1 files changed, 45 insertions, 0 deletions
diff --git a/src/user/runtimes/c/pcrt.asm b/src/user/runtimes/c/pcrt.asm
new file mode 100644
index 0000000..85c898c
--- /dev/null
+++ b/src/user/runtimes/c/pcrt.asm
@@ -0,0 +1,45 @@
+bits 32
+
+global __pcrt_entry
+global __pcrt_quit
+global calling_task
+global stdio_task
+
+extern main
+extern __pcrt_before_main_start
+extern __pcrt_before_main_end
+extern __pcrt_before_quit_start
+extern __pcrt_before_quit_end
+
+section .text
+__pcrt_entry:
+  mov dword [calling_task], esi
+  mov dword [stdio_task], edi
+  push edx
+
+  mov ebx, __pcrt_before_main_start
+.before_main_loop:
+  cmp ebx, __pcrt_before_main_end
+  je .call_main
+  call dword [ebx]
+  add ebx, 4
+  jmp .before_main_loop
+
+.call_main:
+  call main
+
+__pcrt_quit:
+  mov ebx, __pcrt_before_quit_start
+.before_quit_loop:
+  cmp ebx, __pcrt_before_quit_end
+  je .end_task
+  call dword [ebx]
+  add ebx, 4
+  jmp .before_quit_loop
+
+.end_task:
+  int 0x38
+
+section .bss
+calling_task resd 1
+stdio_task resd 1
+\ No newline at end of file