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
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
|
/*
* This file contains the generic code to perform a call to the
* pSeries LPAR hypervisor.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/jump_label.h>
#include <asm/hvcall.h>
#include <asm/processor.h>
#include <asm/ppc_asm.h>
#include <asm/asm-offsets.h>
#include <asm/ptrace.h>
.section ".text"
#ifdef CONFIG_TRACEPOINTS
#ifndef HAVE_JUMP_LABEL
.section ".toc","aw"
.globl hcall_tracepoint_refcount
hcall_tracepoint_refcount:
.llong 0
.section ".text"
#endif
/*
* precall must preserve all registers. use unused STK_PARAM()
* areas to save snapshots and opcode.
*/
#define HCALL_INST_PRECALL(FIRST_REG) \
mflr r0; \
std r3,STK_PARAM(R3)(r1); \
std r4,STK_PARAM(R4)(r1); \
std r5,STK_PARAM(R5)(r1); \
std r6,STK_PARAM(R6)(r1); \
std r7,STK_PARAM(R7)(r1); \
std r8,STK_PARAM(R8)(r1); \
std r9,STK_PARAM(R9)(r1); \
std r10,STK_PARAM(R10)(r1); \
std r0,16(r1); \
addi r4,r1,STK_PARAM(FIRST_REG); \
stdu r1,-STACK_FRAME_OVERHEAD(r1); \
bl __trace_hcall_entry; \
ld r3,STACK_FRAME_OVERHEAD+STK_PARAM(R3)(r1); \
ld r4,STACK_FRAME_OVERHEAD+STK_PARAM(R4)(r1); \
ld r5,STACK_FRAME_OVERHEAD+STK_PARAM(R5)(r1); \
ld r6,STACK_FRAME_OVERHEAD+STK_PARAM(R6)(r1); \
ld r7,STACK_FRAME_OVERHEAD+STK_PARAM(R7)(r1); \
ld r8,STACK_FRAME_OVERHEAD+STK_PARAM(R8)(r1); \
ld r9,STACK_FRAME_OVERHEAD+STK_PARAM(R9)(r1); \
ld r10,STACK_FRAME_OVERHEAD+STK_PARAM(R10)(r1)
/*
* postcall is performed immediately before function return which
* allows liberal use of volatile registers.
*/
#define __HCALL_INST_POSTCALL \
ld r0,STACK_FRAME_OVERHEAD+STK_PARAM(R3)(r1); \
std r3,STACK_FRAME_OVERHEAD+STK_PARAM(R3)(r1); \
mr r4,r3; \
mr r3,r0; \
bl __trace_hcall_exit; \
ld r0,STACK_FRAME_OVERHEAD+16(r1); \
addi r1,r1,STACK_FRAME_OVERHEAD; \
ld r3,STK_PARAM(R3)(r1); \
mtlr r0
#define HCALL_INST_POSTCALL_NORETS \
li r5,0; \
__HCALL_INST_POSTCALL
#define HCALL_INST_POSTCALL(BUFREG) \
mr r5,BUFREG; \
__HCALL_INST_POSTCALL
#ifdef HAVE_JUMP_LABEL
#define HCALL_BRANCH(LABEL) \
ARCH_STATIC_BRANCH(LABEL, hcall_tracepoint_key)
#else
/*
* We branch around this in early init (eg when populating the MMU
* hashtable) by using an unconditional cpu feature.
*/
#define HCALL_BRANCH(LABEL) \
BEGIN_FTR_SECTION; \
b 1f; \
END_FTR_SECTION(0, 1); \
ld r12,hcall_tracepoint_refcount@toc(r2); \
std r12,32(r1); \
cmpdi r12,0; \
bne- LABEL; \
1:
#endif
#else
#define HCALL_INST_PRECALL(FIRST_ARG)
#define HCALL_INST_POSTCALL_NORETS
#define HCALL_INST_POSTCALL(BUFREG)
#define HCALL_BRANCH(LABEL)
#endif
_GLOBAL_TOC(plpar_hcall_norets)
HMT_MEDIUM
mfcr r0
stw r0,8(r1)
HCALL_BRANCH(plpar_hcall_norets_trace)
HVSC /* invoke the hypervisor */
lwz r0,8(r1)
mtcrf 0xff,r0
blr /* return r3 = status */
#ifdef CONFIG_TRACEPOINTS
plpar_hcall_norets_trace:
HCALL_INST_PRECALL(R4)
HVSC
HCALL_INST_POSTCALL_NORETS
lwz r0,8(r1)
mtcrf 0xff,r0
blr
#endif
_GLOBAL_TOC(plpar_hcall)
HMT_MEDIUM
mfcr r0
stw r0,8(r1)
HCALL_BRANCH(plpar_hcall_trace)
std r4,STK_PARAM(R4)(r1) /* Save ret buffer */
mr r4,r5
mr r5,r6
mr r6,r7
mr r7,r8
mr r8,r9
mr r9,r10
HVSC /* invoke the hypervisor */
ld r12,STK_PARAM(R4)(r1)
std r4, 0(r12)
std r5, 8(r12)
std r6, 16(r12)
std r7, 24(r12)
lwz r0,8(r1)
mtcrf 0xff,r0
blr /* return r3 = status */
#ifdef CONFIG_TRACEPOINTS
plpar_hcall_trace:
HCALL_INST_PRECALL(R5)
std r4,STK_PARAM(R4)(r1)
mr r0,r4
mr r4,r5
mr r5,r6
mr r6,r7
mr r7,r8
mr r8,r9
mr r9,r10
HVSC
ld r12,STK_PARAM(R4)(r1)
std r4,0(r12)
std r5,8(r12)
std r6,16(r12)
std r7,24(r12)
HCALL_INST_POSTCALL(r12)
lwz r0,8(r1)
mtcrf 0xff,r0
blr
#endif
/*
* plpar_hcall_raw can be called in real mode. kexec/kdump need some
* hypervisor calls to be executed in real mode. So plpar_hcall_raw
* does not access the per cpu hypervisor call statistics variables,
* since these variables may not be present in the RMO region.
*/
_GLOBAL(plpar_hcall_raw)
HMT_MEDIUM
mfcr r0
stw r0,8(r1)
std r4,STK_PARAM(R4)(r1) /* Save ret buffer */
mr r4,r5
mr r5,r6
mr r6,r7
mr r7,r8
mr r8,r9
mr r9,r10
HVSC /* invoke the hypervisor */
ld r12,STK_PARAM(R4)(r1)
std r4, 0(r12)
std r5, 8(r12)
std r6, 16(r12)
std r7, 24(r12)
lwz r0,8(r1)
mtcrf 0xff,r0
blr /* return r3 = status */
_GLOBAL_TOC(plpar_hcall9)
HMT_MEDIUM
mfcr r0
stw r0,8(r1)
HCALL_BRANCH(plpar_hcall9_trace)
std r4,STK_PARAM(R4)(r1) /* Save ret buffer */
mr r4,r5
mr r5,r6
mr r6,r7
mr r7,r8
mr r8,r9
mr r9,r10
ld r10,STK_PARAM(R11)(r1) /* put arg7 in R10 */
ld r11,STK_PARAM(R12)(r1) /* put arg8 in R11 */
ld r12,STK_PARAM(R13)(r1) /* put arg9 in R12 */
HVSC /* invoke the hypervisor */
mr r0,r12
ld r12,STK_PARAM(R4)(r1)
std r4, 0(r12)
std r5, 8(r12)
std r6, 16(r12)
std r7, 24(r12)
std r8, 32(r12)
std r9, 40(r12)
std r10,48(r12)
std r11,56(r12)
std r0, 64(r12)
lwz r0,8(r1)
mtcrf 0xff,r0
blr /* return r3 = status */
#ifdef CONFIG_TRACEPOINTS
plpar_hcall9_trace:
HCALL_INST_PRECALL(R5)
std r4,STK_PARAM(R4)(r1)
mr r0,r4
mr r4,r5
mr r5,r6
mr r6,r7
mr r7,r8
mr r8,r9
mr r9,r10
ld r10,STACK_FRAME_OVERHEAD+STK_PARAM(R11)(r1)
ld r11,STACK_FRAME_OVERHEAD+STK_PARAM(R12)(r1)
ld r12,STACK_FRAME_OVERHEAD+STK_PARAM(R13)(r1)
HVSC
mr r0,r12
ld r12,STACK_FRAME_OVERHEAD+STK_PARAM(R4)(r1)
std r4,0(r12)
std r5,8(r12)
std r6,16(r12)
std r7,24(r12)
std r8,32(r12)
std r9,40(r12)
std r10,48(r12)
std r11,56(r12)
std r0,64(r12)
HCALL_INST_POSTCALL(r12)
lwz r0,8(r1)
mtcrf 0xff,r0
blr
#endif
/* See plpar_hcall_raw to see why this is needed */
_GLOBAL(plpar_hcall9_raw)
HMT_MEDIUM
mfcr r0
stw r0,8(r1)
std r4,STK_PARAM(R4)(r1) /* Save ret buffer */
mr r4,r5
mr r5,r6
mr r6,r7
mr r7,r8
mr r8,r9
mr r9,r10
ld r10,STK_PARAM(R11)(r1) /* put arg7 in R10 */
ld r11,STK_PARAM(R12)(r1) /* put arg8 in R11 */
ld r12,STK_PARAM(R13)(r1) /* put arg9 in R12 */
HVSC /* invoke the hypervisor */
mr r0,r12
ld r12,STK_PARAM(R4)(r1)
std r4, 0(r12)
std r5, 8(r12)
std r6, 16(r12)
std r7, 24(r12)
std r8, 32(r12)
std r9, 40(r12)
std r10,48(r12)
std r11,56(r12)
std r0, 64(r12)
lwz r0,8(r1)
mtcrf 0xff,r0
blr /* return r3 = status */
|
