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Diffstat (limited to 'sysdeps/sparc/elf/start.S')
| -rw-r--r-- | sysdeps/sparc/elf/start.S | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/sysdeps/sparc/elf/start.S b/sysdeps/sparc/elf/start.S deleted file mode 100644 index db407d7bae..0000000000 --- a/sysdeps/sparc/elf/start.S +++ /dev/null @@ -1,112 +0,0 @@ -/* Startup code compliant to the ELF SPARC ABI. - Copyright (C) 1996, 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 the canonical entry point, usually the first thing in the text - segment. The SVR4/SPARC ABI (NOTE: I don't actually have it) says that - when the entry point runs, most registers' values are unspecified, - except for: - - %g1 Contains a function pointer to be registered with `atexit'. - This is how the dynamic linker arranges to have DT_FINI - functions called for shared libraries that have been loaded - before this code runs. - - %sp The stack contains the arguments and environment: - 0(%sp) argc - 4(%sp) argv[0] - ... - (4*argc)(%sp) NULL - (4*(argc+1))(%sp) envp[0] - ... - NULL -*/ - - .text - .align 16 - .global _start -_start: - /* %g1 contains the address of the shared library termination - function, which we will register with `atexit' to be called by - `exit'. I suspect that on some systems, and when statically - linked, this will not be set by anything to any function - pointer; hopefully it will be zero so we don't try to call - random pointers. */ - orcc %g1, %g0, %o0 /* Move %g1 to %o0 while testing it. */ - be nofini - - /* In delay slot: clear the frame pointer. The ABI suggests this - be done, to mark the outermost frame obviously. */ - clr %fp - - /* Call atexit, argument was set in %o0 above. */ - call atexit - nop -nofini: - - /* We will use some local variables in registers below. %g1 and - the %oN registers are call-clobbered, so we can't just use them. */ -#define ARGC %l0 -#define ARGV %l1 -#define ENVP %l2 -#define TMP %l3 - - /* Do essential libc initialization. In statically linked - programs under the GNU Hurd, this is what sets up the - arguments on the stack for the code below. */ - call __libc_init_first - sethi %hi(_environ), TMP /* In delay slot: prepare to use &_environ. */ - - /* Extract the arguments and environment as encoded on the stack - and save them in local variables. */ - ld [%sp + 64], ARGC /* After the register save area, ARGC. */ - add %sp, 64+4, ARGV /* Next, the ARGV elements. */ - /* After ARGC words that are the ARGV elements, and a zero word, - are the ENVP elements. Do ENVP = &ARGV[ARGC + 1]. */ - add ARGC, 1, ENVP - sll ENVP, 2, ENVP - add ARGV, ENVP, ENVP - /* Store ENVP in the global variable `_environ'. */ - ld [TMP + %lo(_environ)], ENVP - - /* Call `_init', which is the entry point to our own `.init' - section; and register with `atexit' to have `exit' call - `_fini', which is the entry point to our own `.fini' section. */ - call _init - sethi %hi(_fini), TMP /* In delay slot of call. */ - or TMP, %lo(_fini), %o0 /* Argument to atexit is &_fini. */ - call atexit - nop - - /* Call the user's main function, and exit with its value. */ - mov ARGC, %o0 - mov ARGV, %o1 - call main - mov ENVP, %o2 - - call exit /* This should never return. */ - nop - unimp 0 /* Crash if somehow it does return. */ - -/* Define a symbol for the first piece of initialized data. */ - .data - .global __data_start -__data_start: - .long 0 - .weak data_start - data_start = __data_start |