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1 
2 /*---------------------------------------------------------------*/
3 /*--- begin                                   libvex_emwarn.h ---*/
4 /*---------------------------------------------------------------*/
5 
6 /*
7    This file is part of Valgrind, a dynamic binary instrumentation
8    framework.
9 
10    Copyright (C) 2004-2012 OpenWorks LLP
11       info@open-works.net
12 
13    This program is free software; you can redistribute it and/or
14    modify it under the terms of the GNU General Public License as
15    published by the Free Software Foundation; either version 2 of the
16    License, or (at your option) any later version.
17 
18    This program is distributed in the hope that it will be useful, but
19    WITHOUT ANY WARRANTY; without even the implied warranty of
20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
21    General Public License for more details.
22 
23    You should have received a copy of the GNU General Public License
24    along with this program; if not, write to the Free Software
25    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
26    02110-1301, USA.
27 
28    The GNU General Public License is contained in the file COPYING.
29 
30    Neither the names of the U.S. Department of Energy nor the
31    University of California nor the names of its contributors may be
32    used to endorse or promote products derived from this software
33    without prior written permission.
34 */
35 
36 #ifndef __LIBVEX_EMWARN_H
37 #define __LIBVEX_EMWARN_H
38 
39 
40 /* VEX can sometimes generate code which returns to the dispatcher
41    with the guest state pointer set to VEX_TRC_JMP_EMWARN.  This means
42    that VEX is trying to warn Valgrind that it is doing imprecise
43    emulation in some sense.  The guest's pseudo-register
44    "guest_EMWARN" will hold a value of type VexEmWarn, which describes
45    the nature of the warning.  Currently the limitations that are
46    warned about apply primarily to floating point support.
47 
48    All guest states should have a 32-bit (UInt) guest_EMWARN pseudo-
49    register, that emulation warnings can be written in to.
50 
51    Note that guest_EMWARN only carries a valid value at the jump
52    marked as VEX_TRC_JMP_EMWARN.  You can't assume it will continue to
53    carry a valid value from any amount of time after the jump.
54 */
55 
56 typedef
57    enum {
58       /* no warning indicated */
59       EmWarn_NONE=0,
60 
61       /* unmasking x87 FP exceptions is not supported */
62       EmWarn_X86_x87exns,
63 
64       /* change of x87 FP precision away from 64-bit (mantissa) */
65       EmWarn_X86_x87precision,
66 
67       /* unmasking SSE FP exceptions is not supported */
68       EmWarn_X86_sseExns,
69 
70       /* setting mxcsr.fz is not supported */
71       EmWarn_X86_fz,
72 
73       /* setting mxcsr.daz is not supported */
74       EmWarn_X86_daz,
75 
76       /* settings to %eflags.ac (alignment check) are noted but ignored */
77       EmWarn_X86_acFlag,
78 
79       /* unmasking PPC32/64 FP exceptions is not supported */
80       EmWarn_PPCexns,
81 
82       /* overflow/underflow of the PPC64 _REDIR stack (ppc64 only) */
83       EmWarn_PPC64_redir_overflow,
84       EmWarn_PPC64_redir_underflow,
85 
86       EmWarn_NUMBER
87    }
88    VexEmWarn;
89 
90 
91 /* Produces a short string describing the warning. */
92 extern HChar* LibVEX_EmWarn_string ( VexEmWarn );
93 
94 
95 #endif /* ndef __LIBVEX_EMWARN_H */
96 
97 /*---------------------------------------------------------------*/
98 /*---                                         libvex_emwarn.h ---*/
99 /*---------------------------------------------------------------*/
100