1 /* armos.c -- ARMulator OS interface: ARM6 Instruction Emulator.
2 Copyright (C) 1994 Advanced RISC Machines Ltd.
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.
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.
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. */
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. */
46 #define unlink(s) remove(s)
50 #include <unistd.h> /* For SEEK_SET etc */
54 extern int _fisatty(FILE *);
55 #define isatty_(f) _fisatty(f)
59 #define isatty_(f) isatty((f)->_file)
63 #define isatty_(f) (~ioctl ((f)->_file, FIOINTERACTIVE, NULL))
65 #define isatty_(f) isatty (fileno (f))
80 /* For RDIError_BreakpointReached. */
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) ;
90 #define BUFFERSIZE 4096
94 #define UNIQUETEMPS 256
97 static void UnwindDataAbort(ARMul_State *state, ARMword addr);
98 static void getstring(ARMul_State *state, ARMword from, char *to) ;
101 /***************************************************************************\
102 * OS private Information *
103 \***************************************************************************/
109 FILE *FileTable[FOPEN_MAX] ;
110 char FileFlags[FOPEN_MAX] ;
111 char *tempnames[UNIQUETEMPS] ;
120 #define FIXCRLF(t,c) ((t & BINARY) ? \
122 ((c == '\n' || c == '\r' ) ? (c ^ 7) : c) \
125 #define FIXCRLF(t,c) c
128 static ARMword softvectorcode[] =
129 { /* basic: swi tidyexception + event; mov pc, lr;
130 ldmia r11,{r11,pc}; swi generateexception + event
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 */
144 /***************************************************************************\
145 * Time for the Operating System to initialise itself. *
146 \***************************************************************************/
149 ARMul_OSInit (ARMul_State *state)
153 ARMword instr, i , j ;
154 struct OSblock* OSptr = (struct OSblock*)state->OSptr;
156 if (state->OSptr == NULL) {
157 state->OSptr = (unsigned char *)malloc(sizeof(struct OSblock));
158 if (state->OSptr == NULL) {
163 OSptr = (struct OSblock*)state->OSptr;
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);
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");
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)
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) ;
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") ;
205 #endif /* VALIDATE */
212 ARMul_OSExit (ARMul_State *state)
214 free((char *)state->OSptr);
218 /***************************************************************************\
219 * Return the last Operating System Error. *
220 \***************************************************************************/
223 ARMul_OSLastErrorP (ARMul_State *state)
225 return ((struct OSblock *)state->OSptr)->ErrorP;
228 #if 1 /* CYGNUS LOCAL */
229 /* This is the cygnus way of doing it, which makes it simple to do our tests */
231 static int translate_open_mode[] =
234 O_RDONLY+O_BINARY, /* "rb" */
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" */
248 SWIWrite0 (ARMul_State *state, ARMword addr)
251 struct OSblock* OSptr = (struct OSblock*) state->OSptr;
253 while ((temp = ARMul_ReadByte (state, addr++)) != 0)
254 (void) fputc ((char) temp, stdout);
256 OSptr->ErrorNo = errno;
260 WriteCommandLineTo (ARMul_State *state, ARMword addr)
263 char *cptr = state->CommandLine;
267 temp = (ARMword) *cptr++;
268 ARMul_WriteByte (state, addr++, temp);
273 SWIopen (ARMul_State *state, ARMword name, ARMword SWIflags)
275 struct OSblock* OSptr = (struct OSblock*)state->OSptr;
281 dummy[i] = ARMul_ReadByte (state, name + i);
285 /* Now we need to decode the Demon open mode */
286 flags = translate_open_mode[SWIflags];
288 /* Filename ":tt" is special: it denotes stdin/out */
289 if (strcmp (dummy, ":tt") == 0)
291 if (flags == O_RDONLY) /* opening tty "r" */
292 state->Reg[0] = 0; /* stdin */
294 state->Reg[0] = 1; /* stdout */
298 state->Reg[0] = (int) open (dummy, flags);
299 OSptr->ErrorNo = errno;
304 SWIread (ARMul_State *state, ARMword f, ARMword ptr, ARMword len)
306 struct OSblock* OSptr = (struct OSblock*) state->OSptr;
309 char *local = malloc (len);
311 res = read (f, local, len);
313 for (i = 0; i < res; i++)
314 ARMul_WriteByte (state, ptr + i, local[i]);
316 state->Reg[0] = res == -1 ? -1 : len - res;
317 OSptr->ErrorNo = errno;
321 SWIwrite (ARMul_State *state, ARMword f, ARMword ptr, ARMword len)
323 struct OSblock* OSptr = (struct OSblock*) state->OSptr;
326 char *local = malloc (len);
328 for (i = 0; i < len; i++)
330 local[i] = ARMul_ReadByte (state, ptr + i);
332 res = write (f, local, len);
333 state->Reg[0] = res == -1 ? -1 : len - res;
335 OSptr->ErrorNo = errno;
339 SWIflen (ARMul_State *state, ARMword fh)
341 struct OSblock* OSptr = (struct OSblock*) state->OSptr;
344 if (fh == 0 || fh > FOPEN_MAX)
346 OSptr->ErrorNo = EBADF;
351 addr = lseek (fh, 0, SEEK_CUR);
356 state->Reg[0] = lseek (fh, 0L, SEEK_END);
357 (void) lseek (fh, addr, SEEK_SET);
360 OSptr->ErrorNo = errno;
363 /***************************************************************************\
364 * The emulator calls this routine when a SWI instruction is encuntered. The *
365 * parameter passed is the SWI number (lower 24 bits of the instruction). *
366 \***************************************************************************/
369 ARMul_OSHandleSWI (ARMul_State *state, ARMword number)
371 ARMword addr, temp, fildes;
372 char buffer[BUFFERSIZE], *cptr;
374 struct OSblock* OSptr = (struct OSblock*)state->OSptr;
379 SWIread (state, state->Reg[0], state->Reg[1], state->Reg[2]);
383 SWIwrite (state, state->Reg[0], state->Reg[1], state->Reg[2]);
387 SWIopen (state, state->Reg[0],state->Reg[1]);
391 /* return number of centi-seconds... */
393 #ifdef CLOCKS_PER_SEC
394 (CLOCKS_PER_SEC >= 100)
395 ? (ARMword) (clock() / (CLOCKS_PER_SEC / 100))
396 : (ARMword) ((clock() * 100) / CLOCKS_PER_SEC) ;
398 /* presume unix... clock() returns microseconds */
399 (ARMword) (clock() / 10000) ;
401 OSptr->ErrorNo = errno ;
405 state->Reg[0] = (ARMword)time(NULL) ;
406 OSptr->ErrorNo = errno ;
410 state->Reg[0] = close (state->Reg[0]);
411 OSptr->ErrorNo = errno;
415 SWIflen (state, state->Reg[0]);
419 state->Emulate = FALSE ;
424 /* We must return non-zero for failure */
425 state->Reg[0] = -1 >= lseek (state->Reg[0],
428 OSptr->ErrorNo = errno;
433 (void)fputc((int)state->Reg[0],stdout) ;
434 OSptr->ErrorNo = errno ;
438 SWIWrite0 (state, state->Reg[0]);
442 state->Reg[0] = OSptr->ErrorNo ;
445 case SWI_Breakpoint :
446 state->EndCondition = RDIError_BreakpointReached ;
447 state->Emulate = FALSE ;
451 state->Reg[0] = ADDRCMDLINE ;
453 state->Reg[1] = state->MemSize ;
455 state->Reg[1] = ADDRUSERSTACK ;
457 WriteCommandLineTo (state, state->Reg[0]);
460 /* Handle Angel SWIs as well as Demon ones */
463 /* R1 is almost always a parameter block */
464 addr = state->Reg[1];
465 /* R0 is a reason code */
466 switch (state->Reg[0])
468 /* Unimplemented reason codes */
469 case AngelSWI_Reason_ReadC:
470 case AngelSWI_Reason_IsTTY:
471 case AngelSWI_Reason_TmpNam:
472 case AngelSWI_Reason_Remove:
473 case AngelSWI_Reason_Rename:
474 case AngelSWI_Reason_System:
475 case AngelSWI_Reason_EnterSVC:
477 state->Emulate = FALSE;
480 case AngelSWI_Reason_Clock:
481 /* return number of centi-seconds... */
483 #ifdef CLOCKS_PER_SEC
484 (CLOCKS_PER_SEC >= 100)
485 ? (ARMword) (clock() / (CLOCKS_PER_SEC / 100))
486 : (ARMword) ((clock() * 100) / CLOCKS_PER_SEC) ;
488 /* presume unix... clock() returns microseconds */
489 (ARMword) (clock() / 10000) ;
491 OSptr->ErrorNo = errno;
494 case AngelSWI_Reason_Time:
495 state->Reg[0] = (ARMword) time (NULL);
496 OSptr->ErrorNo = errno;
499 case AngelSWI_Reason_WriteC:
500 (void) fputc ((int) ARMul_ReadByte (state,addr), stdout);
501 OSptr->ErrorNo = errno;
504 case AngelSWI_Reason_Write0:
505 SWIWrite0 (state, addr);
508 case AngelSWI_Reason_Close:
509 state->Reg[0] = close (ARMul_ReadWord (state, addr));
510 OSptr->ErrorNo = errno;
513 case AngelSWI_Reason_Seek:
514 state->Reg[0] = -1 >= lseek (ARMul_ReadWord(state,addr),
515 ARMul_ReadWord(state,addr+4),
517 OSptr->ErrorNo = errno;
520 case AngelSWI_Reason_FLen:
521 SWIflen (state, ARMul_ReadWord (state, addr));
524 case AngelSWI_Reason_GetCmdLine:
525 WriteCommandLineTo (state, ARMul_ReadWord (state, addr));
528 case AngelSWI_Reason_HeapInfo:
529 /* R1 is a pointer to a pointer */
530 addr = ARMul_ReadWord (state, addr);
532 /* Pick up the right memory limit */
534 temp = state->MemSize;
536 temp = ADDRUSERSTACK;
538 ARMul_WriteWord (state, addr, 0); /* Heap base */
539 ARMul_WriteWord (state, addr+4, temp); /* Heap limit */
540 ARMul_WriteWord (state, addr+8, temp); /* Stack base */
541 ARMul_WriteWord (state, addr+12, temp); /* Stack limit */
544 case AngelSWI_Reason_ReportException:
545 if (state->Reg[1] == ADP_Stopped_ApplicationExit)
549 state->Emulate = FALSE ;
552 case ADP_Stopped_ApplicationExit:
554 state->Emulate = FALSE ;
557 case ADP_Stopped_RunTimeError:
559 state->Emulate = FALSE ;
562 case AngelSWI_Reason_Errno:
563 state->Reg[0] = OSptr->ErrorNo;
566 case AngelSWI_Reason_Open:
568 ARMul_ReadWord(state, addr),
569 ARMul_ReadWord(state, addr+4));
572 case AngelSWI_Reason_Read:
574 ARMul_ReadWord(state, addr),
575 ARMul_ReadWord(state, addr+4),
576 ARMul_ReadWord(state, addr+8));
579 case AngelSWI_Reason_Write:
581 ARMul_ReadWord(state, addr),
582 ARMul_ReadWord(state, addr+4),
583 ARMul_ReadWord(state, addr+8));
588 state->Emulate = FALSE ;
593 #else /* CYGNUS LOCAL: #if 1 */
596 ARMul_OSHandleSWI (ARMul_State *state, ARMword number)
604 state->Emulate = FALSE ;
608 ARMul_SetCPSR(state, (ARMul_GetCPSR(state) & 0xffffffc0) | 0x13) ;
610 ARMul_SetCPSR(state, (ARMul_GetCPSR(state) & 0xffffffc0) | 0x3) ;
617 char buffer[BUFFERSIZE], *cptr ;
619 struct OSblock* OSptr = (struct OSblock*)state->OSptr ;
623 (void)fputc((int)state->Reg[0],stderr) ;
624 OSptr->ErrorNo = errno ;
628 addr = state->Reg[0] ;
629 while ((temp = ARMul_ReadByte(state,addr++)) != 0)
630 fputc((char)temp,stderr) ;
631 OSptr->ErrorNo = errno ;
635 state->Reg[0] = (ARMword)fgetc(stdin) ;
636 OSptr->ErrorNo = errno ;
640 addr = state->Reg[0] ;
641 getstring(state,state->Reg[0],buffer) ;
642 state->Reg[0] = (ARMword)system(buffer) ;
643 OSptr->ErrorNo = errno ;
647 state->Reg[0] = ADDRCMDLINE ;
649 state->Reg[1] = state->MemSize ;
651 state->Reg[1] = ADDRUSERSTACK ;
653 addr = state->Reg[0] ;
654 cptr = state->CommandLine ;
658 temp = (ARMword)*cptr++ ;
659 ARMul_WriteByte(state,addr++,temp) ;
660 } while (temp != 0) ;
665 simkernel1_abort_run() ;
667 state->Emulate = FALSE ;
673 ARMul_SetCPSR(state, (ARMul_GetCPSR(state) & 0xffffffc0) | 0x13) ;
675 ARMul_SetCPSR(state, (ARMul_GetCPSR(state) & 0xffffffc0) | 0x3) ;
679 state->Reg[0] = OSptr->ErrorNo ;
683 /* return muber of centi-seconds... */
685 #ifdef CLOCKS_PER_SEC
686 (CLOCKS_PER_SEC >= 100)
687 ? (ARMword) (clock() / (CLOCKS_PER_SEC / 100))
688 : (ARMword) ((clock() * 100) / CLOCKS_PER_SEC) ;
690 /* presume unix... clock() returns microseconds */
691 (ARMword) (clock() / 10000) ;
693 OSptr->ErrorNo = errno ;
697 state->Reg[0] = (ARMword)time(NULL) ;
698 OSptr->ErrorNo = errno ;
702 getstring(state,state->Reg[0],buffer) ;
703 state->Reg[0] = unlink(buffer) ;
704 OSptr->ErrorNo = errno ;
708 char buffer2[BUFFERSIZE] ;
710 getstring(state,state->Reg[0],buffer) ;
711 getstring(state,state->Reg[1],buffer2) ;
712 state->Reg[0] = rename(buffer,buffer2) ;
713 OSptr->ErrorNo = errno ;
719 /* It seems to me that these are in the wrong order
720 sac@cygnus.com, so I've redone it to use the
721 flags instead, with the functionality which was already
722 there -- ahh, perhaps the TRUNC bit is in a different
723 place on the original host ?*/
724 static char* fmode[] = {"r","rb","r+","r+b",
727 "r","r","r","r"} /* last 4 are illegal */ ;
732 type = (unsigned)(state->Reg[1] & 3L) ;
733 getstring(state,state->Reg[0],buffer) ;
734 if (strcmp(buffer,":tt")==0 && (type == O_RDONLY )) /* opening tty "r" */
736 else if (strcmp(buffer,":tt")==0 && (type == O_WRONLY)) /* opening tty "w" */
743 fptr = fopen(buffer,"r") ;
746 fptr = fopen(buffer,"w") ;
749 fptr = fopen(buffer,"rw") ;
756 for (temp = 0 ; temp < FOPEN_MAX ; temp++)
757 if (OSptr->FileTable[temp] == NULL) {
758 OSptr->FileTable[temp] = fptr ;
759 OSptr->FileFlags[temp] = type & 1 ; /* preserve the binary bit */
760 state->Reg[0] = (ARMword)(temp + 1) ;
763 if (state->Reg[0] == 0)
764 OSptr->ErrorNo = EMFILE ; /* too many open files */
766 OSptr->ErrorNo = errno ;
769 OSptr->ErrorNo = errno ;
774 temp = state->Reg[0] ;
775 if (temp == 0 || temp > FOPEN_MAX || OSptr->FileTable[temp - 1] == 0) {
776 OSptr->ErrorNo = EBADF ;
777 state->Reg[0] = -1L ;
781 fptr = OSptr->FileTable[temp] ;
782 if (fptr == stdin || fptr == stderr)
785 state->Reg[0] = fclose(fptr) ;
786 OSptr->FileTable[temp] = NULL ;
787 OSptr->ErrorNo = errno ;
791 unsigned size, upto, type ;
794 temp = state->Reg[0] ;
795 if (temp == 0 || temp > FOPEN_MAX || OSptr->FileTable[temp - 1] == 0) {
796 OSptr->ErrorNo = EBADF ;
797 state->Reg[0] = -1L ;
801 fptr = OSptr->FileTable[temp] ;
802 type = OSptr->FileFlags[temp] ;
803 addr = state->Reg[1] ;
804 size = (unsigned)state->Reg[2] ;
807 fseek(fptr,0L,SEEK_CUR) ;
808 OSptr->FileFlags[temp] = (type & BINARY) | WRITEOP ; ;
810 if (size >= BUFFERSIZE)
814 for (cptr = buffer ; (cptr - buffer) < upto ; cptr++) {
815 ch = (char)ARMul_ReadByte(state,(ARMword)addr++) ;
816 *cptr = FIXCRLF(type,ch) ;
818 temp = fwrite(buffer,1,upto,fptr) ;
820 state->Reg[0] = (ARMword)(size - temp) ;
821 OSptr->ErrorNo = errno ;
827 OSptr->ErrorNo = errno ;
832 unsigned size, upto, type ;
835 temp = state->Reg[0] ;
836 if (temp == 0 || temp > FOPEN_MAX || OSptr->FileTable[temp - 1] == 0) {
837 OSptr->ErrorNo = EBADF ;
838 state->Reg[0] = -1L ;
842 fptr = OSptr->FileTable[temp] ;
843 addr = state->Reg[1] ;
844 size = (unsigned)state->Reg[2] ;
845 type = OSptr->FileFlags[temp] ;
848 fseek(fptr,0L,SEEK_CUR) ;
849 OSptr->FileFlags[temp] = (type & BINARY) | READOP ; ;
852 upto = (size >= BUFFERSIZE)?BUFFERSIZE:size + 1 ;
853 if (fgets(buffer, upto, fptr) != 0)
854 temp = strlen(buffer) ;
857 upto-- ; /* 1 char used for terminating null */
860 upto = (size>=BUFFERSIZE)?BUFFERSIZE:size ;
861 temp = fread(buffer,1,upto,fptr) ;
863 for (cptr = buffer ; (cptr - buffer) < temp ; cptr++) {
865 ARMul_WriteByte(state,(ARMword)addr++,FIXCRLF(type,ch)) ;
868 state->Reg[0] = (ARMword)(size - temp) ;
869 OSptr->ErrorNo = errno ;
875 OSptr->ErrorNo = errno ;
880 if (state->Reg[0] == 0 || state->Reg[0] > FOPEN_MAX
881 || OSptr->FileTable[state->Reg[0] - 1] == 0) {
882 OSptr->ErrorNo = EBADF ;
883 state->Reg[0] = -1L ;
886 fptr = OSptr->FileTable[state->Reg[0] - 1] ;
887 state->Reg[0] = fseek(fptr,(long)state->Reg[1],SEEK_SET) ;
888 OSptr->ErrorNo = errno ;
892 if (state->Reg[0] == 0 || state->Reg[0] > FOPEN_MAX
893 || OSptr->FileTable[state->Reg[0] - 1] == 0) {
894 OSptr->ErrorNo = EBADF ;
895 state->Reg[0] = -1L ;
898 fptr = OSptr->FileTable[state->Reg[0] - 1] ;
899 addr = (ARMword)ftell(fptr) ;
900 if (fseek(fptr,0L,SEEK_END) < 0)
903 state->Reg[0] = (ARMword)ftell(fptr) ;
904 (void)fseek(fptr,addr,SEEK_SET) ;
906 OSptr->ErrorNo = errno ;
910 if (state->Reg[0] == 0 || state->Reg[0] > FOPEN_MAX
911 || OSptr->FileTable[state->Reg[0] - 1] == 0) {
912 OSptr->ErrorNo = EBADF ;
913 state->Reg[0] = -1L ;
916 fptr = OSptr->FileTable[state->Reg[0] - 1] ;
917 state->Reg[0] = isatty_(fptr) ;
918 OSptr->ErrorNo = errno ;
924 addr = state->Reg[0] ;
925 temp = state->Reg[1] & 0xff ;
926 size = state->Reg[2] ;
927 if (OSptr->tempnames[temp] == NULL) {
928 if ((OSptr->tempnames[temp] = malloc(L_tmpnam)) == NULL) {
932 (void)tmpnam(OSptr->tempnames[temp]) ;
934 cptr = OSptr->tempnames[temp] ;
935 if (strlen(cptr) > state->Reg[2])
939 ARMul_WriteByte(state,addr++,*cptr) ;
940 } while (*cptr++ != 0) ;
941 OSptr->ErrorNo = errno ;
945 case SWI_InstallHandler:
946 { ARMword handlerp = ADDRSOFHANDLERS + state->Reg[0] * 8;
947 ARMword oldr1 = ARMul_ReadWord(state, handlerp),
948 oldr2 = ARMul_ReadWord(state, handlerp + 4);
949 ARMul_WriteWord(state, handlerp, state->Reg[1]);
950 ARMul_WriteWord(state, handlerp + 4, state->Reg[2]);
951 state->Reg[1] = oldr1;
952 state->Reg[2] = oldr2;
956 case SWI_GenerateError:
957 ARMul_Abort(state, ARMSWIV) ;
959 ARMul_SetR15(state, ARMul_ReadWord(state, ADDRSOFTVECTORS + ARMErrorV));
962 /* SWI's 0x9x unwind the state of the CPU after an abort of type x */
964 case 0x90: /* Branch through zero */
965 { ARMword oldpsr = ARMul_GetCPSR(state) ;
966 ARMul_SetCPSR(state, (oldpsr & 0xffffffc0) | 0x13) ;
967 ARMul_SetSPSR(state, SVC32MODE, oldpsr) ;
972 case 0x98: /* Error */
973 { ARMword errorp = state->Reg[0],
974 regp = state->Reg[1];
976 ARMword errorpsr = ARMul_ReadWord(state, regp + 16*4);
977 for (i = 0; i < 15; i++)
978 ARMul_SetReg(state,errorpsr,i,ARMul_ReadWord(state, regp + i*4L)) ;
979 state->Reg[14] = ARMul_ReadWord(state, regp + 15*4L);
980 state->Reg[10] = errorp;
981 ARMul_SetSPSR(state,state->Mode,errorpsr) ;
982 OSptr->ErrorP = errorp;
986 case 0x94: /* Data abort */
987 { ARMword addr = state->Reg[14] - 8;
988 ARMword cpsr = ARMul_GetCPSR(state) ;
990 addr = addr & 0x3fffffc ;
991 ARMul_SetCPSR(state,ARMul_GetSPSR(state,cpsr)) ;
992 UnwindDataAbort(state, addr);
993 if (addr >= FPESTART && addr < FPEEND) { /* in the FPE */
997 sp = state->Reg[13] ;
998 state->Reg[13] += 64 ; /* fix the aborting mode sp */
999 state->Reg[14] = ARMul_ReadWord(state,sp + 60) ; /* and its lr */
1000 spsr = ARMul_GetSPSR(state,state->Mode) ;
1001 state->Mode = ARMul_SwitchMode(state, state->Mode, spsr);
1002 for (i = 0 ; i < 15 ; i++) {
1003 ARMul_SetReg(state,spsr,i,ARMul_ReadWord(state,sp)) ;
1006 ARMul_SetCPSR(state,cpsr) ;
1007 state->Reg[14] = ARMul_ReadWord(state,sp) + 4 ; /* botch it */
1008 ARMul_SetSPSR(state,state->Mode,spsr) ;
1011 ARMul_SetCPSR(state,cpsr) ;
1013 /* and fall through to correct r14 */
1015 case 0x95: /* Address Exception */
1016 state->Reg[14] -= 4;
1017 case 0x91: /* Undefined instruction */
1018 case 0x92: /* SWI */
1019 case 0x93: /* Prefetch abort */
1020 case 0x96: /* IRQ */
1021 case 0x97: /* FIQ */
1022 state->Reg[14] -= 4;
1024 if (state->VectorCatch & (1 << (number - 0x90))) {
1025 ARMul_SetR15(state, state->Reg[14] + 8) ; /* the 8 is the pipelining the the RDI will undo */
1026 ARMul_SetCPSR(state,ARMul_GetSPSR(state,ARMul_GetCPSR(state))) ;
1028 state->EndCondition = 10 ; /* Branch through Zero Error */
1030 state->EndCondition = (unsigned)number - 0x8f;
1031 state->Emulate = FALSE ;
1034 ARMword sp = state->Reg[13];
1035 ARMul_WriteWord(state, sp - 4, state->Reg[14]);
1036 ARMul_WriteWord(state, sp - 8, state->Reg[12]);
1037 ARMul_WriteWord(state, sp - 12, state->Reg[11]);
1038 ARMul_WriteWord(state, sp - 16, state->Reg[10]);
1039 state->Reg[13] = sp - 16;
1040 state->Reg[11] = ADDRSOFHANDLERS + 8 * (number - 0x90);
1044 /* SWI's 0x8x pass an abort of type x to the debugger if a handler returns */
1046 case 0x80: case 0x81: case 0x82: case 0x83:
1047 case 0x84: case 0x85: case 0x86: case 0x87: case 0x88:
1048 { ARMword sp = state->Reg[13];
1049 state->Reg[10] = ARMul_ReadWord(state, sp);
1050 state->Reg[11] = ARMul_ReadWord(state, sp + 4);
1051 state->Reg[12] = ARMul_ReadWord(state, sp + 8);
1052 state->Reg[14] = ARMul_ReadWord(state, sp + 12);
1053 state->Reg[13] = sp + 16;
1054 ARMul_SetR15(state, state->Reg[14] + 8) ; /* the 8 is the pipelining the the RDI will undo */
1055 ARMul_SetCPSR(state,ARMul_GetSPSR(state,ARMul_GetCPSR(state))) ;
1057 state->EndCondition = 10 ; /* Branch through Zero Error */
1059 state->EndCondition = (unsigned)number - 0x7f;
1060 state->Emulate = FALSE ;
1065 state->Emulate = FALSE ;
1071 #endif /* CYGNUS LOCAL: #if 1 */
1076 /***************************************************************************\
1077 * The emulator calls this routine when an Exception occurs. The second *
1078 * parameter is the address of the relevant exception vector. Returning *
1079 * FALSE from this routine causes the trap to be taken, TRUE causes it to *
1080 * be ignored (so set state->Emulate to FALSE!). *
1081 \***************************************************************************/
1084 ARMul_OSException (ARMul_State *state, ARMword vector, ARMword pc)
1085 { /* don't use this here */
1091 /***************************************************************************\
1092 * Unwind a data abort *
1093 \***************************************************************************/
1096 UnwindDataAbort (ARMul_State *state, ARMword addr)
1098 ARMword instr = ARMul_ReadWord(state, addr);
1099 ARMword rn = BITS(16, 19);
1100 ARMword itype = BITS(24, 27);
1102 if (rn == 15) return;
1103 if (itype == 8 || itype == 9) {
1105 unsigned long regs = BITS(0, 15);
1107 if (!BIT(21)) return; /* no wb */
1108 for (; regs != 0; offset++)
1109 regs ^= (regs & -regs);
1110 if (offset == 0) offset = 16;
1111 } else if (itype == 12 || /* post-indexed CPDT */
1112 (itype == 13 && BIT(21))) { /* pre_indexed CPDT with WB */
1113 offset = BITS(0, 7);
1118 state->Reg[rn] -= offset * 4;
1120 state->Reg[rn] += offset * 4;
1123 /***************************************************************************\
1124 * Copy a string from the debuggee's memory to the host's *
1125 \***************************************************************************/
1128 getstring (ARMul_State *state, ARMword from, char *to)
1132 *to = (char) ARMul_ReadByte (state, from++);
1133 } while (*to++ != '\0');