1 /*- 2 * Copyright (c) 1999, 2000 John D. Polstra. 3 * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com> 4 * All rights reserved. 5 * 6 * Portions of this software were developed by SRI International and the 7 * University of Cambridge Computer Laboratory under DARPA/AFRL contract 8 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme. 9 * 10 * Portions of this software were developed by the University of Cambridge 11 * Computer Laboratory as part of the CTSRD Project, with support from the 12 * UK Higher Education Innovation Fund (HEIF). 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * $FreeBSD$ 36 */ 37 38 #ifndef RTLD_MACHDEP_H 39 #define RTLD_MACHDEP_H 1 40 41 #include <sys/types.h> 42 #include <machine/atomic.h> 43 44 struct Struct_Obj_Entry; 45 46 uint64_t set_gp(struct Struct_Obj_Entry *obj); 47 48 /* Return the address of the .dynamic section in the dynamic linker. */ 49 #define rtld_dynamic(obj) \ 50 ({ \ 51 Elf_Addr _dynamic_addr; \ 52 __asm __volatile("lla %0, _DYNAMIC" : "=r"(_dynamic_addr)); \ 53 (const Elf_Dyn *)_dynamic_addr; \ 54 }) 55 #define RTLD_IS_DYNAMIC() (1) 56 57 Elf_Addr reloc_jmpslot(Elf_Addr *where, Elf_Addr target, 58 const struct Struct_Obj_Entry *defobj, 59 const struct Struct_Obj_Entry *obj, 60 const Elf_Rel *rel); 61 62 #define make_function_pointer(def, defobj) \ 63 ((defobj)->relocbase + (def)->st_value) 64 65 #define call_initfini_pointer(obj, target) \ 66 ({ \ 67 uint64_t old0; \ 68 old0 = set_gp(obj); \ 69 (((InitFunc)(target))()); \ 70 __asm __volatile("mv gp, %0" :: "r"(old0)); \ 71 }) 72 73 #define call_init_pointer(obj, target) \ 74 ({ \ 75 uint64_t old1; \ 76 old1 = set_gp(obj); \ 77 (((InitArrFunc)(target))(main_argc, main_argv, environ)); \ 78 __asm __volatile("mv gp, %0" :: "r"(old1)); \ 79 }) 80 81 /* 82 * Lazy binding entry point, called via PLT. 83 */ 84 void _rtld_bind_start(void); 85 86 /* 87 * TLS 88 */ 89 #define TLS_TP_OFFSET 0x0 90 #define TLS_DTV_OFFSET 0x800 91 #define TLS_TCB_SIZE 16 92 93 #define round(size, align) \ 94 (((size) + (align) - 1) & ~((align) - 1)) 95 #define calculate_first_tls_offset(size, align) \ 96 round(16, align) 97 #define calculate_tls_offset(prev_offset, prev_size, size, align) \ 98 round(prev_offset + prev_size, align) 99 #define calculate_tls_end(off, size) ((off) + (size)) 100 101 typedef struct { 102 unsigned long ti_module; 103 unsigned long ti_offset; 104 } tls_index; 105 106 extern void *__tls_get_addr(tls_index* ti); 107 108 #define RTLD_DEFAULT_STACK_PF_EXEC PF_X 109 #define RTLD_DEFAULT_STACK_EXEC PROT_EXEC 110 111 #define md_abi_variant_hook(x) 112 113 #endif 114