| 1 | /* GNU/Linux S/390 specific low level interface, for the in-process |
| 2 | agent library for GDB. |
| 3 | |
| 4 | Copyright (C) 2016-2020 Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include "server.h" |
| 22 | #include <sys/mman.h> |
| 23 | #include "tracepoint.h" |
| 24 | #include "linux-s390-tdesc.h" |
| 25 | #include <elf.h> |
| 26 | #ifdef HAVE_GETAUXVAL |
| 27 | #include <sys/auxv.h> |
| 28 | #endif |
| 29 | |
| 30 | #define FT_FPR(x) (0x000 + (x) * 0x10) |
| 31 | #define FT_VR(x) (0x000 + (x) * 0x10) |
| 32 | #define FT_VR_L(x) (0x008 + (x) * 0x10) |
| 33 | #define FT_GPR(x) (0x200 + (x) * 8) |
| 34 | #define FT_GPR_U(x) (0x200 + (x) * 8) |
| 35 | #define FT_GPR_L(x) (0x204 + (x) * 8) |
| 36 | #define FT_GPR(x) (0x200 + (x) * 8) |
| 37 | #define FT_ACR(x) (0x280 + (x) * 4) |
| 38 | #define FT_PSWM 0x2c0 |
| 39 | #define FT_PSWM_U 0x2c0 |
| 40 | #define FT_PSWA 0x2c8 |
| 41 | #define FT_PSWA_L 0x2cc |
| 42 | #define FT_FPC 0x2d0 |
| 43 | |
| 44 | /* Mappings between registers collected by the jump pad and GDB's register |
| 45 | array layout used by regcache. |
| 46 | |
| 47 | See linux-s390-low.c (s390_install_fast_tracepoint_jump_pad) for more |
| 48 | details. */ |
| 49 | |
| 50 | #ifndef __s390x__ |
| 51 | |
| 52 | /* Used for s390-linux32, s390-linux32v1, s390-linux32v2. */ |
| 53 | |
| 54 | static const int s390_linux32_ft_collect_regmap[] = { |
| 55 | /* 32-bit PSWA and PSWM. */ |
| 56 | FT_PSWM_U, FT_PSWA_L, |
| 57 | /* 32-bit GPRs (mapped to lower halves of 64-bit slots). */ |
| 58 | FT_GPR_L (0), FT_GPR_L (1), FT_GPR_L (2), FT_GPR_L (3), |
| 59 | FT_GPR_L (4), FT_GPR_L (5), FT_GPR_L (6), FT_GPR_L (7), |
| 60 | FT_GPR_L (8), FT_GPR_L (9), FT_GPR_L (10), FT_GPR_L (11), |
| 61 | FT_GPR_L (12), FT_GPR_L (13), FT_GPR_L (14), FT_GPR_L (15), |
| 62 | /* ACRs */ |
| 63 | FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3), |
| 64 | FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7), |
| 65 | FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11), |
| 66 | FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15), |
| 67 | /* FPRs (mapped to upper halves of 128-bit VR slots). */ |
| 68 | FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3), |
| 69 | FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7), |
| 70 | FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11), |
| 71 | FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15), |
| 72 | /* orig_r2, last_break, system_call */ |
| 73 | -1, -1, -1, |
| 74 | }; |
| 75 | |
| 76 | /* Used for s390-linux64, s390-linux64v1, s390-linux64v2, s390-vx-linux64. */ |
| 77 | |
| 78 | static const int s390_linux64_ft_collect_regmap[] = { |
| 79 | /* 32-bit PSWA and PSWM. */ |
| 80 | FT_PSWM_U, FT_PSWA_L, |
| 81 | /* 32-bit halves of 64-bit GPRs. */ |
| 82 | FT_GPR_U (0), FT_GPR_L (0), |
| 83 | FT_GPR_U (1), FT_GPR_L (1), |
| 84 | FT_GPR_U (2), FT_GPR_L (2), |
| 85 | FT_GPR_U (3), FT_GPR_L (3), |
| 86 | FT_GPR_U (4), FT_GPR_L (4), |
| 87 | FT_GPR_U (5), FT_GPR_L (5), |
| 88 | FT_GPR_U (6), FT_GPR_L (6), |
| 89 | FT_GPR_U (7), FT_GPR_L (7), |
| 90 | FT_GPR_U (8), FT_GPR_L (8), |
| 91 | FT_GPR_U (9), FT_GPR_L (9), |
| 92 | FT_GPR_U (10), FT_GPR_L (10), |
| 93 | FT_GPR_U (11), FT_GPR_L (11), |
| 94 | FT_GPR_U (12), FT_GPR_L (12), |
| 95 | FT_GPR_U (13), FT_GPR_L (13), |
| 96 | FT_GPR_U (14), FT_GPR_L (14), |
| 97 | FT_GPR_U (15), FT_GPR_L (15), |
| 98 | /* ACRs */ |
| 99 | FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3), |
| 100 | FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7), |
| 101 | FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11), |
| 102 | FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15), |
| 103 | /* FPRs (mapped to upper halves of 128-bit VR slots). */ |
| 104 | FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3), |
| 105 | FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7), |
| 106 | FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11), |
| 107 | FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15), |
| 108 | /* orig_r2, last_break, system_call */ |
| 109 | -1, -1, -1, |
| 110 | /* Lower halves of 128-bit VRs. */ |
| 111 | FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3), |
| 112 | FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7), |
| 113 | FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11), |
| 114 | FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15), |
| 115 | /* And the next 16 VRs. */ |
| 116 | FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19), |
| 117 | FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23), |
| 118 | FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27), |
| 119 | FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31), |
| 120 | }; |
| 121 | |
| 122 | /* Used for s390-te-linux64, s390-tevx-linux64, and s390-gs-linux64. */ |
| 123 | |
| 124 | static const int s390_te_linux64_ft_collect_regmap[] = { |
| 125 | /* 32-bit PSWA and PSWM. */ |
| 126 | FT_PSWM_U, FT_PSWA_L, |
| 127 | /* 32-bit halves of 64-bit GPRs. */ |
| 128 | FT_GPR_U (0), FT_GPR_L (0), |
| 129 | FT_GPR_U (1), FT_GPR_L (1), |
| 130 | FT_GPR_U (2), FT_GPR_L (2), |
| 131 | FT_GPR_U (3), FT_GPR_L (3), |
| 132 | FT_GPR_U (4), FT_GPR_L (4), |
| 133 | FT_GPR_U (5), FT_GPR_L (5), |
| 134 | FT_GPR_U (6), FT_GPR_L (6), |
| 135 | FT_GPR_U (7), FT_GPR_L (7), |
| 136 | FT_GPR_U (8), FT_GPR_L (8), |
| 137 | FT_GPR_U (9), FT_GPR_L (9), |
| 138 | FT_GPR_U (10), FT_GPR_L (10), |
| 139 | FT_GPR_U (11), FT_GPR_L (11), |
| 140 | FT_GPR_U (12), FT_GPR_L (12), |
| 141 | FT_GPR_U (13), FT_GPR_L (13), |
| 142 | FT_GPR_U (14), FT_GPR_L (14), |
| 143 | FT_GPR_U (15), FT_GPR_L (15), |
| 144 | /* ACRs */ |
| 145 | FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3), |
| 146 | FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7), |
| 147 | FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11), |
| 148 | FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15), |
| 149 | /* FPRs (mapped to upper halves of 128-bit VR slots). */ |
| 150 | FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3), |
| 151 | FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7), |
| 152 | FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11), |
| 153 | FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15), |
| 154 | /* orig_r2, last_break, system_call */ |
| 155 | -1, -1, -1, |
| 156 | /* TDB */ |
| 157 | -1, -1, -1, -1, |
| 158 | -1, -1, -1, -1, |
| 159 | -1, -1, -1, -1, |
| 160 | -1, -1, -1, -1, |
| 161 | -1, -1, -1, -1, |
| 162 | /* Lower halves of 128-bit VRs. */ |
| 163 | FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3), |
| 164 | FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7), |
| 165 | FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11), |
| 166 | FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15), |
| 167 | /* And the next 16 VRs. */ |
| 168 | FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19), |
| 169 | FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23), |
| 170 | FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27), |
| 171 | FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31), |
| 172 | }; |
| 173 | |
| 174 | #else /* __s390x__ */ |
| 175 | |
| 176 | /* Used for s390x-linux64, s390x-linux64v1, s390x-linux64v2, s390x-vx-linux64. */ |
| 177 | |
| 178 | static const int s390x_ft_collect_regmap[] = { |
| 179 | /* 64-bit PSWA and PSWM. */ |
| 180 | FT_PSWM, FT_PSWA, |
| 181 | /* 64-bit GPRs. */ |
| 182 | FT_GPR (0), FT_GPR (1), FT_GPR (2), FT_GPR (3), |
| 183 | FT_GPR (4), FT_GPR (5), FT_GPR (6), FT_GPR (7), |
| 184 | FT_GPR (8), FT_GPR (9), FT_GPR (10), FT_GPR (11), |
| 185 | FT_GPR (12), FT_GPR (13), FT_GPR (14), FT_GPR (15), |
| 186 | /* ACRs */ |
| 187 | FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3), |
| 188 | FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7), |
| 189 | FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11), |
| 190 | FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15), |
| 191 | /* FPRs (mapped to upper halves of 128-bit VR slots). */ |
| 192 | FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3), |
| 193 | FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7), |
| 194 | FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11), |
| 195 | FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15), |
| 196 | /* orig_r2, last_break, system_call */ |
| 197 | -1, -1, -1, |
| 198 | /* Lower halves of 128-bit VRs. */ |
| 199 | FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3), |
| 200 | FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7), |
| 201 | FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11), |
| 202 | FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15), |
| 203 | /* And the next 16 VRs. */ |
| 204 | FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19), |
| 205 | FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23), |
| 206 | FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27), |
| 207 | FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31), |
| 208 | }; |
| 209 | |
| 210 | /* Used for s390x-te-linux64, s390x-tevx-linux64, and |
| 211 | s390x-gs-linux64. */ |
| 212 | |
| 213 | static const int s390x_te_ft_collect_regmap[] = { |
| 214 | /* 64-bit PSWA and PSWM. */ |
| 215 | FT_PSWM, FT_PSWA, |
| 216 | /* 64-bit GPRs. */ |
| 217 | FT_GPR (0), FT_GPR (1), FT_GPR (2), FT_GPR (3), |
| 218 | FT_GPR (4), FT_GPR (5), FT_GPR (6), FT_GPR (7), |
| 219 | FT_GPR (8), FT_GPR (9), FT_GPR (10), FT_GPR (11), |
| 220 | FT_GPR (12), FT_GPR (13), FT_GPR (14), FT_GPR (15), |
| 221 | /* ACRs */ |
| 222 | FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3), |
| 223 | FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7), |
| 224 | FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11), |
| 225 | FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15), |
| 226 | /* FPRs (mapped to upper halves of 128-bit VR slots). */ |
| 227 | FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3), |
| 228 | FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7), |
| 229 | FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11), |
| 230 | FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15), |
| 231 | /* orig_r2, last_break, system_call */ |
| 232 | -1, -1, -1, |
| 233 | /* TDB */ |
| 234 | -1, -1, -1, -1, |
| 235 | -1, -1, -1, -1, |
| 236 | -1, -1, -1, -1, |
| 237 | -1, -1, -1, -1, |
| 238 | -1, -1, -1, -1, |
| 239 | /* Lower halves of 128-bit VRs. */ |
| 240 | FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3), |
| 241 | FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7), |
| 242 | FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11), |
| 243 | FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15), |
| 244 | /* And the next 16 VRs. */ |
| 245 | FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19), |
| 246 | FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23), |
| 247 | FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27), |
| 248 | FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31), |
| 249 | }; |
| 250 | |
| 251 | #endif |
| 252 | |
| 253 | /* Initialized by get_ipa_tdesc according to the tdesc in use. */ |
| 254 | |
| 255 | static const int *s390_regmap; |
| 256 | static int s390_regnum; |
| 257 | |
| 258 | /* Fill in REGCACHE with registers saved by the jump pad in BUF. */ |
| 259 | |
| 260 | void |
| 261 | supply_fast_tracepoint_registers (struct regcache *regcache, |
| 262 | const unsigned char *buf) |
| 263 | { |
| 264 | int i; |
| 265 | for (i = 0; i < s390_regnum; i++) |
| 266 | if (s390_regmap[i] != -1) |
| 267 | supply_register (regcache, i, ((char *) buf) + s390_regmap[i]); |
| 268 | } |
| 269 | |
| 270 | ULONGEST |
| 271 | get_raw_reg (const unsigned char *raw_regs, int regnum) |
| 272 | { |
| 273 | int offset; |
| 274 | if (regnum >= s390_regnum) |
| 275 | return 0; |
| 276 | offset = s390_regmap[regnum]; |
| 277 | if (offset == -1) |
| 278 | return 0; |
| 279 | |
| 280 | /* The regnums are variable, better to figure out size by FT offset. */ |
| 281 | |
| 282 | /* 64-bit ones. */ |
| 283 | if (offset < FT_VR(16) |
| 284 | #ifdef __s390x__ |
| 285 | || (offset >= FT_GPR(0) && offset < FT_ACR(0)) |
| 286 | || offset == FT_PSWM |
| 287 | || offset == FT_PSWA |
| 288 | #endif |
| 289 | ) |
| 290 | return *(uint64_t *) (raw_regs + offset); |
| 291 | |
| 292 | if (offset >= FT_ACR(0 && offset < FT_PSWM) |
| 293 | || offset == FT_FPC |
| 294 | #ifndef __s390x__ |
| 295 | || (offset >= FT_GPR(0) && offset < FT_ACR(0)) |
| 296 | || offset == FT_PSWM_U |
| 297 | || offset == FT_PSWA_L |
| 298 | #endif |
| 299 | ) |
| 300 | return *(uint32_t *) (raw_regs + offset); |
| 301 | |
| 302 | /* This leaves 128-bit VX. No way to return them. */ |
| 303 | return 0; |
| 304 | } |
| 305 | |
| 306 | /* Return target_desc to use for IPA, given the tdesc index passed by |
| 307 | gdbserver. For s390, it also sets s390_regmap and s390_regnum. */ |
| 308 | |
| 309 | const struct target_desc * |
| 310 | get_ipa_tdesc (int idx) |
| 311 | { |
| 312 | #define SET_REGMAP(regmap, skip_last) \ |
| 313 | do { \ |
| 314 | s390_regmap = regmap; \ |
| 315 | s390_regnum = (sizeof regmap / sizeof regmap[0]) - skip_last; \ |
| 316 | } while(0) |
| 317 | switch (idx) |
| 318 | { |
| 319 | #ifdef __s390x__ |
| 320 | case S390_TDESC_64: |
| 321 | /* Subtract number of VX regs. */ |
| 322 | SET_REGMAP(s390x_ft_collect_regmap, 32); |
| 323 | return tdesc_s390x_linux64; |
| 324 | case S390_TDESC_64V1: |
| 325 | SET_REGMAP(s390x_ft_collect_regmap, 32); |
| 326 | return tdesc_s390x_linux64v1; |
| 327 | case S390_TDESC_64V2: |
| 328 | SET_REGMAP(s390x_ft_collect_regmap, 32); |
| 329 | return tdesc_s390x_linux64v2; |
| 330 | case S390_TDESC_TE: |
| 331 | SET_REGMAP(s390x_te_ft_collect_regmap, 32); |
| 332 | return tdesc_s390x_te_linux64; |
| 333 | case S390_TDESC_VX: |
| 334 | SET_REGMAP(s390x_ft_collect_regmap, 0); |
| 335 | return tdesc_s390x_vx_linux64; |
| 336 | case S390_TDESC_TEVX: |
| 337 | SET_REGMAP(s390x_te_ft_collect_regmap, 0); |
| 338 | return tdesc_s390x_tevx_linux64; |
| 339 | case S390_TDESC_GS: |
| 340 | SET_REGMAP(s390x_te_ft_collect_regmap, 0); |
| 341 | return tdesc_s390x_gs_linux64; |
| 342 | #else |
| 343 | case S390_TDESC_32: |
| 344 | SET_REGMAP(s390_linux32_ft_collect_regmap, 0); |
| 345 | return tdesc_s390_linux32; |
| 346 | case S390_TDESC_32V1: |
| 347 | SET_REGMAP(s390_linux32_ft_collect_regmap, 0); |
| 348 | return tdesc_s390_linux32v1; |
| 349 | case S390_TDESC_32V2: |
| 350 | SET_REGMAP(s390_linux32_ft_collect_regmap, 0); |
| 351 | return tdesc_s390_linux32v2; |
| 352 | case S390_TDESC_64: |
| 353 | SET_REGMAP(s390_linux64_ft_collect_regmap, 32); |
| 354 | return tdesc_s390_linux64; |
| 355 | case S390_TDESC_64V1: |
| 356 | SET_REGMAP(s390_linux64_ft_collect_regmap, 32); |
| 357 | return tdesc_s390_linux64v1; |
| 358 | case S390_TDESC_64V2: |
| 359 | SET_REGMAP(s390_linux64_ft_collect_regmap, 32); |
| 360 | return tdesc_s390_linux64v2; |
| 361 | case S390_TDESC_TE: |
| 362 | SET_REGMAP(s390_te_linux64_ft_collect_regmap, 32); |
| 363 | return tdesc_s390_te_linux64; |
| 364 | case S390_TDESC_VX: |
| 365 | SET_REGMAP(s390_linux64_ft_collect_regmap, 0); |
| 366 | return tdesc_s390_vx_linux64; |
| 367 | case S390_TDESC_TEVX: |
| 368 | SET_REGMAP(s390_te_linux64_ft_collect_regmap, 0); |
| 369 | return tdesc_s390_tevx_linux64; |
| 370 | case S390_TDESC_GS: |
| 371 | SET_REGMAP(s390_te_linux64_ft_collect_regmap, 0); |
| 372 | return tdesc_s390_gs_linux64; |
| 373 | #endif |
| 374 | default: |
| 375 | internal_error (__FILE__, __LINE__, |
| 376 | "unknown ipa tdesc index: %d", idx); |
| 377 | #ifdef __s390x__ |
| 378 | return tdesc_s390x_linux64; |
| 379 | #else |
| 380 | return tdesc_s390_linux32; |
| 381 | #endif |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | /* Allocate buffer for the jump pads. On 31-bit, JG reaches everywhere, |
| 386 | so just allocate normally. On 64-bit, we have +/-4GiB of reach, and |
| 387 | the executable is usually mapped at 0x80000000 - aim for somewhere |
| 388 | below it. */ |
| 389 | |
| 390 | void * |
| 391 | alloc_jump_pad_buffer (size_t size) |
| 392 | { |
| 393 | #ifdef __s390x__ |
| 394 | uintptr_t addr; |
| 395 | uintptr_t exec_base = getauxval (AT_PHDR); |
| 396 | int pagesize; |
| 397 | void *res; |
| 398 | |
| 399 | if (exec_base == 0) |
| 400 | exec_base = 0x80000000; |
| 401 | |
| 402 | pagesize = sysconf (_SC_PAGE_SIZE); |
| 403 | if (pagesize == -1) |
| 404 | perror_with_name ("sysconf"); |
| 405 | |
| 406 | addr = exec_base - size; |
| 407 | |
| 408 | /* size should already be page-aligned, but this can't hurt. */ |
| 409 | addr &= ~(pagesize - 1); |
| 410 | |
| 411 | /* Search for a free area. If we hit 0, we're out of luck. */ |
| 412 | for (; addr; addr -= pagesize) |
| 413 | { |
| 414 | /* No MAP_FIXED - we don't want to zap someone's mapping. */ |
| 415 | res = mmap ((void *) addr, size, |
| 416 | PROT_READ | PROT_WRITE | PROT_EXEC, |
| 417 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
| 418 | |
| 419 | /* If we got what we wanted, return. */ |
| 420 | if ((uintptr_t) res == addr) |
| 421 | return res; |
| 422 | |
| 423 | /* If we got a mapping, but at a wrong address, undo it. */ |
| 424 | if (res != MAP_FAILED) |
| 425 | munmap (res, size); |
| 426 | } |
| 427 | |
| 428 | return NULL; |
| 429 | #else |
| 430 | void *res = mmap (NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC, |
| 431 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
| 432 | |
| 433 | if (res == MAP_FAILED) |
| 434 | return NULL; |
| 435 | |
| 436 | return res; |
| 437 | #endif |
| 438 | } |
| 439 | |
| 440 | void |
| 441 | initialize_low_tracepoint (void) |
| 442 | { |
| 443 | #ifdef __s390x__ |
| 444 | init_registers_s390x_linux64 (); |
| 445 | init_registers_s390x_linux64v1 (); |
| 446 | init_registers_s390x_linux64v2 (); |
| 447 | init_registers_s390x_te_linux64 (); |
| 448 | init_registers_s390x_vx_linux64 (); |
| 449 | init_registers_s390x_tevx_linux64 (); |
| 450 | init_registers_s390x_gs_linux64 (); |
| 451 | #else |
| 452 | init_registers_s390_linux32 (); |
| 453 | init_registers_s390_linux32v1 (); |
| 454 | init_registers_s390_linux32v2 (); |
| 455 | init_registers_s390_linux64 (); |
| 456 | init_registers_s390_linux64v1 (); |
| 457 | init_registers_s390_linux64v2 (); |
| 458 | init_registers_s390_te_linux64 (); |
| 459 | init_registers_s390_vx_linux64 (); |
| 460 | init_registers_s390_tevx_linux64 (); |
| 461 | init_registers_s390_gs_linux64 (); |
| 462 | #endif |
| 463 | } |