GDB can not read debug symbols

Orlando Arias <[email protected]> Tue, 29 Sep 2015 17:36:01 -0400

Newsgroups	gmane.comp.gdb.devel
Message-ID	<[email protected]>

Greetings,

I am experimenting with the msp430-elf port of gdb (7.10) and it seems
it is not reading debugging symbols gcc (5.2.0) is issuing.

The test program is:

#include <msp430.h>

__attribute__((noreturn)) void main() {
	WDTCTL = WDTPW | WDTHOLD;
	P1DIR = 0xff;
	P1OUT = 0xff;
	while(1) {
		__delay_cycles(2500000);
		P1OUT ^= 0xff;
	}
}

And it is compiled with:

$msp430-elf-gcc -g -O0 -mmcu=msp430f2013 test.c -o test.elf

readelf reports:

CU: ./test.c:
File name                            Line number    Starting address
hello.c                                        5              0xf924
hello.c                                        6              0xf924

hello.c                                        7              0xf92a

hello.c                                        8              0xf92e

hello.c                                       12              0xf932

hello.c                                       13              0xf94e

hello.c                                       14              0xf95c


When testing the program on hardware through mspdebug

$ msp430-elf-gdb ./test.elf
GNU gdb (GDB) 7.10
Copyright (C) 2015 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-unknown-linux-gnu
--target=msp430-elf".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./test.elf...done.
(gdb) target remote :1234
(gdb) break main
Breakpoint 1 at 0xf924
(gdb) cont
Continuing.

Breakpoint 1, 0x0000f924 in main ()
(gdb) step
Single stepping until exit from function main,
which has no line number information.

At this point, gdb singlesteps forever, unable to trace through the
program. However, if compiling the program using

$ msp430-elf-gcc -gstabs -O0 -mmcu=msp430f2013 test.c -o test.elf

readelf no longer reports any line number information, but GDB works as
intended. Attached is the linker script being used. Thank you.

Cheers,
Orlando.

msp430f2013.ld (text/plain, 10.8 KB)

/* ============================================================================ */
/* Copyright (c) 2015, Texas Instruments Incorporated                           */
/*  All rights reserved.                                                        */
/*                                                                              */
/*  Redistribution and use in source and binary forms, with or without          */
/*  modification, are permitted provided that the following conditions          */
/*  are met:                                                                    */
/*                                                                              */
/*  *  Redistributions of source code must retain the above copyright           */
/*     notice, this list of conditions and the following disclaimer.            */
/*                                                                              */
/*  *  Redistributions in binary form must reproduce the above copyright        */
/*     notice, this list of conditions and the following disclaimer in the      */
/*     documentation and/or other materials provided with the distribution.     */
/*                                                                              */
/*  *  Neither the name of Texas Instruments Incorporated nor the names of      */
/*     its contributors may be used to endorse or promote products derived      */
/*     from this software without specific prior written permission.            */
/*                                                                              */
/*  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" */
/*  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,       */
/*  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR      */
/*  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR            */
/*  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,       */
/*  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,         */
/*  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; */
/*  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,    */
/*  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR     */
/*  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,              */
/*  EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.                          */
/* ============================================================================ */

/* This file supports MSP430F2013 devices. */
/* Version: 1.173 */
/* Default linker script, for normal executables */

OUTPUT_ARCH(msp430)
ENTRY(_start)

MEMORY {
  SFR              : ORIGIN = 0x0000, LENGTH = 0x0010 /* END=0x0010, size 16 */
  PERIPHERAL_8BIT  : ORIGIN = 0x0010, LENGTH = 0x00F0 /* END=0x0100, size 240 */
  PERIPHERAL_16BIT : ORIGIN = 0x0100, LENGTH = 0x0100 /* END=0x0200, size 256 */
  RAM              : ORIGIN = 0x0200, LENGTH = 0x0080 /* END=0x027F, size 128 */
  INFOMEM          : ORIGIN = 0x1000, LENGTH = 0x0100 /* END=0x10FF, size 256 as 4 64-byte segments */
  INFOA            : ORIGIN = 0x10C0, LENGTH = 0x0040 /* END=0x10FF, size 64 */
  INFOB            : ORIGIN = 0x1080, LENGTH = 0x0040 /* END=0x10BF, size 64 */
  INFOC            : ORIGIN = 0x1040, LENGTH = 0x0040 /* END=0x107F, size 64 */
  INFOD            : ORIGIN = 0x1000, LENGTH = 0x0040 /* END=0x103F, size 64 */
  ROM (rx)         : ORIGIN = 0xF800, LENGTH = 0x07E0 /* END=0xFFDF, size 2016 */
  VECT1            : ORIGIN = 0xFFE0, LENGTH = 0x0002
  VECT2            : ORIGIN = 0xFFE2, LENGTH = 0x0002
  VECT3            : ORIGIN = 0xFFE4, LENGTH = 0x0002
  VECT4            : ORIGIN = 0xFFE6, LENGTH = 0x0002
  VECT5            : ORIGIN = 0xFFE8, LENGTH = 0x0002
  VECT6            : ORIGIN = 0xFFEA, LENGTH = 0x0002
  VECT7            : ORIGIN = 0xFFEC, LENGTH = 0x0002
  VECT8            : ORIGIN = 0xFFEE, LENGTH = 0x0002
  VECT9            : ORIGIN = 0xFFF0, LENGTH = 0x0002
  VECT10           : ORIGIN = 0xFFF2, LENGTH = 0x0002
  VECT11           : ORIGIN = 0xFFF4, LENGTH = 0x0002
  VECT12           : ORIGIN = 0xFFF6, LENGTH = 0x0002
  VECT13           : ORIGIN = 0xFFF8, LENGTH = 0x0002
  VECT14           : ORIGIN = 0xFFFA, LENGTH = 0x0002
  VECT15           : ORIGIN = 0xFFFC, LENGTH = 0x0002
  RESETVEC         : ORIGIN = 0xFFFE, LENGTH = 0x0002
}

SECTIONS
{
  __interrupt_vector_1   : { KEEP (*(__interrupt_vector_1 )) } > VECT1
  __interrupt_vector_2   : { KEEP (*(__interrupt_vector_2 )) } > VECT2
  __interrupt_vector_3   : { KEEP (*(__interrupt_vector_3 )) KEEP (*(__interrupt_vector_port1)) } > VECT3
  __interrupt_vector_4   : { KEEP (*(__interrupt_vector_4 )) KEEP (*(__interrupt_vector_port2)) } > VECT4
  __interrupt_vector_5   : { KEEP (*(__interrupt_vector_5 )) KEEP (*(__interrupt_vector_usi)) } > VECT5
  __interrupt_vector_6   : { KEEP (*(__interrupt_vector_6 )) KEEP (*(__interrupt_vector_sd16)) } > VECT6
  __interrupt_vector_7   : { KEEP (*(__interrupt_vector_7 )) } > VECT7
  __interrupt_vector_8   : { KEEP (*(__interrupt_vector_8 )) } > VECT8
  __interrupt_vector_9   : { KEEP (*(__interrupt_vector_9 )) KEEP (*(__interrupt_vector_timera1)) } > VECT9
  __interrupt_vector_10  : { KEEP (*(__interrupt_vector_10)) KEEP (*(__interrupt_vector_timera0)) } > VECT10
  __interrupt_vector_11  : { KEEP (*(__interrupt_vector_11)) KEEP (*(__interrupt_vector_wdt)) } > VECT11
  __interrupt_vector_12  : { KEEP (*(__interrupt_vector_12)) } > VECT12
  __interrupt_vector_13  : { KEEP (*(__interrupt_vector_13)) } > VECT13
  __interrupt_vector_14  : { KEEP (*(__interrupt_vector_14)) } > VECT14
  __interrupt_vector_15  : { KEEP (*(__interrupt_vector_15)) KEEP (*(__interrupt_vector_nmi)) } > VECT15
  __reset_vector :
  {
    KEEP (*(__interrupt_vector_16))
    KEEP (*(__interrupt_vector_reset))
    KEEP (*(.resetvec))
  } > RESETVEC

  .rodata : {
    . = ALIGN(2);
    *(.plt)
    *(.rodata .rodata.* .gnu.linkonce.r.* .const .const:*)
    *(.rodata1)
    *(.eh_frame_hdr)
    KEEP (*(.eh_frame))
    KEEP (*(.gcc_except_table)) *(.gcc_except_table.*)
    PROVIDE (__preinit_array_start = .);
    KEEP (*(.preinit_array))
    PROVIDE (__preinit_array_end = .);
    PROVIDE (__init_array_start = .);
    KEEP (*(SORT(.init_array.*)))
    KEEP (*(.init_array))
    PROVIDE (__init_array_end = .);
    PROVIDE (__fini_array_start = .);
    KEEP (*(.fini_array))
    KEEP (*(SORT(.fini_array.*)))
    PROVIDE (__fini_array_end = .);
    LONG(0); /* Sentinel.  */

    /* gcc uses crtbegin.o to find the start of the constructors, so
       we make sure it is first.  Because this is a wildcard, it
       doesn't matter if the user does not actually link against
       crtbegin.o; the linker won't look for a file to match a
       wildcard.  The wildcard also means that it doesn't matter which
       directory crtbegin.o is in.  */
    KEEP (*crtbegin*.o(.ctors))

    /* We don't want to include the .ctor section from from the
       crtend.o file until after the sorted ctors.  The .ctor section
       from the crtend file contains the end of ctors marker and it
       must be last */
    KEEP (*(EXCLUDE_FILE (*crtend*.o ) .ctors))
    KEEP (*(SORT(.ctors.*)))
    KEEP (*(.ctors))

    KEEP (*crtbegin*.o(.dtors))
    KEEP (*(EXCLUDE_FILE (*crtend*.o ) .dtors))
    KEEP (*(SORT(.dtors.*)))
    KEEP (*(.dtors))
  } > ROM

  .text           :
  {
    . = ALIGN(2);
    PROVIDE (_start = .);
    KEEP (*(SORT(.crt_*)))
    *(.lowtext .text .stub .text.* .gnu.linkonce.t.* .text:*)
    KEEP (*(.text.*personality*))
    /* .gnu.warning sections are handled specially by elf32.em.  */
    *(.gnu.warning)
    *(.interp .hash .dynsym .dynstr .gnu.version*)
    PROVIDE (__etext = .);
    PROVIDE (_etext = .);
    PROVIDE (etext = .);
    . = ALIGN(2);
    KEEP (*(.init))
    KEEP (*(.fini))
    KEEP (*(.tm_clone_table))
  } > ROM

  .data : {
    . = ALIGN(2);
    PROVIDE (__datastart = .);

    KEEP (*(.jcr))
    *(.data.rel.ro.local) *(.data.rel.ro*)
    *(.dynamic)

    *(.data .data.* .gnu.linkonce.d.*)
    KEEP (*(.gnu.linkonce.d.*personality*))
    SORT(CONSTRUCTORS)
    *(.data1)
    *(.got.plt) *(.got)

    /* We want the small data sections together, so single-instruction offsets
       can access them all, and initialized data all before uninitialized, so
       we can shorten the on-disk segment size.  */
    . = ALIGN(2);
    *(.sdata .sdata.* .gnu.linkonce.s.* D_2 D_1)

    . = ALIGN(2);
    _edata = .;
    PROVIDE (edata = .);
    PROVIDE (__dataend = .);
  } > RAM AT>ROM

  /* Note that crt0 assumes this is a multiple of two; all the
     start/stop symbols are also assumed word-aligned.  */
  PROVIDE(__romdatastart = LOADADDR(.data));
  PROVIDE (__romdatacopysize = SIZEOF(.data));

  .bss : {
    . = ALIGN(2);
    PROVIDE (__bssstart = .);
    *(.dynbss)
    *(.sbss .sbss.*)
    *(.bss .bss.* .gnu.linkonce.b.*)
    . = ALIGN(2);
    *(COMMON)
    PROVIDE (__bssend = .);
  } > RAM
  PROVIDE (__bsssize = SIZEOF(.bss));

  .noinit (NOLOAD) : {
    . = ALIGN(2);
    PROVIDE (__noinit_start = .);
    *(.noinit)
    . = ALIGN(2);
    PROVIDE (__noinit_end = .);
    end = .;
  } > RAM

  .stack (ORIGIN (RAM) + LENGTH(RAM)) :
  {
    PROVIDE (__stack = .);
    *(.stack)
  }

  .infoA     : {} > INFOA              /* MSP430 INFO FLASH MEMORY SEGMENTS */
  .infoB     : {} > INFOB
  .infoC     : {} > INFOC
  .infoD     : {} > INFOD

  .MP430.attributes 0 :
  {
    KEEP (*(.MSP430.attributes))
    KEEP (*(.gnu.attributes))
    KEEP (*(__TI_build_attributes))
  }

  /* The rest are all not normally part of the runtime image.  */

  /* Stabs debugging sections.  */
  .stab          0 : { *(.stab) }
  .stabstr       0 : { *(.stabstr) }
  .stab.excl     0 : { *(.stab.excl) }
  .stab.exclstr  0 : { *(.stab.exclstr) }
  .stab.index    0 : { *(.stab.index) }
  .stab.indexstr 0 : { *(.stab.indexstr) }
  .comment       0 : { *(.comment) }
  /* DWARF debug sections.
     Symbols in the DWARF debugging sections are relative to the beginning
     of the section so we begin them at 0.  */
  /* DWARF 1 */
  .debug          0 : { *(.debug) }
  .line           0 : { *(.line) }
  /* GNU DWARF 1 extensions */
  .debug_srcinfo  0 : { *(.debug_srcinfo) }
  .debug_sfnames  0 : { *(.debug_sfnames) }
  /* DWARF 1.1 and DWARF 2 */
  .debug_aranges  0 : { *(.debug_aranges) }
  .debug_pubnames 0 : { *(.debug_pubnames) }
  /* DWARF 2 */
  .debug_info     0 : { *(.debug_info .gnu.linkonce.wi.*) }
  .debug_abbrev   0 : { *(.debug_abbrev) }
  .debug_line     0 : { *(.debug_line .debug_line.* .debug_line_end) }
  .debug_frame    0 : { *(.debug_frame) }
  .debug_str      0 : { *(.debug_str) }
  .debug_loc      0 : { *(.debug_loc) }
  .debug_macinfo  0 : { *(.debug_macinfo) }
  /* SGI/MIPS DWARF 2 extensions */
  .debug_weaknames 0 : { *(.debug_weaknames) }
  .debug_funcnames 0 : { *(.debug_funcnames) }
  .debug_typenames 0 : { *(.debug_typenames) }
  .debug_varnames  0 : { *(.debug_varnames) }
  /DISCARD/ : { *(.note.GNU-stack) }
}

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