MDK开发环境STM32启动文件_main函数分析

2018-08-14 来源：eefocus

========================================================================

** Section #1 'ER_IROM1' (SHT_PROGBITS) [SHF_ALLOC + SHF_EXECINSTR]

Size : 1008 bytes (alignment 4)

Address: 0x08000000

$d.realdata

RESET

__Vectors ;向量表起始地址

0x08000000: 20000460 `.. DCD 536872032 ;栈顶指针地址0x20000460

0x08000004: 08000369 i... DCD 134218601 ;Reset_Handler地址

0x08000008: 08000371 q... DCD 134218609

0x0800000c: 08000373 s... DCD 134218611

0x08000010: 08000375 u... DCD 134218613

0x08000014: 08000377 w... DCD 134218615

0x08000018: 08000379 y... DCD 134218617

...

.ARM.Collect$$$$00000000

.ARM.Collect$$$$00000001

__Vectors_End ;向量表结束

__main

_main_stk

0x08000130: f8dfd00c .... LDR sp,__lit__00000000 ; [0x8000140] = 0x20000460

.ARM.Collect$$$$00000004 ;设置栈顶指针

_main_scatterload

0x08000134: f000f92a ..*. BL __scatterload ; 0x800038c ;跳转到__scatterload

.ARM.Collect$$$$00000008

.ARM.Collect$$$$0000000A

.ARM.Collect$$$$0000000B

__main_after_scatterload

_main_clock

_main_cpp_init

_main_init

0x08000138: 4800 .H LDR r0,[pc,#0] ; [0x800013c] = 0x8000145 ;跳转到main函数, 0x0800013c

0x0800013a: 4700 .G BX r0

0x0800013c: 08000145 E... DCD 134218053

.ARM.Collect$$$$00002712

__lit__00000000

.ARM.Collect$$$$0000000D

.ARM.Collect$$$$0000000F

__rt_final_cpp

__rt_final_exit

0x08000140: 20000460 `.. DCD 536872032

.text

main ;main函数

0x08000144: bf00 .. NOP

0x08000146: bf00 .. NOP

0x08000148: 2003 . MOVS r0,#3

0x0800014a: 490c .I LDR r1,[pc,#48] ; [0x800017c] = 0x20000000

...

SystemInit ;SystemInit函数

0x08000266: b510 .. PUSH {r4,lr}

0x08000268: 4836 6H LDR r0,[pc,#216] ;

...

.text

Reset_Handler

0x08000368: 4806 .H LDR r0,[pc,#24] ; [0x8000384] = 0x8000267 ;加载SystemInit函数地址到R0，0x08000267

0x0800036a: 4780 .G BLX r0 ;跳转到SystemInit

0x0800036c: 4806 .H LDR r0,[pc,#24] ; [0x8000388] = 0x8000131 ;加载_main函数地址到R0，0x8000131

0x0800036e: 4700 .G BX r0 ;跳转到_main

```

0x08000384: 08000267 g... DCD 134218343

0x08000388: 08000131 1... DCD 134218033

.text

__scatterload

__scatterload_rt2

;在RO段最后一部分，0x80003d0 - 0x80003f0存储的是

;RW和ZI段的加载域、存储域地址、段长度、以及RW段拷贝

;__scatterload_copy、ZI清零__scatterload_zeroinit

;函数的地址

0x0800038c: 4c06 .L LDR r4,[pc,#24] ; [0x80003a8] = 0x80003d0 ;R4 = 0x80003d0, Region$$Table的起始地址

0x0800038e: 4d07 .M LDR r5,[pc,#28] ; [0x80003ac] = 0x80003f0 ;R5 = 0x80003f0, Region$$Table的结束地址

0x08000390: e006 .. B 0x80003a0 ; __scatterload + 20

0x08000392: 68e0 .h LDR r0,[r4,#0xc] ;加载R4+0xC地址的值到R0,RW段拷贝或ZI清零函数的地址

0x08000394: f0400301 @... ORR r3,r0,#1 ;R3 = [R0] | 0x1, R0最低位置1，给R3

0x08000398: e8940007 .... LDM r4,{r0-r2} ;加载RW或ZI段的加载域、运行域地址以及段长度到R0 R1 R2

0x0800039c: 4798 .G BLX r3 ;跳转到RW段拷贝或ZI清零函数

0x0800039e: 3410 .4 ADDS r4,r4,#0x10 ;段拷贝完成后，开始进行ZI清零， R4 + 0x10

0x080003a0: 42ac .B CMP r4,r5 ;比较R4, R5

0x080003a2: d3f6 .. BCC 0x8000392 ; __scatterload + 6 ;R4 R5不相等时，跳转到0x8000392

0x080003a4: f7fffec8 .... BL __main_after_scatterload ; 0x8000138 ;RW段拷贝和ZI段清零完成后，进入main函数

0x080003a8: 080003d0 .... DCD 134218704

0x080003ac: 080003f0 .... DCD 134218736

i.__scatterload_copy

__scatterload_copy

0x080003b0: e002 .. B 0x80003b8 ; __scatterload_copy + 8

0x080003b2: c808 .. LDM r0!,{r3} ;R0为RW段加载域地址, R3 = [R0], R0 = R0 + 4

0x080003b4: 1f12 .. SUBS r2,r2,#4 ;R2为RW段数据长度, R2减4

0x080003b6: c108 .. STM r1!,{r3} ;R1为RW段运行域地址, R3值写入R1地址

0x080003b8: 2a00 .* CMP r2,#0 ;R2为剩余待拷贝RW段长度

0x080003ba: d1fa .. BNE 0x80003b2 ; __scatterload_copy + 2 ;拷贝未完成，继续拷贝

0x080003bc: 4770 pG BX lr ;返回0x0800039F

i.__scatterload_null

__scatterload_null

0x080003be: 4770 pG BX lr

i.__scatterload_zeroinit

__scatterload_zeroinit

0x080003c0: 2000 . MOVS r0,#0

0x080003c2: e001 .. B 0x80003c8 ; __scatterload_zeroinit + 8

0x080003c4: c101 .. STM r1!,{r0} ;R0的值写入R1地址, R1 + 4

0x080003c6: 1f12 .. SUBS r2,r2,#4 ;R2为ZI段数据长度, R2减4

0x080003c8: 2a00 .* CMP r2,#0 ;R2为剩余待清零的数据长度

0x080003ca: d1fb .. BNE 0x80003c4 ; __scatterload_zeroinit + 4 ;清零未完成，继续

0x080003cc: 4770 pG BX lr ;返回0x0800039F

0x080003ce: 0000 .. MOVS r0,r0

$d.realdata

Region$$Table$$Base

0x080003d0: 080003f0 .... DCD 134218736 ;加载域RW段地址

0x080003d4: 20000000 ... DCD 536870912 ;运行域RW段地址

0x080003d8: 0000001c .... DCD 28 ;RW段长度

0x080003dc: 080003b0 .... DCD 134218672 ;__scatterload_copy函数地址

0x080003e0: 0800040c .... DCD 134218764 ;加载域结束地址

0x080003e4: 2000001c ... DCD 536870940 ;运行域ZI段地址

0x080003e8: 00000444 D... DCD 1092 ;ZI段长度

0x080003ec: 080003c0 .... DCD 134218688 ;__scatterload_zeroinit函数地址

Region$$Table$$Limit

Section #2 'RW_IRAM1' (SHT_PROGBITS) [SHF_ALLOC + SHF_WRITE] ;RW段地址0x20000000, 长度28 bytes

Size : 28 bytes (alignment 4)

Address: 0x20000000

Section #3 'RW_IRAM1' (SHT_NOBITS) [SHF_ALLOC + SHF_WRITE] ;ZI段地址0x2000001c, 长度1092 bytes

Size : 1092 bytes (alignment 8)

Address: 0x2000001c

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MDK 开发环境 STM32 启动文件 main函数

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