diff options
Diffstat (limited to 'libc/sysdeps/linux/sparc64/crt1.S')
| -rw-r--r-- | libc/sysdeps/linux/sparc64/crt1.S | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/sparc64/crt1.S b/libc/sysdeps/linux/sparc64/crt1.S new file mode 100644 index 000000000..55e0dea08 --- /dev/null +++ b/libc/sysdeps/linux/sparc64/crt1.S @@ -0,0 +1,116 @@ +/* Startup code for elf64-sparc + Copyright (C) 1997-2017 Free Software Foundation, Inc. + 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, see + <http://www.gnu.org/licenses/>. */ + +#include <features.h> +#include <sysdep.h> + +.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*8, %sp + + /* Extract the arguments and environment as encoded on the stack. The + argument info starts after one register window (16 words) past the SP, + plus the bias we added, plus the magic v9 STACK_BIAS. */ + ldx [%sp+STACK_BIAS+22*8], %o1 /* %o1 = argc */ + add %sp, STACK_BIAS+23*8, %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. */ + unimp + +.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 |