Debug subsystem: added DRx registers support
git-svn-id: svn://kolibrios.org@66 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Evgeny Grechnikov (Diamond)
parent
9b016cea47
commit
aa7be4e6f1
@ -1,14 +1,6 @@
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; this code uses following additions to system structures:
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; in additional app info at 80000..8FFFF:
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; AC (dword) 0 or debugger slot
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; BC (dword) address of debug event memory
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; new process slot state:
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; 1 = suspended
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; 2 = suspended waiting for event
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; new event: 8 (and new possible bitflag for A8 in additional app info)
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; diamond, 2006
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sys_debug_services:
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cmp eax, 8
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cmp eax, 9
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ja @f
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jmp dword [sys_debug_services_table+eax*4]
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@@: ret
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@ -22,6 +14,7 @@ sys_debug_services_table:
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dd debug_read_process_memory
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dd debug_write_process_memory
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dd debug_terminate
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dd debug_set_drx
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debug_set_event_data:
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; in: ebx = pointer
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@ -230,6 +223,77 @@ debug_setcontext:
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.ret:
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ret
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debug_set_drx:
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call get_debuggee_slot
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jc .errret
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mov ebp, eax
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lea eax, [eax*8+0x80000+0xC0]
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; [eax]=dr0, [eax+4]=dr1, [eax+8]=dr2, [eax+C]=dr3
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; [eax+10]=dr7
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add edx, std_application_base_address
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jc .errret
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cmp cl, 3
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ja .errret
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mov ebx, dr7
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shr ebx, cl
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shr ebx, cl
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test ebx, 2 ; bit 1+2*index = G0..G3, global break enable
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jnz .errret2
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test ch, ch
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jns .new
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; clear breakpoint
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movzx ecx, cl
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add ecx, ecx
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and dword [eax+ecx*2], 0 ; clear DR<i>
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btr dword [eax+10h], ecx ; clear L<i> bit
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test byte [eax+10h], 55h
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jnz .okret
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imul eax, ebp, tss_step/32
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and byte [eax + tss_data + l.trap - tss_sceleton], not 1
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.okret:
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and dword [esp+36], 0
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sti
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ret
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.errret:
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sti
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mov dword [esp+36], 1
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ret
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.errret2:
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sti
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mov dword [esp+36], 2
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ret
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.new:
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; add new breakpoint
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; cl=index; ch=flags; edx=address
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test ch, 0xF0
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jnz .errret
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mov bl, ch
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and bl, 3
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cmp bl, 2
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jz .errret
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mov bl, ch
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shr bl, 2
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cmp bl, 2
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jz .errret
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test dl, bl
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jnz .errret
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or byte [eax+10h+1], 3 ; set GE and LE flags
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movzx ebx, ch
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movzx ecx, cl
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add ecx, ecx
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bts dword [eax+10h], ecx ; set L<i> flag
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add ecx, ecx
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mov [eax+ecx], edx ; set DR<i>
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shl ebx, cl
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mov edx, 0xF
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shl edx, cl
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not edx
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and [eax+10h+2], dx
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or [eax+10h+2], bx ; set R/W and LEN fields
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imul eax, ebp, tss_step/32
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or byte [eax + tss_data + l.trap - tss_sceleton], 1
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jmp .okret
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debug_read_process_memory:
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; in:
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; ebx=pid
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@ -288,11 +352,12 @@ debugger_notify:
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; interrupts must be disabled!
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; destroys all general registers
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; interrupts remain disabled
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mov ebp, eax
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shl eax, 8
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xchg ebp, eax
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mov edi, [timer_ticks]
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add edi, 500 ; 5 sec timeout
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.1:
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mov eax, ebp
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shl eax, 8
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mov edx, [0x80000+eax+0xBC]
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test edx, edx
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jz .ret
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@ -315,8 +380,11 @@ debugger_notify:
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pop ecx
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pop ecx
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pop ecx
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cmp dword [0x3000], 1
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jnz .notos
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cmp [timer_ticks], edi
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jae .ret
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.notos:
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sti
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call change_task
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cli
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@ -349,3 +417,82 @@ debugger_notify:
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or byte [0x80000+eax+0xA8+1], 1 ; set flag 100h
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.ret:
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ret
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debug_exc:
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; int 1 = #DB
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save_ring3_context
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mov ax, os_data
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mov ds, ax
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mov es, ax
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mov eax, dr6
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test ax, ax
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jns @f
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; this is exception from task switch
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; set DRx registers for task and continue
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mov eax, [0x3000]
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shl eax, 8
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add eax, 0x80000+0xC0
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mov ecx, [eax+0]
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mov dr0, ecx
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mov ecx, [eax+4]
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mov dr1, ecx
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mov ecx, [eax+8]
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mov dr2, ecx
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mov ecx, [eax+0Ch]
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mov dr3, ecx
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xor ecx, ecx
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mov dr6, ecx
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mov ecx, [eax+10h]
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mov dr7, ecx
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restore_ring3_context
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iretd
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@@:
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push eax
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xor eax, eax
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mov dr6, eax
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; test if debugging
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cli
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mov eax, [0x3000]
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shl eax, 8
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mov eax, [0x80000+eax+0xAC]
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test eax, eax
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jnz .debug
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sti
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; not debuggee => say error and terminate
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add esp, 28h+4
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mov [error_interrupt], 1
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call show_error_parameters
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mov edx, [0x3010]
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mov byte [edx+0xA], 4
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jmp change_task
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.debug:
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; we are debugged process, notify debugger and suspend ourself
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; eax=debugger PID
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pop edx
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mov ebx, dr7
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mov cl, not 1
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.l1:
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test bl, 1
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jnz @f
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and dl, cl
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@@:
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shr ebx, 2
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add cl, cl
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inc ecx
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cmp cl, not 10h
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jnz .l1
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push edx ; DR6 image
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mov ecx, [0x3010]
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push dword [ecx+4] ; PID
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push 12
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pop ecx
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push 3 ; 3 = debug exception
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call debugger_notify
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pop ecx
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pop ecx
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pop ecx
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mov edx, [0x3010]
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mov byte [edx+0xA], 1 ; suspended
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call change_task
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restore_ring3_context
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iretd
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@ -12,7 +12,7 @@ irq0:
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mov edi,[0x3000]
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shl edi, 3
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; fields of TSS descriptor:
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mov [edi+gdts+ tss0 +5], word 01010000b *256 +11101001b
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; mov [edi+gdts+ tss0 +5], word 01010000b *256 +11101001b
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inc dword [timer_ticks]
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@ -152,7 +152,7 @@ build_interrupt_table:
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iglobal
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sys_int:
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dd e0,e1,e2,e3,e4,e5,e6,e7,e8,e9,e10,e11,e12,e13,e14,e15
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dd e0,debug_exc,e2,e3,e4,e5,e6,e7,e8,e9,e10,e11,e12,e13,e14,e15
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dd e16,e17
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times 14 dd unknown_interrupt
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@ -42,7 +42,7 @@
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;
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; 20 dword application event mask
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; 24 dword PID - process identification number
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; 2a word 0, state 3=zombie, 4=terminate
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; 2a word 0, state 1,2=suspended 3=zombie, 4=terminate
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; 2e byte window number on screen
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; 30 dword exact position in memory
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; 34 dword counter sum
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@ -143,10 +143,12 @@
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; A0 dword IPC memory start
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; A4 dword IPC memory size
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; A8 dword event bits: mouse, stack,..
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;
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; AC dword 0 or debugger slot
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; B0 dword int40 handler in use ; 0 if not in use
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; B4 byte keyboard mode: 0 = keymap, 1 = scancodes
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; B8 dword physical address of directory table
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; BC dword address of debug event memory
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; C0 5 dd thread debug registers: DR0,DR1,DR2,DR3,DR7
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;
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; 90000 -> 9FFFF tmp
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; A0000 -> AFFFF screen access area
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