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[RFC,09/25] qemu/bswap: Introduce LD_CONVERT() macro

Message ID 20210518183655.1711377-10-philmd@redhat.com (mailing list archive)
State New, archived
Headers show
Series exec: Add load/store API for aligned pointers | expand

Commit Message

Philippe Mathieu-Daudé May 18, 2021, 6:36 p.m. UTC
To be able to add more load/store operations,
introduce the LD_CONVERT() macro.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 include/qemu/bswap.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
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Patch

diff --git a/include/qemu/bswap.h b/include/qemu/bswap.h
index 4e2bd2e97ee..c2fd4f31d20 100644
--- a/include/qemu/bswap.h
+++ b/include/qemu/bswap.h
@@ -434,18 +434,37 @@  static inline void stq_be_p(void *ptr, uint64_t v)
     stq_he_p(ptr, be_bswap(v, 64));
 }
 
+#define LD_CONVERT_UNALIGNED(bits, rtype, vtype, size)\
+static inline rtype ld ## size ## _he_p(const void *ptr)\
+{\
+    vtype r;\
+    __builtin_memcpy(&r, ptr, sizeof(r));\
+    return r;\
+}
+
 #define ST_CONVERT_UNALIGNED(bits, vtype, size)\
 static inline void st ## size ## _he_p(void *ptr, vtype v)\
 {\
     __builtin_memcpy(ptr, &v, sizeof(v));\
 }
 
+#define LD_CONVERT_END(endian, bits, rtype, vtype, size)\
+static inline rtype ld ## size ## _ ## endian ## _p(const void *ptr)\
+{\
+    return (vtype)glue(endian, _bswap)(ld ## size ## _he_p(ptr), bits);\
+}
+
 #define ST_CONVERT_END(endian, bits, vtype, size)\
 static inline void st ## size ## _ ## endian ## _p(void *ptr, vtype v)\
 {\
     st ## size ## _he_p(ptr, glue(endian, _bswap)(v, bits));\
 }
 
+#define LD_CONVERT(bits, rtype, vtype, size)\
+    LD_CONVERT_UNALIGNED(bits, rtype, vtype, size)\
+    LD_CONVERT_END(le, bits, rtype, vtype, size)\
+    LD_CONVERT_END(be, bits, rtype, vtype, size)
+
 #define ST_CONVERT(bits, vtype, size)\
     ST_CONVERT_UNALIGNED(bits, vtype, size)\
     ST_CONVERT_END(le, bits, vtype, size)\