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authorAndreas Jaeger <aj@suse.de>2002-03-17 12:07:44 +0000
committerAndreas Jaeger <aj@suse.de>2002-03-17 12:07:44 +0000
commit9ea502f95ca8fb4e744e354030292d1c3f34a485 (patch)
treeeb0417a8f7c0cf1045390a0770a4822c93dcbd43
parenteea4471dd408af985c2d5664ee908e3284097451 (diff)
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* sysdeps/mips/fpu/fraiseexcpt.c (__feraiseexcept): Set cause bits.
* sysdeps/mips/fpu/fgetexcptflg.c (__fegetexceptflag): Add comment. * sysdeps/mips/fpu/fclrexcpt.c (__feclearexcept): Clear also cause bits. * sysdeps/mips/fpu/fenv_libc.h (CAUSE_MASK): New. (CAUSE_SHIFT): New.
-rw-r--r--sysdeps/mips/fpu/fclrexcpt.c11
-rw-r--r--sysdeps/mips/fpu/fenv_libc.h13
-rw-r--r--sysdeps/mips/fpu/fgetexcptflg.c6
-rw-r--r--sysdeps/mips/fpu/fraiseexcpt.c12
4 files changed, 30 insertions, 12 deletions
diff --git a/sysdeps/mips/fpu/fclrexcpt.c b/sysdeps/mips/fpu/fclrexcpt.c
index 9fb2d7e803..2c35047a8c 100644
--- a/sysdeps/mips/fpu/fclrexcpt.c
+++ b/sysdeps/mips/fpu/fclrexcpt.c
@@ -1,5 +1,5 @@
/* Clear given exceptions in current floating-point environment.
- Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
+ Copyright (C) 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>, 1998.
@@ -19,6 +19,7 @@
02111-1307 USA. */
#include <fenv.h>
+#include <fenv_libc.h>
#include <fpu_control.h>
#include <shlib-compat.h>
@@ -33,8 +34,11 @@ __feclearexcept (int excepts)
/* Read the complete control word. */
_FPU_GETCW (cw);
- /* Clear exception bits. */
- cw &= ~excepts;
+ /* Clear exception flag bits and cause bits. If the cause bit is not
+ cleared, the next CTC instruction (just below) will re-generate
+ the exception. */
+
+ cw &= ~(excepts | (excepts << CAUSE_SHIFT));
/* Put the new data in effect. */
_FPU_SETCW (cw);
@@ -42,6 +46,7 @@ __feclearexcept (int excepts)
/* Success. */
return 0;
}
+
#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
strong_alias (__feclearexcept, __old_feclearexcept)
compat_symbol (libm, __old_feclearexcept, feclearexcept, GLIBC_2_1);
diff --git a/sysdeps/mips/fpu/fenv_libc.h b/sysdeps/mips/fpu/fenv_libc.h
index dc30888ada..d971d2c711 100644
--- a/sysdeps/mips/fpu/fenv_libc.h
+++ b/sysdeps/mips/fpu/fenv_libc.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2000 Free Software Foundation, Inc.
+/* Copyright (C) 2000, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>.
@@ -20,10 +20,13 @@
#ifndef _FENV_LIBC_H
#define _FENV_LIBC_H 1
-/* Mask for enabling exceptions. */
-#define ENABLE_MASK 0xF80U
+/* Mask for enabling exceptions and for the CAUSE bits. */
+#define ENABLE_MASK 0x00F80U
+#define CAUSE_MASK 0x1F000U
+
+/* Shift for FE_* flags to get up to the ENABLE bits and the CAUSE bits. */
+#define ENABLE_SHIFT 5
+#define CAUSE_SHIFT 10
-/* Shift for FE_* flags. */
-#define ENABLE_SHIFT 5
#endif /* _FENV_LIBC_H */
diff --git a/sysdeps/mips/fpu/fgetexcptflg.c b/sysdeps/mips/fpu/fgetexcptflg.c
index d4bbfc3a2a..4f802afb40 100644
--- a/sysdeps/mips/fpu/fgetexcptflg.c
+++ b/sysdeps/mips/fpu/fgetexcptflg.c
@@ -1,5 +1,5 @@
/* Store current representation for exceptions.
- Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
+ Copyright (C) 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>, 1998.
@@ -30,6 +30,10 @@ __fegetexceptflag (fexcept_t *flagp, int excepts)
/* Get the current exceptions. */
_FPU_GETCW (temp);
+ /* It is important that the CAUSE bits are not saved here. If they
+ were, a call to fesetexceptflag() would generate an
+ exception. */
+
*flagp = temp & excepts & FE_ALL_EXCEPT;
/* Success. */
diff --git a/sysdeps/mips/fpu/fraiseexcpt.c b/sysdeps/mips/fpu/fraiseexcpt.c
index 582210aca3..e2472e35f2 100644
--- a/sysdeps/mips/fpu/fraiseexcpt.c
+++ b/sysdeps/mips/fpu/fraiseexcpt.c
@@ -1,5 +1,5 @@
/* Raise given exceptions.
- Copyright (C) 2000 Free Software Foundation, Inc.
+ Copyright (C) 2000, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>, 2000.
@@ -19,6 +19,7 @@
02111-1307 USA. */
#include <fenv.h>
+#include <fenv_libc.h>
#include <fpu_control.h>
#include <shlib-compat.h>
@@ -30,8 +31,13 @@ __feraiseexcept (int excepts)
/* Get current state. */
_FPU_GETCW (cw);
- /* Set exceptions bits. */
- cw |= (excepts & FE_ALL_EXCEPT);
+ /* Set flag bits (which are accumulative), and *also* set the cause
+ bits. The setting of the cause bits is what actually causes the
+ hardware to generate the exception, if the corresponding enable
+ bit is set as well. */
+
+ excepts &= FE_ALL_EXCEPT;
+ cw |= excepts | (excepts << CAUSE_SHIFT);
/* Set new state. */
_FPU_SETCW (cw);