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I have finally found why mtdbg sometimes seems to lose control over the debugged program!

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r3675 has broken single-stepping and everything that depends on it.
And, of course, commit message for r3675 has nothing to do with changes in r3675.

git-svn-id: svn://kolibrios.org@4443 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
CleverMouse 2014-01-13 11:13:05 +00:00
parent 85b2b4bfbe
commit 9820d9190e
1 changed files with 22 additions and 25 deletions
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47
programs/develop/mtdbg/mtdbg.asm
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@ -882,24 +882,30 @@ CtrlF8:
; Step execution event
;Here we get [<number>] argument at do step <number> times
OnStep:
OnStepMultiple:
cmp [bSuspended], 0
jz .running
cmp [step_num], 0
jg .stepone
jz OnStep.running
mov [step_num], 1
mov esi, [curarg]
cmp esi, 0
jz .stepone
test esi, esi
jz .do
cmp byte [esi], 0
jz .stepone
jz .do
call get_hex_number
jc .ret
cmp eax, 0 ; check if lesser or equal than 0
jle .ret
mov [step_num], eax
mov [curarg], 0
.do:
call OnStep
dec [step_num]
jnz .do
.ret:
ret
.stepone:
OnStep:
cmp [bSuspended], 0
jz .running
call get_context
or byte [_eflags+1], 1 ; set TF
call set_context
@ -941,15 +947,6 @@ OnStep:
mov [bAfterGo], 2
@@:
mov eax, [step_num]
dec eax
cmp eax, 0
jle .ret
mov [step_num], eax
jmp .stepone
.ret:
mov [step_num], 0
ret
; return address is [ebp-4]
@ -1018,7 +1015,7 @@ OnProceed:
@@:
call get_byte_nobreak
jc OnStep.stepone
jc OnStep
inc esi
; skip prefixes
call is_prefix
@ -1054,14 +1051,14 @@ OnProceed:
; FF /2 = call
.noloop:
cmp al, 0xFF
jnz OnStep.stepone
jnz OnStep
call get_byte_nobreak
jc OnStep.stepone
jc OnStep
inc esi
mov cl, al
and al, 00111000b
cmp al, 00010000b
jnz OnStep.stepone
jnz OnStep
; skip instruction
mov al, cl
and eax, 7
@ -1085,7 +1082,7 @@ OnProceed:
cmp al, 4
jnz @f
call get_byte_nobreak
jc OnStep.stepone
jc OnStep
inc esi
and al, 7
@ -1097,7 +1094,7 @@ OnProceed:
.doit:
; insert one-shot breakpoint at esi and resume
call get_byte_nobreak
jc OnStep.stepone
jc OnStep
mov eax, esi
call find_enabled_breakpoint
jz @f
@ -2401,7 +2398,7 @@ commands:
db 9
dd aResume, OnResume, ResumeSyntax, ResumeHelp
db 0Bh
dd aStep, OnStep, StepSyntax, StepHelp
dd aStep, OnStepMultiple, StepSyntax, StepHelp
db 0Bh
dd aProceed, OnProceed, ProceedSyntax, ProceedHelp
db 0Bh