1/*
 2 * Copyright IBM Corp. 2008,2009
 3 *
 4 *   Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
 5 *
 6 */
 7
 8#include <linux/linkage.h>
 9#include <asm/asm-offsets.h>
10
11	.section .kprobes.text, "ax"
12
13ENTRY(ftrace_stub)
14	br	%r14
15
16ENTRY(_mcount)
17#ifdef CONFIG_DYNAMIC_FTRACE
18	br	%r14
19
20ENTRY(ftrace_caller)
21#endif
22	stm	%r2,%r5,16(%r15)
23	bras	%r1,2f
240:	.long	ftrace_trace_function
251:	.long	function_trace_stop
262:	l	%r2,1b-0b(%r1)
27	icm	%r2,0xf,0(%r2)
28	jnz	3f
29	st	%r14,56(%r15)
30	lr	%r0,%r15
31	ahi	%r15,-96
32	l	%r3,100(%r15)
33	la	%r2,0(%r14)
34	st	%r0,__SF_BACKCHAIN(%r15)
35	la	%r3,0(%r3)
36	l	%r14,0b-0b(%r1)
37	l	%r14,0(%r14)
38	basr	%r14,%r14
39#ifdef CONFIG_FUNCTION_GRAPH_TRACER
40	l	%r2,100(%r15)
41	l	%r3,152(%r15)
42ENTRY(ftrace_graph_caller)
43# The bras instruction gets runtime patched to call prepare_ftrace_return.
44# See ftrace_enable_ftrace_graph_caller. The patched instruction is:
45#	bras	%r14,prepare_ftrace_return
46	bras	%r14,0f
470:	st	%r2,100(%r15)
48#endif
49	ahi	%r15,96
50	l	%r14,56(%r15)
513:	lm	%r2,%r5,16(%r15)
52	br	%r14
53
54#ifdef CONFIG_FUNCTION_GRAPH_TRACER
55
56ENTRY(return_to_handler)
57	stm	%r2,%r5,16(%r15)
58	st	%r14,56(%r15)
59	lr	%r0,%r15
60	ahi	%r15,-96
61	st	%r0,__SF_BACKCHAIN(%r15)
62	bras	%r1,0f
63	.long	ftrace_return_to_handler
640:	l	%r2,0b-0b(%r1)
65	basr	%r14,%r2
66	lr	%r14,%r2
67	ahi	%r15,96
68	lm	%r2,%r5,16(%r15)
69	br	%r14
70
71#endif