From bce944d1498eaa3b6940ee234c863b3548a66b37 Mon Sep 17 00:00:00 2001
From: Benji Dial <benji6283@gmail.com>
Date: Sun, 24 Jan 2021 12:00:11 -0500
Subject: graphics!

---
 src/kernel/isrs.asm | 44 +++++++++++++++++++++++++++++++++++++-------
 1 file changed, 37 insertions(+), 7 deletions(-)

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

diff --git a/src/kernel/isrs.asm b/src/kernel/isrs.asm
index 472bb40..02b046d 100644
--- a/src/kernel/isrs.asm
+++ b/src/kernel/isrs.asm
@@ -22,8 +22,9 @@ extern advance_active_task
 extern on_kbd_isr
 extern make_sure_tasks
 extern exception_halt
+extern pf_check_stack
 
-n_syscalls equ 0x10
+n_syscalls equ 0x19
 
 ;section .bss
 ;_debug_is_start_task resb 1
@@ -149,30 +150,59 @@ kbd_isr:
 udf_isr:
   push 0
   push udid
-  call exception_halt
+  jmp exception
 
 dfa_isr:
   push dfid
-  call exception_halt
+  jmp exception
 
 tsf_isr:
   push tsid
-  call exception_halt
+  jmp exception
 
 npf_isr:
   push npid
-  call exception_halt
+  jmp exception
 
 ssf_isr:
   push ssid
-  call exception_halt
+  jmp exception
 
 gpf_isr:
   push gpid
-  call exception_halt
+  jmp exception
 
 pff_isr:
+  push eax
+  push ecx
+  push edx
+
+  mov eax, cr2
+  push eax
+  call pf_check_stack
+  add esp, 4
+
+  pop edx
+  pop ecx
+  test eax, eax
+  jz .not_stack
+
+  pop eax
+  add esp, 4
+  iret
+
+.not_stack:
+  pop eax
   push pfid
+  jmp exception
+
+exception:
+  push edi
+  push esi
+  push edx
+  push ecx
+  push ebx
+  push eax
   call exception_halt
 
 section .rodata
-- 
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