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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2006-09-26 23:44:01 +0900
committerRalf Baechle <ralf@linux-mips.org>2006-10-01 23:16:57 +0100
commit1df0f0ff7e56f6dcb1351b9490d55ebf91ff4bd8 (patch)
treef309b9cf0293c973683b4fa3fab5bbb74e415d47 /include/asm-mips/stacktrace.h
parenteae6c0da9df81300895949897c0451423340ac40 (diff)
[MIPS] lockdep: Add STACKTRACE_SUPPORT and enable LOCKDEP_SUPPORT
Implement stacktrace interface by using unwind_stack() and enable lockdep support in Kconfig. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'include/asm-mips/stacktrace.h')
-rw-r--r--include/asm-mips/stacktrace.h44
1 files changed, 44 insertions, 0 deletions
diff --git a/include/asm-mips/stacktrace.h b/include/asm-mips/stacktrace.h
new file mode 100644
index 000000000000..231f6f897a61
--- /dev/null
+++ b/include/asm-mips/stacktrace.h
@@ -0,0 +1,44 @@
+#ifndef _ASM_STACKTRACE_H
+#define _ASM_STACKTRACE_H
+
+#include <asm/ptrace.h>
+
+#ifdef CONFIG_KALLSYMS
+extern int raw_show_trace;
+extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
+ unsigned long pc, unsigned long ra);
+#else
+#define raw_show_trace 1
+#define unwind_stack(task, sp, pc, ra) 0
+#endif
+
+static __always_inline void prepare_frametrace(struct pt_regs *regs)
+{
+#ifndef CONFIG_KALLSYMS
+ /*
+ * Remove any garbage that may be in regs (specially func
+ * addresses) to avoid show_raw_backtrace() to report them
+ */
+ memset(regs, 0, sizeof(*regs));
+#endif
+ __asm__ __volatile__(
+ ".set push\n\t"
+ ".set noat\n\t"
+#ifdef CONFIG_64BIT
+ "1: dla $1, 1b\n\t"
+ "sd $1, %0\n\t"
+ "sd $29, %1\n\t"
+ "sd $31, %2\n\t"
+#else
+ "1: la $1, 1b\n\t"
+ "sw $1, %0\n\t"
+ "sw $29, %1\n\t"
+ "sw $31, %2\n\t"
+#endif
+ ".set pop\n\t"
+ : "=m" (regs->cp0_epc),
+ "=m" (regs->regs[29]), "=m" (regs->regs[31])
+ : : "memory");
+}
+
+#endif /* _ASM_STACKTRACE_H */