projects / deliverable / binutils-gdb.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
import gdb-1999-12-06 snapshot
[deliverable/binutils-gdb.git] / sim / arm / armos.c
1 /* armos.c -- ARMulator OS interface: ARM6 Instruction Emulator.
2 Copyright (C) 1994 Advanced RISC Machines Ltd.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
17
18 /* This file contains a model of Demon, ARM Ltd's Debug Monitor,
19 including all the SWI's required to support the C library. The code in
20 it is not really for the faint-hearted (especially the abort handling
21 code), but it is a complete example. Defining NOOS will disable all the
22 fun, and definign VAILDATE will define SWI 1 to enter SVC mode, and SWI
23 0x11 to halt the emulator. */
24
25 #include "config.h"
26
27 #include <time.h>
28 #include <errno.h>
29 #include <string.h>
30 #include <fcntl.h>
31
32 #ifndef O_RDONLY
33 #define O_RDONLY 0
34 #endif
35 #ifndef O_WRONLY
36 #define O_WRONLY 1
37 #endif
38 #ifndef O_RDWR
39 #define O_RDWR 2
40 #endif
41 #ifndef O_BINARY
42 #define O_BINARY 0
43 #endif
44
45 #ifdef __STDC__
46 #define unlink(s) remove(s)
47 #endif
48
49 #ifdef HAVE_UNISTD_H
50 #include <unistd.h> /* For SEEK_SET etc */
51 #endif
52
53 #ifdef __riscos
54 extern int _fisatty(FILE *);
55 #define isatty_(f) _fisatty(f)
56 #else
57 #ifdef __ZTC__
58 #include <io.h>
59 #define isatty_(f) isatty((f)->_file)
60 #else
61 #ifdef macintosh
62 #include <ioctl.h>
63 #define isatty_(f) (~ioctl ((f)->_file, FIOINTERACTIVE, NULL))
64 #else
65 #define isatty_(f) isatty (fileno (f))
66 #endif
67 #endif
68 #endif
69
70 #include "armdefs.h"
71 #include "armos.h"
72 #ifndef NOOS
73 #ifndef VALIDATE
74 /* #ifndef ASIM */
75 #include "armfpe.h"
76 /* #endif */
77 #endif
78 #endif
79
80 /* For RDIError_BreakpointReached. */
81 #include "dbg_rdi.h"
82
83 extern unsigned ARMul_OSInit(ARMul_State *state) ;
84 extern void ARMul_OSExit(ARMul_State *state) ;
85 extern unsigned ARMul_OSHandleSWI(ARMul_State *state,ARMword number) ;
86 extern unsigned ARMul_OSException(ARMul_State *state, ARMword vector, ARMword pc) ;
87 extern ARMword ARMul_OSLastErrorP(ARMul_State *state) ;
88 extern ARMword ARMul_Debug(ARMul_State *state, ARMword pc, ARMword instr) ;
89
90 #define BUFFERSIZE 4096
91 #ifndef FOPEN_MAX
92 #define FOPEN_MAX 64
93 #endif
94 #define UNIQUETEMPS 256
95
96 #ifndef NOOS
97 static void UnwindDataAbort(ARMul_State *state, ARMword addr);
98 static void getstring(ARMul_State *state, ARMword from, char *to) ;
99 #endif
100
101 /***************************************************************************\
102 * OS private Information *
103 \***************************************************************************/
104
105 struct OSblock {
106 ARMword Time0 ;
107 ARMword ErrorP ;
108 ARMword ErrorNo ;
109 FILE *FileTable[FOPEN_MAX] ;
110 char FileFlags[FOPEN_MAX] ;
111 char *tempnames[UNIQUETEMPS] ;
112 } ;
113
114 #define NOOP 0
115 #define BINARY 1
116 #define READOP 2
117 #define WRITEOP 4
118
119 #ifdef macintosh
120 #define FIXCRLF(t,c) ((t & BINARY) ? \
121 c : \
122 ((c == '\n' || c == '\r' ) ? (c ^ 7) : c) \
123 )
124 #else
125 #define FIXCRLF(t,c) c
126 #endif
127
128 static ARMword softvectorcode[] =
129 { /* basic: swi tidyexception + event; mov pc, lr;
130 ldmia r11,{r11,pc}; swi generateexception + event
131 */
132 0xef000090, 0xe1a0e00f, 0xe89b8800, 0xef000080, /*Reset*/
133 0xef000091, 0xe1a0e00f, 0xe89b8800, 0xef000081, /*Undef*/
134 0xef000092, 0xe1a0e00f, 0xe89b8800, 0xef000082, /*SWI */
135 0xef000093, 0xe1a0e00f, 0xe89b8800, 0xef000083, /*Prefetch abort*/
136 0xef000094, 0xe1a0e00f, 0xe89b8800, 0xef000084, /*Data abort*/
137 0xef000095, 0xe1a0e00f, 0xe89b8800, 0xef000085, /*Address exception*/
138 0xef000096, 0xe1a0e00f, 0xe89b8800, 0xef000086, /*IRQ*/
139 0xef000097, 0xe1a0e00f, 0xe89b8800, 0xef000087, /*FIQ*/
140 0xef000098, 0xe1a0e00f, 0xe89b8800, 0xef000088, /*Error*/
141 0xe1a0f00e /* default handler */
142 };
143
144 /***************************************************************************\
145 * Time for the Operating System to initialise itself. *
146 \***************************************************************************/
147
148 unsigned
149 ARMul_OSInit (ARMul_State *state)
150 {
151 #ifndef NOOS
152 #ifndef VALIDATE
153 ARMword instr, i , j ;
154 struct OSblock* OSptr = (struct OSblock*)state->OSptr;
155
156 if (state->OSptr == NULL) {
157 state->OSptr = (unsigned char *)malloc(sizeof(struct OSblock));
158 if (state->OSptr == NULL) {
159 perror("OS Memory");
160 exit(15);
161 }
162 }
163 OSptr = (struct OSblock*)state->OSptr;
164 OSptr->ErrorP = 0;
165 state->Reg[13] = ADDRSUPERSTACK; /* set up a stack for the current mode */
166 ARMul_SetReg(state,SVC32MODE,13,ADDRSUPERSTACK); /* and for supervisor mode */
167 ARMul_SetReg(state,ABORT32MODE,13,ADDRSUPERSTACK); /* and for abort 32 mode */
168 ARMul_SetReg(state,UNDEF32MODE,13,ADDRSUPERSTACK); /* and for undef 32 mode */
169 instr = 0xe59ff000 | (ADDRSOFTVECTORS - 8); /* load pc from soft vector */
170 for (i = ARMul_ResetV ; i <= ARMFIQV ; i += 4)
171 ARMul_WriteWord(state, i, instr); /* write hardware vectors */
172 for (i = ARMul_ResetV ; i <= ARMFIQV + 4 ; i += 4) {
173 ARMul_WriteWord(state, ADDRSOFTVECTORS + i, SOFTVECTORCODE + i * 4);
174 ARMul_WriteWord(state, ADDRSOFHANDLERS + 2*i + 4L, SOFTVECTORCODE + sizeof(softvectorcode) - 4L);
175 }
176 for (i = 0 ; i < sizeof(softvectorcode) ; i += 4)
177 ARMul_WriteWord(state, SOFTVECTORCODE + i, softvectorcode[i/4]);
178 for (i = 0 ; i < FOPEN_MAX ; i++)
179 OSptr->FileTable[i] = NULL ;
180 for (i = 0 ; i < UNIQUETEMPS ; i++)
181 OSptr->tempnames[i] = NULL ;
182 ARMul_ConsolePrint (state, ", Demon 1.01");
183
184 /* #ifndef ASIM */
185
186 /* install fpe */
187 for (i = 0 ; i < fpesize ; i+=4) /* copy the code */
188 ARMul_WriteWord(state,FPESTART + i,fpecode[i >> 2]) ;
189 for (i = FPESTART + fpesize ; ; i-=4) { /* reverse the error strings */
190 if ((j = ARMul_ReadWord(state,i)) == 0xffffffff)
191 break ;
192 if (state->bigendSig && j < 0x80000000) { /* it's part of the string so swap it */
193 j = ((j >> 0x18) & 0x000000ff) |
194 ((j >> 0x08) & 0x0000ff00) |
195 ((j << 0x08) & 0x00ff0000) |
196 ((j << 0x18) & 0xff000000) ;
197 ARMul_WriteWord(state,i,j) ;
198 }
199 }
200 ARMul_WriteWord(state,FPEOLDVECT,ARMul_ReadWord(state,4)) ; /* copy old illegal instr vector */
201 ARMul_WriteWord(state,4,FPENEWVECT(ARMul_ReadWord(state,i-4))) ; /* install new vector */
202 ARMul_ConsolePrint (state, ", FPE") ;
203
204 /* #endif /* ASIM */
205 #endif /* VALIDATE */
206 #endif /* NOOS */
207
208 return(TRUE) ;
209 }
210
211 void
212 ARMul_OSExit (ARMul_State *state)
213 {
214 free((char *)state->OSptr);
215 }
216
217
218 /***************************************************************************\
219 * Return the last Operating System Error. *
220 \***************************************************************************/
221
222 ARMword
223 ARMul_OSLastErrorP (ARMul_State *state)
224 {
225 return ((struct OSblock *)state->OSptr)->ErrorP;
226 }
227
228 #if 1 /* CYGNUS LOCAL */
229 /* This is the cygnus way of doing it, which makes it simple to do our tests */
230
231 static int translate_open_mode[] =
232 {
233 O_RDONLY, /* "r" */
234 O_RDONLY+O_BINARY, /* "rb" */
235 O_RDWR, /* "r+" */
236 O_RDWR +O_BINARY, /* "r+b" */
237 O_WRONLY +O_CREAT+O_TRUNC, /* "w" */
238 O_WRONLY+O_BINARY+O_CREAT+O_TRUNC, /* "wb" */
239 O_RDWR +O_CREAT+O_TRUNC, /* "w+" */
240 O_RDWR +O_BINARY+O_CREAT+O_TRUNC, /* "w+b" */
241 O_WRONLY +O_APPEND+O_CREAT,/* "a" */
242 O_WRONLY+O_BINARY+O_APPEND+O_CREAT,/* "ab" */
243 O_RDWR +O_APPEND+O_CREAT,/* "a+" */
244 O_RDWR +O_BINARY+O_APPEND+O_CREAT /* "a+b" */
245 };
246
247 static void
248 SWIWrite0 (ARMul_State *state, ARMword addr)
249 {
250 ARMword temp;
251 struct OSblock* OSptr = (struct OSblock*) state->OSptr;
252
253 while ((temp = ARMul_ReadByte (state, addr++)) != 0)
254 (void) fputc ((char) temp, stdout);
255
256 OSptr->ErrorNo = errno;
257 }
258
259 static void
260 WriteCommandLineTo (ARMul_State *state, ARMword addr)
261 {
262 ARMword temp;
263 char *cptr = state->CommandLine;
264 if (cptr == NULL)
265 cptr = "\0";
266 do {
267 temp = (ARMword) *cptr++;
268 ARMul_WriteByte (state, addr++, temp);
269 } while (temp != 0);
270 }
271
272 static void
273 SWIopen (ARMul_State *state, ARMword name, ARMword SWIflags)
274 {
275 struct OSblock* OSptr = (struct OSblock*)state->OSptr;
276 char dummy[2000];
277 int flags;
278 int i;
279
280 for (i = 0;
281 dummy[i] = ARMul_ReadByte (state, name + i);
282 i++)
283 ;
284
285 /* Now we need to decode the Demon open mode */
286 flags = translate_open_mode[SWIflags];
287
288 /* Filename ":tt" is special: it denotes stdin/out */
289 if (strcmp (dummy, ":tt") == 0)
290 {
291 if (flags == O_RDONLY) /* opening tty "r" */
292 state->Reg[0] = 0; /* stdin */
293 else
294 state->Reg[0] = 1; /* stdout */
295 }
296 else
297 {
298 state->Reg[0] = (int) open (dummy, flags, 0666);
299 OSptr->ErrorNo = errno;
300 }
301 }
302
303 static void
304 SWIread (ARMul_State *state, ARMword f, ARMword ptr, ARMword len)
305 {
306 struct OSblock* OSptr = (struct OSblock*) state->OSptr;
307 int res;
308 int i;
309 char *local = malloc (len);
310
311 if (local == NULL)
312 {
313 fprintf (stderr, "sim: Unable to read 0x%x bytes - out of memory\n", len);
314 return;
315 }
316
317 res = read (f, local, len);
318 if (res > 0)
319 for (i = 0; i < res; i++)
320 ARMul_WriteByte (state, ptr + i, local[i]);
321 free (local);
322 state->Reg[0] = res == -1 ? -1 : len - res;
323 OSptr->ErrorNo = errno;
324 }
325
326 static void
327 SWIwrite (ARMul_State *state, ARMword f, ARMword ptr, ARMword len)
328 {
329 struct OSblock* OSptr = (struct OSblock*) state->OSptr;
330 int res;
331 int i;
332 char *local = malloc (len);
333
334 if (local == NULL)
335 {
336 fprintf (stderr, "sim: Unable to write 0x%x bytes - out of memory\n", len);
337 return;
338 }
339
340 for (i = 0; i < len; i++)
341 local[i] = ARMul_ReadByte (state, ptr + i);
342
343 res = write (f, local, len);
344 state->Reg[0] = res == -1 ? -1 : len - res;
345 free (local);
346 OSptr->ErrorNo = errno;
347 }
348
349 static void
350 SWIflen (ARMul_State *state, ARMword fh)
351 {
352 struct OSblock* OSptr = (struct OSblock*) state->OSptr;
353 ARMword addr;
354
355 if (fh == 0 || fh > FOPEN_MAX)
356 {
357 OSptr->ErrorNo = EBADF;
358 state->Reg[0] = -1L;
359 return;
360 }
361
362 addr = lseek (fh, 0, SEEK_CUR);
363 if (addr < 0)
364 state->Reg[0] = -1L;
365 else
366 {
367 state->Reg[0] = lseek (fh, 0L, SEEK_END);
368 (void) lseek (fh, addr, SEEK_SET);
369 }
370
371 OSptr->ErrorNo = errno;
372 }
373
374 /***************************************************************************\
375 * The emulator calls this routine when a SWI instruction is encuntered. The *
376 * parameter passed is the SWI number (lower 24 bits of the instruction). *
377 \***************************************************************************/
378
379 unsigned
380 ARMul_OSHandleSWI (ARMul_State *state, ARMword number)
381 {
382 ARMword addr, temp, fildes;
383 char buffer[BUFFERSIZE], *cptr;
384 FILE *fptr;
385 struct OSblock* OSptr = (struct OSblock*)state->OSptr;
386
387 switch (number)
388 {
389 case SWI_Read:
390 SWIread (state, state->Reg[0], state->Reg[1], state->Reg[2]);
391 return TRUE;
392
393 case SWI_Write:
394 SWIwrite (state, state->Reg[0], state->Reg[1], state->Reg[2]);
395 return TRUE;
396
397 case SWI_Open:
398 SWIopen (state, state->Reg[0],state->Reg[1]);
399 return TRUE;
400
401 case SWI_Clock :
402 /* return number of centi-seconds... */
403 state->Reg[0] =
404 #ifdef CLOCKS_PER_SEC
405 (CLOCKS_PER_SEC >= 100)
406 ? (ARMword) (clock() / (CLOCKS_PER_SEC / 100))
407 : (ARMword) ((clock() * 100) / CLOCKS_PER_SEC) ;
408 #else
409 /* presume unix... clock() returns microseconds */
410 (ARMword) (clock() / 10000) ;
411 #endif
412 OSptr->ErrorNo = errno ;
413 return(TRUE) ;
414
415 case SWI_Time :
416 state->Reg[0] = (ARMword)time(NULL) ;
417 OSptr->ErrorNo = errno ;
418 return(TRUE) ;
419
420 case SWI_Close:
421 state->Reg[0] = close (state->Reg[0]);
422 OSptr->ErrorNo = errno;
423 return TRUE;
424
425 case SWI_Flen :
426 SWIflen (state, state->Reg[0]);
427 return(TRUE) ;
428
429 case SWI_Exit:
430 state->Emulate = FALSE ;
431 return TRUE;
432
433 case SWI_Seek:
434 {
435 /* We must return non-zero for failure */
436 state->Reg[0] = -1 >= lseek (state->Reg[0],
437 state->Reg[1],
438 SEEK_SET);
439 OSptr->ErrorNo = errno;
440 return TRUE;
441 }
442
443 case SWI_WriteC :
444 (void)fputc((int)state->Reg[0],stdout) ;
445 OSptr->ErrorNo = errno ;
446 return(TRUE) ;
447
448 case SWI_Write0 :
449 SWIWrite0 (state, state->Reg[0]);
450 return(TRUE) ;
451
452 case SWI_GetErrno :
453 state->Reg[0] = OSptr->ErrorNo ;
454 return(TRUE) ;
455
456 case SWI_Breakpoint :
457 state->EndCondition = RDIError_BreakpointReached ;
458 state->Emulate = FALSE ;
459 return(TRUE) ;
460
461 case SWI_GetEnv :
462 state->Reg[0] = ADDRCMDLINE ;
463 if (state->MemSize)
464 state->Reg[1] = state->MemSize ;
465 else
466 state->Reg[1] = ADDRUSERSTACK ;
467
468 WriteCommandLineTo (state, state->Reg[0]);
469 return(TRUE) ;
470
471 /* Handle Angel SWIs as well as Demon ones */
472 case AngelSWI_ARM:
473 case AngelSWI_Thumb:
474 /* R1 is almost always a parameter block */
475 addr = state->Reg[1];
476 /* R0 is a reason code */
477 switch (state->Reg[0])
478 {
479 /* Unimplemented reason codes */
480 case AngelSWI_Reason_ReadC:
481 case AngelSWI_Reason_IsTTY:
482 case AngelSWI_Reason_TmpNam:
483 case AngelSWI_Reason_Remove:
484 case AngelSWI_Reason_Rename:
485 case AngelSWI_Reason_System:
486 case AngelSWI_Reason_EnterSVC:
487 default:
488 state->Emulate = FALSE;
489 return(FALSE);
490
491 case AngelSWI_Reason_Clock:
492 /* return number of centi-seconds... */
493 state->Reg[0] =
494 #ifdef CLOCKS_PER_SEC
495 (CLOCKS_PER_SEC >= 100)
496 ? (ARMword) (clock() / (CLOCKS_PER_SEC / 100))
497 : (ARMword) ((clock() * 100) / CLOCKS_PER_SEC) ;
498 #else
499 /* presume unix... clock() returns microseconds */
500 (ARMword) (clock() / 10000) ;
501 #endif
502 OSptr->ErrorNo = errno;
503 return (TRUE);
504
505 case AngelSWI_Reason_Time:
506 state->Reg[0] = (ARMword) time (NULL);
507 OSptr->ErrorNo = errno;
508 return (TRUE);
509
510 case AngelSWI_Reason_WriteC:
511 (void) fputc ((int) ARMul_ReadByte (state,addr), stdout);
512 OSptr->ErrorNo = errno;
513 return (TRUE);
514
515 case AngelSWI_Reason_Write0:
516 SWIWrite0 (state, addr);
517 return (TRUE);
518
519 case AngelSWI_Reason_Close:
520 state->Reg[0] = close (ARMul_ReadWord (state, addr));
521 OSptr->ErrorNo = errno;
522 return (TRUE);
523
524 case AngelSWI_Reason_Seek:
525 state->Reg[0] = -1 >= lseek (ARMul_ReadWord(state,addr),
526 ARMul_ReadWord(state,addr+4),
527 SEEK_SET);
528 OSptr->ErrorNo = errno;
529 return (TRUE);
530
531 case AngelSWI_Reason_FLen:
532 SWIflen (state, ARMul_ReadWord (state, addr));
533 return (TRUE);
534
535 case AngelSWI_Reason_GetCmdLine:
536 WriteCommandLineTo (state, ARMul_ReadWord (state, addr));
537 return (TRUE);
538
539 case AngelSWI_Reason_HeapInfo:
540 /* R1 is a pointer to a pointer */
541 addr = ARMul_ReadWord (state, addr);
542
543 /* Pick up the right memory limit */
544 if (state->MemSize)
545 temp = state->MemSize;
546 else
547 temp = ADDRUSERSTACK;
548
549 ARMul_WriteWord (state, addr, 0); /* Heap base */
550 ARMul_WriteWord (state, addr+4, temp); /* Heap limit */
551 ARMul_WriteWord (state, addr+8, temp); /* Stack base */
552 ARMul_WriteWord (state, addr+12, temp); /* Stack limit */
553 return (TRUE);
554
555 case AngelSWI_Reason_ReportException:
556 if (state->Reg[1] == ADP_Stopped_ApplicationExit)
557 state->Reg[0] = 0;
558 else
559 state->Reg[0] = -1;
560 state->Emulate = FALSE ;
561 return (TRUE);
562
563 case ADP_Stopped_ApplicationExit:
564 state->Reg[0] = 0;
565 state->Emulate = FALSE ;
566 return (TRUE);
567
568 case ADP_Stopped_RunTimeError:
569 state->Reg[0] = -1;
570 state->Emulate = FALSE ;
571 return (TRUE);
572
573 case AngelSWI_Reason_Errno:
574 state->Reg[0] = OSptr->ErrorNo;
575 return (TRUE);
576
577 case AngelSWI_Reason_Open:
578 SWIopen(state,
579 ARMul_ReadWord(state, addr),
580 ARMul_ReadWord(state, addr+4));
581 return TRUE;
582
583 case AngelSWI_Reason_Read:
584 SWIread(state,
585 ARMul_ReadWord(state, addr),
586 ARMul_ReadWord(state, addr+4),
587 ARMul_ReadWord(state, addr+8));
588 return TRUE;
589
590 case AngelSWI_Reason_Write:
591 SWIwrite(state,
592 ARMul_ReadWord(state, addr),
593 ARMul_ReadWord(state, addr+4),
594 ARMul_ReadWord(state, addr+8));
595 return TRUE;
596 }
597
598 default :
599 state->Emulate = FALSE ;
600 return(FALSE) ;
601 }
602 }
603
604 #else /* CYGNUS LOCAL: #if 1 */
605
606 unsigned
607 ARMul_OSHandleSWI (ARMul_State *state, ARMword number)
608 {
609 #ifdef NOOS
610 return(FALSE) ;
611 #else
612 #ifdef VALIDATE
613 switch (number) {
614 case 0x11 :
615 state->Emulate = FALSE ;
616 return(TRUE) ;
617 case 0x01 :
618 if (ARM32BITMODE)
619 ARMul_SetCPSR(state, (ARMul_GetCPSR(state) & 0xffffffc0) | 0x13) ;
620 else
621 ARMul_SetCPSR(state, (ARMul_GetCPSR(state) & 0xffffffc0) | 0x3) ;
622 return(TRUE) ;
623 default :
624 return(FALSE) ;
625 }
626 #else
627 ARMword addr, temp ;
628 char buffer[BUFFERSIZE], *cptr ;
629 FILE *fptr ;
630 struct OSblock* OSptr = (struct OSblock*)state->OSptr ;
631
632 switch (number) {
633 case SWI_WriteC :
634 (void)fputc((int)state->Reg[0],stderr) ;
635 OSptr->ErrorNo = errno ;
636 return(TRUE) ;
637
638 case SWI_Write0 :
639 addr = state->Reg[0] ;
640 while ((temp = ARMul_ReadByte(state,addr++)) != 0)
641 fputc((char)temp,stderr) ;
642 OSptr->ErrorNo = errno ;
643 return(TRUE) ;
644
645 case SWI_ReadC :
646 state->Reg[0] = (ARMword)fgetc(stdin) ;
647 OSptr->ErrorNo = errno ;
648 return(TRUE) ;
649
650 case SWI_CLI :
651 addr = state->Reg[0] ;
652 getstring(state,state->Reg[0],buffer) ;
653 state->Reg[0] = (ARMword)system(buffer) ;
654 OSptr->ErrorNo = errno ;
655 return(TRUE) ;
656
657 case SWI_GetEnv :
658 state->Reg[0] = ADDRCMDLINE ;
659 if (state->MemSize)
660 state->Reg[1] = state->MemSize ;
661 else
662 state->Reg[1] = ADDRUSERSTACK ;
663
664 addr = state->Reg[0] ;
665 cptr = state->CommandLine ;
666 if (cptr == NULL)
667 cptr = "\0" ;
668 do {
669 temp = (ARMword)*cptr++ ;
670 ARMul_WriteByte(state,addr++,temp) ;
671 } while (temp != 0) ;
672 return(TRUE) ;
673
674 case SWI_Exit :
675 #ifdef ASIM
676 simkernel1_abort_run() ;
677 #else
678 state->Emulate = FALSE ;
679 #endif
680 return(TRUE) ;
681
682 case SWI_EnterOS :
683 if (ARM32BITMODE)
684 ARMul_SetCPSR(state, (ARMul_GetCPSR(state) & 0xffffffc0) | 0x13) ;
685 else
686 ARMul_SetCPSR(state, (ARMul_GetCPSR(state) & 0xffffffc0) | 0x3) ;
687 return(TRUE) ;
688
689 case SWI_GetErrno :
690 state->Reg[0] = OSptr->ErrorNo ;
691 return(TRUE) ;
692
693 case SWI_Clock :
694 /* return muber of centi-seconds... */
695 state->Reg[0] =
696 #ifdef CLOCKS_PER_SEC
697 (CLOCKS_PER_SEC >= 100)
698 ? (ARMword) (clock() / (CLOCKS_PER_SEC / 100))
699 : (ARMword) ((clock() * 100) / CLOCKS_PER_SEC) ;
700 #else
701 /* presume unix... clock() returns microseconds */
702 (ARMword) (clock() / 10000) ;
703 #endif
704 OSptr->ErrorNo = errno ;
705 return(TRUE) ;
706
707 case SWI_Time :
708 state->Reg[0] = (ARMword)time(NULL) ;
709 OSptr->ErrorNo = errno ;
710 return(TRUE) ;
711
712 case SWI_Remove :
713 getstring(state,state->Reg[0],buffer) ;
714 state->Reg[0] = unlink(buffer) ;
715 OSptr->ErrorNo = errno ;
716 return(TRUE) ;
717
718 case SWI_Rename : {
719 char buffer2[BUFFERSIZE] ;
720
721 getstring(state,state->Reg[0],buffer) ;
722 getstring(state,state->Reg[1],buffer2) ;
723 state->Reg[0] = rename(buffer,buffer2) ;
724 OSptr->ErrorNo = errno ;
725 return(TRUE) ;
726 }
727
728 case SWI_Open : {
729 #if 0
730 /* It seems to me that these are in the wrong order
731 sac@cygnus.com, so I've redone it to use the
732 flags instead, with the functionality which was already
733 there -- ahh, perhaps the TRUNC bit is in a different
734 place on the original host ?*/
735 static char* fmode[] = {"r","rb","r+","r+b",
736 "w","wb","w+","w+b",
737 "a","ab","a+","a+b",
738 "r","r","r","r"} /* last 4 are illegal */ ;
739 #endif
740
741 unsigned type ;
742
743 type = (unsigned)(state->Reg[1] & 3L) ;
744 getstring(state,state->Reg[0],buffer) ;
745 if (strcmp(buffer,":tt")==0 && (type == O_RDONLY )) /* opening tty "r" */
746 fptr = stdin ;
747 else if (strcmp(buffer,":tt")==0 && (type == O_WRONLY)) /* opening tty "w" */
748 fptr = stderr ;
749 else
750 {
751 switch (type)
752 {
753 case O_RDONLY:
754 fptr = fopen(buffer,"r") ;
755 break;
756 case O_WRONLY:
757 fptr = fopen(buffer,"w") ;
758 break;
759 case O_RDWR:
760 fptr = fopen(buffer,"rw") ;
761 break;
762 }
763 }
764
765 state->Reg[0] = 0 ;
766 if (fptr != NULL) {
767 for (temp = 0 ; temp < FOPEN_MAX ; temp++)
768 if (OSptr->FileTable[temp] == NULL) {
769 OSptr->FileTable[temp] = fptr ;
770 OSptr->FileFlags[temp] = type & 1 ; /* preserve the binary bit */
771 state->Reg[0] = (ARMword)(temp + 1) ;
772 break ;
773 }
774 if (state->Reg[0] == 0)
775 OSptr->ErrorNo = EMFILE ; /* too many open files */
776 else
777 OSptr->ErrorNo = errno ;
778 }
779 else
780 OSptr->ErrorNo = errno ;
781 return(TRUE) ;
782 }
783
784 case SWI_Close :
785 temp = state->Reg[0] ;
786 if (temp == 0 || temp > FOPEN_MAX || OSptr->FileTable[temp - 1] == 0) {
787 OSptr->ErrorNo = EBADF ;
788 state->Reg[0] = -1L ;
789 return(TRUE) ;
790 }
791 temp-- ;
792 fptr = OSptr->FileTable[temp] ;
793 if (fptr == stdin || fptr == stderr)
794 state->Reg[0] = 0 ;
795 else
796 state->Reg[0] = fclose(fptr) ;
797 OSptr->FileTable[temp] = NULL ;
798 OSptr->ErrorNo = errno ;
799 return(TRUE) ;
800
801 case SWI_Write : {
802 unsigned size, upto, type ;
803 char ch ;
804
805 temp = state->Reg[0] ;
806 if (temp == 0 || temp > FOPEN_MAX || OSptr->FileTable[temp - 1] == 0) {
807 OSptr->ErrorNo = EBADF ;
808 state->Reg[0] = -1L ;
809 return(TRUE) ;
810 }
811 temp-- ;
812 fptr = OSptr->FileTable[temp] ;
813 type = OSptr->FileFlags[temp] ;
814 addr = state->Reg[1] ;
815 size = (unsigned)state->Reg[2] ;
816
817 if (type & READOP)
818 fseek(fptr,0L,SEEK_CUR) ;
819 OSptr->FileFlags[temp] = (type & BINARY) | WRITEOP ; ;
820 while (size > 0) {
821 if (size >= BUFFERSIZE)
822 upto = BUFFERSIZE ;
823 else
824 upto = size ;
825 for (cptr = buffer ; (cptr - buffer) < upto ; cptr++) {
826 ch = (char)ARMul_ReadByte(state,(ARMword)addr++) ;
827 *cptr = FIXCRLF(type,ch) ;
828 }
829 temp = fwrite(buffer,1,upto,fptr) ;
830 if (temp < upto) {
831 state->Reg[0] = (ARMword)(size - temp) ;
832 OSptr->ErrorNo = errno ;
833 return(TRUE) ;
834 }
835 size -= upto ;
836 }
837 state->Reg[0] = 0 ;
838 OSptr->ErrorNo = errno ;
839 return(TRUE) ;
840 }
841
842 case SWI_Read : {
843 unsigned size, upto, type ;
844 char ch ;
845
846 temp = state->Reg[0] ;
847 if (temp == 0 || temp > FOPEN_MAX || OSptr->FileTable[temp - 1] == 0) {
848 OSptr->ErrorNo = EBADF ;
849 state->Reg[0] = -1L ;
850 return(TRUE) ;
851 }
852 temp-- ;
853 fptr = OSptr->FileTable[temp] ;
854 addr = state->Reg[1] ;
855 size = (unsigned)state->Reg[2] ;
856 type = OSptr->FileFlags[temp] ;
857
858 if (type & WRITEOP)
859 fseek(fptr,0L,SEEK_CUR) ;
860 OSptr->FileFlags[temp] = (type & BINARY) | READOP ; ;
861 while (size > 0) {
862 if (isatty_(fptr)) {
863 upto = (size >= BUFFERSIZE)?BUFFERSIZE:size + 1 ;
864 if (fgets(buffer, upto, fptr) != 0)
865 temp = strlen(buffer) ;
866 else
867 temp = 0 ;
868 upto-- ; /* 1 char used for terminating null */
869 }
870 else {
871 upto = (size>=BUFFERSIZE)?BUFFERSIZE:size ;
872 temp = fread(buffer,1,upto,fptr) ;
873 }
874 for (cptr = buffer ; (cptr - buffer) < temp ; cptr++) {
875 ch = *cptr ;
876 ARMul_WriteByte(state,(ARMword)addr++,FIXCRLF(type,ch)) ;
877 }
878 if (temp < upto) {
879 state->Reg[0] = (ARMword)(size - temp) ;
880 OSptr->ErrorNo = errno ;
881 return(TRUE) ;
882 }
883 size -= upto ;
884 }
885 state->Reg[0] = 0 ;
886 OSptr->ErrorNo = errno ;
887 return(TRUE) ;
888 }
889
890 case SWI_Seek :
891 if (state->Reg[0] == 0 || state->Reg[0] > FOPEN_MAX
892 || OSptr->FileTable[state->Reg[0] - 1] == 0) {
893 OSptr->ErrorNo = EBADF ;
894 state->Reg[0] = -1L ;
895 return(TRUE) ;
896 }
897 fptr = OSptr->FileTable[state->Reg[0] - 1] ;
898 state->Reg[0] = fseek(fptr,(long)state->Reg[1],SEEK_SET) ;
899 OSptr->ErrorNo = errno ;
900 return(TRUE) ;
901
902 case SWI_Flen :
903 if (state->Reg[0] == 0 || state->Reg[0] > FOPEN_MAX
904 || OSptr->FileTable[state->Reg[0] - 1] == 0) {
905 OSptr->ErrorNo = EBADF ;
906 state->Reg[0] = -1L ;
907 return(TRUE) ;
908 }
909 fptr = OSptr->FileTable[state->Reg[0] - 1] ;
910 addr = (ARMword)ftell(fptr) ;
911 if (fseek(fptr,0L,SEEK_END) < 0)
912 state->Reg[0] = -1 ;
913 else {
914 state->Reg[0] = (ARMword)ftell(fptr) ;
915 (void)fseek(fptr,addr,SEEK_SET) ;
916 }
917 OSptr->ErrorNo = errno ;
918 return(TRUE) ;
919
920 case SWI_IsTTY :
921 if (state->Reg[0] == 0 || state->Reg[0] > FOPEN_MAX
922 || OSptr->FileTable[state->Reg[0] - 1] == 0) {
923 OSptr->ErrorNo = EBADF ;
924 state->Reg[0] = -1L ;
925 return(TRUE) ;
926 }
927 fptr = OSptr->FileTable[state->Reg[0] - 1] ;
928 state->Reg[0] = isatty_(fptr) ;
929 OSptr->ErrorNo = errno ;
930 return(TRUE) ;
931
932 case SWI_TmpNam :{
933 ARMword size ;
934
935 addr = state->Reg[0] ;
936 temp = state->Reg[1] & 0xff ;
937 size = state->Reg[2] ;
938 if (OSptr->tempnames[temp] == NULL) {
939 if ((OSptr->tempnames[temp] = malloc(L_tmpnam)) == NULL) {
940 state->Reg[0] = 0 ;
941 return(TRUE) ;
942 }
943 (void)tmpnam(OSptr->tempnames[temp]) ;
944 }
945 cptr = OSptr->tempnames[temp] ;
946 if (strlen(cptr) > state->Reg[2])
947 state->Reg[0] = 0 ;
948 else
949 do {
950 ARMul_WriteByte(state,addr++,*cptr) ;
951 } while (*cptr++ != 0) ;
952 OSptr->ErrorNo = errno ;
953 return(TRUE) ;
954 }
955
956 case SWI_InstallHandler:
957 { ARMword handlerp = ADDRSOFHANDLERS + state->Reg[0] * 8;
958 ARMword oldr1 = ARMul_ReadWord(state, handlerp),
959 oldr2 = ARMul_ReadWord(state, handlerp + 4);
960 ARMul_WriteWord(state, handlerp, state->Reg[1]);
961 ARMul_WriteWord(state, handlerp + 4, state->Reg[2]);
962 state->Reg[1] = oldr1;
963 state->Reg[2] = oldr2;
964 return(TRUE);
965 }
966
967 case SWI_GenerateError:
968 ARMul_Abort(state, ARMSWIV) ;
969 if (state->Emulate)
970 ARMul_SetR15(state, ARMul_ReadWord(state, ADDRSOFTVECTORS + ARMErrorV));
971 return(TRUE);
972
973 /* SWI's 0x9x unwind the state of the CPU after an abort of type x */
974
975 case 0x90: /* Branch through zero */
976 { ARMword oldpsr = ARMul_GetCPSR(state) ;
977 ARMul_SetCPSR(state, (oldpsr & 0xffffffc0) | 0x13) ;
978 ARMul_SetSPSR(state, SVC32MODE, oldpsr) ;
979 state->Reg[14] = 0;
980 goto TidyCommon;
981 }
982
983 case 0x98: /* Error */
984 { ARMword errorp = state->Reg[0],
985 regp = state->Reg[1];
986 unsigned i;
987 ARMword errorpsr = ARMul_ReadWord(state, regp + 16*4);
988 for (i = 0; i < 15; i++)
989 ARMul_SetReg(state,errorpsr,i,ARMul_ReadWord(state, regp + i*4L)) ;
990 state->Reg[14] = ARMul_ReadWord(state, regp + 15*4L);
991 state->Reg[10] = errorp;
992 ARMul_SetSPSR(state,state->Mode,errorpsr) ;
993 OSptr->ErrorP = errorp;
994 goto TidyCommon;
995 }
996
997 case 0x94: /* Data abort */
998 { ARMword addr = state->Reg[14] - 8;
999 ARMword cpsr = ARMul_GetCPSR(state) ;
1000 if (ARM26BITMODE)
1001 addr = addr & 0x3fffffc ;
1002 ARMul_SetCPSR(state,ARMul_GetSPSR(state,cpsr)) ;
1003 UnwindDataAbort(state, addr);
1004 if (addr >= FPESTART && addr < FPEEND) { /* in the FPE */
1005 ARMword sp, spsr ;
1006 unsigned i ;
1007
1008 sp = state->Reg[13] ;
1009 state->Reg[13] += 64 ; /* fix the aborting mode sp */
1010 state->Reg[14] = ARMul_ReadWord(state,sp + 60) ; /* and its lr */
1011 spsr = ARMul_GetSPSR(state,state->Mode) ;
1012 state->Mode = ARMul_SwitchMode(state, state->Mode, spsr);
1013 for (i = 0 ; i < 15 ; i++) {
1014 ARMul_SetReg(state,spsr,i,ARMul_ReadWord(state,sp)) ;
1015 sp += 4 ;
1016 }
1017 ARMul_SetCPSR(state,cpsr) ;
1018 state->Reg[14] = ARMul_ReadWord(state,sp) + 4 ; /* botch it */
1019 ARMul_SetSPSR(state,state->Mode,spsr) ;
1020 }
1021 else
1022 ARMul_SetCPSR(state,cpsr) ;
1023
1024 /* and fall through to correct r14 */
1025 }
1026 case 0x95: /* Address Exception */
1027 state->Reg[14] -= 4;
1028 case 0x91: /* Undefined instruction */
1029 case 0x92: /* SWI */
1030 case 0x93: /* Prefetch abort */
1031 case 0x96: /* IRQ */
1032 case 0x97: /* FIQ */
1033 state->Reg[14] -= 4;
1034 TidyCommon:
1035 if (state->VectorCatch & (1 << (number - 0x90))) {
1036 ARMul_SetR15(state, state->Reg[14] + 8) ; /* the 8 is the pipelining the the RDI will undo */
1037 ARMul_SetCPSR(state,ARMul_GetSPSR(state,ARMul_GetCPSR(state))) ;
1038 if (number == 0x90)
1039 state->EndCondition = 10 ; /* Branch through Zero Error */
1040 else
1041 state->EndCondition = (unsigned)number - 0x8f;
1042 state->Emulate = FALSE ;
1043 }
1044 else {
1045 ARMword sp = state->Reg[13];
1046 ARMul_WriteWord(state, sp - 4, state->Reg[14]);
1047 ARMul_WriteWord(state, sp - 8, state->Reg[12]);
1048 ARMul_WriteWord(state, sp - 12, state->Reg[11]);
1049 ARMul_WriteWord(state, sp - 16, state->Reg[10]);
1050 state->Reg[13] = sp - 16;
1051 state->Reg[11] = ADDRSOFHANDLERS + 8 * (number - 0x90);
1052 }
1053 return(TRUE);
1054
1055 /* SWI's 0x8x pass an abort of type x to the debugger if a handler returns */
1056
1057 case 0x80: case 0x81: case 0x82: case 0x83:
1058 case 0x84: case 0x85: case 0x86: case 0x87: case 0x88:
1059 { ARMword sp = state->Reg[13];
1060 state->Reg[10] = ARMul_ReadWord(state, sp);
1061 state->Reg[11] = ARMul_ReadWord(state, sp + 4);
1062 state->Reg[12] = ARMul_ReadWord(state, sp + 8);
1063 state->Reg[14] = ARMul_ReadWord(state, sp + 12);
1064 state->Reg[13] = sp + 16;
1065 ARMul_SetR15(state, state->Reg[14] + 8) ; /* the 8 is the pipelining the the RDI will undo */
1066 ARMul_SetCPSR(state,ARMul_GetSPSR(state,ARMul_GetCPSR(state))) ;
1067 if (number == 0x80)
1068 state->EndCondition = 10 ; /* Branch through Zero Error */
1069 else
1070 state->EndCondition = (unsigned)number - 0x7f;
1071 state->Emulate = FALSE ;
1072 return(TRUE);
1073 }
1074
1075 default :
1076 state->Emulate = FALSE ;
1077 return(FALSE) ;
1078 }
1079 #endif
1080 #endif
1081 }
1082 #endif /* CYGNUS LOCAL: #if 1 */
1083
1084 #ifndef NOOS
1085 #ifndef ASIM
1086
1087 /***************************************************************************\
1088 * The emulator calls this routine when an Exception occurs. The second *
1089 * parameter is the address of the relevant exception vector. Returning *
1090 * FALSE from this routine causes the trap to be taken, TRUE causes it to *
1091 * be ignored (so set state->Emulate to FALSE!). *
1092 \***************************************************************************/
1093
1094 unsigned
1095 ARMul_OSException (ARMul_State *state, ARMword vector, ARMword pc)
1096 { /* don't use this here */
1097 return(FALSE) ;
1098 }
1099
1100 #endif
1101
1102 /***************************************************************************\
1103 * Unwind a data abort *
1104 \***************************************************************************/
1105
1106 static void
1107 UnwindDataAbort (ARMul_State *state, ARMword addr)
1108 {
1109 ARMword instr = ARMul_ReadWord(state, addr);
1110 ARMword rn = BITS(16, 19);
1111 ARMword itype = BITS(24, 27);
1112 ARMword offset;
1113 if (rn == 15) return;
1114 if (itype == 8 || itype == 9) {
1115 /* LDM or STM */
1116 unsigned long regs = BITS(0, 15);
1117 offset = 0;
1118 if (!BIT(21)) return; /* no wb */
1119 for (; regs != 0; offset++)
1120 regs ^= (regs & -regs);
1121 if (offset == 0) offset = 16;
1122 } else if (itype == 12 || /* post-indexed CPDT */
1123 (itype == 13 && BIT(21))) { /* pre_indexed CPDT with WB */
1124 offset = BITS(0, 7);
1125 } else
1126 return;
1127
1128 if (BIT(23))
1129 state->Reg[rn] -= offset * 4;
1130 else
1131 state->Reg[rn] += offset * 4;
1132 }
1133
1134 /***************************************************************************\
1135 * Copy a string from the debuggee's memory to the host's *
1136 \***************************************************************************/
1137
1138 static void
1139 getstring (ARMul_State *state, ARMword from, char *to)
1140 {
1141 do
1142 {
1143 *to = (char) ARMul_ReadByte (state, from++);
1144 } while (*to++ != '\0');
1145 }
1146
1147 #endif /* NOOS */
GDB Binutils - Deliverables
This page took 0.058064 seconds and 4 git commands to generate.