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 Post subject: specify an address of a function (or a variable)
PostPosted: Tue Oct 22, 2013 12:16 pm 
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Joined: Fri Mar 04, 2011 9:36 pm
Posts: 500
Here is an example to specify an address of a function,
or a variable.

sag code:
Code:
USER_SECTIONS .mysection0, .mysection1, .mysection2
ROM 0x0
{
  RAM 0x0
    {
      STACK = 0x00020000
      * (+RO)
    }
  MYRAM0 0x00014000
    {
      * (.mysection0)     
    }
  MYRAM1 0x00018000
    {
      * (.mysection1)
    }
  MYRAM2 0x0001c000
    {
      * (.mysection2)
    }
  RAM1 0x00010000
   {
      LOADADDR __data_lmastart
      ADDR __data_start
      * (+RW, +ZI)
    }
}



Execute nds_ldsag.exe
Code:
hylai@APC002 /cygdrive/e/Andestech/AndeSight201MCU/mcu/workspace/section_example

$ /cygdrive/e/Andestech/AndeSight201MCU/utils/nds_ldsag.exe sections.sag -o sec
tions.ld
The output file is placed "sections.ld"



C code: (partial)

Code:
#include <stdio.h>
void functionAA (void) __attribute__((section(".mysection0")));

int gdata1 __attribute__((section(".mysection1"))) = 0x1234;
long long gdata2 __attribute__((section(".mysection2"))) = 0xabcdabcd;

void
functionAA (void)
{
   int i;
   puts("/ * Enter functionAA function */\n");

   return;
}


Result: (From objdump)
Sections:
Idx Name Size VMA LMA File off Algn
0 .nds32_init 00000002 00000000 00000000 00001000 2**0
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .init 00000004 00000002 00000002 00001002 2**0
CONTENTS, ALLOC, LOAD, READONLY, CODE
2 .text 00000174 00000008 00000008 00001008 2**2
CONTENTS, ALLOC, LOAD, READONLY, CODE
3 .rodata 00000024 0000017c 0000017c 0000117c 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
4 .mysection0 0000000c 00014000 000001a0 00002000 2**1
CONTENTS, ALLOC, LOAD, READONLY, CODE
5 .mysection1 00000004 00018000 000001ac 00003000 2**2
CONTENTS, ALLOC, LOAD, DATA
6 .mysection2 00000008 0001c000 000001b0 00004000 2**3
CONTENTS, ALLOC, LOAD, DATA

Download this example:
Attachment:
section_example.zip [32.53 KiB]
Downloaded 288 times


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