Updated syscall.h

libc/include/syscall.h

@@ -17,12 +17,33 @@ typedef enum {
     SYS_SLEEP,
 } SYSCALL_NUMBERS;
 
-int syscall(int nr, int arg0, int arg1, int arg2);
+inline int syscall(int nr, int a0, int a1, int a2, int a3, int a4) {
+    int ret;
+    __asm__ volatile (
+        "movl %1, %%eax\n"  // Syscall number
+        "movl %2, %%ebx\n"  // Arg 0
+        "movl %3, %%ecx\n"  // Arg 1
+        "movl %4, %%edx\n"  // Arg 2
+        "movl %5, %%esi\n"  // Arg 3
+        "movl %6, %%edi\n"  // Arg 4
+        "int $0x80\n"       // Trigger syscall
+        "movl %%eax, %0"    // Return
+        : "=r"(ret)         // Output
+        : "r"(nr), "r"(a0), "r"(a1), "r"(a2), "r"(a3), "r"(a4)  // Input
+        : "eax", "ebx", "ecx", "edx", "esi", "edi"  // Clobbered regs
+    );
+    return ret;
+}
 
 /* Syscall wrappers */
-int read(int fd, void* ptr, size_t count);
-int write(int fd, const void* ptr, size_t count);
-int open(const char* path, int oflag);
-int close(int fd);
+inline int _exit(int status) { return syscall(SYS_EXIT, status, 0, 0, 0, 0); }
+inline int read(int fd, void* ptr, size_t count) { return syscall(SYS_READ, fd, (int)ptr, (int)count, 0, 0); }
+inline int write(int fd, const void* ptr, size_t count) { return syscall(SYS_WRITE, fd, (int)ptr, (int)count, 0, 0); }
+inline int open(const char* path, int oflag) { return syscall(SYS_OPEN, (int)path, oflag, 0, 0); }
+inline int close(int fd) { return syscall(SYS_CLOSE, fd, 0, 0, 0, 0); }
+inline int seek(int fd, size_t offset, int whence) { return syscall(SYS_SEEK, fd, offset, whence); }
+inline int _malloc(int size) { return syscall(SYS_MALLOC, size, 0, 0, 0, 0); }
+inline int _free(void* ptr) { return syscall(SYS_FREE, (int)ptr, 0, 0, 0, 0); }
+inline int _sleep(int t) { return syscall(SYS_SLEEP, t, 0, 0, 0, 0); }
 
 #endif

libc/syscall/syscall.c

@@ -1,32 +0,0 @@
-#include <syscall.h>
-#include <stddef.h>
-
-#define MAX_SYSCALLS 9
-
-int syscall(int nr, int arg0, int arg1, int arg2) {
-    int ret = 0;
-    __asm__ volatile ("int $0x80" : "=a"(ret) : "a"(nr), "b"(arg0), "c"(arg1), "d"(arg2));
-    return ret;
-}
-
-/* Syscall wrappers */
-int read(int fd, void* ptr, size_t count) {
-    // Returns: int fd
-    return syscall(SYS_READ, fd, (int)ptr, count);
-}
-
-int write(int fd, const void* ptr, size_t count) {
-    // Returns: int count
-    return syscall(SYS_WRITE, fd, (int)ptr, count);
-}
-
-int open(const char* path, int oflag) {
-    // Returns: int fd
-    return syscall(SYS_OPEN, (int)path, oflag, 0);
-}
-
-int close(int fd) {
-    // Returns: int status
-    return syscall(SYS_CLOSE, fd, 0, 0);
-}
-

todo.txt

@@ -36,7 +36,8 @@ Legend:
     - [ ] complex.h (idk why we would need this)
     - [x] ctype.h
     - [x] errno.h
-    - [ ] float.h
+    - [x] fcntl.h
+    - [x] float.h
     - [x] limits.h
     - [x] math.h (maybe a separate libm?) TODO: add errno errors in there
     - [x] setjmp.h (this plagues my mind)
@@ -45,11 +46,11 @@ Legend:
     - [x] stdbool.h
     - [x] stddef.h
     - [x] stdint.h
-    - [ ] stdio.h
-    - [ ] stdlib.h
+    - [x] stdio.h
+    - [x] stdlib.h
     - [x] string.h
     - [x] syscall.h
-    - [ ] time.h
+    - [x] time.h
     - [ ] unistd.h (do we do POSIX?)
     - [ ] wchar.h (we would need text support for wide chars ig?)
     - [ ] wctype.h (same as above)
@@ -67,7 +68,7 @@ Legend:
     - [x] ports - handles IO ports (eg. serial console)
     - [x] screen - everything that displays on the screen
     - [x] sound - handles everything related to sound
-    - [ ] syscall - system calls
+    - [x] syscall - system calls
     - [x] tty - handles terminal output 
 
 - [x] Multistage Bootloader