Commit | Line | Data |
---|---|---|
5d360a75 | 1 | /* |
a53c8fab | 2 | * Copyright IBM Corp. 2008, 2009 |
5d360a75 HC |
3 | * |
4 | * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>, | |
5 | * | |
6 | */ | |
7 | ||
144d634a | 8 | #include <linux/linkage.h> |
cf087343 HC |
9 | #include <asm/asm-offsets.h> |
10 | ||
860dba45 MS |
11 | .section .kprobes.text, "ax" |
12 | ||
144d634a | 13 | ENTRY(ftrace_stub) |
dfd9f7ab HC |
14 | br %r14 |
15 | ||
144d634a | 16 | ENTRY(_mcount) |
6ac2a4dd | 17 | #ifdef CONFIG_DYNAMIC_FTRACE |
5d360a75 HC |
18 | br %r14 |
19 | ||
144d634a | 20 | ENTRY(ftrace_caller) |
6ac2a4dd | 21 | #endif |
dfd9f7ab | 22 | stm %r2,%r5,16(%r15) |
8b4488f8 HC |
23 | bras %r1,2f |
24 | 0: .long ftrace_trace_function | |
25 | 1: .long function_trace_stop | |
26 | 2: l %r2,1b-0b(%r1) | |
27 | icm %r2,0xf,0(%r2) | |
28 | jnz 3f | |
dfd9f7ab | 29 | st %r14,56(%r15) |
8b4488f8 | 30 | lr %r0,%r15 |
dfd9f7ab HC |
31 | ahi %r15,-96 |
32 | l %r3,100(%r15) | |
33 | la %r2,0(%r14) | |
8b4488f8 | 34 | st %r0,__SF_BACKCHAIN(%r15) |
dfd9f7ab | 35 | la %r3,0(%r3) |
8b4488f8 | 36 | l %r14,0b-0b(%r1) |
dfd9f7ab HC |
37 | l %r14,0(%r14) |
38 | basr %r14,%r14 | |
88dbd203 | 39 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
4cc9bed0 MS |
40 | l %r2,100(%r15) |
41 | l %r3,152(%r15) | |
144d634a | 42 | ENTRY(ftrace_graph_caller) |
4cc9bed0 MS |
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 | |
47 | 0: st %r2,100(%r15) | |
88dbd203 | 48 | #endif |
dfd9f7ab | 49 | ahi %r15,96 |
dfd9f7ab | 50 | l %r14,56(%r15) |
8b4488f8 | 51 | 3: lm %r2,%r5,16(%r15) |
5d360a75 HC |
52 | br %r14 |
53 | ||
88dbd203 HC |
54 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
55 | ||
144d634a | 56 | ENTRY(return_to_handler) |
88dbd203 HC |
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 | |
64 | 0: 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 | ||
6ac2a4dd | 71 | #endif |