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authorLinus Torvalds <torvalds@g5.osdl.org>2005-12-19 16:43:13 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-12-19 16:43:13 -0800
commitd898d485e721db45be555c27df5de03281f2fd05 (patch)
tree2da2fb89a2dd309ef2fd2c651ca87027134c4073 /arch
parentdf7addbb45874f0f992266003155de5a22e1872f (diff)
parent7c612bfd4ed3064fd48a4877a114c8186547367b (diff)
Merge master.kernel.org:/home/rmk/linux-2.6-arm
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/kernel/calls.S8
-rw-r--r--arch/arm/kernel/entry-armv.S49
-rw-r--r--arch/arm/kernel/entry-common.S20
3 files changed, 55 insertions, 22 deletions
diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
index 2ad4aa2a1536..55076a75e5bf 100644
--- a/arch/arm/kernel/calls.S
+++ b/arch/arm/kernel/calls.S
@@ -131,7 +131,7 @@ __syscall_start:
.long sys_wait4
/* 115 */ .long sys_swapoff
.long sys_sysinfo
- .long sys_ipc_wrapper
+ .long sys_ipc
.long sys_fsync
.long sys_sigreturn_wrapper
/* 120 */ .long sys_clone_wrapper
@@ -254,7 +254,7 @@ __syscall_start:
.long sys_fremovexattr
.long sys_tkill
.long sys_sendfile64
-/* 240 */ .long sys_futex_wrapper
+/* 240 */ .long sys_futex
.long sys_sched_setaffinity
.long sys_sched_getaffinity
.long sys_io_setup
@@ -284,7 +284,7 @@ __syscall_start:
.long sys_fstatfs64
.long sys_tgkill
.long sys_utimes
-/* 270 */ .long sys_arm_fadvise64_64_wrapper
+/* 270 */ .long sys_arm_fadvise64_64
.long sys_pciconfig_iobase
.long sys_pciconfig_read
.long sys_pciconfig_write
@@ -333,7 +333,7 @@ __syscall_start:
.long sys_inotify_init
.long sys_inotify_add_watch
.long sys_inotify_rm_watch
- .long sys_mbind_wrapper
+ .long sys_mbind
/* 320 */ .long sys_get_mempolicy
.long sys_set_mempolicy
__syscall_end:
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index d9fb819bf7cc..2a8d27e18fa7 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -614,6 +614,47 @@ __kuser_helper_start:
/*
* Reference prototype:
*
+ * void __kernel_memory_barrier(void)
+ *
+ * Input:
+ *
+ * lr = return address
+ *
+ * Output:
+ *
+ * none
+ *
+ * Clobbered:
+ *
+ * the Z flag might be lost
+ *
+ * Definition and user space usage example:
+ *
+ * typedef void (__kernel_dmb_t)(void);
+ * #define __kernel_dmb (*(__kernel_dmb_t *)0xffff0fa0)
+ *
+ * Apply any needed memory barrier to preserve consistency with data modified
+ * manually and __kuser_cmpxchg usage.
+ *
+ * This could be used as follows:
+ *
+ * #define __kernel_dmb() \
+ * asm volatile ( "mov r0, #0xffff0fff; mov lr, pc; sub pc, r0, #95" \
+ * : : : "lr","cc" )
+ */
+
+__kuser_memory_barrier: @ 0xffff0fa0
+
+#if __LINUX_ARM_ARCH__ >= 6 && defined(CONFIG_SMP)
+ mcr p15, 0, r0, c7, c10, 5 @ dmb
+#endif
+ mov pc, lr
+
+ .align 5
+
+/*
+ * Reference prototype:
+ *
* int __kernel_cmpxchg(int oldval, int newval, int *ptr)
*
* Input:
@@ -642,6 +683,8 @@ __kuser_helper_start:
* The C flag is also set if *ptr was changed to allow for assembly
* optimization in the calling code.
*
+ * Note: this routine already includes memory barriers as needed.
+ *
* For example, a user space atomic_add implementation could look like this:
*
* #define atomic_add(ptr, val) \
@@ -698,10 +741,16 @@ __kuser_cmpxchg: @ 0xffff0fc0
#else
+#ifdef CONFIG_SMP
+ mcr p15, 0, r0, c7, c10, 5 @ dmb
+#endif
ldrex r3, [r2]
subs r3, r3, r0
strexeq r3, r1, [r2]
rsbs r0, r3, #0
+#ifdef CONFIG_SMP
+ mcr p15, 0, r0, c7, c10, 5 @ dmb
+#endif
mov pc, lr
#endif
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index f7f183075237..e2b42997ad33 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -145,7 +145,7 @@ ENTRY(vector_swi)
#endif
enable_irq
- str r4, [sp, #-S_OFF]! @ push fifth arg
+ stmdb sp!, {r4, r5} @ push fifth and sixth args
get_thread_info tsk
ldr ip, [tsk, #TI_FLAGS] @ check for syscall tracing
@@ -204,7 +204,7 @@ ENTRY(sys_call_table)
* Special system call wrappers
*/
@ r0 = syscall number
-@ r5 = syscall table
+@ r8 = syscall table
.type sys_syscall, #function
sys_syscall:
eor scno, r0, #__NR_SYSCALL_BASE
@@ -255,22 +255,6 @@ sys_sigaltstack_wrapper:
ldr r2, [sp, #S_OFF + S_SP]
b do_sigaltstack
-sys_futex_wrapper:
- str r5, [sp, #4] @ push sixth arg
- b sys_futex
-
-sys_arm_fadvise64_64_wrapper:
- str r5, [sp, #4] @ push r5 to stack
- b sys_arm_fadvise64_64
-
-sys_mbind_wrapper:
- str r5, [sp, #4]
- b sys_mbind
-
-sys_ipc_wrapper:
- str r5, [sp, #4] @ push sixth arg
- b sys_ipc
-
/*
* Note: off_4k (r5) is always units of 4K. If we can't do the requested
* offset, we return EINVAL.