From 5481848e27fdd4fc859def9841a0283665531a46 Mon Sep 17 00:00:00 2001
From: Benji Dial <benji6283@gmail.com>
Date: Sun, 13 Sep 2020 17:12:29 -0400
Subject: fixed some paging bugs, added fault handlers and new programs

---
 src/kernel/isrs.asm | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 71 insertions(+), 2 deletions(-)

(limited to 'src/kernel/isrs.asm')

diff --git a/src/kernel/isrs.asm b/src/kernel/isrs.asm
index 9a9600c..4f2d4e2 100644
--- a/src/kernel/isrs.asm
+++ b/src/kernel/isrs.asm
@@ -6,6 +6,14 @@ global yield_isr
 global _start_user_mode
 global kbd_isr
 
+global udf_isr
+global dfa_isr
+global tsf_isr
+global npf_isr
+global ssf_isr
+global gpf_isr
+global pff_isr
+
 extern syscall_table
 extern active_task
 
@@ -13,14 +21,26 @@ extern delete_task
 extern advance_active_task
 extern on_kbd_isr
 extern make_sure_tasks
+extern exception_halt
 
 n_syscalls equ 0x9
 
+;section .bss
+;_debug_is_start_task resb 1
+;extern switch_to_kernel_cr3
+;extern switch_to_task_cr3
+
 section .text
 syscall_isr:
   cmp eax, n_syscalls
   jge .bad
 
+;  mov byte [_debug_is_start_task], 0
+;  cmp eax, 0x4
+;  jne .dont_set_debug
+;  mov byte [_debug_is_start_task], 1
+;.dont_set_debug:
+
   mov eax, dword [syscall_table + eax * 4]
 
   push edi
@@ -33,6 +53,16 @@ syscall_isr:
 
   add esp, 20
 
+;  cmp byte [_debug_is_start_task], 0
+;  je .dont_do_debug
+;  push eax
+;  call switch_to_kernel_cr3
+;  jmp $
+;  call switch_to_task_cr3
+;  pop eax
+;.dont_do_debug:
+
+._before_return:
   iret
 
 .bad:
@@ -86,12 +116,13 @@ yield_isr:
   mov edi, dword [eax + 24]
   mov ebp, dword [eax + 28]
 
-_before_start_task:
+._before_return:
   iret
 
 _start_user_mode:
   mov ax, 0x2b
   mov ds, ax
+  mov es, ax
 
   push dword 0x2b
   sub esp, 4
@@ -113,4 +144,42 @@ kbd_isr:
   pop edx
   pop ecx
   pop eax
-  iret
\ No newline at end of file
+  iret
+
+udf_isr:
+  push 0
+  push udid
+  call exception_halt
+
+dfa_isr:
+  push dfid
+  call exception_halt
+
+tsf_isr:
+  push tsid
+  call exception_halt
+
+npf_isr:
+  push npid
+  call exception_halt
+
+ssf_isr:
+  push ssid
+  call exception_halt
+
+gpf_isr:
+  push gpid
+  call exception_halt
+
+pff_isr:
+  push pfid
+  call exception_halt
+
+section .rodata
+udid db "UD", 0
+dfid db "DF", 0
+tsid db "TS", 0
+npid db "NP", 0
+ssid db "SS", 0
+gpid db "GP", 0
+pfid db "PF", 0
\ No newline at end of file
-- 
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