1 /*- 2 * Copyright (c) 1999, 2000 John D. Polstra. 3 * Copyright (c) 2014 the FreeBSD Foundation 4 * All rights reserved. 5 * 6 * Portions of this software were developed by Andrew Turner 7 * under sponsorship from the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #ifndef RTLD_MACHDEP_H 32 #define RTLD_MACHDEP_H 1 33 34 #include <sys/types.h> 35 #include <machine/atomic.h> 36 #include <machine/ifunc.h> 37 #include <machine/tls.h> 38 39 struct Struct_Obj_Entry; 40 41 #define MD_OBJ_ENTRY \ 42 bool variant_pcs : 1; /* Object has a variant pcs function */ 43 44 #define MD_OBJ_ENTRY_INIT(obj) 45 #define MD_OBJ_ENTRY_FINI(obj) 46 47 /* Return the address of the .dynamic section in the dynamic linker. */ 48 #define rtld_dynamic(obj) \ 49 ({ \ 50 Elf_Addr _dynamic_addr; \ 51 asm volatile("adr %0, _DYNAMIC" : "=&r"(_dynamic_addr)); \ 52 (const Elf_Dyn *)_dynamic_addr; \ 53 }) 54 55 bool arch_digest_dynamic(struct Struct_Obj_Entry *obj, const Elf_Dyn *dynp); 56 57 bool arch_digest_note(struct Struct_Obj_Entry *obj, const Elf_Note *note); 58 59 #define arch_fix_auxv(a, ai) do {} while (0) 60 61 Elf_Addr reloc_jmpslot(Elf_Addr *where, Elf_Addr target, 62 const struct Struct_Obj_Entry *defobj, const struct Struct_Obj_Entry *obj, 63 const Elf_Rel *rel); 64 65 #define make_function_pointer(def, defobj) \ 66 ((defobj)->relocbase + (def)->st_value) 67 68 #define call_initfini_pointer(obj, target) \ 69 (((InitFunc)(target))()) 70 71 #define call_init_pointer(obj, target) \ 72 (((InitArrFunc)(target))(main_argc, main_argv, environ)) 73 74 extern struct __ifunc_arg_t ifunc_arg; 75 76 /* 77 * Pass zeros into the ifunc resolver so we can change them later. The first 78 * 8 arguments on arm64 are passed in registers so make them known values 79 * if we decide to use them later. Because of this ifunc resolvers can assume 80 * no arguments are passed in, and if this changes later will be able to 81 * compare the argument with 0 to see if it is set. 82 */ 83 #define call_ifunc_resolver(ptr) \ 84 (((Elf_Addr (*)(uint64_t, const struct __ifunc_arg_t *, uint64_t, \ 85 uint64_t, uint64_t, uint64_t, uint64_t, uint64_t))ptr)( \ 86 ifunc_arg._hwcap, &ifunc_arg, 0, 0, 0, 0, 0, 0)) 87 88 #define round(size, align) \ 89 (((size) + (align) - 1) & ~((align) - 1)) 90 #define calculate_first_tls_offset(size, align, offset) \ 91 round(16, align) 92 #define calculate_tls_offset(prev_offset, prev_size, size, align, offset) \ 93 round(prev_offset + prev_size, align) 94 #define calculate_tls_post_size(align) \ 95 round(TLS_TCB_SIZE, align) - TLS_TCB_SIZE 96 97 typedef struct { 98 unsigned long ti_module; 99 unsigned long ti_offset; 100 } tls_index; 101 102 extern void *__tls_get_addr(tls_index *ti); 103 104 #define md_abi_variant_hook(x) 105 106 #endif 107