102 lines
5.2 KiB
C
102 lines
5.2 KiB
C
/* Definitions of target machine for GNU compiler, for HPs running
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HP-UX using the 64bit runtime model.
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Copyright (C) 1999-2020 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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/* We use DTOR_LIST_BEGIN to carry a bunch of hacks to allow us to use
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the init and fini array sections with both the HP and GNU linkers.
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The linkers setup the required dynamic entries in the dynamic segment
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and the dynamic linker does the calls. This approach avoids using
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collect2.
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The first hack is to implement __do_global_ctors_aux in crtbegin as
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it needs to be the first entry in the init array so that it is called
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last. HP got the order of the init array backwards. The DT_INIT_ARRAY
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is supposed to be executed in the same order as the addresses appear in
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the array. DT_FINI_ARRAY is supposed to be executed in the opposite
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order.
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The second hack is a set of plabels to implement the effect of
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CRT_CALL_STATIC_FUNCTION. HP-UX 11 only supports DI_INIT_ARRAY and
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DT_FINI_ARRAY and they put the arrays in .init and .fini, rather than
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in .init_array and .fini_array. The standard defines for .init and
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.fini have the execute flag set. So, the assembler has to be hacked
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to munge the standard flags for these sections to make them agree
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with what the HP linker expects. With the GNU linker, we need to
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used the .init_array and .fini_array sections. So, we set up for
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both just in case. Once we have built the table, the linker does
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the rest of the work.
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The order is significant. Placing __do_global_ctors_aux first in
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the list, results in it being called last. User specified initializers,
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either using the linker +init command or a plabel, run before the
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initializers specified here. */
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/* We need to add frame_dummy to the initializer list if EH_FRAME_SECTION_NAME
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is defined. */
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#if defined(__LIBGCC_EH_FRAME_SECTION_NAME__)
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#define PA_INIT_FRAME_DUMMY_ASM_OP ".dword P%frame_dummy"
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#else
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#define PA_INIT_FRAME_DUMMY_ASM_OP ""
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#endif
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/* The following hack sets up the .init, .init_array, .fini and
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.fini_array sections. */
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#define PA_CRTBEGIN_HACK \
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asm (TEXT_SECTION_ASM_OP); \
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static void __attribute__((used)) \
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__do_global_ctors_aux (void) \
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{ \
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func_ptr *p = __CTOR_LIST__; \
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while (*(p + 1)) \
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p++; \
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for (; *p != (func_ptr) -1; p--) \
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(*p) (); \
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} \
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\
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asm (HP_INIT_ARRAY_SECTION_ASM_OP); \
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asm (".align 8"); \
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asm (".dword P%__do_global_ctors_aux"); \
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asm (PA_INIT_FRAME_DUMMY_ASM_OP); \
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asm (GNU_INIT_ARRAY_SECTION_ASM_OP); \
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asm (".align 8"); \
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asm (".dword P%__do_global_ctors_aux"); \
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asm (PA_INIT_FRAME_DUMMY_ASM_OP); \
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asm (HP_FINI_ARRAY_SECTION_ASM_OP); \
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asm (".align 8"); \
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asm (".dword P%__do_global_dtors_aux"); \
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asm (GNU_FINI_ARRAY_SECTION_ASM_OP); \
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asm (".align 8"); \
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asm (".dword P%__do_global_dtors_aux")
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/* The following two variants of DTOR_LIST_BEGIN are identical to those
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in crtstuff.c except for the addition of the above crtbegin hack. */
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#ifdef __LIBGCC_DTORS_SECTION_ASM_OP__
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#define DTOR_LIST_BEGIN \
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asm (DTORS_SECTION_ASM_OP); \
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STATIC func_ptr __DTOR_LIST__[1] \
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__attribute__ ((aligned(sizeof(func_ptr)))) \
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= { (func_ptr) (-1) }; \
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PA_CRTBEGIN_HACK
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#else
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#define DTOR_LIST_BEGIN \
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STATIC func_ptr __DTOR_LIST__[1] \
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__attribute__ ((section(".dtors"), aligned(sizeof(func_ptr)))) \
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= { (func_ptr) (-1) }; \
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PA_CRTBEGIN_HACK
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#endif
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