usr: libc: Add machdep headers

Signed-off-by: Ian Moffett <ian@osmora.org>

3 files changed, 113 insertions, 2 deletions

diff --git a/.gitignore b/.gitignore
index 95180ea..001bc03 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,5 +11,6 @@
 /stand
 /base
 /sys/include/machine
+/lib/libc/include/machine/
 /share/misc/hwdoc
 autom4te.cache
diff --git a/lib/libc/Makefile b/lib/libc/Makefile
index c750d34..43c823e 100644
--- a/lib/libc/Makefile
+++ b/lib/libc/Makefile
@@ -5,7 +5,7 @@ LIBC_ASMFILES = $(shell find src/ -name "*.S")
 LIBC_OBJ = $(LIBC_CFILES:.c=.o)
 LIBC_ASMOBJ = $(LIBC_ASMFILES:.S=.S.o)
 
-all: headers $(LIBC_ASMOBJ) $(LIBC_OBJ) build/libc.a
+all: sys/include/machine headers $(LIBC_ASMOBJ) $(LIBC_OBJ) build/libc.a
 
 build/libc.a: build/
 	ar rcs build/libc.a $(LIBC_OBJ) $(LIBC_ASMOBJ)
@@ -16,8 +16,12 @@ build/libc.a: build/
 %.S.o: %.S
 	$(CC) $(CFLAGS) -Iinclude/ $< -o $@
 
+sys/include/machine:
+	mkdir -p include/machine/
+	cp include/arch/$(ARCH)/*.h include/machine/
+
 .PHONY: headers
-headers:
+headers: sys/include/machine
 	mkdir -p include/sys/
 	cp -f $(USRDIR)/include/sys/*.h include/sys
 	cp -f include/*.h $(USRDIR)/include/
@@ -31,4 +35,5 @@ build/:
 .PHONY: clean
 clean:
 	rm -f $(LIBC_OBJ) $(LIBC_ASMOBJ)
+	rm -rf include/machine/
 	rm -rf build/
diff --git a/lib/libc/include/arch/amd64/syscall.h b/lib/libc/include/arch/amd64/syscall.h
new file mode 100644
index 0000000..cc401e9
--- /dev/null
+++ b/lib/libc/include/arch/amd64/syscall.h
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _MACHINE_SYSCALL_H_
+#define _MACHINE_SYSCALL_H_
+
+#if !defined(__ASSEMBLER__)
+__always_inline static inline long
+syscall0(uint64_t code)
+{
+    volatile long ret;
+    __ASMV("int $0x80" : "=a"(ret) : "a"(code));
+    return ret;
+}
+
+__always_inline static inline long
+syscall1(uint64_t code, uint64_t arg0)
+{
+    volatile long ret;
+    __ASMV("int $0x80" : "=a"(ret) : "a"(code), "D"(arg0) : "memory");
+    return ret;
+}
+
+__always_inline static long inline
+syscall2(uint64_t code, uint64_t arg0, uint64_t arg1)
+{
+    volatile long ret;
+    __ASMV("int $0x80" : "=a"(ret) : "a"(code), "D"(arg0), "S"(arg1) : "memory");
+    return ret;
+}
+
+__always_inline static inline long
+syscall3(uint64_t code, uint64_t arg0, uint64_t arg1, uint64_t arg2)
+{
+    volatile long ret;
+    __ASMV("int $0x80" : "=a"(ret) : "a"(code), "D"(arg0), "S"(arg1), "d"(arg2) : "memory");
+    return ret;
+}
+
+__always_inline static inline long
+syscall4(uint64_t code, uint64_t arg0, uint64_t arg1, uint64_t arg2, uint64_t arg3)
+{
+    volatile long ret;
+    register uint64_t _arg3 asm("r10") = arg3;
+    __ASMV("int $0x80" : "=a"(ret) : "a"(code), "D"(arg0), "S"(arg1), "d"(arg2), "r"(_arg3) : "memory");
+    return ret;
+}
+
+__always_inline static inline long
+syscall5(uint64_t code, uint64_t arg0, uint64_t arg1, uint64_t arg2, uint64_t arg3, uint64_t arg4)
+{
+    volatile long ret;
+    register uint64_t _arg3 asm("r10") = arg3;
+    register uint64_t _arg4 asm("r9") = arg4;
+    __ASMV("int $0x80" : "=a"(ret) : "a"(code), "D"(arg0), "S"(arg1), "d"(arg2), "r"(_arg3), "r"(_arg4) : "memory");
+    return ret;
+}
+
+__always_inline static inline long
+syscall6(uint64_t code, uint64_t arg0, uint64_t arg1, uint64_t arg2, uint64_t arg3, uint64_t arg4, uint64_t arg5)
+{
+    volatile long ret;
+    register uint64_t _arg3 asm("r10") = arg3;
+    register uint64_t _arg4 asm("r9") = arg4;
+    register uint64_t _arg5 asm("r8") = arg5;
+    __ASMV("int $0x80" : "=a"(ret) : "a"(code), "D"(arg0), "S"(arg1), "d"(arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5) : "memory");
+    return ret;
+}
+
+#define _SYSCALL_N(a0, a1, a2, a3, a4, a5, a6, name, ...) \
+    name
+
+#define syscall(...) \
+_SYSCALL_N(__VA_ARGS__, syscall6, syscall5, \
+            syscall4, syscall3, syscall2, syscall1, \
+            syscall0)(__VA_ARGS__)
+
+#endif  /* !__ASSEMBLER__ */
+#endif  /* !_MACHINE_SYSCALL_H_ */