| /* |
| * Syscall implementations for semihosting. |
| * |
| * Copyright (c) 2022 Linaro |
| * |
| * SPDX-License-Identifier: GPL-2.0-or-later |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "exec/gdbstub.h" |
| #include "semihosting/guestfd.h" |
| #include "semihosting/syscalls.h" |
| #include "semihosting/console.h" |
| #ifdef CONFIG_USER_ONLY |
| #include "qemu.h" |
| #else |
| #include "semihosting/softmmu-uaccess.h" |
| #endif |
| |
| |
| /* |
| * Validate or compute the length of the string (including terminator). |
| */ |
| static int validate_strlen(CPUState *cs, target_ulong str, target_ulong tlen) |
| { |
| CPUArchState *env G_GNUC_UNUSED = cs->env_ptr; |
| char c; |
| |
| if (tlen == 0) { |
| ssize_t slen = target_strlen(str); |
| |
| if (slen < 0) { |
| return -EFAULT; |
| } |
| if (slen >= INT32_MAX) { |
| return -ENAMETOOLONG; |
| } |
| return slen + 1; |
| } |
| if (tlen > INT32_MAX) { |
| return -ENAMETOOLONG; |
| } |
| if (get_user_u8(c, str + tlen - 1)) { |
| return -EFAULT; |
| } |
| if (c != 0) { |
| return -EINVAL; |
| } |
| return tlen; |
| } |
| |
| static int validate_lock_user_string(char **pstr, CPUState *cs, |
| target_ulong tstr, target_ulong tlen) |
| { |
| int ret = validate_strlen(cs, tstr, tlen); |
| CPUArchState *env G_GNUC_UNUSED = cs->env_ptr; |
| char *str = NULL; |
| |
| if (ret > 0) { |
| str = lock_user(VERIFY_READ, tstr, ret, true); |
| ret = str ? 0 : -EFAULT; |
| } |
| *pstr = str; |
| return ret; |
| } |
| |
| /* |
| * TODO: Note that gdb always stores the stat structure big-endian. |
| * So far, that's ok, as the only two targets using this are also |
| * big-endian. Until we do something with gdb, also produce the |
| * same big-endian result from the host. |
| */ |
| static int copy_stat_to_user(CPUState *cs, target_ulong addr, |
| const struct stat *s) |
| { |
| CPUArchState *env G_GNUC_UNUSED = cs->env_ptr; |
| struct gdb_stat *p; |
| |
| if (s->st_dev != (uint32_t)s->st_dev || |
| s->st_ino != (uint32_t)s->st_ino) { |
| return -EOVERFLOW; |
| } |
| |
| p = lock_user(VERIFY_WRITE, addr, sizeof(struct gdb_stat), 0); |
| if (!p) { |
| return -EFAULT; |
| } |
| |
| p->gdb_st_dev = cpu_to_be32(s->st_dev); |
| p->gdb_st_ino = cpu_to_be32(s->st_ino); |
| p->gdb_st_mode = cpu_to_be32(s->st_mode); |
| p->gdb_st_nlink = cpu_to_be32(s->st_nlink); |
| p->gdb_st_uid = cpu_to_be32(s->st_uid); |
| p->gdb_st_gid = cpu_to_be32(s->st_gid); |
| p->gdb_st_rdev = cpu_to_be32(s->st_rdev); |
| p->gdb_st_size = cpu_to_be64(s->st_size); |
| #ifdef _WIN32 |
| /* Windows stat is missing some fields. */ |
| p->gdb_st_blksize = 0; |
| p->gdb_st_blocks = 0; |
| #else |
| p->gdb_st_blksize = cpu_to_be64(s->st_blksize); |
| p->gdb_st_blocks = cpu_to_be64(s->st_blocks); |
| #endif |
| p->gdb_st_atime = cpu_to_be32(s->st_atime); |
| p->gdb_st_mtime = cpu_to_be32(s->st_mtime); |
| p->gdb_st_ctime = cpu_to_be32(s->st_ctime); |
| |
| unlock_user(p, addr, sizeof(struct gdb_stat)); |
| return 0; |
| } |
| |
| /* |
| * GDB semihosting syscall implementations. |
| */ |
| |
| static gdb_syscall_complete_cb gdb_open_complete; |
| |
| static void gdb_open_cb(CPUState *cs, uint64_t ret, int err) |
| { |
| if (!err) { |
| int guestfd = alloc_guestfd(); |
| associate_guestfd(guestfd, ret); |
| ret = guestfd; |
| } |
| gdb_open_complete(cs, ret, err); |
| } |
| |
| static void gdb_open(CPUState *cs, gdb_syscall_complete_cb complete, |
| target_ulong fname, target_ulong fname_len, |
| int gdb_flags, int mode) |
| { |
| int len = validate_strlen(cs, fname, fname_len); |
| if (len < 0) { |
| complete(cs, -1, -len); |
| return; |
| } |
| |
| gdb_open_complete = complete; |
| gdb_do_syscall(gdb_open_cb, "open,%s,%x,%x", |
| fname, len, (target_ulong)gdb_flags, (target_ulong)mode); |
| } |
| |
| static void gdb_close(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf) |
| { |
| gdb_do_syscall(complete, "close,%x", (target_ulong)gf->hostfd); |
| } |
| |
| static void gdb_read(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf, target_ulong buf, target_ulong len) |
| { |
| gdb_do_syscall(complete, "read,%x,%x,%x", |
| (target_ulong)gf->hostfd, buf, len); |
| } |
| |
| static void gdb_write(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf, target_ulong buf, target_ulong len) |
| { |
| gdb_do_syscall(complete, "write,%x,%x,%x", |
| (target_ulong)gf->hostfd, buf, len); |
| } |
| |
| static void gdb_lseek(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf, int64_t off, int gdb_whence) |
| { |
| gdb_do_syscall(complete, "lseek,%x,%lx,%x", |
| (target_ulong)gf->hostfd, off, (target_ulong)gdb_whence); |
| } |
| |
| static void gdb_isatty(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf) |
| { |
| gdb_do_syscall(complete, "isatty,%x", (target_ulong)gf->hostfd); |
| } |
| |
| static void gdb_fstat(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf, target_ulong addr) |
| { |
| gdb_do_syscall(complete, "fstat,%x,%x", (target_ulong)gf->hostfd, addr); |
| } |
| |
| static void gdb_stat(CPUState *cs, gdb_syscall_complete_cb complete, |
| target_ulong fname, target_ulong fname_len, |
| target_ulong addr) |
| { |
| int len = validate_strlen(cs, fname, fname_len); |
| if (len < 0) { |
| complete(cs, -1, -len); |
| return; |
| } |
| |
| gdb_do_syscall(complete, "stat,%s,%x", fname, len, addr); |
| } |
| |
| static void gdb_remove(CPUState *cs, gdb_syscall_complete_cb complete, |
| target_ulong fname, target_ulong fname_len) |
| { |
| int len = validate_strlen(cs, fname, fname_len); |
| if (len < 0) { |
| complete(cs, -1, -len); |
| return; |
| } |
| |
| gdb_do_syscall(complete, "unlink,%s", fname, len); |
| } |
| |
| static void gdb_rename(CPUState *cs, gdb_syscall_complete_cb complete, |
| target_ulong oname, target_ulong oname_len, |
| target_ulong nname, target_ulong nname_len) |
| { |
| int olen, nlen; |
| |
| olen = validate_strlen(cs, oname, oname_len); |
| if (olen < 0) { |
| complete(cs, -1, -olen); |
| return; |
| } |
| nlen = validate_strlen(cs, nname, nname_len); |
| if (nlen < 0) { |
| complete(cs, -1, -nlen); |
| return; |
| } |
| |
| gdb_do_syscall(complete, "rename,%s,%s", oname, olen, nname, nlen); |
| } |
| |
| static void gdb_system(CPUState *cs, gdb_syscall_complete_cb complete, |
| target_ulong cmd, target_ulong cmd_len) |
| { |
| int len = validate_strlen(cs, cmd, cmd_len); |
| if (len < 0) { |
| complete(cs, -1, -len); |
| return; |
| } |
| |
| gdb_do_syscall(complete, "system,%s", cmd, len); |
| } |
| |
| static void gdb_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete, |
| target_ulong tv_addr, target_ulong tz_addr) |
| { |
| gdb_do_syscall(complete, "gettimeofday,%x,%x", tv_addr, tz_addr); |
| } |
| |
| /* |
| * Host semihosting syscall implementations. |
| */ |
| |
| static void host_open(CPUState *cs, gdb_syscall_complete_cb complete, |
| target_ulong fname, target_ulong fname_len, |
| int gdb_flags, int mode) |
| { |
| CPUArchState *env G_GNUC_UNUSED = cs->env_ptr; |
| char *p; |
| int ret, host_flags; |
| |
| ret = validate_lock_user_string(&p, cs, fname, fname_len); |
| if (ret < 0) { |
| complete(cs, -1, -ret); |
| return; |
| } |
| |
| if (gdb_flags & GDB_O_WRONLY) { |
| host_flags = O_WRONLY; |
| } else if (gdb_flags & GDB_O_RDWR) { |
| host_flags = O_RDWR; |
| } else { |
| host_flags = O_RDONLY; |
| } |
| if (gdb_flags & GDB_O_CREAT) { |
| host_flags |= O_CREAT; |
| } |
| if (gdb_flags & GDB_O_TRUNC) { |
| host_flags |= O_TRUNC; |
| } |
| if (gdb_flags & GDB_O_EXCL) { |
| host_flags |= O_EXCL; |
| } |
| |
| ret = open(p, host_flags, mode); |
| if (ret < 0) { |
| complete(cs, -1, errno); |
| } else { |
| int guestfd = alloc_guestfd(); |
| associate_guestfd(guestfd, ret); |
| complete(cs, guestfd, 0); |
| } |
| unlock_user(p, fname, 0); |
| } |
| |
| static void host_close(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf) |
| { |
| /* |
| * Only close the underlying host fd if it's one we opened on behalf |
| * of the guest in SYS_OPEN. |
| */ |
| if (gf->hostfd != STDIN_FILENO && |
| gf->hostfd != STDOUT_FILENO && |
| gf->hostfd != STDERR_FILENO && |
| close(gf->hostfd) < 0) { |
| complete(cs, -1, errno); |
| } else { |
| complete(cs, 0, 0); |
| } |
| } |
| |
| static void host_read(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf, target_ulong buf, target_ulong len) |
| { |
| CPUArchState *env G_GNUC_UNUSED = cs->env_ptr; |
| void *ptr = lock_user(VERIFY_WRITE, buf, len, 0); |
| ssize_t ret; |
| |
| if (!ptr) { |
| complete(cs, -1, EFAULT); |
| return; |
| } |
| ret = RETRY_ON_EINTR(read(gf->hostfd, ptr, len)); |
| if (ret == -1) { |
| complete(cs, -1, errno); |
| unlock_user(ptr, buf, 0); |
| } else { |
| complete(cs, ret, 0); |
| unlock_user(ptr, buf, ret); |
| } |
| } |
| |
| static void host_write(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf, target_ulong buf, target_ulong len) |
| { |
| CPUArchState *env G_GNUC_UNUSED = cs->env_ptr; |
| void *ptr = lock_user(VERIFY_READ, buf, len, 1); |
| ssize_t ret; |
| |
| if (!ptr) { |
| complete(cs, -1, EFAULT); |
| return; |
| } |
| ret = write(gf->hostfd, ptr, len); |
| complete(cs, ret, ret == -1 ? errno : 0); |
| unlock_user(ptr, buf, 0); |
| } |
| |
| static void host_lseek(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf, int64_t off, int whence) |
| { |
| /* So far, all hosts use the same values. */ |
| QEMU_BUILD_BUG_ON(GDB_SEEK_SET != SEEK_SET); |
| QEMU_BUILD_BUG_ON(GDB_SEEK_CUR != SEEK_CUR); |
| QEMU_BUILD_BUG_ON(GDB_SEEK_END != SEEK_END); |
| |
| off_t ret = off; |
| int err = 0; |
| |
| if (ret == off) { |
| ret = lseek(gf->hostfd, ret, whence); |
| if (ret == -1) { |
| err = errno; |
| } |
| } else { |
| ret = -1; |
| err = EINVAL; |
| } |
| complete(cs, ret, err); |
| } |
| |
| static void host_isatty(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf) |
| { |
| int ret = isatty(gf->hostfd); |
| complete(cs, ret, ret ? 0 : errno); |
| } |
| |
| static void host_flen(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf) |
| { |
| struct stat buf; |
| |
| if (fstat(gf->hostfd, &buf) < 0) { |
| complete(cs, -1, errno); |
| } else { |
| complete(cs, buf.st_size, 0); |
| } |
| } |
| |
| static void host_fstat(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf, target_ulong addr) |
| { |
| struct stat buf; |
| int ret; |
| |
| ret = fstat(gf->hostfd, &buf); |
| if (ret) { |
| complete(cs, -1, errno); |
| return; |
| } |
| ret = copy_stat_to_user(cs, addr, &buf); |
| complete(cs, ret ? -1 : 0, ret ? -ret : 0); |
| } |
| |
| static void host_stat(CPUState *cs, gdb_syscall_complete_cb complete, |
| target_ulong fname, target_ulong fname_len, |
| target_ulong addr) |
| { |
| CPUArchState *env G_GNUC_UNUSED = cs->env_ptr; |
| struct stat buf; |
| char *name; |
| int ret, err; |
| |
| ret = validate_lock_user_string(&name, cs, fname, fname_len); |
| if (ret < 0) { |
| complete(cs, -1, -ret); |
| return; |
| } |
| |
| ret = stat(name, &buf); |
| if (ret) { |
| err = errno; |
| } else { |
| ret = copy_stat_to_user(cs, addr, &buf); |
| err = 0; |
| if (ret < 0) { |
| err = -ret; |
| ret = -1; |
| } |
| } |
| complete(cs, ret, err); |
| unlock_user(name, fname, 0); |
| } |
| |
| static void host_remove(CPUState *cs, gdb_syscall_complete_cb complete, |
| target_ulong fname, target_ulong fname_len) |
| { |
| CPUArchState *env G_GNUC_UNUSED = cs->env_ptr; |
| char *p; |
| int ret; |
| |
| ret = validate_lock_user_string(&p, cs, fname, fname_len); |
| if (ret < 0) { |
| complete(cs, -1, -ret); |
| return; |
| } |
| |
| ret = remove(p); |
| complete(cs, ret, ret ? errno : 0); |
| unlock_user(p, fname, 0); |
| } |
| |
| static void host_rename(CPUState *cs, gdb_syscall_complete_cb complete, |
| target_ulong oname, target_ulong oname_len, |
| target_ulong nname, target_ulong nname_len) |
| { |
| CPUArchState *env G_GNUC_UNUSED = cs->env_ptr; |
| char *ostr, *nstr; |
| int ret; |
| |
| ret = validate_lock_user_string(&ostr, cs, oname, oname_len); |
| if (ret < 0) { |
| complete(cs, -1, -ret); |
| return; |
| } |
| ret = validate_lock_user_string(&nstr, cs, nname, nname_len); |
| if (ret < 0) { |
| unlock_user(ostr, oname, 0); |
| complete(cs, -1, -ret); |
| return; |
| } |
| |
| ret = rename(ostr, nstr); |
| complete(cs, ret, ret ? errno : 0); |
| unlock_user(ostr, oname, 0); |
| unlock_user(nstr, nname, 0); |
| } |
| |
| static void host_system(CPUState *cs, gdb_syscall_complete_cb complete, |
| target_ulong cmd, target_ulong cmd_len) |
| { |
| CPUArchState *env G_GNUC_UNUSED = cs->env_ptr; |
| char *p; |
| int ret; |
| |
| ret = validate_lock_user_string(&p, cs, cmd, cmd_len); |
| if (ret < 0) { |
| complete(cs, -1, -ret); |
| return; |
| } |
| |
| ret = system(p); |
| complete(cs, ret, ret == -1 ? errno : 0); |
| unlock_user(p, cmd, 0); |
| } |
| |
| static void host_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete, |
| target_ulong tv_addr, target_ulong tz_addr) |
| { |
| CPUArchState *env G_GNUC_UNUSED = cs->env_ptr; |
| struct gdb_timeval *p; |
| int64_t rt; |
| |
| /* GDB fails on non-null TZ, so be consistent. */ |
| if (tz_addr != 0) { |
| complete(cs, -1, EINVAL); |
| return; |
| } |
| |
| p = lock_user(VERIFY_WRITE, tv_addr, sizeof(struct gdb_timeval), 0); |
| if (!p) { |
| complete(cs, -1, EFAULT); |
| return; |
| } |
| |
| /* TODO: Like stat, gdb always produces big-endian results; match it. */ |
| rt = g_get_real_time(); |
| p->tv_sec = cpu_to_be32(rt / G_USEC_PER_SEC); |
| p->tv_usec = cpu_to_be64(rt % G_USEC_PER_SEC); |
| unlock_user(p, tv_addr, sizeof(struct gdb_timeval)); |
| } |
| |
| #ifndef CONFIG_USER_ONLY |
| static void host_poll_one(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf, GIOCondition cond, int timeout) |
| { |
| /* |
| * Since this is only used by xtensa in system mode, and stdio is |
| * handled through GuestFDConsole, and there are no semihosting |
| * system calls for sockets and the like, that means this descriptor |
| * must be a normal file. Normal files never block and are thus |
| * always ready. |
| */ |
| complete(cs, cond & (G_IO_IN | G_IO_OUT), 0); |
| } |
| #endif |
| |
| /* |
| * Static file semihosting syscall implementations. |
| */ |
| |
| static void staticfile_read(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf, target_ulong buf, target_ulong len) |
| { |
| CPUArchState *env G_GNUC_UNUSED = cs->env_ptr; |
| target_ulong rest = gf->staticfile.len - gf->staticfile.off; |
| void *ptr; |
| |
| if (len > rest) { |
| len = rest; |
| } |
| ptr = lock_user(VERIFY_WRITE, buf, len, 0); |
| if (!ptr) { |
| complete(cs, -1, EFAULT); |
| return; |
| } |
| memcpy(ptr, gf->staticfile.data + gf->staticfile.off, len); |
| gf->staticfile.off += len; |
| complete(cs, len, 0); |
| unlock_user(ptr, buf, len); |
| } |
| |
| static void staticfile_lseek(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf, int64_t off, int gdb_whence) |
| { |
| int64_t ret; |
| |
| switch (gdb_whence) { |
| case GDB_SEEK_SET: |
| ret = off; |
| break; |
| case GDB_SEEK_CUR: |
| ret = gf->staticfile.off + off; |
| break; |
| case GDB_SEEK_END: |
| ret = gf->staticfile.len + off; |
| break; |
| default: |
| ret = -1; |
| break; |
| } |
| if (ret >= 0 && ret <= gf->staticfile.len) { |
| gf->staticfile.off = ret; |
| complete(cs, ret, 0); |
| } else { |
| complete(cs, -1, EINVAL); |
| } |
| } |
| |
| static void staticfile_flen(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf) |
| { |
| complete(cs, gf->staticfile.len, 0); |
| } |
| |
| /* |
| * Console semihosting syscall implementations. |
| */ |
| |
| static void console_read(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf, target_ulong buf, target_ulong len) |
| { |
| CPUArchState *env G_GNUC_UNUSED = cs->env_ptr; |
| char *ptr; |
| int ret; |
| |
| ptr = lock_user(VERIFY_WRITE, buf, len, 0); |
| if (!ptr) { |
| complete(cs, -1, EFAULT); |
| return; |
| } |
| ret = qemu_semihosting_console_read(cs, ptr, len); |
| complete(cs, ret, 0); |
| unlock_user(ptr, buf, ret); |
| } |
| |
| static void console_write(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf, target_ulong buf, target_ulong len) |
| { |
| CPUArchState *env G_GNUC_UNUSED = cs->env_ptr; |
| char *ptr = lock_user(VERIFY_READ, buf, len, 1); |
| int ret; |
| |
| if (!ptr) { |
| complete(cs, -1, EFAULT); |
| return; |
| } |
| ret = qemu_semihosting_console_write(ptr, len); |
| complete(cs, ret ? ret : -1, ret ? 0 : EIO); |
| unlock_user(ptr, buf, 0); |
| } |
| |
| static void console_fstat(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf, target_ulong addr) |
| { |
| static const struct stat tty_buf = { |
| .st_mode = 020666, /* S_IFCHR, ugo+rw */ |
| .st_rdev = 5, /* makedev(5, 0) -- linux /dev/tty */ |
| }; |
| int ret; |
| |
| ret = copy_stat_to_user(cs, addr, &tty_buf); |
| complete(cs, ret ? -1 : 0, ret ? -ret : 0); |
| } |
| |
| #ifndef CONFIG_USER_ONLY |
| static void console_poll_one(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf, GIOCondition cond, int timeout) |
| { |
| /* The semihosting console does not support urgent data or errors. */ |
| cond &= G_IO_IN | G_IO_OUT; |
| |
| /* |
| * Since qemu_semihosting_console_write never blocks, we can |
| * consider output always ready -- leave G_IO_OUT alone. |
| * All that remains is to conditionally signal input ready. |
| * Since output ready causes an immediate return, only block |
| * for G_IO_IN alone. |
| * |
| * TODO: Implement proper timeout. For now, only support |
| * indefinite wait or immediate poll. |
| */ |
| if (cond == G_IO_IN && timeout < 0) { |
| qemu_semihosting_console_block_until_ready(cs); |
| /* We returned -- input must be ready. */ |
| } else if ((cond & G_IO_IN) && !qemu_semihosting_console_ready()) { |
| cond &= ~G_IO_IN; |
| } |
| |
| complete(cs, cond, 0); |
| } |
| #endif |
| |
| /* |
| * Syscall entry points. |
| */ |
| |
| void semihost_sys_open(CPUState *cs, gdb_syscall_complete_cb complete, |
| target_ulong fname, target_ulong fname_len, |
| int gdb_flags, int mode) |
| { |
| if (use_gdb_syscalls()) { |
| gdb_open(cs, complete, fname, fname_len, gdb_flags, mode); |
| } else { |
| host_open(cs, complete, fname, fname_len, gdb_flags, mode); |
| } |
| } |
| |
| void semihost_sys_close(CPUState *cs, gdb_syscall_complete_cb complete, int fd) |
| { |
| GuestFD *gf = get_guestfd(fd); |
| |
| if (!gf) { |
| complete(cs, -1, EBADF); |
| return; |
| } |
| switch (gf->type) { |
| case GuestFDGDB: |
| gdb_close(cs, complete, gf); |
| break; |
| case GuestFDHost: |
| host_close(cs, complete, gf); |
| break; |
| case GuestFDStatic: |
| case GuestFDConsole: |
| complete(cs, 0, 0); |
| break; |
| default: |
| g_assert_not_reached(); |
| } |
| dealloc_guestfd(fd); |
| } |
| |
| void semihost_sys_read_gf(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf, target_ulong buf, target_ulong len) |
| { |
| /* |
| * Bound length for 64-bit guests on 32-bit hosts, not overlowing ssize_t. |
| * Note the Linux kernel does this with MAX_RW_COUNT, so it's not a bad |
| * idea to do this unconditionally. |
| */ |
| if (len > INT32_MAX) { |
| len = INT32_MAX; |
| } |
| switch (gf->type) { |
| case GuestFDGDB: |
| gdb_read(cs, complete, gf, buf, len); |
| break; |
| case GuestFDHost: |
| host_read(cs, complete, gf, buf, len); |
| break; |
| case GuestFDStatic: |
| staticfile_read(cs, complete, gf, buf, len); |
| break; |
| case GuestFDConsole: |
| console_read(cs, complete, gf, buf, len); |
| break; |
| default: |
| g_assert_not_reached(); |
| } |
| } |
| |
| void semihost_sys_read(CPUState *cs, gdb_syscall_complete_cb complete, |
| int fd, target_ulong buf, target_ulong len) |
| { |
| GuestFD *gf = get_guestfd(fd); |
| |
| if (gf) { |
| semihost_sys_read_gf(cs, complete, gf, buf, len); |
| } else { |
| complete(cs, -1, EBADF); |
| } |
| } |
| |
| void semihost_sys_write_gf(CPUState *cs, gdb_syscall_complete_cb complete, |
| GuestFD *gf, target_ulong buf, target_ulong len) |
| { |
| /* |
| * Bound length for 64-bit guests on 32-bit hosts, not overlowing ssize_t. |
| * Note the Linux kernel does this with MAX_RW_COUNT, so it's not a bad |
| * idea to do this unconditionally. |
| */ |
| if (len > INT32_MAX) { |
| len = INT32_MAX; |
| } |
| switch (gf->type) { |
| case GuestFDGDB: |
| gdb_write(cs, complete, gf, buf, len); |
| break; |
| case GuestFDHost: |
| host_write(cs, complete, gf, buf, len); |
| break; |
| case GuestFDConsole: |
| console_write(cs, complete, gf, buf, len); |
| break; |
| case GuestFDStatic: |
| /* Static files are never open for writing: EBADF. */ |
| complete(cs, -1, EBADF); |
| break; |
| default: |
| g_assert_not_reached(); |
| } |
| } |
| |
| void semihost_sys_write(CPUState *cs, gdb_syscall_complete_cb complete, |
| int fd, target_ulong buf, target_ulong len) |
| { |
| GuestFD *gf = get_guestfd(fd); |
| |
| if (gf) { |
| semihost_sys_write_gf(cs, complete, gf, buf, len); |
| } else { |
| complete(cs, -1, EBADF); |
| } |
| } |
| |
| void semihost_sys_lseek(CPUState *cs, gdb_syscall_complete_cb complete, |
| int fd, int64_t off, int gdb_whence) |
| { |
| GuestFD *gf = get_guestfd(fd); |
| |
| if (!gf) { |
| complete(cs, -1, EBADF); |
| return; |
| } |
| switch (gf->type) { |
| case GuestFDGDB: |
| gdb_lseek(cs, complete, gf, off, gdb_whence); |
| return; |
| case GuestFDHost: |
| host_lseek(cs, complete, gf, off, gdb_whence); |
| break; |
| case GuestFDStatic: |
| staticfile_lseek(cs, complete, gf, off, gdb_whence); |
| break; |
| case GuestFDConsole: |
| complete(cs, -1, ESPIPE); |
| break; |
| default: |
| g_assert_not_reached(); |
| } |
| } |
| |
| void semihost_sys_isatty(CPUState *cs, gdb_syscall_complete_cb complete, int fd) |
| { |
| GuestFD *gf = get_guestfd(fd); |
| |
| if (!gf) { |
| complete(cs, 0, EBADF); |
| return; |
| } |
| switch (gf->type) { |
| case GuestFDGDB: |
| gdb_isatty(cs, complete, gf); |
| break; |
| case GuestFDHost: |
| host_isatty(cs, complete, gf); |
| break; |
| case GuestFDStatic: |
| complete(cs, 0, ENOTTY); |
| break; |
| case GuestFDConsole: |
| complete(cs, 1, 0); |
| break; |
| default: |
| g_assert_not_reached(); |
| } |
| } |
| |
| void semihost_sys_flen(CPUState *cs, gdb_syscall_complete_cb fstat_cb, |
| gdb_syscall_complete_cb flen_cb, int fd, |
| target_ulong fstat_addr) |
| { |
| GuestFD *gf = get_guestfd(fd); |
| |
| if (!gf) { |
| flen_cb(cs, -1, EBADF); |
| return; |
| } |
| switch (gf->type) { |
| case GuestFDGDB: |
| gdb_fstat(cs, fstat_cb, gf, fstat_addr); |
| break; |
| case GuestFDHost: |
| host_flen(cs, flen_cb, gf); |
| break; |
| case GuestFDStatic: |
| staticfile_flen(cs, flen_cb, gf); |
| break; |
| case GuestFDConsole: |
| default: |
| g_assert_not_reached(); |
| } |
| } |
| |
| void semihost_sys_fstat(CPUState *cs, gdb_syscall_complete_cb complete, |
| int fd, target_ulong addr) |
| { |
| GuestFD *gf = get_guestfd(fd); |
| |
| if (!gf) { |
| complete(cs, -1, EBADF); |
| return; |
| } |
| switch (gf->type) { |
| case GuestFDGDB: |
| gdb_fstat(cs, complete, gf, addr); |
| break; |
| case GuestFDHost: |
| host_fstat(cs, complete, gf, addr); |
| break; |
| case GuestFDConsole: |
| console_fstat(cs, complete, gf, addr); |
| break; |
| case GuestFDStatic: |
| default: |
| g_assert_not_reached(); |
| } |
| } |
| |
| void semihost_sys_stat(CPUState *cs, gdb_syscall_complete_cb complete, |
| target_ulong fname, target_ulong fname_len, |
| target_ulong addr) |
| { |
| if (use_gdb_syscalls()) { |
| gdb_stat(cs, complete, fname, fname_len, addr); |
| } else { |
| host_stat(cs, complete, fname, fname_len, addr); |
| } |
| } |
| |
| void semihost_sys_remove(CPUState *cs, gdb_syscall_complete_cb complete, |
| target_ulong fname, target_ulong fname_len) |
| { |
| if (use_gdb_syscalls()) { |
| gdb_remove(cs, complete, fname, fname_len); |
| } else { |
| host_remove(cs, complete, fname, fname_len); |
| } |
| } |
| |
| void semihost_sys_rename(CPUState *cs, gdb_syscall_complete_cb complete, |
| target_ulong oname, target_ulong oname_len, |
| target_ulong nname, target_ulong nname_len) |
| { |
| if (use_gdb_syscalls()) { |
| gdb_rename(cs, complete, oname, oname_len, nname, nname_len); |
| } else { |
| host_rename(cs, complete, oname, oname_len, nname, nname_len); |
| } |
| } |
| |
| void semihost_sys_system(CPUState *cs, gdb_syscall_complete_cb complete, |
| target_ulong cmd, target_ulong cmd_len) |
| { |
| if (use_gdb_syscalls()) { |
| gdb_system(cs, complete, cmd, cmd_len); |
| } else { |
| host_system(cs, complete, cmd, cmd_len); |
| } |
| } |
| |
| void semihost_sys_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete, |
| target_ulong tv_addr, target_ulong tz_addr) |
| { |
| if (use_gdb_syscalls()) { |
| gdb_gettimeofday(cs, complete, tv_addr, tz_addr); |
| } else { |
| host_gettimeofday(cs, complete, tv_addr, tz_addr); |
| } |
| } |
| |
| #ifndef CONFIG_USER_ONLY |
| void semihost_sys_poll_one(CPUState *cs, gdb_syscall_complete_cb complete, |
| int fd, GIOCondition cond, int timeout) |
| { |
| GuestFD *gf = get_guestfd(fd); |
| |
| if (!gf) { |
| complete(cs, G_IO_NVAL, 1); |
| return; |
| } |
| switch (gf->type) { |
| case GuestFDGDB: |
| complete(cs, G_IO_NVAL, 1); |
| break; |
| case GuestFDHost: |
| host_poll_one(cs, complete, gf, cond, timeout); |
| break; |
| case GuestFDConsole: |
| console_poll_one(cs, complete, gf, cond, timeout); |
| break; |
| case GuestFDStatic: |
| default: |
| g_assert_not_reached(); |
| } |
| } |
| #endif |
