979 lines
26 KiB
C
979 lines
26 KiB
C
/*
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* Syscall implementations for semihosting.
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*
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* Copyright (c) 2022 Linaro
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "qemu/osdep.h"
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#include "exec/gdbstub.h"
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#include "semihosting/guestfd.h"
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#include "semihosting/syscalls.h"
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#include "semihosting/console.h"
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#ifdef CONFIG_USER_ONLY
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#include "qemu.h"
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#else
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#include "semihosting/softmmu-uaccess.h"
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#endif
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/*
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* Validate or compute the length of the string (including terminator).
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*/
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static int validate_strlen(CPUState *cs, target_ulong str, target_ulong tlen)
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{
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CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
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char c;
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if (tlen == 0) {
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ssize_t slen = target_strlen(str);
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if (slen < 0) {
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return -EFAULT;
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}
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if (slen >= INT32_MAX) {
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return -ENAMETOOLONG;
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}
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return slen + 1;
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}
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if (tlen > INT32_MAX) {
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return -ENAMETOOLONG;
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}
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if (get_user_u8(c, str + tlen - 1)) {
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return -EFAULT;
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}
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if (c != 0) {
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return -EINVAL;
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}
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return tlen;
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}
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static int validate_lock_user_string(char **pstr, CPUState *cs,
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target_ulong tstr, target_ulong tlen)
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{
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int ret = validate_strlen(cs, tstr, tlen);
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CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
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char *str = NULL;
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if (ret > 0) {
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str = lock_user(VERIFY_READ, tstr, ret, true);
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ret = str ? 0 : -EFAULT;
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}
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*pstr = str;
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return ret;
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}
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/*
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* TODO: Note that gdb always stores the stat structure big-endian.
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* So far, that's ok, as the only two targets using this are also
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* big-endian. Until we do something with gdb, also produce the
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* same big-endian result from the host.
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*/
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static int copy_stat_to_user(CPUState *cs, target_ulong addr,
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const struct stat *s)
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{
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CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
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struct gdb_stat *p;
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if (s->st_dev != (uint32_t)s->st_dev ||
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s->st_ino != (uint32_t)s->st_ino) {
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return -EOVERFLOW;
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}
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p = lock_user(VERIFY_WRITE, addr, sizeof(struct gdb_stat), 0);
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if (!p) {
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return -EFAULT;
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}
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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 gdb_stat));
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return 0;
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}
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/*
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* GDB semihosting syscall implementations.
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*/
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static gdb_syscall_complete_cb gdb_open_complete;
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static void gdb_open_cb(CPUState *cs, uint64_t ret, int err)
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{
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if (!err) {
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int guestfd = alloc_guestfd();
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associate_guestfd(guestfd, ret);
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ret = guestfd;
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}
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gdb_open_complete(cs, ret, err);
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}
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static void gdb_open(CPUState *cs, gdb_syscall_complete_cb complete,
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target_ulong fname, target_ulong fname_len,
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int gdb_flags, int mode)
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{
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int len = validate_strlen(cs, fname, fname_len);
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if (len < 0) {
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complete(cs, -1, -len);
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return;
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}
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gdb_open_complete = complete;
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gdb_do_syscall(gdb_open_cb, "open,%s,%x,%x",
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fname, len, (target_ulong)gdb_flags, (target_ulong)mode);
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}
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static void gdb_close(CPUState *cs, gdb_syscall_complete_cb complete,
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GuestFD *gf)
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{
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gdb_do_syscall(complete, "close,%x", (target_ulong)gf->hostfd);
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}
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static void gdb_read(CPUState *cs, gdb_syscall_complete_cb complete,
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GuestFD *gf, target_ulong buf, target_ulong len)
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{
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gdb_do_syscall(complete, "read,%x,%x,%x",
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(target_ulong)gf->hostfd, buf, len);
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}
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static void gdb_write(CPUState *cs, gdb_syscall_complete_cb complete,
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GuestFD *gf, target_ulong buf, target_ulong len)
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{
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gdb_do_syscall(complete, "write,%x,%x,%x",
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(target_ulong)gf->hostfd, buf, len);
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}
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static void gdb_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
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GuestFD *gf, int64_t off, int gdb_whence)
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{
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gdb_do_syscall(complete, "lseek,%x,%lx,%x",
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(target_ulong)gf->hostfd, off, (target_ulong)gdb_whence);
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}
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static void gdb_isatty(CPUState *cs, gdb_syscall_complete_cb complete,
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GuestFD *gf)
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{
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gdb_do_syscall(complete, "isatty,%x", (target_ulong)gf->hostfd);
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}
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static void gdb_fstat(CPUState *cs, gdb_syscall_complete_cb complete,
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GuestFD *gf, target_ulong addr)
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{
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gdb_do_syscall(complete, "fstat,%x,%x", (target_ulong)gf->hostfd, addr);
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}
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static void gdb_stat(CPUState *cs, gdb_syscall_complete_cb complete,
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target_ulong fname, target_ulong fname_len,
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target_ulong addr)
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{
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int len = validate_strlen(cs, fname, fname_len);
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if (len < 0) {
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complete(cs, -1, -len);
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return;
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}
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gdb_do_syscall(complete, "stat,%s,%x", fname, len, addr);
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}
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static void gdb_remove(CPUState *cs, gdb_syscall_complete_cb complete,
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target_ulong fname, target_ulong fname_len)
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{
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int len = validate_strlen(cs, fname, fname_len);
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if (len < 0) {
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complete(cs, -1, -len);
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return;
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}
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gdb_do_syscall(complete, "unlink,%s", fname, len);
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}
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static void gdb_rename(CPUState *cs, gdb_syscall_complete_cb complete,
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target_ulong oname, target_ulong oname_len,
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target_ulong nname, target_ulong nname_len)
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{
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int olen, nlen;
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olen = validate_strlen(cs, oname, oname_len);
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if (olen < 0) {
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complete(cs, -1, -olen);
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return;
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}
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nlen = validate_strlen(cs, nname, nname_len);
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if (nlen < 0) {
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complete(cs, -1, -nlen);
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return;
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}
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gdb_do_syscall(complete, "rename,%s,%s", oname, olen, nname, nlen);
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}
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static void gdb_system(CPUState *cs, gdb_syscall_complete_cb complete,
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target_ulong cmd, target_ulong cmd_len)
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{
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int len = validate_strlen(cs, cmd, cmd_len);
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if (len < 0) {
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complete(cs, -1, -len);
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return;
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}
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gdb_do_syscall(complete, "system,%s", cmd, len);
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}
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static void gdb_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete,
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target_ulong tv_addr, target_ulong tz_addr)
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{
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gdb_do_syscall(complete, "gettimeofday,%x,%x", tv_addr, tz_addr);
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}
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/*
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* Host semihosting syscall implementations.
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*/
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static void host_open(CPUState *cs, gdb_syscall_complete_cb complete,
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target_ulong fname, target_ulong fname_len,
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int gdb_flags, int mode)
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{
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CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
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char *p;
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int ret, host_flags;
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ret = validate_lock_user_string(&p, cs, fname, fname_len);
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if (ret < 0) {
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complete(cs, -1, -ret);
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return;
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}
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if (gdb_flags & GDB_O_WRONLY) {
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host_flags = O_WRONLY;
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} else if (gdb_flags & GDB_O_RDWR) {
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host_flags = O_RDWR;
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} else {
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host_flags = O_RDONLY;
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}
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if (gdb_flags & GDB_O_CREAT) {
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host_flags |= O_CREAT;
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}
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if (gdb_flags & GDB_O_TRUNC) {
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host_flags |= O_TRUNC;
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}
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if (gdb_flags & GDB_O_EXCL) {
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host_flags |= O_EXCL;
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}
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ret = open(p, host_flags, mode);
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if (ret < 0) {
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complete(cs, -1, errno);
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} else {
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int guestfd = alloc_guestfd();
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associate_guestfd(guestfd, ret);
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complete(cs, guestfd, 0);
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}
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unlock_user(p, fname, 0);
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}
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static void host_close(CPUState *cs, gdb_syscall_complete_cb complete,
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GuestFD *gf)
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{
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/*
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* Only close the underlying host fd if it's one we opened on behalf
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* of the guest in SYS_OPEN.
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*/
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if (gf->hostfd != STDIN_FILENO &&
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gf->hostfd != STDOUT_FILENO &&
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gf->hostfd != STDERR_FILENO &&
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close(gf->hostfd) < 0) {
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complete(cs, -1, errno);
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} else {
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complete(cs, 0, 0);
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}
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}
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static void host_read(CPUState *cs, gdb_syscall_complete_cb complete,
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GuestFD *gf, target_ulong buf, target_ulong len)
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{
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CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
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void *ptr = lock_user(VERIFY_WRITE, buf, len, 0);
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ssize_t ret;
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if (!ptr) {
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complete(cs, -1, EFAULT);
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return;
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}
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do {
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ret = read(gf->hostfd, ptr, len);
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} while (ret == -1 && errno == EINTR);
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if (ret == -1) {
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complete(cs, -1, errno);
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unlock_user(ptr, buf, 0);
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} else {
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complete(cs, ret, 0);
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unlock_user(ptr, buf, ret);
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}
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}
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static void host_write(CPUState *cs, gdb_syscall_complete_cb complete,
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GuestFD *gf, target_ulong buf, target_ulong len)
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{
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CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
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void *ptr = lock_user(VERIFY_READ, buf, len, 1);
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ssize_t ret;
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if (!ptr) {
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complete(cs, -1, EFAULT);
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return;
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}
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ret = write(gf->hostfd, ptr, len);
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complete(cs, ret, ret == -1 ? errno : 0);
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unlock_user(ptr, buf, 0);
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}
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static void host_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
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GuestFD *gf, int64_t off, int whence)
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{
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/* So far, all hosts use the same values. */
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QEMU_BUILD_BUG_ON(GDB_SEEK_SET != SEEK_SET);
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QEMU_BUILD_BUG_ON(GDB_SEEK_CUR != SEEK_CUR);
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QEMU_BUILD_BUG_ON(GDB_SEEK_END != SEEK_END);
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off_t ret = off;
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int err = 0;
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if (ret == off) {
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ret = lseek(gf->hostfd, ret, whence);
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if (ret == -1) {
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err = errno;
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}
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} else {
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ret = -1;
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err = EINVAL;
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}
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complete(cs, ret, err);
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}
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static void host_isatty(CPUState *cs, gdb_syscall_complete_cb complete,
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GuestFD *gf)
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{
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int ret = isatty(gf->hostfd);
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complete(cs, ret, ret ? 0 : errno);
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}
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static void host_flen(CPUState *cs, gdb_syscall_complete_cb complete,
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GuestFD *gf)
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{
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struct stat buf;
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if (fstat(gf->hostfd, &buf) < 0) {
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complete(cs, -1, errno);
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} else {
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complete(cs, buf.st_size, 0);
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}
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}
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static void host_fstat(CPUState *cs, gdb_syscall_complete_cb complete,
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GuestFD *gf, target_ulong addr)
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{
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struct stat buf;
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int ret;
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ret = fstat(gf->hostfd, &buf);
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if (ret) {
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complete(cs, -1, errno);
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return;
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}
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ret = copy_stat_to_user(cs, addr, &buf);
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complete(cs, ret ? -1 : 0, ret ? -ret : 0);
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}
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static void host_stat(CPUState *cs, gdb_syscall_complete_cb complete,
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target_ulong fname, target_ulong fname_len,
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target_ulong addr)
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{
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CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
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struct stat buf;
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char *name;
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int ret, err;
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ret = validate_lock_user_string(&name, cs, fname, fname_len);
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if (ret < 0) {
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complete(cs, -1, -ret);
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return;
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}
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ret = stat(name, &buf);
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if (ret) {
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err = errno;
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} else {
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ret = copy_stat_to_user(cs, addr, &buf);
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err = 0;
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if (ret < 0) {
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err = -ret;
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ret = -1;
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}
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}
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complete(cs, ret, err);
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unlock_user(name, fname, 0);
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}
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static void host_remove(CPUState *cs, gdb_syscall_complete_cb complete,
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target_ulong fname, target_ulong fname_len)
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{
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CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
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char *p;
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int ret;
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ret = validate_lock_user_string(&p, cs, fname, fname_len);
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if (ret < 0) {
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complete(cs, -1, -ret);
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return;
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}
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ret = remove(p);
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complete(cs, ret, ret ? errno : 0);
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unlock_user(p, fname, 0);
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}
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static void host_rename(CPUState *cs, gdb_syscall_complete_cb complete,
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target_ulong oname, target_ulong oname_len,
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target_ulong nname, target_ulong nname_len)
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{
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CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
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char *ostr, *nstr;
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int ret;
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ret = validate_lock_user_string(&ostr, cs, oname, oname_len);
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if (ret < 0) {
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complete(cs, -1, -ret);
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return;
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}
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ret = validate_lock_user_string(&nstr, cs, nname, nname_len);
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if (ret < 0) {
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unlock_user(ostr, oname, 0);
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complete(cs, -1, -ret);
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return;
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}
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ret = rename(ostr, nstr);
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complete(cs, ret, ret ? errno : 0);
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unlock_user(ostr, oname, 0);
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unlock_user(nstr, nname, 0);
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}
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static void host_system(CPUState *cs, gdb_syscall_complete_cb complete,
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target_ulong cmd, target_ulong cmd_len)
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{
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CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
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char *p;
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int ret;
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ret = validate_lock_user_string(&p, cs, cmd, cmd_len);
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if (ret < 0) {
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complete(cs, -1, -ret);
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return;
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}
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ret = system(p);
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complete(cs, ret, ret == -1 ? errno : 0);
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unlock_user(p, cmd, 0);
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}
|
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static void host_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete,
|
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target_ulong tv_addr, target_ulong tz_addr)
|
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{
|
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CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
|
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struct gdb_timeval *p;
|
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int64_t rt;
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|
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/* GDB fails on non-null TZ, so be consistent. */
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if (tz_addr != 0) {
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complete(cs, -1, EINVAL);
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return;
|
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}
|
|
|
|
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
|