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qemu/arm-semi.c
pbrook 8e71621f78 Add ARM Angel semihosting to system emulation. 
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2340 c046a42c-6fe2-441c-8c8c-71466251a162
2007-01-20 17:12:09 +00:00

346 lines
9.6 KiB
C
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/*
* Arm "Angel" semihosting syscalls
*
* Copyright (c) 2005, 2007 CodeSourcery.
* 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 "cpu.h"
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024)
#else
#include "vl.h"
#endif
#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
};
#ifdef CONFIG_USER_ONLY
static inline uint32_t set_swi_errno(TaskState *ts, uint32_t code)
{
if (code == (uint32_t)-1)
ts->swi_errno = errno;
return code;
}
#else
static inline uint32_t set_swi_errno(CPUState *env, uint32_t code)
{
return code;
}
static uint32_t softmmu_tget32(CPUState *env, uint32_t addr)
{
uint32_t val;
cpu_memory_rw_debug(env, addr, (uint8_t *)&val, 4, 0);
return tswap32(val);
}
static uint32_t softmmu_tget8(CPUState *env, uint32_t addr)
{
uint8_t val;
cpu_memory_rw_debug(env, addr, &val, 1, 0);
return val;
}
#define tget32(p) softmmu_tget32(env, p)
#define tget8(p) softmmu_tget8(env, p)
static void *softmmu_lock_user(CPUState *env, uint32_t addr, uint32_t len,
int copy)
{
char *p;
/* TODO: Make this something that isn't fixed size. */
p = malloc(len);
if (copy)
cpu_memory_rw_debug(env, addr, p, len, 0);
return p;
}
#define lock_user(p, len, copy) softmmu_lock_user(env, p, len, copy)
static char *softmmu_lock_user_string(CPUState *env, uint32_t addr)
{
char *p;
char *s;
uint8_t c;
/* TODO: Make this something that isn't fixed size. */
s = p = malloc(1024);
do {
cpu_memory_rw_debug(env, addr, &c, 1, 0);
addr++;
*(p++) = c;
} while (c);
return s;
}
#define lock_user_string(p) softmmu_lock_user_string(env, p)
static void softmmu_unlock_user(CPUState *env, void *p, target_ulong addr,
target_ulong len)
{
if (len)
cpu_memory_rw_debug(env, addr, p, len, 1);
free(p);
}
#define unlock_user(s, args, len) softmmu_unlock_user(env, s, args, len)
#endif
#define ARG(n) tget32(args + (n) * 4)
#define SET_ARG(n, val) tput32(args + (n) * 4,val)
uint32_t do_arm_semihosting(CPUState *env)
{
target_ulong args;
char * s;
int nr;
uint32_t ret;
uint32_t len;
#ifdef CONFIG_USER_ONLY
TaskState *ts = env->opaque;
#else
CPUState *ts = env;
#endif
nr = env->regs[0];
args = env->regs[1];
switch (nr) {
case SYS_OPEN:
s = lock_user_string(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;
}
ret = set_swi_errno(ts, open(s, open_modeflags[ARG(1)], 0644));
unlock_user(s, ARG(0), 0);
return ret;
case SYS_CLOSE:
return set_swi_errno(ts, close(ARG(0)));
case SYS_WRITEC:
{
char c = tget8(args);
/* Write to debug console. stderr is near enough. */
return write(STDERR_FILENO, &c, 1);
}
case SYS_WRITE0:
s = lock_user_string(args);
ret = write(STDERR_FILENO, s, strlen(s));
unlock_user(s, args, 0);
return ret;
case SYS_WRITE:
len = ARG(2);
s = lock_user(ARG(1), len, 1);
ret = set_swi_errno(ts, write(ARG(0), s, len));
unlock_user(s, ARG(1), 0);
if (ret == (uint32_t)-1)
return -1;
return ARG(2) - ret;
case SYS_READ:
len = ARG(2);
s = lock_user(ARG(1), len, 0);
do
ret = set_swi_errno(ts, read(ARG(0), s, len));
while (ret == -1 && errno == EINTR);
unlock_user(s, ARG(1), len);
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:
s = lock_user_string(ARG(0));
ret = set_swi_errno(ts, remove(s));
unlock_user(s, ARG(0), 0);
return ret;
case SYS_RENAME:
{
char *s2;
s = lock_user_string(ARG(0));
s2 = lock_user_string(ARG(2));
ret = set_swi_errno(ts, rename(s, s2));
unlock_user(s2, ARG(2), 0);
unlock_user(s, ARG(0), 0);
return ret;
}
case SYS_CLOCK:
return clock() / (CLOCKS_PER_SEC / 100);
case SYS_TIME:
return set_swi_errno(ts, time(NULL));
case SYS_SYSTEM:
s = lock_user_string(ARG(0));
ret = set_swi_errno(ts, system(s));
unlock_user(s, ARG(0), 0);
case SYS_ERRNO:
#ifdef CONFIG_USER_ONLY
return ts->swi_errno;
#else
return 0;
#endif
case SYS_GET_CMDLINE:
#ifdef CONFIG_USER_ONLY
/* Build a commandline from the original argv. */
{
char **arg = ts->info->host_argv;
int len = ARG(1);
/* lock the buffer on the ARM side */
char *cmdline_buffer = (char*)lock_user(ARG(0), len, 0);
s = cmdline_buffer;
while (*arg && len > 2) {
int n = strlen(*arg);
if (s != cmdline_buffer) {
*(s++) = ' ';
len--;
}
if (n >= len)
n = len - 1;
memcpy(s, *arg, n);
s += n;
len -= n;
arg++;
}
/* Null terminate the string. */
*s = 0;
len = s - cmdline_buffer;
/* Unlock the buffer on the ARM side. */
unlock_user(cmdline_buffer, ARG(0), len);
/* Adjust the commandline length argument. */
SET_ARG(1, len);
/* Return success if commandline fit into buffer. */
return *arg ? -1 : 0;
}
#else
return -1;
#endif
case SYS_HEAPINFO:
{
uint32_t *ptr;
uint32_t limit;
#ifdef CONFIG_USER_ONLY
/* Some C libraries assume the heap immediately follows .bss, so
allocate it using sbrk. */
if (!ts->heap_limit) {
long ret;
ts->heap_base = do_brk(0);
limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
/* Try a big heap, and reduce the size if that fails. */
for (;;) {
ret = do_brk(limit);
if (ret != -1)
break;
limit = (ts->heap_base >> 1) + (limit >> 1);
}
ts->heap_limit = limit;
}
ptr = lock_user(ARG(0), 16, 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. */
unlock_user(ptr, ARG(0), 16);
#else
limit = ram_size;
ptr = lock_user(ARG(0), 16, 0);
/* TODO: Make this use the limit of the loaded application. */
ptr[0] = tswap32(limit / 2);
ptr[1] = tswap32(limit);
ptr[2] = tswap32(limit); /* Stack base */
ptr[3] = tswap32(0); /* Stack limit. */
unlock_user(ptr, ARG(0), 16);
#endif
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();
}
}
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