summaryrefslogtreecommitdiff
path: root/SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/Ia32/AsmFuncs.S
blob: efeaebc2c84a3b9d85ebc4e1a7c1ce9dd02bfa8d (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
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
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
#------------------------------------------------------------------------------
#
# Copyright (c) 2010 - 2013, Intel Corporation. All rights reserved.<BR>
# 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:
#
#   AsmFuncs.S
#
# Abstract:
#
#   Debug interrupt handle functions.
#
#------------------------------------------------------------------------------

#include "DebugException.h"

ASM_GLOBAL ASM_PFX(InterruptProcess)
ASM_GLOBAL ASM_PFX(Exception0Handle)
ASM_GLOBAL ASM_PFX(ExceptionStubHeaderSize)
ASM_GLOBAL ASM_PFX(TimerInterruptHandle)
ASM_GLOBAL ASM_PFX(CommonEntry)

.macro  AGENT_HANDLER_SIGNATURE
  .byte 0x41, 0x47, 0x54, 0x48   # AGENT_HANDLER_SIGNATURE     SIGNATURE_32('A','G','T','H')
.endm

.data

ASM_PFX(ExceptionStubHeaderSize):  .long     ASM_PFX(Exception1Handle) - ASM_PFX(Exception0Handle)

.text

AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception0Handle):
   cli
   pushl %eax
   mov   $0, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception1Handle):
   cli
   pushl %eax
   mov   $1, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception2Handle):
   cli
   pushl %eax
   mov   $2, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception3Handle):
   cli
   pushl %eax
   mov   $3, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception4Handle):
   cli
   pushl %eax
   mov   $4, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception5Handle):
   cli
   pushl %eax
   mov   $5, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception6Handle):
   cli
   pushl %eax
   mov   $6, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception7Handle):
   cli
   pushl %eax
   mov   $7, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception8Handle):
   cli
   pushl %eax
   mov   $8, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception9Handle):
   cli
   pushl %eax
   mov   $9, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception10Handle):
   cli
   pushl %eax
   mov   $10, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception11Handle):
   cli
   pushl %eax
   mov   $11, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception12Handle):
   cli
   pushl %eax
   mov   $12, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception13Handle):
   cli
   pushl %eax
   mov   $13, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception14Handle):
   cli
   pushl %eax
   mov   $14, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception15Handle):
   cli
   pushl %eax
   mov   $15, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception16Handle):
   cli
   pushl %eax
   mov   $16, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception17Handle):
   cli
   pushl %eax
   mov   $17, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception18Handle):
   cli
   pushl %eax
   mov   $18, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(Exception19Handle):
   cli
   pushl %eax
   mov   $19, %eax
   jmp   ASM_PFX(CommonEntry)
AGENT_HANDLER_SIGNATURE
ASM_PFX(TimerInterruptHandle):
   cli
   pushl %eax
   mov   $32, %eax
   jmp   ASM_PFX(CommonEntry)


ASM_PFX(CommonEntry):

#---------------------------------------;
# _CommonEntry                  ;
#----------------------------------------------------------------------------;
# The follow algorithm is used for the common interrupt routine.
# Entry from each interrupt with a push eax and eax=interrupt number
#
# +---------------------+
# +    EFlags           +
# +---------------------+
# +    CS               +
# +---------------------+
# +    EIP              +
# +---------------------+
# +    Error Code       +
# +---------------------+
# + EAX / Vector Number +
# +---------------------+
# +    EBP              +
# +---------------------+ <-- EBP
#

# We need to determine if any extra data was pushed by the exception
  cmpl    $DEBUG_EXCEPT_DOUBLE_FAULT, %eax
  je      NoExtrPush
  cmpl    $DEBUG_EXCEPT_INVALID_TSS, %eax
  je      NoExtrPush
  cmpl    $DEBUG_EXCEPT_SEG_NOT_PRESENT, %eax
  je      NoExtrPush
  cmpl    $DEBUG_EXCEPT_STACK_FAULT, %eax
  je      NoExtrPush
  cmpl    $DEBUG_EXCEPT_GP_FAULT, %eax
  je      NoExtrPush
  cmpl    $DEBUG_EXCEPT_PAGE_FAULT, %eax
  je      NoExtrPush
  cmpl    $DEBUG_EXCEPT_ALIGNMENT_CHECK, %eax
  je      NoExtrPush

  pushl    (%esp)
  movl     $0, 4(%esp)

NoExtrPush:

  pushl   %ebp
  movl    %esp,%ebp

  #
  # Align stack to make sure that EFI_FX_SAVE_STATE_IA32 of EFI_SYSTEM_CONTEXT_IA32
  # is 16-byte aligned
  #
  andl    $0xfffffff0,%esp
  subl    $12,%esp

## UINT32  Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;
  pushl   0x4(%ebp)
  pushl   %ebx
  pushl   %ecx
  pushl   %edx
  mov     %eax, %ebx                   # save vector in ebx
  leal    24(%ebp),%ecx
  pushl   %ecx                         # save original ESP
  pushl   (%ebp)
  pushl   %esi
  pushl   %edi

## UINT32  Cr0, Cr1, Cr2, Cr3, Cr4;
  movl    %cr4, %eax
  orl     $0x208,%eax
  movl    %eax, %cr4
  pushl   %eax
  movl    %cr3, %eax
  pushl   %eax
  movl    %cr2, %eax
  pushl   %eax
  xorl    %eax,%eax
  pushl   %eax
  movl    %cr0, %eax
  pushl   %eax

## UINT32  Gs, Fs, Es, Ds, Cs, Ss;
  movl    %ss,%eax
  pushl   %eax
  movzwl  16(%ebp), %eax
  pushl   %eax
  movl    %ds,%eax
  pushl   %eax
  movl    %es,%eax
  pushl   %eax
  movl    %fs,%eax
  pushl   %eax
  movl    %gs,%eax
  pushl   %eax

## UINT32  Eip;
  pushl   12(%ebp)

## UINT32  Gdtr[2], Idtr[2];
  subl    $8,%esp
  sidt    (%esp)
  subl    $8,%esp
  sgdt    (%esp)

## UINT32  Ldtr, Tr;
  xorl    %eax,%eax
  strl    %eax
  pushl   %eax
  sldtl   %eax
  pushl   %eax

## UINT32  EFlags;
  pushl   20(%ebp)

## UINT32  Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
  movl    %dr7, %eax
  pushl   %eax
## clear Dr7 while executing debugger itself
  xorl    %eax,%eax
  movl    %eax, %dr7

  movl    %dr6, %eax
  pushl   %eax
## insure all status bits in dr6 are clear...
  xorl    %eax,%eax
  movl    %eax, %dr6

  movl    %dr3, %eax
  pushl   %eax
  movl    %dr2, %eax
  pushl   %eax
  movl    %dr1, %eax
  pushl   %eax
  movl    %dr0, %eax
  pushl   %eax

## FX_SAVE_STATE_IA32 FxSaveState;
  subl    $512,%esp
  movl    %esp,%edi
  .byte 0x0f, 0xae, 0x07   # fxsave [edi]

## save the exception data
  pushl   8(%esp)

## Clear Direction Flag
  cld
	
## Prepare parameter and call C function
  pushl   %esp
  pushl   %ebx
  call    ASM_PFX(InterruptProcess)
  addl    $8,%esp

## skip the exception data
  addl    $4,%esp

## FX_SAVE_STATE_IA32 FxSaveState;
  movl    %esp,%esi
  .byte 0x0f, 0xae, 0x0e   # fxrstor [esi]
  addl    $512,%esp

## UINT32  Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
  popl    %eax
  movl    %eax, %dr0
  popl    %eax
  movl    %eax, %dr1
  popl    %eax
  movl    %eax, %dr2
  popl    %eax
  movl    %eax, %dr3
## skip restore of dr6.  We cleared dr6 during the context save.
  addl    $4,%esp
  popl    %eax
  movl    %eax, %dr7

## UINT32  EFlags;
  popl    20(%ebp)

## UINT32  Ldtr, Tr;
## UINT32  Gdtr[2], Idtr[2];
## Best not let anyone mess with these particular registers...
  addl     $24,%esp

## UINT32  Eip;
   pop     12(%ebp)

## UINT32  Gs, Fs, Es, Ds, Cs, Ss;
## NOTE - modified segment registers could hang the debugger...  We
##        could attempt to insulate ourselves against this possibility,
##        but that poses risks as well.
##
  popl    %gs
  popl    %fs
  popl    %es
  popl    %ds
  popl    16(%ebp)
  popl    %ss

## UINT32  Cr0, Cr1, Cr2, Cr3, Cr4;
  popl    %eax
  movl    %eax, %cr0
  addl    $4,%esp   # not for Cr1
  popl    %eax
  movl    %eax, %cr2
  popl    %eax
  movl    %eax, %cr3
  popl    %eax
  movl    %eax, %cr4

## UINT32  Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;
  popl    %edi
  popl    %esi
  addl    $4,%esp  # not for ebp
  addl    $4,%esp  # not for esp
  popl    %edx
  popl    %ecx
  popl    %ebx
  popl    %eax

  movl    %ebp,%esp
  popl    %ebp
  addl    $8,%esp   # skip eax
  iretl