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authorCatalin Marinas <catalin.marinas@arm.com>2009-02-16 11:41:36 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2009-02-19 11:26:24 +0000
commitbff595c15c92b9c5c8f3d32edefcef6c3cbdd59f (patch)
tree182cc7840fbd09630d273f18d5b7720655bb4a37 /arch/arm/kernel/traps.c
parent2d7c11bfc91637e5f9bc5f8c9a82aaffcc0e97aa (diff)
[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>
Diffstat (limited to 'arch/arm/kernel/traps.c')
-rw-r--r--arch/arm/kernel/traps.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index f68ca0fb0ed..57eb0f6f600 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 @@ void dump_backtrace_entry(unsigned long where, unsigned long from, unsigned long
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 @@ static int verify_stack(unsigned long sp)
return 0;
}
+#endif
/*
* Dump out the contents of some memory nicely...
@@ -150,6 +153,12 @@ static void dump_instr(struct pt_regs *regs)
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 @@ static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
if (ok)
c_backtrace(fp, mode);
}
+#endif
void dump_stack(void)
{