2019-04-17
【小记】
APP的IAR工程中的中断向量表偏移是在系统库中的 __iar_program_start 处实现的
启动代码 stm32f769xx.s
1 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 2 ;; 3 ;; Default interrupt handlers. 4 ;; 5 THUMB 6 PUBWEAK Reset_Handler 7 SECTION .text:CODE:NOROOT:REORDER(2) 8 Reset_Handler 9 10 LDR R0, =SystemInit 11 BLX R0 12 LDR R0, =__iar_program_start 13 BX R0 14 15 PUBWEAK NMI_Handler 16 SECTION .text:CODE:NOROOT:REORDER(1)
经调试看到 __iar_program_start 的反汇编
1 Reset_Handler: 2 0x80385d0: 0x4801 LDR.N R0, [PC, #0x4] ; SystemInit 3 BLX R0 4 0x80385d2: 0x4780 BLX R0 5 LDR R0, =__iar_program_start 6 0x80385d4: 0x4801 LDR.N R0, [PC, #0x4] ; __iar_program_start 7 BX R0 8 0x80385d6: 0x4700 BX R0 9 SECTION .text:CODE:NOROOT:REORDER(1) 10 0x80385d8: 0x0802586d DC32 SystemInit 11 SECTION .text:CODE:NOROOT:REORDER(1) 12 0x80385dc: 0x080385f9 DC32 __iar_program_start 13 0x80385e0: 0x70636573 DC32 0x70636573 (1885562227) 14 0x80385e4: 0x72363532 DC32 0x72363532 (1916155186) 15 0x80385e8: 0x00000031 DC32 0x31 (49) 16 0x80385ec: 0x72617453 DC32 0x72617453 (1918989395) 17 0x80385f0: 0x00000074 DC32 0x74 (116) 18 0x80385f4: 0x00544f49 DC32 0x544f49 (5525321) 19 __iar_program_start: 20 0x80385f8: 0xf3af 0x8000 NOP.W 21 0x80385fc: 0xf7ff 0xff90 BL __iar_init_vfp ; 0x8038520 22 0x8038600: 0xf7ff 0xffb0 BL ?main ; 0x8038564 23 APBPrescTable: 24 0x8038604: 0x00000000 DC32 0x0 (0) 25 0x8038608: 0x04030201 DC32 0x4030201 (67305985) 26 0x803860c: 0x002e0000 DC32 0x2e0000 (3014656) 27 0x8038610: 0x0043 DC16 67 ; 'C.' 28 B WWDG_IRQHandler
1 __iar_init_vfp: 2 0x8038520: 0xf64e 0x5188 MOVW R1, #60808 ; 0xed88 3 0x8038524: 0xf2ce 0x0100 MOVT R1, #57344 ; 0xe000 4 0x8038528: 0x6808 LDR R0, [R1] 5 0x803852a: 0xf440 0x0070 ORR.W R0, R0, #15728640 ; 0xf00000 6 0x803852e: 0x6008 STR R0, [R1] 7 0x8038530: 0xf3bf 0x8f4f DSB 8 0x8038534: 0xf3bf 0x8f6f ISB 9 0x8038538: 0xf04f 0x7000 MOV.W R0, #33554432 ; 0x2000000 10 0x803853c: 0xeee1 0x0a10 VMSR FPSCR, R0 11 0x8038540: 0x4770 BX LR 12 0x8038542: 0x0000 MOVS R0, R0 13 Region$$Table$$Base: 14 0x8038544: 0xfffdb3e7 DC32 0xfffdb3e7 (-150553) 15 0x8038548: 0x000220dc DC32 0x220dc (139484) 16 0x803854c: 0x20000204 DC32 xStart 17 0x8038550: 0x00000000 DC32 0x0 (0) 18 0x8038554: 0xfffdb2b7 DC32 0xfffdb2b7 (-150857) 19 0x8038558: 0x00000262 DC32 0x262 (610) 20 0x803855c: 0x000001a2 DC32 0x1a2 (418) 21 0x8038560: 0x20000000 DC32 global_hooks 22 ?main: 23 Region$$Table$$Limit: 24 __cmain: 25 0x8038564: 0xf000 0xf80d BL __low_level_init ; 0x8038582 26 0x8038568: 0x2800 CMP R0, #0 27 0x803856a: 0xd001 BEQ.N _call_main ; 0x8038570 28 0x803856c: 0xf7ff 0xffb2 BL __iar_data_init3 ; 0x80384d4