diff mbox series

[v3,03/11] Signed-off-by: Karim Taha <kariem.taha2.7@gmail.com>

Message ID 20230421164200.2913-4-kariem.taha2.7@gmail.com
State New
Headers show
Series Contribution task implementations, for the 'FreeBSD user emulation improvements' project. | expand

Commit Message

Karim Taha April 21, 2023, 4:41 p.m. UTC 
From: Sean Bruno <sbruno@FreeBSD.org>

Target cmsghdr struct and flags.

Add the cmsghdr struct and alignment flags.

Co-authored-by: Kyle Evans <kevans@FreeBSD.org>
Signed-off-by: Karim Taha <kariem.taha2.7@gmail.com>
---
 bsd-user/syscall_defs.h | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
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Patch

diff --git a/bsd-user/syscall_defs.h b/bsd-user/syscall_defs.h
index f041245792..b594fafecc 100644
--- a/bsd-user/syscall_defs.h
+++ b/bsd-user/syscall_defs.h
@@ -275,6 +275,44 @@  struct target_cmsghdr {
     int32_t     cmsg_type;
 };
 
+/*
+ * mips32 is the exception to the general rule of long-alignment; it
+ * unconditionally uses 64-bit alignment instead.
+ */
+#if defined(TARGET_MIPS) && TARGET_ABI_BITS == 32
+#define TARGET_ALIGNBYTES   (sizeof(abi_llong) - 1)
+#else
+#define TARGET_ALIGNBYTES   (sizeof(abi_long) - 1)
+#endif
+
+#define TARGET_CMSG_NXTHDR(mhdr, cmsg, cmsg_start) \
+                               __target_cmsg_nxthdr(mhdr, cmsg, cmsg_start)
+#define TARGET_CMSG_ALIGN(len) (((len) + TARGET_ALIGNBYTES) \
+                               & (size_t) ~TARGET_ALIGNBYTES)
+#define TARGET_CMSG_DATA(cmsg) \
+    ((unsigned char *)(cmsg) + TARGET_CMSG_ALIGN(sizeof(struct target_cmsghdr)))
+#define TARGET_CMSG_SPACE(len) \
+    (TARGET_CMSG_ALIGN(sizeof(struct target_cmsghdr)) + TARGET_CMSG_ALIGN(len))
+#define TARGET_CMSG_LEN(len) \
+    (TARGET_CMSG_ALIGN(sizeof(struct target_cmsghdr)) + (len))
+
+static inline struct target_cmsghdr *
+__target_cmsg_nxthdr(struct target_msghdr *__mhdr,
+                     struct target_cmsghdr *__cmsg,
+                     struct target_cmsghdr *__cmsg_start)
+{
+    struct target_cmsghdr *__ptr;
+
+    __ptr = (struct target_cmsghdr *)((unsigned char *) __cmsg +
+        TARGET_CMSG_ALIGN(tswap32(__cmsg->cmsg_len)));
+    if ((unsigned long)((char *)(__ptr + 1) - (char *)__cmsg_start) >
+        tswap32(__mhdr->msg_controllen)) {
+        /* No more entries.  */
+        return (struct target_cmsghdr *)0;
+    }
+    return __ptr;
+}
+
 /*
  * netinet/in.h
  */