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 * $FreeBSD$ 31 */ 32 33 #ifndef RTLD_MACHDEP_H 34 #define RTLD_MACHDEP_H 1 35 36 #include <sys/types.h> 37 #include <machine/atomic.h> 38 #include <machine/tls.h> 39 40 struct Struct_Obj_Entry; 41 42 /* Return the address of the .dynamic section in the dynamic linker. */ 43 #define rtld_dynamic(obj) \ 44 ({ \ 45 Elf_Addr _dynamic_addr; \ 46 asm volatile("adr %0, _DYNAMIC" : "=&r"(_dynamic_addr)); \ 47 (const Elf_Dyn *)_dynamic_addr; \ 48 }) 49 50 Elf_Addr reloc_jmpslot(Elf_Addr *where, Elf_Addr target, 51 const struct Struct_Obj_Entry *defobj, const struct Struct_Obj_Entry *obj, 52 const Elf_Rel *rel); 53 54 #define make_function_pointer(def, defobj) \ 55 ((defobj)->relocbase + (def)->st_value) 56 57 #define call_initfini_pointer(obj, target) \ 58 (((InitFunc)(target))()) 59 60 #define call_init_pointer(obj, target) \ 61 (((InitArrFunc)(target))(main_argc, main_argv, environ)) 62 63 /* 64 * Pass zeros into the ifunc resolver so we can change them later. The first 65 * 8 arguments on arm64 are passed in registers so make them known values 66 * if we decide to use them later. Because of this ifunc resolvers can assume 67 * no arguments are passeed in, and if this changes later will be able to 68 * compare the argument with 0 to see if it is set. 69 */ 70 #define call_ifunc_resolver(ptr) \ 71 (((Elf_Addr (*)(uint64_t, uint64_t, uint64_t, uint64_t, uint64_t, \ 72 uint64_t, uint64_t, uint64_t))ptr)(0, 0, 0, 0, 0, 0, 0, 0)) 73 74 #define round(size, align) \ 75 (((size) + (align) - 1) & ~((align) - 1)) 76 #define calculate_first_tls_offset(size, align, offset) \ 77 round(16, align) 78 #define calculate_tls_offset(prev_offset, prev_size, size, align, offset) \ 79 round(prev_offset + prev_size, align) 80 #define calculate_tls_post_size(align) \ 81 round(TLS_TCB_SIZE, align) - TLS_TCB_SIZE 82 83 typedef struct { 84 unsigned long ti_module; 85 unsigned long ti_offset; 86 } tls_index; 87 88 extern void *__tls_get_addr(tls_index *ti); 89 90 #define md_abi_variant_hook(x) 91 92 #endif 93