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(_start): Let __libc_start_main do most of the init stuff.

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This commit is contained in:
Ulrich Drepper 1998-03-31 23:18:03 +00:00
parent 161756fe4f
commit f709e93784
1 changed files with 16 additions and 48 deletions
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64
sysdeps/alpha/elf/start.S
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@ -1,5 +1,5 @@
/* Startup code for Alpha/ELF.
Copyright (C) 1993, 1995, 1996, 1997 Free Software Foundation, Inc.
Copyright (C) 1993, 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Richard Henderson <rth@tamu.edu>
@ -31,56 +31,24 @@ _start:
1: ldgp gp, 0(gp)
.prologue 1
/* Save v0. When starting a binary via the dynamic linker, s0
contains the address of the shared library termination function,
which we will register below with atexit() to be called by exit().
If we are statically linked, this will be NULL. */
mov v0, s0
/* Load address of the user's main function. */
lda a0, main
/* Do essential libc initialization (sp points to argc, argv, and envp) */
jsr ra, __libc_init_first
ldl a1, 0(sp) /* get argc */
lda a2, 8(sp) /* get argv */
/* Load address of our own entry points to .fini and .init. */
lda a3, _init
lda a4, _fini
/* Store address of the shared library termination function. */
mov v0, a5
/* Call the user's main function, and exit with its value.
But let the libc call main. */
jsr ra, __libc_start_main
ldgp gp, 0(ra)
/* Now that we have the proper stack frame, register library termination
function, if there is any: */
beq s0, 1f
mov s0, a0
jsr ra, atexit
ldgp gp, 0(ra)
1:
/* Extract the arguments and environment as encoded on the stack. */
ldl a0, 0(sp) /* get argc */
lda a1, 8(sp) /* get argv */
s8addq a0, a1, a2 /* get envp */
addq a2, 8, a2
stq a2, _environ
mov a0, s0 /* tuck them away */
mov a1, s1
mov a2, s2
/* Call _init, the entry point to our own .init section. */
jsr ra, _init
ldgp gp, 0(ra)
/* Register our .fini section with atexit. */
lda a0, _fini
jsr ra, atexit
ldgp gp, 0(ra)
/* Call the user's main and exit with its return value. */
mov s0, a0
mov s1, a1
mov s2, a2
jsr ra, main
ldgp gp, 0(ra)
mov v0, a0
jsr ra, exit
/* Die very horribly if exit returns. Call_pal hlt is callable from
kernel mode only; this will result in an illegal instruction trap. */
call_pal 0