[ARM] 5383/2: unwind: Add core support for ARM stack unwinding
This patch adds the main functionality for parsing the stack unwinding
information generated by the ARM EABI toolchains. The unwinding
information consists of an index with a pair of words per function and a
table with unwinding instructions. For more information, see "Exception
Handling ABI for the ARM Architecture" at:
http://infocenter.arm.com/help/topic/com.arm.doc.subset.swdev.abi/index.html
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index f68ca0f..57eb0f6 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -27,6 +27,7 @@
#include <asm/system.h>
#include <asm/unistd.h>
#include <asm/traps.h>
+#include <asm/unwind.h>
#include "ptrace.h"
#include "signal.h"
@@ -61,6 +62,7 @@
dump_mem("Exception stack", frame + 4, frame + 4 + sizeof(struct pt_regs));
}
+#ifndef CONFIG_ARM_UNWIND
/*
* Stack pointers should always be within the kernels view of
* physical memory. If it is not there, then we can't dump
@@ -74,6 +76,7 @@
return 0;
}
+#endif
/*
* Dump out the contents of some memory nicely...
@@ -150,6 +153,12 @@
set_fs(fs);
}
+#ifdef CONFIG_ARM_UNWIND
+static inline void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
+{
+ unwind_backtrace(regs, tsk);
+}
+#else
static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
{
unsigned int fp, mode;
@@ -184,6 +193,7 @@
if (ok)
c_backtrace(fp, mode);
}
+#endif
void dump_stack(void)
{