Userspace dlmalloc port, supporting syscalls mman_map()/mman_unmap()

ulib/system/system.c

@@ -18,3 +18,11 @@ int32_t processctl(uint64_t pid, uint64_t cmd, uint64_t arg1) {
 int32_t ipcpipe(uint64_t pid, uint64_t pipenum, uint64_t cmd, uint8_t *buffer, size_t len) {
   return syscall(SYS_IPCPIPE, pid, pipenum, cmd, (uint64_t)buffer, (uint64_t)len, 0);
 }
+
+int32_t mman_map(uint8_t *addr, size_t size, uint64_t prot, uint64_t flags, uint8_t **out) {
+  return syscall(SYS_MMAN_MAP, (uint64_t)addr, (uint64_t)size, prot, flags, (uint64_t)out, 0);
+}
+
+int32_t mman_unmap(uint8_t *addr) {
+  return syscall(SYS_MMAN_UNMAP, (uint64_t)addr, 0, 0, 0, 0, 0);
+}