Merge tag 'arm64-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64

Pull arm64 support from Catalin Marinas:
 "Linux support for the 64-bit ARM architecture (AArch64)

  Features currently supported:
   - 39-bit address space for user and kernel (each)
   - 4KB and 64KB page configurations
   - Compat (32-bit) user applications (ARMv7, EABI only)
   - Flattened Device Tree (mandated for all AArch64 platforms)
   - ARM generic timers"

* tag 'arm64-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64: (35 commits)
  arm64: ptrace: remove obsolete ptrace request numbers from user headers
  arm64: Do not set the SMP/nAMP processor bit
  arm64: MAINTAINERS update
  arm64: Build infrastructure
  arm64: Miscellaneous header files
  arm64: Generic timers support
  arm64: Loadable modules
  arm64: Miscellaneous library functions
  arm64: Performance counters support
  arm64: Add support for /proc/sys/debug/exception-trace
  arm64: Debugging support
  arm64: Floating point and SIMD
  arm64: 32-bit (compat) applications support
  arm64: User access library functions
  arm64: Signal handling support
  arm64: VDSO support
  arm64: System calls handling
  arm64: ELF definitions
  arm64: SMP support
  arm64: DMA mapping API
  ...

1 files changed, 63 insertions, 0 deletions

diff --git a/arch/arm64/lib/copy_in_user.S b/arch/arm64/lib/copy_in_user.S
new file mode 100644
index 000000000000..84b6c9bb9b93
--- /dev/null
+++ b/arch/arm64/lib/copy_in_user.S
@@ -0,0 +1,63 @@
+/*
+ * Copy from user space to user space
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+/*
+ * Copy from user space to user space (alignment handled by the hardware)
+ *
+ * Parameters:
+ *	x0 - to
+ *	x1 - from
+ *	x2 - n
+ * Returns:
+ *	x0 - bytes not copied
+ */
+ENTRY(__copy_in_user)
+	add	x4, x0, x2			// upper user buffer boundary
+	subs	x2, x2, #8
+	b.mi	2f
+1:
+USER(9f, ldr	x3, [x1], #8	)
+	subs	x2, x2, #8
+USER(9f, str	x3, [x0], #8	)
+	b.pl	1b
+2:	adds	x2, x2, #4
+	b.mi	3f
+USER(9f, ldr	w3, [x1], #4	)
+	sub	x2, x2, #4
+USER(9f, str	w3, [x0], #4	)
+3:	adds	x2, x2, #2
+	b.mi	4f
+USER(9f, ldrh	w3, [x1], #2	)
+	sub	x2, x2, #2
+USER(9f, strh	w3, [x0], #2	)
+4:	adds	x2, x2, #1
+	b.mi	5f
+USER(9f, ldrb	w3, [x1]	)
+USER(9f, strb	w3, [x0]	)
+5:	mov	x0, #0
+	ret
+ENDPROC(__copy_in_user)
+
+	.section .fixup,"ax"
+	.align	2
+9:	sub	x0, x4, x0			// bytes not copied
+	ret
+	.previous