crt1.S start code

[Lei Sun]

Sorry, I meant,the 
" mov a3, sp" statement should be "ldr a3, [sp]"

comments?

Thanks!
lei
  ----- Original Message ----- 
  From: Lei Sun 
  To: uclibc at uclibc.org 
  Sent: Friday, December 23, 2005 3:53 PM
  Subject: crt1.S start code


  Hi :
     I was trying to debug my application built with uClibc-0.9.28, for xscale based platform. I couldn't get correct argv passing into my main program, so I dug into the crt1.S code, (in sysdeps/linux/arm/crt1.S)

  _start:

  /* clear the frame pointer and link registers */
      mov fp, #0
      mov lr, #0
      /* pop argc off the stack and save a pointer to argv */
      ldr a2, [sp], #4
      mov a3, sp

  Here, shouldn't the a3 be the actual argv? therefore it should be   
      mov a3, [sp] 

  in linux/asm/proc-armv/processor.h , start_thread is defined such that

  regs->ARM_r0=stack[0]
  regs->ARM_r1=stack[1].

  so clearly, argv is store in the start_stack + 4 , 

  Thank you!
  lei 



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