| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <1219323021-7273-2-git-send-email-galak@kernel.crashing.org>
Date: Thu, 21 Aug 2008 07:50:21 -0500
From: Kumar Gala <galak@...nel.crashing.org>
To: linux-kernel@...r.kernel.org
Cc: davem@...emloft.net, linuxppc-dev@...abs.org
Subject: [PATCH] math-emu: Add support for reporting exact invalid exception
Some architectures (like powerpc) provide status information on the exact
type of invalid exception. This is pretty straight forward as we already
report invalid exceptions via FP_SET_EXCEPTION.
We add new flags (FP_EX_INVALID_*) the architecture code can define if it
wants the exact invalid exception reported.
We had to split out the INF/INF and 0/0 cases for divide to allow reporting
the two invalid forms properly.
Signed-off-by: Kumar Gala <galak@...nel.crashing.org>
---
I intend these patches to go via the powerpc.git tree if no one has issues.
- k
include/math-emu/op-common.h | 12 ++++++++----
include/math-emu/soft-fp.h | 19 +++++++++++++++++++
2 files changed, 27 insertions(+), 4 deletions(-)
diff --git a/include/math-emu/op-common.h b/include/math-emu/op-common.h
index bb46e76..cc1ec39 100644
--- a/include/math-emu/op-common.h
+++ b/include/math-emu/op-common.h
@@ -73,7 +73,7 @@ do { \
X##_c = FP_CLS_NAN; \
/* Check for signaling NaN */ \
if (!(_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs)) \
- FP_SET_EXCEPTION(FP_EX_INVALID); \
+ FP_SET_EXCEPTION(FP_EX_INVALID | FP_EX_INVALID_SNAN); \
} \
break; \
} \
@@ -324,7 +324,7 @@ do { \
_FP_FRAC_SET_##wc(R, _FP_NANFRAC_##fs); \
R##_s = _FP_NANSIGN_##fs; \
R##_c = FP_CLS_NAN; \
- FP_SET_EXCEPTION(FP_EX_INVALID); \
+ FP_SET_EXCEPTION(FP_EX_INVALID | FP_EX_INVALID_ISI); \
break; \
} \
/* FALLTHRU */ \
@@ -431,7 +431,7 @@ do { \
R##_s = _FP_NANSIGN_##fs; \
R##_c = FP_CLS_NAN; \
_FP_FRAC_SET_##wc(R, _FP_NANFRAC_##fs); \
- FP_SET_EXCEPTION(FP_EX_INVALID); \
+ FP_SET_EXCEPTION(FP_EX_INVALID | FP_EX_INVALID_IMZ);\
break; \
\
default: \
@@ -490,11 +490,15 @@ do { \
break; \
\
case _FP_CLS_COMBINE(FP_CLS_INF,FP_CLS_INF): \
+ R##_s = _FP_NANSIGN_##fs; \
+ R##_c = FP_CLS_NAN; \
+ _FP_FRAC_SET_##wc(R, _FP_NANFRAC_##fs); \
+ FP_SET_EXCEPTION(FP_EX_INVALID | FP_EX_INVALID_IDI);\
case _FP_CLS_COMBINE(FP_CLS_ZERO,FP_CLS_ZERO): \
R##_s = _FP_NANSIGN_##fs; \
R##_c = FP_CLS_NAN; \
_FP_FRAC_SET_##wc(R, _FP_NANFRAC_##fs); \
- FP_SET_EXCEPTION(FP_EX_INVALID); \
+ FP_SET_EXCEPTION(FP_EX_INVALID | FP_EX_INVALID_ZDZ);\
break; \
\
default: \
diff --git a/include/math-emu/soft-fp.h b/include/math-emu/soft-fp.h
index a6f873b..3f284bc 100644
--- a/include/math-emu/soft-fp.h
+++ b/include/math-emu/soft-fp.h
@@ -51,6 +51,25 @@
#ifndef FP_EX_INVALID
#define FP_EX_INVALID 0
#endif
+#ifndef FP_EX_INVALID_SNAN
+#define FP_EX_INVALID_SNAN 0
+#endif
+/* inf - inf */
+#ifndef FP_EX_INVALID_ISI
+#define FP_EX_INVALID_ISI 0
+#endif
+/* inf / inf */
+#ifndef FP_EX_INVALID_IDI
+#define FP_EX_INVALID_IDI 0
+#endif
+/* 0 / 0 */
+#ifndef FP_EX_INVALID_ZDZ
+#define FP_EX_INVALID_ZDZ 0
+#endif
+/* inf * 0 */
+#ifndef FP_EX_INVALID_IMZ
+#define FP_EX_INVALID_IMZ 0
+#endif
#ifndef FP_EX_OVERFLOW
#define FP_EX_OVERFLOW 0
#endif
--
1.5.5.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists