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1 | #------------------------------------------------------------------------------ | |
2 | #* | |
3 | #* Copyright 2006 - 2009, Intel Corporation | |
4 | #* All rights reserved. This program and the accompanying materials | |
5 | #* are licensed and made available under the terms and conditions of the BSD License | |
6 | #* which accompanies this distribution. The full text of the license may be found at | |
7 | #* http://opensource.org/licenses/bsd-license.php | |
8 | #* | |
9 | #* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
10 | #* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
11 | #* | |
12 | #* CpuAsm.S | |
13 | #* | |
14 | #* Abstract: | |
15 | #* | |
16 | #------------------------------------------------------------------------------ | |
17 | ||
18 | ||
19 | #.MMX | |
20 | #.XMM | |
21 | ||
22 | #EXTRN ASM_PFX(mErrorCodeFlag):DWORD # Error code flags for exceptions | |
23 | ||
24 | ||
25 | # | |
26 | # point to the external interrupt vector table | |
27 | # | |
28 | ExternalVectorTablePtr: | |
29 | .byte 0, 0, 0, 0 | |
30 | ||
31 | ASM_GLOBAL ASM_PFX(InitializeExternalVectorTablePtr) | |
32 | ASM_PFX(InitializeExternalVectorTablePtr): | |
33 | movl 4(%esp), %eax | |
34 | movl %eax, ExternalVectorTablePtr | |
35 | ret | |
36 | ||
37 | #------------------------------------------------------------------------------ | |
38 | # VOID | |
39 | # SetCodeSelector ( | |
40 | # UINT16 Selector | |
41 | # ); | |
42 | #------------------------------------------------------------------------------ | |
43 | ASM_GLOBAL ASM_PFX(SetCodeSelector) | |
44 | ASM_PFX(SetCodeSelector): | |
45 | movl 4(%esp), %ecx | |
46 | subl $0x10, %esp | |
47 | leal setCodeSelectorLongJump, %eax | |
48 | movl %eax, (%esp) | |
49 | movw %cx, 4(%esp) | |
50 | .byte 0xFF, 0x2C, 0x24 # jmp *(%esp) note:(FWORD jmp) | |
51 | setCodeSelectorLongJump: | |
52 | addl $0x10, %esp | |
53 | ret | |
54 | ||
55 | #------------------------------------------------------------------------------ | |
56 | # VOID | |
57 | # SetDataSelectors ( | |
58 | # UINT16 Selector | |
59 | # ); | |
60 | #------------------------------------------------------------------------------ | |
61 | ASM_GLOBAL ASM_PFX(SetDataSelectors) | |
62 | ASM_PFX(SetDataSelectors): | |
63 | movl 4(%esp), %ecx | |
64 | movw %cx, %ss | |
65 | movw %cx, %ds | |
66 | movw %cx, %es | |
67 | movw %cx, %fs | |
68 | movw %cx, %gs | |
69 | ret | |
70 | ||
71 | #---------------------------------------; | |
72 | # CommonInterruptEntry ; | |
73 | #---------------------------------------; | |
74 | # The follow algorithm is used for the common interrupt routine. | |
75 | ||
76 | ASM_GLOBAL ASM_PFX(CommonInterruptEntry) | |
77 | ASM_PFX(CommonInterruptEntry): | |
78 | cli | |
79 | # | |
80 | # All interrupt handlers are invoked through interrupt gates, so | |
81 | # IF flag automatically cleared at the entry point | |
82 | # | |
83 | ||
84 | # | |
85 | # Calculate vector number | |
86 | # | |
87 | # Get the return address of call, actually, it is the | |
88 | # address of vector number. | |
89 | # | |
90 | xchgl (%esp), %ecx | |
91 | movw (%ecx), %cx | |
92 | andl $0x0FFFF, %ecx | |
93 | cmpl $32, %ecx # Intel reserved vector for exceptions? | |
94 | jae NoErrorCode | |
95 | bt %ecx, ASM_PFX(mErrorCodeFlag) | |
96 | jc HasErrorCode | |
97 | ||
98 | NoErrorCode: | |
99 | ||
100 | # | |
101 | # Stack: | |
102 | # +---------------------+ | |
103 | # + EFlags + | |
104 | # +---------------------+ | |
105 | # + CS + | |
106 | # +---------------------+ | |
107 | # + EIP + | |
108 | # +---------------------+ | |
109 | # + ECX + | |
110 | # +---------------------+ <-- ESP | |
111 | # | |
112 | # Registers: | |
113 | # ECX - Vector Number | |
114 | # | |
115 | ||
116 | # | |
117 | # Put Vector Number on stack | |
118 | # | |
119 | pushl %ecx | |
120 | ||
121 | # | |
122 | # Put 0 (dummy) error code on stack, and restore ECX | |
123 | # | |
124 | xorl %ecx, %ecx # ECX = 0 | |
125 | xchgl 4(%esp), %ecx | |
126 | ||
127 | jmp ErrorCodeAndVectorOnStack | |
128 | ||
129 | HasErrorCode: | |
130 | ||
131 | # | |
132 | # Stack: | |
133 | # +---------------------+ | |
134 | # + EFlags + | |
135 | # +---------------------+ | |
136 | # + CS + | |
137 | # +---------------------+ | |
138 | # + EIP + | |
139 | # +---------------------+ | |
140 | # + Error Code + | |
141 | # +---------------------+ | |
142 | # + ECX + | |
143 | # +---------------------+ <-- ESP | |
144 | # | |
145 | # Registers: | |
146 | # ECX - Vector Number | |
147 | # | |
148 | ||
149 | # | |
150 | # Put Vector Number on stack and restore ECX | |
151 | # | |
152 | xchgl (%esp), %ecx | |
153 | ||
154 | # | |
155 | # Fall through to join main routine code | |
156 | # at ErrorCodeAndVectorOnStack | |
157 | # | |
158 | CommonInterruptEntry_al_0000: | |
159 | jmp CommonInterruptEntry_al_0000 | |
160 | ||
161 | ErrorCodeAndVectorOnStack: | |
162 | pushl %ebp | |
163 | movl %esp, %ebp | |
164 | ||
165 | # | |
166 | # Stack: | |
167 | # +---------------------+ | |
168 | # + EFlags + | |
169 | # +---------------------+ | |
170 | # + CS + | |
171 | # +---------------------+ | |
172 | # + EIP + | |
173 | # +---------------------+ | |
174 | # + Error Code + | |
175 | # +---------------------+ | |
176 | # + Vector Number + | |
177 | # +---------------------+ | |
178 | # + EBP + | |
179 | # +---------------------+ <-- EBP | |
180 | # | |
181 | ||
182 | # | |
183 | # Align stack to make sure that EFI_FX_SAVE_STATE_IA32 of EFI_SYSTEM_CONTEXT_IA32 | |
184 | # is 16-byte aligned | |
185 | # | |
186 | andl $0x0fffffff0, %esp | |
187 | subl $12, %esp | |
188 | ||
189 | #; UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax; | |
190 | pushl %eax | |
191 | pushl %ecx | |
192 | pushl %edx | |
193 | pushl %ebx | |
194 | leal 24(%ebp), %ecx | |
195 | pushl %ecx # ESP | |
196 | pushl (%ebp) # EBP | |
197 | pushl %esi | |
198 | pushl %edi | |
199 | ||
200 | #; UINT32 Gs, Fs, Es, Ds, Cs, Ss; | |
201 | movl %ss, %eax | |
202 | pushl %eax | |
203 | movzwl 16(%ebp), %eax | |
204 | pushl %eax | |
205 | movl %ds, %eax | |
206 | pushl %eax | |
207 | movl %es, %eax | |
208 | pushl %eax | |
209 | movl %fs, %eax | |
210 | pushl %eax | |
211 | movl %gs, %eax | |
212 | pushl %eax | |
213 | ||
214 | #; UINT32 Eip; | |
215 | movl 12(%ebp), %eax | |
216 | pushl %eax | |
217 | ||
218 | #; UINT32 Gdtr[2], Idtr[2]; | |
219 | subl $8, %esp | |
220 | sidt (%esp) | |
221 | movl 2(%esp), %eax | |
222 | xchgl (%esp), %eax | |
223 | andl $0x0FFFF, %eax | |
224 | movl %eax, 4(%esp) | |
225 | ||
226 | subl $8, %esp | |
227 | sgdt (%esp) | |
228 | movl 2(%esp), %eax | |
229 | xchgl (%esp), %eax | |
230 | andl $0x0FFFF, %eax | |
231 | movl %eax, 4(%esp) | |
232 | ||
233 | #; UINT32 Ldtr, Tr; | |
234 | xorl %eax, %eax | |
235 | str %ax | |
236 | pushl %eax | |
237 | sldt %ax | |
238 | pushl %eax | |
239 | ||
240 | #; UINT32 EFlags; | |
241 | movl 20(%ebp), %eax | |
242 | pushl %eax | |
243 | ||
244 | #; UINT32 Cr0, Cr1, Cr2, Cr3, Cr4; | |
245 | movl %cr4, %eax | |
246 | orl $0x208, %eax | |
247 | movl %eax, %cr4 | |
248 | pushl %eax | |
249 | movl %cr3, %eax | |
250 | pushl %eax | |
251 | movl %cr2, %eax | |
252 | pushl %eax | |
253 | xorl %eax, %eax | |
254 | pushl %eax | |
255 | movl %cr0, %eax | |
256 | pushl %eax | |
257 | ||
258 | #; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7; | |
259 | movl %dr7, %eax | |
260 | pushl %eax | |
261 | #; clear Dr7 while executing debugger itself | |
262 | xorl %eax, %eax | |
263 | movl %eax, %dr7 | |
264 | ||
265 | movl %dr6, %eax | |
266 | pushl %eax | |
267 | #; insure all status bits in dr6 are clear... | |
268 | xorl %eax, %eax | |
269 | movl %eax, %dr6 | |
270 | ||
271 | movl %dr3, %eax | |
272 | pushl %eax | |
273 | movl %dr2, %eax | |
274 | pushl %eax | |
275 | movl %dr1, %eax | |
276 | pushl %eax | |
277 | movl %dr0, %eax | |
278 | pushl %eax | |
279 | ||
280 | #; FX_SAVE_STATE_IA32 FxSaveState; | |
281 | subl $512, %esp | |
282 | movl %esp, %edi | |
283 | .byte 0x0f, 0x0ae, 0x07 #fxsave [edi] | |
284 | ||
285 | #; UINT32 ExceptionData; | |
286 | pushl 8(%ebp) | |
287 | ||
288 | #; call into exception handler | |
289 | movl ExternalVectorTablePtr, %eax # get the interrupt vectors base | |
290 | orl %eax, %eax # NULL? | |
291 | jz nullExternalExceptionHandler | |
292 | ||
293 | mov 4(%ebp), %ecx | |
294 | movl (%eax,%ecx,4), %eax | |
295 | orl %eax, %eax # NULL? | |
296 | jz nullExternalExceptionHandler | |
297 | ||
298 | #; Prepare parameter and call | |
299 | movl %esp, %edx | |
300 | pushl %edx | |
301 | movl 4(%ebp), %edx | |
302 | pushl %edx | |
303 | ||
304 | # | |
305 | # Call External Exception Handler | |
306 | # | |
307 | call *%eax | |
308 | addl $8, %esp | |
309 | ||
310 | nullExternalExceptionHandler: | |
311 | ||
312 | cli | |
313 | #; UINT32 ExceptionData; | |
314 | addl $4, %esp | |
315 | ||
316 | #; FX_SAVE_STATE_IA32 FxSaveState; | |
317 | movl %esp, %esi | |
318 | .byte 0x0f, 0x0ae, 0x0e # fxrstor [esi] | |
319 | addl $512, %esp | |
320 | ||
321 | #; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7; | |
322 | popl %eax | |
323 | movl %eax, %dr0 | |
324 | popl %eax | |
325 | movl %eax, %dr1 | |
326 | popl %eax | |
327 | movl %eax, %dr2 | |
328 | popl %eax | |
329 | movl %eax, %dr3 | |
330 | #; skip restore of dr6. We cleared dr6 during the context save. | |
331 | addl $4, %esp | |
332 | popl %eax | |
333 | movl %eax, %dr7 | |
334 | ||
335 | #; UINT32 Cr0, Cr1, Cr2, Cr3, Cr4; | |
336 | popl %eax | |
337 | movl %eax, %cr0 | |
338 | addl $4, %esp # not for Cr1 | |
339 | popl %eax | |
340 | movl %eax, %cr2 | |
341 | popl %eax | |
342 | movl %eax, %cr3 | |
343 | popl %eax | |
344 | movl %eax, %cr4 | |
345 | ||
346 | #; UINT32 EFlags; | |
347 | popl 20(%ebp) | |
348 | ||
349 | #; UINT32 Ldtr, Tr; | |
350 | #; UINT32 Gdtr[2], Idtr[2]; | |
351 | #; Best not let anyone mess with these particular registers... | |
352 | addl $24, %esp | |
353 | ||
354 | #; UINT32 Eip; | |
355 | popl 12(%ebp) | |
356 | ||
357 | #; UINT32 Gs, Fs, Es, Ds, Cs, Ss; | |
358 | #; NOTE - modified segment registers could hang the debugger... We | |
359 | #; could attempt to insulate ourselves against this possibility, | |
360 | #; but that poses risks as well. | |
361 | #; | |
362 | popl %gs | |
363 | popl %fs | |
364 | popl %es | |
365 | popl %ds | |
366 | popl 16(%ebp) | |
367 | popl %ss | |
368 | ||
369 | #; UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax; | |
370 | popl %edi | |
371 | popl %esi | |
372 | addl $4, %esp # not for ebp | |
373 | addl $4, %esp # not for esp | |
374 | popl %ebx | |
375 | popl %edx | |
376 | popl %ecx | |
377 | popl %eax | |
378 | ||
379 | movl %ebp, %esp | |
380 | popl %ebp | |
381 | addl $8, %esp | |
382 | iretl | |
383 | ||
384 | ||
385 | #END | |
386 |