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@@ -9,10 +9,9 @@ SYS_READ equ 0x3
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;struct timespec contains seconds as time_t (integer unixtimestamp?) and nanoseconds as long
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section .bss
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+ ;timer filedescriptor
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tfd RESB 4
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- tst RESB 8
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- tsr RESB 4
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- lt RESB 1
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+ ;target memory for sys_timerfd_gettime
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ot RESB 16
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;timer struct interval
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itimer RESQ 2
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@@ -31,8 +30,6 @@ section .text
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_start:
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- mov [lt], byte 0x0
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-
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;prepeare sys_timerfd_create
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mov eax, SYS_TIMERFD_CREATE
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mov ebx, 1
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@@ -43,12 +40,12 @@ _start:
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mov [tfd], eax
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;init timer
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- ;interval
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- mov [itimer], dword 0x05
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- mov [itimer + 4], dword 0x00
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- ;value
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- mov [itimer + 8], dword 0x05
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- mov [itimer + 12], dword 0x0
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+ ;interval used for timer triggers
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+ mov [itimer], dword 0x05 ;sec
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+ mov [itimer + 4], dword 0x00 ;nanosecs
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+ ;value - initial value must bes set to arm timer
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+ mov [itimer + 8], dword 0x05 ;secs
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+ mov [itimer + 12], dword 0x0 ;nanosecs
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;settime sys_timerfd_settime
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mov eax, SYS_TIMERFD_SETTIME
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@@ -58,19 +55,12 @@ _start:
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mov esi, 0
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int 0x80
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- ;mov eax, 3
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- ;mov ebx, [tfd]
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- ;mov ecx, lt
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- ;mov edx, 1
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- ;int 0x80
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-
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- ;jmp exit
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poll:
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- ;get time
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+ ;get time from fd
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+ ;not used just for debugging with strace
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mov eax, SYS_TIMERFD_GETTIME
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mov ebx, [tfd]
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- ;mov ecx, tst
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mov ecx, ot
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int 0x80
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@@ -81,19 +71,11 @@ poll:
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mov edx, 0x20
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int 0x80
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- ;mov bx, [ot+13]
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- ;sub bx, [lt]
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- ;cmp bx, tick
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- ;jg poll
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-
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- ;mov [lt], bx
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-
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+ ;print "tick"
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mov eax, 4
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mov ebx, 1
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mov ecx, msg
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- ;mov ecx, ot
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mov edx, msgl
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- ;mov edx, 16
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int 0x80
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jmp poll
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