Commit | Line | Data |
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3666a048 | 1 | /*Copyright (C) 2015-2021 Free Software Foundation, Inc. |
cdf43629 YQ |
2 | |
3 | This file is part of GDB. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
268a13a5 | 18 | #include "gdbsupport/common-defs.h" |
cdf43629 | 19 | #include "ppc-linux.h" |
2e077f5e | 20 | #include "nat/gdb_ptrace.h" |
cdf43629 YQ |
21 | #include <elf.h> |
22 | ||
23 | #ifdef HAVE_GETAUXVAL | |
24 | #include <sys/auxv.h> | |
25 | #endif | |
26 | ||
27 | #ifdef __powerpc64__ | |
28 | ||
29 | /* Get the HWCAP from the process of GDB or GDBserver. If success, | |
30 | save it in *VALP. */ | |
31 | ||
32 | static void | |
33 | ppc64_host_hwcap (unsigned long *valp) | |
34 | { | |
35 | #ifdef HAVE_GETAUXVAL | |
36 | *valp = getauxval (AT_HWCAP); | |
37 | #else | |
38 | unsigned long data[2]; | |
39 | FILE *f = fopen ("/proc/self/auxv", "r"); | |
40 | ||
41 | if (f == NULL) | |
42 | return; | |
43 | ||
44 | while (fread (data, sizeof (data), 1, f) > 0) | |
45 | { | |
46 | if (data[0] == AT_HWCAP) | |
47 | { | |
48 | *valp = data[1]; | |
49 | break; | |
50 | } | |
51 | } | |
52 | ||
53 | fclose (f); | |
54 | #endif /* HAVE_GETAUXVAL */ | |
55 | } | |
56 | ||
2e077f5e | 57 | static inline int |
cdf43629 YQ |
58 | ppc64_64bit_inferior_p (long msr) |
59 | { | |
60 | unsigned long ppc_host_hwcap = 0; | |
61 | ||
62 | /* Get host's HWCAP to check whether the machine is Book E. */ | |
63 | ppc64_host_hwcap (&ppc_host_hwcap); | |
64 | ||
65 | /* We actually have a 64-bit inferior only if the certain bit of the | |
66 | MSR is set. The PowerISA Book III-S MSR is different from the | |
67 | PowerISA Book III-E MSR. The Book III-S MSR is 64 bits wide, and | |
68 | its MSR[SF] is the bit 0 of a 64-bit value. Book III-E MSR is 32 | |
69 | bits wide, and its MSR[CM] is the bit 0 of a 32-bit value. */ | |
70 | if (ppc_host_hwcap & PPC_FEATURE_BOOKE) | |
71 | return msr & 0x80000000; | |
72 | else | |
73 | return msr < 0; | |
74 | } | |
75 | ||
76 | #endif | |
2e077f5e PFC |
77 | |
78 | int | |
79 | ppc_linux_target_wordsize (int tid) | |
80 | { | |
81 | int wordsize = 4; | |
82 | ||
83 | /* Check for 64-bit inferior process. This is the case when the host is | |
84 | 64-bit, and in addition the top bit of the MSR register is set. */ | |
85 | #ifdef __powerpc64__ | |
86 | long msr; | |
87 | ||
88 | errno = 0; | |
89 | msr = (long) ptrace (PTRACE_PEEKUSER, tid, PT_MSR * 8, 0); | |
90 | if (errno == 0 && ppc64_64bit_inferior_p (msr)) | |
91 | wordsize = 8; | |
92 | #endif | |
93 | ||
94 | return wordsize; | |
95 | } |