[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>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 30750c5..ba3a317 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1841,6 +1841,14 @@
bool
default y
+config LOCKDEP_SUPPORT
+ bool
+ default y
+
+config STACKTRACE_SUPPORT
+ bool
+ default y
+
source "init/Kconfig"
menu "Bus options (PCI, PCMCIA, EISA, ISA, TC)"
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile
index 881c467..cd9cec9 100644
--- a/arch/mips/kernel/Makefile
+++ b/arch/mips/kernel/Makefile
@@ -11,6 +11,7 @@
binfmt_irix-objs := irixelf.o irixinv.o irixioctl.o irixsig.o \
irix5sys.o sysirix.o
+obj-$(CONFIG_STACKTRACE) += stacktrace.o
obj-$(CONFIG_MODULES) += mips_ksyms.o module.o
obj-$(CONFIG_APM) += apm.o
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 2613a0d..6955380 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -40,6 +40,7 @@
#include <asm/elf.h>
#include <asm/isadep.h>
#include <asm/inst.h>
+#include <asm/stacktrace.h>
#ifdef CONFIG_MIPS_MT_SMTC
#include <asm/mipsmtregs.h>
extern void smtc_idle_loop_hook(void);
diff --git a/arch/mips/kernel/stacktrace.c b/arch/mips/kernel/stacktrace.c
new file mode 100644
index 0000000..f851d0c
--- /dev/null
+++ b/arch/mips/kernel/stacktrace.c
@@ -0,0 +1,111 @@
+/*
+ * arch/mips/kernel/stacktrace.c
+ *
+ * Stack trace management functions
+ *
+ * Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
+ */
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+#include <asm/stacktrace.h>
+
+/*
+ * Save stack-backtrace addresses into a stack_trace buffer:
+ */
+static void save_raw_context_stack(struct stack_trace *trace,
+ unsigned int skip, unsigned long reg29)
+{
+ unsigned long *sp = (unsigned long *)reg29;
+ unsigned long addr;
+
+ while (!kstack_end(sp)) {
+ addr = *sp++;
+ if (__kernel_text_address(addr)) {
+ if (!skip)
+ trace->entries[trace->nr_entries++] = addr;
+ else
+ skip--;
+ if (trace->nr_entries >= trace->max_entries)
+ break;
+ }
+ }
+}
+
+static struct pt_regs * save_context_stack(struct stack_trace *trace,
+ unsigned int skip, struct task_struct *task, struct pt_regs *regs)
+{
+ unsigned long sp = regs->regs[29];
+#ifdef CONFIG_KALLSYMS
+ unsigned long ra = regs->regs[31];
+ unsigned long pc = regs->cp0_epc;
+ extern void ret_from_irq(void);
+
+ if (raw_show_trace || !__kernel_text_address(pc)) {
+ save_raw_context_stack(trace, skip, sp);
+ return NULL;
+ }
+ do {
+ if (!skip)
+ trace->entries[trace->nr_entries++] = pc;
+ else
+ skip--;
+ if (trace->nr_entries >= trace->max_entries)
+ break;
+ /*
+ * If we reached the bottom of interrupt context,
+ * return saved pt_regs.
+ */
+ if (pc == (unsigned long)ret_from_irq) {
+ unsigned long stack_page =
+ (unsigned long)task_stack_page(task);
+ if (!stack_page ||
+ sp < stack_page ||
+ sp > stack_page + THREAD_SIZE - 32)
+ break;
+ return (struct pt_regs *)sp;
+ }
+ pc = unwind_stack(task, &sp, pc, ra);
+ ra = 0;
+ } while (pc);
+#else
+ save_raw_context_stack(sp);
+#endif
+
+ return NULL;
+}
+
+/*
+ * Save stack-backtrace addresses into a stack_trace buffer.
+ * If all_contexts is set, all contexts (hardirq, softirq and process)
+ * are saved. If not set then only the current context is saved.
+ */
+void save_stack_trace(struct stack_trace *trace,
+ struct task_struct *task, int all_contexts,
+ unsigned int skip)
+{
+ struct pt_regs dummyregs;
+ struct pt_regs *regs = &dummyregs;
+
+ WARN_ON(trace->nr_entries || !trace->max_entries);
+
+ if (task && task != current) {
+ regs->regs[29] = task->thread.reg29;
+ regs->regs[31] = 0;
+ regs->cp0_epc = task->thread.reg31;
+ } else {
+ if (!task)
+ task = current;
+ prepare_frametrace(regs);
+ }
+
+ while (1) {
+ regs = save_context_stack(trace, skip, task, regs);
+ if (!all_contexts || !regs ||
+ trace->nr_entries >= trace->max_entries)
+ break;
+ trace->entries[trace->nr_entries++] = ULONG_MAX;
+ if (trace->nr_entries >= trace->max_entries)
+ break;
+ skip = 0;
+ }
+}
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index e51d8fd..440b865 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -41,6 +41,7 @@
#include <asm/mmu_context.h>
#include <asm/watch.h>
#include <asm/types.h>
+#include <asm/stacktrace.h>
extern asmlinkage void handle_int(void);
extern asmlinkage void handle_tlbm(void);
@@ -92,16 +93,14 @@
}
#ifdef CONFIG_KALLSYMS
-static int raw_show_trace;
+int raw_show_trace;
static int __init set_raw_show_trace(char *str)
{
raw_show_trace = 1;
return 1;
}
__setup("raw_show_trace", set_raw_show_trace);
-
-extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
- unsigned long pc, unsigned long ra);
+#endif
static void show_backtrace(struct task_struct *task, struct pt_regs *regs)
{
@@ -121,9 +120,6 @@
} while (pc);
printk("\n");
}
-#else
-#define show_backtrace(task, r) show_raw_backtrace((r)->regs[29]);
-#endif
/*
* This routine abuses get_user()/put_user() to reference pointers
@@ -158,28 +154,6 @@
show_backtrace(task, regs);
}
-static __always_inline void prepare_frametrace(struct pt_regs *regs)
-{
- __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");
-}
-
void show_stack(struct task_struct *task, unsigned long *sp)
{
struct pt_regs regs;
@@ -206,11 +180,6 @@
{
struct pt_regs regs;
- /*
- * Remove any garbage that may be in regs (specially func
- * addresses) to avoid show_raw_backtrace() to report them
- */
- memset(®s, 0, sizeof(regs));
prepare_frametrace(®s);
show_backtrace(current, ®s);
}
