From 8c6fc0c15415b32080a848bbde640e104098cf13 Mon Sep 17 00:00:00 2001
From: Carlos Maiolino <cem@maiolino.dev>
Date: Thu, 10 Jul 2025 22:18:39 +0200
Subject: Initial drop

Add some riscv code

Signed-off-by: Carlos Maiolino <cem@toxiclabs.cc>
---
 riscv/riscv-probe/libfemto/include/endian.h | 95 +++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 riscv/riscv-probe/libfemto/include/endian.h

(limited to 'riscv/riscv-probe/libfemto/include/endian.h')

diff --git a/riscv/riscv-probe/libfemto/include/endian.h b/riscv/riscv-probe/libfemto/include/endian.h
new file mode 100644
index 0000000..8510f29
--- /dev/null
+++ b/riscv/riscv-probe/libfemto/include/endian.h
@@ -0,0 +1,95 @@
+#pragma once
+
+#define bswap16(x) __builtin_bswap16(x)
+#define bswap32(x) __builtin_bswap32(x)
+#define bswap64(x) __builtin_bswap64(x)
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+static inline uint16_t htobe16(uint16_t x) { return bswap16(x); }
+static inline uint16_t htole16(uint16_t x) { return x; }
+static inline uint16_t be16toh(uint16_t x) { return bswap16(x); }
+static inline uint16_t le16toh(uint16_t x) { return x; }
+
+static inline uint32_t htobe32(uint32_t x) { return bswap32(x); }
+static inline uint32_t htole32(uint32_t x) { return x; }
+static inline uint32_t be32toh(uint32_t x) { return bswap32(x); }
+static inline uint32_t le32toh(uint32_t x) { return x; }
+
+static inline uint64_t htobe64(uint64_t x) { return bswap64(x); }
+static inline uint64_t htole64(uint64_t x) { return x; }
+static inline uint64_t be64toh(uint64_t x) { return bswap64(x); }
+static inline uint64_t le64toh(uint64_t x) { return x; }
+#elif __BYTE_ORDER == __BIG_ENDIAN
+static inline uint16_t htobe16(uint16_t x) { return x; }
+static inline uint16_t htole16(uint16_t x) { return bswap16(x); }
+static inline uint16_t be16toh(uint16_t x) { return x; }
+static inline uint16_t le16toh(uint16_t x) { return bswap16(x); }
+
+static inline uint32_t htobe32(uint32_t x) { return x; }
+static inline uint32_t htole32(uint32_t x) { return bswap32(x); }
+static inline uint32_t be32toh(uint32_t x) { return x; }
+static inline uint32_t le32toh(uint16_t x) { return bswap64(x); }
+
+static inline uint64_t htobe64(uint64_t x) { return x; }
+static inline uint64_t htole64(uint64_t x) { return bswap64(x); }
+static inline uint64_t be64toh(uint64_t x) { return x; }
+static inline uint64_t le64toh(uint64_t x) { return bswap64(x); }
+#endif
+
+#if __SIZE_WIDTH__ == 32
+#define _htobel htobe32
+#define _beltoh be32toh
+#define _htolel htole32
+#define _leltoh le32toh
+#endif
+
+#if __SIZE_WIDTH__ == 64
+#define _htobel htobe64
+#define _beltoh be64toh
+#define _htolel htole64
+#define _leltoh le64toh
+#endif
+
+#define htobe(X) _Generic((X),                \
+                 short: htobe16,              \
+                 unsigned short: htobe16,     \
+                 int: htobe32,                \
+                 unsigned int: htobe32,       \
+                 long: _htobel,               \
+                 unsigned long: _htobel,      \
+                 long long: htobe64,          \
+                 unsigned long long: htobe64  \
+                 )(X)
+
+#define betoh(X) _Generic((X),                \
+                 short: be16toh,              \
+                 unsigned short: be16toh,     \
+                 int: be32toh,                \
+                 unsigned int: be32toh,       \
+                 long: _beltoh,               \
+                 unsigned long: _beltoh,      \
+                 long long: be64toh,          \
+                 unsigned long long: be64toh  \
+                 )(X)
+
+#define htole(X) _Generic((X),                \
+                 short: htole16,              \
+                 unsigned short: htole16,     \
+                 int: htole32,                \
+                 unsigned int: htole32,       \
+                 long: _htolel,               \
+                 unsigned long: _htolel,      \
+                 long long: htole64,          \
+                 unsigned long long: htole64  \
+                 )(X)
+
+#define letoh(X) _Generic((X),                \
+                 short: le16toh,              \
+                 unsigned short: le16toh,     \
+                 int: le32toh,                \
+                 unsigned int: le32toh,       \
+                 long: _leltoh,               \
+                 unsigned long: _leltoh,      \
+                 long long: le64toh,          \
+                 unsigned long long: le64toh  \
+                 )(X)
-- 
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