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[PULL,15/16] bsd-user: Define target_arg64

Message ID 20220228181214.2602-16-imp@bsdimp.com
State New
Headers show
Series [PULL,01/16] bsd-user/main.c: Drop syscall flavor arg -bsd | expand

Commit Message

Warner Losh Feb. 28, 2022, 6:12 p.m. UTC 
target_arg64 is a generic way to extract 64-bits from a pair of
arguments. On 32-bit platforms, it returns them joined together as
appropriate. On 64-bit platforms, it returns the first arg because it's
already 64-bits.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Kyle Evans <kevans@FreeBSD.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
 bsd-user/qemu.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)
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Patch

diff --git a/bsd-user/qemu.h b/bsd-user/qemu.h
index a9efa807b78..af272c2a802 100644
--- a/bsd-user/qemu.h
+++ b/bsd-user/qemu.h
@@ -462,6 +462,19 @@  static inline void *lock_user_string(abi_ulong guest_addr)
 #define unlock_user_struct(host_ptr, guest_addr, copy)          \
     unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
 
+static inline uint64_t target_arg64(uint32_t word0, uint32_t word1)
+{
+#if TARGET_ABI_BITS == 32
+#ifdef TARGET_WORDS_BIGENDIAN
+    return ((uint64_t)word0 << 32) | word1;
+#else
+    return ((uint64_t)word1 << 32) | word0;
+#endif
+#else /* TARGET_ABI_BITS != 32 */
+    return word0;
+#endif /* TARGET_ABI_BITS != 32 */
+}
+
 #include <pthread.h>
 
 #include "user/safe-syscall.h"