1 files changed, 102 insertions, 11 deletions
diff --git a/service/lib/posix.c b/service/lib/posix.c
index 9a3e70f..abc73bf 100644
--- a/service/lib/posix.c
+++ b/service/lib/posix.c
@@ -1,19 +1,110 @@
 #include <unistd.h>
+#include <sys/mman.h>
+#include <kjarna/syscall.h>
+#include <stdnoreturn.h>
 
-ssize_t write(int fd, const void *buffer, size_t length)
+__attribute__((always_inline))
+static inline int64_t syscall1(int syscall_index, uint64_t p1)
 {
-	ssize_t result;
+	int64_t result; 
+	__asm__ ( 
+		"movq %1, %%rax\n" 
+		"movq %2, %%rdi\n" 
+		"syscall\n" 
+		: "=a"(result) 
+		: "g"(syscall_index), "g"(p1)
+		: "rdi"); 
+	return result;
+}
 
-	__asm__ (
-		"movq %1, %%rdi\n"
-		"movq %2, %%rsi\n"
-		"movq %3, %%rdx\n"
-		"movq %0, %%rax\n"
-		"syscall"
-		: "=a"(result)
-		: "g"(fd), "g"(buffer), "g"(length)
-		: "rdi", "rsi","rdx");
+__attribute__((always_inline))
+static inline int64_t syscall2(int syscall_index, uint64_t p1, uint64_t p2)
+{
+	int64_t result; 
+	__asm__ ( 
+		"movq %1, %%rax\n" 
+		"movq %2, %%rdi\n" 
+		"movq %3, %%rsi\n" 
+		"syscall\n" 
+		: "=a"(result) 
+		: "g"(syscall_index), "g"(p1), "g"(p2)
+		: "rdi", "rsi"); 
+	return result;
+}
+
+__attribute__((always_inline))
+static inline int64_t syscall3(int syscall_index, uint64_t p1, uint64_t p2, uint64_t p3)
+{
+	int64_t result; 
+	__asm__ ( 
+		"movq %1, %%rax\n" 
+		"movq %2, %%rdi\n" 
+		"movq %3, %%rsi\n" 
+		"movq %4, %%rdx\n" 
+		"syscall\n" 
+		: "=a"(result) 
+		: "g"(syscall_index), "g"(p1), "g"(p2), "g"(p3)
+		: "rdi", "rsi","rdx"); 
+	return result;
+}
 
+__attribute__((always_inline))
+static inline int64_t syscall6(int syscall_index, uint64_t p1, uint64_t p2, uint64_t p3, uint64_t p4, uint64_t p5, uint64_t p6)
+{
+	int64_t result; 
+	__asm__ ( 
+		"movq %1, %%rax\n" 
+		"movq %2, %%rdi\n" 
+		"movq %3, %%rsi\n" 
+		"movq %4, %%rdx\n" 
+		"movq %5, %%r10\n" 
+		"movq %6, %%r8\n" 
+		"movq %7, %%r9\n" 
+		"syscall\n" 
+		: "=a"(result) 
+		: "g"(syscall_index), "g"(p1), "g"(p2), "g"(p3), "g"(p4), "g"(p5), "g"(p6)
+		: "rdi", "rsi","rdx", "r10", "r8", "r9"); 
 	return result;
 }
 
+int open(const char *path, int flags, int mode)
+{
+	return (int)syscall3(SYS_OPEN, (uintptr_t)path, flags, mode);
+}
+
+int close(int fd)
+{
+	return (int)syscall1(SYS_CLOSE, fd);
+}
+
+off_t lseek(int fd, off_t offset, int whence)
+{
+	return syscall3(SYS_LSEEK, fd, offset, whence);
+}
+
+ssize_t read(int fd, void *buffer, size_t length)
+{
+	return syscall3(SYS_READ, fd, (uintptr_t)buffer, length);
+}
+
+ssize_t write(int fd, const void *buffer, size_t length)
+{
+	return syscall3(SYS_WRITE, fd, (uintptr_t)buffer, length);
+}
+
+void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
+{
+	return (void *)syscall6(SYS_MMAP, (uintptr_t)addr, length, prot, flags, fd, offset);
+}
+
+int munmap(void *addr, size_t length)
+{
+	return syscall2(SYS_MUNMAP, (uintptr_t)addr, length);
+}
+
+noreturn void _exit(int status)
+{
+	syscall1(SYS_EXIT, status);
+	while(true);
+}
+