bsd-user: Implement shm_unlink(2) and shmget(2)

[mirror_qemu.git] / bsd-user / bsd-mem.h

diff --git a/bsd-user/bsd-mem.h b/bsd-user/bsd-mem.h
index b00ab3aed8ed99598ddbc67bae14906ab943c5bb..c362cc07a307ef8ace147059c7912874cd6b11c2 100644 (file)
--- a/bsd-user/bsd-mem.h
+++ b/bsd-user/bsd-mem.h
@@ -189,4 +189,120 @@ static inline abi_long do_bsd_minherit(abi_long addr, abi_long len,
     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 */