when use macro 'kputc' kphex' to print the content of
register r0-r3, they will corrupts these registers.
the same as the macro 'debug_reloc_start' and 'debug_reloc_end'.
so using 'push' when enter the macro and 'pop' when leave
the macro to fix it.
Signed-off-by: Wang Long <long.wangl...@huawei.com>
---
arch/arm/boot/compressed/head.S | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index 413fd94..aa57a09 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -19,6 +19,7 @@
* 100% relocatable. Any attempt to do so will result in a crash.
* Please select one of the following when turning on debugging.
*/
+#define DEBUG
#ifdef DEBUG
#if defined(CONFIG_DEBUG_ICEDCC)
@@ -69,18 +70,23 @@
#endif
.macro kputc,val
+ push {r0-r3}
mov r0, \val
bl putc
+ pop {r0-r3}
.endm
.macro kphex,val,len
+ push {r0-r3}
mov r0, \val
mov r1, #\len
bl phex
+ pop {r0-r3}
.endm
.macro debug_reloc_start
#ifdef DEBUG
+ push {r0-r3}
kputc #'\n'
kphex r6, 8 /* processor id */
kputc #':'
@@ -97,15 +103,18 @@
kputc #'>'
kphex r4, 8 /* kernel execution address */
kputc #'\n'
+ pop {r0-r3}
#endif
.endm
.macro debug_reloc_end
#ifdef DEBUG
+ push {r0-r3,r10-r12}
kphex r5, 8 /* end of kernel */
kputc #'\n'
mov r0, r4
bl memdump /* dump 256 bytes at start of kernel */
+ pop {r0-r3,r10-r12}
#endif
.endm
--
1.8.3.4
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