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
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
|
/*--------------------------------------------------------------------*/
/*--- The core dispatch loop, for jumping to a code address. ---*/
/*--- dispatch-mips64-linux.S ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, a dynamic binary instrumentation
framework.
Copyright (C) 2000-2017 RT-RK
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.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
The GNU General Public License is contained in the file COPYING.
*/
#include "pub_core_basics_asm.h"
#if defined(VGP_mips64_linux)
#include "pub_core_dispatch_asm.h"
#include "pub_core_transtab_asm.h"
#include "libvex_guest_offsets.h" /* for OFFSET_mips_PC */
/*------------------------------------------------------------*/
/*--- ---*/
/*--- The dispatch loop. VG_(disp_run_translations) is ---*/
/*--- used to run all translations, ---*/
/*--- including no-redir ones. ---*/
/*--- ---*/
/*------------------------------------------------------------*/
/*----------------------------------------------------*/
/*--- Entry and preamble (set everything up) ---*/
/*----------------------------------------------------*/
/* signature:
void VG_(disp_run_translations)( UWord* two_words,
void* guest_state,
Addr host_addr );
*/
.text
.globl VG_(disp_run_translations)
VG_(disp_run_translations):
/* a0 ($4) holds two_words */
/* a1 ($5) holds guest_state */
/* a2 ($6) holds host_addr */
/* New stack frame. Stack must remain 16 aligned (at least) */
daddiu $29, -176
/* Save ra */
sd $31, 72($29)
/* ... and s0 - s7 */
sd $16, 80($29)
sd $17, 88($29)
sd $18, 96($29)
sd $19, 104($29)
sd $20, 112($29)
sd $21, 120($29)
sd $22, 128($29)
sd $23, 136($29)
/* ... and gp, fp/s8 */
sd $28, 144($29)
sd $30, 152($29)
/* Save a0 ($4) on stack. In postamble it will be restored such that the
return values can be written */
sd $4, 160($29)
/* Load address of guest state into guest state register ($23) */
move $23, $5
/* and jump into the code cache. Chained translations in
the code cache run, until for whatever reason, they can't
continue. When that happens, the translation in question
will jump (or call) to one of the continuation points
VG_(cp_...) below. */
jr $6
/*NOTREACHED*/
/*----------------------------------------------------*/
/*--- Postamble and exit. ---*/
/*----------------------------------------------------*/
postamble:
/* At this point, $2 and $3 contain two
words to be returned to the caller. $2
holds a TRC value, and $3 optionally may
hold another word (for CHAIN_ME exits, the
address of the place to patch.) */
/* Restore $4 from stack; holds address of two_words */
ld $4, 160($29)
#if defined(VGABI_64)
sd $2, 0($4) /* Store $2 to two_words[0] */
sd $3, 8($4) /* Store $3 to two_words[1] */
#elif defined(VGABI_N32)
sw $2, 0($4) /* Store $2 to two_words[0] */
sw $3, 4($4) /* Store $3 to two_words[1] */
#else
#error unknown mips64 abi
#endif
/* Restore callee-saved registers... */
/* Restore ra */
ld $31, 72($29)
/* ... and s0 - s7 */
ld $16, 80($29)
ld $17, 88($29)
ld $18, 96($29)
ld $19, 104($29)
ld $20, 112($29)
ld $21, 120($29)
ld $22, 128($29)
ld $23, 136($29)
/* ... and gp, fp/s8 */
ld $28, 144($29)
ld $30, 152($29)
daddiu $29, 176 /* stack_size */
jr $31
nop
/*----------------------------------------------------*/
/*--- Continuation points ---*/
/*----------------------------------------------------*/
/* ------ Chain me to slow entry point ------ */
.global VG_(disp_cp_chain_me_to_slowEP)
VG_(disp_cp_chain_me_to_slowEP):
/* We got called. The return address indicates
where the patching needs to happen. Collect
the return address and, exit back to C land,
handing the caller the pair (Chain_me_S, RA) */
li $2, VG_TRC_CHAIN_ME_TO_SLOW_EP
move $3, $31
/* 8 = mkLoadImm_EXACTLY2or6
4 = jalr $9
4 = nop */
daddiu $3, $3, -32
b postamble
/* ------ Chain me to slow entry point ------ */
.global VG_(disp_cp_chain_me_to_fastEP)
VG_(disp_cp_chain_me_to_fastEP):
/* We got called. The return address indicates
where the patching needs to happen. Collect
the return address and, exit back to C land,
handing the caller the pair (Chain_me_S, RA) */
li $2, VG_TRC_CHAIN_ME_TO_FAST_EP
move $3, $31
/* 8 = mkLoadImm_EXACTLY2or6
4 = jalr $9
4 = nop */
daddiu $3, $3, -32
b postamble
/* ------ Indirect but boring jump ------ */
.global VG_(disp_cp_xindir)
VG_(disp_cp_xindir):
/* Where are we going? */
ld $10, OFFSET_mips64_PC($23)
/* stats only */
lw $15, VG_(stats__n_xIndirs_32)
addiu $15, $15, 1
sw $15, VG_(stats__n_xIndirs_32)
// LIVE: r23 (guest state ptr), r10 (guest address to go to).
// We use 6 temporaries:
// r16 (to point at the relevant FastCacheSet),
// r11, r12, r13 (scratch, for swapping entries within a set)
// r14, r15 (other scratch)
/* Try a fast lookup in the translation cache. This is pretty much
a handcoded version of VG_(lookupInFastCache). */
// Compute r16 = VG_TT_FAST_HASH(guest)
dsrl $16, $10, 2 // g2 = guest >> 2
dsrl $15, $10, (VG_TT_FAST_BITS + 2) // (g2 >> VG_TT_FAST_BITS)
xor $16, $16, $15 // (g2 >> VG_TT_FAST_BITS) ^ g2
li $15, VG_TT_FAST_MASK
and $16, $16, $15 // setNo
// Compute r16 = &VG_(tt_fast)[r16]
dla $15, VG_(tt_fast)
dsll $16, $16, VG_FAST_CACHE_SET_BITS
daddu $16, $16, $15
// LIVE: r23 (guest state ptr), r10 (guest addr), r16 (cache set)
// try way 0
ld $14, FCS_g0($16) // .guest0
ld $15, FCS_h0($16) // .host0
bne $14, $10, 1f // cmp against .guest0
// hit at way 0
// goto .host0
jr $15
/*NOTREACHED*/
.long 0x0
1: // try way 1
#if defined(VGABI_64)
ld $14, FCS_g1($16)
bne $14, $10, 2f // cmp against .guest1
// hit at way 1; swap upwards
ld $11, FCS_g0($16) // $11 = old .guest0
ld $12, FCS_h0($16) // $12 = old .host0
ld $13, FCS_h1($16) // $13 = old .host1
sd $10, FCS_g0($16) // new .guest0 = guest
sd $13, FCS_h0($16) // new .host0 = old .host1
sd $11, FCS_g1($16) // new .guest1 = old .guest0
sd $12, FCS_h1($16) // new .host1 = old .host0
#elif defined(VGABI_N32)
lw $14, FCS_g1($16)
bne $14, $10, 2f
lw $11, FCS_g0($16)
lw $12, FCS_h0($16)
lw $13, FCS_h1($16)
sw $10, FCS_g0($16)
sw $13, FCS_h0($16)
sw $11, FCS_g1($16)
sw $12, FCS_h1($16)
#endif
// stats only
lw $15, VG_(stats__n_xIndir_hits1_32)
addiu $15, $15, 1
sw $15, VG_(stats__n_xIndir_hits1_32)
// goto old .host1 a.k.a. new .host0
jr $13
/*NOTREACHED*/
.long 0x0
2: // try way 2
#if defined(VGABI_64)
ld $14, FCS_g2($16)
bne $14, $10, 3f // cmp against .guest2
// hit at way 2; swap upwards
ld $11, FCS_g1($16)
ld $12, FCS_h1($16)
ld $13, FCS_h2($16)
sd $10, FCS_g1($16)
sd $13, FCS_h1($16)
sd $11, FCS_g2($16)
sd $12, FCS_h2($16)
#elif defined(VGABI_N32)
lw $14, FCS_g2($16)
bne $14, $10, 3f
lw $11, FCS_g1($16)
lw $12, FCS_h1($16)
lw $13, FCS_h2($16)
sw $10, FCS_g1($16)
sw $13, FCS_h1($16)
sw $11, FCS_g2($16)
sw $12, FCS_h2($16)
#endif
// stats only
lw $15, VG_(stats__n_xIndir_hits2_32)
addiu $15, $15, 1
sw $15, VG_(stats__n_xIndir_hits2_32)
// goto old .host2 a.k.a. new .host1
jr $13
/*NOTREACHED*/
.long 0x0
3: // try way 3
#if defined(VGABI_64)
ld $14, FCS_g3($16)
bne $14, $10, 4f // cmp against .guest3
// hit at way 3; swap upwards
ld $11, FCS_g2($16)
ld $12, FCS_h2($16)
ld $13, FCS_h3($16)
sd $10, FCS_g2($16)
sd $13, FCS_h2($16)
sd $11, FCS_g3($16)
sd $12, FCS_h3($16)
#elif defined(VGABI_N32)
lw $14, FCS_g3($16)
bne $14, $10, 4f
lw $11, FCS_g2($16)
lw $12, FCS_h2($16)
lw $13, FCS_h3($16)
sw $10, FCS_g2($16)
sw $13, FCS_h2($16)
sw $11, FCS_g3($16)
sw $12, FCS_h3($16)
#endif
// stats only
lw $15, VG_(stats__n_xIndir_hits3_32)
addiu $15, $15, 1
sw $15, VG_(stats__n_xIndir_hits3_32)
// goto old .host3 a.k.a. new .host2
jr $13
/*NOTREACHED*/
.long 0x0
4: // fast lookup failed:
/* stats only */
lw $15, VG_(stats__n_xIndir_misses_32)
addiu $15, $15, 1
sw $15, VG_(stats__n_xIndir_misses_32)
li $2, VG_TRC_INNER_FASTMISS
li $3, 0
b postamble
/*NOTREACHED*/
.long 0x0
/* ------ Assisted jump ------ */
.global VG_(disp_cp_xassisted)
VG_(disp_cp_xassisted):
/* guest-state-pointer contains the TRC. Put the value into the
return register */
move $2, $23
move $3, $0
b postamble
/* ------ Event check failed ------ */
.global VG_(disp_cp_evcheck_fail)
VG_(disp_cp_evcheck_fail):
li $2, VG_TRC_INNER_COUNTERZERO
move $3, $0
b postamble
.size VG_(disp_run_translations), .-VG_(disp_run_translations)
#endif // defined(VGP_mips64_linux)
/* Let the linker know we don't need an executable stack */
MARK_STACK_NO_EXEC
/*--------------------------------------------------------------------*/
/*--- end ---*/
/*--------------------------------------------------------------------*/
|
