diff options
Diffstat (limited to 'sysdeps/alpha/elf/start.S')
| -rw-r--r-- | sysdeps/alpha/elf/start.S | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/sysdeps/alpha/elf/start.S b/sysdeps/alpha/elf/start.S new file mode 100644 index 0000000000..c534d6987b --- /dev/null +++ b/sysdeps/alpha/elf/start.S @@ -0,0 +1,104 @@ +/* Startup code for Alpha/ELF. +Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc. +Contributed by Richard Henderson <rth@tamu.edu> + +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., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <sysdep.h> + + .text + .globl __start + .align 3 + .ent __start, 0 +__start: + .frame fp, 0, zero + mov zero, fp + br gp, 1f +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 + + /* Do essential libc initialization (sp points to argc, argv, and envp) */ + jsr ra, __libc_init_first + 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 + +#ifdef HAVE_INITFINI + /* 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) +#else + /* initialize constructors: */ + jsr ra, __main + ldgp gp, 0(ra) +#endif + mov s0, a0 + mov s1, a1 + mov s2, a2 + + /* Call the user's main and exit with its return value. */ + 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 +END(__start) + +/* Define a symbol for the first piece of initialized data. */ + .data + .globl __data_start +__data_start: + .long 0 + +#ifdef __ELF__ + .size __data_start, 4 + .type __data_start, @object +#endif + +weak_alias(__data_start, data_start) |