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Diffstat (limited to 'sysdeps/hppa/elf/initfini.c')
| -rw-r--r-- | sysdeps/hppa/elf/initfini.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/sysdeps/hppa/elf/initfini.c b/sysdeps/hppa/elf/initfini.c new file mode 100644 index 0000000000..35f5dd52fe --- /dev/null +++ b/sysdeps/hppa/elf/initfini.c @@ -0,0 +1,139 @@ +/* Special .init and .fini section support for HPPA + Copyright (C) 2000, 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. */ + +/* This file is compiled into assembly code which is then munged by a sed + script into two files: crti.s and crtn.s. + + * 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. + + * crtn.s puts the corresponding function epilogues + in the .init and .fini sections. */ + +/* If we use the standard C version, the linkage table pointer won't + be properly preserved due to the splitting up of function prologues + and epilogues. Therefore we write these in assembly to make sure + they do the right thing. + + Note that we cannot have a weak undefined __gmon_start__, because + that would require this to be PIC, and the linker is currently not + able to generate a proper procedure descriptor for _init. Sad but + true. Anyway, HPPA is one of those horrible architectures where + making the comparison and indirect call is quite expensive (see the + comment in sysdeps/generic/initfini.c). */ + +__asm__ ("\ +\n\ +#include \"defs.h\"\n\ +\n\ +/*@HEADER_ENDS*/\n\ +\n\ +/*@_init_PROLOG_BEGINS*/\n\ + .section .init\n\ + .align 4\n\ + .globl _init\n\ + .type _init,@function\n\ +_init:\n\ + stw %rp,-20(%sp)\n\ + stwm %r4,64(%sp)\n\ + stw %r19,-32(%sp)\n\ + bl __gmon_start__,%rp\n\ + copy %r19,%r4 /* delay slot */\n\ + copy %r4,%r19\n\ +/*@_init_PROLOG_ENDS*/\n\ +\n\ +/*@_init_EPILOG_BEGINS*/\n\ + .text\n\ + .align 4\n\ + .weak __gmon_start__\n\ + .type __gmon_start__,@function\n\ +__gmon_start__:\n\ + .proc\n\ + .callinfo\n\ + .entry\n\ + bv,n %r0(%r2)\n\ + .exit\n\ + .procend\n\ +\n\ +/* Here is the tail end of _init. We put __gmon_start before this so\n\ + that the assembler creates the .PARISC.unwind section for us, ie.\n\ + with the right attributes. */\n\ + .section .init\n\ + ldw -84(%sp),%rp\n\ + copy %r4,%r19\n\ + bv %r0(%rp)\n\ +_end_init:\n\ + ldwm -64(%sp),%r4\n\ +\n\ +/* Our very own unwind info, because the assembler can't handle\n\ + functions split into two or more pieces. */\n\ + .section .PARISC.unwind\n\ + .extern _init\n\ + .word _init, _end_init\n\ + .byte 0x08, 0x01, 0x00, 0x08, 0x00, 0x00, 0x00, 0x08\n\ +\n\ +/*@_init_EPILOG_ENDS*/\n\ +\n\ +/*@_fini_PROLOG_BEGINS*/\n\ + .section .fini\n\ + .align 4\n\ + .globl _fini\n\ + .type _fini,@function\n\ +_fini:\n\ + stw %rp,-20(%sp)\n\ + stwm %r4,64(%sp)\n\ + stw %r19,-32(%sp)\n\ + copy %r19,%r4\n\ +/*@_fini_PROLOG_ENDS*/\n\ +\n\ +/*@_fini_EPILOG_BEGINS*/\n\ + .section .fini\n\ + ldw -84(%sp),%rp\n\ + copy %r4,%r19\n\ + bv %r0(%rp)\n\ +_end_fini:\n\ + ldwm -64(%sp),%r4\n\ +\n\ + .section .PARISC.unwind\n\ + .extern _fini\n\ + .word _fini, _end_fini\n\ + .byte 0x08, 0x01, 0x00, 0x08, 0x00, 0x00, 0x00, 0x08\n\ +\n\ +/*@_fini_EPILOG_ENDS*/\n\ +\n\ +/*@TRAILER_BEGINS*/\ +"); |