diff options
Diffstat (limited to 'bsd-user/freebsd/os-syscall.c')
| -rw-r--r-- | bsd-user/freebsd/os-syscall.c | 217 |
1 files changed, 213 insertions, 4 deletions
diff --git a/bsd-user/freebsd/os-syscall.c b/bsd-user/freebsd/os-syscall.c index d272478e7b..71aa0d38e0 100644 --- a/bsd-user/freebsd/os-syscall.c +++ b/bsd-user/freebsd/os-syscall.c @@ -41,6 +41,22 @@ #include "user/syscall-trace.h" #include "bsd-file.h" +#include "bsd-proc.h" + +/* I/O */ +safe_syscall3(ssize_t, read, int, fd, void *, buf, size_t, nbytes); +safe_syscall4(ssize_t, pread, int, fd, void *, buf, size_t, nbytes, off_t, + offset); +safe_syscall3(ssize_t, readv, int, fd, const struct iovec *, iov, int, iovcnt); +safe_syscall4(ssize_t, preadv, int, fd, const struct iovec *, iov, int, iovcnt, + off_t, offset); + +safe_syscall3(ssize_t, write, int, fd, void *, buf, size_t, nbytes); +safe_syscall4(ssize_t, pwrite, int, fd, void *, buf, size_t, nbytes, off_t, + offset); +safe_syscall3(ssize_t, writev, int, fd, const struct iovec *, iov, int, iovcnt); +safe_syscall4(ssize_t, pwritev, int, fd, const struct iovec *, iov, int, iovcnt, + off_t, offset); void target_set_brk(abi_ulong new_brk) { @@ -74,16 +90,209 @@ bool is_error(abi_long ret) } /* - * do_syscall() should always have a single exit point at the end so that - * actions, such as logging of syscall results, can be performed. All errnos - * that do_syscall() returns must be -TARGET_<errcode>. + * Unlocks a iovec. Unlike unlock_iovec, it assumes the tvec array itself is + * already locked from target_addr. It will be unlocked as well as all the iovec + * elements. + */ +static void helper_unlock_iovec(struct target_iovec *target_vec, + abi_ulong target_addr, struct iovec *vec, + int count, int copy) +{ + for (int i = 0; i < count; i++) { + abi_ulong base = tswapal(target_vec[i].iov_base); + + if (vec[i].iov_base) { + unlock_user(vec[i].iov_base, base, copy ? vec[i].iov_len : 0); + } + } + unlock_user(target_vec, target_addr, 0); +} + +struct iovec *lock_iovec(int type, abi_ulong target_addr, + int count, int copy) +{ + struct target_iovec *target_vec; + struct iovec *vec; + abi_ulong total_len, max_len; + int i; + int err = 0; + + if (count == 0) { + errno = 0; + return NULL; + } + if (count < 0 || count > IOV_MAX) { + errno = EINVAL; + return NULL; + } + + vec = g_try_new0(struct iovec, count); + if (vec == NULL) { + errno = ENOMEM; + return NULL; + } + + target_vec = lock_user(VERIFY_READ, target_addr, + count * sizeof(struct target_iovec), 1); + if (target_vec == NULL) { + err = EFAULT; + goto fail2; + } + + max_len = 0x7fffffff & MIN(TARGET_PAGE_MASK, PAGE_MASK); + total_len = 0; + + for (i = 0; i < count; i++) { + abi_ulong base = tswapal(target_vec[i].iov_base); + abi_long len = tswapal(target_vec[i].iov_len); + + if (len < 0) { + err = EINVAL; + goto fail; + } else if (len == 0) { + /* Zero length pointer is ignored. */ + vec[i].iov_base = 0; + } else { + vec[i].iov_base = lock_user(type, base, len, copy); + /* + * If the first buffer pointer is bad, this is a fault. But + * subsequent bad buffers will result in a partial write; this is + * realized by filling the vector with null pointers and zero + * lengths. + */ + if (!vec[i].iov_base) { + if (i == 0) { + err = EFAULT; + goto fail; + } else { + /* + * Fail all the subsequent addresses, they are already + * zero'd. + */ + goto out; + } + } + if (len > max_len - total_len) { + len = max_len - total_len; + } + } + vec[i].iov_len = len; + total_len += len; + } +out: + unlock_user(target_vec, target_addr, 0); + return vec; + +fail: + helper_unlock_iovec(target_vec, target_addr, vec, i, copy); +fail2: + g_free(vec); + errno = err; + return NULL; +} + +void unlock_iovec(struct iovec *vec, abi_ulong target_addr, + int count, int copy) +{ + struct target_iovec *target_vec; + + target_vec = lock_user(VERIFY_READ, target_addr, + count * sizeof(struct target_iovec), 1); + if (target_vec) { + helper_unlock_iovec(target_vec, target_addr, vec, count, copy); + } + + g_free(vec); +} + +/* + * All errnos that freebsd_syscall() returns must be -TARGET_<errcode>. + */ +static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1, + abi_long arg2, abi_long arg3, abi_long arg4, + abi_long arg5, abi_long arg6, abi_long arg7, + abi_long arg8) +{ + abi_long ret; + + switch (num) { + /* + * process system calls + */ + case TARGET_FREEBSD_NR_exit: /* exit(2) */ + ret = do_bsd_exit(cpu_env, arg1); + break; + + /* + * File system calls. + */ + case TARGET_FREEBSD_NR_read: /* read(2) */ + ret = do_bsd_read(arg1, arg2, arg3); + break; + + case TARGET_FREEBSD_NR_pread: /* pread(2) */ + ret = do_bsd_pread(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); + break; + + case TARGET_FREEBSD_NR_readv: /* readv(2) */ + ret = do_bsd_readv(arg1, arg2, arg3); + break; + + case TARGET_FREEBSD_NR_preadv: /* preadv(2) */ + ret = do_bsd_preadv(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); + + case TARGET_FREEBSD_NR_write: /* write(2) */ + ret = do_bsd_write(arg1, arg2, arg3); + break; + + case TARGET_FREEBSD_NR_pwrite: /* pwrite(2) */ + ret = do_bsd_pwrite(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); + break; + + case TARGET_FREEBSD_NR_writev: /* writev(2) */ + ret = do_bsd_writev(arg1, arg2, arg3); + break; + + case TARGET_FREEBSD_NR_pwritev: /* pwritev(2) */ + ret = do_bsd_pwritev(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); + break; + + default: + qemu_log_mask(LOG_UNIMP, "Unsupported syscall: %d\n", num); + ret = -TARGET_ENOSYS; + break; + } + + return ret; +} + +/* + * do_freebsd_syscall() should always have a single exit point at the end so + * that actions, such as logging of syscall results, can be performed. This + * as a wrapper around freebsd_syscall() so that actually happens. Since + * that is a singleton, modern compilers will inline it anyway... */ abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1, abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6, abi_long arg7, abi_long arg8) { - return 0; + CPUState *cpu = env_cpu(cpu_env); + int ret; + + trace_guest_user_syscall(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8); + if (do_strace) { + print_freebsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6); + } + + ret = freebsd_syscall(cpu_env, num, arg1, arg2, arg3, arg4, arg5, arg6, + arg7, arg8); + if (do_strace) { + print_freebsd_syscall_ret(num, ret); + } + trace_guest_user_syscall_ret(cpu, num, ret); + + return ret; } void syscall_init(void) |