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binutils-gdb/sim/arm/armos.c
Mike Frysinger beb9aecf12 sim: arm: fix -Wimplicit-fallthrough warnings 
Replace some fall through comments with the attribute.
2023-12-21 01:59:22 -05:00

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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 3 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, see <http://www.gnu.org/licenses/>. */
/* 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. */
/* This must come before any other includes. */
#include "defs.h"
#include "ansidecl.h"
#include "libiberty.h"
#include <time.h>
#include <errno.h>
#include <limits.h>
#include <string.h>
#include <unistd.h> /* For SEEK_SET etc. */
#include "armdefs.h"
#include "armos.h"
#include "armemu.h"
#ifndef NOOS
#ifndef VALIDATE
/* #ifndef ASIM */
#include "armfpe.h"
/* #endif */
#endif
#endif
/* For RDIError_BreakpointReached. */
#include "dbg_rdi.h"
#include "sim/callback.h"
extern host_callback *sim_callback;
extern unsigned ARMul_OSInit (ARMul_State *);
extern unsigned ARMul_OSHandleSWI (ARMul_State *, ARMword);
#ifndef FOPEN_MAX
#define FOPEN_MAX 64
#endif
#ifndef PATH_MAX
#define PATH_MAX 1024
#endif
/* OS private Information. */
struct OSblock
{
ARMword ErrorNo;
};
/* Bit mask of enabled SWI implementations. */
unsigned int swi_mask = -1;
static ARMword softvectorcode[] =
{
/* Installed instructions:
swi tidyexception + event;
mov lr, pc;
ldmia fp, {fp, 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;
if (state->OSptr == NULL)
{
state->OSptr = (unsigned char *) malloc (sizeof (struct OSblock));
if (state->OSptr == NULL)
{
perror ("OS Memory");
exit (15);
}
}
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)
/* Write hardware vectors. */
ARMul_WriteWord (state, i, instr);
SWI_vector_installed = 0;
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]);
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]);
/* Scan backwards from the end of the code. */
for (i = FPESTART + fpesize;; i -= 4)
{
/* When we reach the marker value, break out of
the loop, leaving i pointing at the maker. */
if ((j = ARMul_ReadWord (state, i)) == 0xffffffff)
break;
/* If necessary, reverse the error strings. */
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);
}
}
/* Copy old illegal instr vector. */
ARMul_WriteWord (state, FPEOLDVECT, ARMul_ReadWord (state, ARMUndefinedInstrV));
/* Install new vector. */
ARMul_WriteWord (state, ARMUndefinedInstrV, FPENEWVECT (ARMul_ReadWord (state, i - 4)));
ARMul_ConsolePrint (state, ", FPE");
/* #endif ASIM */
#endif /* VALIDATE */
#endif /* NOOS */
/* Intel do not want DEMON SWI support. */
if (state->is_XScale)
swi_mask = SWI_MASK_ANGEL;
return TRUE;
}
/* These are libgloss defines, but seem to be common across all supported ARM
targets at the moment. These should get moved to the callback open_map. */
#define TARGET_O_BINARY 0
#define TARGET_O_APPEND 0x8
#define TARGET_O_CREAT 0x200
#define TARGET_O_RDONLY 0x0
#define TARGET_O_RDWR 0x2
#define TARGET_O_TRUNC 0x400
#define TARGET_O_WRONLY 0x1
static const int translate_open_mode[] =
{
TARGET_O_RDONLY, /* "r" */
TARGET_O_RDONLY + TARGET_O_BINARY, /* "rb" */
TARGET_O_RDWR, /* "r+" */
TARGET_O_RDWR + TARGET_O_BINARY, /* "r+b" */
TARGET_O_WRONLY + TARGET_O_CREAT + TARGET_O_TRUNC, /* "w" */
TARGET_O_WRONLY + TARGET_O_BINARY + TARGET_O_CREAT + TARGET_O_TRUNC, /* "wb" */
TARGET_O_RDWR + TARGET_O_CREAT + TARGET_O_TRUNC, /* "w+" */
TARGET_O_RDWR + TARGET_O_BINARY + TARGET_O_CREAT + TARGET_O_TRUNC, /* "w+b" */
TARGET_O_WRONLY + TARGET_O_APPEND + TARGET_O_CREAT, /* "a" */
TARGET_O_WRONLY + TARGET_O_BINARY + TARGET_O_APPEND + TARGET_O_CREAT, /* "ab" */
TARGET_O_RDWR + TARGET_O_APPEND + TARGET_O_CREAT, /* "a+" */
TARGET_O_RDWR + TARGET_O_BINARY + TARGET_O_APPEND + TARGET_O_CREAT /* "a+b" */
};
static void
SWIWrite0 (ARMul_State * state, ARMword addr)
{
ARMword temp;
struct OSblock *OSptr = (struct OSblock *) state->OSptr;
while ((temp = ARMul_SafeReadByte (state, addr++)) != 0)
{
char buffer = temp;
/* Note - we cannot just cast 'temp' to a (char *) here,
since on a big-endian host the byte value will end
up in the wrong place and a nul character will be printed. */
(void) sim_callback->write_stdout (sim_callback, & buffer, 1);
}
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
}
static void
WriteCommandLineTo (ARMul_State * state, ARMword addr)
{
ARMword temp;
char *cptr = state->CommandLine;
if (cptr == NULL)
cptr = "\0";
do
{
temp = (ARMword) * cptr++;
ARMul_SafeWriteByte (state, addr++, temp);
}
while (temp != 0);
}
static int
ReadFileName (ARMul_State * state, char *buf, ARMword src, size_t n)
{
struct OSblock *OSptr = (struct OSblock *) state->OSptr;
char *p = buf;
while (n--)
if ((*p++ = ARMul_SafeReadByte (state, src++)) == '\0')
return 0;
OSptr->ErrorNo = cb_host_to_target_errno (sim_callback, ENAMETOOLONG);
state->Reg[0] = -1;
return -1;
}
static void
SWIopen (ARMul_State * state, ARMword name, ARMword SWIflags)
{
struct OSblock *OSptr = (struct OSblock *) state->OSptr;
char buf[PATH_MAX];
int flags;
if (ReadFileName (state, buf, name, sizeof buf) == -1)
return;
/* Now we need to decode the Demon open mode. */
if (SWIflags >= ARRAY_SIZE (translate_open_mode))
flags = 0;
else
flags = translate_open_mode[SWIflags];
/* Filename ":tt" is special: it denotes stdin/out. */
if (strcmp (buf, ":tt") == 0)
{
if (flags == TARGET_O_RDONLY) /* opening tty "r" */
state->Reg[0] = 0; /* stdin */
else
state->Reg[0] = 1; /* stdout */
}
else
{
state->Reg[0] = sim_callback->open (sim_callback, buf, flags);
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
}
}
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)
{
sim_callback->printf_filtered
(sim_callback,
"sim: Unable to read 0x%lx bytes - out of memory\n",
(long)len);
return;
}
res = sim_callback->read (sim_callback, f, local, len);
if (res > 0)
for (i = 0; i < res; i++)
ARMul_SafeWriteByte (state, ptr + i, local[i]);
free (local);
state->Reg[0] = res == -1 ? -1 : len - res;
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
}
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)
{
sim_callback->printf_filtered
(sim_callback,
"sim: Unable to write 0x%lx bytes - out of memory\n",
(long) len);
return;
}
for (i = 0; i < len; i++)
local[i] = ARMul_SafeReadByte (state, ptr + i);
res = sim_callback->write (sim_callback, f, local, len);
state->Reg[0] = res == -1 ? -1 : len - res;
free (local);
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
}
static void
SWIflen (ARMul_State * state, ARMword fh)
{
struct OSblock *OSptr = (struct OSblock *) state->OSptr;
ARMword addr;
if (fh > FOPEN_MAX)
{
OSptr->ErrorNo = EBADF;
state->Reg[0] = -1L;
return;
}
addr = sim_callback->lseek (sim_callback, fh, 0, SEEK_CUR);
state->Reg[0] = sim_callback->lseek (sim_callback, fh, 0L, SEEK_END);
(void) sim_callback->lseek (sim_callback, fh, addr, SEEK_SET);
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
}
static void
SWIremove (ARMul_State * state, ARMword path)
{
char buf[PATH_MAX];
if (ReadFileName (state, buf, path, sizeof buf) != -1)
{
struct OSblock *OSptr = (struct OSblock *) state->OSptr;
state->Reg[0] = sim_callback->unlink (sim_callback, buf);
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
}
}
static void
SWIrename (ARMul_State * state, ARMword old, ARMword new)
{
char oldbuf[PATH_MAX], newbuf[PATH_MAX];
if (ReadFileName (state, oldbuf, old, sizeof oldbuf) != -1
&& ReadFileName (state, newbuf, new, sizeof newbuf) != -1)
{
struct OSblock *OSptr = (struct OSblock *) state->OSptr;
state->Reg[0] = sim_callback->rename (sim_callback, oldbuf, newbuf);
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
}
}
/* 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)
{
struct OSblock * OSptr = (struct OSblock *) state->OSptr;
int unhandled = FALSE;
switch (number)
{
case SWI_Read:
if (swi_mask & SWI_MASK_DEMON)
SWIread (state, state->Reg[0], state->Reg[1], state->Reg[2]);
else
unhandled = TRUE;
break;
case SWI_Write:
if (swi_mask & SWI_MASK_DEMON)
SWIwrite (state, state->Reg[0], state->Reg[1], state->Reg[2]);
else
unhandled = TRUE;
break;
case SWI_Open:
if (swi_mask & SWI_MASK_DEMON)
SWIopen (state, state->Reg[0], state->Reg[1]);
else
unhandled = TRUE;
break;
case SWI_Clock:
if (swi_mask & SWI_MASK_DEMON)
{
/* 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;
}
else
unhandled = TRUE;
break;
case SWI_Time:
if (swi_mask & SWI_MASK_DEMON)
{
state->Reg[0] = (ARMword) sim_callback->time (sim_callback);
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
}
else
unhandled = TRUE;
break;
case SWI_Close:
if (swi_mask & SWI_MASK_DEMON)
{
state->Reg[0] = sim_callback->close (sim_callback, state->Reg[0]);
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
}
else
unhandled = TRUE;
break;
case SWI_Flen:
if (swi_mask & SWI_MASK_DEMON)
SWIflen (state, state->Reg[0]);
else
unhandled = TRUE;
break;
case SWI_Exit:
if (swi_mask & SWI_MASK_DEMON)
state->Emulate = FALSE;
else
unhandled = TRUE;
break;
case SWI_Seek:
if (swi_mask & SWI_MASK_DEMON)
{
/* We must return non-zero for failure. */
state->Reg[0] = -1 >= sim_callback->lseek (sim_callback, state->Reg[0], state->Reg[1], SEEK_SET);
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
}
else
unhandled = TRUE;
break;
case SWI_WriteC:
if (swi_mask & SWI_MASK_DEMON)
{
char tmp = state->Reg[0];
(void) sim_callback->write_stdout (sim_callback, &tmp, 1);
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
}
else
unhandled = TRUE;
break;
case SWI_Write0:
if (swi_mask & SWI_MASK_DEMON)
SWIWrite0 (state, state->Reg[0]);
else
unhandled = TRUE;
break;
case SWI_GetErrno:
if (swi_mask & SWI_MASK_DEMON)
state->Reg[0] = OSptr->ErrorNo;
else
unhandled = TRUE;
break;
case SWI_GetEnv:
if (swi_mask & SWI_MASK_DEMON)
{
state->Reg[0] = ADDRCMDLINE;
if (state->MemSize)
state->Reg[1] = state->MemSize;
else
state->Reg[1] = ADDRUSERSTACK;
WriteCommandLineTo (state, state->Reg[0]);
}
else
unhandled = TRUE;
break;
case SWI_Breakpoint:
state->EndCondition = RDIError_BreakpointReached;
state->Emulate = FALSE;
break;
case SWI_Remove:
if (swi_mask & SWI_MASK_DEMON)
SWIremove (state, state->Reg[0]);
else
unhandled = TRUE;
break;
case SWI_Rename:
if (swi_mask & SWI_MASK_DEMON)
SWIrename (state, state->Reg[0], state->Reg[1]);
else
unhandled = TRUE;
break;
case SWI_IsTTY:
if (swi_mask & SWI_MASK_DEMON)
{
state->Reg[0] = sim_callback->isatty (sim_callback, state->Reg[0]);
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
}
else
unhandled = TRUE;
break;
/* Handle Angel SWIs as well as Demon ones. */
case AngelSWI_ARM:
case AngelSWI_Thumb:
if (swi_mask & SWI_MASK_ANGEL)
{
ARMword addr;
ARMword temp;
/* R1 is almost always a parameter block. */
addr = state->Reg[1];
/* R0 is a reason code. */
switch (state->Reg[0])
{
case -1:
/* This can happen when a SWI is interrupted (eg receiving a
ctrl-C whilst processing SWIRead()). The SWI will complete
returning -1 in r0 to the caller. If GDB is then used to
resume the system call the reason code will now be -1. */
return TRUE;
/* Unimplemented reason codes. */
case AngelSWI_Reason_ReadC:
case AngelSWI_Reason_TmpNam:
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;
break;
case AngelSWI_Reason_Time:
state->Reg[0] = (ARMword) sim_callback->time (sim_callback);
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
break;
case AngelSWI_Reason_WriteC:
{
char tmp = ARMul_SafeReadByte (state, addr);
(void) sim_callback->write_stdout (sim_callback, &tmp, 1);
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
break;
}
case AngelSWI_Reason_Write0:
SWIWrite0 (state, addr);
break;
case AngelSWI_Reason_Close:
state->Reg[0] = sim_callback->close (sim_callback, ARMul_ReadWord (state, addr));
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
break;
case AngelSWI_Reason_Seek:
state->Reg[0] = -1 >= sim_callback->lseek (sim_callback, ARMul_ReadWord (state, addr),
ARMul_ReadWord (state, addr + 4),
SEEK_SET);
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
break;
case AngelSWI_Reason_FLen:
SWIflen (state, ARMul_ReadWord (state, addr));
break;
case AngelSWI_Reason_GetCmdLine:
WriteCommandLineTo (state, ARMul_ReadWord (state, addr));
break;
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. */
break;
case AngelSWI_Reason_ReportException:
if (state->Reg[1] == ADP_Stopped_ApplicationExit)
state->Reg[0] = 0;
else
state->Reg[0] = -1;
state->Emulate = FALSE;
break;
case ADP_Stopped_ApplicationExit:
state->Reg[0] = 0;
state->Emulate = FALSE;
break;
case ADP_Stopped_RunTimeError:
state->Reg[0] = -1;
state->Emulate = FALSE;
break;
case AngelSWI_Reason_Errno:
state->Reg[0] = OSptr->ErrorNo;
break;
case AngelSWI_Reason_Open:
SWIopen (state,
ARMul_ReadWord (state, addr),
ARMul_ReadWord (state, addr + 4));
break;
case AngelSWI_Reason_Read:
SWIread (state,
ARMul_ReadWord (state, addr),
ARMul_ReadWord (state, addr + 4),
ARMul_ReadWord (state, addr + 8));
break;
case AngelSWI_Reason_Write:
SWIwrite (state,
ARMul_ReadWord (state, addr),
ARMul_ReadWord (state, addr + 4),
ARMul_ReadWord (state, addr + 8));
break;
case AngelSWI_Reason_IsTTY:
state->Reg[0] = sim_callback->isatty (sim_callback,
ARMul_ReadWord (state, addr));
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
break;
case AngelSWI_Reason_Remove:
SWIremove (state,
ARMul_ReadWord (state, addr));
break;
case AngelSWI_Reason_Rename:
SWIrename (state,
ARMul_ReadWord (state, addr),
ARMul_ReadWord (state, addr + 4));
break;
}
}
else
unhandled = TRUE;
break;
/* The following SWIs are generated by the softvectorcode[]
installed by default by the simulator. */
case 0x91: /* Undefined Instruction. */
{
ARMword addr = state->RegBank[UNDEFBANK][14] - 4;
sim_callback->printf_filtered
(sim_callback, "sim: exception: Unhandled Instruction '0x%08x' at 0x%08x. Stopping.\n",
ARMul_ReadWord (state, addr), addr);
state->EndCondition = RDIError_SoftwareInterrupt;
state->Emulate = FALSE;
return FALSE;
}
case 0x90: /* Reset. */
case 0x92: /* SWI. */
/* These two can be safely ignored. */
break;
case 0x93: /* Prefetch Abort. */
case 0x94: /* Data Abort. */
case 0x95: /* Address Exception. */
case 0x96: /* IRQ. */
case 0x97: /* FIQ. */
case 0x98: /* Error. */
unhandled = TRUE;
break;
case -1:
/* This can happen when a SWI is interrupted (eg receiving a
ctrl-C whilst processing SWIRead()). The SWI will complete
returning -1 in r0 to the caller. If GDB is then used to
resume the system call the reason code will now be -1. */
return TRUE;
case 0x180001: /* RedBoot's Syscall SWI in ARM mode. */
if (swi_mask & SWI_MASK_REDBOOT)
{
switch (state->Reg[0])
{
/* These numbers are defined in libgloss/syscall.h
but the simulator should not be dependend upon
libgloss being installed. */
case 1: /* Exit. */
state->Emulate = FALSE;
/* Copy exit code into r0. */
state->Reg[0] = state->Reg[1];
break;
case 2: /* Open. */
SWIopen (state, state->Reg[1], state->Reg[2]);
break;
case 3: /* Close. */
state->Reg[0] = sim_callback->close (sim_callback, state->Reg[1]);
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
break;
case 4: /* Read. */
SWIread (state, state->Reg[1], state->Reg[2], state->Reg[3]);
break;
case 5: /* Write. */
SWIwrite (state, state->Reg[1], state->Reg[2], state->Reg[3]);
break;
case 6: /* Lseek. */
state->Reg[0] = sim_callback->lseek (sim_callback,
state->Reg[1],
state->Reg[2],
state->Reg[3]);
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
break;
case 17: /* Utime. */
state->Reg[0] = state->Reg[1] = (ARMword) sim_callback->time (sim_callback);
OSptr->ErrorNo = sim_callback->get_errno (sim_callback);
break;
case 7: /* Unlink. */
case 8: /* Getpid. */
case 9: /* Kill. */
case 10: /* Fstat. */
case 11: /* Sbrk. */
case 12: /* Argvlen. */
case 13: /* Argv. */
case 14: /* ChDir. */
case 15: /* Stat. */
case 16: /* Chmod. */
case 18: /* Time. */
sim_callback->printf_filtered
(sim_callback,
"sim: unhandled RedBoot syscall `%d' encountered - "
"returning ENOSYS\n",
state->Reg[0]);
state->Reg[0] = -1;
OSptr->ErrorNo = cb_host_to_target_errno
(sim_callback, ENOSYS);
break;
case 1001: /* Meminfo. */
{
ARMword totmem = state->Reg[1],
topmem = state->Reg[2];
ARMword stack = state->MemSize > 0
? state->MemSize : ADDRUSERSTACK;
if (totmem != 0)
ARMul_WriteWord (state, totmem, stack);
if (topmem != 0)
ARMul_WriteWord (state, topmem, stack);
state->Reg[0] = 0;
break;
}
default:
sim_callback->printf_filtered
(sim_callback,
"sim: unknown RedBoot syscall '%d' encountered - ignoring\n",
state->Reg[0]);
return FALSE;
}
break;
}
ATTRIBUTE_FALLTHROUGH;
default:
unhandled = TRUE;
}
if (unhandled)
{
if (SWI_vector_installed)
{
ARMword cpsr;
ARMword i_size;
cpsr = ARMul_GetCPSR (state);
i_size = INSN_SIZE;
ARMul_SetSPSR (state, SVC32MODE, cpsr);
cpsr &= ~0xbf;
cpsr |= SVC32MODE | 0x80;
ARMul_SetCPSR (state, cpsr);
state->RegBank[SVCBANK][14] = state->Reg[14] = state->Reg[15] - i_size;
state->NextInstr = RESUME;
state->Reg[15] = state->pc = ARMSWIV;
FLUSHPIPE;
}
else
{
sim_callback->printf_filtered
(sim_callback,
"sim: unknown SWI encountered - %x - ignoring\n",
number);
return FALSE;
}
}
return TRUE;
}
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