akhilpo

Does it work if there is -Os flag set?

I have fixed it. I changed the -Os flag in 'makedef' file in stellarisware to -O0. And then recompiled the whole stellaris library. Now its showing the debug symbols.

Thanks for the reply. I didn't know that. I have just started learning about assembly programming is ARM.

Hi, I am trying to learn debugging Stellaris launchpad using gcc. I am using the GCC arm embedded toolchain. And I am trying to debug the blinky example project in the stellarisware. But GDB complains that it can't find the debuggin symbols. I have tried defining the symbol "DEBUG" in the source code, but that failed. Please tell me how I can fix this issue? Akhils-MacBook-Pro:blinky akhil$ arm-none-eabi-gdb gcc/blinky.axf GNU gdb (GNU Tools for ARM Embedded Processors) 7.6.0.20140731-cvs Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "--host=x86_64-apple-darwin10 --target=arm-none-eabi". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /Users/akhil/work/blinky/gcc/blinky.axf...(no debugging symbols found)...done.

I know that the first word is the address of the top of the stack. In startup_gcc.c file in the stellarisware projects, the address of the reset_isr subroutine is stored in the second word space in the _text section. In the objdump of the blinky.axf file, a value of 0x2d1 is stored at address 0x04 in _text section. But the reset_isr subroutine is stored at address 0x2d0. This is confusing me. Isn't a value of 0x2d0 supposed to be at address 0x04 in _text section? Please explain me where I am wrong. I have attached the objdump of blinky.axf here. Akhils-MacBook-Pro:blinky akhil$ arm-none-eabi-objdump -d -s -x gcc/blinky.axf gcc/blinky.axf: file format elf32-littlearm gcc/blinky.axf architecture: arm, flags 0x00000112: EXEC_P, HAS_SYMS, D_PAGED start address 0x000002d1 Program Header: LOAD off 0x00008000 vaddr 0x00000000 paddr 0x00000000 align 2**15 filesz 0x00000320 memsz 0x00000320 flags r-x LOAD off 0x00010000 vaddr 0x20000000 paddr 0x20000000 align 2**15 filesz 0x00000000 memsz 0x00000100 flags rw- private flags = 5000002: [Version5 EABI] [has entry point] Sections: Idx Name Size VMA LMA File off Algn 0 .text 00000320 00000000 00000000 00008000 2**2 CONTENTS, ALLOC, LOAD, READONLY, CODE 1 .bss 00000100 20000000 20000000 00010000 2**2 ALLOC 2 .comment 00000070 00000000 00000000 00008320 2**0 CONTENTS, READONLY 3 .ARM.attributes 00000037 00000000 00000000 00008390 2**0 CONTENTS, READONLY SYMBOL TABLE: 00000000 l d .text 00000000 .text 20000000 l d .bss 00000000 .bss 00000000 l d .comment 00000000 .comment 00000000 l d .ARM.attributes 00000000 .ARM.attributes 00000000 l df *ABS* 00000000 startup_gcc.c 000002c8 l F .text 00000002 NmiSR 000002ca l F .text 00000002 FaultISR 000002cc l F .text 00000002 IntDefaultHandler 000002ee l F .text 00000000 zero_loop 20000000 l O .bss 00000100 pulStack 00000000 l df *ABS* 00000000 blinky.c 00000000 l df *ABS* 00000000 00000320 g .text 00000000 _etext 20000100 g .bss 00000000 _ebss 20000000 g .bss 00000000 _bss 00000000 g .text 00000000 _text 0000026c g F .text 0000005c main 20000000 g .text 00000000 _data 20000000 g .text 00000000 _edata 00000000 g O .text 0000026c g_pfnVectors 000002d0 g F .text 00000048 ResetISR Contents of section .text: 0000 00010020 d1020000 c9020000 cb020000 ... ............ 0010 cd020000 cd020000 cd020000 00000000 ................ 0020 00000000 00000000 00000000 cd020000 ................ 0030 cd020000 00000000 cd020000 cd020000 ................ 0040 cd020000 cd020000 cd020000 cd020000 ................ 0050 cd020000 cd020000 cd020000 cd020000 ................ 0060 cd020000 cd020000 cd020000 cd020000 ................ 0070 cd020000 cd020000 cd020000 cd020000 ................ 0080 cd020000 cd020000 cd020000 cd020000 ................ 0090 cd020000 cd020000 cd020000 cd020000 ................ 00a0 cd020000 cd020000 cd020000 cd020000 ................ 00b0 cd020000 cd020000 cd020000 cd020000 ................ 00c0 cd020000 cd020000 cd020000 cd020000 ................ 00d0 cd020000 cd020000 cd020000 cd020000 ................ 00e0 cd020000 cd020000 cd020000 cd020000 ................ 00f0 cd020000 cd020000 cd020000 cd020000 ................ 0100 cd020000 cd020000 cd020000 cd020000 ................ 0110 cd020000 cd020000 cd020000 cd020000 ................ 0120 cd020000 cd020000 cd020000 cd020000 ................ 0130 cd020000 cd020000 cd020000 cd020000 ................ 0140 00000000 00000000 00000000 00000000 ................ 0150 cd020000 cd020000 cd020000 cd020000 ................ 0160 00000000 00000000 00000000 00000000 ................ 0170 00000000 00000000 00000000 00000000 ................ 0180 00000000 00000000 00000000 00000000 ................ 0190 00000000 00000000 00000000 00000000 ................ 01a0 00000000 00000000 00000000 00000000 ................ 01b0 cd020000 cd020000 cd020000 cd020000 ................ 01c0 cd020000 cd020000 cd020000 cd020000 ................ 01d0 cd020000 cd020000 cd020000 cd020000 ................ 01e0 cd020000 cd020000 cd020000 cd020000 ................ 01f0 cd020000 cd020000 cd020000 cd020000 ................ 0200 cd020000 cd020000 cd020000 00000000 ................ 0210 cd020000 cd020000 cd020000 cd020000 ................ 0220 cd020000 cd020000 cd020000 cd020000 ................ 0230 cd020000 cd020000 cd020000 cd020000 ................ 0240 cd020000 cd020000 cd020000 cd020000 ................ 0250 cd020000 cd020000 cd020000 cd020000 ................ 0260 cd020000 cd020000 cd020000 124b2022 .............K " 0270 1a6082b0 1b68114a 01930823 1360c2f8 .`...h.J...#.`.. 0280 1c310f4b 1a6842f0 08021a60 00220192 .1.K.hB....`.".. 0290 01990c4a 914202d8 019a0132 f7e71a68 ...J.B.....2...h 02a0 22f00802 1a600023 0193019a 054b9a42 "....`.#.....K.B 02b0 e7d8019b 0133f7e7 08e10f40 00540240 .....3.....@.T.@ 02c0 fc530240 3f0d0300 fee7fee7 fee70000 .S.@?........... 02d0 00230d4a 0d499818 884204d2 0c495958 .#.J.I...B...IYX 02e0 99500433 f5e70c48 0c494ff0 00028842 .P.3...H.IO....B 02f0 b8bf40f8 042bfff6 faaf064b 1a6842f4 ..@..+.....K.hB. 0300 70021a60 fff7b2bf 00000020 00000020 p..`....... ... 0310 20030000 88ed00e0 00000020 00010020 .......... ... Contents of section .comment: 0000 4743433a 2028474e 5520546f 6f6c7320 GCC: (GNU Tools 0010 666f7220 41524d20 456d6265 64646564 for ARM Embedded 0020 2050726f 63657373 6f727329 20342e38 Processors) 4.8 0030 2e342032 30313430 37323520 2872656c .4 20140725 (rel 0040 65617365 29205b41 524d2f65 6d626564 ease) [ARM/embed 0050 6465642d 345f382d 6272616e 63682072 ded-4_8-branch r 0060 65766973 696f6e20 32313331 34375d00 evision 213147]. Contents of section .ARM.attributes: 0000 41360000 00616561 62690001 2c000000 A6...aeabi..,... 0010 05436f72 7465782d 4d340006 0d074d09 .Cortex-M4....M. 0020 020a0612 04140115 01170318 0119011a ................ 0030 011b031e 042201 .....". Disassembly of section .text: 00000000 <_text>: 0: 20000100 .word 0x20000100 4: 000002d1 .word 0x000002d1 8: 000002c9 .word 0x000002c9 c: 000002cb .word 0x000002cb 10: 000002cd .word 0x000002cd 14: 000002cd .word 0x000002cd 18: 000002cd .word 0x000002cd ... 2c: 000002cd .word 0x000002cd 30: 000002cd .word 0x000002cd 34: 00000000 .word 0x00000000 38: 000002cd .word 0x000002cd 3c: 000002cd .word 0x000002cd 40: 000002cd .word 0x000002cd 44: 000002cd .word 0x000002cd 48: 000002cd .word 0x000002cd 4c: 000002cd .word 0x000002cd 50: 000002cd .word 0x000002cd 54: 000002cd .word 0x000002cd 58: 000002cd .word 0x000002cd 5c: 000002cd .word 0x000002cd 60: 000002cd .word 0x000002cd 64: 000002cd .word 0x000002cd 68: 000002cd .word 0x000002cd 6c: 000002cd .word 0x000002cd 70: 000002cd .word 0x000002cd 74: 000002cd .word 0x000002cd 78: 000002cd .word 0x000002cd 7c: 000002cd .word 0x000002cd 80: 000002cd .word 0x000002cd 84: 000002cd .word 0x000002cd 88: 000002cd .word 0x000002cd 8c: 000002cd .word 0x000002cd 90: 000002cd .word 0x000002cd 94: 000002cd .word 0x000002cd 98: 000002cd .word 0x000002cd 9c: 000002cd .word 0x000002cd a0: 000002cd .word 0x000002cd a4: 000002cd .word 0x000002cd a8: 000002cd .word 0x000002cd ac: 000002cd .word 0x000002cd b0: 000002cd .word 0x000002cd b4: 000002cd .word 0x000002cd b8: 000002cd .word 0x000002cd bc: 000002cd .word 0x000002cd c0: 000002cd .word 0x000002cd c4: 000002cd .word 0x000002cd c8: 000002cd .word 0x000002cd cc: 000002cd .word 0x000002cd d0: 000002cd .word 0x000002cd d4: 000002cd .word 0x000002cd d8: 000002cd .word 0x000002cd dc: 000002cd .word 0x000002cd e0: 000002cd .word 0x000002cd e4: 000002cd .word 0x000002cd e8: 000002cd .word 0x000002cd ec: 000002cd .word 0x000002cd f0: 000002cd .word 0x000002cd f4: 000002cd .word 0x000002cd f8: 000002cd .word 0x000002cd fc: 000002cd .word 0x000002cd 100: 000002cd .word 0x000002cd 104: 000002cd .word 0x000002cd 108: 000002cd .word 0x000002cd 10c: 000002cd .word 0x000002cd 110: 000002cd .word 0x000002cd 114: 000002cd .word 0x000002cd 118: 000002cd .word 0x000002cd 11c: 000002cd .word 0x000002cd 120: 000002cd .word 0x000002cd 124: 000002cd .word 0x000002cd 128: 000002cd .word 0x000002cd 12c: 000002cd .word 0x000002cd 130: 000002cd .word 0x000002cd 134: 000002cd .word 0x000002cd 138: 000002cd .word 0x000002cd 13c: 000002cd .word 0x000002cd ... 150: 000002cd .word 0x000002cd 154: 000002cd .word 0x000002cd 158: 000002cd .word 0x000002cd 15c: 000002cd .word 0x000002cd ... 1b0: 000002cd .word 0x000002cd 1b4: 000002cd .word 0x000002cd 1b8: 000002cd .word 0x000002cd 1bc: 000002cd .word 0x000002cd 1c0: 000002cd .word 0x000002cd 1c4: 000002cd .word 0x000002cd 1c8: 000002cd .word 0x000002cd 1cc: 000002cd .word 0x000002cd 1d0: 000002cd .word 0x000002cd 1d4: 000002cd .word 0x000002cd 1d8: 000002cd .word 0x000002cd 1dc: 000002cd .word 0x000002cd 1e0: 000002cd .word 0x000002cd 1e4: 000002cd .word 0x000002cd 1e8: 000002cd .word 0x000002cd 1ec: 000002cd .word 0x000002cd 1f0: 000002cd .word 0x000002cd 1f4: 000002cd .word 0x000002cd 1f8: 000002cd .word 0x000002cd 1fc: 000002cd .word 0x000002cd 200: 000002cd .word 0x000002cd 204: 000002cd .word 0x000002cd 208: 000002cd .word 0x000002cd 20c: 00000000 .word 0x00000000 210: 000002cd .word 0x000002cd 214: 000002cd .word 0x000002cd 218: 000002cd .word 0x000002cd 21c: 000002cd .word 0x000002cd 220: 000002cd .word 0x000002cd 224: 000002cd .word 0x000002cd 228: 000002cd .word 0x000002cd 22c: 000002cd .word 0x000002cd 230: 000002cd .word 0x000002cd 234: 000002cd .word 0x000002cd 238: 000002cd .word 0x000002cd 23c: 000002cd .word 0x000002cd 240: 000002cd .word 0x000002cd 244: 000002cd .word 0x000002cd 248: 000002cd .word 0x000002cd 24c: 000002cd .word 0x000002cd 250: 000002cd .word 0x000002cd 254: 000002cd .word 0x000002cd 258: 000002cd .word 0x000002cd 25c: 000002cd .word 0x000002cd 260: 000002cd .word 0x000002cd 264: 000002cd .word 0x000002cd 268: 000002cd .word 0x000002cd 0000026c <main>: 26c: 4b12 ldr r3, [pc, #72] ; (2b8 <main+0x4c>) 26e: 2220 movs r2, #32 270: 601a str r2, [r3, #0] 272: b082 sub sp, #8 274: 681b ldr r3, [r3, #0] 276: 4a11 ldr r2, [pc, #68] ; (2bc <main+0x50>) 278: 9301 str r3, [sp, #4] 27a: 2308 movs r3, #8 27c: 6013 str r3, [r2, #0] 27e: f8c2 311c str.w r3, [r2, #284] ; 0x11c 282: 4b0f ldr r3, [pc, #60] ; (2c0 <main+0x54>) 284: 681a ldr r2, [r3, #0] 286: f042 0208 orr.w r2, r2, #8 28a: 601a str r2, [r3, #0] 28c: 2200 movs r2, #0 28e: 9201 str r2, [sp, #4] 290: 9901 ldr r1, [sp, #4] 292: 4a0c ldr r2, [pc, #48] ; (2c4 <main+0x58>) 294: 4291 cmp r1, r2 296: d802 bhi.n 29e <main+0x32> 298: 9a01 ldr r2, [sp, #4] 29a: 3201 adds r2, #1 29c: e7f7 b.n 28e <main+0x22> 29e: 681a ldr r2, [r3, #0] 2a0: f022 0208 bic.w r2, r2, #8 2a4: 601a str r2, [r3, #0] 2a6: 2300 movs r3, #0 2a8: 9301 str r3, [sp, #4] 2aa: 9a01 ldr r2, [sp, #4] 2ac: 4b05 ldr r3, [pc, #20] ; (2c4 <main+0x58>) 2ae: 429a cmp r2, r3 2b0: d8e7 bhi.n 282 <main+0x16> 2b2: 9b01 ldr r3, [sp, #4] 2b4: 3301 adds r3, #1 2b6: e7f7 b.n 2a8 <main+0x3c> 2b8: 400fe108 .word 0x400fe108 2bc: 40025400 .word 0x40025400 2c0: 400253fc .word 0x400253fc 2c4: 00030d3f .word 0x00030d3f 000002c8 <NmiSR>: 2c8: e7fe b.n 2c8 <NmiSR> 000002ca <FaultISR>: 2ca: e7fe b.n 2ca <FaultISR> 000002cc <IntDefaultHandler>: 2cc: e7fe b.n 2cc <IntDefaultHandler> ... 000002d0 <ResetISR>: 2d0: 2300 movs r3, #0 2d2: 4a0d ldr r2, [pc, #52] ; (308 <zero_loop+0x1a>) 2d4: 490d ldr r1, [pc, #52] ; (30c <zero_loop+0x1e>) 2d6: 1898 adds r0, r3, r2 2d8: 4288 cmp r0, r1 2da: d204 bcs.n 2e6 <ResetISR+0x16> 2dc: 490c ldr r1, [pc, #48] ; (310 <zero_loop+0x22>) 2de: 5859 ldr r1, [r3, r1] 2e0: 5099 str r1, [r3, r2] 2e2: 3304 adds r3, #4 2e4: e7f5 b.n 2d2 <ResetISR+0x2> 2e6: 480c ldr r0, [pc, #48] ; (318 <zero_loop+0x2a>) 2e8: 490c ldr r1, [pc, #48] ; (31c <zero_loop+0x2e>) 2ea: f04f 0200 mov.w r2, #0 000002ee <zero_loop>: 2ee: 4288 cmp r0, r1 2f0: bfb8 it lt 2f2: f840 2b04 strlt.w r2, [r0], #4 2f6: f6ff affa blt.w 2ee <zero_loop> 2fa: 4b06 ldr r3, [pc, #24] ; (314 <zero_loop+0x26>) 2fc: 681a ldr r2, [r3, #0] 2fe: f442 0270 orr.w r2, r2, #15728640 ; 0xf00000 302: 601a str r2, [r3, #0] 304: f7ff bfb2 b.w 26c <main> 308: 20000000 .word 0x20000000 30c: 20000000 .word 0x20000000 310: 00000320 .word 0x00000320 314: e000ed88 .word 0xe000ed88 318: 20000000 .word 0x20000000 31c: 20000100 .word 0x20000100 Akhils-MacBook-Pro:blinky akhil$