1 /*- 2 * Copyright (c) 1999, 2000 John D. Polstra. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #ifndef RTLD_MACHDEP_H 30 #define RTLD_MACHDEP_H 1 31 32 #include <sys/types.h> 33 #include <machine/atomic.h> 34 35 struct Struct_Obj_Entry; 36 37 /* Return the address of the .dynamic section in the dynamic linker. */ 38 #define rtld_dynamic(obj) \ 39 ((const Elf_Dyn *)((obj)->relocbase + (Elf_Addr)&_DYNAMIC)) 40 41 /* Fixup the jump slot at "where" to transfer control to "target". */ 42 static inline Elf_Addr 43 reloc_jmpslot(Elf_Addr *where, Elf_Addr target, 44 const struct Struct_Obj_Entry *obj, 45 const struct Struct_Obj_Entry *refobj, const Elf_Rel *rel) 46 { 47 #ifdef dbg 48 dbg("reloc_jmpslot: *%p = %p", (void *)(where), 49 (void *)(target)); 50 #endif 51 (*(Elf_Addr *)(where) = (Elf_Addr)(target)); 52 return target; 53 } 54 55 #define make_function_pointer(def, defobj) \ 56 ((defobj)->relocbase + (def)->st_value) 57 58 #define call_initfini_pointer(obj, target) \ 59 (((InitFunc)(target))()) 60 61 #define round(size, align) \ 62 (((size) + (align) - 1) & ~((align) - 1)) 63 #define calculate_first_tls_offset(size, align) \ 64 round(size, align) 65 #define calculate_tls_offset(prev_offset, prev_size, size, align) \ 66 round((prev_offset) + (size), align) 67 #define calculate_tls_end(off, size) (off) 68 69 typedef struct { 70 unsigned long ti_module; 71 unsigned long ti_offset; 72 } tls_index; 73 74 extern void *__tls_get_addr(tls_index *ti); 75 76 #define RTLD_DEFAULT_STACK_PF_EXEC PF_X 77 #define RTLD_DEFAULT_STACK_EXEC PROT_EXEC 78 79 #endif 80