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0191bd2bd6
27-nvalgrind Make valgrind.h pay attention to the preprocessor symbol NVALGRIND. If defined, it compiles out the Valgrind magic sequence and just assigns the result with the default return. This is analogous to NDEBUG's effect on assert(). git-svn-id: svn://svn.valgrind.org/valgrind/trunk@1320
171 lines
7.8 KiB
C
171 lines
7.8 KiB
C
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/*
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----------------------------------------------------------------
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Notice that the following BSD-style license applies to this one
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file (valgrind.h) only. The entire rest of Valgrind is licensed
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under the terms of the GNU General Public License, version 2. See
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the COPYING file in the source distribution for details.
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----------------------------------------------------------------
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This file is part of Valgrind, an extensible x86 protected-mode
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emulator for monitoring program execution on x86-Unixes.
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Copyright (C) 2000-2002 Julian Seward. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. The origin of this software must not be misrepresented; you must
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not claim that you wrote the original software. If you use this
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software in a product, an acknowledgment in the product
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documentation would be appreciated but is not required.
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3. Altered source versions must be plainly marked as such, and must
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not be misrepresented as being the original software.
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4. The name of the author may not be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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----------------------------------------------------------------
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Notice that the above BSD-style license applies to this one file
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(valgrind.h) only. The entire rest of Valgrind is licensed under
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the terms of the GNU General Public License, version 2. See the
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COPYING file in the source distribution for details.
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----------------------------------------------------------------
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*/
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#ifndef __VALGRIND_H
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#define __VALGRIND_H
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/* This file is for inclusion into client (your!) code.
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You can use these macros to manipulate and query Valgrind's
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execution inside your own programs.
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The resulting executables will still run without Valgrind, just a
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little bit more slowly than they otherwise would, but otherwise
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unchanged.
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When run on Valgrind with --client-perms=yes, Valgrind observes
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these macro calls and takes appropriate action. When run on
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Valgrind with --client-perms=no (the default), Valgrind observes
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these macro calls but does not take any action as a result. */
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#ifndef NVALGRIND
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/* This defines the magic code sequence which the JITter spots and
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handles magically. Don't look too closely at this; it will rot
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your brain. Valgrind dumps the result value in %EDX, so we first
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copy the default value there, so that it is returned when not
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running on Valgrind. Since %EAX points to a block of mem
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containing the args, you can pass as many args as you want like
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this. Currently this is set up to deal with 4 args since that's
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the max that we appear to need (pthread_create).
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*/
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#define VALGRIND_MAGIC_SEQUENCE( \
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_zzq_rlval, /* result lvalue */ \
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_zzq_default, /* result returned when running on real CPU */ \
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_zzq_request, /* request code */ \
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_zzq_arg1, /* request first param */ \
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_zzq_arg2, /* request second param */ \
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_zzq_arg3, /* request third param */ \
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_zzq_arg4 /* request fourth param */ ) \
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\
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{ volatile unsigned int _zzq_args[5]; \
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_zzq_args[0] = (volatile unsigned int)(_zzq_request); \
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_zzq_args[1] = (volatile unsigned int)(_zzq_arg1); \
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_zzq_args[2] = (volatile unsigned int)(_zzq_arg2); \
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_zzq_args[3] = (volatile unsigned int)(_zzq_arg3); \
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_zzq_args[4] = (volatile unsigned int)(_zzq_arg4); \
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asm volatile("movl %1, %%eax\n\t" \
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"movl %2, %%edx\n\t" \
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"roll $29, %%eax ; roll $3, %%eax\n\t" \
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"rorl $27, %%eax ; rorl $5, %%eax\n\t" \
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"roll $13, %%eax ; roll $19, %%eax\n\t" \
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"movl %%edx, %0\t" \
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: "=r" (_zzq_rlval) \
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: "r" (&_zzq_args[0]), "r" (_zzq_default) \
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: "eax", "edx", "cc", "memory" \
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); \
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}
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#else /* NVALGRIND */
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/* Define NVALGRIND to completely remove the Valgrind magic sequence
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from the compiled code (analogous to NDEBUG's effects on
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assert()) */
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#define VALGRIND_MAGIC_SEQUENCE( \
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_zzq_rlval, /* result lvalue */ \
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_zzq_default, /* result returned when running on real CPU */ \
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_zzq_request, /* request code */ \
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_zzq_arg1, /* request first param */ \
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_zzq_arg2, /* request second param */ \
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_zzq_arg3, /* request third param */ \
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_zzq_arg4 /* request fourth param */ ) \
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{ \
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(_zzq_rlval) = (_zzq_default); \
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}
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#endif /* NVALGRIND */
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/* Some request codes. There are many more of these, but most are not
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exposed to end-user view. These are the public ones, all of the
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form 0x1000 + small_number.
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*/
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#define VG_USERREQ_SKIN_BASE(a,b) ((unsigned int)(((a)&0xff) << 24 | ((b)&0xff) << 16))
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#define VG_IS_SKIN_USERREQ(a, b, v) (VG_USERREQ_SKIN_BASE(a,b) == ((v) & 0xffff0000))
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typedef
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enum { VG_USERREQ__RUNNING_ON_VALGRIND = 0x1001,
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VG_USERREQ__DISCARD_TRANSLATIONS,
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VG_USERREQ__FINAL_DUMMY_CLIENT_REQUEST,
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} Vg_ClientRequest;
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/* Returns 1 if running on Valgrind, 0 if running on the real CPU.
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Currently implemented but untested. */
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#define RUNNING_ON_VALGRIND \
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({unsigned int _qzz_res; \
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VALGRIND_MAGIC_SEQUENCE(_qzz_res, 0 /* returned if not */, \
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VG_USERREQ__RUNNING_ON_VALGRIND, \
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0, 0, 0, 0); \
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_qzz_res; \
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})
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/* Discard translation of code in the range [_qzz_addr .. _qzz_addr +
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_qzz_len - 1]. Useful if you are debugging a JITter or some such,
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since it provides a way to make sure valgrind will retranslate the
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invalidated area. Returns no value. */
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#define VALGRIND_DISCARD_TRANSLATIONS(_qzz_addr,_qzz_len) \
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{unsigned int _qzz_res; \
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VALGRIND_MAGIC_SEQUENCE(_qzz_res, 0, \
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VG_USERREQ__DISCARD_TRANSLATIONS, \
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_qzz_addr, _qzz_len, 0, 0); \
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}
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#endif
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