diff options
Diffstat (limited to 'gcc-4.9/libgcc/config/arc/gmon/mcount.c')
| -rw-r--r-- | gcc-4.9/libgcc/config/arc/gmon/mcount.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/gcc-4.9/libgcc/config/arc/gmon/mcount.c b/gcc-4.9/libgcc/config/arc/gmon/mcount.c new file mode 100644 index 000000000..ebd71e00d --- /dev/null +++ b/gcc-4.9/libgcc/config/arc/gmon/mcount.c @@ -0,0 +1,206 @@ +/*- + * Copyright (c) 1983, 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * Copyright (C) 2007-2014 Free Software Foundation, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if !defined(lint) && !defined(KERNEL) && defined(LIBC_SCCS) +static char sccsid[] = "@(#)mcount.c 8.1 (Berkeley) 6/4/93"; +#endif + +#if 0 +#include <unistd.h> +#include <sys/param.h> +#endif +#include <sys/gmon.h> + +/* This file provides the machine-dependent definitions of the _MCOUNT_DECL + and MCOUNT macros. */ +#include <machine-gmon.h> + +#include <atomic.h> + +/* + * mcount is called on entry to each function compiled with the profiling + * switch set. _mcount(), which is declared in a machine-dependent way + * with _MCOUNT_DECL, does the actual work and is either inlined into a + * C routine or called by an assembly stub. In any case, this magic is + * taken care of by the MCOUNT definition in <machine/profile.h>. + * + * _mcount updates data structures that represent traversals of the + * program's call graph edges. frompc and selfpc are the return + * address and function address that represents the given call graph edge. + * + * Note: the original BSD code used the same variable (frompcindex) for + * both frompcindex and frompc. Any reasonable, modern compiler will + * perform this optimization. + */ +_MCOUNT_DECL(count_ptr, selfpc) /* _mcount; may be static, inline, etc */ +{ + register ARCINDEX *frompcindex; + register struct tostruct *top, *prevtop; + register struct gmonparam *p; + register ARCINDEX toindex; + + /* Check for nested function trampoline. */ + if (selfpc & 2) + selfpc = *(u_long *) (selfpc + 10); + + p = &_gmonparam; + /* + * check that we are profiling + * and that we aren't recursively invoked. + */ +#if 0 + if (catomic_compare_and_exchange_bool_acq (&p->state, GMON_PROF_BUSY, + GMON_PROF_ON)) + return; +#elif defined (__ARC700__) +/* ??? This could temporarily lose the ERROR / OFF condition in a race, + but doing an actual compare_and_exchange would be too costly. It would + be better if we had a semaphore independent of the 'sticky' state, but + then we could run into ABI compatibility problems with the size of struct + gmonparam. */ + { + u_long old_state; + + __asm ("ex %0,%1": "=r" (old_state), "+m" (p->state) + : "0" (GMON_PROF_BUSY)); + if (old_state != GMON_PROF_ON) + { + switch (old_state) + { + case GMON_PROF_OFF: + __asm ("ex %0,%1": "+r" (old_state), "+m" (p->state)); + if (old_state == GMON_PROF_BUSY + /* Switching off while we say we are busy while profiling + was actually already switched off is all right. */ + || old_state == GMON_PROF_OFF) + break; + /* It is not clear if we should allow switching on + profiling at this point, and how to handle further races. + For now, record an error in this case. */ + /* Fall through. */ + default: /* We expect here only GMON_PROF_ERROR. */ + p->state = GMON_PROF_ERROR; + break; + case GMON_PROF_BUSY: break; + } + return; + } + } +#else /* ??? No semaphore primitives available. */ + if (p->state != GMON_PROF_ON) + return; + p->state = GMON_PROF_BUSY; +#endif + + frompcindex = count_ptr; + toindex = *frompcindex; + if (toindex == 0) { + /* + * first time traversing this arc + */ + toindex = ++p->tos[0].link; + if (toindex >= (ARCINDEX) p->tolimit) + /* halt further profiling */ + goto overflow; + + *frompcindex = toindex; + top = &p->tos[toindex]; + top->selfpc = selfpc; + top->count = 1; + top->link = 0; + goto done; + } + top = &p->tos[toindex]; + if (top->selfpc == selfpc) { + /* + * arc at front of chain; usual case. + */ + top->count++; + goto done; + } + /* + * have to go looking down chain for it. + * top points to what we are looking at, + * prevtop points to previous top. + * we know it is not at the head of the chain. + */ + for (; /* goto done */; ) { + if (top->link == 0) { + /* + * top is end of the chain and none of the chain + * had top->selfpc == selfpc. + * so we allocate a new tostruct + * and link it to the head of the chain. + */ + toindex = ++p->tos[0].link; + if (toindex >= (ARCINDEX) p->tolimit) + goto overflow; + + top = &p->tos[toindex]; + top->selfpc = selfpc; + top->count = 1; + top->link = *frompcindex; + *frompcindex = toindex; + goto done; + } + /* + * otherwise, check the next arc on the chain. + */ + prevtop = top; + top = &p->tos[top->link]; + if (top->selfpc == selfpc) { + /* + * there it is. + * increment its count + * move it to the head of the chain. + */ + top->count++; + toindex = prevtop->link; + prevtop->link = top->link; + top->link = *frompcindex; + *frompcindex = toindex; + goto done; + } + + } +done: + p->state = GMON_PROF_ON; + return; +overflow: + p->state = GMON_PROF_ERROR; + return; +} + +/* + * Actual definition of mcount function. Defined in <machine/profile.h>, + * which is included by <sys/gmon.h>. + */ +MCOUNT |