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Forum: ARM programming with GCC/GNU tools Trouble using malloc on ARM (Yagarto)


Author: Jaime Aranguren (sanjaac)
Posted on:

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Hi,

I am using Yagarto tools for ARM development (AT91SAM7S64). Everything
seems to be OK, except that when I use malloc the returned pointer
points to 0x00000008 regardless of the amount of bytes that I want to
allocate. I have
read the newsgroups, but nothign seems to help.


I need your advice with my .ld file, in order to know what could be
messed / missing and how to fix it. Other suggestions are welcome too.


/
*----------------------------------------------------------------------- 
---­-
*/
/*-         ATMEL Microcontroller Software Support  -  ROUSSET  -
*/
/
*----------------------------------------------------------------------- 
---­-
*/
/* The software is delivered "AS IS" without warranty or condition of
any
*/
/* kind, either express, implied or statutory. This includes
without      */
/* limitation any warranty or condition with respect to
merchantability or
*/
/* fitness for any particular purpose, or against the infringements
of
*/
/* intellectual property rights of others.         */
/
*----------------------------------------------------------------------- 
---­-
*/
/*- File source          : GCC_FLASH.ld
*/
/*- Object               : Linker Script File for Flash Workspace
*/
/*- Compilation flag     : None
*/
/*-
*/
/*- 1.0 20/Oct/04 JPP    : Creation
*/
/
*----------------------------------------------------------------------- 
---­-
*/


/* slightly modified for the WinARM example - M.Thomas (not Atmel) */


/*
//*** <<< Use Configuration Wizard in Context Menu >>> ***
*/


/*
// <h> Memory Configuration
//   <h> Code (Read Only)
//     <o>  Start <0x0-0xFFFFFFFF>
//     <o1> Size  <0x0-0xFFFFFFFF>
//   </h>
//   <h> Data (Read/Write)
//     <o2> Start <0x0-0xFFFFFFFF>
//     <o3> Size  <0x0-0xFFFFFFFF>
//   </h>
//   <h> Top of Stack (Read/Write)
//     <o4> STACK <0x0-0xFFFFFFFF>
//   </h>
// </h>
*/


/* Memory Definitions */


/* mt change code origin from 0x00000000 */
MEMORY
{
  CODE (rx) : ORIGIN = 0x00100000, LENGTH = 0x00010000
  DATA (rw) : ORIGIN = 0x00200000, LENGTH = 0x00002800
  STACK (rw) : ORIGIN = 0x00202800,LENGTH = 0x00001800



}


/* Section Definitions */

SECTIONS
{
  /* first section is .text which is used for code */
  . = 0x0000000;
  .text : { *cstartup.o (.text) }>CODE =0
  .text :
  {
    *(.text)                   /* remaining code */


    *(.glue_7t) *(.glue_7)


  } >CODE =0


  . = ALIGN(4);


  /* .rodata section which is used for read-only data (constants) */


  .rodata :
  {
    *(.rodata)
  } >CODE


  . = ALIGN(4);


  _etext = . ;
  PROVIDE (etext = .);


  /* .data section which is used for initialized data */


  .data : AT (_etext)
  {
    _data = . ;
    *(.data)
    SORT(CONSTRUCTORS)
  } >DATA
  . = ALIGN(4);


  _edata = . ;
   PROVIDE (edata = .);


  /* .bss section which is used for uninitialized data */


  .bss :
  {
    __bss_start = . ;
    _bss_start_ = . ;
    *(.bss)
    *(COMMON)
  }
  . = ALIGN(4);
  _bss_end_ = . ;
  _bss_end_ = . ;
  _end = .;
    . = ALIGN(4);
   .int_data :
   {
   *(.internal_ram_top)
   }> STACK


  PROVIDE (end = .);


  /* 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_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) }



}


Regards.

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