Commit 3e4196a5 authored by Max Filippov's avatar Max Filippov Committed by Chris Zankel
Browse files

xtensa: add stacktrace support



Signed-off-by: default avatarMax Filippov <jcmvbkbc@gmail.com>
Signed-off-by: default avatarChris Zankel <chris@zankel.net>
parent 4e96274e
......@@ -52,6 +52,9 @@ config HZ
source "init/Kconfig"
source "kernel/Kconfig.freezer"
config STACKTRACE_SUPPORT
def_bool y
config MMU
def_bool n
......
/*
* arch/xtensa/include/asm/stacktrace.h
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2001 - 2013 Tensilica Inc.
*/
#ifndef _XTENSA_STACKTRACE_H
#define _XTENSA_STACKTRACE_H
#include <linux/sched.h>
struct stackframe {
unsigned long pc;
unsigned long sp;
};
static __always_inline unsigned long *stack_pointer(struct task_struct *task)
{
unsigned long *sp;
if (!task || task == current)
__asm__ __volatile__ ("mov %0, a1\n" : "=a"(sp));
else
sp = (unsigned long *)task->thread.sp;
return sp;
}
void walk_stackframe(unsigned long *sp,
int (*fn)(struct stackframe *frame, void *data),
void *data);
#endif /* _XTENSA_STACKTRACE_H */
......@@ -4,9 +4,9 @@
extra-y := head.o vmlinux.lds
obj-y := align.o entry.o irq.o coprocessor.o process.o ptrace.o \
setup.o signal.o syscall.o time.o traps.o vectors.o platform.o \
pci-dma.o
obj-y := align.o coprocessor.o entry.o irq.o pci-dma.o platform.o process.o \
ptrace.o setup.o signal.o stacktrace.o syscall.o time.o traps.o \
vectors.o
obj-$(CONFIG_KGDB) += xtensa-stub.o
obj-$(CONFIG_PCI) += pci.o
......
/*
* arch/xtensa/kernel/stacktrace.c
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2001 - 2013 Tensilica Inc.
*/
#include <linux/export.h>
#include <linux/sched.h>
#include <linux/stacktrace.h>
#include <asm/stacktrace.h>
#include <asm/traps.h>
void walk_stackframe(unsigned long *sp,
int (*fn)(struct stackframe *frame, void *data),
void *data)
{
unsigned long a0, a1;
unsigned long sp_end;
a1 = (unsigned long)sp;
sp_end = ALIGN(a1, THREAD_SIZE);
spill_registers();
while (a1 < sp_end) {
struct stackframe frame;
sp = (unsigned long *)a1;
a0 = *(sp - 4);
a1 = *(sp - 3);
if (a1 <= (unsigned long)sp)
break;
frame.pc = MAKE_PC_FROM_RA(a0, a1);
frame.sp = a1;
if (fn(&frame, data))
return;
}
}
#ifdef CONFIG_STACKTRACE
struct stack_trace_data {
struct stack_trace *trace;
unsigned skip;
};
static int stack_trace_cb(struct stackframe *frame, void *data)
{
struct stack_trace_data *trace_data = data;
struct stack_trace *trace = trace_data->trace;
if (trace_data->skip) {
--trace_data->skip;
return 0;
}
if (!kernel_text_address(frame->pc))
return 0;
trace->entries[trace->nr_entries++] = frame->pc;
return trace->nr_entries >= trace->max_entries;
}
void save_stack_trace_tsk(struct task_struct *task, struct stack_trace *trace)
{
struct stack_trace_data trace_data = {
.trace = trace,
.skip = trace->skip,
};
walk_stackframe(stack_pointer(task), stack_trace_cb, &trace_data);
}
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
void save_stack_trace(struct stack_trace *trace)
{
save_stack_trace_tsk(current, trace);
}
EXPORT_SYMBOL_GPL(save_stack_trace);
#endif
......@@ -11,7 +11,7 @@
*
* Essentially rewritten for the Xtensa architecture port.
*
* Copyright (C) 2001 - 2005 Tensilica Inc.
* Copyright (C) 2001 - 2013 Tensilica Inc.
*
* Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
* Chris Zankel <chris@zankel.net>
......@@ -32,6 +32,7 @@
#include <linux/delay.h>
#include <linux/hardirq.h>
#include <asm/stacktrace.h>
#include <asm/ptrace.h>
#include <asm/timex.h>
#include <asm/uaccess.h>
......@@ -402,53 +403,25 @@ void show_regs(struct pt_regs * regs)
regs->syscall);
}
static __always_inline unsigned long *stack_pointer(struct task_struct *task)
static int show_trace_cb(struct stackframe *frame, void *data)
{
unsigned long *sp;
if (!task || task == current)
__asm__ __volatile__ ("mov %0, a1\n" : "=a"(sp));
else
sp = (unsigned long *)task->thread.sp;
return sp;
if (kernel_text_address(frame->pc)) {
printk(" [<%08lx>] ", frame->pc);
print_symbol("%s\n", frame->pc);
}
return 0;
}
void show_trace(struct task_struct *task, unsigned long *sp)
{
unsigned long a0, a1, pc;
unsigned long sp_start, sp_end;
if (sp)
a1 = (unsigned long)sp;
else
a1 = (unsigned long)stack_pointer(task);
sp_start = a1 & ~(THREAD_SIZE-1);
sp_end = sp_start + THREAD_SIZE;
if (!sp)
sp = stack_pointer(task);
printk("Call Trace:");
#ifdef CONFIG_KALLSYMS
printk("\n");
#endif
spill_registers();
while (a1 > sp_start && a1 < sp_end) {
sp = (unsigned long*)a1;
a0 = *(sp - 4);
a1 = *(sp - 3);
if (a1 <= (unsigned long) sp)
break;
pc = MAKE_PC_FROM_RA(a0, a1);
if (kernel_text_address(pc)) {
printk(" [<%08lx>] ", pc);
print_symbol("%s\n", pc);
}
}
walk_stackframe(sp, show_trace_cb, NULL);
printk("\n");
}
......
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