diff --git a/mach/mips/libem/trp.s b/mach/mips/libem/trp.s
new file mode 100644
index 000000000..7801d471c
--- /dev/null
+++ b/mach/mips/libem/trp.s
@@ -0,0 +1,13 @@
+.sect .text
+.sect .rom
+.sect .data
+.sect .bss
+
+.define .trap_ecase
+.trap_ecase:
+	li	r3, 20			! ECASE = 20 in h/em_abs.h
+	! FALLTHROUGH to .trp
+
+.trap:
+	syscall
+
diff --git a/mach/mips/mcg/table b/mach/mips/mcg/table
index 24c362d7b..d9ec7a6ac 100644
--- a/mach/mips/mcg/table
+++ b/mach/mips/mcg/table
@@ -667,6 +667,10 @@ PATTERNS
 		emit "div.d %out, %left, %right"
 		cost 4;
 
+	out:(float)reg = NEGF.D(left:(float)reg)
+		emit "neg.d %out, %left"
+		cost 4;
+
 	out:(double)reg = FROMSI.D(in:(int)reg)
 		emit "mtc1 %in, %out" /* mtc1 has reversed parameters */
 		emit "cvt.d.w %out, %out"
@@ -705,6 +709,10 @@ PATTERNS
 		emit "div.d %out, %left, %right"
 		cost 4;
 
+	out:(float)reg = NEGF.F(left:(float)reg)
+		emit "neg.f %out, %left"
+		cost 4;
+
 	out:(float)reg = FROMSI.F(in:(int)reg)
 		emit "mtc1 %in, %out" /* mtc1 has reversed parameters */
 		emit "cvt.s.w %out, %out"