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old-cross-binutils/sim/arm/armos.c
Nick Clifton c1a72ffdd6 Add support for v4 SystemMode.
2000-05-30 17:13:37 +00:00

615 lines
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/* 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 <time.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#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 <unistd.h> /* For SEEK_SET etc */
#endif
#ifdef __riscos
extern int _fisatty (FILE *);
#define isatty_(f) _fisatty(f)
#else
#ifdef __ZTC__
#include <io.h>
#define isatty_(f) isatty((f)->_file)
#else
#ifdef macintosh
#include <ioctl.h>
#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 */
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