| | 1 | /* |
| | 2 | * Copyright IBM Corp. 2008, 2009 |
| | 3 | * |
| | 4 | * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>, |
| | 5 | * |
| | 6 | */ |
| | 7 | |
| | 8 | #include <linux/linkage.h> |
| | 9 | #include <asm/asm-offsets.h> |
| | 10 | #include <asm/ftrace.h> |
| | 11 | |
| | 12 | .section .kprobes.text, "ax" |
| | 13 | |
| | 14 | ENTRY(ftrace_stub) |
| | 15 | br %r14 |
| | 16 | |
| | 17 | ENTRY(_mcount) |
| | 18 | #ifdef CONFIG_DYNAMIC_FTRACE |
| | 19 | br %r14 |
| | 20 | |
| | 21 | ENTRY(ftrace_caller) |
| | 22 | #endif |
| | 23 | stm %r2,%r5,16(%r15) |
| | 24 | bras %r1,1f |
| | 25 | 0: .long ftrace_trace_function |
| | 26 | 1: st %r14,56(%r15) |
| | 27 | lr %r0,%r15 |
| | 28 | ahi %r15,-96 |
| | 29 | l %r3,100(%r15) |
| | 30 | la %r2,0(%r14) |
| | 31 | st %r0,__SF_BACKCHAIN(%r15) |
| | 32 | la %r3,0(%r3) |
| | 33 | ahi %r2,-MCOUNT_INSN_SIZE |
| | 34 | l %r14,0b-0b(%r1) |
| | 35 | l %r14,0(%r14) |
| | 36 | basr %r14,%r14 |
| | 37 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| | 38 | l %r2,100(%r15) |
| | 39 | l %r3,152(%r15) |
| | 40 | ENTRY(ftrace_graph_caller) |
| | 41 | # The bras instruction gets runtime patched to call prepare_ftrace_return. |
| | 42 | # See ftrace_enable_ftrace_graph_caller. The patched instruction is: |
| | 43 | # bras %r14,prepare_ftrace_return |
| | 44 | bras %r14,0f |
| | 45 | 0: st %r2,100(%r15) |
| | 46 | #endif |
| | 47 | ahi %r15,96 |
| | 48 | l %r14,56(%r15) |
| | 49 | lm %r2,%r5,16(%r15) |
| | 50 | br %r14 |
| | 51 | |
| | 52 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| | 53 | |
| | 54 | ENTRY(return_to_handler) |
| | 55 | stm %r2,%r5,16(%r15) |
| | 56 | st %r14,56(%r15) |
| | 57 | lr %r0,%r15 |
| | 58 | ahi %r15,-96 |
| | 59 | st %r0,__SF_BACKCHAIN(%r15) |
| | 60 | bras %r1,0f |
| | 61 | .long ftrace_return_to_handler |
| | 62 | 0: l %r2,0b-0b(%r1) |
| | 63 | basr %r14,%r2 |
| | 64 | lr %r14,%r2 |
| | 65 | ahi %r15,96 |
| | 66 | lm %r2,%r5,16(%r15) |
| | 67 | br %r14 |
| | 68 | |
| | 69 | #endif |
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