| Heiko Carstens | 5d360a7 | 2008-12-25 13:38:56 +0100 | [diff] [blame] | 1 | /* |
| Heiko Carstens | a53c8fa | 2012-07-20 11:15:04 +0200 | [diff] [blame] | 2 | * Copyright IBM Corp. 2008, 2009 |
| Heiko Carstens | 5d360a7 | 2008-12-25 13:38:56 +0100 | [diff] [blame] | 3 | * |
| 4 | * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>, |
| 5 | * |
| 6 | */ |
| 7 | |
| Jan Glauber | 144d634 | 2011-07-24 10:48:19 +0200 | [diff] [blame] | 8 | #include <linux/linkage.h> |
| Heiko Carstens | cf08734 | 2009-03-18 13:27:34 +0100 | [diff] [blame] | 9 | #include <asm/asm-offsets.h> |
| 10 | |
| Martin Schwidefsky | 860dba4 | 2011-01-05 12:47:25 +0100 | [diff] [blame] | 11 | .section .kprobes.text, "ax" |
| 12 | |
| Jan Glauber | 144d634 | 2011-07-24 10:48:19 +0200 | [diff] [blame] | 13 | ENTRY(ftrace_stub) |
| Heiko Carstens | dfd9f7a | 2009-06-12 10:26:44 +0200 | [diff] [blame] | 14 | br %r14 |
| 15 | |
| Jan Glauber | 144d634 | 2011-07-24 10:48:19 +0200 | [diff] [blame] | 16 | ENTRY(_mcount) |
| Martin Schwidefsky | 6ac2a4d | 2009-09-11 10:28:33 +0200 | [diff] [blame] | 17 | #ifdef CONFIG_DYNAMIC_FTRACE |
| Heiko Carstens | dfd9f7a | 2009-06-12 10:26:44 +0200 | [diff] [blame] | 18 | br %r14 |
| 19 | |
| Jan Glauber | 144d634 | 2011-07-24 10:48:19 +0200 | [diff] [blame] | 20 | ENTRY(ftrace_caller) |
| Martin Schwidefsky | 6ac2a4d | 2009-09-11 10:28:33 +0200 | [diff] [blame] | 21 | #endif |
| Heiko Carstens | dfd9f7a | 2009-06-12 10:26:44 +0200 | [diff] [blame] | 22 | stm %r2,%r5,16(%r15) |
| Heiko Carstens | 8b4488f | 2009-06-12 10:26:45 +0200 | [diff] [blame] | 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 |
| Heiko Carstens | dfd9f7a | 2009-06-12 10:26:44 +0200 | [diff] [blame] | 29 | st %r14,56(%r15) |
| Heiko Carstens | 8b4488f | 2009-06-12 10:26:45 +0200 | [diff] [blame] | 30 | lr %r0,%r15 |
| Heiko Carstens | dfd9f7a | 2009-06-12 10:26:44 +0200 | [diff] [blame] | 31 | ahi %r15,-96 |
| 32 | l %r3,100(%r15) |
| 33 | la %r2,0(%r14) |
| Heiko Carstens | 8b4488f | 2009-06-12 10:26:45 +0200 | [diff] [blame] | 34 | st %r0,__SF_BACKCHAIN(%r15) |
| Heiko Carstens | dfd9f7a | 2009-06-12 10:26:44 +0200 | [diff] [blame] | 35 | la %r3,0(%r3) |
| Heiko Carstens | 8b4488f | 2009-06-12 10:26:45 +0200 | [diff] [blame] | 36 | l %r14,0b-0b(%r1) |
| Heiko Carstens | dfd9f7a | 2009-06-12 10:26:44 +0200 | [diff] [blame] | 37 | l %r14,0(%r14) |
| 38 | basr %r14,%r14 |
| Heiko Carstens | 88dbd20 | 2009-06-12 10:26:46 +0200 | [diff] [blame] | 39 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| Martin Schwidefsky | 4cc9bed | 2011-01-05 12:48:11 +0100 | [diff] [blame] | 40 | l %r2,100(%r15) |
| 41 | l %r3,152(%r15) |
| Jan Glauber | 144d634 | 2011-07-24 10:48:19 +0200 | [diff] [blame] | 42 | ENTRY(ftrace_graph_caller) |
| Martin Schwidefsky | 4cc9bed | 2011-01-05 12:48:11 +0100 | [diff] [blame] | 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) |
| Heiko Carstens | 88dbd20 | 2009-06-12 10:26:46 +0200 | [diff] [blame] | 48 | #endif |
| Heiko Carstens | dfd9f7a | 2009-06-12 10:26:44 +0200 | [diff] [blame] | 49 | ahi %r15,96 |
| Heiko Carstens | dfd9f7a | 2009-06-12 10:26:44 +0200 | [diff] [blame] | 50 | l %r14,56(%r15) |
| Heiko Carstens | 8b4488f | 2009-06-12 10:26:45 +0200 | [diff] [blame] | 51 | 3: lm %r2,%r5,16(%r15) |
| Heiko Carstens | dfd9f7a | 2009-06-12 10:26:44 +0200 | [diff] [blame] | 52 | br %r14 |
| 53 | |
| Heiko Carstens | 88dbd20 | 2009-06-12 10:26:46 +0200 | [diff] [blame] | 54 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 55 | |
| Jan Glauber | 144d634 | 2011-07-24 10:48:19 +0200 | [diff] [blame] | 56 | ENTRY(return_to_handler) |
| Heiko Carstens | 88dbd20 | 2009-06-12 10:26:46 +0200 | [diff] [blame] | 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 | |
| Martin Schwidefsky | 6ac2a4d | 2009-09-11 10:28:33 +0200 | [diff] [blame] | 71 | #endif |