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Hello World Assembly

I want to simulate the below ARM assembly program on uvision3.

AREA HelloW, CODE, READONLY
SWI_WriteC EQU &0
SWI_Exit EQU &11

ENTRY
START ADR r1,TEXT
LOOP  LDRB r0,[r1],#1
          CMP r0,#0
          SWINE SWI_WriteC
          BNE LOOP
          SWI SWI_Exit
TEXT  = "Hello,World!",&0a,&0d,0
          END

The target is LPC2129 but i just want to run it on the simulator. The problem is when i use the default startup.s file, i get the following error on build:
Build target 'Target 1'
linking...
HelloWorld.axf: Warning: L6665W: Neither Lib$$Request$$armlib Lib$$Request$$cpplib defined, not searching ARM libraries.
HelloWorld.axf: Error: L6218E: Undefined symbol __main (referred from startup.o).
HelloWorld.axf: Error: L6218E: Undefined symbol __use_two_region_memory (referred from startup.o).
Target not created

If i try to build the source without the startup, i get the following error:
Build target 'Target 1'
assembling Main.S...
linking...
HelloWorld.sct(7): error: L6236E: No section matches selector - no section to be FIRST/LAST.
"HelloWorld.axf" - 1 Error(s), 0 Warning(s).

How do i go about rectifiying this? Should i include the startup file eventhough i only want to simulate the code on KEIL ?

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