xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

um: Rewrite show_stack()

Browse Source 
Currently on UML stack traces are not very reliable and both
x86 and x86_64 have their on implementations.
This patch unifies both and adds support to outline unreliable
functions calls.

Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Richard Weinberger
2013-09-23 17:38:01 +02:00
parent 5e01dc7b26
commit 9d1ee8ce92
6 changed files with 64 additions and 106 deletions
Download Patch File Download Diff File Expand all files Collapse all files

85
arch/um/kernel/sysrq.c
View File

@@ -1,6 +1,10 @@
/*
* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
* Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
*
* 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>
@@ -9,58 +13,75 @@
#include <linux/sched.h>
#include <asm/sysrq.h>
/* Catch non-i386 SUBARCH's. */
#if !defined(CONFIG_UML_X86) || defined(CONFIG_64BIT)
void show_trace(struct task_struct *task, unsigned long * stack)
struct stack_frame {
struct stack_frame *next_frame;
unsigned long return_address;
};
static void print_stack_trace(unsigned long *sp, unsigned long bp)
{
int reliable;
unsigned long addr;
struct stack_frame *frame = (struct stack_frame *)bp;
if (!stack) {
stack = (unsigned long*) &stack;
WARN_ON(1);
}
printk(KERN_INFO "Call Trace: \n");
while (((long) stack & (THREAD_SIZE-1)) != 0) {
addr = *stack;
printk(KERN_INFO "Call Trace:\n");
while (((long) sp & (THREAD_SIZE-1)) != 0) {
addr = *sp;
if (__kernel_text_address(addr)) {
printk(KERN_INFO "%08lx: [<%08lx>]",
(unsigned long) stack, addr);
print_symbol(KERN_CONT " %s", 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");
}
stack++;
sp++;
}
printk(KERN_INFO "\n");
}
#endif
/*Stolen from arch/i386/kernel/traps.c */
static const int kstack_depth_to_print = 24;
/* This recently started being used in arch-independent code too, as in
* kernel/sched/core.c.*/
void show_stack(struct task_struct *task, unsigned long *esp)
static unsigned long get_frame_pointer(struct task_struct *task)
{
unsigned long *stack;
if (!task || task == current)
return current_bp();
else
return KSTK_EBP(task);
}
void show_stack(struct task_struct *task, unsigned long *stack)
{
unsigned long *sp = stack, bp = 0;
int i;
if (esp == NULL) {
if (task != current && task != NULL) {
esp = (unsigned long *) KSTK_ESP(task);
} else {
esp = (unsigned long *) &esp;
}
#ifdef CONFIG_FRAME_POINTER
bp = get_frame_pointer(task);
#endif
if (!stack) {
if (!task || task == current)
sp = current_sp();
else
sp = (unsigned long *)KSTK_ESP(task);
}
stack = esp;
printk(KERN_INFO "Stack:\n");
stack = sp;
for (i = 0; i < kstack_depth_to_print; i++) {
if (kstack_end(stack))
break;
if (i && ((i % 8) == 0))
printk(KERN_INFO " ");
printk(KERN_CONT "%08lx ", *stack++);
if (i && ((i % STACKSLOTS_PER_LINE) == 0))
printk(KERN_CONT "\n");
printk(KERN_CONT " %08lx", *stack++);
}
printk(KERN_CONT "\n");
show_trace(task, esp);
print_stack_trace(sp, bp);
}