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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [libgloss/] [iq2000/] [crt0.S] - Blame information for rev 148

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1 148 jeremybenn
##==============================================================================
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##
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##      crt0.S
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##
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##      IQ2000 startup code
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##
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##==============================================================================
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##
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## Copyright (c) 2000, Cygnus Solutions, A Red Hat Company
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##
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## The authors hereby grant permission to use, copy, modify, distribute,
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## and license this software and its documentation for any purpose, provided
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## that existing copyright notices are retained in all copies and that this
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## notice is included verbatim in any distributions. No written agreement,
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## license, or royalty fee is required for any of the authorized uses.
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## Modifications to this software may be copyrighted by their authors
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## and need not follow the licensing terms described here, provided that
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## the new terms are clearly indicated on the first page of each file where
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## they apply.
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##
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##------------------------------------------------------------------------------
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        .file   "crt0.S"
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##------------------------------------------------------------------------------
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## Startup code
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        .section .text
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        .global _start
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_start:
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        lui %29,%hi(__stack)
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        ori %29,%29,%lo(__stack)
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        lui %24,%hi(_edata)     # get start of bss
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        ori %24,%24,%lo(_edata)
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        lui %25,%hi(_end)       # get end of bss
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        ori %25,%25,%lo(_end)
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        beq     %24,%25,.L0     # check if end and start are the same
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                                # do nothing if no bss
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.L1:
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        sb %0,0(%24)            #  clear a byte and bump pointer
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        addi %24,%24,1
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        bne %24,%25,.L1
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        nop
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.L0:
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        jal  _main              # call _main to run ctors/dtors
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        nop
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        xor %4,%4,%4
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        jal main                # call main program
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        xor %5,%5,%5
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        jal exit                # all done, no need to return or
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        or %4,%0,%2             # exit with main's return value
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        .section .data
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        .global __dso_handle
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        .weak __dso_handle
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__dso_handle:
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        .long   0

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