Kernel/x86_64 - Debugging iret->CPL3 crash

[tpg/acess2.git] / Kernel / arch / x86_64 / desctab.asm

diff --git a/Kernel/arch/x86_64/desctab.asm b/Kernel/arch/x86_64/desctab.asm
index 50fc126..739b219 100644 (file)
--- a/Kernel/arch/x86_64/desctab.asm
+++ b/Kernel/arch/x86_64/desctab.asm
@@ -191,6 +191,8 @@ IRQ_AddHandler:
 [section .rodata]
 csIRQ_Assigned:
        db      "IRQ %p := %p (IRQ %i)",0
+csIRQ_Fired:
+       db      "IRQ %i fired",0
 [section .text]
 
 %macro ISR_NOERRNO     1
@@ -277,10 +279,14 @@ IrqCommon:
        PUSH_GPR
        push gs
        push fs
+
+;      mov rdi, csIRQ_Fired
+;      mov rsi, [rsp+(16+2)*8]
+;      call Log
        
-       mov rbx, [rsp+(16+2)*8] ; Get interrupt number (16 GPRS + 2 SRs)
+       mov ebx, [rsp+(16+2)*8] ; Get interrupt number (16 GPRS + 2 SRs)
 ;      xchg bx, bx     ; Bochs Magic break (NOTE: will clear the high-bits of RBX)
-       shl rbx, 2      ; *8*4
+       shl ebx, 2      ; *4
        mov rax, gaIRQ_Handlers
        lea rbx, [rax+rbx*8]
        
@@ -303,20 +309,17 @@ IrqCommon:
        
        ; ACK
        mov al, 0x20
-       mov rdi, [rsp+16*8]     ; Get IRQ number
+       mov rdi, [rsp+(16+2)*8] ; Get IRQ number
        cmp rdi, 8
        jb .skipAckSecondary
-       mov dx, 0x00A0
-       out dx, al
+       out 0xA0, al
 .skipAckSecondary:
-       mov dx, 0x0020
-       out dx, al
+       out 0x20, al
        
        pop fs
        pop gs
        POP_GPR
        add rsp, 8*2
-       ;xchg bx, bx
        iretq
 
 [extern Proc_Scheduler]
@@ -371,6 +374,7 @@ SchedulerIRQ:
        pop gs
        POP_GPR
        add rsp, 2*8    ; Dummy error code and IRQ num
+;      xchg bx, bx
        iretq
 
 [extern ci_offsetof_tThread_KernelStack]
@@ -413,6 +417,10 @@ SyscallStub:
        pop r11
        pop rcx
        pop rsp         ; Change back to user stack
+       ; TODO: Determine if user is 64 or 32 bit
+
+;      xchg bx, bx     
+       db 0x48 ; REX, nasm doesn't have a sysretq opcode
        sysret
 
 [section .data]