1 /* 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)profile.h 8.1 (Berkeley) 06/11/93 8 */ 9 10 #define _MCOUNT_DECL static inline void _mcount 11 12 #define MCOUNT \ 13 extern void mcount() asm("mcount"); void mcount() { \ 14 int selfpc, frompcindex; \ 15 /* \ 16 * find the return address for mcount, \ 17 * and the return address for mcount's caller. \ 18 * \ 19 * selfpc = pc pushed by mcount call \ 20 */ \ 21 asm("movl 4(%%ebp),%0" : "=r" (selfpc)); \ 22 /* \ 23 * frompcindex = pc pushed by jsr into self. \ 24 * In GCC the caller's stack frame has already been built so we \ 25 * have to chase a6 to find caller's raddr. \ 26 */ \ 27 asm("movl (%%ebp),%0" : "=r" (frompcindex)); \ 28 frompcindex = ((int *)frompcindex)[1]; \ 29 _mcount(frompcindex, selfpc); \ 30 } 31