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'stdio'에 해당되는 글 1건

2016.09.09 gcc hex, bin file size 줄이기

gcc hex, bin file size 줄이기

C언어,ARM / 2016. 9. 9. 23:30

임베디드용 프로그램은 컴파일된 코드사이즈가 작을 수 록 좋다.

보통 printf등의 함수를 사용하면, 수십kb 이상 파일크기가 증가한다.

약 68kbyte인 상태

=================
Generate binary file
Generate hex file
main.o  :
section               size         addr
.isr_vector            388    134217728
.text                67288    134218116
.eh_frame                4    134285404
.ARM                     8    134285408
.ARM.attributes         41            0
.init_array              8    134285416
.fini_array              4    134285424
.data                 1204    536870912
.jcr                     4    536872116
.fsmc_sram_data          0   1677721600
.fsmc_sram_bss           0   1677721600
.fsmc_sram_perma         0   1677721600
.bss                  2128    536872120
._user_heap_stack     1536    536874248
.factory_values          0    135264256
.debug_info         117485            0
.debug_abbrev         3591            0
.debug_loc          114940            0
.debug_aranges         176            0
.debug_ranges        21624            0
.debug_line          29503            0
.debug_str           20683            0
.comment               112            0
.debug_frame         14992            0
Total               395719
   text    data     bss     dec     hex filename
  67688    1220    3664   72572   11b7c main.o
 D 드라이브의 볼륨: D
 볼륨 일련 번호: 1473-2495
 D:\ARM\DP3000\DP3000 디렉터리
2016-09-09  오후 04:57            68,908 main.bin

printf함수대신, puts등을 여러번 사용하여 구현하기도 한다.

또는 %d, %s등만 구현이 되는 간단한 printf함수를 만들어 사용하기도 한다.

또한, printf, puts등에 사용된 문자열도 코드사이즈 증가에 한몫한다.

가는하면, 디버깅이 끝나면, 주석문으로 처리하는것이 좋다.

컴파일된 함수의 기계어 코드사이즈를 확인할 수 있는 방법

Usage: arm-none-eabi-objdump  
 Display information from object .
 At least one of the following switches must be given:
  -a, --archive-headers    Display archive header information
  -f, --file-headers       Display the contents of the overall file header
  -p, --private-headers    Display object format specific file header contents
  -P, --private=OPT,OPT... Display object format specific contents
  -h, --[section-]headers  Display the contents of the section headers
  -x, --all-headers        Display the contents of all headers
  -d, --disassemble        Display assembler contents of executable sections
  -D, --disassemble-all    Display assembler contents of all sections
  -S, --source             Intermix source code with disassembly
  -s, --full-contents      Display the full contents of all sections requested
  -g, --debugging          Display debug information in object file
  -e, --debugging-tags     Display debug information using ctags style
  -G, --stabs              Display (in raw form) any STABS info in the file
  -W[lLiaprmfFsoRt] or
  --dwarf[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,
          =frames-interp,=str,=loc,=Ranges,=pubtypes,
          =gdb_index,=trace_info,=trace_abbrev,=trace_aranges,
          =addr,=cu_index]
                           Display DWARF info in the file
  -t, --syms               Display the contents of the symbol table(s)
  -T, --dynamic-syms       Display the contents of the dynamic symbol table
  -r, --reloc              Display the relocation entries in the file
  -R, --dynamic-reloc      Display the dynamic relocation entries in the file
  @                  Read options from 
  -v, --version            Display this program's version number
  -i, --info               List object formats and architectures supported
  -H, --help               Display this information

arm-none-eabi-objdump -S -h -d main.o > ..\main.lst
Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .isr_vector   00000184  08000000  08000000  00008000  2**0
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  1 .text         000106d8  08000184  08000184  00008184  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
  2 .eh_frame     00000004  0801085c  0801085c  0001885c  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  3 .ARM          00000008  08010860  08010860  00018860  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  4 .ARM.attributes 00000029  00000000  00000000  000204b8  2**0
                  CONTENTS, READONLY
  5 .init_array   00000008  08010868  08010868  00018868  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  6 .fini_array   00000004  08010870  08010870  00018870  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  7 .data         000004b4  20000000  08010874  00020000  2**3
                  CONTENTS, ALLOC, LOAD, DATA
  8 .jcr          00000004  200004b4  08010d28  000204b4  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  9 .fsmc_sram_data 00000000  64000000  64000000  000204e1  2**0
                  CONTENTS
 10 .fsmc_sram_bss 00000000  64000000  64000000  000204e1  2**0
                  CONTENTS
 11 .fsmc_sram_perma 00000000  64000000  64000000  000204e1  2**0
                  CONTENTS
 12 .bss          00000850  200004b8  200004b4  000204b8  2**2
                  ALLOC
 13 ._user_heap_stack 00000600  20000d08  2001fa00  00020d08  2**0
                  ALLOC
 14 .factory_values 00000000  080ff800  080ff800  000204e1  2**0
                  CONTENTS
 15 .debug_info   0001caed  00000000  00000000  000204e1  2**0
                  CONTENTS, READONLY, DEBUGGING
 16 .debug_abbrev 00000e07  00000000  00000000  0003cfce  2**0
                  CONTENTS, READONLY, DEBUGGING
 17 .debug_loc    0001c0fc  00000000  00000000  0003ddd5  2**0
                  CONTENTS, READONLY, DEBUGGING
 18 .debug_aranges 000000b0  00000000  00000000  00059ed8  2**3
                  CONTENTS, READONLY, DEBUGGING
 19 .debug_ranges 00005478  00000000  00000000  00059f88  2**3
                  CONTENTS, READONLY, DEBUGGING
 20 .debug_line   0000733f  00000000  00000000  0005f400  2**0
                  CONTENTS, READONLY, DEBUGGING
 21 .debug_str    000050cb  00000000  00000000  0006673f  2**0
                  CONTENTS, READONLY, DEBUGGING
 22 .comment      00000070  00000000  00000000  0006b80a  2**0
                  CONTENTS, READONLY
 23 .debug_frame  00003a90  00000000  00000000  0006b87c  2**2
                  CONTENTS, READONLY, DEBUGGING

Disassembly of section .text:

08000184 <__do_global_dtors_aux>:
 8000184:	b510      	push	{r4, lr}
 8000186:	4c05      	ldr	r4, [pc, #20]	; (800019c <__do_global_dtors_aux+0x18>)
 8000188:	7823      	ldrb	r3, [r4, #0]
 800018a:	b933      	cbnz	r3, 800019a <__do_global_dtors_aux+0x16>
 800018c:	4b04      	ldr	r3, [pc, #16]	; (80001a0 <__do_global_dtors_aux+0x1c>)
 800018e:	b113      	cbz	r3, 8000196 <__do_global_dtors_aux+0x12>
 8000190:	4804      	ldr	r0, [pc, #16]	; (80001a4 <__do_global_dtors_aux+0x20>)
 8000192:	f3af 8000 	nop.w
 8000196:	2301      	movs	r3, #1
 8000198:	7023      	strb	r3, [r4, #0]
 800019a:	bd10      	pop	{r4, pc}
 800019c:	200004b8 	.word	0x200004b8
 80001a0:	00000000 	.word	0x00000000
 80001a4:	0801085c 	.word	0x0801085c

080001a8 <frame_dummy>:
 80001a8:	4b08      	ldr	r3, [pc, #32]	; (80001cc <frame_dummy+0x24>)
 80001aa:	b510      	push	{r4, lr}
 80001ac:	b11b      	cbz	r3, 80001b6 <frame_dummy+0xe>
 80001ae:	4808      	ldr	r0, [pc, #32]	; (80001d0 <frame_dummy+0x28>)
 80001b0:	4908      	ldr	r1, [pc, #32]	; (80001d4 <frame_dummy+0x2c>)
 80001b2:	f3af 8000 	nop.w
 80001b6:	4808      	ldr	r0, [pc, #32]	; (80001d8 <frame_dummy+0x30>)
 80001b8:	6803      	ldr	r3, [r0, #0]
 80001ba:	b903      	cbnz	r3, 80001be <frame_dummy+0x16>
 80001bc:	bd10      	pop	{r4, pc}
 80001be:	4b07      	ldr	r3, [pc, #28]	; (80001dc <frame_dummy+0x34>)
 80001c0:	2b00      	cmp	r3, #0
 80001c2:	d0fb      	beq.n	80001bc <frame_dummy+0x14>
 80001c4:	e8bd 4010 	ldmia.w	sp!, {r4, lr}
 80001c8:	4718      	bx	r3
 80001ca:	bf00      	nop
 80001cc:	00000000 	.word	0x00000000
 80001d0:	0801085c 	.word	0x0801085c
 80001d4:	200004bc 	.word	0x200004bc
 80001d8:	200004b4 	.word	0x200004b4
 80001dc:	00000000 	.word	0x00000000

080001e0 <_mainCRTStartup>:
 80001e0:	4b15      	ldr	r3, [pc, #84]	; (8000238 <_mainCRTStartup+0x58>)
 80001e2:	2b00      	cmp	r3, #0
 80001e4:	bf08      	it	eq
 80001e6:	4b13      	ldreq	r3, [pc, #76]	; (8000234 <_mainCRTStartup+0x54>)
 80001e8:	469d      	mov	sp, r3
 80001ea:	f5a3 3a80 	sub.w	sl, r3, #65536	; 0x10000
 80001ee:	2100      	movs	r1, #0
 80001f0:	468b      	mov	fp, r1
 80001f2:	460f      	mov	r7, r1
 80001f4:	4813      	ldr	r0, [pc, #76]	; (8000244 <_mainCRTStartup+0x64>)
 80001f6:	4a14      	ldr	r2, [pc, #80]	; (8000248 <_mainCRTStartup+0x68>)
 80001f8:	1a12      	subs	r2, r2, r0
 80001fa:	f010 f819 	bl	8010230 <memset>
 80001fe:	4b0f      	ldr	r3, [pc, #60]	; (800023c <_mainCRTStartup+0x5c>)
 8000200:	2b00      	cmp	r3, #0
 8000202:	d000      	beq.n	8000206 <_mainCRTStartup+0x26>
 8000204:	4798      	blx	r3
 8000206:	4b0e      	ldr	r3, [pc, #56]	; (8000240 <_mainCRTStartup+0x60>)
 8000208:	2b00      	cmp	r3, #0
 800020a:	d000      	beq.n	800020e <_mainCRTStartup+0x2e>
 800020c:	4798      	blx	r3
 800020e:	2000      	movs	r0, #0
 8000210:	2100      	movs	r1, #0
 8000212:	0004      	movs	r4, r0
 8000214:	000d      	movs	r5, r1
 8000216:	480d      	ldr	r0, [pc, #52]	; (800024c <_mainCRTStartup+0x6c>)
 8000218:	2800      	cmp	r0, #0
 800021a:	d002      	beq.n	8000222 <_mainCRTStartup+0x42>
 800021c:	480c      	ldr	r0, [pc, #48]	; (8000250 <_mainCRTStartup+0x70>)
 800021e:	f010 f8f7 	bl	8010410 <atexit>
 8000222:	f00f ffdd 	bl	80101e0 <__libc_init_array>
 8000226:	0020      	movs	r0, r4
 8000228:	0029      	movs	r1, r5
 800022a:	f00f ff5d 	bl	80100e8 <main>
 800022e:	f00f ffc7 	bl	80101c0 <exit>
 8000232:	bf00      	nop
 8000234:	00080000 	.word	0x00080000
	...
 8000244:	200004b8 	.word	0x200004b8
 8000248:	20000d08 	.word	0x20000d08
 800024c:	08010411 	.word	0x08010411
 8000250:	0801041d 	.word	0x0801041d

symbol table에서 각 함수의 크기를 확인할 수 있다.

크기가 큰 함수나, 불필요한 함수는 제거하자.

arm-none-eabi-objdump -S -h -d -t main.o > ..\main.lst
SYMBOL TABLE:
08000000 l    d  .isr_vector	00000000 .isr_vector
08000184 l    d  .text	00000000 .text
0801085c l    d  .eh_frame	00000000 .eh_frame
08010860 l    d  .ARM	00000000 .ARM
00000000 l    d  .ARM.attributes	00000000 .ARM.attributes
08010868 l    d  .init_array	00000000 .init_array
08010870 l    d  .fini_array	00000000 .fini_array
20000000 l    d  .data	00000000 .data
200004b4 l    d  .jcr	00000000 .jcr
64000000 l    d  .fsmc_sram_data	00000000 .fsmc_sram_data
64000000 l    d  .fsmc_sram_bss	00000000 .fsmc_sram_bss
64000000 l    d  .fsmc_sram_perma	00000000 .fsmc_sram_perma
200004b8 l    d  .bss	00000000 .bss
20000d08 l    d  ._user_heap_stack	00000000 ._user_heap_stack
080ff800 l    d  .factory_values	00000000 .factory_values
00000000 l    d  .debug_info	00000000 .debug_info
00000000 l    d  .debug_abbrev	00000000 .debug_abbrev
00000000 l    d  .debug_loc	00000000 .debug_loc
00000000 l    d  .debug_aranges	00000000 .debug_aranges
00000000 l    d  .debug_ranges	00000000 .debug_ranges
00000000 l    d  .debug_line	00000000 .debug_line
00000000 l    d  .debug_str	00000000 .debug_str
00000000 l    d  .comment	00000000 .comment
00000000 l    d  .debug_frame	00000000 .debug_frame
00000000 l    df *ABS*	00000000 C:\DOCUME~1\a\LOCALS~1\Temp\ccG34aLa.o
08010184 l       .text	00000000 LoopCopyDataInit
0801017c l       .text	00000000 CopyDataInit
08010198 l       .text	00000000 LoopFillZerobss
08010192 l       .text	00000000 FillZerobss
080101bc l       .text	00000000 Infinite_Loop
00000000 l    df *ABS*	00000000 d:/arm/bin/../lib/gcc/arm-none-eabi/4.9.3/armv7-m/crti.o
00000000 l    df *ABS*	00000000 crtstuff.c
0801085c l     O .eh_frame	00000000 __EH_FRAME_BEGIN__
200004b4 l     O .jcr	00000000 __JCR_LIST__
08000184 l     F .text	00000000 __do_global_dtors_aux
200004b8 l       .bss	00000000 completed.8108

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