Commit 1df0f0ff authored by Atsushi Nemoto's avatar Atsushi Nemoto Committed by Ralf Baechle
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[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: default avatarAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent eae6c0da
......@@ -1841,6 +1841,14 @@ config RWSEM_GENERIC_SPINLOCK
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)"
......
......@@ -11,6 +11,7 @@ obj-y += cpu-probe.o branch.o entry.o genex.o irq.o process.o \
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
......
......@@ -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);
......
/*
* 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;
}
}
......@@ -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 @@ static void show_raw_backtrace(unsigned long reg29)
}
#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 @@ static void show_backtrace(struct task_struct *task, struct pt_regs *regs)
} 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 @@ static void show_stacktrace(struct task_struct *task, struct pt_regs *regs)
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 @@ void dump_stack(void)
{
struct pt_regs regs;
/*
* Remove any garbage that may be in regs (specially func
* addresses) to avoid show_raw_backtrace() to report them
*/
memset(&regs, 0, sizeof(regs));
prepare_frametrace(&regs);
show_backtrace(current, &regs);
}
......
#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 */
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