From: "H. Peter Anvin" <hpa@zytor.com>
To: Sam Ravnborg <sam@ravnborg.org>,
linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org,
linux-arch@vger.kernel.org
Cc: Andy Lutomirski <luto@amacapital.net>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: [PATCH RFC 04/10] tools: Add packed struct method for unaligned references
Date: Tue, 10 Jun 2014 16:13:08 -0700 [thread overview]
Message-ID: <1402441994-16780-5-git-send-email-hpa@zytor.com> (raw)
In-Reply-To: <1402441994-16780-1-git-send-email-hpa@zytor.com>
gcc can generate code for unaligned references using a packed struct
on nearly all architectures.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---
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 <stdint.h>
+
+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 <stdint.h>
+
+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
next prev parent reply other threads:[~2014-06-10 23:14 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-10 23:13 [PATCH RFC 00/10] tools: Revamp the unaligned endian access functions H. Peter Anvin
2014-06-10 23:13 ` [PATCH RFC 01/10] tools: Remove double-underscore symbols from user space byteshift functions H. Peter Anvin
2014-06-10 23:13 ` [PATCH RFC 02/10] tools: Create <tools/unaligned.h> and an unaligned subdirectory H. Peter Anvin
2014-06-10 23:13 ` [PATCH RFC 03/10] tools: Add le_direct/be_direct methods for unaligned access H. Peter Anvin
2014-06-10 23:25 ` Andy Lutomirski
2014-06-10 23:30 ` H. Peter Anvin
2014-06-10 23:33 ` Andy Lutomirski
2014-06-10 23:41 ` H. Peter Anvin
2014-06-10 23:13 ` H. Peter Anvin [this message]
2014-06-10 23:13 ` [PATCH RFC 05/10] tools: Add <endian.h> libc support for unaligned references H. Peter Anvin
2014-06-10 23:13 ` [PATCH RFC 06/10] tools: Add gcc __builtin_bswap*() " H. Peter Anvin
2014-06-10 23:13 ` [PATCH RFC 07/10] tools: Remove leading underscores from header guards H. Peter Anvin
2014-06-10 23:13 ` [PATCH RFC 08/10] tools: Move unaligned common infrastructure into <tools/unaligned.h> H. Peter Anvin
2014-06-10 23:13 ` [PATCH RFC 09/10] tools: Add common infrastructure for byte swapping H. Peter Anvin
2014-06-10 23:13 ` [PATCH RFC 10/10] tools: Use reasonable defaults for the default access H. Peter Anvin
2014-06-11 19:21 ` [PATCH RFC 00/10] tools: Revamp the unaligned endian access functions Sam Ravnborg
2014-06-11 21:52 ` H. Peter Anvin
2014-06-13 20:04 ` Sam Ravnborg
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