git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2216 c046a42c-6fe2-441c-8c8c-71466251a162
236 lines
6.9 KiB
C
236 lines
6.9 KiB
C
/*
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* Arm "Angel" semihosting syscalls
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*
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* Copyright (c) 2005 CodeSourcery, LLC. Written by Paul Brook.
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*
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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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*
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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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*
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <time.h>
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#include "qemu.h"
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#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024)
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#define SYS_OPEN 0x01
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#define SYS_CLOSE 0x02
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#define SYS_WRITEC 0x03
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#define SYS_WRITE0 0x04
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#define SYS_WRITE 0x05
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#define SYS_READ 0x06
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#define SYS_READC 0x07
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#define SYS_ISTTY 0x09
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#define SYS_SEEK 0x0a
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#define SYS_FLEN 0x0c
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#define SYS_TMPNAM 0x0d
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#define SYS_REMOVE 0x0e
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#define SYS_RENAME 0x0f
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#define SYS_CLOCK 0x10
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#define SYS_TIME 0x11
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#define SYS_SYSTEM 0x12
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#define SYS_ERRNO 0x13
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#define SYS_GET_CMDLINE 0x15
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#define SYS_HEAPINFO 0x16
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#define SYS_EXIT 0x18
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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int open_modeflags[12] = {
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O_RDONLY,
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O_RDONLY | O_BINARY,
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O_RDWR,
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O_RDWR | O_BINARY,
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O_WRONLY | O_CREAT | O_TRUNC,
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O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
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O_RDWR | O_CREAT | O_TRUNC,
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O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
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O_WRONLY | O_CREAT | O_APPEND,
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O_WRONLY | O_CREAT | O_APPEND | O_BINARY,
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O_RDWR | O_CREAT | O_APPEND,
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O_RDWR | O_CREAT | O_APPEND | O_BINARY
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};
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static inline uint32_t set_swi_errno(TaskState *ts, uint32_t code)
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{
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if (code == (uint32_t)-1)
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ts->swi_errno = errno;
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return code;
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}
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#define ARG(n) tget32(args + (n) * 4)
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#define SET_ARG(n, val) tput32(args + (n) * 4,val)
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uint32_t do_arm_semihosting(CPUState *env)
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{
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target_ulong args;
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char * s;
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int nr;
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uint32_t ret;
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TaskState *ts = env->opaque;
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nr = env->regs[0];
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args = env->regs[1];
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switch (nr) {
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case SYS_OPEN:
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s = (char *)g2h(ARG(0));
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if (ARG(1) >= 12)
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return (uint32_t)-1;
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if (strcmp(s, ":tt") == 0) {
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if (ARG(1) < 4)
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return STDIN_FILENO;
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else
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return STDOUT_FILENO;
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}
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return set_swi_errno(ts, open(s, open_modeflags[ARG(1)], 0644));
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case SYS_CLOSE:
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return set_swi_errno(ts, close(ARG(0)));
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case SYS_WRITEC:
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{
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char c = tget8(args);
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/* Write to debug console. stderr is near enough. */
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return write(STDERR_FILENO, &c, 1);
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}
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case SYS_WRITE0:
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s = lock_user_string(args);
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ret = write(STDERR_FILENO, s, strlen(s));
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unlock_user(s, args, 0);
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return ret;
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case SYS_WRITE:
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ret = set_swi_errno(ts, write(ARG(0), g2h(ARG(1)), ARG(2)));
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if (ret == (uint32_t)-1)
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return -1;
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return ARG(2) - ret;
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case SYS_READ:
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ret = set_swi_errno(ts, read(ARG(0), g2h(ARG(1)), ARG(2)));
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if (ret == (uint32_t)-1)
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return -1;
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return ARG(2) - ret;
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case SYS_READC:
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/* XXX: Read from debug cosole. Not implemented. */
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return 0;
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case SYS_ISTTY:
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return isatty(ARG(0));
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case SYS_SEEK:
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ret = set_swi_errno(ts, lseek(ARG(0), ARG(1), SEEK_SET));
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if (ret == (uint32_t)-1)
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return -1;
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return 0;
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case SYS_FLEN:
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{
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struct stat buf;
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ret = set_swi_errno(ts, fstat(ARG(0), &buf));
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if (ret == (uint32_t)-1)
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return -1;
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return buf.st_size;
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}
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case SYS_TMPNAM:
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/* XXX: Not implemented. */
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return -1;
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case SYS_REMOVE:
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return set_swi_errno(ts, remove((char *)g2h(ARG(0))));
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case SYS_RENAME:
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return set_swi_errno(ts, rename((char *)g2h(ARG(0)),
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(char *)g2h(ARG(2))));
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case SYS_CLOCK:
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return clock() / (CLOCKS_PER_SEC / 100);
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case SYS_TIME:
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return set_swi_errno(ts, time(NULL));
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case SYS_SYSTEM:
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return set_swi_errno(ts, system((char *)g2h(ARG(0))));
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case SYS_ERRNO:
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return ts->swi_errno;
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case SYS_GET_CMDLINE:
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/* Build a commandline from the original argv. */
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{
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char **arg = ts->info->host_argv;
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int len = ARG(1);
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/* lock the buffer on the ARM side */
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char *cmdline_buffer = (char*)lock_user(ARG(0), len, 0);
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s = cmdline_buffer;
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while (*arg && len > 2) {
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int n = strlen(*arg);
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if (s != cmdline_buffer) {
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*(s++) = ' ';
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len--;
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}
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if (n >= len)
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n = len - 1;
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memcpy(s, *arg, n);
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s += n;
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len -= n;
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arg++;
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}
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/* Null terminate the string. */
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*s = 0;
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len = s - cmdline_buffer;
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/* Unlock the buffer on the ARM side. */
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unlock_user(cmdline_buffer, ARG(0), len);
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/* Adjust the commandline length argument. */
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SET_ARG(1, len);
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/* Return success if commandline fit into buffer. */
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return *arg ? -1 : 0;
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}
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case SYS_HEAPINFO:
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{
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uint32_t *ptr;
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uint32_t limit;
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/* Some C llibraries assume the heap immediately follows .bss, so
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allocate it using sbrk. */
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if (!ts->heap_limit) {
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long ret;
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ts->heap_base = do_brk(0);
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limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
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/* Try a big heap, and reduce the size if that fails. */
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for (;;) {
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ret = do_brk(limit);
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if (ret != -1)
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break;
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limit = (ts->heap_base >> 1) + (limit >> 1);
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}
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ts->heap_limit = limit;
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}
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page_unprotect_range (ARG(0), 32);
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ptr = (uint32_t *)g2h(ARG(0));
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ptr[0] = tswap32(ts->heap_base);
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ptr[1] = tswap32(ts->heap_limit);
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ptr[2] = tswap32(ts->stack_base);
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ptr[3] = tswap32(0); /* Stack limit. */
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return 0;
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}
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case SYS_EXIT:
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exit(0);
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default:
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fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
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cpu_dump_state(env, stderr, fprintf, 0);
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abort();
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}
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}
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