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tkernel_2/lib/crt/crttk/src/sysdepend/tef_em1d/asmstartup.Sbare sourcepermlink (0.00 seconds)

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    1: /*
    2:  *----------------------------------------------------------------------
    3:  *    T-Kernel 2.0 Software Package
    4:  *
    5:  *    Copyright 2011 by Ken Sakamura.
    6:  *    This software is distributed under the latest version of T-License 2.x.
    7:  *----------------------------------------------------------------------
    8:  *
    9:  *    Released by T-Engine Forum(http://www.t-engine.org/) at 2011/05/17.
   10:  *    Modified by TRON Forum(http://www.tron.org/) at 2015/06/01.
   11:  *
   12:  *----------------------------------------------------------------------
   13:  */
   14: 
   15: /*
   16:  *      @(#)asmstartup.S (crttk/EM1-D512)
   17:  *
   18:  *      Driver/manager startup
   19:  */
   20: 
   21: #include <machine.h>
   22: #include <tk/asm.h>
   23: 
   24:         .text
   25:         .balign        4
   26:         .globl Csym(_C_startup)
   27:         .type  Csym(_C_startup), %function
   28: Csym(_C_startup):
   29:         cmp    r0, #0
   30:         blt    l_noinit           // Initialization sequence is performed only when ac >= 0
   31: 
   32:         ldr    r4, =__data_org            // When data area does not need to be moved,
   33:         ldr    r5, =__data_start  // OS loads
   34:         cmp    r4, r5
   35:         beq    l_noinit
   36: 
   37:         ldr    r6, =_edata                // initialize data area
   38:         cmp    r5, r6
   39:         bhs    nocopy_data
   40:   copy_data:
   41:         ldr    ip, [r4], #4
   42:         str    ip, [r5], #4
   43:         cmp    r5, r6
   44:         blo    copy_data
   45:   nocopy_data:
   46: 
   47:         ldr    ip, =0                     // clear bss area
   48:         ldr    r4, =__bss_start
   49:         ldr    r5, =_end
   50:         cmp    r4, r5
   51:         bhs    nobss
   52:   clrbss:
   53:         str    ip, [r4], #4
   54:         cmp    r4, r5
   55:         blo    clrbss
   56:   nobss:
   57: 
   58:   l_noinit:
   59:         b      Csym(_P_startup)