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[S390] ftrace: add system call tracer support

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System call tracer support for s390.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
2009-06-12 10:26:47 +02:00
committed by Martin Schwidefsky
parent 88dbd20372
commit 9bf1226b33
7 changed files with 73 additions and 2 deletions
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56
arch/s390/kernel/ftrace.c
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@@ -12,6 +12,7 @@
#include <linux/ftrace.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <trace/syscall.h>
#include <asm/lowcore.h>
#ifdef CONFIG_DYNAMIC_FTRACE
@@ -202,3 +203,58 @@ out:
return parent;
}
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
#ifdef CONFIG_FTRACE_SYSCALLS
extern unsigned long __start_syscalls_metadata[];
extern unsigned long __stop_syscalls_metadata[];
extern unsigned int sys_call_table[];
static struct syscall_metadata **syscalls_metadata;
struct syscall_metadata *syscall_nr_to_meta(int nr)
{
if (!syscalls_metadata || nr >= NR_syscalls || nr < 0)
return NULL;
return syscalls_metadata[nr];
}
static struct syscall_metadata *find_syscall_meta(unsigned long syscall)
{
struct syscall_metadata *start;
struct syscall_metadata *stop;
char str[KSYM_SYMBOL_LEN];
start = (struct syscall_metadata *)__start_syscalls_metadata;
stop = (struct syscall_metadata *)__stop_syscalls_metadata;
kallsyms_lookup(syscall, NULL, NULL, NULL, str);
for ( ; start < stop; start++) {
if (start->name && !strcmp(start->name + 3, str + 3))
return start;
}
return NULL;
}
void arch_init_ftrace_syscalls(void)
{
struct syscall_metadata *meta;
int i;
static atomic_t refs;
if (atomic_inc_return(&refs) != 1)
goto out;
syscalls_metadata = kzalloc(sizeof(*syscalls_metadata) * NR_syscalls,
GFP_KERNEL);
if (!syscalls_metadata)
goto out;
for (i = 0; i < NR_syscalls; i++) {
meta = find_syscall_meta((unsigned long)sys_call_table[i]);
syscalls_metadata[i] = meta;
}
return;
out:
atomic_dec(&refs);
}
#endif