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authorBorislav Petkov <bp@suse.de>2016-05-30 12:56:27 +0200
committerIngo Molnar <mingo@kernel.org>2016-06-08 15:01:02 +0200
commitf5967101e9de12addcda4510dfbac66d7c5779c3 (patch)
tree2f01f9e5eb430728ebecd5abff9851fafb5c8c62
parent08dd8cd06ed95625b9e2fac43c78fcb45b7eaf94 (diff)
x86/hweight: Get rid of the special calling convention
People complained about ARCH_HWEIGHT_CFLAGS and how it throws a wrench into kcov, lto, etc, experimentations. Add asm versions for __sw_hweight{32,64}() and do explicit saving and restoring of clobbered registers. This gets rid of the special calling convention. We get to call those functions on !X86_FEATURE_POPCNT CPUs. We still need to hardcode POPCNT and register operands as some old gas versions which we support, do not know about POPCNT. Btw, remove redundant REX prefix from 32-bit POPCNT because alternatives can do padding now. Suggested-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1464605787-20603-1-git-send-email-bp@alien8.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r--arch/x86/Kconfig5
-rw-r--r--arch/x86/include/asm/arch_hweight.h24
-rw-r--r--arch/x86/kernel/i386_ksyms_32.c2
-rw-r--r--arch/x86/kernel/x8664_ksyms_64.c3
-rw-r--r--arch/x86/lib/Makefile2
-rw-r--r--arch/x86/lib/hweight.S77
-rw-r--r--lib/Makefile5
-rw-r--r--lib/hweight.c4
8 files changed, 97 insertions, 25 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0a7b885964ba..729d41d9ced3 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -294,11 +294,6 @@ config X86_32_LAZY_GS
def_bool y
depends on X86_32 && !CC_STACKPROTECTOR
-config ARCH_HWEIGHT_CFLAGS
- string
- default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
- default "-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx -fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10 -fcall-saved-r11" if X86_64
-
config ARCH_SUPPORTS_UPROBES
def_bool y
diff --git a/arch/x86/include/asm/arch_hweight.h b/arch/x86/include/asm/arch_hweight.h
index 02e799fa43d1..e7cd63175de4 100644
--- a/arch/x86/include/asm/arch_hweight.h
+++ b/arch/x86/include/asm/arch_hweight.h
@@ -4,8 +4,8 @@
#include <asm/cpufeatures.h>
#ifdef CONFIG_64BIT
-/* popcnt %edi, %eax -- redundant REX prefix for alignment */
-#define POPCNT32 ".byte 0xf3,0x40,0x0f,0xb8,0xc7"
+/* popcnt %edi, %eax */
+#define POPCNT32 ".byte 0xf3,0x0f,0xb8,0xc7"
/* popcnt %rdi, %rax */
#define POPCNT64 ".byte 0xf3,0x48,0x0f,0xb8,0xc7"
#define REG_IN "D"
@@ -17,19 +17,15 @@
#define REG_OUT "a"
#endif
-/*
- * __sw_hweightXX are called from within the alternatives below
- * and callee-clobbered registers need to be taken care of. See
- * ARCH_HWEIGHT_CFLAGS in <arch/x86/Kconfig> for the respective
- * compiler switches.
- */
+#define __HAVE_ARCH_SW_HWEIGHT
+
static __always_inline unsigned int __arch_hweight32(unsigned int w)
{
- unsigned int res = 0;
+ unsigned int res;
asm (ALTERNATIVE("call __sw_hweight32", POPCNT32, X86_FEATURE_POPCNT)
- : "="REG_OUT (res)
- : REG_IN (w));
+ : "="REG_OUT (res)
+ : REG_IN (w));
return res;
}
@@ -53,11 +49,11 @@ static inline unsigned long __arch_hweight64(__u64 w)
#else
static __always_inline unsigned long __arch_hweight64(__u64 w)
{
- unsigned long res = 0;
+ unsigned long res;
asm (ALTERNATIVE("call __sw_hweight64", POPCNT64, X86_FEATURE_POPCNT)
- : "="REG_OUT (res)
- : REG_IN (w));
+ : "="REG_OUT (res)
+ : REG_IN (w));
return res;
}
diff --git a/arch/x86/kernel/i386_ksyms_32.c b/arch/x86/kernel/i386_ksyms_32.c
index 64341aa485ae..d40ee8a38fed 100644
--- a/arch/x86/kernel/i386_ksyms_32.c
+++ b/arch/x86/kernel/i386_ksyms_32.c
@@ -42,3 +42,5 @@ EXPORT_SYMBOL(empty_zero_page);
EXPORT_SYMBOL(___preempt_schedule);
EXPORT_SYMBOL(___preempt_schedule_notrace);
#endif
+
+EXPORT_SYMBOL(__sw_hweight32);
diff --git a/arch/x86/kernel/x8664_ksyms_64.c b/arch/x86/kernel/x8664_ksyms_64.c
index cd05942bc918..f1aebfb49c36 100644
--- a/arch/x86/kernel/x8664_ksyms_64.c
+++ b/arch/x86/kernel/x8664_ksyms_64.c
@@ -44,6 +44,9 @@ EXPORT_SYMBOL(clear_page);
EXPORT_SYMBOL(csum_partial);
+EXPORT_SYMBOL(__sw_hweight32);
+EXPORT_SYMBOL(__sw_hweight64);
+
/*
* Export string functions. We normally rely on gcc builtin for most of these,
* but gcc sometimes decides not to inline them.
diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
index 72a576752a7e..ec969cc3eb20 100644
--- a/arch/x86/lib/Makefile
+++ b/arch/x86/lib/Makefile
@@ -25,7 +25,7 @@ lib-y += memcpy_$(BITS).o
lib-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem.o
lib-$(CONFIG_INSTRUCTION_DECODER) += insn.o inat.o
-obj-y += msr.o msr-reg.o msr-reg-export.o
+obj-y += msr.o msr-reg.o msr-reg-export.o hweight.o
ifeq ($(CONFIG_X86_32),y)
obj-y += atomic64_32.o
diff --git a/arch/x86/lib/hweight.S b/arch/x86/lib/hweight.S
new file mode 100644
index 000000000000..02de3d74d2c5
--- /dev/null
+++ b/arch/x86/lib/hweight.S
@@ -0,0 +1,77 @@
+#include <linux/linkage.h>
+
+#include <asm/asm.h>
+
+/*
+ * unsigned int __sw_hweight32(unsigned int w)
+ * %rdi: w
+ */
+ENTRY(__sw_hweight32)
+
+#ifdef CONFIG_X86_64
+ movl %edi, %eax # w
+#endif
+ __ASM_SIZE(push,) %__ASM_REG(dx)
+ movl %eax, %edx # w -> t
+ shrl %edx # t >>= 1
+ andl $0x55555555, %edx # t &= 0x55555555
+ subl %edx, %eax # w -= t
+
+ movl %eax, %edx # w -> t
+ shrl $2, %eax # w_tmp >>= 2
+ andl $0x33333333, %edx # t &= 0x33333333
+ andl $0x33333333, %eax # w_tmp &= 0x33333333
+ addl %edx, %eax # w = w_tmp + t
+
+ movl %eax, %edx # w -> t
+ shrl $4, %edx # t >>= 4
+ addl %edx, %eax # w_tmp += t
+ andl $0x0f0f0f0f, %eax # w_tmp &= 0x0f0f0f0f
+ imull $0x01010101, %eax, %eax # w_tmp *= 0x01010101
+ shrl $24, %eax # w = w_tmp >> 24
+ __ASM_SIZE(pop,) %__ASM_REG(dx)
+ ret
+ENDPROC(__sw_hweight32)
+
+ENTRY(__sw_hweight64)
+#ifdef CONFIG_X86_64
+ pushq %rdx
+
+ movq %rdi, %rdx # w -> t
+ movabsq $0x5555555555555555, %rax
+ shrq %rdx # t >>= 1
+ andq %rdx, %rax # t &= 0x5555555555555555
+ movabsq $0x3333333333333333, %rdx
+ subq %rax, %rdi # w -= t
+
+ movq %rdi, %rax # w -> t
+ shrq $2, %rdi # w_tmp >>= 2
+ andq %rdx, %rax # t &= 0x3333333333333333
+ andq %rdi, %rdx # w_tmp &= 0x3333333333333333
+ addq %rdx, %rax # w = w_tmp + t
+
+ movq %rax, %rdx # w -> t
+ shrq $4, %rdx # t >>= 4
+ addq %rdx, %rax # w_tmp += t
+ movabsq $0x0f0f0f0f0f0f0f0f, %rdx
+ andq %rdx, %rax # w_tmp &= 0x0f0f0f0f0f0f0f0f
+ movabsq $0x0101010101010101, %rdx
+ imulq %rdx, %rax # w_tmp *= 0x0101010101010101
+ shrq $56, %rax # w = w_tmp >> 56
+
+ popq %rdx
+ ret
+#else /* CONFIG_X86_32 */
+ /* We're getting an u64 arg in (%eax,%edx): unsigned long hweight64(__u64 w) */
+ pushl %ecx
+
+ call __sw_hweight32
+ movl %eax, %ecx # stash away result
+ movl %edx, %eax # second part of input
+ call __sw_hweight32
+ addl %ecx, %eax # result
+
+ popl %ecx
+ ret
+#endif
+ENDPROC(__sw_hweight64)
diff --git a/lib/Makefile b/lib/Makefile
index ff6a7a6c6395..07d06a8b9788 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -15,9 +15,6 @@ KCOV_INSTRUMENT_rbtree.o := n
KCOV_INSTRUMENT_list_debug.o := n
KCOV_INSTRUMENT_debugobjects.o := n
KCOV_INSTRUMENT_dynamic_debug.o := n
-# Kernel does not boot if we instrument this file as it uses custom calling
-# convention (see CONFIG_ARCH_HWEIGHT_CFLAGS).
-KCOV_INSTRUMENT_hweight.o := n
lib-y := ctype.o string.o vsprintf.o cmdline.o \
rbtree.o radix-tree.o dump_stack.o timerqueue.o\
@@ -74,8 +71,6 @@ obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o
obj-$(CONFIG_CHECK_SIGNATURE) += check_signature.o
obj-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o
-GCOV_PROFILE_hweight.o := n
-CFLAGS_hweight.o = $(subst $(quote),,$(CONFIG_ARCH_HWEIGHT_CFLAGS))
obj-$(CONFIG_GENERIC_HWEIGHT) += hweight.o
obj-$(CONFIG_BTREE) += btree.o
diff --git a/lib/hweight.c b/lib/hweight.c
index 9a5c1f221558..43273a7d83cf 100644
--- a/lib/hweight.c
+++ b/lib/hweight.c
@@ -9,6 +9,7 @@
* The Hamming Weight of a number is the total number of bits set in it.
*/
+#ifndef __HAVE_ARCH_SW_HWEIGHT
unsigned int __sw_hweight32(unsigned int w)
{
#ifdef CONFIG_ARCH_HAS_FAST_MULTIPLIER
@@ -25,6 +26,7 @@ unsigned int __sw_hweight32(unsigned int w)
#endif
}
EXPORT_SYMBOL(__sw_hweight32);
+#endif
unsigned int __sw_hweight16(unsigned int w)
{
@@ -43,6 +45,7 @@ unsigned int __sw_hweight8(unsigned int w)
}
EXPORT_SYMBOL(__sw_hweight8);
+#ifndef __HAVE_ARCH_SW_HWEIGHT
unsigned long __sw_hweight64(__u64 w)
{
#if BITS_PER_LONG == 32
@@ -65,3 +68,4 @@ unsigned long __sw_hweight64(__u64 w)
#endif
}
EXPORT_SYMBOL(__sw_hweight64);
+#endif