diff options
Diffstat (limited to 'sysdeps/powerpc/elf/start.c')
| -rw-r--r-- | sysdeps/powerpc/elf/start.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/sysdeps/powerpc/elf/start.c b/sysdeps/powerpc/elf/start.c new file mode 100644 index 0000000000..9b1cf1c026 --- /dev/null +++ b/sysdeps/powerpc/elf/start.c @@ -0,0 +1,111 @@ +/* Startup code compliant to the ELF PowerPC ABI. + Copyright (C) 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. */ + +/* This is SVR4/PPC ABI compliant, and works under Linux when + statically linked. */ + +#include <unistd.h> +#include <stdlib.h> + +/* Just a little assembler stub before gcc gets its hands on our + stack pointer... */ +asm ("\ + .text + .globl _start +_start: + # save the stack pointer, in case we're statically linked under Linux + mr 8,1 + # set up an initial stack frame, and clear the LR + addi 1,1,-16 + clrrwi 1,1,4 + li 0,0 + stw 0,0(1) + mtlr 0 + # set r13 to point at the 'small data area' + lis 13,_SDA_BASE_@ha + addi 13,13,_SDA_BASE_@l + # and continue below. + b __start1 +"); + +/* Define a symbol for the first piece of initialized data. */ +int __data_start = 0; +weak_alias (__data_start, data_start) + +/* these probably should go, at least go somewhere else + (sysdeps/mach/something?). */ +void (*_mach_init_routine) (void); +void (*_thread_init_routine) (void); + +void __libc_init_first (int argc, char **argv, char **envp); +int main (int argc, char **argv, char **envp, void *auxvec); +#ifdef HAVE_INITFINI +void _init (void); +void _fini (void); +#endif + + +static void __start1(int argc, char **argv, char **envp, + void *auxvec, void (*exitfn) (void), char **arguments) + __attribute__ ((unused)); +static void +__start1(int argc, char **argv, char **envp, + void *auxvec, void (*exitfn) (void), + char **arguments) +{ + /* the PPC SVR4 ABI says that the top thing on the stack will + be a NULL pointer, so if not we assume that we're being called + as a statically-linked program by Linux. */ + int abi_compliant_startup = *arguments == NULL; + + if (!abi_compliant_startup) + { + argc = *(int *) arguments; + argv = arguments+1; + envp = argv+argc+1; + auxvec = envp; + while (auxvec != NULL) + auxvec++; + auxvec++; + exitfn = NULL; + } + + if (exitfn != NULL) + atexit (exitfn); + + /* libc init routine, in case we are statically linked + (otherwise ld.so will have called it when it loaded libc, but + calling it twice doesn't hurt). */ + __libc_init_first (argc, argv, envp); + +#ifdef HAVE_INITFINI + /* ELF constructors/destructors */ + atexit (_fini); + _init (); +#endif + + /* Stuff so we can build Mach/Linux executables (like vmlinux). */ + if (_mach_init_routine != 0) + _mach_init_routine (); + if (_thread_init_routine != 0) + _thread_init_routine (); + + /* the rest of the program */ + exit (main (argc, argv, envp, auxvec)); +} |