Save and restore the relevant FPU state on armv7.

ok deraadt@

3 files changed, 26 insertions, 28 deletions

diff --git a/lib/libc/arch/arm/Makefile.inc b/lib/libc/arch/arm/Makefile.inc
index 6ca8e6e4f51..4d470b67b1e 100644
--- a/lib/libc/arch/arm/Makefile.inc
+++ b/lib/libc/arch/arm/Makefile.inc
@@ -1,12 +1,10 @@
-# $OpenBSD: Makefile.inc,v 1.8 2018/02/28 11:16:54 kettenis Exp $
+# $OpenBSD: Makefile.inc,v 1.9 2018/06/22 15:18:50 kettenis Exp $
 # $NetBSD: Makefile.inc,v 1.5 2002/07/10 04:29:06 thorpej Exp $
 
 .include <bsd.own.mk>
 
 CERROR=	cerror.S
 
-CPPFLAGS += -DSOFTFLOAT
-
 # Override softfloat implementations of FP mode control functions
 .PATH: ${LIBCSRCDIR}/arch/${MACHINE_CPU}/gen
 
diff --git a/lib/libc/arch/arm/gen/_setjmp.S b/lib/libc/arch/arm/gen/_setjmp.S
index adc06de6ee9..4e6f05e5c40 100644
--- a/lib/libc/arch/arm/gen/_setjmp.S
+++ b/lib/libc/arch/arm/gen/_setjmp.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: _setjmp.S,v 1.5 2016/08/07 02:02:57 guenther Exp $	*/
+/*	$OpenBSD: _setjmp.S,v 1.6 2018/06/22 15:18:50 kettenis Exp $	*/
 /*	$NetBSD: _setjmp.S,v 1.5 2003/04/05 23:08:51 bjh21 Exp $	*/
 
 /*
@@ -69,13 +69,13 @@ ENTRY(_setjmp)
 	eor	r3, lr, r3			/* r3 = lr ^ __jmpxor[1] */
 
 #ifdef SOFTFLOAT
-	add	r0, r0, #52
+	add	r0, r0, #68
 #else
+	/* Store fpcsr */
+	vmrs	r1, fpscr
+	str	r1, [r0], #4
 	/* Store fp registers */
-	sfm	f4, 4, [r0], #48
-	/* Store fpsr */
-	rfs	r1
-	str	r1, [r0], #0x0004
+	vstmia	r0!, {d8-d15}
 #endif	/* SOFTFLOAT */
 	/* Store integer registers */
 	stmia	r0, {r2-r11}
@@ -98,13 +98,13 @@ ENTRY(_longjmp)
 	bne	botch
 
 #ifdef SOFTFLOAT
-	add	r0, r0, #52
+	add	r0, r0, #68
 #else
+	/* Restore fpcsr */
+	ldr	r4, [r0], #4
+	vmsr	fpscr, r4
 	/* Restore fp registers */
-	lfm	f4, 4, [r0], #48
-	/* Restore fpsr */
-	ldr	r4, [r0], #0x0004
-	wfs	r4
+	vldmia	r0!, {d8-d15}
 #endif	/* SOFTFLOAT */
 	/* Restore integer registers */
 	ldmia	r0, {r2-r11}
diff --git a/lib/libc/arch/arm/gen/setjmp.S b/lib/libc/arch/arm/gen/setjmp.S
index 7edb8b3d7f7..03ed693520c 100644
--- a/lib/libc/arch/arm/gen/setjmp.S
+++ b/lib/libc/arch/arm/gen/setjmp.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: setjmp.S,v 1.6 2016/08/07 02:02:57 guenther Exp $	*/
+/*	$OpenBSD: setjmp.S,v 1.7 2018/06/22 15:18:50 kettenis Exp $	*/
 /*	$NetBSD: setjmp.S,v 1.5 2003/04/05 23:08:51 bjh21 Exp $	*/
 
 /*
@@ -56,7 +56,7 @@ ENTRY(setjmp)
 	SYSTRAP(sigprocmask)
 
 	/* Store signal mask */
-	str	r0, [r2, #(25 * 4)]
+	str	r0, [r2, #(29 * 4)]
 
 	ldr	r1, .Lsetjmp_magic
 	str	r1, [r2], #4
@@ -69,14 +69,14 @@ ENTRY(setjmp)
 	eor	r3, lr, r3			/* r3 = lr ^ __jmpxor[1] */
 
 #ifdef SOFTFLOAT
-	add	r2, r2, #52
+	add	r2, r2, #68
 #else
+	/* Store fpcsr */
+	vmrs	r1, fpscr
+	str	r1, [r2], #4
 	/* Store fp registers */
-	sfm	f4, 4, [r2], #48
-	/* Store fpsr */
-	rfs	r1
-	str	r1, [r2], #0x0004
-#endif	/*SOFTFLOAT*/
+	vstmia	r2!, {d8-d15}
+#endif	/* SOFTFLOAT */
 	/* Store integer registers */
 	stmia	r2, {r3-r12}
 
@@ -101,19 +101,19 @@ ENTRY(longjmp)
 	/* Fetch signal mask and call sigprocmask */
 	mov	r3, r0				/* r3 = jmpbuf */
 	mov	r2, r1				/* r2 = retvalue */
-	ldr	r1, [r0, #(25 * 4)]
+	ldr	r1, [r0, #(29 * 4)]
 	mov	r0, #0x00000003			/* SIG_SETMASK */
 	SYSTRAP(sigprocmask)
 
 	add	r3, r3, #4
 #ifdef SOFTFLOAT
-	add	r3, r3, #52
+	add	r3, r3, #68
 #else
+	/* Restore fpcsr */
+	ldr	r4, [r3], #4
+	vmsr	fpscr, r4
 	/* Restore fp registers */
-	lfm	f4, 4, [r3], #48
-	/* Restore FPSR */
-	ldr	r4, [r3], #0x0004
-	wfs	r4
+	vldmia	r3!, {d8-d15}
 #endif	/* SOFTFLOAT */
 	/* Restore integer registers */
 	ldmia	r3, {r3-r12}