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[CM3]assembly language trouble

stupidMokey

CORE: STM32F103ZET6

Hi,Pros.

     Here Monkey comes agian

I have met a problem with my code,see below:

/* --------- code here --------- */
     .section .data
_sp_usart:
     .word     _stack_usart
_stack_usart:
     .space     0x100,     0
...     // other code here
/* --------- code end here --------- */
and I wrote a ldscript looks like this:
/* --------- code here --------- */
SECTIONS
{
     ...     // other code here
     . =0x20000000;
     .data : {*(.data)}
}
/* --------- code end here --------- */

But what I read from ADDRESS 0x20000000 is a strange number,something like 0x2Exxxxxx,out of the RAM region.

I have no idea for this,how this happens?Can someone please help me?

Message was edited by: stupidMokey

Parents
  • 0 in reply to Jens Bauer

    Actually,I had tried almost every step you pointed out above before I turn to here for help.

    The Map output is the same as I expect:

    /* ---------- ld Map output ---------- */

    Disassembly of section .data:

    20000000 <_sp_usart>:

    20000000:    20000004     andcs    r0, r0, r4

    20000004 <_stack_usart>:

        ...

    /* ---------- ld Map output end here ---------- */

    still,what I read from ADDRESS 0x20000000 is really the number "2e006816".

    So,I guess maybe it would be a special mechanism used in CM3,and,maybe I should mark it and search more details to figure it out.

    Very kind of you for help.

Reply
  • 0 in reply to Jens Bauer

    Actually,I had tried almost every step you pointed out above before I turn to here for help.

    The Map output is the same as I expect:

    /* ---------- ld Map output ---------- */

    Disassembly of section .data:

    20000000 <_sp_usart>:

    20000000:    20000004     andcs    r0, r0, r4

    20000004 <_stack_usart>:

        ...

    /* ---------- ld Map output end here ---------- */

    still,what I read from ADDRESS 0x20000000 is really the number "2e006816".

    So,I guess maybe it would be a special mechanism used in CM3,and,maybe I should mark it and search more details to figure it out.

    Very kind of you for help.

Children