| Michal Simek | 2fd7c76 | 2009-11-16 09:40:14 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * Low-level ftrace handling |
| 3 | * |
| 4 | * Copyright (C) 2009 Michal Simek <monstr@monstr.eu> |
| 5 | * Copyright (C) 2009 PetaLogix |
| 6 | * |
| 7 | * This file is subject to the terms and conditions of the GNU General |
| 8 | * Public License. See the file COPYING in the main directory of this |
| 9 | * archive for more details. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/linkage.h> |
| 13 | |
| 14 | #define NOALIGN_ENTRY(name) .globl name; name: |
| 15 | |
| 16 | /* FIXME MS: I think that I don't need to save all regs */ |
| 17 | #define SAVE_REGS \ |
| 18 | addik r1, r1, -120; \ |
| 19 | swi r2, r1, 4; \ |
| 20 | swi r3, r1, 8; \ |
| 21 | swi r4, r1, 12; \ |
| 22 | swi r5, r1, 116; \ |
| 23 | swi r6, r1, 16; \ |
| 24 | swi r7, r1, 20; \ |
| 25 | swi r8, r1, 24; \ |
| 26 | swi r9, r1, 28; \ |
| 27 | swi r10, r1, 32; \ |
| 28 | swi r11, r1, 36; \ |
| 29 | swi r12, r1, 40; \ |
| 30 | swi r13, r1, 44; \ |
| 31 | swi r14, r1, 48; \ |
| 32 | swi r16, r1, 52; \ |
| 33 | swi r17, r1, 56; \ |
| 34 | swi r18, r1, 60; \ |
| 35 | swi r19, r1, 64; \ |
| 36 | swi r20, r1, 68; \ |
| 37 | swi r21, r1, 72; \ |
| 38 | swi r22, r1, 76; \ |
| 39 | swi r23, r1, 80; \ |
| 40 | swi r24, r1, 84; \ |
| 41 | swi r25, r1, 88; \ |
| 42 | swi r26, r1, 92; \ |
| 43 | swi r27, r1, 96; \ |
| 44 | swi r28, r1, 100; \ |
| 45 | swi r29, r1, 104; \ |
| 46 | swi r30, r1, 108; \ |
| 47 | swi r31, r1, 112; |
| 48 | |
| 49 | #define RESTORE_REGS \ |
| 50 | lwi r2, r1, 4; \ |
| 51 | lwi r3, r1, 8; \ |
| 52 | lwi r4, r1, 12; \ |
| 53 | lwi r5, r1, 116; \ |
| 54 | lwi r6, r1, 16; \ |
| 55 | lwi r7, r1, 20; \ |
| 56 | lwi r8, r1, 24; \ |
| 57 | lwi r9, r1, 28; \ |
| 58 | lwi r10, r1, 32; \ |
| 59 | lwi r11, r1, 36; \ |
| 60 | lwi r12, r1, 40; \ |
| 61 | lwi r13, r1, 44; \ |
| 62 | lwi r14, r1, 48; \ |
| 63 | lwi r16, r1, 52; \ |
| 64 | lwi r17, r1, 56; \ |
| 65 | lwi r18, r1, 60; \ |
| 66 | lwi r19, r1, 64; \ |
| 67 | lwi r20, r1, 68; \ |
| 68 | lwi r21, r1, 72; \ |
| 69 | lwi r22, r1, 76; \ |
| 70 | lwi r23, r1, 80; \ |
| 71 | lwi r24, r1, 84; \ |
| 72 | lwi r25, r1, 88; \ |
| 73 | lwi r26, r1, 92; \ |
| 74 | lwi r27, r1, 96; \ |
| 75 | lwi r28, r1, 100; \ |
| 76 | lwi r29, r1, 104; \ |
| 77 | lwi r30, r1, 108; \ |
| 78 | lwi r31, r1, 112; \ |
| 79 | addik r1, r1, 120; |
| 80 | |
| 81 | ENTRY(ftrace_stub) |
| 82 | rtsd r15, 8; |
| 83 | nop; |
| 84 | |
| 85 | ENTRY(_mcount) |
| 86 | SAVE_REGS |
| 87 | swi r15, r1, 0; |
| 88 | /* MS: test function trace if is taken or not */ |
| 89 | lwi r20, r0, ftrace_trace_function; |
| 90 | addik r6, r0, ftrace_stub; |
| 91 | cmpu r5, r20, r6; /* ftrace_trace_function != ftrace_stub */ |
| 92 | beqid r5, end; /* MS: not taken -> jump over */ |
| 93 | nop; |
| 94 | /* static normal trace */ |
| 95 | lwi r6, r1, 120; /* MS: load parent addr */ |
| 96 | addik r5, r15, 0; /* MS: load current function addr */ |
| 97 | /* MS: here is dependency on previous code */ |
| 98 | brald r15, r20; /* MS: jump to ftrace handler */ |
| 99 | nop; |
| 100 | end: |
| 101 | lwi r15, r1, 0; |
| 102 | RESTORE_REGS |
| 103 | |
| 104 | rtsd r15, 8; /* MS: jump back */ |
| 105 | nop; |