aboutsummaryrefslogtreecommitdiff
path: root/arch/sparc64/kernel/ftrace.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc64/kernel/ftrace.c')
-rw-r--r--arch/sparc64/kernel/ftrace.c94
1 files changed, 94 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/ftrace.c b/arch/sparc64/kernel/ftrace.c
new file mode 100644
index 00000000000..4298d0aee71
--- /dev/null
+++ b/arch/sparc64/kernel/ftrace.c
@@ -0,0 +1,94 @@
+#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/ftrace.h>
+
+static const u32 ftrace_nop = 0x01000000;
+
+notrace unsigned char *ftrace_nop_replace(void)
+{
+ return (char *)&ftrace_nop;
+}
+
+notrace unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr)
+{
+ static u32 call;
+ s32 off;
+
+ off = ((s32)addr - (s32)ip);
+ call = 0x40000000 | ((u32)off >> 2);
+
+ return (unsigned char *) &call;
+}
+
+notrace int
+ftrace_modify_code(unsigned long ip, unsigned char *old_code,
+ unsigned char *new_code)
+{
+ u32 old = *(u32 *)old_code;
+ u32 new = *(u32 *)new_code;
+ u32 replaced;
+ int faulted;
+
+ __asm__ __volatile__(
+ "1: cas [%[ip]], %[old], %[new]\n"
+ " flush %[ip]\n"
+ " mov 0, %[faulted]\n"
+ "2:\n"
+ " .section .fixup,#alloc,#execinstr\n"
+ " .align 4\n"
+ "3: sethi %%hi(2b), %[faulted]\n"
+ " jmpl %[faulted] + %%lo(2b), %%g0\n"
+ " mov 1, %[faulted]\n"
+ " .previous\n"
+ " .section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .word 1b, 3b\n"
+ " .previous\n"
+ : "=r" (replaced), [faulted] "=r" (faulted)
+ : [new] "0" (new), [old] "r" (old), [ip] "r" (ip)
+ : "memory");
+
+ if (replaced != old && replaced != new)
+ faulted = 2;
+
+ return faulted;
+}
+
+notrace int ftrace_update_ftrace_func(ftrace_func_t func)
+{
+ unsigned long ip = (unsigned long)(&ftrace_call);
+ unsigned char old[MCOUNT_INSN_SIZE], *new;
+
+ memcpy(old, &ftrace_call, MCOUNT_INSN_SIZE);
+ new = ftrace_call_replace(ip, (unsigned long)func);
+ return ftrace_modify_code(ip, old, new);
+}
+
+notrace int ftrace_mcount_set(unsigned long *data)
+{
+ unsigned long ip = (long)(&mcount_call);
+ unsigned long *addr = data;
+ unsigned char old[MCOUNT_INSN_SIZE], *new;
+
+ /*
+ * Replace the mcount stub with a pointer to the
+ * ip recorder function.
+ */
+ memcpy(old, &mcount_call, MCOUNT_INSN_SIZE);
+ new = ftrace_call_replace(ip, *addr);
+ *addr = ftrace_modify_code(ip, old, new);
+
+ return 0;
+}
+
+
+int __init ftrace_dyn_arch_init(void *data)
+{
+ ftrace_mcount_set(data);
+ return 0;
+}