jump label: Add sparc64 support
David S. Miller [Fri, 17 Sep 2010 15:09:25 +0000 (11:09 -0400)]
Add jump label support for sparc64.

Signed-off-by: David S. Miller <davem@davemloft.net>
LKML-Reference: <3b5b071fcdb2afb7f67cacecfa78b14c740278a7.1284733808.git.jbaron@redhat.com>
Signed-off-by: Jason Baron <jbaron@redhat.com>

[ cleaned up some formatting ]

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

arch/sparc/Kconfig
arch/sparc/include/asm/jump_label.h [new file with mode: 0644]
arch/sparc/kernel/Makefile
arch/sparc/kernel/jump_label.c [new file with mode: 0644]
arch/sparc/kernel/module.c

index 491e9d6..a81b04e 100644 (file)
@@ -30,6 +30,7 @@ config SPARC
        select PERF_USE_VMALLOC
        select HAVE_DMA_ATTRS
        select HAVE_DMA_API_DEBUG
+       select HAVE_ARCH_JUMP_LABEL if !CC_OPTIMIZE_FOR_SIZE
 
 config SPARC32
        def_bool !64BIT
diff --git a/arch/sparc/include/asm/jump_label.h b/arch/sparc/include/asm/jump_label.h
new file mode 100644 (file)
index 0000000..62e66d7
--- /dev/null
@@ -0,0 +1,32 @@
+#ifndef _ASM_SPARC_JUMP_LABEL_H
+#define _ASM_SPARC_JUMP_LABEL_H
+
+#ifdef __KERNEL__
+
+#include <linux/types.h>
+#include <asm/system.h>
+
+#define JUMP_LABEL_NOP_SIZE 4
+
+#define JUMP_LABEL(key, label)                                 \
+       do {                                                    \
+               asm goto("1:\n\t"                               \
+                        "nop\n\t"                              \
+                        "nop\n\t"                              \
+                        ".pushsection __jump_table,  \"a\"\n\t"\
+                        ".word 1b, %l[" #label "], %c0\n\t"    \
+                        ".popsection \n\t"                     \
+                        : :  "i" (key) :  : label);\
+       } while (0)
+
+#endif /* __KERNEL__ */
+
+typedef u32 jump_label_t;
+
+struct jump_entry {
+       jump_label_t code;
+       jump_label_t target;
+       jump_label_t key;
+};
+
+#endif
index 0c2dc1f..599398f 100644 (file)
@@ -119,3 +119,5 @@ obj-$(CONFIG_COMPAT)    += $(audit--y)
 
 pc--$(CONFIG_PERF_EVENTS) := perf_event.o
 obj-$(CONFIG_SPARC64)  += $(pc--y)
+
+obj-$(CONFIG_SPARC64)  += jump_label.o
diff --git a/arch/sparc/kernel/jump_label.c b/arch/sparc/kernel/jump_label.c
new file mode 100644 (file)
index 0000000..ea2dafc
--- /dev/null
@@ -0,0 +1,47 @@
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/mutex.h>
+#include <linux/cpu.h>
+
+#include <linux/jump_label.h>
+#include <linux/memory.h>
+
+#ifdef HAVE_JUMP_LABEL
+
+void arch_jump_label_transform(struct jump_entry *entry,
+                              enum jump_label_type type)
+{
+       u32 val;
+       u32 *insn = (u32 *) (unsigned long) entry->code;
+
+       if (type == JUMP_LABEL_ENABLE) {
+               s32 off = (s32)entry->target - (s32)entry->code;
+
+#ifdef CONFIG_SPARC64
+               /* ba,pt %xcc, . + (off << 2) */
+               val = 0x10680000 | ((u32) off >> 2);
+#else
+               /* ba . + (off << 2) */
+               val = 0x10800000 | ((u32) off >> 2);
+#endif
+       } else {
+               val = 0x01000000;
+       }
+
+       get_online_cpus();
+       mutex_lock(&text_mutex);
+       *insn = val;
+       flushi(insn);
+       mutex_unlock(&text_mutex);
+       put_online_cpus();
+}
+
+void arch_jump_label_text_poke_early(jump_label_t addr)
+{
+       u32 *insn_p = (u32 *) (unsigned long) addr;
+
+       *insn_p = 0x01000000;
+       flushi(insn_p);
+}
+
+#endif
index f848aad..ee3c7dd 100644 (file)
@@ -18,6 +18,9 @@
 #include <asm/spitfire.h>
 
 #ifdef CONFIG_SPARC64
+
+#include <linux/jump_label.h>
+
 static void *module_map(unsigned long size)
 {
        struct vm_struct *area;
@@ -227,6 +230,9 @@ int module_finalize(const Elf_Ehdr *hdr,
                    const Elf_Shdr *sechdrs,
                    struct module *me)
 {
+       /* make jump label nops */
+       jump_label_apply_nops(me);
+
        /* Cheetah's I-cache is fully coherent.  */
        if (tlb_type == spitfire) {
                unsigned long va;