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 struct 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". */ 39 static inline Elf_Addr 40 reloc_jmpslot(Elf_Addr *where, Elf_Addr target, 41 const struct Struct_Obj_Entry *obj) 42 { 43 dbg("reloc_jmpslot: *%p = %p", (void *)(where), 44 (void *)(target)); 45 (*(Elf_Addr *)(where) = (Elf_Addr)(target)); 46 return target; 47 } 48 49 #define make_function_pointer(def, defobj) \ 50 ((defobj)->relocbase + (def)->st_value) 51 52 #define call_initfini_pointer(obj, target) \ 53 (((InitFunc)(target))()) 54 55 static inline void 56 atomic_decr_int(volatile int *p) 57 { 58 __asm __volatile ("lock; decl %0" : "+m"(*p) : : "cc"); 59 } 60 61 static inline void 62 atomic_incr_int(volatile int *p) 63 { 64 __asm __volatile ("lock; incl %0" : "+m"(*p) : : "cc"); 65 } 66 67 static inline void 68 atomic_add_int(volatile int *p, int val) 69 { 70 __asm __volatile ("lock; addl %1, %0" 71 : "+m"(*p) 72 : "ri"(val) 73 : "cc"); 74 } 75 76 #endif 77