At 05:13 PM 12/16/03 -0500, you wrote:
>At 11:05 PM 12/16/03 +0100, you wrote:
> >Has someone in the group already created such a linker script for the
> >LPC2106 ?
> >I started to modify the example, but it seems to be a non trivial task,
> >without knowing the right syntax of a linker script.
> >
> >I think, what i am searching for is a "hello world" for LPC2106 with gnu arm
> >toolchain from source to hex-file...
> >Leon: This is perhaps worth uploading to your website ?
> >
> >Greetings,
>One linker script coming up.
Oh and the startup that goes with it.
/* Sample initialization file */
.extern main
.extern exit
/* .text is used instead of .section .text so it works with
arm-aout too. */
.text
.code 32
.align 0
.extern __bss_beg__
.extern __bss_end__
.extern __stack_end__
.extern __data_beg__
.extern __data_end__
.extern __data+beg_src__
.global start
/* .global _mainCRTStartup */
/* .global _start */
.global endless_loop
start:
_start:
_mainCRTStartup:
/* Start by setting up a stack */
/* Set up the stack pointer to end of bss */
ldr r3, .LC6
mov sp, r3
sub sl, sp, #512 /* Still assumes 512 bytes below sl */
mov a2, #0 /* Second arg: fill value */
mov fp, a2 /* Null frame pointer */
mov r7, a2 /* Null frame pointer for Thumb */
/* ldr r1, #__bss_beg__*/ /* First arg: start of
memory block */
ldr r1, .LC1 /* First arg: start of
memory block */
/* ldr r3, #__bss_end__*/ /* Second arg: end of memory block */
ldr r3, .LC2 /* Second arg: end of
memory block */
subs r3, r3, r1 /* Third arg: length of
block */
beq .end_clear_loop
mov r2, #0
.clear_loop:
strb r2, [r1], #1
subs r3, r3, #1
bgt .clear_loop
.end_clear_loop:
ldr r1, .LC3 /* First arg: start of
memory block */
ldr r2, .LC4 /* Second arg: end of memory block */
ldr r3, .LC5
subs r3, r3, r1 /* Third arg: length of block */
beq .end_set_loop
.set_loop:
ldrb r4, [r2], #1
strb r4, [r1], #1
subs r3, r3, #1
bgt .set_loop
.end_set_loop:
mov r0, #0 /* no arguments */
mov r1, #0 /* no argv either */
bl main
endless_loop:
b endless_loop
bl exit /* Should not return */
/* For Thumb, constants must be after the code since only
positive offsets are supported for PC relative addresses. */
.align 0
.LC1:
.word __bss_beg__
.LC2:
.word __bss_end__
.LC3:
.word __data_beg__
.LC4:
.word __data_beg_src__
.LC5:
.word __data_end__
.LC6:
.word __stack_end__
.section .startup,"ax"
.code 32
.align 0
b start
b undefined_instruction_exception
b software_interrupt_exception
b prefetch_abort_exception
b data_abort_exception
b reserved_exception
b interrupt_exception
b fast_interrupt_exception
Robert
" 'Freedom' has no meaning of itself. There are always restrictions,
be they legal, genetic, or physical. If you don't believe me, try to
chew a radio signal. "
Kelvin Throop, III