| /* Startup code for elf{32,64}-sparc |
| Copyright (C) 1997, 1998, 2002, 2004 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| 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 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. */ |
| |
| /* Originally based on glibc's sysdeps/sparc/sparc{32,64}/elf/start.S */ |
| |
| #include <features.h> |
| #include <bits/wordsize.h> |
| |
| /* macro out the 32 / 64 bit differences */ |
| #if __WORDSIZE == 32 |
| # define STACK_BIAS 0 |
| # define ELE_SIZE 4 |
| # define LD ld |
| #else |
| # define STACK_BIAS 2047 /* see glibc/sysdeps/unix/sysv/linux/sparc/sparc64/sysdep.h */ |
| # define ELE_SIZE 8 |
| # define LD ldx |
| #endif |
| |
| .text |
| .align 4 |
| .global _start |
| .type _start,%function |
| #if defined(__UCLIBC_CTOR_DTOR__) |
| .type _init,%function |
| .type _fini,%function |
| #else |
| .weak _init |
| .weak _fini |
| #endif |
| .type __uClibc_main,%function |
| /* Stick in a dummy reference to main(), so that if an application |
| * is linking when the main() function is in a static library (.a) |
| * we can be sure that main() actually gets linked in */ |
| .global main |
| .type main,%function |
| |
| #ifdef __PIC__ |
| .LLGETPC0: |
| retl |
| add %o7, %l7, %l7 |
| #endif |
| |
| _start: |
| #ifdef __PIC__ |
| sethi %hi(_GLOBAL_OFFSET_TABLE_-4), %l7 |
| call .LLGETPC0 |
| add %l7, %lo(_GLOBAL_OFFSET_TABLE_+4), %l7 |
| #endif |
| |
| /* Terminate the stack frame, and reserve space for functions to |
| * drop their arguments. */ |
| mov %g0, %fp |
| sub %sp, 6*ELE_SIZE, %sp |
| |
| /* 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+STACK_BIAS+22*ELE_SIZE], %o1 /* %o1 = argc */ |
| add %sp, STACK_BIAS+23*ELE_SIZE, %o2 /* %o2 = argv */ |
| |
| /* Load the addresses of the user entry points. */ |
| sethi %hi(main), %o0 |
| sethi %hi(_init), %o3 |
| sethi %hi(_fini), %o4 |
| or %o0, %lo(main), %o0 |
| or %o3, %lo(_init), %o3 |
| or %o4, %lo(_fini), %o4 |
| #ifdef __PIC__ |
| /* Need a little more magic when building PIC to get addr of main */ |
| LD [%l7 + %o0], %o0 |
| LD [%l7 + %o3], %o3 |
| LD [%l7 + %o4], %o4 |
| #endif |
| |
| /* When starting a binary via the dynamic linker, %g1 contains the |
| * address of the shared library termination function, which will be |
| * registered with atexit(). If we are statically linked, this will |
| * be NULL. */ |
| mov %g1, %o5 |
| |
| /* Let libc do the rest of the initialization, and call main. */ |
| call __uClibc_main |
| nop |
| |
| /* Die very horribly if exit returns. */ |
| #if __WORDSIZE == 32 |
| unimp |
| #else |
| illtrap 0 |
| #endif |
| |
| .size _start,.-_start |
| |
| /* 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 |