/* armos.c -- ARMulator OS interface: ARM6 Instruction Emulator. Copyright (C) 1994 Advanced RISC Machines Ltd. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* This file contains a model of Demon, ARM Ltd's Debug Monitor, including all the SWI's required to support the C library. The code in it is not really for the faint-hearted (especially the abort handling code), but it is a complete example. Defining NOOS will disable all the fun, and definign VAILDATE will define SWI 1 to enter SVC mode, and SWI 0x11 to halt the emulator. */ #include "config.h" #include "ansidecl.h" #include #include #include #include #ifndef O_RDONLY #define O_RDONLY 0 #endif #ifndef O_WRONLY #define O_WRONLY 1 #endif #ifndef O_RDWR #define O_RDWR 2 #endif #ifndef O_BINARY #define O_BINARY 0 #endif #ifdef __STDC__ #define unlink(s) remove(s) #endif #ifdef HAVE_UNISTD_H #include /* For SEEK_SET etc */ #endif #ifdef __riscos extern int _fisatty (FILE *); #define isatty_(f) _fisatty(f) #else #ifdef __ZTC__ #include #define isatty_(f) isatty((f)->_file) #else #ifdef macintosh #include #define isatty_(f) (~ioctl ((f)->_file, FIOINTERACTIVE, NULL)) #else #define isatty_(f) isatty (fileno (f)) #endif #endif #endif #include "armdefs.h" #include "armos.h" #ifndef NOOS #ifndef VALIDATE /* #ifndef ASIM */ #include "armfpe.h" /* #endif */ #endif #endif /* For RDIError_BreakpointReached. */ #include "dbg_rdi.h" extern unsigned ARMul_OSInit (ARMul_State * state); extern void ARMul_OSExit (ARMul_State * state); extern unsigned ARMul_OSHandleSWI (ARMul_State * state, ARMword number); extern unsigned ARMul_OSException (ARMul_State * state, ARMword vector, ARMword pc); extern ARMword ARMul_OSLastErrorP (ARMul_State * state); extern ARMword ARMul_Debug (ARMul_State * state, ARMword pc, ARMword instr); #define BUFFERSIZE 4096 #ifndef FOPEN_MAX #define FOPEN_MAX 64 #endif #define UNIQUETEMPS 256 /***************************************************************************\ * OS private Information * \***************************************************************************/ struct OSblock { ARMword Time0; ARMword ErrorP; ARMword ErrorNo; FILE *FileTable[FOPEN_MAX]; char FileFlags[FOPEN_MAX]; char *tempnames[UNIQUETEMPS]; }; #define NOOP 0 #define BINARY 1 #define READOP 2 #define WRITEOP 4 #ifdef macintosh #define FIXCRLF(t,c) ((t & BINARY) ? \ c : \ ((c == '\n' || c == '\r' ) ? (c ^ 7) : c) \ ) #else #define FIXCRLF(t,c) c #endif static ARMword softvectorcode[] = { /* basic: swi tidyexception + event; mov pc, lr; ldmia r11,{r11,pc}; swi generateexception + event. */ 0xef000090, 0xe1a0e00f, 0xe89b8800, 0xef000080, /*Reset */ 0xef000091, 0xe1a0e00f, 0xe89b8800, 0xef000081, /*Undef */ 0xef000092, 0xe1a0e00f, 0xe89b8800, 0xef000082, /*SWI */ 0xef000093, 0xe1a0e00f, 0xe89b8800, 0xef000083, /*Prefetch abort */ 0xef000094, 0xe1a0e00f, 0xe89b8800, 0xef000084, /*Data abort */ 0xef000095, 0xe1a0e00f, 0xe89b8800, 0xef000085, /*Address exception */ 0xef000096, 0xe1a0e00f, 0xe89b8800, 0xef000086, /*IRQ*/ 0xef000097, 0xe1a0e00f, 0xe89b8800, 0xef000087, /*FIQ*/ 0xef000098, 0xe1a0e00f, 0xe89b8800, 0xef000088, /*Error */ 0xe1a0f00e /* default handler */ }; /***************************************************************************\ * Time for the Operating System to initialise itself. * \***************************************************************************/ unsigned ARMul_OSInit (ARMul_State * state) { #ifndef NOOS #ifndef VALIDATE ARMword instr, i, j; struct OSblock *OSptr = (struct OSblock *) state->OSptr; if (state->OSptr == NULL) { state->OSptr = (unsigned char *) malloc (sizeof (struct OSblock)); if (state->OSptr == NULL) { perror ("OS Memory"); exit (15); } } OSptr = (struct OSblock *) state->OSptr; OSptr->ErrorP = 0; state->Reg[13] = ADDRSUPERSTACK; /* set up a stack for the current mode */ ARMul_SetReg (state, SVC32MODE, 13, ADDRSUPERSTACK); /* and for supervisor mode */ ARMul_SetReg (state, ABORT32MODE, 13, ADDRSUPERSTACK); /* and for abort 32 mode */ ARMul_SetReg (state, UNDEF32MODE, 13, ADDRSUPERSTACK); /* and for undef 32 mode */ ARMul_SetReg (state, SYSTEMMODE, 13, ADDRSUPERSTACK); /* and for system mode */ instr = 0xe59ff000 | (ADDRSOFTVECTORS - 8); /* load pc from soft vector */ for (i = ARMul_ResetV; i <= ARMFIQV; i += 4) ARMul_WriteWord (state, i, instr); /* write hardware vectors */ for (i = ARMul_ResetV; i <= ARMFIQV + 4; i += 4) { ARMul_WriteWord (state, ADDRSOFTVECTORS + i, SOFTVECTORCODE + i * 4); ARMul_WriteWord (state, ADDRSOFHANDLERS + 2 * i + 4L, SOFTVECTORCODE + sizeof (softvectorcode) - 4L); } for (i = 0; i < sizeof (softvectorcode); i += 4) ARMul_WriteWord (state, SOFTVECTORCODE + i, softvectorcode[i / 4]); for (i = 0; i < FOPEN_MAX; i++) OSptr->FileTable[i] = NULL; for (i = 0; i < UNIQUETEMPS; i++) OSptr->tempnames[i] = NULL; ARMul_ConsolePrint (state, ", Demon 1.01"); /* #ifndef ASIM */ /* install fpe */ for (i = 0; i < fpesize; i += 4) /* copy the code */ ARMul_WriteWord (state, FPESTART + i, fpecode[i >> 2]); for (i = FPESTART + fpesize;; i -= 4) { /* reverse the error strings */ if ((j = ARMul_ReadWord (state, i)) == 0xffffffff) break; if (state->bigendSig && j < 0x80000000) { /* it's part of the string so swap it */ j = ((j >> 0x18) & 0x000000ff) | ((j >> 0x08) & 0x0000ff00) | ((j << 0x08) & 0x00ff0000) | ((j << 0x18) & 0xff000000); ARMul_WriteWord (state, i, j); } } ARMul_WriteWord (state, FPEOLDVECT, ARMul_ReadWord (state, 4)); /* copy old illegal instr vector */ ARMul_WriteWord (state, 4, FPENEWVECT (ARMul_ReadWord (state, i - 4))); /* install new vector */ ARMul_ConsolePrint (state, ", FPE"); /* #endif ASIM */ #endif /* VALIDATE */ #endif /* NOOS */ return (TRUE); } void ARMul_OSExit (ARMul_State * state) { free ((char *) state->OSptr); } /***************************************************************************\ * Return the last Operating System Error. * \***************************************************************************/ ARMword ARMul_OSLastErrorP (ARMul_State * state) { return ((struct OSblock *) state->OSptr)->ErrorP; } static int translate_open_mode[] = { O_RDONLY, /* "r" */ O_RDONLY + O_BINARY, /* "rb" */ O_RDWR, /* "r+" */ O_RDWR + O_BINARY, /* "r+b" */ O_WRONLY + O_CREAT + O_TRUNC, /* "w" */ O_WRONLY + O_BINARY + O_CREAT + O_TRUNC, /* "wb" */ O_RDWR + O_CREAT + O_TRUNC, /* "w+" */ O_RDWR + O_BINARY + O_CREAT + O_TRUNC, /* "w+b" */ O_WRONLY + O_APPEND + O_CREAT, /* "a" */ O_WRONLY + O_BINARY + O_APPEND + O_CREAT, /* "ab" */ O_RDWR + O_APPEND + O_CREAT, /* "a+" */ O_RDWR + O_BINARY + O_APPEND + O_CREAT /* "a+b" */ }; static void SWIWrite0 (ARMul_State * state, ARMword addr) { ARMword temp; struct OSblock *OSptr = (struct OSblock *) state->OSptr; while ((temp = ARMul_ReadByte (state, addr++)) != 0) (void) fputc ((char) temp, stdout); OSptr->ErrorNo = errno; } static void WriteCommandLineTo (ARMul_State * state, ARMword addr) { ARMword temp; char *cptr = state->CommandLine; if (cptr == NULL) cptr = "\0"; do { temp = (ARMword) * cptr++; ARMul_WriteByte (state, addr++, temp); } while (temp != 0); } static void SWIopen (ARMul_State * state, ARMword name, ARMword SWIflags) { struct OSblock *OSptr = (struct OSblock *) state->OSptr; char dummy[2000]; int flags; int i; for (i = 0; (dummy[i] = ARMul_ReadByte (state, name + i)); i++) ; /* Now we need to decode the Demon open mode */ flags = translate_open_mode[SWIflags]; /* Filename ":tt" is special: it denotes stdin/out */ if (strcmp (dummy, ":tt") == 0) { if (flags == O_RDONLY) /* opening tty "r" */ state->Reg[0] = 0; /* stdin */ else state->Reg[0] = 1; /* stdout */ } else { state->Reg[0] = (int) open (dummy, flags, 0666); OSptr->ErrorNo = errno; } } static void SWIread (ARMul_State * state, ARMword f, ARMword ptr, ARMword len) { struct OSblock *OSptr = (struct OSblock *) state->OSptr; int res; int i; char *local = malloc (len); if (local == NULL) { fprintf (stderr, "sim: Unable to read 0x%ulx bytes - out of memory\n", len); return; } res = read (f, local, len); if (res > 0) for (i = 0; i < res; i++) ARMul_WriteByte (state, ptr + i, local[i]); free (local); state->Reg[0] = res == -1 ? -1 : len - res; OSptr->ErrorNo = errno; } static void SWIwrite (ARMul_State * state, ARMword f, ARMword ptr, ARMword len) { struct OSblock *OSptr = (struct OSblock *) state->OSptr; int res; ARMword i; char *local = malloc (len); if (local == NULL) { fprintf (stderr, "sim: Unable to write 0x%lx bytes - out of memory\n", (long) len); return; } for (i = 0; i < len; i++) local[i] = ARMul_ReadByte (state, ptr + i); res = write (f, local, len); state->Reg[0] = res == -1 ? -1 : len - res; free (local); OSptr->ErrorNo = errno; } static void SWIflen (ARMul_State * state, ARMword fh) { struct OSblock *OSptr = (struct OSblock *) state->OSptr; ARMword addr; if (fh == 0 || fh > FOPEN_MAX) { OSptr->ErrorNo = EBADF; state->Reg[0] = -1L; return; } addr = lseek (fh, 0, SEEK_CUR); state->Reg[0] = lseek (fh, 0L, SEEK_END); (void) lseek (fh, addr, SEEK_SET); OSptr->ErrorNo = errno; } /***************************************************************************\ * The emulator calls this routine when a SWI instruction is encuntered. The * * parameter passed is the SWI number (lower 24 bits of the instruction). * \***************************************************************************/ unsigned ARMul_OSHandleSWI (ARMul_State * state, ARMword number) { ARMword addr, temp; struct OSblock *OSptr = (struct OSblock *) state->OSptr; switch (number) { case SWI_Read: SWIread (state, state->Reg[0], state->Reg[1], state->Reg[2]); return TRUE; case SWI_Write: SWIwrite (state, state->Reg[0], state->Reg[1], state->Reg[2]); return TRUE; case SWI_Open: SWIopen (state, state->Reg[0], state->Reg[1]); return TRUE; case SWI_Clock: /* return number of centi-seconds... */ state->Reg[0] = #ifdef CLOCKS_PER_SEC (CLOCKS_PER_SEC >= 100) ? (ARMword) (clock () / (CLOCKS_PER_SEC / 100)) : (ARMword) ((clock () * 100) / CLOCKS_PER_SEC); #else /* presume unix... clock() returns microseconds */ (ARMword) (clock () / 10000); #endif OSptr->ErrorNo = errno; return (TRUE); case SWI_Time: state->Reg[0] = (ARMword) time (NULL); OSptr->ErrorNo = errno; return (TRUE); case SWI_Close: state->Reg[0] = close (state->Reg[0]); OSptr->ErrorNo = errno; return TRUE; case SWI_Flen: SWIflen (state, state->Reg[0]); return (TRUE); case SWI_Exit: state->Emulate = FALSE; return TRUE; case SWI_Seek: { /* We must return non-zero for failure */ state->Reg[0] = -1 >= lseek (state->Reg[0], state->Reg[1], SEEK_SET); OSptr->ErrorNo = errno; return TRUE; } case SWI_WriteC: (void) fputc ((int) state->Reg[0], stdout); OSptr->ErrorNo = errno; return (TRUE); case SWI_Write0: SWIWrite0 (state, state->Reg[0]); return (TRUE); case SWI_GetErrno: state->Reg[0] = OSptr->ErrorNo; return (TRUE); case SWI_Breakpoint: state->EndCondition = RDIError_BreakpointReached; state->Emulate = FALSE; return (TRUE); case SWI_GetEnv: state->Reg[0] = ADDRCMDLINE; if (state->MemSize) state->Reg[1] = state->MemSize; else state->Reg[1] = ADDRUSERSTACK; WriteCommandLineTo (state, state->Reg[0]); return (TRUE); /* Handle Angel SWIs as well as Demon ones */ case AngelSWI_ARM: case AngelSWI_Thumb: /* R1 is almost always a parameter block */ addr = state->Reg[1]; /* R0 is a reason code */ switch (state->Reg[0]) { /* Unimplemented reason codes */ case AngelSWI_Reason_ReadC: case AngelSWI_Reason_IsTTY: case AngelSWI_Reason_TmpNam: case AngelSWI_Reason_Remove: case AngelSWI_Reason_Rename: case AngelSWI_Reason_System: case AngelSWI_Reason_EnterSVC: default: state->Emulate = FALSE; return (FALSE); case AngelSWI_Reason_Clock: /* return number of centi-seconds... */ state->Reg[0] = #ifdef CLOCKS_PER_SEC (CLOCKS_PER_SEC >= 100) ? (ARMword) (clock () / (CLOCKS_PER_SEC / 100)) : (ARMword) ((clock () * 100) / CLOCKS_PER_SEC); #else /* presume unix... clock() returns microseconds */ (ARMword) (clock () / 10000); #endif OSptr->ErrorNo = errno; return (TRUE); case AngelSWI_Reason_Time: state->Reg[0] = (ARMword) time (NULL); OSptr->ErrorNo = errno; return (TRUE); case AngelSWI_Reason_WriteC: (void) fputc ((int) ARMul_ReadByte (state, addr), stdout); OSptr->ErrorNo = errno; return (TRUE); case AngelSWI_Reason_Write0: SWIWrite0 (state, addr); return (TRUE); case AngelSWI_Reason_Close: state->Reg[0] = close (ARMul_ReadWord (state, addr)); OSptr->ErrorNo = errno; return (TRUE); case AngelSWI_Reason_Seek: state->Reg[0] = -1 >= lseek (ARMul_ReadWord (state, addr), ARMul_ReadWord (state, addr + 4), SEEK_SET); OSptr->ErrorNo = errno; return (TRUE); case AngelSWI_Reason_FLen: SWIflen (state, ARMul_ReadWord (state, addr)); return (TRUE); case AngelSWI_Reason_GetCmdLine: WriteCommandLineTo (state, ARMul_ReadWord (state, addr)); return (TRUE); case AngelSWI_Reason_HeapInfo: /* R1 is a pointer to a pointer */ addr = ARMul_ReadWord (state, addr); /* Pick up the right memory limit */ if (state->MemSize) temp = state->MemSize; else temp = ADDRUSERSTACK; ARMul_WriteWord (state, addr, 0); /* Heap base */ ARMul_WriteWord (state, addr + 4, temp); /* Heap limit */ ARMul_WriteWord (state, addr + 8, temp); /* Stack base */ ARMul_WriteWord (state, addr + 12, temp); /* Stack limit */ return (TRUE); case AngelSWI_Reason_ReportException: if (state->Reg[1] == ADP_Stopped_ApplicationExit) state->Reg[0] = 0; else state->Reg[0] = -1; state->Emulate = FALSE; return TRUE; case ADP_Stopped_ApplicationExit: state->Reg[0] = 0; state->Emulate = FALSE; return (TRUE); case ADP_Stopped_RunTimeError: state->Reg[0] = -1; state->Emulate = FALSE; return (TRUE); case AngelSWI_Reason_Errno: state->Reg[0] = OSptr->ErrorNo; return (TRUE); case AngelSWI_Reason_Open: SWIopen (state, ARMul_ReadWord (state, addr), ARMul_ReadWord (state, addr + 4)); return TRUE; case AngelSWI_Reason_Read: SWIread (state, ARMul_ReadWord (state, addr), ARMul_ReadWord (state, addr + 4), ARMul_ReadWord (state, addr + 8)); return TRUE; case AngelSWI_Reason_Write: SWIwrite (state, ARMul_ReadWord (state, addr), ARMul_ReadWord (state, addr + 4), ARMul_ReadWord (state, addr + 8)); return TRUE; } default: state->Emulate = FALSE; return (FALSE); } } #ifndef NOOS #ifndef ASIM /***************************************************************************\ * The emulator calls this routine when an Exception occurs. The second * * parameter is the address of the relevant exception vector. Returning * * FALSE from this routine causes the trap to be taken, TRUE causes it to * * be ignored (so set state->Emulate to FALSE!). * \***************************************************************************/ unsigned ARMul_OSException (ARMul_State * state ATTRIBUTE_UNUSED, ARMword vector ATTRIBUTE_UNUSED, ARMword pc ATTRIBUTE_UNUSED) { /* don't use this here */ return (FALSE); } #endif #endif /* NOOS */