1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4 */
5
6 #ifndef __PTRACE_USER_H__
7 #define __PTRACE_USER_H__
8
9 #include <sys/ptrace.h>
10 #include <sysdep/ptrace_user.h>
11
12 extern int ptrace_getregs(long pid, unsigned long *regs_out);
13 extern int ptrace_setregs(long pid, unsigned long *regs_in);
14
15 /* syscall emulation path in ptrace */
16
17 #ifndef PTRACE_SYSEMU
18 #define PTRACE_SYSEMU 31
19 #endif
20 #ifndef PTRACE_SYSEMU_SINGLESTEP
21 #define PTRACE_SYSEMU_SINGLESTEP 32
22 #endif
23
24 /* On architectures, that started to support PTRACE_O_TRACESYSGOOD
25 * in linux 2.4, there are two different definitions of
26 * PTRACE_SETOPTIONS: linux 2.4 uses 21 while linux 2.6 uses 0x4200.
27 * For binary compatibility, 2.6 also supports the old "21", named
28 * PTRACE_OLDSETOPTION. On these architectures, UML always must use
29 * "21", to ensure the kernel runs on 2.4 and 2.6 host without
30 * recompilation. So, we use PTRACE_OLDSETOPTIONS in UML.
31 * We also want to be able to build the kernel on 2.4, which doesn't
32 * have PTRACE_OLDSETOPTIONS. So, if it is missing, we declare
33 * PTRACE_OLDSETOPTIONS to be the same as PTRACE_SETOPTIONS.
34 *
35 * On architectures, that start to support PTRACE_O_TRACESYSGOOD on
36 * linux 2.6, PTRACE_OLDSETOPTIONS never is defined, and also isn't
37 * supported by the host kernel. In that case, our trick lets us use
38 * the new 0x4200 with the name PTRACE_OLDSETOPTIONS.
39 */
40 #ifndef PTRACE_OLDSETOPTIONS
41 #define PTRACE_OLDSETOPTIONS PTRACE_SETOPTIONS
42 #endif
43
44 void set_using_sysemu(int value);
45 int get_using_sysemu(void);
46 extern int sysemu_supported;
47
48 #define SELECT_PTRACE_OPERATION(sysemu_mode, singlestep_mode) \
49 (((int[3][3] ) { \
50 { PTRACE_SYSCALL, PTRACE_SYSCALL, PTRACE_SINGLESTEP }, \
51 { PTRACE_SYSEMU, PTRACE_SYSEMU, PTRACE_SINGLESTEP }, \
52 { PTRACE_SYSEMU, PTRACE_SYSEMU_SINGLESTEP, \
53 PTRACE_SYSEMU_SINGLESTEP } }) \
54 [sysemu_mode][singlestep_mode])
55
56 #endif