blob: 4a6e1a575f9eb6bdf360e0008730a86f267c315b [file] [log] [blame]
Heiko Carstens5d360a72008-12-25 13:38:56 +01001/*
Heiko Carstensdfd9f7a2009-06-12 10:26:44 +02002 * Copyright IBM Corp. 2008,2009
Heiko Carstens5d360a72008-12-25 13:38:56 +01003 *
4 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
5 *
6 */
7
Heiko Carstenscf087342009-03-18 13:27:34 +01008#include <asm/asm-offsets.h>
9
Martin Schwidefsky860dba42011-01-05 12:47:25 +010010 .section .kprobes.text, "ax"
11
Heiko Carstensdfd9f7a2009-06-12 10:26:44 +020012 .globl ftrace_stub
13ftrace_stub:
14 br %r14
15
Heiko Carstensdfd9f7a2009-06-12 10:26:44 +020016 .globl _mcount
Heiko Carstens5d360a72008-12-25 13:38:56 +010017_mcount:
Martin Schwidefsky6ac2a4d2009-09-11 10:28:33 +020018#ifdef CONFIG_DYNAMIC_FTRACE
Heiko Carstensdfd9f7a2009-06-12 10:26:44 +020019 br %r14
20
21 .data
22 .globl ftrace_dyn_func
23ftrace_dyn_func:
Martin Schwidefsky6ac2a4d2009-09-11 10:28:33 +020024 .long ftrace_stub
Heiko Carstensdfd9f7a2009-06-12 10:26:44 +020025 .previous
26
Heiko Carstensdfd9f7a2009-06-12 10:26:44 +020027 .globl ftrace_caller
28ftrace_caller:
Martin Schwidefsky6ac2a4d2009-09-11 10:28:33 +020029#endif
Heiko Carstensdfd9f7a2009-06-12 10:26:44 +020030 stm %r2,%r5,16(%r15)
Heiko Carstens8b4488f2009-06-12 10:26:45 +020031 bras %r1,2f
Martin Schwidefsky6ac2a4d2009-09-11 10:28:33 +020032#ifdef CONFIG_DYNAMIC_FTRACE
330: .long ftrace_dyn_func
34#else
Heiko Carstens8b4488f2009-06-12 10:26:45 +0200350: .long ftrace_trace_function
Martin Schwidefsky6ac2a4d2009-09-11 10:28:33 +020036#endif
Heiko Carstens8b4488f2009-06-12 10:26:45 +0200371: .long function_trace_stop
382: l %r2,1b-0b(%r1)
39 icm %r2,0xf,0(%r2)
40 jnz 3f
Heiko Carstensdfd9f7a2009-06-12 10:26:44 +020041 st %r14,56(%r15)
Heiko Carstens8b4488f2009-06-12 10:26:45 +020042 lr %r0,%r15
Heiko Carstensdfd9f7a2009-06-12 10:26:44 +020043 ahi %r15,-96
44 l %r3,100(%r15)
45 la %r2,0(%r14)
Heiko Carstens8b4488f2009-06-12 10:26:45 +020046 st %r0,__SF_BACKCHAIN(%r15)
Heiko Carstensdfd9f7a2009-06-12 10:26:44 +020047 la %r3,0(%r3)
Heiko Carstens8b4488f2009-06-12 10:26:45 +020048 l %r14,0b-0b(%r1)
Heiko Carstensdfd9f7a2009-06-12 10:26:44 +020049 l %r14,0(%r14)
50 basr %r14,%r14
Heiko Carstens88dbd202009-06-12 10:26:46 +020051#ifdef CONFIG_FUNCTION_GRAPH_TRACER
Martin Schwidefsky6ac2a4d2009-09-11 10:28:33 +020052#ifdef CONFIG_DYNAMIC_FTRACE
Heiko Carstens88dbd202009-06-12 10:26:46 +020053 .globl ftrace_graph_caller
54ftrace_graph_caller:
55 # This unconditional branch gets runtime patched. Change only if
56 # you know what you are doing. See ftrace_enable_graph_caller().
57 j 1f
Martin Schwidefsky6ac2a4d2009-09-11 10:28:33 +020058#endif
Heiko Carstens88dbd202009-06-12 10:26:46 +020059 bras %r1,0f
60 .long prepare_ftrace_return
610: l %r2,152(%r15)
62 l %r4,0(%r1)
63 l %r3,100(%r15)
64 basr %r14,%r4
65 st %r2,100(%r15)
661:
67#endif
Heiko Carstensdfd9f7a2009-06-12 10:26:44 +020068 ahi %r15,96
Heiko Carstensdfd9f7a2009-06-12 10:26:44 +020069 l %r14,56(%r15)
Heiko Carstens8b4488f2009-06-12 10:26:45 +0200703: lm %r2,%r5,16(%r15)
Heiko Carstensdfd9f7a2009-06-12 10:26:44 +020071 br %r14
72
Heiko Carstens88dbd202009-06-12 10:26:46 +020073#ifdef CONFIG_FUNCTION_GRAPH_TRACER
74
75 .globl return_to_handler
76return_to_handler:
77 stm %r2,%r5,16(%r15)
78 st %r14,56(%r15)
79 lr %r0,%r15
80 ahi %r15,-96
81 st %r0,__SF_BACKCHAIN(%r15)
82 bras %r1,0f
83 .long ftrace_return_to_handler
840: l %r2,0b-0b(%r1)
85 basr %r14,%r2
86 lr %r14,%r2
87 ahi %r15,96
88 lm %r2,%r5,16(%r15)
89 br %r14
90
Martin Schwidefsky6ac2a4d2009-09-11 10:28:33 +020091#endif