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181 lines
4.8 KiB
HTML
181 lines
4.8 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>crt0.S (Embed with GNU)</title>
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<meta name="description" content="crt0.S (Embed with GNU)">
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<meta name="keywords" content="crt0.S (Embed with GNU)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="leds_002ec.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Code-Listings.html#Code-Listings" rel="up" title="Code Listings">
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<link href="glue_002ec.html#glue_002ec" rel="next" title="glue.c">
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<link href="idp_002eld.html#idp_002eld" rel="prev" title="idp.ld">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.indentedblock {margin-right: 0em}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.smalllisp {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="crt0_002eS"></a>
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<div class="header">
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<p>
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Next: <a href="glue_002ec.html#glue_002ec" accesskey="n" rel="next">glue.c</a>, Previous: <a href="idp_002eld.html#idp_002eld" accesskey="p" rel="prev">idp.ld</a>, Up: <a href="Code-Listings.html#Code-Listings" accesskey="u" rel="up">Code Listings</a> [<a href="leds_002ec.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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</div>
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<hr>
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<a name="crt0_002eS-_002d-The-startup-file"></a>
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<h3 class="section">A.2 crt0.S - The startup file</h3>
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<div class="example">
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<pre class="example">/*
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* crt0.S -- startup file for m68k-coff
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*
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*/
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.title "crt0.S for m68k-coff"
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/* These are predefined by new versions of GNU cpp. */
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#ifndef __USER_LABEL_PREFIX__
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#define __USER_LABEL_PREFIX__ _
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#endif
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#ifndef __REGISTER_PREFIX__
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#define __REGISTER_PREFIX__
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#endif
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/* ANSI concatenation macros. */
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#define CONCAT1(a, b) CONCAT2(a, b)
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#define CONCAT2(a, b) a ## b
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/* Use the right prefix for global labels. */
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#define SYM(x) CONCAT1 (__USER_LABEL_PREFIX__, x)
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/* Use the right prefix for registers. */
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#define REG(x) CONCAT1 (__REGISTER_PREFIX__, x)
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#define d0 REG (d0)
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#define d1 REG (d1)
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#define d2 REG (d2)
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#define d3 REG (d3)
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#define d4 REG (d4)
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#define d5 REG (d5)
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#define d6 REG (d6)
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#define d7 REG (d7)
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#define a0 REG (a0)
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#define a1 REG (a1)
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#define a2 REG (a2)
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#define a3 REG (a3)
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#define a4 REG (a4)
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#define a5 REG (a5)
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#define a6 REG (a6)
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#define fp REG (fp)
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#define sp REG (sp)
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/*
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* Set up some room for a stack. We just grab a chunk of memory.
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*/
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.set stack_size, 0x2000
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.comm SYM (stack), stack_size
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/*
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* Define an empty environment.
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*/
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.data
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.align 2
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SYM (environ):
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.long 0
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.align 2
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.text
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.global SYM (stack)
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.global SYM (main)
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.global SYM (exit)
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/*
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* This really should be __bss_start, not SYM (__bss_start).
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*/
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.global __bss_start
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/*
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* start -- set things up so the application will run.
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*/
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SYM (start):
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link a6, #-8
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moveal #SYM (stack) + stack_size, sp
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/*
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* zerobss -- zero out the bss section
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*/
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moveal #__bss_start, a0
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moveal #SYM (end), a1
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1:
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movel #0, (a0)
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leal 4(a0), a0
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cmpal a0, a1
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bne 1b
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/*
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* Call the main routine from the application to get it going.
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* main (argc, argv, environ)
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* We pass argv as a pointer to NULL.
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*/
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pea 0
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pea SYM (environ)
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pea sp@(4)
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pea 0
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jsr SYM (main)
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movel d0, sp@-
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/*
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* _exit -- Exit from the application. Normally we cause a user trap
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* to return to the ROM monitor for another run.
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*/
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SYM (exit):
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trap #0
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</pre></div>
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<hr>
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<div class="header">
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<p>
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Next: <a href="glue_002ec.html#glue_002ec" accesskey="n" rel="next">glue.c</a>, Previous: <a href="idp_002eld.html#idp_002eld" accesskey="p" rel="prev">idp.ld</a>, Up: <a href="Code-Listings.html#Code-Listings" accesskey="u" rel="up">Code Listings</a> [<a href="leds_002ec.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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</div>
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</body>
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</html>
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