xref: /openbmc/linux/arch/powerpc/include/asm/uprobes.h (revision e23feb16)
1 #ifndef _ASM_UPROBES_H
2 #define _ASM_UPROBES_H
3 /*
4  * User-space Probes (UProbes) for powerpc
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19  *
20  * Copyright IBM Corporation, 2007-2012
21  *
22  * Adapted from the x86 port by Ananth N Mavinakayanahalli <ananth@in.ibm.com>
23  */
24 
25 #include <linux/notifier.h>
26 #include <asm/probes.h>
27 
28 typedef ppc_opcode_t uprobe_opcode_t;
29 
30 #define MAX_UINSN_BYTES		4
31 #define UPROBE_XOL_SLOT_BYTES	(MAX_UINSN_BYTES)
32 
33 /* The following alias is needed for reference from arch-agnostic code */
34 #define UPROBE_SWBP_INSN	BREAKPOINT_INSTRUCTION
35 #define UPROBE_SWBP_INSN_SIZE	4 /* swbp insn size in bytes */
36 
37 struct arch_uprobe {
38 	union {
39 		u8	insn[MAX_UINSN_BYTES];
40 		u32	ainsn;
41 	};
42 };
43 
44 struct arch_uprobe_task {
45 	unsigned long	saved_trap_nr;
46 };
47 
48 extern int  arch_uprobe_analyze_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long addr);
49 extern int  arch_uprobe_pre_xol(struct arch_uprobe *aup, struct pt_regs *regs);
50 extern int  arch_uprobe_post_xol(struct arch_uprobe *aup, struct pt_regs *regs);
51 extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk);
52 extern int  arch_uprobe_exception_notify(struct notifier_block *self, unsigned long val, void *data);
53 extern void arch_uprobe_abort_xol(struct arch_uprobe *aup, struct pt_regs *regs);
54 extern unsigned long arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, struct pt_regs *regs);
55 #endif	/* _ASM_UPROBES_H */
56