1/*
2 * Split from ftrace_64.S
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 */
9
10#include <linux/magic.h>
11#include <asm/ppc_asm.h>
12#include <asm/asm-offsets.h>
13#include <asm/ftrace.h>
14#include <asm/ppc-opcode.h>
15#include <asm/export.h>
16
17_GLOBAL_TOC(ftrace_caller)
18	lbz	r3, PACA_FTRACE_ENABLED(r13)
19	cmpdi	r3, 0
20	beqlr
21
22	/* Taken from output of objdump from lib64/glibc */
23	mflr	r3
24	ld	r11, 0(r1)
25	stdu	r1, -112(r1)
26	std	r3, 128(r1)
27	ld	r4, 16(r11)
28	subi	r3, r3, MCOUNT_INSN_SIZE
29.globl ftrace_call
30ftrace_call:
31	bl	ftrace_stub
32	nop
33#ifdef CONFIG_FUNCTION_GRAPH_TRACER
34.globl ftrace_graph_call
35ftrace_graph_call:
36	b	ftrace_graph_stub
37_GLOBAL(ftrace_graph_stub)
38#endif
39	ld	r0, 128(r1)
40	mtlr	r0
41	addi	r1, r1, 112
42
43_GLOBAL(ftrace_stub)
44	blr
45
46#ifdef CONFIG_FUNCTION_GRAPH_TRACER
47_GLOBAL(ftrace_graph_caller)
48	/* load r4 with local address */
49	ld	r4, 128(r1)
50	subi	r4, r4, MCOUNT_INSN_SIZE
51
52	/* Grab the LR out of the caller stack frame */
53	ld	r11, 112(r1)
54	ld	r3, 16(r11)
55
56	bl	prepare_ftrace_return
57	nop
58
59	/*
60	 * prepare_ftrace_return gives us the address we divert to.
61	 * Change the LR in the callers stack frame to this.
62	 */
63	ld	r11, 112(r1)
64	std	r3, 16(r11)
65
66	ld	r0, 128(r1)
67	mtlr	r0
68	addi	r1, r1, 112
69	blr
70#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
71