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-rw-r--r--arch/arm/lib/backtrace-clang.S14
1 files changed, 11 insertions, 3 deletions
diff --git a/arch/arm/lib/backtrace-clang.S b/arch/arm/lib/backtrace-clang.S
index 5b2cdb1003e3..290c52a60fc6 100644
--- a/arch/arm/lib/backtrace-clang.S
+++ b/arch/arm/lib/backtrace-clang.S
@@ -144,7 +144,7 @@ for_each_frame: tst frame, mask @ Check for address exceptions
*/
1003: ldr sv_lr, [sv_fp, #4] @ get saved lr from next frame
- ldr r0, [sv_lr, #-4] @ get call instruction
+1004: ldr r0, [sv_lr, #-4] @ get call instruction
ldr r3, .Lopcode+4
and r2, r3, r0 @ is this a bl call
teq r2, r3
@@ -164,7 +164,7 @@ finished_setup:
/*
* Print the function (sv_pc) and where it was called from (sv_lr).
*/
-1004: mov r0, sv_pc
+ mov r0, sv_pc
mov r1, sv_lr
mov r2, frame
@@ -197,6 +197,14 @@ finished_setup:
cmp sv_fp, frame @ next frame must be
mov frame, sv_fp @ above the current frame
+#ifdef CONFIG_IRQSTACKS
+ @
+ @ Kernel stacks may be discontiguous in memory. If the next
+ @ frame is below the previous frame, accept it as long as it
+ @ lives in kernel memory.
+ @
+ cmpls sv_fp, #PAGE_OFFSET
+#endif
bhi for_each_frame
1006: adr r0, .Lbad
@@ -210,7 +218,7 @@ ENDPROC(c_backtrace)
.long 1001b, 1006b
.long 1002b, 1006b
.long 1003b, 1006b
- .long 1004b, 1006b
+ .long 1004b, finished_setup
.long 1005b, 1006b
.popsection