1/* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 */ 6#ifndef __ASM_UPROBES_H 7#define __ASM_UPROBES_H 8 9#include <linux/notifier.h> 10#include <linux/types.h> 11 12#include <asm/break.h> 13#include <asm/inst.h> 14 15/* 16 * We want this to be defined as union mips_instruction but that makes the 17 * generic code blow up. 18 */ 19typedef u32 uprobe_opcode_t; 20 21/* 22 * Classic MIPS (note this implementation doesn't consider microMIPS yet) 23 * instructions are always 4 bytes but in order to deal with branches and 24 * their delay slots, we treat instructions as having 8 bytes maximum. 25 */ 26#define MAX_UINSN_BYTES 8 27#define UPROBE_XOL_SLOT_BYTES 128 /* Max. cache line size */ 28 29#define UPROBE_BRK_UPROBE 0x000d000d /* break 13 */ 30#define UPROBE_BRK_UPROBE_XOL 0x000e000d /* break 14 */ 31 32#define UPROBE_SWBP_INSN UPROBE_BRK_UPROBE 33#define UPROBE_SWBP_INSN_SIZE 4 34 35struct arch_uprobe { 36 unsigned long resume_epc; 37 u32 insn[2]; 38 u32 ixol[2]; 39 union mips_instruction orig_inst[MAX_UINSN_BYTES / 4]; 40}; 41 42struct arch_uprobe_task { 43 unsigned long saved_trap_nr; 44}; 45 46extern int arch_uprobe_analyze_insn(struct arch_uprobe *aup, 47 struct mm_struct *mm, unsigned long addr); 48extern int arch_uprobe_pre_xol(struct arch_uprobe *aup, struct pt_regs *regs); 49extern int arch_uprobe_post_xol(struct arch_uprobe *aup, struct pt_regs *regs); 50extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk); 51extern int arch_uprobe_exception_notify(struct notifier_block *self, 52 unsigned long val, void *data); 53extern void arch_uprobe_abort_xol(struct arch_uprobe *aup, 54 struct pt_regs *regs); 55extern unsigned long arch_uretprobe_hijack_return_addr( 56 unsigned long trampoline_vaddr, struct pt_regs *regs); 57 58#endif /* __ASM_UPROBES_H */ 59