svn commit: r251514 - head/lib/libc/arm/gen
Andrew Turner
andrew at FreeBSD.org
Fri Jun 7 22:01:07 UTC 2013
Author: andrew
Date: Fri Jun 7 22:01:06 2013
New Revision: 251514
URL: http://svnweb.freebsd.org/changeset/base/251514
Log:
Finish pulling in the NetBSD setjmp/longjmp updates on ARM.
Store/restore the VFP registers in setjmp/longjmp on ARM EABI if VFP is
enabled in the kernel. It checks the hw.floatingpoint sysctl to see if
floating-point is available and uses this to determine if it should store
them. If it does it uses a different magic value so longjmp is able to know
if it should load them.
Added:
head/lib/libc/arm/gen/arm_initfini.c (contents, props changed)
Modified:
head/lib/libc/arm/gen/Makefile.inc
head/lib/libc/arm/gen/_setjmp.S
head/lib/libc/arm/gen/setjmp.S
Modified: head/lib/libc/arm/gen/Makefile.inc
==============================================================================
--- head/lib/libc/arm/gen/Makefile.inc Fri Jun 7 21:51:10 2013 (r251513)
+++ head/lib/libc/arm/gen/Makefile.inc Fri Jun 7 22:01:06 2013 (r251514)
@@ -3,7 +3,8 @@
SRCS+= _ctx_start.S _setjmp.S _set_tp.c alloca.S fabs.c \
getcontextx.c infinity.c ldexp.c makecontext.c \
- __aeabi_read_tp.S setjmp.S signalcontext.c sigsetjmp.S flt_rounds.c
+ __aeabi_read_tp.S setjmp.S signalcontext.c sigsetjmp.S flt_rounds.c \
+ arm_initfini.c
.if ${MK_ARM_EABI} == "no"
SRCS+= divsi3.S
Modified: head/lib/libc/arm/gen/_setjmp.S
==============================================================================
--- head/lib/libc/arm/gen/_setjmp.S Fri Jun 7 21:51:10 2013 (r251513)
+++ head/lib/libc/arm/gen/_setjmp.S Fri Jun 7 22:01:06 2013 (r251514)
@@ -36,7 +36,7 @@
#error FPA is not supported anymore
#endif
-#ifdef __ARM_EABI__
+#if defined(__ARM_EABI__) && !defined(_STANDALONE)
.fpu vfp
#endif
@@ -61,6 +61,26 @@ __FBSDID("$FreeBSD$");
ENTRY(_setjmp)
ldr r1, .L_setjmp_magic
+#if defined(__ARM_EABI__) && !defined(_STANDALONE)
+ ldr r2, .Lfpu_present
+#ifdef PIC
+ GOT_INIT(r3, .L_setjmp_got, .L_setjmp_gotinit)
+ ldr r2, [r2, r3]
+#else
+ ldr r2, [r2]
+#endif
+ teq r2, #0 /* do we have a FPU? */
+ beq 1f /* no, don't save VFP registers */
+
+ orr r1, r1, #(_JB_MAGIC__SETJMP ^ _JB_MAGIC__SETJMP_VFP)
+ /* change magic to VFP magic */
+ add r2, r0, #(_JB_REG_D8 * 4)
+ vstmia r2, {d8-d15}
+ vmrs r2, fpscr
+ str r2, [r0, #(_JB_REG_FPSCR * 4)]
+1:
+#endif /* __ARM_EABI__ */
+
str r1, [r0]
add r0, r0, #(_JB_REG_R4 * 4)
@@ -72,14 +92,31 @@ ENTRY(_setjmp)
.L_setjmp_magic:
.word _JB_MAGIC__SETJMP
+#if defined(__ARM_EABI__) && !defined(_STANDALONE)
+ GOT_INITSYM(.L_setjmp_got, .L_setjmp_gotinit)
+.Lfpu_present:
+ .word PIC_SYM(_libc_arm_fpu_present, GOTOFF)
+#endif /* __ARM_EABI__ */
WEAK_ALIAS(___longjmp, _longjmp)
ENTRY(_longjmp)
ldr r2, [r0] /* get magic from jmp_buf */
+ bic r3, r2, #(_JB_MAGIC__SETJMP ^ _JB_MAGIC__SETJMP_VFP)
+ /* ignore VFP-ness of magic */
ldr ip, .L_setjmp_magic /* load magic */
- teq ip, r2 /* magic correct? */
+ teq ip, r3 /* magic correct? */
bne botch /* no, botch */
+#if defined(__ARM_EABI__) && !defined(_STANDALONE)
+ teq r3, r2 /* did magic change? */
+ beq 1f /* no, don't restore VFP */
+ add ip, r0, #(_JB_REG_D8 * 4)
+ vldmia ip, {d8-d15}
+ ldr ip, [r0, #(_JB_REG_FPSCR * 4)]
+ vmsr fpscr, ip
+1:
+#endif /* __ARM_EABI__ */
+
add r0, r0, #(_JB_REG_R4 * 4)
/* Restore integer registers */
ldmia r0, {r4-r14}
Added: head/lib/libc/arm/gen/arm_initfini.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/lib/libc/arm/gen/arm_initfini.c Fri Jun 7 22:01:06 2013 (r251514)
@@ -0,0 +1,78 @@
+/*-
+ * Copyright (c) 2013 The NetBSD Foundation, Inc.
+ * Copyright (c) 2013 Andrew Turner
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matt Thomas of 3am Software Foundry.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Bases on NetBSD lib/libc/arch/arm/misc/arm_initfini.c
+ * $NetBSD: arm_initfini.c,v 1.2 2013/01/31 06:47:55 matt Exp $
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * To properly implement setjmp/longjmp for the ARM AAPCS ABI, it has to be
+ * aware of whether there is a FPU is present or not. Regardless of whether
+ * the hard-float ABI is being used, setjmp needs to save D8-D15. But it can
+ * only do this if those instructions won't cause an exception.
+ */
+
+#include <sys/param.h>
+#include <sys/sysctl.h>
+
+#include <stdbool.h>
+#include <stddef.h>
+
+extern int __sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp,
+ void *newp, size_t newlen);
+
+int _libc_arm_fpu_present;
+static bool _libc_aapcs_initialized;
+
+void _libc_aapcs_init(void) __attribute__((__constructor__, __used__));
+
+void
+_libc_aapcs_init(void)
+{
+ int mib[2];
+ size_t len;
+
+ if (_libc_aapcs_initialized)
+ return;
+
+ mib[0] = CTL_HW;
+ mib[1] = HW_FLOATINGPT;
+
+ len = sizeof(_libc_arm_fpu_present);
+ if (__sysctl(mib, 2, &_libc_arm_fpu_present, &len, NULL, 0) == -1 ||
+ len != sizeof(_libc_arm_fpu_present)) {
+ /* sysctl failed, assume no vfp */
+ _libc_arm_fpu_present = 0;
+ }
+
+ _libc_aapcs_initialized = true;
+}
Modified: head/lib/libc/arm/gen/setjmp.S
==============================================================================
--- head/lib/libc/arm/gen/setjmp.S Fri Jun 7 21:51:10 2013 (r251513)
+++ head/lib/libc/arm/gen/setjmp.S Fri Jun 7 22:01:06 2013 (r251514)
@@ -36,6 +36,10 @@
#error FPA is not supported anymore
#endif
+#ifdef __ARM_EABI__
+ .fpu vfp
+#endif
+
#include <machine/asm.h>
#include <machine/setjmp.h>
@@ -61,6 +65,27 @@ ENTRY(setjmp)
ldmfd sp!, {r0, r14}
ldr r1, .Lsetjmp_magic
+
+#ifdef __ARM_EABI__
+ ldr r2, .Lfpu_present
+#ifdef PIC
+ GOT_INIT(r3, .Lsetjmp_got, .Lsetjmp_gotinit)
+ ldr r2, [r2, r3]
+#else
+ ldr r2, [r2]
+#endif
+ teq r2, #0 /* do we have a FPU? */
+ beq 1f /* no, don't save VFP registers */
+
+ orr r1, r1, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP)
+ /* change magic to VFP magic */
+ add r2, r0, #(_JB_REG_D8 * 4)
+ vstmia r2, {d8-d15}
+ vmrs r2, fpscr
+ str r2, [r0, #(_JB_REG_FPSCR * 4)]
+1:
+#endif /* __ARM_EABI__ */
+
str r1, [r0] /* store magic */
/* Store integer registers */
@@ -71,6 +96,11 @@ ENTRY(setjmp)
.Lsetjmp_magic:
.word _JB_MAGIC_SETJMP
+#ifdef __ARM_EABI__
+ GOT_INITSYM(.Lsetjmp_got, .Lsetjmp_gotinit)
+.Lfpu_present:
+ .word PIC_SYM(_libc_arm_fpu_present, GOTOFF)
+#endif /* __ARM_EABI__ */
.weak _C_LABEL(longjmp)
@@ -78,7 +108,8 @@ ENTRY(setjmp)
ENTRY(__longjmp)
ldr r2, [r0]
ldr ip, .Lsetjmp_magic
- teq r2, ip
+ bic r3, r2, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP)
+ teq r3, ip
bne .Lbotch
/* Restore the signal mask. */
@@ -89,6 +120,17 @@ ENTRY(__longjmp)
bl PIC_SYM(_C_LABEL(sigprocmask), PLT)
ldmfd sp!, {r0-r2, r14}
+#ifdef __ARM_EABI__
+ tst r2, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP)
+ /* is this a VFP magic? */
+ beq 1f /* no, don't restore VFP */
+ add ip, r0, #(_JB_REG_D8 * 4)
+ vldmia ip, {d8-d15}
+ ldr ip, [r0, #(_JB_REG_FPSCR * 4)]
+ vmsr fpscr, ip
+1:
+#endif /* __ARM_EABI__ */
+
add r0, r0, #(_JB_REG_R4 * 4)
/* Restore integer registers */
ldmia r0, {r4-r14}
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