| 1 | /* GNU/Linux/x86-64 specific target description, for the remote server |
| 2 | for GDB. |
| 3 | Copyright (C) 2017-2019 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "server.h" |
| 21 | #include "tdesc.h" |
| 22 | #include "linux-x86-tdesc.h" |
| 23 | #include "arch/i386.h" |
| 24 | #include "common/x86-xstate.h" |
| 25 | #ifdef __x86_64__ |
| 26 | #include "arch/amd64.h" |
| 27 | #endif |
| 28 | #include "x86-tdesc.h" |
| 29 | |
| 30 | /* Return the right x86_linux_tdesc index for a given XCR0. Return |
| 31 | X86_TDESC_LAST if can't find a match. */ |
| 32 | |
| 33 | static enum x86_linux_tdesc |
| 34 | xcr0_to_tdesc_idx (uint64_t xcr0, bool is_x32) |
| 35 | { |
| 36 | if (xcr0 & X86_XSTATE_PKRU) |
| 37 | { |
| 38 | if (is_x32) |
| 39 | { |
| 40 | /* No x32 MPX and PKU, fall back to avx_avx512. */ |
| 41 | return X86_TDESC_AVX_AVX512; |
| 42 | } |
| 43 | else |
| 44 | return X86_TDESC_AVX_MPX_AVX512_PKU; |
| 45 | } |
| 46 | else if (xcr0 & X86_XSTATE_AVX512) |
| 47 | return X86_TDESC_AVX_AVX512; |
| 48 | else if ((xcr0 & X86_XSTATE_AVX_MPX_MASK) == X86_XSTATE_AVX_MPX_MASK) |
| 49 | { |
| 50 | if (is_x32) /* No MPX on x32. */ |
| 51 | return X86_TDESC_AVX; |
| 52 | else |
| 53 | return X86_TDESC_AVX_MPX; |
| 54 | } |
| 55 | else if (xcr0 & X86_XSTATE_MPX) |
| 56 | { |
| 57 | if (is_x32) /* No MPX on x32. */ |
| 58 | return X86_TDESC_AVX; |
| 59 | else |
| 60 | return X86_TDESC_MPX; |
| 61 | } |
| 62 | else if (xcr0 & X86_XSTATE_AVX) |
| 63 | return X86_TDESC_AVX; |
| 64 | else if (xcr0 & X86_XSTATE_SSE) |
| 65 | return X86_TDESC_SSE; |
| 66 | else if (xcr0 & X86_XSTATE_X87) |
| 67 | return X86_TDESC_MMX; |
| 68 | else |
| 69 | return X86_TDESC_LAST; |
| 70 | } |
| 71 | |
| 72 | #if defined __i386__ || !defined IN_PROCESS_AGENT |
| 73 | |
| 74 | static struct target_desc *i386_tdescs[X86_TDESC_LAST] = { }; |
| 75 | |
| 76 | /* Return the target description according to XCR0. */ |
| 77 | |
| 78 | const struct target_desc * |
| 79 | i386_linux_read_description (uint64_t xcr0) |
| 80 | { |
| 81 | enum x86_linux_tdesc idx = xcr0_to_tdesc_idx (xcr0, false); |
| 82 | |
| 83 | if (idx == X86_TDESC_LAST) |
| 84 | return NULL; |
| 85 | |
| 86 | struct target_desc **tdesc = &i386_tdescs[idx]; |
| 87 | |
| 88 | if (*tdesc == NULL) |
| 89 | { |
| 90 | *tdesc = i386_create_target_description (xcr0, true, false); |
| 91 | |
| 92 | init_target_desc (*tdesc, i386_expedite_regs); |
| 93 | } |
| 94 | |
| 95 | return *tdesc;; |
| 96 | } |
| 97 | #endif |
| 98 | |
| 99 | #ifdef __x86_64__ |
| 100 | |
| 101 | static target_desc *amd64_tdescs[X86_TDESC_LAST] = { }; |
| 102 | static target_desc *x32_tdescs[X86_TDESC_LAST] = { }; |
| 103 | |
| 104 | const struct target_desc * |
| 105 | amd64_linux_read_description (uint64_t xcr0, bool is_x32) |
| 106 | { |
| 107 | enum x86_linux_tdesc idx = xcr0_to_tdesc_idx (xcr0, is_x32); |
| 108 | |
| 109 | if (idx == X86_TDESC_LAST) |
| 110 | return NULL; |
| 111 | |
| 112 | struct target_desc **tdesc = NULL; |
| 113 | |
| 114 | if (is_x32) |
| 115 | tdesc = &x32_tdescs[idx]; |
| 116 | else |
| 117 | tdesc = &amd64_tdescs[idx]; |
| 118 | |
| 119 | if (*tdesc == NULL) |
| 120 | { |
| 121 | *tdesc = amd64_create_target_description (xcr0, is_x32, true, true); |
| 122 | |
| 123 | init_target_desc (*tdesc, amd64_expedite_regs); |
| 124 | } |
| 125 | return *tdesc; |
| 126 | } |
| 127 | |
| 128 | #endif |
| 129 | |
| 130 | #ifndef IN_PROCESS_AGENT |
| 131 | |
| 132 | int |
| 133 | i386_get_ipa_tdesc_idx (const struct target_desc *tdesc) |
| 134 | { |
| 135 | for (int i = 0; i < X86_TDESC_LAST; i++) |
| 136 | { |
| 137 | if (tdesc == i386_tdescs[i]) |
| 138 | return i; |
| 139 | } |
| 140 | |
| 141 | /* If none tdesc is found, return the one with minimum features. */ |
| 142 | return X86_TDESC_MMX; |
| 143 | } |
| 144 | |
| 145 | #if defined __x86_64__ |
| 146 | int |
| 147 | amd64_get_ipa_tdesc_idx (const struct target_desc *tdesc) |
| 148 | { |
| 149 | for (int i = 0; i < X86_TDESC_LAST; i++) |
| 150 | { |
| 151 | if (tdesc == amd64_tdescs[i]) |
| 152 | return i; |
| 153 | } |
| 154 | for (int i = 0; i < X86_TDESC_LAST; i++) |
| 155 | { |
| 156 | if (tdesc == x32_tdescs[i]) |
| 157 | return i; |
| 158 | } |
| 159 | |
| 160 | return X86_TDESC_SSE; |
| 161 | } |
| 162 | |
| 163 | #endif |
| 164 | #endif |