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authorRoland McGrath <roland@gnu.org>2004-10-24 19:23:43 +0000
committerRoland McGrath <roland@gnu.org>2004-10-24 19:23:43 +0000
commit89c235754c8986b6394a969e92f75ba63ecbbf7c (patch)
tree880ae7f5c447ad63bc171148fc4b90ff102eecb2 /sysdeps/cris/elf/start.S
parent8aeb5058b6457cf9ca8d76026cbb60ca07015570 (diff)
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-/* Startup code compliant to the ELF CRIS ABI (to-be-written).
- Copyright (C) 2001, 2002 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 Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- In addition to the permissions in the GNU Lesser General Public
- License, the Free Software Foundation gives you unlimited
- permission to link the compiled version of this file with other
- programs, and to distribute those programs without any restriction
- coming from the use of this file. (The GNU Lesser General Public
- License restrictions do apply in other respects; for example, they
- cover modification of the file, and distribution when not linked
- into another program.)
-
- Note that people who make modified versions of this file are not
- obligated to grant this special exception for their modified
- versions; it is their choice whether to do so. The GNU Lesser
- General Public License gives permission to release a modified
- version without this exception; this exception also makes it
- possible to release a modified version which carries forward this
- exception.
-
- 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
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-#include <sysdep.h>
-
-/* This is the canonical entry point, usually the first thing in the text
- segment. When the entry point runs, most registers' values are
- unspecified, except for:
-
- R10 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:
- [SP] argc
- [SP+4] argv[0]
- ...
- [SP+4*argc] NULL
- [SP+4*(argc+1)] envp[0]
- ...
- NULL
-*/
-
- .syntax no_register_prefix
-
- .text
- .globl _start
- .type _start,@function
-_start:
- /* Clear the frame pointer, to mark the outermost frame. */
- moveq 0,r8
-
- /* Move the shared library termination function to the right place
- for __libc_main. */
- move.d r10,r9
-
- /* Extract the arguments as encoded on the stack and set up the
- arguments for `main': argc, argv. envp will be determined
- later in __libc_start_main. */
-
- /* Get the argument count. */
- move.d [sp],r11
-
- /* Store the stack pointer as end of stack. We overwrite
- the incoming argc. */
- move.d sp,[sp]
-
- /* The argument vector starts just after the argument count. */
- move.d sp,r12
- addq 4,r12
-
- /* There are seven arguments to __libc_start_main:
- r10: main - Address of it.
- r11: argc
- r12: argv
- r13: init - Function to call.
-
- [sp]: fini - Function to register with atexit.
- [sp+4]: rtld_fini - Another function to register with atexit.
- [sp+8]: stack_end - Top of stack (actually same as argv).
-
- The last two are passed on stack. */
-
- /* Store the fini function coming from the dynamic loader. */
- push r9
-
- /* Get the addresses of our own entry points to `.fini' and
- `.init'. */
-
-#ifdef __PIC__
- /* If for some reason this program is compiled as PIC, set up R0. */
- move.d pc,r0
- sub.d .:GOTOFF,r0
-
- move.d __libc_csu_init:PLTG,r13
- add.d r0,r13
- move.d __libc_csu_fini:PLTG,r9
- add.d r0,r9
- move.d main:PLTG,r10
- add.d r0,r10
-#else
- move.d __libc_csu_init,r13
- move.d __libc_csu_fini,r9
- move.d main,r10
-#endif
- push r9
-
- /* Call the user's main function, and exit with its value. But
- let the libc call main. */
- PLTCALL (__libc_start_main)
-
- /* Crash if somehow `exit' does return. We have at least 8192
- invalid addresses to choose from. */
- test.d [6502]
-
- /* Stop the unstoppable. */
-0:
- ba 0b
- nop
-
-/* Define a symbol for the first piece of initialized data. */
- .data
- .globl __data_start
-__data_start:
- .long 0
- .weak data_start
- data_start = __data_start