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