projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 5d360a75 | 1 | /* |
| dfd9f7ab | 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 |