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

diff --git a/arch/avr32/boot/u-boot/head.S b/arch/avr32/boot/u-boot/head.S
index 4488fa27fe948c2e73018e962628c7883327bf07..d36d865308df83cf76b2fcfe58bd95fec8799e95 100644 (file)
--- 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)

diff --git a/arch/avr32/kernel/head.S b/arch/avr32/kernel/head.S
index 6163bd0acb958ae3a016ec125a574764fec48c12..59eae6dfbed2b5f1167864bf6311b0b231da9a10 100644 (file)
--- a/arch/avr32/kernel/head.S
+++ b/arch/avr32/kernel/head.S
@@ -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