rtld_machdep.h revision 107071
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: head/libexec/rtld-elf/amd64/rtld_machdep.h 107071 2002-11-18 22:08:50Z tmm $ 27 */ 28 29#ifndef RTLD_MACHDEP_H 30#define RTLD_MACHDEP_H 1 31 32struct Struct_Obj_Entry; 33 34/* Return the address of the .dynamic section in the dynamic linker. */ 35#define rtld_dynamic(obj) \ 36 ((const Elf_Dyn *)((obj)->relocbase + (Elf_Addr)&_DYNAMIC)) 37 38/* Fixup the jump slot at "where" to transfer control to "target". */ 39static inline Elf_Addr 40reloc_jmpslot(Elf_Addr *where, Elf_Addr target, 41 const struct Struct_Obj_Entry *obj, 42 const struct Struct_Obj_Entry *refobj, const Elf_Rel *rel) 43{ 44 dbg("reloc_jmpslot: *%p = %p", (void *)(where), 45 (void *)(target)); 46 (*(Elf_Addr *)(where) = (Elf_Addr)(target)); 47 return target; 48} 49 50#define make_function_pointer(def, defobj) \ 51 ((defobj)->relocbase + (def)->st_value) 52 53#define call_initfini_pointer(obj, target) \ 54 (((InitFunc)(target))()) 55 56static inline void 57atomic_decr_int(volatile int *p) 58{ 59 __asm __volatile ("lock; decl %0" : "+m"(*p) : : "cc"); 60} 61 62static inline void 63atomic_incr_int(volatile int *p) 64{ 65 __asm __volatile ("lock; incl %0" : "+m"(*p) : : "cc"); 66} 67 68static inline void 69atomic_add_int(volatile int *p, int val) 70{ 71 __asm __volatile ("lock; addl %1, %0" 72 : "+m"(*p) 73 : "ri"(val) 74 : "cc"); 75} 76 77#endif 78