Commit 970e51fe authored by Daniel Walter's avatar Daniel Walter Committed by Richard Weinberger

um: Add support for CONFIG_STACKTRACE

Add stacktrace support for User Mode Linux
Signed-off-by: default avatarDaniel Walter <dwalter@google.com>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent 2a236122
...@@ -39,7 +39,8 @@ config LOCKDEP_SUPPORT ...@@ -39,7 +39,8 @@ config LOCKDEP_SUPPORT
config STACKTRACE_SUPPORT config STACKTRACE_SUPPORT
bool bool
default n default y
select STACKTRACE
config GENERIC_CALIBRATE_DELAY config GENERIC_CALIBRATE_DELAY
bool bool
......
#ifndef _ASM_UML_STACKTRACE_H
#define _ASM_UML_STACKTRACE_H
#include <linux/uaccess.h>
#include <linux/ptrace.h>
struct stack_frame {
struct stack_frame *next_frame;
unsigned long return_address;
};
struct stacktrace_ops {
void (*address)(void *data, unsigned long address, int reliable);
};
#ifdef CONFIG_FRAME_POINTER
static inline unsigned long
get_frame_pointer(struct task_struct *task, struct pt_regs *segv_regs)
{
if (!task || task == current)
return segv_regs ? PT_REGS_BP(segv_regs) : current_bp();
return KSTK_EBP(task);
}
#else
static inline unsigned long
get_frame_pointer(struct task_struct *task, struct pt_regs *segv_regs)
{
return 0;
}
#endif
static inline unsigned long
*get_stack_pointer(struct task_struct *task, struct pt_regs *segv_regs)
{
if (!task || task == current)
return segv_regs ? (unsigned long *)PT_REGS_SP(segv_regs) : current_sp();
return (unsigned long *)KSTK_ESP(task);
}
void dump_trace(struct task_struct *tsk, const struct stacktrace_ops *ops, void *data);
#endif /* _ASM_UML_STACKTRACE_H */
...@@ -19,6 +19,7 @@ obj-$(CONFIG_BLK_DEV_INITRD) += initrd.o ...@@ -19,6 +19,7 @@ obj-$(CONFIG_BLK_DEV_INITRD) += initrd.o
obj-$(CONFIG_GPROF) += gprof_syms.o obj-$(CONFIG_GPROF) += gprof_syms.o
obj-$(CONFIG_GCOV) += gmon_syms.o obj-$(CONFIG_GCOV) += gmon_syms.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
USER_OBJS := config.o USER_OBJS := config.o
......
/*
* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Copyright (C) 2013 Richard Weinberger <richard@nod.at>
* Copyright (C) 2014 Google Inc., Author: Daniel Walter <dwalter@google.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kallsyms.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/stacktrace.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <asm/stacktrace.h>
void dump_trace(struct task_struct *tsk,
const struct stacktrace_ops *ops,
void *data)
{
int reliable = 0;
unsigned long *sp, bp, addr;
struct pt_regs *segv_regs = tsk->thread.segv_regs;
struct stack_frame *frame;
bp = get_frame_pointer(tsk, segv_regs);
sp = get_stack_pointer(tsk, segv_regs);
frame = (struct stack_frame *)bp;
while (((long) sp & (THREAD_SIZE-1)) != 0) {
addr = *sp;
if (__kernel_text_address(addr)) {
reliable = 0;
if ((unsigned long) sp == bp + sizeof(long)) {
frame = frame ? frame->next_frame : NULL;
bp = (unsigned long)frame;
reliable = 1;
}
ops->address(data, addr, reliable);
}
sp++;
}
}
static void save_addr(void *data, unsigned long address, int reliable)
{
struct stack_trace *trace = data;
if (!reliable)
return;
if (trace->nr_entries >= trace->max_entries)
return;
trace->entries[trace->nr_entries++] = address;
}
static const struct stacktrace_ops dump_ops = {
.address = save_addr
};
static void __save_stack_trace(struct task_struct *tsk, struct stack_trace *trace)
{
dump_trace(tsk, &dump_ops, trace);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
void save_stack_trace(struct stack_trace *trace)
{
__save_stack_trace(current, trace);
}
EXPORT_SYMBOL_GPL(save_stack_trace);
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
__save_stack_trace(tsk, trace);
}
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
...@@ -12,57 +12,20 @@ ...@@ -12,57 +12,20 @@
#include <linux/module.h> #include <linux/module.h>
#include <linux/sched.h> #include <linux/sched.h>
#include <asm/sysrq.h> #include <asm/sysrq.h>
#include <asm/stacktrace.h>
#include <os.h> #include <os.h>
struct stack_frame { static void _print_addr(void *data, unsigned long address, int reliable)
struct stack_frame *next_frame;
unsigned long return_address;
};
static void do_stack_trace(unsigned long *sp, unsigned long bp)
{ {
int reliable; pr_info(" [<%08lx>]", address);
unsigned long addr; pr_cont(" %s", reliable ? "" : "? ");
struct stack_frame *frame = (struct stack_frame *)bp; print_symbol("%s", address);
pr_cont("\n");
printk(KERN_INFO "Call Trace:\n");
while (((long) sp & (THREAD_SIZE-1)) != 0) {
addr = *sp;
if (__kernel_text_address(addr)) {
reliable = 0;
if ((unsigned long) sp == bp + sizeof(long)) {
frame = frame ? frame->next_frame : NULL;
bp = (unsigned long)frame;
reliable = 1;
}
printk(KERN_INFO " [<%08lx>]", addr);
printk(KERN_CONT " %s", reliable ? "" : "? ");
print_symbol(KERN_CONT "%s", addr);
printk(KERN_CONT "\n");
}
sp++;
}
printk(KERN_INFO "\n");
} }
static unsigned long get_frame_pointer(struct task_struct *task, static const struct stacktrace_ops stackops = {
struct pt_regs *segv_regs) .address = _print_addr
{ };
if (!task || task == current)
return segv_regs ? PT_REGS_BP(segv_regs) : current_bp();
else
return KSTK_EBP(task);
}
static unsigned long *get_stack_pointer(struct task_struct *task,
struct pt_regs *segv_regs)
{
if (!task || task == current)
return segv_regs ? (unsigned long *)PT_REGS_SP(segv_regs) : current_sp();
else
return (unsigned long *)KSTK_ESP(task);
}
void show_stack(struct task_struct *task, unsigned long *stack) void show_stack(struct task_struct *task, unsigned long *stack)
{ {
...@@ -71,7 +34,7 @@ void show_stack(struct task_struct *task, unsigned long *stack) ...@@ -71,7 +34,7 @@ void show_stack(struct task_struct *task, unsigned long *stack)
int i; int i;
if (!segv_regs && os_is_signal_stack()) { if (!segv_regs && os_is_signal_stack()) {
printk(KERN_ERR "Received SIGSEGV in SIGSEGV handler," pr_err("Received SIGSEGV in SIGSEGV handler,"
" aborting stack trace!\n"); " aborting stack trace!\n");
return; return;
} }
...@@ -83,16 +46,18 @@ void show_stack(struct task_struct *task, unsigned long *stack) ...@@ -83,16 +46,18 @@ void show_stack(struct task_struct *task, unsigned long *stack)
if (!stack) if (!stack)
sp = get_stack_pointer(task, segv_regs); sp = get_stack_pointer(task, segv_regs);
printk(KERN_INFO "Stack:\n"); pr_info("Stack:\n");
stack = sp; stack = sp;
for (i = 0; i < 3 * STACKSLOTS_PER_LINE; i++) { for (i = 0; i < 3 * STACKSLOTS_PER_LINE; i++) {
if (kstack_end(stack)) if (kstack_end(stack))
break; break;
if (i && ((i % STACKSLOTS_PER_LINE) == 0)) if (i && ((i % STACKSLOTS_PER_LINE) == 0))
printk(KERN_CONT "\n"); pr_cont("\n");
printk(KERN_CONT " %08lx", *stack++); pr_cont(" %08lx", *stack++);
} }
printk(KERN_CONT "\n"); pr_cont("\n");
do_stack_trace(sp, bp); pr_info("Call Trace:\n");
dump_trace(current, &stackops, NULL);
pr_info("\n");
} }
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