feat: add registers cleaning and stack saving

README.md

@@ -113,8 +113,8 @@ qemu-system-i386 -cdrom gratos.x86.grub.iso
     - [x] try to implement `memory dumping` and `debug` in the last "mini-shell" subject
 - [ ] KFS-4 (gratOS:0.4.0):
   - [ ] Mandatory:
-    - [ ] Registers cleaning
-    - [ ] Stack saving
+    - [x] Registers cleaning
+    - [x] Stack saving
     - [x] Hardware Interrupts
     - [ ] Software Interrupts
     - [x] A Interrupts Descriptor Table

src/driver/shell/mod.rs

@@ -1,4 +1,4 @@
-mod debug;
+pub mod debug;
 mod hexdump;
 
 use super::console::{self, NUMBER_OF_REGULAR_TTY};

src/main.rs

@@ -17,9 +17,10 @@ use crate::{
     driver::{
         console::{self, FG_RED, FG_RESET, RESET},
         keyboard::ps2::KEYBOARD,
-        pic, shell,
+        pic,
+        shell::{self, debug::print_stack},
     },
-    power::halt,
+    power::{clean_registers::clean_registers, halt},
 };
 use core::{
     arch::{asm, global_asm},
@@ -30,7 +31,11 @@ use core::{
 fn panic(info: &PanicInfo) -> ! {
     println!("{RESET}{FG_RED}");
     println!("{info}");
+    print_stack(128);
     print!("{FG_RESET}");
+    unsafe {
+        clean_registers();
+    }
     halt::halt();
 }
 

src/power/clean_registers.rs

@@ -0,0 +1,16 @@
+use core::arch::asm;
+
+pub unsafe fn clean_registers() {
+    unsafe {
+        asm!(
+            "xor eax, eax",
+            "xor ebx, ebx",
+            "xor ecx, ecx",
+            "xor edx, edx",
+            "xor esi, esi",
+            "xor edi, edi",
+            "xor ebp, ebp",
+            options(nomem, nostack, preserves_flags)
+        );
+    }
+}

src/power/mod.rs

@@ -1,3 +1,4 @@
+pub mod clean_registers;
 pub mod halt;
 pub mod reboot;
 pub mod shutdown;