sync with uClibc

16 files changed, 530 insertions, 26 deletions

diff --git a/libc/string/arc/arcv2/memcpy.S b/libc/string/arc/arcv2/memcpy.S
new file mode 100644
index 000000000..7573daf51
--- /dev/null
+++ b/libc/string/arc/arcv2/memcpy.S
@@ -0,0 +1,236 @@
+/*
+ * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <features.h>
+#include <sysdep.h>
+
+#ifdef __LITTLE_ENDIAN__
+# define SHIFT_1(RX,RY,IMM)	asl	RX, RY, IMM	; <<
+# define SHIFT_2(RX,RY,IMM)	lsr	RX, RY, IMM	; >>
+# define MERGE_1(RX,RY,IMM)	asl	RX, RY, IMM
+# define MERGE_2(RX,RY,IMM)
+# define EXTRACT_1(RX,RY,IMM)	and	RX, RY, 0xFFFF
+# define EXTRACT_2(RX,RY,IMM)	lsr	RX, RY, IMM
+#else
+# define SHIFT_1(RX,RY,IMM)	lsr	RX, RY, IMM	; >>
+# define SHIFT_2(RX,RY,IMM)	asl	RX, RY, IMM	; <<
+# define MERGE_1(RX,RY,IMM)	asl	RX, RY, IMM	; <<
+# define MERGE_2(RX,RY,IMM)	asl	RX, RY, IMM	; <<
+# define EXTRACT_1(RX,RY,IMM)	lsr	RX, RY, IMM
+# define EXTRACT_2(RX,RY,IMM)	lsr	RX, RY, 0x08
+#endif
+
+#ifdef __LL64__
+# define PREFETCH_READ(RX)	prefetch [RX, 56]
+# define PREFETCH_WRITE(RX)	prefetchw [RX, 64]
+# define LOADX(DST,RX)		ldd.ab	DST, [RX, 8]
+# define STOREX(SRC,RX)		std.ab	SRC, [RX, 8]
+# define ZOLSHFT		5
+# define ZOLAND			0x1F
+#else
+# define PREFETCH_READ(RX)	prefetch [RX, 28]
+# define PREFETCH_WRITE(RX)	prefetchw [RX, 32]
+# define LOADX(DST,RX)		ld.ab	DST, [RX, 4]
+# define STOREX(SRC,RX)		st.ab	SRC, [RX, 4]
+# define ZOLSHFT		4
+# define ZOLAND			0xF
+#endif
+
+ENTRY(memcpy)
+	prefetch  [r1]		; Prefetch the read location
+	prefetchw [r0]		; Prefetch the write location
+	mov.f	0, r2
+;;; if size is zero
+	jz.d	[blink]
+	mov	r3, r0		; don't clobber ret val
+
+;;; if size <= 8
+	cmp	r2, 8
+	bls.d	@.Lsmallchunk
+	mov.f	lp_count, r2
+
+	and.f	r4, r0, 0x03
+	rsub	lp_count, r4, 4
+	lpnz	@.Laligndestination
+	;; LOOP BEGIN
+	ldb.ab	r5, [r1,1]
+	sub	r2, r2, 1
+	stb.ab	r5, [r3,1]
+.Laligndestination:
+
+;;; Check the alignment of the source
+	and.f	r4, r1, 0x03
+	bnz.d	@.Lsourceunaligned
+
+;;; CASE 0: Both source and destination are 32bit aligned
+;;; Convert len to Dwords, unfold x4
+	lsr.f	lp_count, r2, ZOLSHFT
+	lpnz	@.Lcopy32_64bytes
+	;; LOOP START
+	LOADX (r6, r1)
+	PREFETCH_READ (r1)
+	PREFETCH_WRITE (r3)
+	LOADX (r8, r1)
+	LOADX (r10, r1)
+	LOADX (r4, r1)
+	STOREX (r6, r3)
+	STOREX (r8, r3)
+	STOREX (r10, r3)
+	STOREX (r4, r3)
+.Lcopy32_64bytes:
+
+	and.f	lp_count, r2, ZOLAND ;Last remaining 31 bytes
+.Lsmallchunk:
+	lpnz	@.Lcopyremainingbytes
+	;; LOOP START
+	ldb.ab	r5, [r1,1]
+	stb.ab	r5, [r3,1]
+.Lcopyremainingbytes:
+
+	j	[blink]
+;;; END CASE 0
+
+.Lsourceunaligned:
+	cmp	r4, 2
+	beq.d	@.LunalignedOffby2
+	sub	r2, r2, 1
+
+	bhi.d	@.LunalignedOffby3
+	ldb.ab	r5, [r1, 1]
+
+;;; CASE 1: The source is unaligned, off by 1
+	;; Hence I need to read 1 byte for a 16bit alignment
+	;; and 2bytes to reach 32bit alignment
+	ldh.ab	r6, [r1, 2]
+	sub	r2, r2, 2
+	;; Convert to words, unfold x2
+	lsr.f	lp_count, r2, 3
+	MERGE_1 (r6, r6, 8)
+	MERGE_2 (r5, r5, 24)
+	or	r5, r5, r6
+
+	;; Both src and dst are aligned
+	lpnz	@.Lcopy8bytes_1
+	;; LOOP START
+	ld.ab	r6, [r1, 4]
+	prefetch [r1, 28]	;Prefetch the next read location
+	ld.ab	r8, [r1,4]
+	prefetchw [r3, 32]	;Prefetch the next write location
+
+	SHIFT_1	(r7, r6, 24)
+	or	r7, r7, r5
+	SHIFT_2	(r5, r6, 8)
+
+	SHIFT_1	(r9, r8, 24)
+	or	r9, r9, r5
+	SHIFT_2	(r5, r8, 8)
+
+	st.ab	r7, [r3, 4]
+	st.ab	r9, [r3, 4]
+.Lcopy8bytes_1:
+
+	;; Write back the remaining 16bits
+	EXTRACT_1 (r6, r5, 16)
+	sth.ab	r6, [r3, 2]
+	;; Write back the remaining 8bits
+	EXTRACT_2 (r5, r5, 16)
+	stb.ab	r5, [r3, 1]
+
+	and.f	lp_count, r2, 0x07 ;Last 8bytes
+	lpnz	@.Lcopybytewise_1
+	;; LOOP START
+	ldb.ab	r6, [r1,1]
+	stb.ab	r6, [r3,1]
+.Lcopybytewise_1:
+	j	[blink]
+
+.LunalignedOffby2:
+;;; CASE 2: The source is unaligned, off by 2
+	ldh.ab	r5, [r1, 2]
+	sub	r2, r2, 1
+
+	;; Both src and dst are aligned
+	;; Convert to words, unfold x2
+	lsr.f	lp_count, r2, 3
+#ifdef __BIG_ENDIAN__
+	asl.nz	r5, r5, 16
+#endif
+	lpnz	@.Lcopy8bytes_2
+	;; LOOP START
+	ld.ab	r6, [r1, 4]
+	prefetch [r1, 28]	;Prefetch the next read location
+	ld.ab	r8, [r1,4]
+	prefetchw [r3, 32]	;Prefetch the next write location
+
+	SHIFT_1	(r7, r6, 16)
+	or	r7, r7, r5
+	SHIFT_2	(r5, r6, 16)
+
+	SHIFT_1	(r9, r8, 16)
+	or	r9, r9, r5
+	SHIFT_2	(r5, r8, 16)
+
+	st.ab	r7, [r3, 4]
+	st.ab	r9, [r3, 4]
+.Lcopy8bytes_2:
+
+#ifdef __BIG_ENDIAN__
+	lsr.nz	r5, r5, 16
+#endif
+	sth.ab	r5, [r3, 2]
+
+	and.f	lp_count, r2, 0x07 ;Last 8bytes
+	lpnz	@.Lcopybytewise_2
+	;; LOOP START
+	ldb.ab	r6, [r1,1]
+	stb.ab	r6, [r3,1]
+.Lcopybytewise_2:
+	j	[blink]
+
+.LunalignedOffby3:
+;;; CASE 3: The source is unaligned, off by 3
+;;; Hence, I need to read 1byte for achieve the 32bit alignment
+
+	;; Both src and dst are aligned
+	;; Convert to words, unfold x2
+	lsr.f	lp_count, r2, 3
+#ifdef __BIG_ENDIAN__
+	asl.ne	r5, r5, 24
+#endif
+	lpnz	@.Lcopy8bytes_3
+	;; LOOP START
+	ld.ab	r6, [r1, 4]
+	prefetch [r1, 28]	;Prefetch the next read location
+	ld.ab	r8, [r1,4]
+	prefetchw [r3, 32]	;Prefetch the next write location
+
+	SHIFT_1	(r7, r6, 8)
+	or	r7, r7, r5
+	SHIFT_2	(r5, r6, 24)
+
+	SHIFT_1	(r9, r8, 8)
+	or	r9, r9, r5
+	SHIFT_2	(r5, r8, 24)
+
+	st.ab	r7, [r3, 4]
+	st.ab	r9, [r3, 4]
+.Lcopy8bytes_3:
+
+#ifdef __BIG_ENDIAN__
+	lsr.nz	r5, r5, 24
+#endif
+	stb.ab	r5, [r3, 1]
+
+	and.f	lp_count, r2, 0x07 ;Last 8bytes
+	lpnz	@.Lcopybytewise_3
+	;; LOOP START
+	ldb.ab	r6, [r1,1]
+	stb.ab	r6, [r3,1]
+.Lcopybytewise_3:
+	j	[blink]
+
+END(memcpy)
+libc_hidden_def(memcpy)
diff --git a/libc/string/arc/arcv2/memset.S b/libc/string/arc/arcv2/memset.S
new file mode 100644
index 000000000..d076ad1cd
--- /dev/null
+++ b/libc/string/arc/arcv2/memset.S
@@ -0,0 +1,85 @@
+
+/*
+ * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <features.h>
+#include <sysdep.h>
+
+#ifdef DONT_USE_PREALLOC
+#define PREWRITE(A,B)	prefetchw [(A),(B)]
+#else
+#define PREWRITE(A,B)	prealloc [(A),(B)]
+#endif
+
+ENTRY(memset)
+	prefetchw [r0]		; Prefetch the write location
+	mov.f	0, r2
+;;; if size is zero
+	jz.d	[blink]
+	mov	r3, r0		; don't clobber ret val
+
+;;; if length < 8
+	brls.d.nt	r2, 8, .Lsmallchunk
+	mov.f	lp_count,r2
+
+	and.f	r4, r0, 0x03
+	rsub	lp_count, r4, 4
+	lpnz	@.Laligndestination
+	;; LOOP BEGIN
+	stb.ab	r1, [r3,1]
+	sub	r2, r2, 1
+.Laligndestination:
+
+;;; Destination is aligned
+	and	r1, r1, 0xFF
+	asl	r4, r1, 8
+	or	r4, r4, r1
+	asl	r5, r4, 16
+	or	r5, r5, r4
+	mov	r4, r5
+
+	sub3	lp_count, r2, 8
+	cmp     r2, 64
+	bmsk.hi	r2, r2, 5
+	mov.ls	lp_count, 0
+	add3.hi	r2, r2, 8
+
+;;; Convert len to Dwords, unfold x8
+	lsr.f	lp_count, lp_count, 6
+	lpnz	@.Lset64bytes
+	;; LOOP START
+	PREWRITE(r3, 64)	;Prefetch the next write location
+	std.ab	r4, [r3, 8]
+	std.ab	r4, [r3, 8]
+	std.ab	r4, [r3, 8]
+	std.ab	r4, [r3, 8]
+	std.ab	r4, [r3, 8]
+	std.ab	r4, [r3, 8]
+	std.ab	r4, [r3, 8]
+	std.ab	r4, [r3, 8]
+.Lset64bytes:
+
+	lsr.f	lp_count, r2, 5 ;Last remaining  max 124 bytes
+	lpnz	.Lset32bytes
+	;; LOOP START
+	prefetchw [r3, 32]	;Prefetch the next write location
+	std.ab	r4, [r3, 8]
+	std.ab	r4, [r3, 8]
+	std.ab	r4, [r3, 8]
+	std.ab	r4, [r3, 8]
+.Lset32bytes:
+
+	and.f	lp_count, r2, 0x1F ;Last remaining 31 bytes
+.Lsmallchunk:
+	lpnz	.Lcopy3bytes
+	;; LOOP START
+	stb.ab	r1, [r3, 1]
+.Lcopy3bytes:
+
+	j	[blink]
+
+END(memset)
+libc_hidden_def(memset)
diff --git a/libc/string/arc/arcv2/strcmp.S b/libc/string/arc/arcv2/strcmp.S
new file mode 100644
index 000000000..2e0e64a0c
--- /dev/null
+++ b/libc/string/arc/arcv2/strcmp.S
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <features.h>
+#include <sysdep.h>
+
+ENTRY(strcmp)
+	or	r2, r0, r1
+	bmsk_s	r2, r2, 1
+	brne	r2, 0, @.Lcharloop
+
+;;; s1 and s2 are word aligned
+	ld.ab	r2, [r0, 4]
+
+	mov_s	r12, 0x01010101
+	ror	r11, r12
+	.align  4
+.LwordLoop:
+	ld.ab	r3, [r1, 4]
+	;; Detect NULL char in str1
+	sub	r4, r2, r12
+	ld.ab	r5, [r0, 4]
+	bic	r4, r4, r2
+	and	r4, r4, r11
+	brne.d.nt	r4, 0, .LfoundNULL
+	;; Check if the read locations are the same
+	cmp	r2, r3
+	beq.d	.LwordLoop
+	mov.eq	r2, r5
+
+	;; A match is found, spot it out
+#ifdef __LITTLE_ENDIAN__
+	swape	r3, r3
+	mov_s	r0, 1
+	swape	r2, r2
+#else
+	mov_s	r0, 1
+#endif
+	cmp_s	r2, r3
+	j_s.d	[blink]
+	bset.lo	r0, r0, 31
+
+	.align 4
+.LfoundNULL:
+#ifdef __BIG_ENDIAN__
+	swape	r4, r4
+	swape	r2, r2
+	swape	r3, r3
+#endif
+	;; Find null byte
+	ffs	r0, r4
+	bmsk	r2, r2, r0
+	bmsk	r3, r3, r0
+	swape	r2, r2
+	swape	r3, r3
+	;; make the return value
+	sub.f	r0, r2, r3
+	mov.hi	r0, 1
+	j_s.d	[blink]
+	bset.lo	r0, r0, 31
+
+	.align 4
+.Lcharloop:
+	ldb.ab	r2, [r0, 1]
+	ldb.ab	r3, [r1, 1]
+	nop
+	breq	r2, 0, .Lcmpend
+	breq	r2, r3, .Lcharloop
+
+	.align 4
+.Lcmpend:
+	j_s.d	[blink]
+	sub	r0, r2, r3
+END(strcmp)
+libc_hidden_def(strcmp)
+
+#ifndef __UCLIBC_HAS_LOCALE__
+strong_alias(strcmp,strcoll)
+libc_hidden_def(strcoll)
+#endif
diff --git a/libc/string/arc/memcmp.S b/libc/string/arc/memcmp.S
index 4c0e39143..a60757e7a 100644
--- a/libc/string/arc/memcmp.S
+++ b/libc/string/arc/memcmp.S
@@ -24,14 +24,32 @@ ENTRY(memcmp)
 	ld	r4,[r0,0]
 	ld	r5,[r1,0]
 	lsr.f	lp_count,r3,3
+#ifdef __HS__
+	/* In ARCv2 a branch can't be the last instruction in a zero overhead
+	 * loop.
+	 * So we move the branch to the start of the loop, duplicate it
+	 * after the end, and set up r12 so that the branch isn't taken
+	 *  initially.
+	 */
+	mov_s	r12,WORD2
+	lpne	.Loop_end
+	brne	WORD2,r12,.Lodd
+	ld	WORD2,[r0,4]
+#else
 	lpne	.Loop_end
 	ld_s	WORD2,[r0,4]
+#endif
 	ld_s	r12,[r1,4]
 	brne	r4,r5,.Leven
 	ld.a	r4,[r0,8]
 	ld.a	r5,[r1,8]
+#ifdef __HS__
+.Loop_end:
+	brne	WORD2,r12,.Lodd
+#else
 	brne	WORD2,r12,.Lodd
 .Loop_end:
+#endif
 	asl_s	SHIFT,SHIFT,3
 	bhs_s	.Last_cmp
 	brne	r4,r5,.Leven
@@ -99,14 +117,25 @@ ENTRY(memcmp)
 	ldb	r4,[r0,0]
 	ldb	r5,[r1,0]
 	lsr.f	lp_count,r3
+#ifdef __HS__
+	mov	r12,r3
 	lpne	.Lbyte_end
+	brne	r3,r12,.Lbyte_odd
+#else
+	lpne	.Lbyte_end
+#endif
 	ldb_s	r3,[r0,1]
 	ldb	r12,[r1,1]
 	brne	r4,r5,.Lbyte_even
 	ldb.a	r4,[r0,2]
 	ldb.a	r5,[r1,2]
+#ifdef __HS__
+.Lbyte_end:
+	brne	r3,r12,.Lbyte_odd
+#else
 	brne	r3,r12,.Lbyte_odd
 .Lbyte_end:
+#endif
 	bcc	.Lbyte_even
 	brne	r4,r5,.Lbyte_even
 	ldb_s	r3,[r0,1]
diff --git a/libc/sysdeps/linux/arc/bits/syscalls.h b/libc/sysdeps/linux/arc/bits/syscalls.h
index 5da6aadb3..248ef7844 100644
--- a/libc/sysdeps/linux/arc/bits/syscalls.h
+++ b/libc/sysdeps/linux/arc/bits/syscalls.h
@@ -98,7 +98,11 @@ extern int __syscall_error (int);
  * for syscall itself.
  *-------------------------------------------------------------------------*/
 
-#define ARC_TRAP_INSN  "trap0	\n\t"
+#ifdef __A7__
+#define ARC_TRAP_INSN	"trap0		\n\t"
+#elif defined(__HS__)
+#define ARC_TRAP_INSN	"trap_s 0	\n\t"
+#endif
 
 #define INTERNAL_SYSCALL_NCS(nm, err, nr_args, args...)	\
 ({							\
@@ -176,7 +180,11 @@ extern int __syscall_error (int);
 
 #else
 
+#ifdef __A7__
 #define ARC_TRAP_INSN	trap0
+#elif defined(__HS__)
+#define ARC_TRAP_INSN	trap_s 0
+#endif
 
 #endif /* __ASSEMBLER__ */
 
diff --git a/libc/sysdeps/linux/arc/bits/uClibc_arch_features.h b/libc/sysdeps/linux/arc/bits/uClibc_arch_features.h
index 8af6eca4c..451575586 100755
--- a/libc/sysdeps/linux/arc/bits/uClibc_arch_features.h
+++ b/libc/sysdeps/linux/arc/bits/uClibc_arch_features.h
@@ -47,4 +47,11 @@
 /* The default ';' is a comment on ARC. */
 #define __UCLIBC_ASM_LINE_SEP__ `
 
+/* does your target align 64bit values in register pairs ? (32bit arches only) */
+#if defined(__A7__)
+#undef __UCLIBC_SYSCALL_ALIGN_64BIT__
+#else
+#define __UCLIBC_SYSCALL_ALIGN_64BIT__
+#endif
+
 #endif /* _BITS_UCLIBC_ARCH_FEATURES_H */
diff --git a/libc/sysdeps/linux/common/Makefile.in b/libc/sysdeps/linux/common/Makefile.in
index 9d41771e2..8ee956b6b 100644
--- a/libc/sysdeps/linux/common/Makefile.in
+++ b/libc/sysdeps/linux/common/Makefile.in
@@ -45,6 +45,7 @@ CSRC-$(UCLIBC_LINUX_SPECIFIC) += \
 	sendfile.c \
 	setfsgid.c \
 	setfsuid.c \
+	setns.c \
 	setresgid.c \
 	setresuid.c \
 	signalfd.c \
diff --git a/libc/sysdeps/linux/common/bits/sched.h b/libc/sysdeps/linux/common/bits/sched.h
index a5eb6ee55..9d05314f5 100644
--- a/libc/sysdeps/linux/common/bits/sched.h
+++ b/libc/sysdeps/linux/common/bits/sched.h
@@ -1,7 +1,6 @@
 /* Definitions of constants and data structure for POSIX 1003.1b-1993
    scheduling interface.
-   Copyright (C) 1996-1999,2001-2003,2005,2006,2007,2008
-   Free Software Foundation, Inc.
+   Copyright (C) 1996-2015 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -26,14 +25,17 @@
 
 
 /* Scheduling algorithms.  */
-#define SCHED_OTHER	0
-#define SCHED_FIFO	1
-#define SCHED_RR	2
+#define SCHED_OTHER		0
+#define SCHED_FIFO		1
+#define SCHED_RR		2
 #ifdef __USE_GNU
-# define SCHED_BATCH	3
+# define SCHED_BATCH		3
+# define SCHED_IDLE		5
+
+# define SCHED_RESET_ON_FORK	0x40000000
 #endif
 
-#ifdef __USE_MISC
+#ifdef __USE_GNU
 /* Cloning flags.  */
 # define CSIGNAL       0x000000ff /* Signal mask to be sent at exit.  */
 # define CLONE_VM      0x00000100 /* Set if VM shared between processes.  */
@@ -58,7 +60,6 @@
 				      force CLONE_PTRACE on this clone.  */
 # define CLONE_CHILD_SETTID 0x01000000 /* Store TID in userlevel buffer in
 					  the child.  */
-# define CLONE_STOPPED 0x02000000 /* Start in stopped state.  */
 # define CLONE_NEWUTS	0x04000000	/* New utsname group.  */
 # define CLONE_NEWIPC	0x08000000	/* New ipcs.  */
 # define CLONE_NEWUSER	0x10000000	/* New user namespace.  */
@@ -75,7 +76,7 @@ struct sched_param
 
 __BEGIN_DECLS
 
-#ifdef __USE_MISC
+#ifdef __USE_GNU
 /* Clone current process.  */
 extern int clone (int (*__fn) (void *__arg), void *__child_stack,
 		  int __flags, void *__arg, ...) __THROW;
@@ -85,8 +86,12 @@ extern int unshare (int __flags) __THROW;
 
 /* Get index of currently used CPU.  */
 extern int sched_getcpu (void) __THROW;
+
+/* Switch process to namespace of type NSTYPE indicated by FD.  */
+extern int setns (int __fd, int __nstype) __THROW;
 #endif
 
+
 __END_DECLS
 
 #endif	/* need schedparam */
@@ -124,7 +129,11 @@ typedef struct
 } cpu_set_t;
 
 /* Access functions for CPU masks.  */
-# define __CPU_ZERO_S(setsize, cpusetp) \
+# if __GNUC_PREREQ (2, 91)
+#  define __CPU_ZERO_S(setsize, cpusetp) \
+  do __builtin_memset (cpusetp, '\0', setsize); while (0)
+# else
+#  define __CPU_ZERO_S(setsize, cpusetp) \
   do {									      \
     size_t __i;								      \
     size_t __imax = (setsize) / sizeof (__cpu_mask);			      \
@@ -132,47 +141,53 @@ typedef struct
     for (__i = 0; __i < __imax; ++__i)					      \
       __bits[__i] = 0;							      \
   } while (0)
+# endif
 # define __CPU_SET_S(cpu, setsize, cpusetp) \
   (__extension__							      \
    ({ size_t __cpu = (cpu);						      \
-      __cpu < 8 * (setsize)						      \
+      __cpu / 8 < (setsize)						      \
       ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]		      \
 	 |= __CPUMASK (__cpu))						      \
       : 0; }))
 # define __CPU_CLR_S(cpu, setsize, cpusetp) \
   (__extension__							      \
    ({ size_t __cpu = (cpu);						      \
-      __cpu < 8 * (setsize)						      \
+      __cpu / 8 < (setsize)						      \
       ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]		      \
 	 &= ~__CPUMASK (__cpu))						      \
       : 0; }))
 # define __CPU_ISSET_S(cpu, setsize, cpusetp) \
   (__extension__							      \
    ({ size_t __cpu = (cpu);						      \
-      __cpu < 8 * (setsize)						      \
-      ? ((((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]	      \
+      __cpu / 8 < (setsize)						      \
+      ? ((((const __cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]	      \
 	  & __CPUMASK (__cpu))) != 0					      \
       : 0; }))
 
 # define __CPU_COUNT_S(setsize, cpusetp) \
   __sched_cpucount (setsize, cpusetp)
 
-# define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
+# if __GNUC_PREREQ (2, 91)
+#  define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
+  (__builtin_memcmp (cpusetp1, cpusetp2, setsize) == 0)
+# else
+#  define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
   (__extension__							      \
-   ({ __cpu_mask *__arr1 = (cpusetp1)->__bits;				      \
-      __cpu_mask *__arr2 = (cpusetp2)->__bits;				      \
+   ({ const __cpu_mask *__arr1 = (cpusetp1)->__bits;			      \
+      const __cpu_mask *__arr2 = (cpusetp2)->__bits;			      \
       size_t __imax = (setsize) / sizeof (__cpu_mask);			      \
       size_t __i;							      \
       for (__i = 0; __i < __imax; ++__i)				      \
 	if (__arr1[__i] != __arr2[__i])					      \
 	  break;							      \
       __i == __imax; }))
+# endif
 
 # define __CPU_OP_S(setsize, destset, srcset1, srcset2, op) \
   (__extension__							      \
    ({ cpu_set_t *__dest = (destset);					      \
-      __cpu_mask *__arr1 = (srcset1)->__bits;				      \
-      __cpu_mask *__arr2 = (srcset2)->__bits;				      \
+      const __cpu_mask *__arr1 = (srcset1)->__bits;			      \
+      const __cpu_mask *__arr2 = (srcset2)->__bits;			      \
       size_t __imax = (setsize) / sizeof (__cpu_mask);			      \
       size_t __i;							      \
       for (__i = 0; __i < __imax; ++__i)				      \
diff --git a/libc/sysdeps/linux/common/eventfd.c b/libc/sysdeps/linux/common/eventfd.c
index 96597ab33..500b0c002 100644
--- a/libc/sysdeps/linux/common/eventfd.c
+++ b/libc/sysdeps/linux/common/eventfd.c
@@ -15,7 +15,7 @@
  * eventfd()
  */
 #if defined __NR_eventfd || defined __NR_eventfd2
-int eventfd (int count, int flags)
+int eventfd (unsigned int count, int flags)
 {
 #if defined __NR_eventfd2
   return INLINE_SYSCALL (eventfd2, 2, count, flags);
diff --git a/libc/sysdeps/linux/common/posix_fadvise.c b/libc/sysdeps/linux/common/posix_fadvise.c
index 14bbeeea1..74d8409c0 100644
--- a/libc/sysdeps/linux/common/posix_fadvise.c
+++ b/libc/sysdeps/linux/common/posix_fadvise.c
@@ -41,9 +41,17 @@ int posix_fadvise(int fd, off_t offset, off_t len, int advice)
 #  if __WORDSIZE == 64
 	ret = INTERNAL_SYSCALL(fadvise64_64, err, 4, fd, offset, len, advice);
 #  else
-#   if defined(__UCLIBC_SYSCALL_ALIGN_64BIT__) || defined(__arm__)
+#   if defined (__arm__) || \
+      (defined(__UCLIBC_SYSCALL_ALIGN_64BIT__) && (defined(__powerpc__) || defined(__xtensa__)))
+	/* arch with 64-bit data in even reg alignment #1: [powerpc/xtensa]
+	 * custom syscall handler (rearranges @advice to avoid register hole punch) */
 	ret = INTERNAL_SYSCALL(fadvise64_64, err, 6, fd, advice,
 			OFF_HI_LO (offset), OFF_HI_LO (len));
+#   elif defined(__UCLIBC_SYSCALL_ALIGN_64BIT__)
+	/* arch with 64-bit data in even reg alignment #2: [arcv2/others-in-future]
+	 * stock syscall handler in kernel (reg hole punched) */
+	ret = INTERNAL_SYSCALL(fadvise64_64, err, 7, fd, 0,
+			OFF_HI_LO (offset), OFF_HI_LO (len), advice);
 #   else
 	ret = INTERNAL_SYSCALL(fadvise64_64, err, 6, fd,
 			OFF_HI_LO (offset), OFF_HI_LO (len), advice);
diff --git a/libc/sysdeps/linux/common/posix_fadvise64.c b/libc/sysdeps/linux/common/posix_fadvise64.c
index 5d8989121..37fb269ca 100644
--- a/libc/sysdeps/linux/common/posix_fadvise64.c
+++ b/libc/sysdeps/linux/common/posix_fadvise64.c
@@ -24,9 +24,18 @@ int posix_fadvise64(int fd, off64_t offset, off64_t len, int advice)
 {
 	INTERNAL_SYSCALL_DECL (err);
 	/* ARM has always been funky. */
-# if defined(__UCLIBC_SYSCALL_ALIGN_64BIT__) || defined(__arm__)
+#if defined (__arm__) || \
+    (defined(__UCLIBC_SYSCALL_ALIGN_64BIT__) && (defined(__powerpc__) || defined(__xtensa__)))
+	/* arch with 64-bit data in even reg alignment #1: [powerpc/xtensa]
+	 * custom syscall handler (rearranges @advice to avoid register hole punch) */
 	int ret = INTERNAL_SYSCALL (fadvise64_64, err, 6, fd, advice,
 			OFF64_HI_LO (offset), OFF64_HI_LO (len));
+#elif defined(__UCLIBC_SYSCALL_ALIGN_64BIT__)
+	/* arch with 64-bit data in even reg alignment #2: [arcv2/others-in-future]
+	 * stock syscall handler in kernel (reg hole punched) */
+	int ret = INTERNAL_SYSCALL (fadvise64_64, err, 7, fd, 0,
+			OFF64_HI_LO (offset), OFF64_HI_LO (len),
+			advice);
 # else
 	int ret = INTERNAL_SYSCALL (fadvise64_64, err, 6, fd,
 			OFF64_HI_LO (offset), OFF64_HI_LO (len),
diff --git a/libc/sysdeps/linux/common/setns.c b/libc/sysdeps/linux/common/setns.c
new file mode 100644
index 000000000..a697720b9
--- /dev/null
+++ b/libc/sysdeps/linux/common/setns.c
@@ -0,0 +1,15 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * setns() for uClibc
+ *
+ * Copyright (C) 2015 Bernhard Reutner-Fischer <uclibc@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sys/syscall.h>
+#include <sched.h>
+
+#ifdef __NR_setns
+_syscall2(int, setns, int, fd, int, nstype)
+#endif
diff --git a/libc/sysdeps/linux/common/stubs.c b/libc/sysdeps/linux/common/stubs.c
index 57c4664aa..2c50307aa 100644
--- a/libc/sysdeps/linux/common/stubs.c
+++ b/libc/sysdeps/linux/common/stubs.c
@@ -346,6 +346,10 @@ make_stub(setfsgid)
 make_stub(setfsuid)
 #endif
 
+#if !defined __NR_setns && defined __UCLIBC_LINUX_SPECIFIC__
+make_stub(setns)
+#endif
+
 #if !defined __NR_setresgid32 && !defined __NR_setresgid && defined __UCLIBC_LINUX_SPECIFIC__
 make_stub(setresgid)
 #endif
diff --git a/libc/sysdeps/linux/common/sync_file_range.c b/libc/sysdeps/linux/common/sync_file_range.c
index 6cd7e94d6..db797de62 100644
--- a/libc/sysdeps/linux/common/sync_file_range.c
+++ b/libc/sysdeps/linux/common/sync_file_range.c
@@ -24,7 +24,11 @@ static int __NC(sync_file_range)(int fd, off64_t offset, off64_t nbytes, unsigne
 {
 #  if defined __powerpc__ && __WORDSIZE == 64
 	return INLINE_SYSCALL(sync_file_range, 4, fd, flags, offset, nbytes);
-#  elif defined __mips__ && _MIPS_SIM == _ABIO32
+#  elif (defined __mips__ && _MIPS_SIM == _ABIO32) || \
+	(defined(__UCLIBC_SYSCALL_ALIGN_64BIT__) && !(defined(__powerpc__) || defined(__xtensa__)))
+	/* arch with 64-bit data in even reg alignment #2: [arcv2/others-in-future]
+	 * stock syscall handler in kernel (reg hole punched)
+	 * see libc/sysdeps/linux/common/posix_fadvise.c for more details */
 	return INLINE_SYSCALL(sync_file_range, 7, fd, 0,
 			OFF64_HI_LO(offset), OFF64_HI_LO(nbytes), flags);
 #  elif defined __NR_sync_file_range2
diff --git a/libc/sysdeps/linux/common/sys/eventfd.h b/libc/sysdeps/linux/common/sys/eventfd.h
index 91b265b2c..a47b5fecf 100644
--- a/libc/sysdeps/linux/common/sys/eventfd.h
+++ b/libc/sysdeps/linux/common/sys/eventfd.h
@@ -31,7 +31,7 @@ __BEGIN_DECLS
 
 /* Return file descriptor for generic event channel.  Set initial
    value to COUNT.  */
-extern int eventfd (int __count, int __flags) __THROW;
+extern int eventfd (unsigned int __count, int __flags) __THROW;
 
 /* Read event counter and possibly wait for events.  */
 extern int eventfd_read (int __fd, eventfd_t *__value);
diff --git a/libc/sysdeps/linux/sparc/bits/eventfd.h b/libc/sysdeps/linux/sparc/bits/eventfd.h
index bed9f093b..e348cc6fb 100644
--- a/libc/sysdeps/linux/sparc/bits/eventfd.h
+++ b/libc/sysdeps/linux/sparc/bits/eventfd.h
@@ -22,7 +22,7 @@
 /* Flags for eventfd.  */
 enum
   {
-    EFD_SEMAPHORE = 1,
+    EFD_SEMAPHORE = 0x000001,
 #define EFD_SEMAPHORE EFD_SEMAPHORE
     EFD_CLOEXEC = 0x400000,
 #define EFD_CLOEXEC EFD_CLOEXEC