arm: fix signal handler

R=ken2
CC=golang-dev
https://golang.org/cl/2670042

src/pkg/Makefile

@@ -207,8 +207,6 @@ ifeq ($(GOARCH),arm)
 NOTEST+=cmath        # software floating point (lack of) accuracy
 NOTEST+=math         # software floating point (lack of) accuracy
 NOTEST+=strconv      # software floating point (lack of) accuracy
-
-NOTEST+=os/signal    # crash
 endif
 
 TEST=\

src/pkg/runtime/linux/arm/defs.h

@@ -45,19 +45,19 @@ enum {
 	SIGIO = 0x1d,
 	SIGPWR = 0x1e,
 	SIGSYS = 0x1f,
-	FPE_INTDIV = 0x30001,
-	FPE_INTOVF = 0x30002,
-	FPE_FLTDIV = 0x30003,
-	FPE_FLTOVF = 0x30004,
-	FPE_FLTUND = 0x30005,
-	FPE_FLTRES = 0x30006,
-	FPE_FLTINV = 0x30007,
-	FPE_FLTSUB = 0x30008,
-	BUS_ADRALN = 0x30001,
-	BUS_ADRERR = 0x30002,
-	BUS_OBJERR = 0x30003,
-	SEGV_MAPERR = 0x30001,
-	SEGV_ACCERR = 0x30002,
+	FPE_INTDIV = 0x1,
+	FPE_INTOVF = 0x2,
+	FPE_FLTDIV = 0x3,
+	FPE_FLTOVF = 0x4,
+	FPE_FLTUND = 0x5,
+	FPE_FLTRES = 0x6,
+	FPE_FLTINV = 0x7,
+	FPE_FLTSUB = 0x8,
+	BUS_ADRALN = 0x1,
+	BUS_ADRERR = 0x2,
+	BUS_OBJERR = 0x3,
+	SEGV_MAPERR = 0x1,
+	SEGV_ACCERR = 0x2,
 };
 
 // Types

src/pkg/runtime/linux/arm/sys.s

@@ -147,7 +147,7 @@ TEXT clone(SB),7,$0
 	MOVW	$1234, R1
 	CMP	R0, R1
 	BEQ	2(PC)
-	B	abort(SB)
+	BL	abort(SB)
 
 	MOVW	0(R13), m
 	MOVW	4(R13), g
@@ -196,11 +196,6 @@ TEXT sigaltstack(SB),7,$0
 TEXT sigignore(SB),7,$0
 	RET
 
-TEXT sigreturn(SB),7,$0
-	MOVW	R0, R0
-	B	abort(SB)
-	RET
-
 TEXT sigtramp(SB),7,$24
 	MOVW	m_gsignal(m), g
 	MOVW	R0, 4(R13)

src/pkg/runtime/linux/defs_arm.c

@@ -69,21 +69,21 @@ enum {
 	$SIGPWR = SIGPWR,
 	$SIGSYS = SIGSYS,
 
-	$FPE_INTDIV = FPE_INTDIV,
-	$FPE_INTOVF = FPE_INTOVF,
-	$FPE_FLTDIV = FPE_FLTDIV,
-	$FPE_FLTOVF = FPE_FLTOVF,
-	$FPE_FLTUND = FPE_FLTUND,
-	$FPE_FLTRES = FPE_FLTRES,
-	$FPE_FLTINV = FPE_FLTINV,
-	$FPE_FLTSUB = FPE_FLTSUB,
+	$FPE_INTDIV = FPE_INTDIV & 0xFFFF,
+	$FPE_INTOVF = FPE_INTOVF & 0xFFFF,
+	$FPE_FLTDIV = FPE_FLTDIV & 0xFFFF,
+	$FPE_FLTOVF = FPE_FLTOVF & 0xFFFF,
+	$FPE_FLTUND = FPE_FLTUND & 0xFFFF,
+	$FPE_FLTRES = FPE_FLTRES & 0xFFFF,
+	$FPE_FLTINV = FPE_FLTINV & 0xFFFF,
+	$FPE_FLTSUB = FPE_FLTSUB & 0xFFFF,
 	
-	$BUS_ADRALN = BUS_ADRALN,
-	$BUS_ADRERR = BUS_ADRERR,
-	$BUS_OBJERR = BUS_OBJERR,
+	$BUS_ADRALN = BUS_ADRALN & 0xFFFF,
+	$BUS_ADRERR = BUS_ADRERR & 0xFFFF,
+	$BUS_OBJERR = BUS_OBJERR & 0xFFFF,
 	
-	$SEGV_MAPERR = SEGV_MAPERR,
-	$SEGV_ACCERR = SEGV_ACCERR,
+	$SEGV_MAPERR = SEGV_MAPERR & 0xFFFF,
+	$SEGV_ACCERR = SEGV_ACCERR & 0xFFFF,
 };
 
 typedef sigset_t $Sigset;