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

Pull ARM64 updates from Catalin Marinas:

 - Generic execve, kernel_thread, fork/vfork/clone.

 - Preparatory patches for KVM support (initialising EL2 mode for later
   installing KVM support, hypervisor stub).

 - Signal handling corner case fix (alternative signal stack set up for
   a SEGV handler, which is raised in response to RLIMIT_STACK being
   reached).

 - Sub-nanosecond timer error fix.

* tag 'arm64-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64: (30 commits)
  arm64: Update the MAINTAINERS entry
  arm64: compat for clock_adjtime(2) is miswired
  arm64: move FP-SIMD save/restore code to a macro
  arm64: hyp: initialize vttbr_el2 to zero
  arm64: add hypervisor stub
  arm64: record boot mode when entering the kernel
  arm64: move vector entry macro to assembler.h
  arm64: add AArch32 execution modes to ptrace.h
  arm64: expand register mapping between AArch32 and AArch64
  arm64: generic timer: use virtual counter instead of physical at EL0
  arm64: vdso: defer shifting of nanosecond component of timespec
  arm64: vdso: rework __do_get_tspec register allocation and return shift
  arm64: vdso: check sequence counter even for coarse realtime operations
  arm64: vdso: fix clocksource mask when extracting bottom 56 bits
  ARM64: Remove incorrect Kconfig symbol HAVE_SPARSE_IRQ
  Documentation: Fixes a word in Documentation/arm64/memory.txt
  arm64: Make !dirty ptes read-only
  arm64: Convert empty flush_cache_{mm,page} functions to static inline
  arm64: signal: let the compiler inline compat_get_sigframe
  arm64: signal: return struct rt_sigframe from get_sigframe
  ...

Conflicts:
	arch/arm64/include/asm/unistd32.h

12 files changed, 183 insertions, 26 deletions

diff --git a/arch/arm64/include/asm/Kbuild b/arch/arm64/include/asm/Kbuild
index 6e9ca462127..14a9d5a2b85 100644
--- a/arch/arm64/include/asm/Kbuild
+++ b/arch/arm64/include/asm/Kbuild
@@ -3,6 +3,7 @@
 generic-y += bug.h
 generic-y += bugs.h
 generic-y += checksum.h
+generic-y += clkdev.h
 generic-y += cputime.h
 generic-y += current.h
 generic-y += delay.h
diff --git a/arch/arm64/include/asm/arm_generic.h b/arch/arm64/include/asm/arm_generic.h
index e4cec9d30f2..df2aeb82f74 100644
--- a/arch/arm64/include/asm/arm_generic.h
+++ b/arch/arm64/include/asm/arm_generic.h
@@ -70,12 +70,12 @@ static inline void __cpuinit arch_counter_enable_user_access(void)
 {
 	u32 cntkctl;
 
-	/* Disable user access to the timers and the virtual counter. */
+	/* Disable user access to the timers and the physical counter. */
 	asm volatile("mrs	%0, cntkctl_el1" : "=r" (cntkctl));
-	cntkctl &= ~((3 << 8) | (1 << 1));
+	cntkctl &= ~((3 << 8) | (1 << 0));
 
-	/* Enable user access to the physical counter and frequency. */
-	cntkctl |= 1;
+	/* Enable user access to the virtual counter and frequency. */
+	cntkctl |= (1 << 1);
 	asm volatile("msr	cntkctl_el1, %0" : : "r" (cntkctl));
 }
 
diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
index da2a13e8f1e..c8eedc60498 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -107,3 +107,11 @@
  * Register aliases.
  */
 lr	.req	x30		// link register
+
+/*
+ * Vector entry
+ */
+	 .macro	ventry	label
+	.align	7
+	b	\label
+	.endm
diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h
index aa3132ab7f2..3300cbd18a8 100644
--- a/arch/arm64/include/asm/cacheflush.h
+++ b/arch/arm64/include/asm/cacheflush.h
@@ -70,13 +70,20 @@
  *		- size   - region size
  */
 extern void flush_cache_all(void);
-extern void flush_cache_mm(struct mm_struct *mm);
 extern void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end);
-extern void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn);
 extern void flush_icache_range(unsigned long start, unsigned long end);
 extern void __flush_dcache_area(void *addr, size_t len);
 extern void __flush_cache_user_range(unsigned long start, unsigned long end);
 
+static inline void flush_cache_mm(struct mm_struct *mm)
+{
+}
+
+static inline void flush_cache_page(struct vm_area_struct *vma,
+				    unsigned long user_addr, unsigned long pfn)
+{
+}
+
 /*
  * Copy user data from/to a page which is mapped into a different
  * processes address space.  Really, we want to allow our "user
diff --git a/arch/arm64/include/asm/fpsimdmacros.h b/arch/arm64/include/asm/fpsimdmacros.h
new file mode 100644
index 00000000000..bbec599c96b
--- /dev/null
+++ b/arch/arm64/include/asm/fpsimdmacros.h
@@ -0,0 +1,64 @@
+/*
+ * FP/SIMD state saving and restoring macros
+ *
+ * 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/>.
+ */
+
+.macro fpsimd_save state, tmpnr
+	stp	q0, q1, [\state, #16 * 0]
+	stp	q2, q3, [\state, #16 * 2]
+	stp	q4, q5, [\state, #16 * 4]
+	stp	q6, q7, [\state, #16 * 6]
+	stp	q8, q9, [\state, #16 * 8]
+	stp	q10, q11, [\state, #16 * 10]
+	stp	q12, q13, [\state, #16 * 12]
+	stp	q14, q15, [\state, #16 * 14]
+	stp	q16, q17, [\state, #16 * 16]
+	stp	q18, q19, [\state, #16 * 18]
+	stp	q20, q21, [\state, #16 * 20]
+	stp	q22, q23, [\state, #16 * 22]
+	stp	q24, q25, [\state, #16 * 24]
+	stp	q26, q27, [\state, #16 * 26]
+	stp	q28, q29, [\state, #16 * 28]
+	stp	q30, q31, [\state, #16 * 30]!
+	mrs	x\tmpnr, fpsr
+	str	w\tmpnr, [\state, #16 * 2]
+	mrs	x\tmpnr, fpcr
+	str	w\tmpnr, [\state, #16 * 2 + 4]
+.endm
+
+.macro fpsimd_restore state, tmpnr
+	ldp	q0, q1, [\state, #16 * 0]
+	ldp	q2, q3, [\state, #16 * 2]
+	ldp	q4, q5, [\state, #16 * 4]
+	ldp	q6, q7, [\state, #16 * 6]
+	ldp	q8, q9, [\state, #16 * 8]
+	ldp	q10, q11, [\state, #16 * 10]
+	ldp	q12, q13, [\state, #16 * 12]
+	ldp	q14, q15, [\state, #16 * 14]
+	ldp	q16, q17, [\state, #16 * 16]
+	ldp	q18, q19, [\state, #16 * 18]
+	ldp	q20, q21, [\state, #16 * 20]
+	ldp	q22, q23, [\state, #16 * 22]
+	ldp	q24, q25, [\state, #16 * 24]
+	ldp	q26, q27, [\state, #16 * 26]
+	ldp	q28, q29, [\state, #16 * 28]
+	ldp	q30, q31, [\state, #16 * 30]!
+	ldr	w\tmpnr, [\state, #16 * 2]
+	msr	fpsr, x\tmpnr
+	ldr	w\tmpnr, [\state, #16 * 2 + 4]
+	msr	fpcr, x\tmpnr
+.endm
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 14aba2db677..64b13394950 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -159,6 +159,8 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 {
 	if (pte_present_exec_user(pte))
 		__sync_icache_dcache(pte, addr);
+	if (!pte_dirty(pte))
+		pte = pte_wrprotect(pte);
 	set_pte(ptep, pte);
 }
 
diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h
index 77f696c1433..ab239b2c456 100644
--- a/arch/arm64/include/asm/processor.h
+++ b/arch/arm64/include/asm/processor.h
@@ -128,11 +128,6 @@ unsigned long get_wchan(struct task_struct *p);
 extern struct task_struct *cpu_switch_to(struct task_struct *prev,
 					 struct task_struct *next);
 
-/*
- * Create a new kernel thread
- */
-extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
-
 #define task_pt_regs(p) \
 	((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
 
diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h
index b04d3404f0d..4ce845f8ee1 100644
--- a/arch/arm64/include/asm/ptrace.h
+++ b/arch/arm64/include/asm/ptrace.h
@@ -30,7 +30,17 @@
 #define COMPAT_PTRACE_SETVFPREGS	28
 #define COMPAT_PTRACE_GETHBPREGS	29
 #define COMPAT_PTRACE_SETHBPREGS	30
+
+/* AArch32 CPSR bits */
+#define COMPAT_PSR_MODE_MASK	0x0000001f
 #define COMPAT_PSR_MODE_USR	0x00000010
+#define COMPAT_PSR_MODE_FIQ	0x00000011
+#define COMPAT_PSR_MODE_IRQ	0x00000012
+#define COMPAT_PSR_MODE_SVC	0x00000013
+#define COMPAT_PSR_MODE_ABT	0x00000017
+#define COMPAT_PSR_MODE_HYP	0x0000001a
+#define COMPAT_PSR_MODE_UND	0x0000001b
+#define COMPAT_PSR_MODE_SYS	0x0000001f
 #define COMPAT_PSR_T_BIT	0x00000020
 #define COMPAT_PSR_IT_MASK	0x0600fc00	/* If-Then execution state mask */
 /*
@@ -44,10 +54,27 @@
 
 /* sizeof(struct user) for AArch32 */
 #define COMPAT_USER_SZ	296
-/* AArch32 uses x13 as the stack pointer... */
+
+/* Architecturally defined mapping between AArch32 and AArch64 registers */
+#define compat_usr(x)	regs[(x)]
 #define compat_sp	regs[13]
-/* ... and x14 as the link register. */
 #define compat_lr	regs[14]
+#define compat_sp_hyp	regs[15]
+#define compat_sp_irq	regs[16]
+#define compat_lr_irq	regs[17]
+#define compat_sp_svc	regs[18]
+#define compat_lr_svc	regs[19]
+#define compat_sp_abt	regs[20]
+#define compat_lr_abt	regs[21]
+#define compat_sp_und	regs[22]
+#define compat_lr_und	regs[23]
+#define compat_r8_fiq	regs[24]
+#define compat_r9_fiq	regs[25]
+#define compat_r10_fiq	regs[26]
+#define compat_r11_fiq	regs[27]
+#define compat_r12_fiq	regs[28]
+#define compat_sp_fiq	regs[29]
+#define compat_lr_fiq	regs[30]
 
 /*
  * This struct defines the way the registers are stored on the stack during an
diff --git a/arch/arm64/include/asm/syscalls.h b/arch/arm64/include/asm/syscalls.h
index 09ff33572aa..a1b00cd6f78 100644
--- a/arch/arm64/include/asm/syscalls.h
+++ b/arch/arm64/include/asm/syscalls.h
@@ -23,18 +23,16 @@
 /*
  * System call wrappers implemented in kernel/entry.S.
  */
-asmlinkage long sys_execve_wrapper(const char __user *filename,
-				   const char __user *const __user *argv,
-				   const char __user *const __user *envp);
-asmlinkage long sys_clone_wrapper(unsigned long clone_flags,
-				  unsigned long newsp,
-				  void __user *parent_tid,
-				  unsigned long tls_val,
-				  void __user *child_tid);
 asmlinkage long sys_rt_sigreturn_wrapper(void);
 asmlinkage long sys_sigaltstack_wrapper(const stack_t __user *uss,
 					stack_t __user *uoss);
 
+/*
+ * AArch64 sys_clone implementation has a different prototype than the generic
+ * one (additional TLS value argument).
+ */
+#define sys_clone	sys_clone
+
 #include <asm-generic/syscalls.h>
 
 #endif	/* __ASM_SYSCALLS_H */
diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h
index 68aff2816e8..43064a8bd99 100644
--- a/arch/arm64/include/asm/unistd.h
+++ b/arch/arm64/include/asm/unistd.h
@@ -25,4 +25,5 @@
 #define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
 #define __ARCH_WANT_COMPAT_SYS_SENDFILE
 #endif
+#define __ARCH_WANT_SYS_EXECVE
 #include <uapi/asm/unistd.h>
diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h
index 656a6f291a3..50104e8ce55 100644
--- a/arch/arm64/include/asm/unistd32.h
+++ b/arch/arm64/include/asm/unistd32.h
@@ -23,7 +23,7 @@
 
 __SYSCALL(0,   sys_restart_syscall)
 __SYSCALL(1,   sys_exit)
-__SYSCALL(2,   compat_sys_fork_wrapper)
+__SYSCALL(2,   compat_sys_fork)
 __SYSCALL(3,   sys_read)
 __SYSCALL(4,   sys_write)
 __SYSCALL(5,   compat_sys_open)
@@ -32,7 +32,7 @@ __SYSCALL(7,   sys_ni_syscall)			/* 7 was sys_waitpid */
 __SYSCALL(8,   sys_creat)
 __SYSCALL(9,   sys_link)
 __SYSCALL(10,  sys_unlink)
-__SYSCALL(11,  compat_sys_execve_wrapper)
+__SYSCALL(11,  compat_sys_execve)
 __SYSCALL(12,  sys_chdir)
 __SYSCALL(13,  sys_ni_syscall)			/* 13 was sys_time */
 __SYSCALL(14,  sys_mknod)
@@ -141,7 +141,7 @@ __SYSCALL(116, compat_sys_sysinfo)
 __SYSCALL(117, sys_ni_syscall)			/* 117 was sys_ipc */
 __SYSCALL(118, sys_fsync)
 __SYSCALL(119, compat_sys_sigreturn_wrapper)
-__SYSCALL(120, compat_sys_clone_wrapper)
+__SYSCALL(120, sys_clone)
 __SYSCALL(121, sys_setdomainname)
 __SYSCALL(122, sys_newuname)
 __SYSCALL(123, sys_ni_syscall)			/* 123 was sys_modify_ldt */
@@ -211,7 +211,7 @@ __SYSCALL(186, compat_sys_sigaltstack_wrapper)
 __SYSCALL(187, compat_sys_sendfile)
 __SYSCALL(188, sys_ni_syscall)			/* 188 reserved */
 __SYSCALL(189, sys_ni_syscall)			/* 189 reserved */
-__SYSCALL(190, compat_sys_vfork_wrapper)
+__SYSCALL(190, compat_sys_vfork)
 __SYSCALL(191, compat_sys_getrlimit)		/* SuS compliant getrlimit */
 __SYSCALL(192, sys_mmap_pgoff)
 __SYSCALL(193, compat_sys_truncate64_wrapper)
@@ -393,7 +393,7 @@ __SYSCALL(368, compat_sys_fanotify_mark_wrapper)
 __SYSCALL(369, sys_prlimit64)
 __SYSCALL(370, sys_name_to_handle_at)
 __SYSCALL(371, compat_sys_open_by_handle_at)
-__SYSCALL(372, sys_clock_adjtime)
+__SYSCALL(372, compat_sys_clock_adjtime)
 __SYSCALL(373, sys_syncfs)
 
 #define __NR_compat_syscalls		374
diff --git a/arch/arm64/include/asm/virt.h b/arch/arm64/include/asm/virt.h
new file mode 100644
index 00000000000..439827271e3
--- /dev/null
+++ b/arch/arm64/include/asm/virt.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Marc Zyngier <marc.zyngier@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/>.
+ */
+
+#ifndef __ASM__VIRT_H
+#define __ASM__VIRT_H
+
+#define BOOT_CPU_MODE_EL2	(0x0e12b007)
+
+#ifndef __ASSEMBLY__
+
+/*
+ * __boot_cpu_mode records what mode CPUs were booted in.
+ * A correctly-implemented bootloader must start all CPUs in the same mode:
+ * In this case, both 32bit halves of __boot_cpu_mode will contain the
+ * same value (either 0 if booted in EL1, BOOT_CPU_MODE_EL2 if booted in EL2).
+ *
+ * Should the bootloader fail to do this, the two values will be different.
+ * This allows the kernel to flag an error when the secondaries have come up.
+ */
+extern u32 __boot_cpu_mode[2];
+
+void __hyp_set_vectors(phys_addr_t phys_vector_base);
+phys_addr_t __hyp_get_vectors(void);
+
+/* Reports the availability of HYP mode */
+static inline bool is_hyp_mode_available(void)
+{
+	return (__boot_cpu_mode[0] == BOOT_CPU_MODE_EL2 &&
+		__boot_cpu_mode[1] == BOOT_CPU_MODE_EL2);
+}
+
+/* Check if the bootloader has booted CPUs in different modes */
+static inline bool is_hyp_mode_mismatched(void)
+{
+	return __boot_cpu_mode[0] != __boot_cpu_mode[1];
+}
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* ! __ASM__VIRT_H */