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authorJiang Liu <liuj97@gmail.com>2014-01-07 22:17:09 +0800
committerCatalin Marinas <catalin.marinas@arm.com>2014-01-08 15:21:29 +0000
commitae16480785de1da84f21d1698f304a52f9790c49 (patch)
treedc5ecc5f4c146c805321d1c226d47b4add3337d0 /arch/arm64/include/asm/insn.h
parentb11a64a48ccc7ca0ceb33544206934fbd3cdbb22 (diff)
downloadlinux-ae16480785de1da84f21d1698f304a52f9790c49.tar.bz2
arm64: introduce interfaces to hotpatch kernel and module code
Introduce three interfaces to patch kernel and module code: aarch64_insn_patch_text_nosync(): patch code without synchronization, it's caller's responsibility to synchronize all CPUs if needed. aarch64_insn_patch_text_sync(): patch code and always synchronize with stop_machine() aarch64_insn_patch_text(): patch code and synchronize with stop_machine() if needed Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Jiang Liu <liuj97@gmail.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/insn.h')
-rw-r--r--arch/arm64/include/asm/insn.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/insn.h b/arch/arm64/include/asm/insn.h
index 1bdc44c27456..bf8085fdc140 100644
--- a/arch/arm64/include/asm/insn.h
+++ b/arch/arm64/include/asm/insn.h
@@ -18,6 +18,9 @@
#define __ASM_INSN_H
#include <linux/types.h>
+/* A64 instructions are always 32 bits. */
+#define AARCH64_INSN_SIZE 4
+
/*
* ARM Architecture Reference Manual for ARMv8 Profile-A, Issue A.a
* Section C3.1 "A64 instruction index by encoding":
@@ -70,8 +73,13 @@ __AARCH64_INSN_FUNCS(hint, 0xFFFFF01F, 0xD503201F)
bool aarch64_insn_is_nop(u32 insn);
+int aarch64_insn_read(void *addr, u32 *insnp);
+int aarch64_insn_write(void *addr, u32 insn);
enum aarch64_insn_encoding_class aarch64_get_insn_class(u32 insn);
-
bool aarch64_insn_hotpatch_safe(u32 old_insn, u32 new_insn);
+int aarch64_insn_patch_text_nosync(void *addr, u32 insn);
+int aarch64_insn_patch_text_sync(void *addrs[], u32 insns[], int cnt);
+int aarch64_insn_patch_text(void *addrs[], u32 insns[], int cnt);
+
#endif /* __ASM_INSN_H */