diff options
Diffstat (limited to 'semihosting')
| -rw-r--r-- | semihosting/syscalls.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/semihosting/syscalls.c b/semihosting/syscalls.c index de846ced32..d21064716d 100644 --- a/semihosting/syscalls.c +++ b/semihosting/syscalls.c @@ -64,6 +64,52 @@ static int validate_lock_user_string(char **pstr, CPUState *cs, } /* + * 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. */ @@ -133,6 +179,19 @@ static void gdb_fstat(CPUState *cs, gdb_syscall_complete_cb complete, 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) { @@ -321,6 +380,51 @@ static void host_flen(CPUState *cs, gdb_syscall_complete_cb complete, } } +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) { @@ -629,6 +733,39 @@ void semihost_sys_flen(CPUState *cs, gdb_syscall_complete_cb fstat_cb, } } +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 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) { |