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
|
//++
// Copyright (c) 2004, Intel Corporation
// All rights reserved. This program and the accompanying materials
// are licensed and made available under the terms and conditions of the BSD License
// which accompanies this distribution. The full text of the license may be found at
// http://opensource.org/licenses/bsd-license.php
//
// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
//
// Module Name:
//
// setjmp.s
//
// Abstract:
//
// Contains an implementation of setjmp and longjmp for the
// Itanium-based architecture.
//
//
//
// Revision History:
//
//--
.file "setjmp.s"
#include <Asm.h>
#include <Ia_64Gen.h>
// int SetJump(struct jmp_buffer save)
//
// Setup a non-local goto.
//
// Description:
//
// SetJump stores the current register set in the area pointed to
// by "save". It returns zero. Subsequent calls to "LongJump" will
// restore the registers and return non-zero to the same location.
//
// On entry, r32 contains the pointer to the jmp_buffer
//
PROCEDURE_ENTRY(SetJump)
//
// Make sure buffer is aligned at 16byte boundary
//
mov r32 = r33
add r10 = -0x10,r0 ;; // mask the lower 4 bits
and r32 = r32, r10;;
add r32 = 0x10, r32;; // move to next 16 byte boundary
add r10 = J_PREDS, r32 // skip Unats & pfs save area
add r11 = J_BSP, r32
//
// save immediate context
//
mov r2 = ar.bsp // save backing store pointer
mov r3 = pr // save predicates
;;
//
// save user Unat register
//
mov r16 = ar.lc // save loop count register
mov r14 = ar.unat // save user Unat register
st8 [r10] = r3, J_LC-J_PREDS
st8 [r11] = r2, J_R4-J_BSP
;;
st8 [r10] = r16, J_R5-J_LC
st8 [r32] = r14, J_NATS // Note: Unat at the
// beginning of the save area
mov r15 = ar.pfs
;;
//
// save preserved general registers & NaT's
//
st8.spill [r11] = r4, J_R6-J_R4
;;
st8.spill [r10] = r5, J_R7-J_R5
;;
st8.spill [r11] = r6, J_SP-J_R6
;;
st8.spill [r10] = r7, J_F3-J_R7
;;
st8.spill [r11] = sp, J_F2-J_SP
;;
//
// save spilled Unat and pfs registers
//
mov r2 = ar.unat // save Unat register after spill
;;
st8 [r32] = r2, J_PFS-J_NATS // save unat for spilled regs
;;
st8 [r32] = r15 // save pfs
//
// save floating registers
//
stf.spill [r11] = f2, J_F4-J_F2
stf.spill [r10] = f3, J_F5-J_F3
;;
stf.spill [r11] = f4, J_F16-J_F4
stf.spill [r10] = f5, J_F17-J_F5
;;
stf.spill [r11] = f16, J_F18-J_F16
stf.spill [r10] = f17, J_F19-J_F17
;;
stf.spill [r11] = f18, J_F20-J_F18
stf.spill [r10] = f19, J_F21-J_F19
;;
stf.spill [r11] = f20, J_F22-J_F20
stf.spill [r10] = f21, J_F23-J_F21
;;
stf.spill [r11] = f22, J_F24-J_F22
stf.spill [r10] = f23, J_F25-J_F23
;;
stf.spill [r11] = f24, J_F26-J_F24
stf.spill [r10] = f25, J_F27-J_F25
;;
stf.spill [r11] = f26, J_F28-J_F26
stf.spill [r10] = f27, J_F29-J_F27
;;
stf.spill [r11] = f28, J_F30-J_F28
stf.spill [r10] = f29, J_F31-J_F29
;;
stf.spill [r11] = f30, J_FPSR-J_F30
stf.spill [r10] = f31, J_B0-J_F31 // size of f31 + fpsr
//
// save FPSR register & branch registers
//
mov r2 = ar.fpsr // save fpsr register
mov r3 = b0
;;
st8 [r11] = r2, J_B1-J_FPSR
st8 [r10] = r3, J_B2-J_B0
mov r2 = b1
mov r3 = b2
;;
st8 [r11] = r2, J_B3-J_B1
st8 [r10] = r3, J_B4-J_B2
mov r2 = b3
mov r3 = b4
;;
st8 [r11] = r2, J_B5-J_B3
st8 [r10] = r3
mov r2 = b5
;;
st8 [r11] = r2
;;
//
// return
//
mov r8 = r0 // return 0 from setjmp
mov ar.unat = r14 // restore unat
br.ret.sptk b0
PROCEDURE_EXIT(SetJump)
//
// void LongJump(struct jmp_buffer *)
//
// Perform a non-local goto.
//
// Description:
//
// LongJump initializes the register set to the values saved by a
// previous 'SetJump' and jumps to the return location saved by that
// 'SetJump'. This has the effect of unwinding the stack and returning
// for a second time to the 'SetJump'.
//
PROCEDURE_ENTRY(LongJump)
//
// Make sure buffer is aligned at 16byte boundary
//
mov r32 = r33
add r10 = -0x10,r0 ;; // mask the lower 4 bits
and r32 = r32, r10;;
add r32 = 0x10, r32;; // move to next 16 byte boundary
//
// caching the return value as we do invala in the end
//
/// mov r8 = r33 // return value
mov r8 = 1 // For now return hard coded 1
//
// get immediate context
//
mov r14 = ar.rsc // get user RSC conf
add r10 = J_PFS, r32 // get address of pfs
add r11 = J_NATS, r32
;;
ld8 r15 = [r10], J_BSP-J_PFS // get pfs
ld8 r2 = [r11], J_LC-J_NATS // get unat for spilled regs
;;
mov ar.unat = r2
;;
ld8 r16 = [r10], J_PREDS-J_BSP // get backing store pointer
mov ar.rsc = r0 // put RSE in enforced lazy
mov ar.pfs = r15
;;
//
// while returning from longjmp the BSPSTORE and BSP needs to be
// same and discard all the registers allocated after we did
// setjmp. Also, we need to generate the RNAT register since we
// did not flushed the RSE on setjmp.
//
mov r17 = ar.bspstore // get current BSPSTORE
;;
cmp.ltu p6,p7 = r17, r16 // is it less than BSP of
(p6) br.spnt.few .flush_rse
mov r19 = ar.rnat // get current RNAT
;;
loadrs // invalidate dirty regs
br.sptk.many .restore_rnat // restore RNAT
.flush_rse:
flushrs
;;
mov r19 = ar.rnat // get current RNAT
mov r17 = r16 // current BSPSTORE
;;
.restore_rnat:
//
// check if RNAT is saved between saved BSP and curr BSPSTORE
//
dep r18 = -1,r16,3,6 // get RNAT address
;;
cmp.ltu p8,p9 = r18, r17 // RNAT saved on RSE
;;
(p8) ld8 r19 = [r18] // get RNAT from RSE
;;
mov ar.bspstore = r16 // set new BSPSTORE
;;
mov ar.rnat = r19 // restore RNAT
mov ar.rsc = r14 // restore RSC conf
ld8 r3 = [r11], J_R4-J_LC // get lc register
ld8 r2 = [r10], J_R5-J_PREDS // get predicates
;;
mov pr = r2, -1
mov ar.lc = r3
//
// restore preserved general registers & NaT's
//
ld8.fill r4 = [r11], J_R6-J_R4
;;
ld8.fill r5 = [r10], J_R7-J_R5
ld8.fill r6 = [r11], J_SP-J_R6
;;
ld8.fill r7 = [r10], J_F2-J_R7
ld8.fill sp = [r11], J_F3-J_SP
;;
//
// restore floating registers
//
ldf.fill f2 = [r10], J_F4-J_F2
ldf.fill f3 = [r11], J_F5-J_F3
;;
ldf.fill f4 = [r10], J_F16-J_F4
ldf.fill f5 = [r11], J_F17-J_F5
;;
ldf.fill f16 = [r10], J_F18-J_F16
ldf.fill f17 = [r11], J_F19-J_F17
;;
ldf.fill f18 = [r10], J_F20-J_F18
ldf.fill f19 = [r11], J_F21-J_F19
;;
ldf.fill f20 = [r10], J_F22-J_F20
ldf.fill f21 = [r11], J_F23-J_F21
;;
ldf.fill f22 = [r10], J_F24-J_F22
ldf.fill f23 = [r11], J_F25-J_F23
;;
ldf.fill f24 = [r10], J_F26-J_F24
ldf.fill f25 = [r11], J_F27-J_F25
;;
ldf.fill f26 = [r10], J_F28-J_F26
ldf.fill f27 = [r11], J_F29-J_F27
;;
ldf.fill f28 = [r10], J_F30-J_F28
ldf.fill f29 = [r11], J_F31-J_F29
;;
ldf.fill f30 = [r10], J_FPSR-J_F30
ldf.fill f31 = [r11], J_B0-J_F31 ;;
//
// restore branch registers and fpsr
//
ld8 r16 = [r10], J_B1-J_FPSR // get fpsr
ld8 r17 = [r11], J_B2-J_B0 // get return pointer
;;
mov ar.fpsr = r16
mov b0 = r17
ld8 r2 = [r10], J_B3-J_B1
ld8 r3 = [r11], J_B4-J_B2
;;
mov b1 = r2
mov b2 = r3
ld8 r2 = [r10], J_B5-J_B3
ld8 r3 = [r11]
;;
mov b3 = r2
mov b4 = r3
ld8 r2 = [r10]
ld8 r21 = [r32] // get user unat
;;
mov b5 = r2
mov ar.unat = r21
//
// invalidate ALAT
//
invala ;;
br.ret.sptk b0
PROCEDURE_EXIT(LongJump)
|
