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1 | ;/** @file\r | |
2 | ; Low leve IA32 specific debug support functions.\r | |
3 | ;\r | |
4 | ; Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>\r | |
5 | ; This program and the accompanying materials\r | |
6 | ; are licensed and made available under the terms and conditions of the BSD License\r | |
7 | ; which accompanies this distribution. The full text of the license may be found at\r | |
8 | ; http://opensource.org/licenses/bsd-license.php\r | |
9 | ;\r | |
10 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | ;\r | |
13 | ;**/\r | |
14 | \r | |
15 | .586p\r | |
16 | .MODEL FLAT, C\r | |
17 | \r | |
18 | EXCPT32_DIVIDE_ERROR EQU 0\r | |
19 | EXCPT32_DEBUG EQU 1\r | |
20 | EXCPT32_NMI EQU 2\r | |
21 | EXCPT32_BREAKPOINT EQU 3\r | |
22 | EXCPT32_OVERFLOW EQU 4\r | |
23 | EXCPT32_BOUND EQU 5\r | |
24 | EXCPT32_INVALID_OPCODE EQU 6\r | |
25 | EXCPT32_DOUBLE_FAULT EQU 8\r | |
26 | EXCPT32_INVALID_TSS EQU 10\r | |
27 | EXCPT32_SEG_NOT_PRESENT EQU 11\r | |
28 | EXCPT32_STACK_FAULT EQU 12\r | |
29 | EXCPT32_GP_FAULT EQU 13\r | |
30 | EXCPT32_PAGE_FAULT EQU 14\r | |
31 | EXCPT32_FP_ERROR EQU 16\r | |
32 | EXCPT32_ALIGNMENT_CHECK EQU 17\r | |
33 | EXCPT32_MACHINE_CHECK EQU 18\r | |
34 | EXCPT32_SIMD EQU 19\r | |
35 | \r | |
36 | FXSTOR_FLAG EQU 01000000h ; bit cpuid 24 of feature flags\r | |
37 | \r | |
38 | ;; The FXSTOR and FXRSTOR commands are used for saving and restoring the x87,\r | |
39 | ;; MMX, SSE, SSE2, etc registers. The initialization of the debugsupport driver\r | |
40 | ;; MUST check the CPUID feature flags to see that these instructions are available\r | |
41 | ;; and fail to init if they are not.\r | |
42 | \r | |
43 | ;; fxstor [edi]\r | |
44 | FXSTOR_EDI MACRO\r | |
45 | db 0fh, 0aeh, 00000111y ; mod = 00, reg/op = 000, r/m = 111 = [edi]\r | |
46 | ENDM\r | |
47 | \r | |
48 | ;; fxrstor [esi]\r | |
49 | FXRSTOR_ESI MACRO\r | |
50 | db 0fh, 0aeh, 00001110y ; mod = 00, reg/op = 001, r/m = 110 = [esi]\r | |
51 | ENDM\r | |
52 | .DATA\r | |
53 | \r | |
54 | public OrigVector, InterruptEntryStub, StubSize, CommonIdtEntry, FxStorSupport\r | |
55 | \r | |
56 | StubSize dd InterruptEntryStubEnd - InterruptEntryStub\r | |
57 | AppEsp dd 11111111h ; ?\r | |
58 | DebugEsp dd 22222222h ; ?\r | |
59 | ExtraPush dd 33333333h ; ?\r | |
60 | ExceptData dd 44444444h ; ?\r | |
61 | Eflags dd 55555555h ; ?\r | |
62 | OrigVector dd 66666666h ; ?\r | |
63 | \r | |
64 | ;; The declarations below define the memory region that will be used for the debug stack.\r | |
65 | ;; The context record will be built by pushing register values onto this stack.\r | |
66 | ;; It is imparitive that alignment be carefully managed, since the FXSTOR and\r | |
67 | ;; FXRSTOR instructions will GP fault if their memory operand is not 16 byte aligned.\r | |
68 | ;;\r | |
69 | ;; The stub will switch stacks from the application stack to the debuger stack\r | |
70 | ;; and pushes the exception number.\r | |
71 | ;;\r | |
72 | ;; Then we building the context record on the stack. Since the stack grows down,\r | |
73 | ;; we push the fields of the context record from the back to the front. There\r | |
74 | ;; are 132 bytes of stack used prior allocating the 512 bytes of stack to be\r | |
75 | ;; used as the memory buffer for the fxstor instruction. Therefore address of\r | |
76 | ;; the buffer used for the FXSTOR instruction is &Eax - 132 - 512, which\r | |
77 | ;; must be 16 byte aligned.\r | |
78 | ;;\r | |
79 | ;; We carefully locate the stack to make this happen.\r | |
80 | ;;\r | |
81 | ;; For reference, the context structure looks like this:\r | |
82 | ;; struct {\r | |
83 | ;; UINT32 ExceptionData;\r | |
84 | ;; FX_SAVE_STATE_IA32 FxSaveState; // 512 bytes, must be 16 byte aligned\r | |
85 | ;; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;\r | |
86 | ;; UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;\r | |
87 | ;; UINT32 EFlags;\r | |
88 | ;; UINT32 Ldtr, Tr;\r | |
89 | ;; UINT32 Gdtr[2], Idtr[2];\r | |
90 | ;; UINT32 Eip;\r | |
91 | ;; UINT32 Gs, Fs, Es, Ds, Cs, Ss;\r | |
92 | ;; UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;\r | |
93 | ;; } SYSTEM_CONTEXT_IA32; // 32 bit system context record\r | |
94 | \r | |
95 | \r | |
96 | align 16\r | |
97 | DebugStackEnd db "DbgStkEnd >>>>>>" ;; 16 byte long string - must be 16 bytes to preserve alignment\r | |
98 | dd 1ffdh dup (000000000h) ;; 32K should be enough stack\r | |
99 | ;; This allocation is coocked to insure\r | |
100 | ;; that the the buffer for the FXSTORE instruction\r | |
101 | ;; will be 16 byte aligned also.\r | |
102 | ;;\r | |
103 | ExceptionNumber dd ? ;; first entry will be the vector number pushed by the stub\r | |
104 | \r | |
105 | DebugStackBegin db "<<<< DbgStkBegin" ;; initial debug ESP == DebugStackBegin, set in stub\r | |
106 | \r | |
107 | .CODE\r | |
108 | \r | |
109 | externdef InterruptDistrubutionHub:near\r | |
110 | \r | |
111 | ;------------------------------------------------------------------------------\r | |
112 | ; BOOLEAN\r | |
113 | ; FxStorSupport (\r | |
114 | ; void\r | |
115 | ; )\r | |
116 | ;\r | |
117 | ; Abstract: Returns TRUE if FxStor instructions are supported\r | |
118 | ;\r | |
119 | FxStorSupport PROC C PUBLIC\r | |
120 | \r | |
121 | ;\r | |
122 | ; cpuid corrupts ebx which must be preserved per the C calling convention\r | |
123 | ;\r | |
124 | push ebx\r | |
125 | mov eax, 1\r | |
126 | cpuid\r | |
127 | mov eax, edx\r | |
128 | and eax, FXSTOR_FLAG\r | |
129 | shr eax, 24\r | |
130 | pop ebx\r | |
131 | ret\r | |
132 | FxStorSupport ENDP\r | |
133 | \r | |
134 | \r | |
135 | \r | |
136 | ;------------------------------------------------------------------------------\r | |
137 | ; void\r | |
138 | ; Vect2Desc (\r | |
139 | ; DESCRIPTOR * DestDesc,\r | |
140 | ; void (*Vector) (void)\r | |
141 | ; )\r | |
142 | ;\r | |
143 | ; Abstract: Encodes an IDT descriptor with the given physical address\r | |
144 | ;\r | |
145 | Vect2Desc PROC C PUBLIC DestPtr:DWORD, Vector:DWORD\r | |
146 | \r | |
147 | mov eax, Vector\r | |
148 | mov ecx, DestPtr\r | |
149 | mov word ptr [ecx], ax ; write bits 15..0 of offset\r | |
150 | mov dx, cs\r | |
151 | mov word ptr [ecx+2], dx ; SYS_CODE_SEL from GDT\r | |
152 | mov word ptr [ecx+4], 0e00h OR 8000h ; type = 386 interrupt gate, present\r | |
153 | shr eax, 16\r | |
154 | mov word ptr [ecx+6], ax ; write bits 31..16 of offset\r | |
155 | \r | |
156 | ret\r | |
157 | \r | |
158 | Vect2Desc ENDP\r | |
159 | \r | |
160 | \r | |
161 | \r | |
162 | ;------------------------------------------------------------------------------\r | |
163 | ; InterruptEntryStub\r | |
164 | ;\r | |
165 | ; Abstract: This code is not a function, but is a small piece of code that is\r | |
166 | ; copied and fixed up once for each IDT entry that is hooked.\r | |
167 | ;\r | |
168 | InterruptEntryStub::\r | |
169 | mov AppEsp, esp ; save stack top\r | |
170 | mov esp, offset DebugStackBegin ; switch to debugger stack\r | |
171 | push 0 ; push vector number - will be modified before installed\r | |
172 | db 0e9h ; jump rel32\r | |
173 | dd 0 ; fixed up to relative address of CommonIdtEntry\r | |
174 | InterruptEntryStubEnd:\r | |
175 | \r | |
176 | \r | |
177 | \r | |
178 | ;------------------------------------------------------------------------------\r | |
179 | ; CommonIdtEntry\r | |
180 | ;\r | |
181 | ; Abstract: This code is not a function, but is the common part for all IDT\r | |
182 | ; vectors.\r | |
183 | ;\r | |
184 | CommonIdtEntry::\r | |
185 | ;;\r | |
186 | ;; At this point, the stub has saved the current application stack esp into AppEsp\r | |
187 | ;; and switched stacks to the debug stack, where it pushed the vector number\r | |
188 | ;;\r | |
189 | ;; The application stack looks like this:\r | |
190 | ;;\r | |
191 | ;; ...\r | |
192 | ;; (last application stack entry)\r | |
193 | ;; eflags from interrupted task\r | |
194 | ;; CS from interrupted task\r | |
195 | ;; EIP from interrupted task\r | |
196 | ;; Error code <-------------------- Only present for some exeption types\r | |
197 | ;;\r | |
198 | ;;\r | |
199 | \r | |
200 | \r | |
201 | ;; The stub switched us to the debug stack and pushed the interrupt number.\r | |
202 | ;;\r | |
203 | ;; Next, construct the context record. It will be build on the debug stack by\r | |
204 | ;; pushing the registers in the correct order so as to create the context structure\r | |
205 | ;; on the debug stack. The context record must be built from the end back to the\r | |
206 | ;; beginning because the stack grows down...\r | |
207 | ;\r | |
208 | ;; For reference, the context record looks like this:\r | |
209 | ;;\r | |
210 | ;; typedef\r | |
211 | ;; struct {\r | |
212 | ;; UINT32 ExceptionData;\r | |
213 | ;; FX_SAVE_STATE_IA32 FxSaveState;\r | |
214 | ;; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;\r | |
215 | ;; UINT32 Cr0, Cr2, Cr3, Cr4;\r | |
216 | ;; UINT32 EFlags;\r | |
217 | ;; UINT32 Ldtr, Tr;\r | |
218 | ;; UINT32 Gdtr[2], Idtr[2];\r | |
219 | ;; UINT32 Eip;\r | |
220 | ;; UINT32 Gs, Fs, Es, Ds, Cs, Ss;\r | |
221 | ;; UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;\r | |
222 | ;; } SYSTEM_CONTEXT_IA32; // 32 bit system context record\r | |
223 | \r | |
224 | ;; UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;\r | |
225 | pushad\r | |
226 | \r | |
227 | ;; Save interrupt state eflags register...\r | |
228 | pushfd\r | |
229 | pop eax\r | |
230 | mov dword ptr Eflags, eax\r | |
231 | \r | |
232 | ;; We need to determine if any extra data was pushed by the exception, and if so, save it\r | |
233 | ;; To do this, we check the exception number pushed by the stub, and cache the\r | |
234 | ;; result in a variable since we'll need this again.\r | |
235 | .IF ExceptionNumber == EXCPT32_DOUBLE_FAULT\r | |
236 | mov ExtraPush, 1\r | |
237 | .ELSEIF ExceptionNumber == EXCPT32_INVALID_TSS\r | |
238 | mov ExtraPush, 1\r | |
239 | .ELSEIF ExceptionNumber == EXCPT32_SEG_NOT_PRESENT\r | |
240 | mov ExtraPush, 1\r | |
241 | .ELSEIF ExceptionNumber == EXCPT32_STACK_FAULT\r | |
242 | mov ExtraPush, 1\r | |
243 | .ELSEIF ExceptionNumber == EXCPT32_GP_FAULT\r | |
244 | mov ExtraPush, 1\r | |
245 | .ELSEIF ExceptionNumber == EXCPT32_PAGE_FAULT\r | |
246 | mov ExtraPush, 1\r | |
247 | .ELSEIF ExceptionNumber == EXCPT32_ALIGNMENT_CHECK\r | |
248 | mov ExtraPush, 1\r | |
249 | .ELSE\r | |
250 | mov ExtraPush, 0\r | |
251 | .ENDIF\r | |
252 | \r | |
253 | ;; If there's some extra data, save it also, and modify the saved AppEsp to effectively\r | |
254 | ;; pop this value off the application's stack.\r | |
255 | .IF ExtraPush == 1\r | |
256 | mov eax, AppEsp\r | |
257 | mov ebx, [eax]\r | |
258 | mov ExceptData, ebx\r | |
259 | add eax, 4\r | |
260 | mov AppEsp, eax\r | |
261 | .ELSE\r | |
262 | mov ExceptData, 0\r | |
263 | .ENDIF\r | |
264 | \r | |
265 | ;; The "pushad" above pushed the debug stack esp. Since what we're actually doing\r | |
266 | ;; is building the context record on the debug stack, we need to save the pushed\r | |
267 | ;; debug ESP, and replace it with the application's last stack entry...\r | |
268 | mov eax, [esp + 12]\r | |
269 | mov DebugEsp, eax\r | |
270 | mov eax, AppEsp\r | |
271 | add eax, 12\r | |
272 | ; application stack has eflags, cs, & eip, so\r | |
273 | ; last actual application stack entry is\r | |
274 | ; 12 bytes into the application stack.\r | |
275 | mov [esp + 12], eax\r | |
276 | \r | |
277 | ;; continue building context record\r | |
278 | ;; UINT32 Gs, Fs, Es, Ds, Cs, Ss; insure high 16 bits of each is zero\r | |
279 | mov eax, ss\r | |
280 | push eax\r | |
281 | \r | |
282 | ; CS from application is one entry back in application stack\r | |
283 | mov eax, AppEsp\r | |
284 | movzx eax, word ptr [eax + 4]\r | |
285 | push eax\r | |
286 | \r | |
287 | mov eax, ds\r | |
288 | push eax\r | |
289 | mov eax, es\r | |
290 | push eax\r | |
291 | mov eax, fs\r | |
292 | push eax\r | |
293 | mov eax, gs\r | |
294 | push eax\r | |
295 | \r | |
296 | ;; UINT32 Eip;\r | |
297 | ; Eip from application is on top of application stack\r | |
298 | mov eax, AppEsp\r | |
299 | push dword ptr [eax]\r | |
300 | \r | |
301 | ;; UINT32 Gdtr[2], Idtr[2];\r | |
302 | push 0\r | |
303 | push 0\r | |
304 | sidt fword ptr [esp]\r | |
305 | push 0\r | |
306 | push 0\r | |
307 | sgdt fword ptr [esp]\r | |
308 | \r | |
309 | ;; UINT32 Ldtr, Tr;\r | |
310 | xor eax, eax\r | |
311 | str ax\r | |
312 | push eax\r | |
313 | sldt ax\r | |
314 | push eax\r | |
315 | \r | |
316 | ;; UINT32 EFlags;\r | |
317 | ;; Eflags from application is two entries back in application stack\r | |
318 | mov eax, AppEsp\r | |
319 | push dword ptr [eax + 8]\r | |
320 | \r | |
321 | ;; UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;\r | |
322 | ;; insure FXSAVE/FXRSTOR is enabled in CR4...\r | |
323 | ;; ... while we're at it, make sure DE is also enabled...\r | |
324 | mov eax, cr4\r | |
325 | or eax, 208h\r | |
326 | mov cr4, eax\r | |
327 | push eax\r | |
328 | mov eax, cr3\r | |
329 | push eax\r | |
330 | mov eax, cr2\r | |
331 | push eax\r | |
332 | push 0\r | |
333 | mov eax, cr0\r | |
334 | push eax\r | |
335 | \r | |
336 | ;; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;\r | |
337 | mov eax, dr7\r | |
338 | push eax\r | |
339 | ;; clear Dr7 while executing debugger itself\r | |
340 | xor eax, eax\r | |
341 | mov dr7, eax\r | |
342 | \r | |
343 | mov eax, dr6\r | |
344 | push eax\r | |
345 | ;; insure all status bits in dr6 are clear...\r | |
346 | xor eax, eax\r | |
347 | mov dr6, eax\r | |
348 | \r | |
349 | mov eax, dr3\r | |
350 | push eax\r | |
351 | mov eax, dr2\r | |
352 | push eax\r | |
353 | mov eax, dr1\r | |
354 | push eax\r | |
355 | mov eax, dr0\r | |
356 | push eax\r | |
357 | \r | |
358 | ;; FX_SAVE_STATE_IA32 FxSaveState;\r | |
359 | sub esp, 512\r | |
360 | mov edi, esp\r | |
361 | ; IMPORTANT!! The debug stack has been carefully constructed to\r | |
362 | ; insure that esp and edi are 16 byte aligned when we get here.\r | |
363 | ; They MUST be. If they are not, a GP fault will occur.\r | |
364 | FXSTOR_EDI\r | |
365 | \r | |
366 | ;; UEFI calling convention for IA32 requires that Direction flag in EFLAGs is clear\r | |
367 | cld\r | |
368 | \r | |
369 | ;; UINT32 ExceptionData;\r | |
370 | mov eax, ExceptData\r | |
371 | push eax\r | |
372 | \r | |
373 | ; call to C code which will in turn call registered handler\r | |
374 | ; pass in the vector number\r | |
375 | mov eax, esp\r | |
376 | push eax\r | |
377 | mov eax, ExceptionNumber\r | |
378 | push eax\r | |
379 | call InterruptDistrubutionHub\r | |
380 | add esp, 8\r | |
381 | \r | |
382 | ; restore context...\r | |
383 | ;; UINT32 ExceptionData;\r | |
384 | add esp, 4\r | |
385 | \r | |
386 | ;; FX_SAVE_STATE_IA32 FxSaveState;\r | |
387 | mov esi, esp\r | |
388 | FXRSTOR_ESI\r | |
389 | add esp, 512\r | |
390 | \r | |
391 | ;; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;\r | |
392 | pop eax\r | |
393 | mov dr0, eax\r | |
394 | pop eax\r | |
395 | mov dr1, eax\r | |
396 | pop eax\r | |
397 | mov dr2, eax\r | |
398 | pop eax\r | |
399 | mov dr3, eax\r | |
400 | ;; skip restore of dr6. We cleared dr6 during the context save.\r | |
401 | add esp, 4\r | |
402 | pop eax\r | |
403 | mov dr7, eax\r | |
404 | \r | |
405 | ;; UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;\r | |
406 | pop eax\r | |
407 | mov cr0, eax\r | |
408 | add esp, 4\r | |
409 | pop eax\r | |
410 | mov cr2, eax\r | |
411 | pop eax\r | |
412 | mov cr3, eax\r | |
413 | pop eax\r | |
414 | mov cr4, eax\r | |
415 | \r | |
416 | ;; UINT32 EFlags;\r | |
417 | mov eax, AppEsp\r | |
418 | pop dword ptr [eax + 8]\r | |
419 | \r | |
420 | ;; UINT32 Ldtr, Tr;\r | |
421 | ;; UINT32 Gdtr[2], Idtr[2];\r | |
422 | ;; Best not let anyone mess with these particular registers...\r | |
423 | add esp, 24\r | |
424 | \r | |
425 | ;; UINT32 Eip;\r | |
426 | pop dword ptr [eax]\r | |
427 | \r | |
428 | ;; UINT32 SegGs, SegFs, SegEs, SegDs, SegCs, SegSs;\r | |
429 | ;; NOTE - modified segment registers could hang the debugger... We\r | |
430 | ;; could attempt to insulate ourselves against this possibility,\r | |
431 | ;; but that poses risks as well.\r | |
432 | ;;\r | |
433 | \r | |
434 | pop gs\r | |
435 | pop fs\r | |
436 | pop es\r | |
437 | pop ds\r | |
438 | pop [eax + 4]\r | |
439 | pop ss\r | |
440 | \r | |
441 | ;; The next stuff to restore is the general purpose registers that were pushed\r | |
442 | ;; using the "pushad" instruction.\r | |
443 | ;;\r | |
444 | ;; The value of ESP as stored in the context record is the application ESP\r | |
445 | ;; including the 3 entries on the application stack caused by the exception\r | |
446 | ;; itself. It may have been modified by the debug agent, so we need to\r | |
447 | ;; determine if we need to relocate the application stack.\r | |
448 | \r | |
449 | mov ebx, [esp + 12] ; move the potentially modified AppEsp into ebx\r | |
450 | mov eax, AppEsp\r | |
451 | add eax, 12\r | |
452 | cmp ebx, eax\r | |
453 | je NoAppStackMove\r | |
454 | \r | |
455 | mov eax, AppEsp\r | |
456 | mov ecx, [eax] ; EIP\r | |
457 | mov [ebx], ecx\r | |
458 | \r | |
459 | mov ecx, [eax + 4] ; CS\r | |
460 | mov [ebx + 4], ecx\r | |
461 | \r | |
462 | mov ecx, [eax + 8] ; EFLAGS\r | |
463 | mov [ebx + 8], ecx\r | |
464 | \r | |
465 | mov eax, ebx ; modify the saved AppEsp to the new AppEsp\r | |
466 | mov AppEsp, eax\r | |
467 | NoAppStackMove:\r | |
468 | mov eax, DebugEsp ; restore the DebugEsp on the debug stack\r | |
469 | ; so our "popad" will not cause a stack switch\r | |
470 | mov [esp + 12], eax\r | |
471 | \r | |
472 | cmp ExceptionNumber, 068h\r | |
473 | jne NoChain\r | |
474 | \r | |
475 | Chain:\r | |
476 | \r | |
477 | ;; Restore eflags so when we chain, the flags will be exactly as if we were never here.\r | |
478 | ;; We gin up the stack to do an iretd so we can get ALL the flags.\r | |
479 | mov eax, AppEsp\r | |
480 | mov ebx, [eax + 8]\r | |
481 | and ebx, NOT 300h ; special handling for IF and TF\r | |
482 | push ebx\r | |
483 | push cs\r | |
484 | push PhonyIretd\r | |
485 | iretd\r | |
486 | PhonyIretd:\r | |
487 | \r | |
488 | ;; UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;\r | |
489 | popad\r | |
490 | \r | |
491 | ;; Switch back to application stack\r | |
492 | mov esp, AppEsp\r | |
493 | \r | |
494 | ;; Jump to original handler\r | |
495 | jmp OrigVector\r | |
496 | \r | |
497 | NoChain:\r | |
498 | ;; UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;\r | |
499 | popad\r | |
500 | \r | |
501 | ;; Switch back to application stack\r | |
502 | mov esp, AppEsp\r | |
503 | \r | |
504 | ;; We're outa here...\r | |
505 | iretd\r | |
506 | END\r | |
507 | \r | |
508 | \r | |
509 | \r |