| Matt Fleming | fad57fe | 2008-11-12 20:11:47 +0900 | [diff] [blame] | 1 | /* |
| 2 | * arch/sh/lib/mcount.S |
| 3 | * |
| 4 | * Copyright (C) 2008 Paul Mundt |
| 5 | * Copyright (C) 2008 Matt Fleming |
| 6 | * |
| 7 | * This file is subject to the terms and conditions of the GNU General Public |
| 8 | * License. See the file "COPYING" in the main directory of this archive |
| 9 | * for more details. |
| 10 | */ |
| 11 | #include <asm/ftrace.h> |
| 12 | |
| 13 | #define MCOUNT_ENTER() \ |
| 14 | mov.l r4, @-r15; \ |
| 15 | mov.l r5, @-r15; \ |
| 16 | mov.l r6, @-r15; \ |
| 17 | mov.l r7, @-r15; \ |
| 18 | sts.l pr, @-r15; \ |
| 19 | \ |
| 20 | mov.l @(20,r15),r4; \ |
| 21 | sts pr, r5 |
| 22 | |
| 23 | #define MCOUNT_LEAVE() \ |
| 24 | lds.l @r15+, pr; \ |
| 25 | mov.l @r15+, r7; \ |
| 26 | mov.l @r15+, r6; \ |
| 27 | mov.l @r15+, r5; \ |
| 28 | rts; \ |
| 29 | mov.l @r15+, r4 |
| 30 | |
| 31 | .align 2 |
| 32 | .globl _mcount |
| 33 | .type _mcount,@function |
| 34 | .globl mcount |
| 35 | .type mcount,@function |
| 36 | _mcount: |
| 37 | mcount: |
| 38 | MCOUNT_ENTER() |
| 39 | |
| 40 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 41 | .globl mcount_call |
| 42 | mcount_call: |
| 43 | mov.l .Lftrace_stub, r6 |
| 44 | #else |
| 45 | mov.l .Lftrace_trace_function, r6 |
| 46 | mov.l ftrace_stub, r7 |
| 47 | cmp/eq r6, r7 |
| 48 | bt skip_trace |
| 49 | mov.l @r6, r6 |
| 50 | #endif |
| 51 | |
| 52 | jsr @r6 |
| 53 | nop |
| 54 | |
| 55 | skip_trace: |
| 56 | MCOUNT_LEAVE() |
| 57 | |
| 58 | .align 2 |
| 59 | .Lftrace_trace_function: |
| 60 | .long ftrace_trace_function |
| 61 | |
| 62 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 63 | .globl ftrace_caller |
| 64 | ftrace_caller: |
| 65 | MCOUNT_ENTER() |
| 66 | |
| 67 | .globl ftrace_call |
| 68 | ftrace_call: |
| 69 | mov.l .Lftrace_stub, r6 |
| 70 | jsr @r6 |
| 71 | nop |
| 72 | |
| 73 | MCOUNT_LEAVE() |
| 74 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
| 75 | |
| 76 | /* |
| 77 | * NOTE: From here on the locations of the .Lftrace_stub label and |
| 78 | * ftrace_stub itself are fixed. Adding additional data here will skew |
| 79 | * the displacement for the memory table and break the block replacement. |
| 80 | * Place new labels either after the ftrace_stub body, or before |
| 81 | * ftrace_caller. You have been warned. |
| 82 | */ |
| 83 | .align 2 |
| 84 | .Lftrace_stub: |
| 85 | .long ftrace_stub |
| 86 | |
| 87 | .globl ftrace_stub |
| 88 | ftrace_stub: |
| 89 | rts |
| 90 | nop |