From mboxrd@z Thu Jan 1 00:00:00 1970 From: "H. Peter Anvin" Subject: [PATCH RFC 04/10] tools: Add packed struct method for unaligned references Date: Tue, 10 Jun 2014 16:13:08 -0700 Message-ID: <1402441994-16780-5-git-send-email-hpa@zytor.com> References: <1402441994-16780-1-git-send-email-hpa@zytor.com> Return-path: Received: from terminus.zytor.com ([198.137.202.10]:38716 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753230AbaFJXNz (ORCPT ); Tue, 10 Jun 2014 19:13:55 -0400 In-Reply-To: <1402441994-16780-1-git-send-email-hpa@zytor.com> Sender: linux-arch-owner@vger.kernel.org List-ID: To: Sam Ravnborg , linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-arch@vger.kernel.org Cc: Andy Lutomirski , Andrew Morton , Ingo Molnar , Thomas Gleixner , "H. Peter Anvin" gcc can generate code for unaligned references using a packed struct on nearly all architectures. Signed-off-by: H. Peter Anvin --- tools/include/tools/unaligned/be_struct.h | 60 +++++++++++++++++++++++++++++++ tools/include/tools/unaligned/le_struct.h | 60 +++++++++++++++++++++++++++++++ 2 files changed, 120 insertions(+) create mode 100644 tools/include/tools/unaligned/be_struct.h create mode 100644 tools/include/tools/unaligned/le_struct.h diff --git a/tools/include/tools/unaligned/be_struct.h b/tools/include/tools/unaligned/be_struct.h new file mode 100644 index 000000000000..27b73bdf5a86 --- /dev/null +++ b/tools/include/tools/unaligned/be_struct.h @@ -0,0 +1,60 @@ +#ifndef _TOOLS_BE_STRUCT_H +#define _TOOLS_BE_STRUCT_H + +#include + +struct _packed_u16_struct { + uint16_t v; +} __attribute__((packed)); + +struct _packed_u32_struct { + uint32_t v; +} __attribute__((packed)); + +struct _packed_u64_struct { + uint64_t v; +} __attribute__((packed)); + +static inline uint16_t get_unaligned_be16(const void *_p) +{ + const struct _packed_u16_struct *p = _p; + + return p->v; +} + +static inline uint32_t get_unaligned_be32(const void *_p) +{ + const struct _packed_u32_struct *p = _p; + + return p->v; +} + +static inline uint64_t get_unaligned_be64(const void *_p) +{ + const struct _packed_u64_struct *p = _p; + + return p->v; +} + +static inline void put_unaligned_be16(uint16_t val, void *_p) +{ + struct _packed_u16_struct *p = _p; + + p->v = val; +} + +static inline void put_unaligned_be32(uint32_t val, void *_p) +{ + struct _packed_u32_struct *p = _p; + + p->v = val; +} + +static inline void put_unaligned_be64(uint64_t val, void *_p) +{ + struct _packed_u64_struct *p = _p; + + p->v = val; +} + +#endif /* _TOOLS_BE_STRUCT_H */ diff --git a/tools/include/tools/unaligned/le_struct.h b/tools/include/tools/unaligned/le_struct.h new file mode 100644 index 000000000000..281b03b8f316 --- /dev/null +++ b/tools/include/tools/unaligned/le_struct.h @@ -0,0 +1,60 @@ +#ifndef _TOOLS_LE_STRUCT_H +#define _TOOLS_LE_STRUCT_H + +#include + +struct _packed_u16_struct { + uint16_t v; +} __attribute__((packed)); + +struct _packed_u32_struct { + uint32_t v; +} __attribute__((packed)); + +struct _packed_u64_struct { + uint64_t v; +} __attribute__((packed)); + +static inline uint16_t get_unaligned_le16(const void *_p) +{ + const struct _packed_u16_struct *p = _p; + + return p->v; +} + +static inline uint32_t get_unaligned_le32(const void *_p) +{ + const struct _packed_u32_struct *p = _p; + + return p->v; +} + +static inline uint64_t get_unaligned_le64(const void *_p) +{ + const struct _packed_u64_struct *p = _p; + + return p->v; +} + +static inline void put_unaligned_le16(uint16_t val, void *_p) +{ + struct _packed_u16_struct *p = _p; + + p->v = val; +} + +static inline void put_unaligned_le32(uint32_t val, void *_p) +{ + struct _packed_u32_struct *p = _p; + + p->v = val; +} + +static inline void put_unaligned_le64(uint64_t val, void *_p) +{ + struct _packed_u64_struct *p = _p; + + p->v = val; +} + +#endif /* _TOOLS_LE_STRUCT_H */ -- 1.9.3