syscalls: make execve and vfs_read_file_by_path use follow_path, fix vfs_read_file_by_path name, fix execve-related pagefault

grubshit/caller.c

@@ -18,7 +18,7 @@ int main() {
     // The first argument is the path to the executable
     // The second is the array of arguments
     // The third is the array of environment variables
-    execve("callee.", argv, envp);
+    execve("/katau/callee.", argv, envp);
 
     // This part of the code will only be reached if execve fails
     perror("execve failed");

include/vfs.h

@@ -19,7 +19,7 @@ size_t vfs_read_file_length(l9660_file *file, uint8_t* buffer, size_t length);
 
 void test_iso9660();
 
-int vsf_read_file_by_path(const char* path, uint8_t** buffer, l9660_dir* dir);
+int vfs_read_file_by_path(const char* path, uint8_t** buffer);
 void follow_path(const char* path, l9660_file* file, l9660_dir* dir);
 
 #endif

src/fs/vfs.c

@@ -191,18 +191,14 @@ void test_iso9660()
     }
 }
 
-int vsf_read_file_by_path(const char* path, uint8_t** buffer, l9660_dir* dir)
+int vfs_read_file_by_path(const char* path, uint8_t** buffer)
 {
     l9660_file* file = (l9660_file*)malloc(sizeof(l9660_file));
+    l9660_dir* dir = (l9660_dir*)malloc(sizeof(l9660_dir));
 
     l9660_status err;
 
-    err = l9660_openat(file, dir, path);
-    if (err != L9660_OK)
-    {
-        debug_log("read_file: err: 0x%X\n", err);
-        return err;
-    }
+    follow_path(path, file, dir);
 
     debug_log("HEHE %s\n", path);
 
@@ -218,6 +214,7 @@ int vsf_read_file_by_path(const char* path, uint8_t** buffer, l9660_dir* dir)
 
     read = vfs_read_file(file, *buffer);
     free(file);
+    free(dir);
     debug_log("bytes read: 0x%X\n", read);
     
     return 0;

src/kernel/kernel.c

@@ -131,12 +131,12 @@ void kmain(unsigned int magic, unsigned int info)
 
 	mount_fs();
 
-	l9660_dir* dir = (l9660_dir*)malloc(sizeof(l9660_dir));
-	l9660_file* file = (l9660_file*)malloc(sizeof(l9660_file));
+	l9660_dir dir;
+	l9660_file file;
 
-	follow_path("/katau/core.", file, dir);
+	follow_path("/katau/caller.", &file, &dir);
 
-	exec_from_file(file, ".");
+	exec_from_file(&file, ".");
 
 	while(1)
 	{

src/tasking/syscalls.c

@@ -292,7 +292,7 @@ int sys_execve(TrapFrame *tf) {
     }
 
     uint8_t* file_buffer;
-    int err = vsf_read_file_by_path(filename, &file_buffer, root_dir);
+    int err = vfs_read_file_by_path(filename, &file_buffer);
     if (err != 0) {
         debug_log("execve: failed to read file '%s'\n", filename);
         return -1;