diff options
Diffstat (limited to 'sysdeps/sparc/sparc32/elf')
| -rw-r--r-- | sysdeps/sparc/sparc32/elf/start.S | 86 | ||||
| -rw-r--r-- | sysdeps/sparc/sparc32/elf/start.c | 68 |
2 files changed, 86 insertions, 68 deletions
diff --git a/sysdeps/sparc/sparc32/elf/start.S b/sysdeps/sparc/sparc32/elf/start.S new file mode 100644 index 0000000000..8e01b30fc7 --- /dev/null +++ b/sysdeps/sparc/sparc32/elf/start.S @@ -0,0 +1,86 @@ +/* Startup code for elf32-sparc + Copyright (C) 1997 Free Software Foundation, Inc. + Contributed by Richard Henderson <richard@gnu.ai.mit.edu>, 1997. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <sysdep.h> + + + .section ".text" + .align 4 + .global _start + .type _start,#function +_start: + + /* Terminate the stack frame, and reserve space for functions to + drop their arguments. */ + mov %g0, %fp + sub %sp, 6*4, %sp + + /* Save %g1. When starting a binary via the dynamic linker, %g1 + 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. */ + + /* Do essential libc initialization (sp points to argc, argv, and envp) */ + call __libc_init_first + mov %g1, %l0 + + /* Now that we have the proper stack frame, register library termination + function, if there is any: */ + + cmp %l0, 0 + beq 1f + nop + call atexit + mov %l0, %o0 +1: + + /* Extract the arguments and environment as encoded on the stack. The + argument info starts after one register window (16 words) past the SP. */ + ld [%sp+22*4], %o0 + add %sp, 23*4, %o1 + sll %o0, 4, %o2 + add %o2, %o1, %o2 + sethi %hi(__environ), %g2 + add %o2, 4, %o2 + st %o2, [%g2+%lo(__environ)] + + mov %o0, %l0 /* tuck them away */ + mov %o1, %l1 + + /* Call _init, the entry point to our own .init section. */ + call _init + mov %o2, %l2 + + /* Register our .fini section with atexit. */ + sethi %hi(_fini), %o0 + call atexit + add %o0, %lo(_fini), %o0 + + /* Call the user's main and exit with its return value. */ + mov %l0, %o0 + mov %l1, %o1 + call main + mov %l2, %o2 + call exit + nop + + /* Die very horribly if exit returns. */ + unimp + + .size _start,.-_start diff --git a/sysdeps/sparc/sparc32/elf/start.c b/sysdeps/sparc/sparc32/elf/start.c deleted file mode 100644 index f1e80195ca..0000000000 --- a/sysdeps/sparc/sparc32/elf/start.c +++ /dev/null @@ -1,68 +0,0 @@ -/* Copyright (C) 1991, 1992, 1993, 1994, 1997 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public License as - published by the Free Software Foundation; either version 2 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#include <errno.h> -#include <stdlib.h> -#include <unistd.h> -#include <fcntl.h> - -extern char **__environ; - -extern void __libc_init_first __P ((int argc, char **argv, char **envp)); -extern int main __P ((int argc, char **argv, char **envp)); - -register long int sp asm("%sp"), fp asm("%fp"); - -void -_start (void) -{ - /* It is important that these be declared `register'. - Otherwise, when compiled without optimization, they are put on the - stack, which loses completely after we zero the FP. */ - register int argc; - register char **argv, **envp; - register long int g1 asm ("%g1"); - unsigned long int copy_g1 = g1; - - /* Unwind the frame built when we entered the function. */ - asm("restore"); - if (copy_g1) - atexit (copy_g1); - - /* And clear the frame pointer. */ - fp = 0; - - /* The argument info starts after one register - window (64 bytes) past the SP. */ - argc = ((int *) sp)[16]; - argv = (char **) &((int *) sp)[17]; - envp = &argv[argc + 1]; - __environ = envp; - - /* Allocate 24 bytes of stack space for the register save area. */ - sp -= 24; - __libc_init_first (argc, argv, envp); -#ifdef ELF_INIT_FINI - { - extern void _fini (void); - _init (); - atexit (_fini); - } -#endif - exit (main (argc, argv, envp)); -} |