lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

sh: Use the generalized stacktrace ops

Browse Source 
Copy the stacktrace ops code from x86 and provide a central function for
use by functions that need to dump a callstack.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Matt Fleming
2009-08-07 16:11:19 +01:00
committed by Paul Mundt
parent 922b0dc59b
commit 4e14dfc722
6 changed files with 251 additions and 71 deletions
Download Patch File Download Diff File Expand all files Collapse all files

56
arch/sh/oprofile/backtrace.c
View File

@@ -20,6 +20,39 @@
#include <asm/ptrace.h>
#include <asm/uaccess.h>
#include <asm/sections.h>
#include <asm/stacktrace.h>
static void backtrace_warning_symbol(void *data, char *msg,
unsigned long symbol)
{
/* Ignore warnings */
}
static void backtrace_warning(void *data, char *msg)
{
/* Ignore warnings */
}
static int backtrace_stack(void *data, char *name)
{
/* Yes, we want all stacks */
return 0;
}
static void backtrace_address(void *data, unsigned long addr, int reliable)
{
unsigned int *depth = data;
if ((*depth)--)
oprofile_add_trace(addr);
}
static struct stacktrace_ops backtrace_ops = {
.warning = backtrace_warning,
.warning_symbol = backtrace_warning_symbol,
.stack = backtrace_stack,
.address = backtrace_address,
};
/* Limit to stop backtracing too far. */
static int backtrace_limit = 20;
@@ -74,23 +107,6 @@ static int valid_kernel_stack(unsigned long *stackaddr, struct pt_regs *regs)
return ((unsigned long)stackaddr > stack) && ((unsigned long)stackaddr < stack_base);
}
static unsigned long *
kernel_backtrace(unsigned long *stackaddr, struct pt_regs *regs)
{
unsigned long addr;
/*
* If not a valid kernel address, keep going till we find one
* or the SP stops being a valid address.
*/
do {
addr = *stackaddr++;
oprofile_add_trace(addr);
} while (valid_kernel_stack(stackaddr, regs));
return stackaddr;
}
void sh_backtrace(struct pt_regs * const regs, unsigned int depth)
{
unsigned long *stackaddr;
@@ -103,9 +119,9 @@ void sh_backtrace(struct pt_regs * const regs, unsigned int depth)
stackaddr = (unsigned long *)regs->regs[15];
if (!user_mode(regs)) {
while (depth-- && valid_kernel_stack(stackaddr, regs))
stackaddr = kernel_backtrace(stackaddr, regs);
if (depth)
dump_trace(NULL, regs, stackaddr,
&backtrace_ops, &depth);
return;
}