10495 libc should know how many FPU exceptions there are

Reviewed by: Jason King <jason.king@joyent.com>
Reviewed by: Igor Kozhukhov <igor@dilos.org>
Reviewed by: Gergő Mihály Doma <domag02@gmail.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Approved by: Gordon Ross <gwr@nexenta.com>

4 files changed, 17 insertions, 10 deletions

diff --git a/usr/src/head/floatingpoint.h b/usr/src/head/floatingpoint.h
index 1935b611c6..c8d658cc83 100644
--- a/usr/src/head/floatingpoint.h
+++ b/usr/src/head/floatingpoint.h
@@ -62,8 +62,6 @@ extern "C" {
 typedef	__FILE FILE;
 #endif
 
-#define	N_IEEE_EXCEPTION 5	/* Number of floating-point exceptions. */
-
 typedef int sigfpe_code_type;	/* Type of SIGFPE code. */
 
 typedef void (*sigfpe_handler_type)();	/* Pointer to exception handler */
diff --git a/usr/src/lib/libc/port/fp/sigfpe.c b/usr/src/lib/libc/port/fp/sigfpe.c
index 9b1942423f..dca4e3428a 100644
--- a/usr/src/lib/libc/port/fp/sigfpe.c
+++ b/usr/src/lib/libc/port/fp/sigfpe.c
@@ -150,6 +150,11 @@ _sigfpe_master(int sig, siginfo_t *siginfo, void *arg)
 		case FPE_FLTOVF:
 			exception = fp_overflow;
 			goto ieee;
+#if defined(__i386) || defined(__amd64)
+		case FPE_FLTDEN:
+			exception = fp_denormalized;
+			goto ieee;
+#endif
 		default:	/* The common default treatment is to abort. */
 			break;
 		}
diff --git a/usr/src/man/man3c/sigfpe.3c b/usr/src/man/man3c/sigfpe.3c
index 5f40071c75..2067e19301 100644
--- a/usr/src/man/man3c/sigfpe.3c
+++ b/usr/src/man/man3c/sigfpe.3c
@@ -17,7 +17,6 @@ sigfpe \- signal handling for specific SIGFPE codes
 .fi
 
 .SH DESCRIPTION
-.sp
 .LP
 The \fBsigfpe()\fR function allows signal handling to be specified for
 particular \fBSIGFPE\fR codes.  A call to \fBsigfpe()\fR defines a new handler
@@ -41,6 +40,15 @@ FPE_FLTOVF   fp_overflow \(mi floating-point overflow
 FPE_FLTINV   fp_invalid \(mi floating-point invalid operation
 .fi
 .in -2
+.LP
+And additionally on the x86 architecture:
+.sp
+.in +2
+.nf
+FPE_FLTDEN   fp_denormalized \(mi floating-point denormalized result
+.fi
+.in -2
+
 
 .sp
 .LP
@@ -140,7 +148,6 @@ main(void) {
 .in -2
 
 .SH FILES
-.sp
 .ne 2
 .na
 \fB\fB/usr/include/floatingpoint.h\fR\fR
@@ -161,7 +168,6 @@ main(void) {
 .RE
 
 .SH ATTRIBUTES
-.sp
 .LP
 See \fBattributes\fR(5) for descriptions of the following attributes:
 .sp
@@ -177,12 +183,10 @@ MT-Level	Safe
 .TE
 
 .SH SEE ALSO
-.sp
 .LP
 \fBsigaction\fR(2), \fBabort\fR(3C), \fBsignal\fR(3C), \fBattributes\fR(5),
 \fBfloatingpoint.h\fR(3HEAD)
 .SH DIAGNOSTICS
-.sp
 .LP
 The \fBsigfpe()\fR function returns (void(*)())-1 if \fIcode\fR is not zero or
 a defined \fBSIGFPE\fR code.
diff --git a/usr/src/uts/common/sys/ieeefp.h b/usr/src/uts/common/sys/ieeefp.h
index 9b47e6ce47..2ee4ec4d51 100644
--- a/usr/src/uts/common/sys/ieeefp.h
+++ b/usr/src/uts/common/sys/ieeefp.h
@@ -27,8 +27,6 @@
 #ifndef _SYS_IEEEFP_H
 #define	_SYS_IEEEFP_H
 
-#pragma ident	"%Z%%M%	%I%	%E% SMI"	/* SunOS4.0 1.6	*/
-
 #ifdef	__cplusplus
 extern "C" {
 #endif
@@ -60,6 +58,7 @@ enum fp_exception_type {	/* exceptions according to bit number */
 	fp_overflow	= 3,
 	fp_invalid	= 4
 };
+#define	N_IEEE_EXCEPTION 5	/* Number of floating-point exceptions. */
 
 enum fp_trap_enable_type {	/* trap enable bits according to bit number */
 	fp_trap_inexact	= 0,
@@ -93,6 +92,7 @@ enum fp_exception_type {	/* exceptions according to bit number */
 	fp_underflow	= 4,
 	fp_inexact	= 5
 };
+#define	N_IEEE_EXCEPTION 6	/* Number of floating-point exceptions. */
 
 enum fp_trap_enable_type {	/* trap enable bits according to bit number */
 	fp_trap_invalid	= 0,
@@ -109,7 +109,7 @@ enum fp_class_type {		/* floating-point classes */
 	fp_zero		= 0,
 	fp_subnormal	= 1,
 	fp_normal	= 2,
-	fp_infinity   	= 3,
+	fp_infinity	= 3,
 	fp_quiet	= 4,
 	fp_signaling	= 5
 };