summaryrefslogtreecommitdiff
path: root/EdkCompatibilityPkg/Foundation/Library/Pei/PeiLib/Ipf/SetJmp.s
blob: d98d07aef34acbaf3a941addb604589112142ead (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
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)