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, 138 insertions, 0 deletions

diff --git a/arch/arm64/kernel/sys.c b/arch/arm64/kernel/sys.c
new file mode 100644
index 000000000000..905fcfb0ddd0
--- /dev/null
+++ b/arch/arm64/kernel/sys.c
@@ -0,0 +1,138 @@
+/*
+ * AArch64-specific system calls implementation
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Catalin Marinas <catalin.marinas@arm.com>
+ *
+ * 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/compiler.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/export.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/syscalls.h>
+
+/*
+ * Clone a task - this clones the calling program thread.
+ */
+asmlinkage long sys_clone(unsigned long clone_flags, unsigned long newsp,
+                          int __user *parent_tidptr, unsigned long tls_val,
+                          int __user *child_tidptr, struct pt_regs *regs)
+{
+        if (!newsp)
+                newsp = regs->sp;
+        /* 16-byte aligned stack mandatory on AArch64 */
+        if (newsp & 15)
+                return -EINVAL;
+        return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
+}
+
+/*
+ * sys_execve() executes a new program.
+ */
+asmlinkage long sys_execve(const char __user *filenamei,
+                           const char __user *const __user *argv,
+                           const char __user *const __user *envp,
+                           struct pt_regs *regs)
+{
+        long error;
+        char * filename;
+
+        filename = getname(filenamei);
+        error = PTR_ERR(filename);
+        if (IS_ERR(filename))
+                goto out;
+        error = do_execve(filename, argv, envp, regs);
+        putname(filename);
+out:
+        return error;
+}
+
+int kernel_execve(const char *filename,
+                  const char *const argv[],
+                  const char *const envp[])
+{
+        struct pt_regs regs;
+        int ret;
+
+        memset(&regs, 0, sizeof(struct pt_regs));
+        ret = do_execve(filename,
+                        (const char __user *const __user *)argv,
+                        (const char __user *const __user *)envp, &regs);
+        if (ret < 0)
+                goto out;
+
+        /*
+         * Save argc to the register structure for userspace.
+         */
+        regs.regs[0] = ret;
+
+        /*
+         * We were successful.  We won't be returning to our caller, but
+         * instead to user space by manipulating the kernel stack.
+         */
+        asm(    "add    x0, %0, %1\n\t"
+                "mov    x1, %2\n\t"
+                "mov    x2, %3\n\t"
+                "bl     memmove\n\t"    /* copy regs to top of stack */
+                "mov    x27, #0\n\t"    /* not a syscall */
+                "mov    x28, %0\n\t"    /* thread structure */
+                "mov    sp, x0\n\t"     /* reposition stack pointer */
+                "b      ret_to_user"
+                :
+                : "r" (current_thread_info()),
+                  "Ir" (THREAD_START_SP - sizeof(regs)),
+                  "r" (&regs),
+                  "Ir" (sizeof(regs))
+                : "x0", "x1", "x2", "x27", "x28", "x30", "memory");
+
+ out:
+        return ret;
+}
+EXPORT_SYMBOL(kernel_execve);
+
+asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
+                         unsigned long prot, unsigned long flags,
+                         unsigned long fd, off_t off)
+{
+        if (offset_in_page(off) != 0)
+                return -EINVAL;
+
+        return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
+}
+
+/*
+ * Wrappers to pass the pt_regs argument.
+ */
+#define sys_execve              sys_execve_wrapper
+#define sys_clone               sys_clone_wrapper
+#define sys_rt_sigreturn        sys_rt_sigreturn_wrapper
+#define sys_sigaltstack         sys_sigaltstack_wrapper
+
+#include <asm/syscalls.h>
+
+#undef __SYSCALL
+#define __SYSCALL(nr, sym)      [nr] = sym,
+
+/*
+ * The sys_call_table array must be 4K aligned to be accessible from
+ * kernel/entry.S.
+ */
+void *sys_call_table[__NR_syscalls] __aligned(4096) = {
+        [0 ... __NR_syscalls - 1] = sys_ni_syscall,
+#include <asm/unistd.h>
+};