diff options
Diffstat (limited to 'sysdeps/ia64/crti.S')
| -rw-r--r-- | sysdeps/ia64/crti.S | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/sysdeps/ia64/crti.S b/sysdeps/ia64/crti.S new file mode 100644 index 0000000000..0615ddecf7 --- /dev/null +++ b/sysdeps/ia64/crti.S @@ -0,0 +1,160 @@ +/* Special .init and .fini section support for IA64. + Copyright (C) 2000-2014 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, see + <http://www.gnu.org/licenses/>. */ + +/* crti.S puts a function prologue at the beginning of the .init and + .fini sections and defines global symbols for those addresses, so + they can be called as functions. The symbols _init and _fini are + magic and cause the linker to emit DT_INIT and DT_FINI. */ + +#include <libc-symbols.h> +#include <sysdep.h> +#undef ret + +#ifndef PREINIT_FUNCTION +# define PREINIT_FUNCTION __gmon_start__ +#endif + +#ifndef PREINIT_FUNCTION_WEAK +# define PREINIT_FUNCTION_WEAK 1 +#endif + +#if PREINIT_FUNCTION_WEAK + weak_extern (PREINIT_FUNCTION) +#else + .hidden PREINIT_FUNCTION +#endif + +/* If we have working .init_array support, we want to keep the .init + section empty (apart from the mandatory prologue/epilogue. This + ensures that the default unwind conventions (return-pointer in b0, + frame state in ar.pfs, etc.) will do the Right Thing. To ensure + an empty .init section, we register gmon_initializer() via the + .init_array. + + --davidm 02/10/29 */ + +#if PREINIT_FUNCTION_WEAK +/* This blob of assembly code is one simple C function: + +static void +__attribute__ ((used)) +gmon_initializer (void) +{ + extern void weak_function __gmon_start__ (void); + + if (__gmon_start__) + (*__gmon_start__)(); +} + */ + .text + .align 64 + .proc gmon_initializer# +gmon_initializer: + .prologue 12, 32 + .mmi + .save ar.pfs, r33 + alloc r33 = ar.pfs, 0, 3, 0, 0 + addl r14 = @ltoff(@fptr(PREINIT_FUNCTION#)), gp + .save rp, r32 + mov r32 = b0 + .mmi + mov r34 = r1 + .body + ;; + ld8 r14 = [r14] + nop 0 + ;; + .mib + cmp.eq p6, p7 = 0, r14 + nop 0 + (p6) br.cond.spnt .L1 + ;; + .mib + nop 0 + nop 0 + br.call.sptk.many b0 = PREINIT_FUNCTION# + ;; + .mmi + mov r1 = r34 + nop 0 + nop 0 +.L1: + .mii + nop 0 + mov ar.pfs = r33 + nop 0 + ;; + .mib + nop 0 + mov b0 = r32 + br.ret.sptk.many b0 + .endp gmon_initializer# +# undef PREINIT_FUNCTION +# define PREINIT_FUNCTION gmon_initializer +#endif + .section .init_array, "aw" + data8 @fptr(PREINIT_FUNCTION) + + .section .init,"ax",@progbits + .global _init# + .proc _init# +_init: + .prologue + .save ar.pfs, r34 + alloc r34 = ar.pfs, 0, 3, 0, 0 + .vframe r32 + mov r32 = r12 + .save rp, r33 + mov r33 = b0 + .body + adds r12 = -16, r12 + ;; /* see gmon_initializer() above */ + .endp _init# + + .section .fini,"ax",@progbits + .global _fini# + .proc _fini# +_fini: + .prologue + .save ar.pfs, r34 + alloc r34 = ar.pfs, 0, 3, 0, 0 + .vframe r32 + mov r32 = r12 + .save rp, r33 + mov r33 = b0 + .body + adds r12 = -16, r12 + ;; + .endp _fini# |