root / target-m68k / m68k-semi.c @ 9c17d615
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/*
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* m68k/ColdFire Semihosting syscall interface
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*
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* Copyright (c) 2005-2007 CodeSourcery.
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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, see <http://www.gnu.org/licenses/>.
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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 <errno.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 <sys/time.h> |
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#include <time.h> |
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#include "cpu.h" |
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#if defined(CONFIG_USER_ONLY)
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#include "qemu.h" |
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#define SEMIHOSTING_HEAP_SIZE (128 * 1024 * 1024) |
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#else
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#include "qemu-common.h" |
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#include "exec/gdbstub.h" |
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#include "exec/softmmu-semi.h" |
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#endif
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#include "sysemu/sysemu.h" |
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|
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#define HOSTED_EXIT 0 |
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#define HOSTED_INIT_SIM 1 |
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#define HOSTED_OPEN 2 |
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#define HOSTED_CLOSE 3 |
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#define HOSTED_READ 4 |
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#define HOSTED_WRITE 5 |
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#define HOSTED_LSEEK 6 |
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#define HOSTED_RENAME 7 |
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#define HOSTED_UNLINK 8 |
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#define HOSTED_STAT 9 |
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#define HOSTED_FSTAT 10 |
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#define HOSTED_GETTIMEOFDAY 11 |
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#define HOSTED_ISATTY 12 |
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#define HOSTED_SYSTEM 13 |
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|
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typedef uint32_t gdb_mode_t;
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typedef uint32_t gdb_time_t;
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|
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struct m68k_gdb_stat {
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uint32_t gdb_st_dev; /* device */
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uint32_t gdb_st_ino; /* inode */
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gdb_mode_t gdb_st_mode; /* protection */
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uint32_t gdb_st_nlink; /* number of hard links */
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uint32_t gdb_st_uid; /* user ID of owner */
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uint32_t gdb_st_gid; /* group ID of owner */
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uint32_t gdb_st_rdev; /* device type (if inode device) */
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uint64_t gdb_st_size; /* total size, in bytes */
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uint64_t gdb_st_blksize; /* blocksize for filesystem I/O */
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uint64_t gdb_st_blocks; /* number of blocks allocated */
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gdb_time_t gdb_st_atime; /* time of last access */
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gdb_time_t gdb_st_mtime; /* time of last modification */
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gdb_time_t gdb_st_ctime; /* time of last change */
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} QEMU_PACKED; |
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|
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struct gdb_timeval {
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gdb_time_t tv_sec; /* second */
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uint64_t tv_usec; /* microsecond */
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} QEMU_PACKED; |
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|
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#define GDB_O_RDONLY 0x0 |
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#define GDB_O_WRONLY 0x1 |
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#define GDB_O_RDWR 0x2 |
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#define GDB_O_APPEND 0x8 |
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#define GDB_O_CREAT 0x200 |
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#define GDB_O_TRUNC 0x400 |
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#define GDB_O_EXCL 0x800 |
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|
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static int translate_openflags(int flags) |
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{
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int hf;
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|
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if (flags & GDB_O_WRONLY)
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hf = O_WRONLY; |
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else if (flags & GDB_O_RDWR) |
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hf = O_RDWR; |
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else
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hf = O_RDONLY; |
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if (flags & GDB_O_APPEND) hf |= O_APPEND;
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if (flags & GDB_O_CREAT) hf |= O_CREAT;
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if (flags & GDB_O_TRUNC) hf |= O_TRUNC;
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if (flags & GDB_O_EXCL) hf |= O_EXCL;
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return hf;
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} |
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static void translate_stat(CPUM68KState *env, target_ulong addr, struct stat *s) |
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{
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struct m68k_gdb_stat *p;
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if (!(p = lock_user(VERIFY_WRITE, addr, sizeof(struct m68k_gdb_stat), 0))) |
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/* FIXME - should this return an error code? */
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return;
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p->gdb_st_dev = cpu_to_be32(s->st_dev); |
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p->gdb_st_ino = cpu_to_be32(s->st_ino); |
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p->gdb_st_mode = cpu_to_be32(s->st_mode); |
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p->gdb_st_nlink = cpu_to_be32(s->st_nlink); |
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p->gdb_st_uid = cpu_to_be32(s->st_uid); |
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p->gdb_st_gid = cpu_to_be32(s->st_gid); |
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p->gdb_st_rdev = cpu_to_be32(s->st_rdev); |
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p->gdb_st_size = cpu_to_be64(s->st_size); |
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#ifdef _WIN32
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/* Windows stat is missing some fields. */
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p->gdb_st_blksize = 0;
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p->gdb_st_blocks = 0;
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#else
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p->gdb_st_blksize = cpu_to_be64(s->st_blksize); |
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p->gdb_st_blocks = cpu_to_be64(s->st_blocks); |
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#endif
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p->gdb_st_atime = cpu_to_be32(s->st_atime); |
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p->gdb_st_mtime = cpu_to_be32(s->st_mtime); |
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p->gdb_st_ctime = cpu_to_be32(s->st_ctime); |
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unlock_user(p, addr, sizeof(struct m68k_gdb_stat)); |
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} |
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static void m68k_semi_return_u32(CPUM68KState *env, uint32_t ret, uint32_t err) |
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{
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target_ulong args = env->dregs[1];
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if (put_user_u32(ret, args) ||
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put_user_u32(err, args + 4)) {
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/* The m68k semihosting ABI does not provide any way to report this
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* error to the guest, so the best we can do is log it in qemu.
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* It is always a guest error not to pass us a valid argument block.
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*/
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qemu_log_mask(LOG_GUEST_ERROR, "m68k-semihosting: return value "
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"discarded because argument block not writable\n");
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} |
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} |
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static void m68k_semi_return_u64(CPUM68KState *env, uint64_t ret, uint32_t err) |
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{
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target_ulong args = env->dregs[1];
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if (put_user_u32(ret >> 32, args) || |
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put_user_u32(ret, args + 4) ||
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put_user_u32(err, args + 8)) {
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/* No way to report this via m68k semihosting ABI; just log it */
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qemu_log_mask(LOG_GUEST_ERROR, "m68k-semihosting: return value "
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"discarded because argument block not writable\n");
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} |
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} |
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static int m68k_semi_is_fseek; |
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static void m68k_semi_cb(CPUM68KState *env, target_ulong ret, target_ulong err) |
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{
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if (m68k_semi_is_fseek) {
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/* FIXME: We've already lost the high bits of the fseek
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return value. */
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m68k_semi_return_u64(env, ret, err); |
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m68k_semi_is_fseek = 0;
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} else {
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m68k_semi_return_u32(env, ret, err); |
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} |
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} |
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/* Read the input value from the argument block; fail the semihosting
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* call if the memory read fails.
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*/
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#define GET_ARG(n) do { \ |
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if (get_user_ual(arg ## n, args + (n) * 4)) { \ |
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result = -1; \
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errno = EFAULT; \ |
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goto failed; \
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} \ |
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} while (0) |
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void do_m68k_semihosting(CPUM68KState *env, int nr) |
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{
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uint32_t args; |
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target_ulong arg0, arg1, arg2, arg3; |
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void *p;
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void *q;
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uint32_t len; |
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uint32_t result; |
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args = env->dregs[1];
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switch (nr) {
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case HOSTED_EXIT:
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gdb_exit(env, env->dregs[0]);
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exit(env->dregs[0]);
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case HOSTED_OPEN:
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GET_ARG(0);
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GET_ARG(1);
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GET_ARG(2);
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GET_ARG(3);
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if (use_gdb_syscalls()) {
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gdb_do_syscall(m68k_semi_cb, "open,%s,%x,%x", arg0, (int)arg1, |
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arg2, arg3); |
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return;
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} else {
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p = lock_user_string(arg0); |
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if (!p) {
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/* FIXME - check error code? */
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result = -1;
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} else {
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result = open(p, translate_openflags(arg2), arg3); |
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unlock_user(p, arg0, 0);
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} |
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} |
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break;
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case HOSTED_CLOSE:
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{
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/* Ignore attempts to close stdin/out/err. */
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GET_ARG(0);
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int fd = arg0;
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if (fd > 2) { |
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if (use_gdb_syscalls()) {
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gdb_do_syscall(m68k_semi_cb, "close,%x", arg0);
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return;
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} else {
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result = close(fd); |
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} |
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} else {
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result = 0;
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} |
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break;
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} |
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case HOSTED_READ:
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GET_ARG(0);
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GET_ARG(1);
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GET_ARG(2);
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len = arg2; |
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if (use_gdb_syscalls()) {
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gdb_do_syscall(m68k_semi_cb, "read,%x,%x,%x",
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arg0, arg1, len); |
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return;
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} else {
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p = lock_user(VERIFY_WRITE, arg1, len, 0);
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if (!p) {
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/* FIXME - check error code? */
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result = -1;
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} else {
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result = read(arg0, p, len); |
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unlock_user(p, arg1, len); |
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} |
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} |
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break;
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case HOSTED_WRITE:
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GET_ARG(0);
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GET_ARG(1);
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GET_ARG(2);
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len = arg2; |
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if (use_gdb_syscalls()) {
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gdb_do_syscall(m68k_semi_cb, "write,%x,%x,%x",
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arg0, arg1, len); |
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return;
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} else {
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p = lock_user(VERIFY_READ, arg1, len, 1);
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if (!p) {
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/* FIXME - check error code? */
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result = -1;
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} else {
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result = write(arg0, p, len); |
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unlock_user(p, arg0, 0);
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} |
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} |
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break;
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case HOSTED_LSEEK:
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{
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uint64_t off; |
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GET_ARG(0);
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GET_ARG(1);
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GET_ARG(2);
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GET_ARG(3);
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off = (uint32_t)arg2 | ((uint64_t)arg1 << 32);
|
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if (use_gdb_syscalls()) {
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m68k_semi_is_fseek = 1;
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gdb_do_syscall(m68k_semi_cb, "fseek,%x,%lx,%x",
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arg0, off, arg3); |
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} else {
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off = lseek(arg0, off, arg3); |
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m68k_semi_return_u64(env, off, errno); |
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} |
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return;
|
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} |
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case HOSTED_RENAME:
|
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GET_ARG(0);
|
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GET_ARG(1);
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GET_ARG(2);
|
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GET_ARG(3);
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if (use_gdb_syscalls()) {
|
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gdb_do_syscall(m68k_semi_cb, "rename,%s,%s",
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arg0, (int)arg1, arg2, (int)arg3); |
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return;
|
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} else {
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p = lock_user_string(arg0); |
| 307 |
q = lock_user_string(arg2); |
| 308 |
if (!p || !q) {
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/* FIXME - check error code? */
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result = -1;
|
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} else {
|
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result = rename(p, q); |
| 313 |
} |
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unlock_user(p, arg0, 0);
|
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unlock_user(q, arg2, 0);
|
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} |
| 317 |
break;
|
| 318 |
case HOSTED_UNLINK:
|
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GET_ARG(0);
|
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GET_ARG(1);
|
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if (use_gdb_syscalls()) {
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gdb_do_syscall(m68k_semi_cb, "unlink,%s",
|
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arg0, (int)arg1);
|
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return;
|
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} else {
|
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p = lock_user_string(arg0); |
| 327 |
if (!p) {
|
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/* FIXME - check error code? */
|
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result = -1;
|
| 330 |
} else {
|
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result = unlink(p); |
| 332 |
unlock_user(p, arg0, 0);
|
| 333 |
} |
| 334 |
} |
| 335 |
break;
|
| 336 |
case HOSTED_STAT:
|
| 337 |
GET_ARG(0);
|
| 338 |
GET_ARG(1);
|
| 339 |
GET_ARG(2);
|
| 340 |
if (use_gdb_syscalls()) {
|
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gdb_do_syscall(m68k_semi_cb, "stat,%s,%x",
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arg0, (int)arg1, arg2);
|
| 343 |
return;
|
| 344 |
} else {
|
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struct stat s;
|
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p = lock_user_string(arg0); |
| 347 |
if (!p) {
|
| 348 |
/* FIXME - check error code? */
|
| 349 |
result = -1;
|
| 350 |
} else {
|
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result = stat(p, &s); |
| 352 |
unlock_user(p, arg0, 0);
|
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} |
| 354 |
if (result == 0) { |
| 355 |
translate_stat(env, arg2, &s); |
| 356 |
} |
| 357 |
} |
| 358 |
break;
|
| 359 |
case HOSTED_FSTAT:
|
| 360 |
GET_ARG(0);
|
| 361 |
GET_ARG(1);
|
| 362 |
if (use_gdb_syscalls()) {
|
| 363 |
gdb_do_syscall(m68k_semi_cb, "fstat,%x,%x",
|
| 364 |
arg0, arg1); |
| 365 |
return;
|
| 366 |
} else {
|
| 367 |
struct stat s;
|
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result = fstat(arg0, &s); |
| 369 |
if (result == 0) { |
| 370 |
translate_stat(env, arg1, &s); |
| 371 |
} |
| 372 |
} |
| 373 |
break;
|
| 374 |
case HOSTED_GETTIMEOFDAY:
|
| 375 |
GET_ARG(0);
|
| 376 |
GET_ARG(1);
|
| 377 |
if (use_gdb_syscalls()) {
|
| 378 |
gdb_do_syscall(m68k_semi_cb, "gettimeofday,%x,%x",
|
| 379 |
arg0, arg1); |
| 380 |
return;
|
| 381 |
} else {
|
| 382 |
qemu_timeval tv; |
| 383 |
struct gdb_timeval *p;
|
| 384 |
result = qemu_gettimeofday(&tv); |
| 385 |
if (result != 0) { |
| 386 |
if (!(p = lock_user(VERIFY_WRITE,
|
| 387 |
arg0, sizeof(struct gdb_timeval), 0))) { |
| 388 |
/* FIXME - check error code? */
|
| 389 |
result = -1;
|
| 390 |
} else {
|
| 391 |
p->tv_sec = cpu_to_be32(tv.tv_sec); |
| 392 |
p->tv_usec = cpu_to_be64(tv.tv_usec); |
| 393 |
unlock_user(p, arg0, sizeof(struct gdb_timeval)); |
| 394 |
} |
| 395 |
} |
| 396 |
} |
| 397 |
break;
|
| 398 |
case HOSTED_ISATTY:
|
| 399 |
GET_ARG(0);
|
| 400 |
if (use_gdb_syscalls()) {
|
| 401 |
gdb_do_syscall(m68k_semi_cb, "isatty,%x", arg0);
|
| 402 |
return;
|
| 403 |
} else {
|
| 404 |
result = isatty(arg0); |
| 405 |
} |
| 406 |
break;
|
| 407 |
case HOSTED_SYSTEM:
|
| 408 |
GET_ARG(0);
|
| 409 |
GET_ARG(1);
|
| 410 |
if (use_gdb_syscalls()) {
|
| 411 |
gdb_do_syscall(m68k_semi_cb, "system,%s",
|
| 412 |
arg0, (int)arg1);
|
| 413 |
return;
|
| 414 |
} else {
|
| 415 |
p = lock_user_string(arg0); |
| 416 |
if (!p) {
|
| 417 |
/* FIXME - check error code? */
|
| 418 |
result = -1;
|
| 419 |
} else {
|
| 420 |
result = system(p); |
| 421 |
unlock_user(p, arg0, 0);
|
| 422 |
} |
| 423 |
} |
| 424 |
break;
|
| 425 |
case HOSTED_INIT_SIM:
|
| 426 |
#if defined(CONFIG_USER_ONLY)
|
| 427 |
{
|
| 428 |
TaskState *ts = env->opaque; |
| 429 |
/* Allocate the heap using sbrk. */
|
| 430 |
if (!ts->heap_limit) {
|
| 431 |
abi_ulong ret; |
| 432 |
uint32_t size; |
| 433 |
uint32_t base; |
| 434 |
|
| 435 |
base = do_brk(0);
|
| 436 |
size = SEMIHOSTING_HEAP_SIZE; |
| 437 |
/* Try a big heap, and reduce the size if that fails. */
|
| 438 |
for (;;) {
|
| 439 |
ret = do_brk(base + size); |
| 440 |
if (ret >= (base + size)) {
|
| 441 |
break;
|
| 442 |
} |
| 443 |
size >>= 1;
|
| 444 |
} |
| 445 |
ts->heap_limit = base + size; |
| 446 |
} |
| 447 |
/* This call may happen before we have writable memory, so return
|
| 448 |
values directly in registers. */
|
| 449 |
env->dregs[1] = ts->heap_limit;
|
| 450 |
env->aregs[7] = ts->stack_base;
|
| 451 |
} |
| 452 |
#else
|
| 453 |
/* FIXME: This is wrong for boards where RAM does not start at
|
| 454 |
address zero. */
|
| 455 |
env->dregs[1] = ram_size;
|
| 456 |
env->aregs[7] = ram_size;
|
| 457 |
#endif
|
| 458 |
return;
|
| 459 |
default:
|
| 460 |
cpu_abort(env, "Unsupported semihosting syscall %d\n", nr);
|
| 461 |
result = 0;
|
| 462 |
} |
| 463 |
failed:
|
| 464 |
m68k_semi_return_u32(env, result, errno); |
| 465 |
} |