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/*
* Code for replacing ftrace calls with jumps.
*
* Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
*
* Thanks goes to Ingo Molnar, for suggesting the idea.
* Mathieu Desnoyers, for suggesting postponing the modifications.
* Arjan van de Ven, for keeping me straight, and explaining to me
* the dangers of modifying code on the run.
*/
#include <linux/spinlock.h>
#include <linux/hardirq.h>
#include <linux/ftrace.h>
#include <linux/percpu.h>
#include <linux/init.h>
#include <linux/list.h>
#include <asm/alternative.h>
#define CALL_BACK 5
/* Long is fine, even if it is only 4 bytes ;-) */
static long *ftrace_nop;
union ftrace_code_union {
char code[5];
struct {
char e8;
int offset;
} __attribute__((packed));
};
notrace int ftrace_ip_converted(unsigned long ip)
{
unsigned long save;
ip -= CALL_BACK;
save = *(long *)ip;
return save == *ftrace_nop;
}
static int notrace ftrace_calc_offset(long ip, long addr)
{
return (int)(addr - ip);
}
notrace unsigned char *ftrace_nop_replace(void)
{
return (char *)ftrace_nop;
}
notrace unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr)
{
static union ftrace_code_union calc;
calc.e8 = 0xe8;
calc.offset = ftrace_calc_offset(ip, addr);
/*
* No locking needed, this must be called via kstop_machine
* which in essence is like running on a uniprocessor machine.
*/
return calc.code;
}
notrace int
ftrace_modify_code(unsigned long ip, unsigned char *old_code,
unsigned char *new_code)
{
unsigned replaced;
unsigned old = *(unsigned *)old_code; /* 4 bytes */
unsigned new = *(unsigned *)new_code; /* 4 bytes */
unsigned char newch = new_code[4];
int faulted = 0;
/* move the IP back to the start of the call */
ip -= CALL_BACK;
/*
* Note: Due to modules and __init, code can
* disappear and change, we need to protect against faulting
* as well as code changing.
*
* No real locking needed, this code is run through
* kstop_machine.
*/
asm volatile (
"1: lock\n"
" cmpxchg %3, (%2)\n"
" jnz 2f\n"
" movb %b4, 4(%2)\n"
"2:\n"
".section .fixup, \"ax\"\n"
" movl $1, %0\n"
"3: jmp 2b\n"
".previous\n"
_ASM_EXTABLE(1b, 3b)
: "=r"(faulted), "=a"(replaced)
: "r"(ip), "r"(new), "r"(newch),
"0"(faulted), "a"(old)
: "memory");
sync_core();
if (replaced != old && replaced != new)
faulted = 2;
return faulted;
}
int __init ftrace_dyn_arch_init(void)
{
const unsigned char *const *noptable = find_nop_table();
ftrace_nop = (unsigned long *)noptable[CALL_BACK];
return 0;
}
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