arm-semi.c
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/*
* Arm "Angel" semihosting syscalls
*
* Copyright (c) 2005 CodeSourcery, LLC. Written by Paul Brook.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "qemu.h"
#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024)
#define SYS_OPEN 0x01
#define SYS_CLOSE 0x02
#define SYS_WRITEC 0x03
#define SYS_WRITE0 0x04
#define SYS_WRITE 0x05
#define SYS_READ 0x06
#define SYS_READC 0x07
#define SYS_ISTTY 0x09
#define SYS_SEEK 0x0a
#define SYS_FLEN 0x0c
#define SYS_TMPNAM 0x0d
#define SYS_REMOVE 0x0e
#define SYS_RENAME 0x0f
#define SYS_CLOCK 0x10
#define SYS_TIME 0x11
#define SYS_SYSTEM 0x12
#define SYS_ERRNO 0x13
#define SYS_GET_CMDLINE 0x15
#define SYS_HEAPINFO 0x16
#define SYS_EXIT 0x18
#ifndef O_BINARY
#define O_BINARY 0
#endif
int open_modeflags[12] = {
O_RDONLY,
O_RDONLY | O_BINARY,
O_RDWR,
O_RDWR | O_BINARY,
O_WRONLY | O_CREAT | O_TRUNC,
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
O_RDWR | O_CREAT | O_TRUNC,
O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
O_WRONLY | O_CREAT | O_APPEND,
O_WRONLY | O_CREAT | O_APPEND | O_BINARY,
O_RDWR | O_CREAT | O_APPEND,
O_RDWR | O_CREAT | O_APPEND | O_BINARY
};
static inline uint32_t set_swi_errno(TaskState *ts, uint32_t code)
{
if (code == (uint32_t)-1)
ts->swi_errno = errno;
return code;
}
#define ARG(x) tswap32(args[x])
uint32_t do_arm_semihosting(CPUState *env)
{
uint32_t *args;
char * s;
int nr;
uint32_t ret;
TaskState *ts = env->opaque;
nr = env->regs[0];
args = (uint32_t *)env->regs[1];
switch (nr) {
case SYS_OPEN:
s = (char *)ARG(0);
if (ARG(1) >= 12)
return (uint32_t)-1;
if (strcmp(s, ":tt") == 0) {
if (ARG(1) < 4)
return STDIN_FILENO;
else
return STDOUT_FILENO;
}
return set_swi_errno(ts, open(s, open_modeflags[ARG(1)], 0644));
case SYS_CLOSE:
return set_swi_errno(ts, close(ARG(0)));
case SYS_WRITEC:
/* Write to debug console. stderr is near enough. */
return write(STDERR_FILENO, args, 1);
case SYS_WRITE0:
s = (char *)args;
return write(STDERR_FILENO, s, strlen(s));
case SYS_WRITE:
ret = set_swi_errno(ts, write(ARG(0), (void *)ARG(1), ARG(2)));
if (ret == (uint32_t)-1)
return -1;
return ARG(2) - ret;
case SYS_READ:
ret = set_swi_errno(ts, read(ARG(0), (void *)ARG(1), ARG(2)));
if (ret == (uint32_t)-1)
return -1;
return ARG(2) - ret;
case SYS_READC:
/* XXX: Read from debug cosole. Not implemented. */
return 0;
case SYS_ISTTY:
return isatty(ARG(0));
case SYS_SEEK:
ret = set_swi_errno(ts, lseek(ARG(0), ARG(1), SEEK_SET));
if (ret == (uint32_t)-1)
return -1;
return 0;
case SYS_FLEN:
{
struct stat buf;
ret = set_swi_errno(ts, fstat(ARG(0), &buf));
if (ret == (uint32_t)-1)
return -1;
return buf.st_size;
}
case SYS_TMPNAM:
/* XXX: Not implemented. */
return -1;
case SYS_REMOVE:
return set_swi_errno(ts, remove((char *)ARG(0)));
case SYS_RENAME:
return set_swi_errno(ts, rename((char *)ARG(0), (char *)ARG(2)));
case SYS_CLOCK:
return clock() / (CLOCKS_PER_SEC / 100);
case SYS_TIME:
return set_swi_errno(ts, time(NULL));
case SYS_SYSTEM:
return set_swi_errno(ts, system((char *)ARG(0)));
case SYS_ERRNO:
return ts->swi_errno;
case SYS_GET_CMDLINE:
/* XXX: Not implemented. */
s = (char *)ARG(0);
*s = 0;
return -1;
case SYS_HEAPINFO:
{
uint32_t *ptr;
uint32_t limit;
/* Some C llibraries assume the heap immediately follows .bss, so
allocate it using sbrk. */
if (!ts->heap_limit) {
long ret;
ts->heap_base = do_brk(NULL);
limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
/* Try a big heap, and reduce the size if that fails. */
for (;;) {
ret = do_brk((char *)limit);
if (ret != -1)
break;
limit = (ts->heap_base >> 1) + (limit >> 1);
}
ts->heap_limit = limit;
}
ptr = (uint32_t *)ARG(0);
ptr[0] = tswap32(ts->heap_base);
ptr[1] = tswap32(ts->heap_limit);
ptr[2] = tswap32(ts->stack_base);
ptr[3] = tswap32(0); /* Stack limit. */
return 0;
}
case SYS_EXIT:
exit(0);
default:
fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
cpu_dump_state(env, stderr, fprintf, 0);
abort();
}
}