assembly only project

[MFlamer]

I'm having trouble getting a simple project of 1 file of assembly to build. This the code and error.



.globl _start
_start:
ldc r1, 100
notmain:
sub r1,r1,1
bt r1, notmain

ldc r3,0x4000
shl r3,r3,4
setc res[r3],0x8
ldc r1,0x6
setc res[r1],0x8
// ldc r2, 8
// setd res[r1], r2
setc res[r1],0xf

top:
ldc r0, 0x8
out res[r3], r0
ldc r0, 0x4
out res[r3], r0
ldc r0, 0x2
out res[r3], r0
ldc r0, 0x1
out res[r3], r0
ldc r0, 0x2
out res[r3], r0
ldc r0, 0x4
out res[r3], r0
bu top


**** Build of configuration Debug for project test ****

xmake CONFIG=Debug all
No modules used.
Checking xmos.com for board support package: XC-1
Installed BSP for target XC-1
Creating dependencies for test.S
Creating test_Debug.xe
../src/test.S: Error: Multiple definition of '_start'
crt1.S: Error: first defined here
xmake[1]: *** [bin/Debug/test_Debug.xe] Error 1
xmake: *** [bin/Debug/test_Debug.xe] Error 2

What am I missing? Thanks.

I just found the xcc comand line manual, I think this will help get me going....

[mon2]

Please post the error and details on how you are compiling this source file.

[MFlamer]

I added the error output to the original post. Thanks.

[mon2]

Try the following:

1) Create a new project -> change the target hardware to XC-1A

2) cut & paste the text below into the default .xc file. Then save as same file name but with .s suffix.

3) Then manually delete the empty .xc file leaving only the .s assembler source file.

4) Build the project.

**** Build of configuration Debug for project first_assembler ****

xmake CONFIG=Debug all
No modules used.
Build Complete


Credit goes to this thread:
http://www.xcore.com/forum/viewtopic.ph ... =assembler

Code: Select all

   .text
   .file "first_assembler.S"

   .globl main

   .globl main.nstackwords
   .linkset main.nstackwords, 0

main:
_start:
 entsp   0
 ldc r1, 100
notmain:
 sub r1,r1,1
 bt r1, notmain

 ldc r3,0x4000
 shl r3,r3,4
 setc res[r3],0x8
 ldc r1,0x6
 setc res[r1],0x8
 setc res[r1],0xf

top:
 ldc r0, 0x8
 out res[r3], r0
 ldc r0, 0x4
 out res[r3], r0
 ldc r0, 0x2
 out res[r3], r0
 ldc r0, 0x1
 out res[r3], r0
 ldc r0, 0x2
 out res[r3], r0
 ldc r0, 0x4
 out res[r3], r0
 bu top

[MFlamer]

Built first try. Thanks. I'll readup on the changes to the file and see what I was missing. Probably the "main:" label.