azan

commit 9ddea720055aba55b30a661e99fd344fbfcaa387
parent 333f337f86be12ea2b88becf6cc0c09185b59591
Author: afify <hassan@afify.dev>
Date:   Fri,  6 Nov 2020 14:03:54 +0300

[feat] print julian, create util.s

- use timestamp to julian:
	return ( unixsecs / 86400.0 ) + 2440587.5;
- move _printRAX to util.s

Diffstat:
M
Makefile
 | 
2
+-
M
azan-nasm.s
 | 
76
++++++++++++++++++++++++----------------------------------------------------
M
config.mk
 | 
2
+-
A
util.s
 | 
50
++++++++++++++++++++++++++++++++++++++++++++++++++

4 files changed, 76 insertions(+), 54 deletions(-)
diff --git a/Makefile b/Makefile
@@ -4,7 +4,7 @@
 include config.mk
 
 BIN = azan-nasm
-SRC = ${BIN}.s
+SRC = ${BIN}.s util.s
 OBJ = ${SRC:.s=.o}
 
 all: options ${BIN}
diff --git a/azan-nasm.s b/azan-nasm.s
@@ -8,61 +8,33 @@ BITS 64
 CHECK_OPENBSD
 
 section .bss
-	digitSpace: resb 100
-	digitSpacePos: resb 8
-	current_time: resb 12
+	timestamp: resb 12
+	julian: resb 12
+	equation_of_time: resb 12
+	res_char: resb 1
+	res_hour: resb 2
+	res_min: resb 2
+section .rodata
+	julian_1970: dq 0x41429ec5c0000000 ; double 2440587.5
+	sec_in_day: dq 0x40f5180000000000 ; double 86400
 
 section .text
 	global _start
+	extern _printRAX
 
 _start:
-	mov rax, SYS_gettimeofday
-	mov rdi, current_time
-	mov rsi, rsi
-	syscall
-
-	mov rax, [current_time]
-
-	call _printRAX
+; get_timestamp:
+	mov rax, SYS_gettimeofday ;sys_gettimeofday(
+	mov rdi, timestamp        ;struct timeval *tv,
+	mov rsi, rsi              ;struct timezone* tz
+	syscall                   ;)
+
+; calc_julian:
+	mov rax, [timestamp]   ; mov value of timestamp in rax
+	mov rbx, sec_in_day    ; rbx = SEC_IN_DAY
+	div rbx                ; timestamp / SEC_IN_DAY
+	add rax, 2440587
+	mov [julian], rax      ; save result of division in julian
+
+	call _printRAX ;util.s
 	EEXIT EXIT_SUCCESS
-
-_printRAX:
-	mov rcx, digitSpace
-	mov rbx, 10
-	mov [rcx], rbx
-	inc rcx
-	mov [digitSpacePos], rcx
-
-_printRAXLoop:
-	mov rdx, 0
-	mov rbx, 10
-	div rbx
-	push rax
-	add rdx, 48
-
-	mov rcx, [digitSpacePos]
-	mov [rcx], dl
-	inc rcx
-	mov [digitSpacePos], rcx
-	
-	pop rax
-	cmp rax, 0
-	jne _printRAXLoop
-
-_printRAXLoop2:
-	mov rcx, [digitSpacePos]
-
-	mov rax, SYS_write
-	mov rdi, 1
-	mov rsi, rcx
-	mov rdx, 1
-	syscall
-
-	mov rcx, [digitSpacePos]
-	dec rcx
-	mov [digitSpacePos], rcx
-
-	cmp rcx, digitSpace
-	jge _printRAXLoop2
-
-	ret
diff --git a/config.mk b/config.mk
@@ -9,7 +9,7 @@ MANPREFIX = ${PREFIX}/share/man
 
 # flags
 AFLAGS  = -f elf64 -w+all -D$$(uname)
-LFLAGS  = -m elf_x86_64 -no-pie
+LFLAGS  = -m elf_x86_64 -s -no-pie
 
 # compiler and linker
 ASM  = nasm
diff --git a/util.s b/util.s
@@ -0,0 +1,50 @@
+BITS 64
+%include "syscalls.s"
+%idefine rip rel $
+section .bss
+	digitSpace: resb 100
+	digitSpacePos: resb 8
+
+section .text
+	global _printRAX
+
+_printRAX:
+	mov rcx, digitSpace
+	mov rbx, 10
+	mov [rcx], rbx
+	inc rcx
+	mov [digitSpacePos], rcx
+
+_printRAXLoop:
+	mov rdx, 0
+	mov rbx, 10
+	div rbx
+	push rax
+	add rdx, 48
+
+	mov rcx, [digitSpacePos]
+	mov [rcx], dl
+	inc rcx
+	mov [digitSpacePos], rcx
+	
+	pop rax
+	cmp rax, 0
+	jne _printRAXLoop
+
+_printRAXLoop2:
+	mov rcx, [digitSpacePos]
+
+	mov rax, SYS_write
+	mov rdi, 1
+	mov rsi, rcx
+	mov rdx, 1
+	syscall
+
+	mov rcx, [digitSpacePos]
+	dec rcx
+	mov [digitSpacePos], rcx
+
+	cmp rcx, digitSpace
+	jge _printRAXLoop2
+
+	ret