[PATCH v6 17/23] bsd-user: Implement mincore(2)

[Karim Taha <kariem.taha2.7@gmail.com>]

From: Stacey Son <sson@FreeBSD.org>

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Karim Taha <kariem.taha2.7@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
 bsd-user/bsd-mem.h            | 23 +++++++++++++++++++++++
 bsd-user/freebsd/os-syscall.c |  4 ++++
 2 files changed, 27 insertions(+)

diff --git a/bsd-user/bsd-mem.h b/bsd-user/bsd-mem.h
index b00ab3aed8..0c8d96d9a4 100644
--- a/bsd-user/bsd-mem.h
+++ b/bsd-user/bsd-mem.h
@@ -189,4 +189,27 @@ 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;
+}
+
 #endif /* BSD_USER_BSD_MEM_H */
diff --git a/bsd-user/freebsd/os-syscall.c b/bsd-user/freebsd/os-syscall.c
index 600d048120..8ba5fcc6ca 100644
--- a/bsd-user/freebsd/os-syscall.c
+++ b/bsd-user/freebsd/os-syscall.c
@@ -635,6 +635,10 @@ static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1,
         ret = do_bsd_minherit(arg1, arg2, arg3);
         break;
 
+    case TARGET_FREEBSD_NR_mincore: /* mincore(2) */
+        ret = do_bsd_mincore(arg1, arg2, arg3);
+        break;
+
 #if defined(__FreeBSD_version) && __FreeBSD_version >= 1300048
     case TARGET_FREEBSD_NR_shm_open2: /* shm_open2(2) */
         ret = do_freebsd_shm_open2(arg1, arg2, arg3, arg4, arg5);
-- 
2.42.0