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authorRussell King <rmk+kernel@arm.linux.org.uk>2015-02-10 10:26:38 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2015-02-10 10:26:38 +0000
commitdf9ab9771c64f5229843bfe2a20fe0ee6ac59fc1 (patch)
treea091be1024bd76627f78e791e377126e47703b7b /arch/arm/include
parented8f8ce38d0f7b505d7da2d79522972e962457c2 (diff)
parent4e1c0664de11e4b5861957ab4ddff2aeeffd042f (diff)
downloadop-kernel-dev-df9ab9771c64f5229843bfe2a20fe0ee6ac59fc1.zip
op-kernel-dev-df9ab9771c64f5229843bfe2a20fe0ee6ac59fc1.tar.gz
Merge branch 'devel-stable' into for-next
Diffstat (limited to 'arch/arm/include')
-rw-r--r--arch/arm/include/asm/insn.h29
-rw-r--r--arch/arm/include/asm/kprobes.h33
-rw-r--r--arch/arm/include/asm/patch.h17
-rw-r--r--arch/arm/include/asm/probes.h15
4 files changed, 93 insertions, 1 deletions
diff --git a/arch/arm/include/asm/insn.h b/arch/arm/include/asm/insn.h
new file mode 100644
index 0000000..e96065d
--- /dev/null
+++ b/arch/arm/include/asm/insn.h
@@ -0,0 +1,29 @@
+#ifndef __ASM_ARM_INSN_H
+#define __ASM_ARM_INSN_H
+
+static inline unsigned long
+arm_gen_nop(void)
+{
+#ifdef CONFIG_THUMB2_KERNEL
+ return 0xf3af8000; /* nop.w */
+#else
+ return 0xe1a00000; /* mov r0, r0 */
+#endif
+}
+
+unsigned long
+__arm_gen_branch(unsigned long pc, unsigned long addr, bool link);
+
+static inline unsigned long
+arm_gen_branch(unsigned long pc, unsigned long addr)
+{
+ return __arm_gen_branch(pc, addr, false);
+}
+
+static inline unsigned long
+arm_gen_branch_link(unsigned long pc, unsigned long addr)
+{
+ return __arm_gen_branch(pc, addr, true);
+}
+
+#endif
diff --git a/arch/arm/include/asm/kprobes.h b/arch/arm/include/asm/kprobes.h
index 49fa0df..3ea9be5 100644
--- a/arch/arm/include/asm/kprobes.h
+++ b/arch/arm/include/asm/kprobes.h
@@ -22,7 +22,6 @@
#define __ARCH_WANT_KPROBES_INSN_SLOT
#define MAX_INSN_SIZE 2
-#define MAX_STACK_SIZE 64 /* 32 would probably be OK */
#define flush_insn_slot(p) do { } while (0)
#define kretprobe_blacklist_size 0
@@ -51,5 +50,37 @@ int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr);
int kprobe_exceptions_notify(struct notifier_block *self,
unsigned long val, void *data);
+/* optinsn template addresses */
+extern __visible kprobe_opcode_t optprobe_template_entry;
+extern __visible kprobe_opcode_t optprobe_template_val;
+extern __visible kprobe_opcode_t optprobe_template_call;
+extern __visible kprobe_opcode_t optprobe_template_end;
+extern __visible kprobe_opcode_t optprobe_template_sub_sp;
+extern __visible kprobe_opcode_t optprobe_template_add_sp;
+extern __visible kprobe_opcode_t optprobe_template_restore_begin;
+extern __visible kprobe_opcode_t optprobe_template_restore_orig_insn;
+extern __visible kprobe_opcode_t optprobe_template_restore_end;
+
+#define MAX_OPTIMIZED_LENGTH 4
+#define MAX_OPTINSN_SIZE \
+ ((unsigned long)&optprobe_template_end - \
+ (unsigned long)&optprobe_template_entry)
+#define RELATIVEJUMP_SIZE 4
+
+struct arch_optimized_insn {
+ /*
+ * copy of the original instructions.
+ * Different from x86, ARM kprobe_opcode_t is u32.
+ */
+#define MAX_COPIED_INSN DIV_ROUND_UP(RELATIVEJUMP_SIZE, sizeof(kprobe_opcode_t))
+ kprobe_opcode_t copied_insn[MAX_COPIED_INSN];
+ /* detour code buffer */
+ kprobe_opcode_t *insn;
+ /*
+ * We always copy one instruction on ARM,
+ * so size will always be 4, and unlike x86, there is no
+ * need for a size field.
+ */
+};
#endif /* _ARM_KPROBES_H */
diff --git a/arch/arm/include/asm/patch.h b/arch/arm/include/asm/patch.h
new file mode 100644
index 0000000..77e054c
--- /dev/null
+++ b/arch/arm/include/asm/patch.h
@@ -0,0 +1,17 @@
+#ifndef _ARM_KERNEL_PATCH_H
+#define _ARM_KERNEL_PATCH_H
+
+void patch_text(void *addr, unsigned int insn);
+void __patch_text_real(void *addr, unsigned int insn, bool remap);
+
+static inline void __patch_text(void *addr, unsigned int insn)
+{
+ __patch_text_real(addr, insn, true);
+}
+
+static inline void __patch_text_early(void *addr, unsigned int insn)
+{
+ __patch_text_real(addr, insn, false);
+}
+
+#endif
diff --git a/arch/arm/include/asm/probes.h b/arch/arm/include/asm/probes.h
index 806cfe6..1e5b9bb 100644
--- a/arch/arm/include/asm/probes.h
+++ b/arch/arm/include/asm/probes.h
@@ -19,6 +19,8 @@
#ifndef _ASM_PROBES_H
#define _ASM_PROBES_H
+#ifndef __ASSEMBLY__
+
typedef u32 probes_opcode_t;
struct arch_probes_insn;
@@ -38,6 +40,19 @@ struct arch_probes_insn {
probes_check_cc *insn_check_cc;
probes_insn_singlestep_t *insn_singlestep;
probes_insn_fn_t *insn_fn;
+ int stack_space;
+ unsigned long register_usage_flags;
+ bool kprobe_direct_exec;
};
+#endif /* __ASSEMBLY__ */
+
+/*
+ * We assume one instruction can consume at most 64 bytes stack, which is
+ * 'push {r0-r15}'. Instructions consume more or unknown stack space like
+ * 'str r0, [sp, #-80]' and 'str r0, [sp, r1]' should be prohibit to probe.
+ * Both kprobe and jprobe use this macro.
+ */
+#define MAX_STACK_SIZE 64
+
#endif
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