1 /* Fetch live process registers from TID.
2 Copyright (C) 2013 Red Hat, Inc.
3 This file is part of elfutils.
4
5 This file is free software; you can redistribute it and/or modify
6 it under the terms of either
7
8 * the GNU Lesser General Public License as published by the Free
9 Software Foundation; either version 3 of the License, or (at
10 your option) any later version
11
12 or
13
14 * the GNU General Public License as published by the Free
15 Software Foundation; either version 2 of the License, or (at
16 your option) any later version
17
18 or both in parallel, as here.
19
20 elfutils is distributed in the hope that it will be useful, but
21 WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 General Public License for more details.
24
25 You should have received copies of the GNU General Public License and
26 the GNU Lesser General Public License along with this program. If
27 not, see <http://www.gnu.org/licenses/>. */
28
29 #ifdef HAVE_CONFIG_H
30 # include <config.h>
31 #endif
32
33 #include <stdlib.h>
34 #if defined(__powerpc__) && defined(__linux__)
35 # include <sys/ptrace.h>
36 # include <sys/user.h>
37 #endif
38
39 #include "system.h"
40
41 #define BACKEND ppc_
42 #include "libebl_CPU.h"
43
44 bool
ppc_dwarf_to_regno(Ebl * ebl,unsigned * regno)45 ppc_dwarf_to_regno (Ebl *ebl __attribute__ ((unused)), unsigned *regno)
46 {
47 switch (*regno)
48 {
49 case 108:
50 // LR uses both 65 and 108 numbers, there is no consistency for it.
51 *regno = 65;
52 return true;
53 case 0 ... 107:
54 case 109 ... (114 - 1) -1:
55 return true;
56 case 1200 ... 1231:
57 *regno = *regno - 1200 + (114 - 1);
58 return true;
59 default:
60 return false;
61 }
62 abort ();
63 }
64
65 __typeof (ppc_dwarf_to_regno)
66 ppc64_dwarf_to_regno
67 __attribute__ ((alias ("ppc_dwarf_to_regno")));
68
69 bool
ppc_set_initial_registers_tid(pid_t tid,ebl_tid_registers_t * setfunc,void * arg)70 ppc_set_initial_registers_tid (pid_t tid __attribute__ ((unused)),
71 ebl_tid_registers_t *setfunc __attribute__ ((unused)),
72 void *arg __attribute__ ((unused)))
73 {
74 #if !defined(__powerpc__) || !defined(__linux__)
75 return false;
76 #else /* __powerpc__ */
77 union
78 {
79 struct pt_regs r;
80 long l[sizeof (struct pt_regs) / sizeof (long)];
81 }
82 user_regs;
83 eu_static_assert (sizeof (struct pt_regs) % sizeof (long) == 0);
84 /* PTRACE_GETREGS is EIO on kernel-2.6.18-308.el5.ppc64. */
85 errno = 0;
86 for (unsigned regno = 0; regno < sizeof (user_regs) / sizeof (long);
87 regno++)
88 {
89 user_regs.l[regno] = ptrace (PTRACE_PEEKUSER, tid,
90 (void *) (uintptr_t) (regno
91 * sizeof (long)),
92 NULL);
93 if (errno != 0)
94 return false;
95 }
96 #define GPRS (sizeof (user_regs.r.gpr) / sizeof (*user_regs.r.gpr))
97 Dwarf_Word dwarf_regs[GPRS];
98 for (unsigned gpr = 0; gpr < GPRS; gpr++)
99 dwarf_regs[gpr] = user_regs.r.gpr[gpr];
100 if (! setfunc (0, GPRS, dwarf_regs, arg))
101 return false;
102 dwarf_regs[0] = user_regs.r.link;
103 // LR uses both 65 and 108 numbers, there is no consistency for it.
104 if (! setfunc (65, 1, dwarf_regs, arg))
105 return false;
106 /* Registers like msr, ctr, xer, dar, dsisr etc. are probably irrelevant
107 for CFI. */
108 dwarf_regs[0] = user_regs.r.nip;
109 return setfunc (-1, 1, dwarf_regs, arg);
110 #endif /* __powerpc__ */
111 }
112
113 __typeof (ppc_set_initial_registers_tid)
114 ppc64_set_initial_registers_tid
115 __attribute__ ((alias ("ppc_set_initial_registers_tid")));
116