Tool/software: Code Composer Studio
Hi,
I've had a weird situation where the standard system startup code for a project causes a data abort. I have two projects, one initially created as a "Hello World" example, and the other as an empty (no main) C project. Each has been subsequently modified so that they have identical project Properties (this has been thoroughly checked), identical sources, identical symbols, identical directory paths, identical everything. But while the _start code for the "hello World" version is fine, the version for the empty project causes a target exception.
The problem is not insurmountable -- as long as you create every new project as a "Hello World" example. But you shouldn't have to do that so maybe someone could shed some light on this anomaly.
My setup is as follows:
CCS Version: 6.1.2.00015
pdk_am335x_1_0_3
GNU v4.9.3 (Linaro)
Win 7 64-bit
The good/"Hello World" _start code is as follows (copied from the disassembly window):
40300108: E3B00016 movs r0, #0x16
4030010c: E28F1F4A add r1, pc, #0x128
40300110: EF123456 svc #0x123456
40300114: E59F0120 ldr r0, [pc, #0x120]
40300118: E5901004 ldr r1, [r0, #4]
4030011c: E59F2138 ldr r2, [pc, #0x138]
40300120: E5821000 str r1, [r2]
40300124: E5901000 ldr r1, [r0]
40300128: E3510000 cmp r1, #0
4030012c: 1A000001 bne #0x40300138
40300130: E59F1120 ldr r1, [pc, #0x120]
40300134: E5801000 str r1, [r0]
40300138: E5901008 ldr r1, [r0, #8]
4030013c: E590200C ldr r2, [r0, #0xc]
40300140: E3510000 cmp r1, #0
40300144: 0A000000 beq #0x4030014c
40300148: E1A0D001 mov sp, r1
4030014c: E3520000 cmp r2, #0
40300150: 0A000000 beq #0x40300158
40300154: E282AC01 add r10, r2, #0x100
40300158: E3B01000 movs r1, #0
4030015c: E1A0B001 mov r11, r1
40300160: E1A07001 mov r7, r1
40300164: E59F00D4 ldr r0, [pc, #0xd4]
40300168: E59F20D4 ldr r2, [pc, #0xd4]
4030016c: E0522000 subs r2, r2, r0
40300170: EB001963 bl memset
40300174: EB0013A5 bl initialise_monitor_handles
40300178: E3B00015 movs r0, #0x15
4030017c: E28F10CC add r1, pc, #0xcc
40300180: EF123456 svc #0x123456
40300184: E59F10C4 ldr r1, [pc, #0xc4]
40300188: E3B00000 movs r0, #0
4030018c: E92D0001 stmdb sp!, {r0}
40300190: E4D13001 ldrb r3, [r1], #1
40300194: E3530000 cmp r3, #0
40300198: 0A000011 beq #0x403001e4
4030019c: E3530020 cmp r3, #0x20
403001a0: 0AFFFFFA beq #0x40300190
403001a4: E3530022 cmp r3, #0x22
403001a8: 13530027 cmpne r3, #0x27
403001ac: 01A02003 moveq r2, r3
403001b0: 13A02020 movne r2, #0x20
403001b4: 12411001 subne r1, r1, #1
403001b8: E92D0002 stmdb sp!, {r1}
403001bc: E2900001 adds r0, r0, #1
403001c0: E4D13001 ldrb r3, [r1], #1
403001c4: E3530000 cmp r3, #0
403001c8: 0A000005 beq #0x403001e4
403001cc: E1520003 cmp r2, r3
403001d0: 1AFFFFFA bne #0x403001c0
403001d4: E3B02000 movs r2, #0
403001d8: E2513001 subs r3, r1, #1
403001dc: E5C32000 strb r2, [r3]
403001e0: EAFFFFEA b #0x40300190
403001e4: E1A0100D mov r1, sp
403001e8: E08D2100 add r2, sp, r0, lsl #2
403001ec: E1A0300D mov r3, sp
403001f0: E1520003 cmp r2, r3
403001f4: 85124004 ldrhi r4, [r2, #-4]
403001f8: 85935000 ldrhi r5, [r3]
403001fc: 85225004 strhi r5, [r2, #-4]!
40300200: 84834004 strhi r4, [r3], #4
40300204: 8AFFFFF9 bhi #0x403001f0
40300208: E3CDD007 bic sp, sp, #7
4030020c: E1B04000 movs r4, r0
40300210: E1B05001 movs r5, r1
40300214: E59F002C ldr r0, [pc, #0x2c]
40300218: E3500000 cmp r0, #0
4030021c: 0A000001 beq #0x40300228
40300220: E59F0024 ldr r0, [pc, #0x24]
40300224: EB001A49 bl atexit
40300228: EB001731 bl __libc_init_array
4030022c: E1B00004 movs r0, r4
40300230: E1B01005 movs r1, r5
40300234: EB0003DF bl main
40300238: EB001608 bl exit
4030023c: 40307794 mlasmi r0, r4, r7, r7
40300240: 403086BC ldrhtmi r8, [r0], -r12
40300244: 403087C0 eorsmi r8, r0, r0, asr #15
40300248: 40306B50 eorsmi r6, r0, r0, asr r11
4030024c: 40306F8C eorsmi r6, r0, r12, lsl #31
40300250: 403077A4 eorsmi r7, r0, r4, lsr #15
40300254: 00000001 andeq r0, r0, r1
40300258: 403087C0 eorsmi r8, r0, r0, asr #15
4030025c: 40307E6C eorsmi r7, r0, r12, ror #28
329 {
HW_RD_REG32():
The bad/empty project _start code is:
40300108: E59F30F0 ldr r3, [pc, #0xf0]
4030010c: E3530000 cmp r3, #0
40300110: 059F30E4 ldreq r3, [pc, #0xe4]
40300114: E1A0D003 mov sp, r3
40300118: E10F2000 mrs r2, apsr
4030011c: E312000F tst r2, #0xf
40300120: 0A000015 beq #0x4030017c
40300124: E321F0D1 msr cpsr_c, #0xd1
40300128: E1A0D003 mov sp, r3
4030012c: E24DAA01 sub r10, sp, #0x1000
40300130: E1A0300A mov r3, r10
40300134: E321F0D7 msr cpsr_c, #0xd7
40300138: E1A0D003 mov sp, r3
4030013c: E2433A01 sub r3, r3, #0x1000
40300140: E321F0DB msr cpsr_c, #0xdb
40300144: E1A0D003 mov sp, r3
40300148: E2433A01 sub r3, r3, #0x1000
4030014c: E321F0D2 msr cpsr_c, #0xd2
40300150: E1A0D003 mov sp, r3
40300154: E2433A02 sub r3, r3, #0x2000
40300158: E321F0D3 msr cpsr_c, #0xd3
4030015c: E1A0D003 mov sp, r3
40300160: E2433902 sub r3, r3, #0x8000
40300164: E3C330FF bic r3, r3, #0xff
40300168: E3C33CFF bic r3, r3, #0xff00
4030016c: E5033004 str r3, [r3, #-4] <<<<<<<<<<<< THIS IS A PROBLEM
40300170: E9532000 ldmdb r3, {sp} ^
40300174: E38220C0 orr r2, r2, #0xc0
40300178: E121F002 msr cpsr_c, r2
4030017c: E243A801 sub r10, r3, #0x10000
40300180: E3B01000 movs r1, #0
40300184: E1A0B001 mov r11, r1
40300188: E1A07001 mov r7, r1
4030018c: E59F0078 ldr r0, [pc, #0x78]
40300190: E59F2078 ldr r2, [pc, #0x78]
40300194: E0522000 subs r2, r2, r0
40300198: EB0009AD bl memset
4030019c: E59F3060 ldr r3, [pc, #0x60]
403001a0: E3530000 cmp r3, #0
403001a4: 0A000001 beq #0x403001b0
403001a8: E1A0E00F mov lr, pc
403001ac: E1A0F003 mov pc, r3
403001b0: E59F3050 ldr r3, [pc, #0x50]
403001b4: E3530000 cmp r3, #0
403001b8: 0A000001 beq #0x403001c4
403001bc: E1A0E00F mov lr, pc
403001c0: E1A0F003 mov pc, r3
403001c4: E3B00000 movs r0, #0
403001c8: E3B01000 movs r1, #0
403001cc: E1B04000 movs r4, r0
403001d0: E1B05001 movs r5, r1
403001d4: E59F0038 ldr r0, [pc, #0x38]
403001d8: E3500000 cmp r0, #0
403001dc: 0A000001 beq #0x403001e8
403001e0: E59F0030 ldr r0, [pc, #0x30]
403001e4: EB000A4E bl atexit
403001e8: EB000795 bl __libc_init_array
403001ec: E1B00004 movs r0, r4
403001f0: E1B01005 movs r1, r5
403001f4: EB0003DE bl main
403001f8: EB000784 bl exit
403001fc: 00080000 andeq r0, r8, r0
40300200: 40306120 eorsmi r6, r0, r0, lsr #2
40300204: 00000000 andeq r0, r0, r0
40300208: 00000000 andeq r0, r0, r0
4030020c: 403040BC ldrhtmi r4, [r0], -r12
40300210: 40304114 eorsmi r4, r0, r4, lsl r1
40300214: 40302B24 eorsmi r2, r0, r4, lsr #22
40300218: 40302B44 eorsmi r2, r0, r4, asr #22
329 {
HW_RD_REG32():
Thanks,
Gerry
