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akhilpo

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Posts posted by akhilpo

  1. 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.
    
  2. 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$
    
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