From 40da8a7e4b94e4925bbc259e206d7f8690486263 Mon Sep 17 00:00:00 2001 From: Juergen Gross Date: Wed, 14 Feb 2024 10:41:59 +0100 Subject: [PATCH] tools: add access macros for unaligned data Add the basic access macros for unaligned data to common-macros.h. Signed-off-by: Juergen Gross Acked-by: Andrew Cooper Acked-by: Anthony PERARD --- tools/include/xen-tools/common-macros.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/tools/include/xen-tools/common-macros.h b/tools/include/xen-tools/common-macros.h index e5ed603904..81fba2e9f5 100644 --- a/tools/include/xen-tools/common-macros.h +++ b/tools/include/xen-tools/common-macros.h @@ -79,6 +79,10 @@ #define __must_check __attribute__((__warn_unused_result__)) #endif +#ifndef __packed +#define __packed __attribute__((__packed__)) +#endif + #define container_of(ptr, type, member) ({ \ typeof(((type *)0)->member) *mptr__ = (ptr); \ (type *)((char *)mptr__ - offsetof(type, member)); \ @@ -87,4 +91,17 @@ #define __AC(X, Y) (X ## Y) #define _AC(X, Y) __AC(X, Y) +#define get_unaligned_t(type, ptr) ({ \ + const struct { type x; } __packed *ptr_ = (typeof(ptr_))(ptr); \ + ptr_->x; \ +}) + +#define put_unaligned_t(type, val, ptr) do { \ + struct { type x; } __packed *ptr_ = (typeof(ptr_))(ptr); \ + ptr_->x = val; \ +} while (0) + +#define get_unaligned(ptr) get_unaligned_t(typeof(*(ptr)), ptr) +#define put_unaligned(val, ptr) put_unaligned_t(typeof(*(ptr)), val, ptr) + #endif /* __XEN_TOOLS_COMMON_MACROS__ */