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bsd-user: Define target_arg64

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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>
This commit is contained in:
Warner Losh 2022-01-31 16:06:46 -07:00
parent 647afdf183
commit 0ff0508286
1 changed files with 13 additions and 0 deletions
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13
bsd-user/qemu.h
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@ -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"