 12:31:03 +0200 Subject: [PATCH] avr32: setup crt for early panic() MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Acked-by: Hans-Christian Egtvedt Cc: Haavard Skinnemoen Cc: stable@vger.kernel.org --- arch/avr32/boot/u-boot/head.S | 30 +++++++++++++++++++++++++----- arch/avr32/kernel/head.S | 20 -------------------- 2 files changed, 25 insertions(+), 25 deletions(-) diff --git a/arch/avr32/boot/u-boot/head.S b/arch/avr32/boot/u-boot/head.S index 4488fa2..d36d865 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 +#include +#include /* * 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) diff --git a/arch/avr32/kernel/head.S b/arch/avr32/kernel/head.S index 6163bd0..59eae6d 100644 --- a/arch/avr32/kernel/head.S +++ b/arch/avr32/kernel/head.S @@ -10,33 +10,13 @@ #include #include -#include -#include .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 -- 2.7.4