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authorRalf Baechle <ralf@linux-mips.org>2015-07-29 22:44:53 +0200
committerRalf Baechle <ralf@linux-mips.org>2015-09-03 12:08:05 +0200
commit40e084a506eba78310cd5e8ab700fd1226c6130a (patch)
treea7d19eea2c8a72c78205f2403be2ea3cde24ce63 /arch/mips/include/asm/uprobes.h
parente3b28831c18c6c95c51b6bb717fa116d2b658ba9 (diff)
MIPS: Add uprobes support.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include/asm/uprobes.h')
-rw-r--r--arch/mips/include/asm/uprobes.h58
1 files changed, 58 insertions, 0 deletions
diff --git a/arch/mips/include/asm/uprobes.h b/arch/mips/include/asm/uprobes.h
new file mode 100644
index 000000000000..34c325c674c4
--- /dev/null
+++ b/arch/mips/include/asm/uprobes.h
@@ -0,0 +1,58 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#ifndef __ASM_UPROBES_H
+#define __ASM_UPROBES_H
+
+#include <linux/notifier.h>
+#include <linux/types.h>
+
+#include <asm/break.h>
+#include <asm/inst.h>
+
+/*
+ * We want this to be defined as union mips_instruction but that makes the
+ * generic code blow up.
+ */
+typedef u32 uprobe_opcode_t;
+
+/*
+ * Classic MIPS (note this implementation doesn't consider microMIPS yet)
+ * instructions are always 4 bytes but in order to deal with branches and
+ * their delay slots, we treat instructions as having 8 bytes maximum.
+ */
+#define MAX_UINSN_BYTES 8
+#define UPROBE_XOL_SLOT_BYTES 128 /* Max. cache line size */
+
+#define UPROBE_BRK_UPROBE 0x000d000d /* break 13 */
+#define UPROBE_BRK_UPROBE_XOL 0x000e000d /* break 14 */
+
+#define UPROBE_SWBP_INSN UPROBE_BRK_UPROBE
+#define UPROBE_SWBP_INSN_SIZE 4
+
+struct arch_uprobe {
+ unsigned long resume_epc;
+ u32 insn[2];
+ u32 ixol[2];
+ union mips_instruction orig_inst[MAX_UINSN_BYTES / 4];
+};
+
+struct arch_uprobe_task {
+ unsigned long saved_trap_nr;
+};
+
+extern int arch_uprobe_analyze_insn(struct arch_uprobe *aup,
+ struct mm_struct *mm, unsigned long addr);
+extern int arch_uprobe_pre_xol(struct arch_uprobe *aup, struct pt_regs *regs);
+extern int arch_uprobe_post_xol(struct arch_uprobe *aup, struct pt_regs *regs);
+extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk);
+extern int arch_uprobe_exception_notify(struct notifier_block *self,
+ unsigned long val, void *data);
+extern void arch_uprobe_abort_xol(struct arch_uprobe *aup,
+ struct pt_regs *regs);
+extern unsigned long arch_uretprobe_hijack_return_addr(
+ unsigned long trampoline_vaddr, struct pt_regs *regs);
+
+#endif /* __ASM_UPROBES_H */