summaryrefslogtreecommitdiffstats
path: root/arch/arm/kernel/entry-ftrace.S
blob: 3e7bcaca5e07d7db0e5a384bc0e4838475a0b638 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
/* SPDX-License-Identifier: GPL-2.0-only */

#include <asm/assembler.h>
#include <asm/ftrace.h>
#include <asm/unwind.h>

#include "entry-header.S"

/*
 * When compiling with -pg, gcc inserts a call to the mcount routine at the
 * start of every function.  In mcount, apart from the function's address (in
 * lr), we need to get hold of the function's caller's address.
 *
 * Newer GCCs (4.4+) solve this problem by using a version of mcount with call
 * sites like:
 *
 *	push	{lr}
 *	bl	__gnu_mcount_nc
 *
 * With these compilers, frame pointers are not necessary.
 *
 * mcount can be thought of as a function called in the middle of a subroutine
 * call.  As such, it needs to be transparent for both the caller and the
 * callee: the original lr needs to be restored when leaving mcount, and no
 * registers should be clobbered.
 *
 * When using dynamic ftrace, we patch out the mcount call by a "add sp, #4"
 * instead of the __gnu_mcount_nc call (see arch/arm/kernel/ftrace.c).
 */

.macro mcount_adjust_addr rd, rn
	bic	\rd, \rn, #1		@ clear the Thumb bit if present
	sub	\rd, \rd, #MCOUNT_INSN_SIZE
.endm

.macro __mcount suffix
	mcount_enter
	ldr_va	r2, ftrace_trace_function
	badr	r0, .Lftrace_stub
	cmp	r0, r2
	bne	1f

#ifdef CONFIG_FUNCTION_GRAPH_TRACER
	ldr_va	r2, ftrace_graph_return
	cmp	r0, r2
	bne	ftrace_graph_caller\suffix

	ldr_va	r2, ftrace_graph_entry
	mov_l	r0, ftrace_graph_entry_stub
	cmp	r0, r2
	bne	ftrace_graph_caller\suffix
#endif

	mcount_exit

1: 	mcount_get_lr	r1			@ lr of instrumented func
	mcount_adjust_addr	r0, lr		@ instrumented function
	badr	lr, 2f
	mov	pc, r2
2:	mcount_exit
.endm

#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS

.macro __ftrace_regs_caller

	str	lr, [sp, #-8]!	@ store LR as PC and make space for CPSR/OLD_R0,
				@ OLD_R0 will overwrite previous LR

	ldr	lr, [sp, #8]    @ get previous LR

	str	r0, [sp, #8]	@ write r0 as OLD_R0 over previous LR

	str	lr, [sp, #-4]!	@ store previous LR as LR

	add 	lr, sp, #16	@ move in LR the value of SP as it was
				@ before the push {lr} of the mcount mechanism

	push	{r0-r11, ip, lr}

	@ stack content at this point:
	@ 0  4          48   52       56            60   64    68       72
	@ R0 | R1 | ... | IP | SP + 4 | previous LR | LR | PSR | OLD_R0 |

	mov	r3, sp				@ struct pt_regs*

	ldr_va	r2, function_trace_op		@ pointer to the current
						@ function tracing op

	ldr	r1, [sp, #S_LR]			@ lr of instrumented func

	ldr	lr, [sp, #S_PC]			@ get LR

	mcount_adjust_addr	r0, lr		@ instrumented function

	.globl ftrace_regs_call
ftrace_regs_call:
	bl	ftrace_stub

#ifdef CONFIG_FUNCTION_GRAPH_TRACER
	.globl ftrace_graph_regs_call
ftrace_graph_regs_call:
ARM(	mov	r0, r0	)
THUMB(	nop.w		)
#endif

	@ pop saved regs
	pop	{r0-r11, ip, lr}		@ restore r0 through r12
	ldr	lr, [sp], #4			@ restore LR
	ldr	pc, [sp], #12
.endm

#ifdef CONFIG_FUNCTION_GRAPH_TRACER
.macro __ftrace_graph_regs_caller

#ifdef CONFIG_UNWINDER_FRAME_POINTER
	sub	r0, fp, #4		@ lr of instrumented routine (parent)
#else
	add	r0, sp, #S_LR
#endif

	@ called from __ftrace_regs_caller
	ldr	r1, [sp, #S_PC]		@ instrumented routine (func)
	mcount_adjust_addr	r1, r1

	mov	r2, fpreg		@ frame pointer
	add	r3, sp, #PT_REGS_SIZE
	bl	prepare_ftrace_return

	@ pop registers saved in ftrace_regs_caller
	pop	{r0-r11, ip, lr}		@ restore r0 through r12
	ldr	lr, [sp], #4			@ restore LR
	ldr	pc, [sp], #12

.endm
#endif
#endif

.macro __ftrace_caller suffix
	mcount_enter

	mcount_get_lr	r1			@ lr of instrumented func
	mcount_adjust_addr	r0, lr		@ instrumented function

#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
	ldr_va	r2, function_trace_op		@ pointer to the current
						@ function tracing op
	mov r3, #0				@ regs is NULL
#endif

	.globl ftrace_call\suffix
ftrace_call\suffix:
	bl	ftrace_stub

#ifdef CONFIG_FUNCTION_GRAPH_TRACER
	.globl ftrace_graph_call\suffix
ftrace_graph_call\suffix:
ARM(	mov	r0, r0	)
THUMB(	nop.w		)
#endif

	mcount_exit
.endm

.macro __ftrace_graph_caller
#ifdef CONFIG_UNWINDER_FRAME_POINTER
	sub	r0, fp, #4		@ &lr of instrumented routine (&parent)
#else
	add	r0, sp, #20
#endif
#ifdef CONFIG_DYNAMIC_FTRACE
	@ called from __ftrace_caller, saved in mcount_enter
	ldr	r1, [sp, #16]		@ instrumented routine (func)
	mcount_adjust_addr	r1, r1
#else
	@ called from __mcount, untouched in lr
	mcount_adjust_addr	r1, lr	@ instrumented routine (func)
#endif
	mov	r2, fpreg		@ frame pointer
	add	r3, sp, #24
	bl	prepare_ftrace_return
	mcount_exit
.endm

/*
 * __gnu_mcount_nc
 */

.macro mcount_enter
/*
 * This pad compensates for the push {lr} at the call site.  Note that we are
 * unable to unwind through a function which does not otherwise save its lr.
 */
 UNWIND(.pad	#4)
	stmdb	sp!, {r0-r3, lr}
 UNWIND(.save	{r0-r3, lr})
.endm

.macro mcount_get_lr reg
	ldr	\reg, [sp, #20]
.endm

.macro mcount_exit
	ldmia	sp!, {r0-r3}
	ldr	lr, [sp, #4]
	ldr	pc, [sp], #8
.endm

ENTRY(__gnu_mcount_nc)
UNWIND(.fnstart)
#ifdef CONFIG_DYNAMIC_FTRACE
	push	{lr}
	ldr	lr, [sp, #4]
	ldr	pc, [sp], #8
#else
	__mcount
#endif
UNWIND(.fnend)
ENDPROC(__gnu_mcount_nc)

#ifdef CONFIG_DYNAMIC_FTRACE
ENTRY(ftrace_caller)
UNWIND(.fnstart)
	__ftrace_caller
UNWIND(.fnend)
ENDPROC(ftrace_caller)

#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
ENTRY(ftrace_regs_caller)
UNWIND(.fnstart)
	__ftrace_regs_caller
UNWIND(.fnend)
ENDPROC(ftrace_regs_caller)
#endif

#endif

#ifdef CONFIG_FUNCTION_GRAPH_TRACER
ENTRY(ftrace_graph_caller)
UNWIND(.fnstart)
	__ftrace_graph_caller
UNWIND(.fnend)
ENDPROC(ftrace_graph_caller)

#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
ENTRY(ftrace_graph_regs_caller)
UNWIND(.fnstart)
	__ftrace_graph_regs_caller
UNWIND(.fnend)
ENDPROC(ftrace_graph_regs_caller)
#endif
#endif

.purgem mcount_enter
.purgem mcount_get_lr
.purgem mcount_exit

#ifdef CONFIG_FUNCTION_GRAPH_TRACER
ENTRY(return_to_handler)
	stmdb	sp!, {r0-r3}
	add	r0, sp, #16		@ sp at exit of instrumented routine
	bl	ftrace_return_to_handler
	mov	lr, r0			@ r0 has real ret addr
	ldmia	sp!, {r0-r3}
	ret	lr
ENDPROC(return_to_handler)
#endif

ENTRY(ftrace_stub)
.Lftrace_stub:
	ret	lr
ENDPROC(ftrace_stub)

#ifdef CONFIG_DYNAMIC_FTRACE

	__INIT

	.macro	init_tramp, dst:req
ENTRY(\dst\()_from_init)
	ldr	pc, =\dst
ENDPROC(\dst\()_from_init)
	.endm

	init_tramp	ftrace_caller
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
	init_tramp	ftrace_regs_caller
#endif
#endif