| Ralf Baechle | 40e084a | 2015-07-29 22:44:53 +0200 | [diff] [blame] | 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 | */ |
| 19 | typedef 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 | |
| 35 | struct 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 | |
| 42 | struct arch_uprobe_task { |
| 43 | unsigned long saved_trap_nr; |
| 44 | }; |
| 45 | |
| 46 | extern int arch_uprobe_analyze_insn(struct arch_uprobe *aup, |
| 47 | struct mm_struct *mm, unsigned long addr); |
| 48 | extern int arch_uprobe_pre_xol(struct arch_uprobe *aup, struct pt_regs *regs); |
| 49 | extern int arch_uprobe_post_xol(struct arch_uprobe *aup, struct pt_regs *regs); |
| 50 | extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk); |
| 51 | extern int arch_uprobe_exception_notify(struct notifier_block *self, |
| 52 | unsigned long val, void *data); |
| 53 | extern void arch_uprobe_abort_xol(struct arch_uprobe *aup, |
| 54 | struct pt_regs *regs); |
| 55 | extern unsigned long arch_uretprobe_hijack_return_addr( |
| 56 | unsigned long trampoline_vaddr, struct pt_regs *regs); |
| 57 | |
| 58 | #endif /* __ASM_UPROBES_H */ |