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authorRussell King <rmk+kernel@arm.linux.org.uk>2012-05-21 15:15:24 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-05-21 15:15:24 +0100
commit4175160b065e74572819a320dcd34129224a4e1c (patch)
tree3298e2c9a7c7db33bf28617875e5429e17eec61c /arch/arm/include/asm
parentddf90a2ff2c4a9da99acc898a4afeab3e4251fcd (diff)
parent0ec8e7aa8f63f0cacd545fcd7f40f93fde2c0e6e (diff)
Merge branch 'misc' into for-linus
Conflicts: arch/arm/kernel/ptrace.c
Diffstat (limited to 'arch/arm/include/asm')
-rw-r--r--arch/arm/include/asm/cacheflush.h6
-rw-r--r--arch/arm/include/asm/cmpxchg.h73
-rw-r--r--arch/arm/include/asm/mach/time.h5
-rw-r--r--arch/arm/include/asm/pgtable-3level.h2
-rw-r--r--arch/arm/include/asm/ptrace.h5
-rw-r--r--arch/arm/include/asm/syscall.h93
6 files changed, 119 insertions, 65 deletions
diff --git a/arch/arm/include/asm/cacheflush.h b/arch/arm/include/asm/cacheflush.h
index d5d8d5c7268..004c1bc95d2 100644
--- a/arch/arm/include/asm/cacheflush.h
+++ b/arch/arm/include/asm/cacheflush.h
@@ -101,7 +101,7 @@ struct cpu_cache_fns {
void (*flush_user_range)(unsigned long, unsigned long, unsigned int);
void (*coherent_kern_range)(unsigned long, unsigned long);
- void (*coherent_user_range)(unsigned long, unsigned long);
+ int (*coherent_user_range)(unsigned long, unsigned long);
void (*flush_kern_dcache_area)(void *, size_t);
void (*dma_map_area)(const void *, size_t, int);
@@ -142,7 +142,7 @@ extern void __cpuc_flush_kern_all(void);
extern void __cpuc_flush_user_all(void);
extern void __cpuc_flush_user_range(unsigned long, unsigned long, unsigned int);
extern void __cpuc_coherent_kern_range(unsigned long, unsigned long);
-extern void __cpuc_coherent_user_range(unsigned long, unsigned long);
+extern int __cpuc_coherent_user_range(unsigned long, unsigned long);
extern void __cpuc_flush_dcache_area(void *, size_t);
/*
@@ -249,7 +249,7 @@ extern void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr
* Harvard caches are synchronised for the user space address range.
* This is used for the ARM private sys_cacheflush system call.
*/
-#define flush_cache_user_range(vma,start,end) \
+#define flush_cache_user_range(start,end) \
__cpuc_coherent_user_range((start) & PAGE_MASK, PAGE_ALIGN(end))
/*
diff --git a/arch/arm/include/asm/cmpxchg.h b/arch/arm/include/asm/cmpxchg.h
index d41d7cbf0ad..7eb18c1d8d6 100644
--- a/arch/arm/include/asm/cmpxchg.h
+++ b/arch/arm/include/asm/cmpxchg.h
@@ -229,66 +229,19 @@ static inline unsigned long __cmpxchg_local(volatile void *ptr,
(unsigned long)(n), \
sizeof(*(ptr))))
-#ifndef CONFIG_CPU_V6 /* min ARCH >= ARMv6K */
-
-/*
- * Note : ARMv7-M (currently unsupported by Linux) does not support
- * ldrexd/strexd. If ARMv7-M is ever supported by the Linux kernel, it should
- * not be allowed to use __cmpxchg64.
- */
-static inline unsigned long long __cmpxchg64(volatile void *ptr,
- unsigned long long old,
- unsigned long long new)
-{
- register unsigned long long oldval asm("r0");
- register unsigned long long __old asm("r2") = old;
- register unsigned long long __new asm("r4") = new;
- unsigned long res;
-
- do {
- asm volatile(
- " @ __cmpxchg8\n"
- " ldrexd %1, %H1, [%2]\n"
- " mov %0, #0\n"
- " teq %1, %3\n"
- " teqeq %H1, %H3\n"
- " strexdeq %0, %4, %H4, [%2]\n"
- : "=&r" (res), "=&r" (oldval)
- : "r" (ptr), "Ir" (__old), "r" (__new)
- : "memory", "cc");
- } while (res);
-
- return oldval;
-}
-
-static inline unsigned long long __cmpxchg64_mb(volatile void *ptr,
- unsigned long long old,
- unsigned long long new)
-{
- unsigned long long ret;
-
- smp_mb();
- ret = __cmpxchg64(ptr, old, new);
- smp_mb();
-
- return ret;
-}
-
-#define cmpxchg64(ptr,o,n) \
- ((__typeof__(*(ptr)))__cmpxchg64_mb((ptr), \
- (unsigned long long)(o), \
- (unsigned long long)(n)))
-
-#define cmpxchg64_local(ptr,o,n) \
- ((__typeof__(*(ptr)))__cmpxchg64((ptr), \
- (unsigned long long)(o), \
- (unsigned long long)(n)))
-
-#else /* min ARCH = ARMv6 */
-
-#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
-
-#endif
+#define cmpxchg64(ptr, o, n) \
+ ((__typeof__(*(ptr)))atomic64_cmpxchg(container_of((ptr), \
+ atomic64_t, \
+ counter), \
+ (unsigned long)(o), \
+ (unsigned long)(n)))
+
+#define cmpxchg64_local(ptr, o, n) \
+ ((__typeof__(*(ptr)))local64_cmpxchg(container_of((ptr), \
+ local64_t, \
+ a), \
+ (unsigned long)(o), \
+ (unsigned long)(n)))
#endif /* __LINUX_ARM_ARCH__ >= 6 */
diff --git a/arch/arm/include/asm/mach/time.h b/arch/arm/include/asm/mach/time.h
index f73c908b7fa..6ca945f534a 100644
--- a/arch/arm/include/asm/mach/time.h
+++ b/arch/arm/include/asm/mach/time.h
@@ -42,4 +42,9 @@ struct sys_timer {
extern void timer_tick(void);
+struct timespec;
+typedef void (*clock_access_fn)(struct timespec *);
+extern int register_persistent_clock(clock_access_fn read_boot,
+ clock_access_fn read_persistent);
+
#endif
diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h
index 759af70f9a0..b24903549d1 100644
--- a/arch/arm/include/asm/pgtable-3level.h
+++ b/arch/arm/include/asm/pgtable-3level.h
@@ -69,8 +69,6 @@
*/
#define L_PTE_PRESENT (_AT(pteval_t, 3) << 0) /* Valid */
#define L_PTE_FILE (_AT(pteval_t, 1) << 2) /* only when !PRESENT */
-#define L_PTE_BUFFERABLE (_AT(pteval_t, 1) << 2) /* AttrIndx[0] */
-#define L_PTE_CACHEABLE (_AT(pteval_t, 1) << 3) /* AttrIndx[1] */
#define L_PTE_USER (_AT(pteval_t, 1) << 6) /* AP[1] */
#define L_PTE_RDONLY (_AT(pteval_t, 1) << 7) /* AP[2] */
#define L_PTE_SHARED (_AT(pteval_t, 3) << 8) /* SH[1:0], inner shareable */
diff --git a/arch/arm/include/asm/ptrace.h b/arch/arm/include/asm/ptrace.h
index 451808ba121..355ece523f4 100644
--- a/arch/arm/include/asm/ptrace.h
+++ b/arch/arm/include/asm/ptrace.h
@@ -249,6 +249,11 @@ static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
return regs->ARM_sp;
}
+static inline unsigned long user_stack_pointer(struct pt_regs *regs)
+{
+ return regs->ARM_sp;
+}
+
#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */
diff --git a/arch/arm/include/asm/syscall.h b/arch/arm/include/asm/syscall.h
new file mode 100644
index 00000000000..c334a23ddf7
--- /dev/null
+++ b/arch/arm/include/asm/syscall.h
@@ -0,0 +1,93 @@
+/*
+ * Access to user system call parameters and results
+ *
+ * See asm-generic/syscall.h for descriptions of what we must do here.
+ */
+
+#ifndef _ASM_ARM_SYSCALL_H
+#define _ASM_ARM_SYSCALL_H
+
+#include <linux/err.h>
+
+extern const unsigned long sys_call_table[];
+
+static inline int syscall_get_nr(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ return task_thread_info(task)->syscall;
+}
+
+static inline void syscall_rollback(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ regs->ARM_r0 = regs->ARM_ORIG_r0;
+}
+
+static inline long syscall_get_error(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ unsigned long error = regs->ARM_r0;
+ return IS_ERR_VALUE(error) ? error : 0;
+}
+
+static inline long syscall_get_return_value(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ return regs->ARM_r0;
+}
+
+static inline void syscall_set_return_value(struct task_struct *task,
+ struct pt_regs *regs,
+ int error, long val)
+{
+ regs->ARM_r0 = (long) error ? error : val;
+}
+
+#define SYSCALL_MAX_ARGS 7
+
+static inline void syscall_get_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ unsigned int i, unsigned int n,
+ unsigned long *args)
+{
+ if (i + n > SYSCALL_MAX_ARGS) {
+ unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
+ unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
+ pr_warning("%s called with max args %d, handling only %d\n",
+ __func__, i + n, SYSCALL_MAX_ARGS);
+ memset(args_bad, 0, n_bad * sizeof(args[0]));
+ n = SYSCALL_MAX_ARGS - i;
+ }
+
+ if (i == 0) {
+ args[0] = regs->ARM_ORIG_r0;
+ args++;
+ i++;
+ n--;
+ }
+
+ memcpy(args, &regs->ARM_r0 + i, n * sizeof(args[0]));
+}
+
+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ unsigned int i, unsigned int n,
+ const unsigned long *args)
+{
+ if (i + n > SYSCALL_MAX_ARGS) {
+ pr_warning("%s called with max args %d, handling only %d\n",
+ __func__, i + n, SYSCALL_MAX_ARGS);
+ n = SYSCALL_MAX_ARGS - i;
+ }
+
+ if (i == 0) {
+ regs->ARM_ORIG_r0 = args[0];
+ args++;
+ i++;
+ n--;
+ }
+
+ memcpy(&regs->ARM_r0 + i, args, n * sizeof(args[0]));
+}
+
+#endif /* _ASM_ARM_SYSCALL_H */