1997-06-30 06:05:27 +08:00
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/* Startup code for elf64-sparc
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Copyright (C) 1997 Free Software Foundation, Inc.
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Contributed by Richard Henderson <richard@gnu.ai.mit.edu>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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1997-07-07 06:02:42 +08:00
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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1997-06-30 06:05:27 +08:00
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#include <sysdep.h>
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.section ".text"
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.align 4
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.global _start
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.type _start,#function
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_start:
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/* First order of business is to load %g4 with our base address. */
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sethi %uhi(_start), %g4
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or %g4, %ulo(_start), %g4
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sllx %g4, 32, %g4
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/* Terminate the stack frame, and reserve space for functions to
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drop their arguments. */
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mov %g0, %fp
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sub %sp, 6*8, %sp
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/* Save %g1. When starting a binary via the dynamic linker, %g1
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contains the address of the shared library termination function,
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which we will register below with atexit() to be called by exit().
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If we are statically linked, this will be NULL. */
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/* Do essential libc initialization (sp points to argc, argv, and envp) */
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call __libc_init_first
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mov %g1, %l0
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/* Now that we have the proper stack frame, register library termination
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function, if there is any: */
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brz,pn %l0, 1f
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nop
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call atexit
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mov %l0, %o0
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1:
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/* Extract the arguments and environment as encoded on the stack. The
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argument info starts after one register window (16 words) past the SP,
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plus the bias we added, plus the magic v9 STACK_BIAS. */
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ldx [%sp+STACK_BIAS+22*8], %o0
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add %sp, STACK_BIAS+23*8, %o1
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sllx %o0, 3, %o2
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add %o2, %o1, %o2
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sethi %hi(__environ), %g2
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add %o2, 8, %o2
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add %g2, %g4, %g2
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stx %o2, [%g2+%lo(__environ)]
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mov %o0, %l0 /* tuck them away */
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mov %o1, %l1
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/* Call _init, the entry point to our own .init section. */
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call _init
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mov %o2, %l2
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/* Register our .fini section with atexit. */
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sethi %hi(_fini), %o0
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add %o0, %g4, %o0
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call atexit
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add %o0, %lo(_fini), %o0
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/* Call the user's main and exit with its return value. */
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mov %l0, %o0
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mov %l1, %o1
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call main
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mov %l2, %o2
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call exit
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nop
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/* Die very horribly if exit returns. */
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illtrap 0
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.size _start,.-_start
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