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sparc64: Add proper dynamic ftrace support.

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Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
David S. Miller
2009-06-13 01:03:24 -07:00
parent 949e82744b
commit 9be12f9b1c
4 changed files with 65 additions and 15 deletions
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2
arch/sparc/Kconfig
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@@ -37,6 +37,8 @@ config SPARC64
select HAVE_KPROBES
select HAVE_LMB
select HAVE_SYSCALL_WRAPPERS
select HAVE_DYNAMIC_FTRACE
select HAVE_FTRACE_MCOUNT_RECORD
select USE_GENERIC_SMP_HELPERS if SMP
select RTC_DRV_CMOS
select RTC_DRV_BQ4802

11
arch/sparc/include/asm/ftrace.h
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@@ -11,4 +11,15 @@ extern void _mcount(void);
#endif
#ifdef CONFIG_DYNAMIC_FTRACE
/* reloction of mcount call site is the same as the address */
static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
return addr;
}
struct dyn_arch_ftrace {
};
#endif /* CONFIG_DYNAMIC_FTRACE */
#endif /* _ASM_SPARC64_FTRACE */

47
arch/sparc/kernel/ftrace.c
View File

@@ -7,14 +7,10 @@
#include <asm/ftrace.h>
#ifdef CONFIG_DYNAMIC_FTRACE
static const u32 ftrace_nop = 0x01000000;
unsigned char *ftrace_nop_replace(void)
{
return (char *)&ftrace_nop;
}
unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr)
static u32 ftrace_call_replace(unsigned long ip, unsigned long addr)
{
static u32 call;
s32 off;
@@ -22,15 +18,11 @@ unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr)
off = ((s32)addr - (s32)ip);
call = 0x40000000 | ((u32)off >> 2);
return (unsigned char *) &call;
return call;
}
int
ftrace_modify_code(unsigned long ip, unsigned char *old_code,
unsigned char *new_code)
static int ftrace_modify_code(unsigned long ip, u32 old, u32 new)
{
u32 old = *(u32 *)old_code;
u32 new = *(u32 *)new_code;
u32 replaced;
int faulted;
@@ -59,18 +51,43 @@ ftrace_modify_code(unsigned long ip, unsigned char *old_code,
return faulted;
}
int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec, unsigned long addr)
{
unsigned long ip = rec->ip;
u32 old, new;
old = ftrace_call_replace(ip, addr);
new = ftrace_nop;
return ftrace_modify_code(ip, old, new);
}
int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
{
unsigned long ip = rec->ip;
u32 old, new;
old = ftrace_nop;
new = ftrace_call_replace(ip, addr);
return ftrace_modify_code(ip, old, new);
}
int ftrace_update_ftrace_func(ftrace_func_t func)
{
unsigned long ip = (unsigned long)(&ftrace_call);
unsigned char old[MCOUNT_INSN_SIZE], *new;
u32 old, new;
memcpy(old, &ftrace_call, MCOUNT_INSN_SIZE);
old = *(u32 *) &ftrace_call;
new = ftrace_call_replace(ip, (unsigned long)func);
return ftrace_modify_code(ip, old, new);
}
int __init ftrace_dyn_arch_init(void *data)
{
ftrace_mcount_set(data);
unsigned long *p = data;
*p = 0;
return 0;
}
#endif