1 /* Definitions of target machine for GNU compiler, for HPs running 2 HP-UX using the 64bit runtime model. 3 Copyright (C) 1999-2022 Free Software Foundation, Inc. 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3, or (at your option) 10 any later version. 11 12 GCC is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 Under Section 7 of GPL version 3, you are granted additional 18 permissions described in the GCC Runtime Library Exception, version 19 3.1, as published by the Free Software Foundation. 20 21 You should have received a copy of the GNU General Public License and 22 a copy of the GCC Runtime Library Exception along with this program; 23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 <http://www.gnu.org/licenses/>. */ 25 26 /* We use DTOR_LIST_BEGIN to carry a bunch of hacks to allow us to use 27 the init and fini array sections with both the HP and GNU linkers. 28 The linkers setup the required dynamic entries in the dynamic segment 29 and the dynamic linker does the calls. This approach avoids using 30 collect2. 31 32 The first hack is to implement __do_global_ctors_aux in crtbegin as 33 it needs to be the first entry in the init array so that it is called 34 last. HP got the order of the init array backwards. The DT_INIT_ARRAY 35 is supposed to be executed in the same order as the addresses appear in 36 the array. DT_FINI_ARRAY is supposed to be executed in the opposite 37 order. 38 39 The second hack is a set of plabels to implement the effect of 40 CRT_CALL_STATIC_FUNCTION. HP-UX 11 only supports DI_INIT_ARRAY and 41 DT_FINI_ARRAY and they put the arrays in .init and .fini, rather than 42 in .init_array and .fini_array. The standard defines for .init and 43 .fini have the execute flag set. So, the assembler has to be hacked 44 to munge the standard flags for these sections to make them agree 45 with what the HP linker expects. With the GNU linker, we need to 46 used the .init_array and .fini_array sections. So, we set up for 47 both just in case. Once we have built the table, the linker does 48 the rest of the work. 49 The order is significant. Placing __do_global_ctors_aux first in 50 the list, results in it being called last. User specified initializers, 51 either using the linker +init command or a plabel, run before the 52 initializers specified here. */ 53 54 /* We need to add frame_dummy to the initializer list if EH_FRAME_SECTION_NAME 55 is defined. */ 56 #if defined(__LIBGCC_EH_FRAME_SECTION_NAME__) 57 #define PA_INIT_FRAME_DUMMY_ASM_OP ".dword P%frame_dummy" 58 #else 59 #define PA_INIT_FRAME_DUMMY_ASM_OP "" 60 #endif 61 62 /* The following hack sets up the .init, .init_array, .fini and 63 .fini_array sections. */ 64 #define PA_CRTBEGIN_HACK \ 65 asm (TEXT_SECTION_ASM_OP); \ 66 static void __attribute__((used)) \ 67 __do_global_ctors_aux (void) \ 68 { \ 69 func_ptr *p = __CTOR_LIST__; \ 70 while (*(p + 1)) \ 71 p++; \ 72 for (; *p != (func_ptr) -1; p--) \ 73 (*p) (); \ 74 } \ 75 \ 76 asm (HP_INIT_ARRAY_SECTION_ASM_OP); \ 77 asm (".align 8"); \ 78 asm (".dword P%__do_global_ctors_aux"); \ 79 asm (PA_INIT_FRAME_DUMMY_ASM_OP); \ 80 asm (GNU_INIT_ARRAY_SECTION_ASM_OP); \ 81 asm (".align 8"); \ 82 asm (".dword P%__do_global_ctors_aux"); \ 83 asm (PA_INIT_FRAME_DUMMY_ASM_OP); \ 84 asm (HP_FINI_ARRAY_SECTION_ASM_OP); \ 85 asm (".align 8"); \ 86 asm (".dword P%__do_global_dtors_aux"); \ 87 asm (GNU_FINI_ARRAY_SECTION_ASM_OP); \ 88 asm (".align 8"); \ 89 asm (".dword P%__do_global_dtors_aux") 90 91 /* The following two variants of DTOR_LIST_BEGIN are identical to those 92 in crtstuff.c except for the addition of the above crtbegin hack. */ 93 #ifdef __LIBGCC_DTORS_SECTION_ASM_OP__ 94 #define DTOR_LIST_BEGIN \ 95 asm (DTORS_SECTION_ASM_OP); \ 96 STATIC func_ptr __DTOR_LIST__[1] \ 97 __attribute__ ((aligned(sizeof(func_ptr)))) \ 98 = { (func_ptr) (-1) }; \ 99 PA_CRTBEGIN_HACK 100 #else 101 #define DTOR_LIST_BEGIN \ 102 STATIC func_ptr __DTOR_LIST__[1] \ 103 __attribute__ ((section(".dtors"), aligned(sizeof(func_ptr)))) \ 104 = { (func_ptr) (-1) }; \ 105 PA_CRTBEGIN_HACK 106 #endif 107