Messages in this thread Patch in this message | | | Date | Fri, 16 Apr 2010 11:24:58 -0400 | From | Jason Baron <> | Subject | [PATCH 10/11] sparc64: Add jump_label support |
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From: David S. Miller <davem@davemloft.net>
Add jump label support for sparc64.
Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Jason Baron <jbaron@redhat.com> --- arch/sparc/Kconfig | 1 + arch/sparc/include/asm/jump_entry.h | 16 ++++++++++++++ arch/sparc/include/asm/jump_label.h | 21 +++++++++++++++++++ arch/sparc/kernel/Makefile | 2 + arch/sparc/kernel/jump_label.c | 38 +++++++++++++++++++++++++++++++++++ arch/sparc/kernel/module.c | 6 +++++ 6 files changed, 84 insertions(+), 0 deletions(-) create mode 100644 arch/sparc/include/asm/jump_entry.h create mode 100644 arch/sparc/include/asm/jump_label.h create mode 100644 arch/sparc/kernel/jump_label.c
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index d6781ce..0c581d4 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -29,6 +29,7 @@ config SPARC select PERF_USE_VMALLOC select HAVE_DMA_ATTRS select HAVE_DMA_API_DEBUG + select HAVE_ARCH_JUMP_LABEL config SPARC32 def_bool !64BIT diff --git a/arch/sparc/include/asm/jump_entry.h b/arch/sparc/include/asm/jump_entry.h new file mode 100644 index 0000000..6bb85e4 --- /dev/null +++ b/arch/sparc/include/asm/jump_entry.h @@ -0,0 +1,16 @@ +#ifndef _LINUX_JUMP_ENTRY_H +#define _LINUX_JUMP_ENTRY_H + +/* Defined in a separate file, so that it can be used by user program modpost.c + * This file is included by include/asm/jump_label.h, in turn included by + * include/linux/jump_label.h. Kernel sources should only include + * include/linux/jump_label.h. + **/ + +struct jump_entry { + __u32 code; + __u32 target; + __u32 name; +}; + +#endif diff --git a/arch/sparc/include/asm/jump_label.h b/arch/sparc/include/asm/jump_label.h new file mode 100644 index 0000000..32d2c2f --- /dev/null +++ b/arch/sparc/include/asm/jump_label.h @@ -0,0 +1,21 @@ +#ifndef _ASM_SPARC_JUMP_LABEL_H +#define _ASM_SPARC_JUMP_LABEL_H + +#include <linux/types.h> +#include <asm/jump_entry.h> + +#define JUMP_LABEL_NOP_SIZE 4 + +#define JUMP_LABEL(tag, label, cond) \ + do { \ + extern const char __jlstrtab_##tag[]; \ + asm goto("1:\n\t" \ + "nop\n\t" \ + "nop\n\t" \ + ".pushsection __jump_table, \"a\"\n\t"\ + ".xword 1b, %l[" #label "], %c0\n\t" \ + ".popsection \n\t" \ + : : "i" (__jlstrtab_##tag) : : label);\ + } while (0) + +#endif diff --git a/arch/sparc/kernel/Makefile b/arch/sparc/kernel/Makefile index 0c2dc1f..599398f 100644 --- a/arch/sparc/kernel/Makefile +++ b/arch/sparc/kernel/Makefile @@ -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 index 0000000..c1aa2d8 --- /dev/null +++ b/arch/sparc/kernel/jump_label.c @@ -0,0 +1,38 @@ +#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, *insn = (u32 *) entry->code; + + val = *insn; + if (type == JUMP_LABEL_ENABLE) { + s32 off = (s32)entry->target - (s32)entry->code; + val = 0x40000000 | ((u32) off >> 2); + } else { + val = 0x01000000; + } + + get_online_cpus(); + mutex_lock(&text_mutex); + *insn = val; + flushi(insn); + mutex_unlock(&text_mutex); + put_online_cpus(); +} + +static const u8 jump_label_nop[JUMP_LABEL_NOP_SIZE] = { 0x01, 0x00, 0x00, 0x00 }; + +const u8 *arch_get_jump_label_nop() +{ + return jump_label_nop; +} + +#endif diff --git a/arch/sparc/kernel/module.c b/arch/sparc/kernel/module.c index f848aad..37cf439 100644 --- a/arch/sparc/kernel/module.c +++ b/arch/sparc/kernel/module.c @@ -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 */ + apply_jump_label_nops(me); + /* Cheetah's I-cache is fully coherent. */ if (tlb_type == spitfire) { unsigned long va; -- 1.7.0.1
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