return get_errno(target_munmap(arg1, arg2));
}
+/* mprotect(2) */
+static inline abi_long do_bsd_mprotect(abi_long arg1, abi_long arg2,
+ abi_long arg3)
+{
+ return get_errno(target_mprotect(arg1, arg2, arg3));
+}
+
+/* msync(2) */
+static inline abi_long do_bsd_msync(abi_long addr, abi_long len, abi_long flags)
+{
+ if (!guest_range_valid_untagged(addr, len)) {
+ /* It seems odd, but POSIX wants this to be ENOMEM */
+ return -TARGET_ENOMEM;
+ }
+
+ return get_errno(msync(g2h_untagged(addr), len, flags));
+}
+
+/* mlock(2) */
+static inline abi_long do_bsd_mlock(abi_long arg1, abi_long arg2)
+{
+ if (!guest_range_valid_untagged(arg1, arg2)) {
+ return -TARGET_EINVAL;
+ }
+ return get_errno(mlock(g2h_untagged(arg1), arg2));
+}
+
+/* munlock(2) */
+static inline abi_long do_bsd_munlock(abi_long arg1, abi_long arg2)
+{
+ if (!guest_range_valid_untagged(arg1, arg2)) {
+ return -TARGET_EINVAL;
+ }
+ return get_errno(munlock(g2h_untagged(arg1), arg2));
+}
+
+/* mlockall(2) */
+static inline abi_long do_bsd_mlockall(abi_long arg1)
+{
+ return get_errno(mlockall(arg1));
+}
+
+/* munlockall(2) */
+static inline abi_long do_bsd_munlockall(void)
+{
+ return get_errno(munlockall());
+}
+
+/* madvise(2) */
+static inline abi_long do_bsd_madvise(abi_long arg1, abi_long arg2,
+ abi_long arg3)
+{
+ abi_ulong len;
+ int ret = 0;
+ abi_long start = arg1;
+ abi_long len_in = arg2;
+ abi_long advice = arg3;
+
+ if (start & ~TARGET_PAGE_MASK) {
+ return -TARGET_EINVAL;
+ }
+ if (len_in == 0) {
+ return 0;
+ }
+ len = TARGET_PAGE_ALIGN(len_in);
+ if (len == 0 || !guest_range_valid_untagged(start, len)) {
+ return -TARGET_EINVAL;
+ }
+
+ /*
+ * Most advice values are hints, so ignoring and returning success is ok.
+ *
+ * However, some advice values such as MADV_DONTNEED, are not hints and
+ * need to be emulated.
+ *
+ * A straight passthrough for those may not be safe because qemu sometimes
+ * turns private file-backed mappings into anonymous mappings.
+ * If all guest pages have PAGE_PASSTHROUGH set, mappings have the
+ * same semantics for the host as for the guest.
+ *
+ * MADV_DONTNEED is passed through, if possible.
+ * If passthrough isn't possible, we nevertheless (wrongly!) return
+ * success, which is broken but some userspace programs fail to work
+ * otherwise. Completely implementing such emulation is quite complicated
+ * though.
+ */
+ mmap_lock();
+ switch (advice) {
+ case MADV_DONTNEED:
+ if (page_check_range(start, len, PAGE_PASSTHROUGH)) {
+ ret = get_errno(madvise(g2h_untagged(start), len, advice));
+ if (ret == 0) {
+ page_reset_target_data(start, start + len - 1);
+ }
+ }
+ }
+ mmap_unlock();
+
+ return ret;
+}
+
+/* minherit(2) */
+static inline abi_long do_bsd_minherit(abi_long addr, abi_long len,
+ abi_long inherit)
+{
+ return get_errno(minherit(g2h_untagged(addr), len, inherit));
+}
+
+/* mincore(2) */
+static inline abi_long do_bsd_mincore(abi_ulong target_addr, abi_ulong len,
+ abi_ulong target_vec)
+{
+ abi_long ret;
+ void *p;
+ abi_ulong vec_len = DIV_ROUND_UP(len, TARGET_PAGE_SIZE);
+
+ if (!guest_range_valid_untagged(target_addr, len)
+ || !page_check_range(target_addr, len, PAGE_VALID)) {
+ return -TARGET_EFAULT;
+ }
+
+ p = lock_user(VERIFY_WRITE, target_vec, vec_len, 0);
+ if (p == NULL) {
+ return -TARGET_EFAULT;
+ }
+ ret = get_errno(mincore(g2h_untagged(target_addr), len, p));
+ unlock_user(p, target_vec, vec_len);
+
+ return ret;
+}
+
+/* do_brk() must return target values and target errnos. */
+static inline abi_long do_obreak(abi_ulong brk_val)
+{
+ abi_long mapped_addr;
+ abi_ulong new_brk;
+ abi_ulong old_brk;
+
+ /* brk pointers are always untagged */
+
+ /* do not allow to shrink below initial brk value */
+ if (brk_val < initial_target_brk) {
+ return target_brk;
+ }
+
+ new_brk = TARGET_PAGE_ALIGN(brk_val);
+ old_brk = TARGET_PAGE_ALIGN(target_brk);
+
+ /* new and old target_brk might be on the same page */
+ if (new_brk == old_brk) {
+ target_brk = brk_val;
+ return target_brk;
+ }
+
+ /* Release heap if necesary */
+ if (new_brk < old_brk) {
+ target_munmap(new_brk, old_brk - new_brk);
+
+ target_brk = brk_val;
+ return target_brk;
+ }
+
+ mapped_addr = target_mmap(old_brk, new_brk - old_brk,
+ PROT_READ | PROT_WRITE,
+ MAP_FIXED | MAP_EXCL | MAP_ANON | MAP_PRIVATE,
+ -1, 0);
+
+ if (mapped_addr == old_brk) {
+ target_brk = brk_val;
+ return target_brk;
+ }
+
+ /* For everything else, return the previous break. */
+ return target_brk;
+}
+
+/* shm_open(2) */
+static inline abi_long do_bsd_shm_open(abi_ulong arg1, abi_long arg2,
+ abi_long arg3)
+{
+ int ret;
+ void *p;
+
+ if (arg1 == (uintptr_t)SHM_ANON) {
+ p = SHM_ANON;
+ } else {
+ p = lock_user_string(arg1);
+ if (p == NULL) {
+ return -TARGET_EFAULT;
+ }
+ }
+ ret = get_errno(shm_open(p, target_to_host_bitmask(arg2, fcntl_flags_tbl),
+ arg3));
+
+ if (p != SHM_ANON) {
+ unlock_user(p, arg1, 0);
+ }
+
+ return ret;
+}
+
+/* shm_unlink(2) */
+static inline abi_long do_bsd_shm_unlink(abi_ulong arg1)
+{
+ int ret;
+ void *p;
+
+ p = lock_user_string(arg1);
+ if (p == NULL) {
+ return -TARGET_EFAULT;
+ }
+ ret = get_errno(shm_unlink(p)); /* XXX path(p)? */
+ unlock_user(p, arg1, 0);
+
+ return ret;
+}
+
+/* shmget(2) */
+static inline abi_long do_bsd_shmget(abi_long arg1, abi_ulong arg2,
+ abi_long arg3)
+{
+ return get_errno(shmget(arg1, arg2, arg3));
+}
+
#endif /* BSD_USER_BSD_MEM_H */
projects / mirror_qemu.git / blobdiff