| 1 | /* Target-dependent code for FreeBSD/amd64. |
| 2 | |
| 3 | Copyright (C) 2003-2016 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 "defs.h" |
| 21 | #include "arch-utils.h" |
| 22 | #include "frame.h" |
| 23 | #include "gdbcore.h" |
| 24 | #include "regcache.h" |
| 25 | #include "osabi.h" |
| 26 | #include "regset.h" |
| 27 | #include "i386fbsd-tdep.h" |
| 28 | #include "x86-xstate.h" |
| 29 | |
| 30 | #include "amd64-tdep.h" |
| 31 | #include "bsd-uthread.h" |
| 32 | #include "fbsd-tdep.h" |
| 33 | #include "solib-svr4.h" |
| 34 | |
| 35 | /* Support for signal handlers. */ |
| 36 | |
| 37 | /* Return whether THIS_FRAME corresponds to a FreeBSD sigtramp |
| 38 | routine. */ |
| 39 | |
| 40 | static const gdb_byte amd64fbsd_sigtramp_code[] = |
| 41 | { |
| 42 | 0x48, 0x8d, 0x7c, 0x24, 0x10, /* lea SIGF_UC(%rsp),%rdi */ |
| 43 | 0x6a, 0x00, /* pushq $0 */ |
| 44 | 0x48, 0xc7, 0xc0, 0xa1, 0x01, 0x00, 0x00, |
| 45 | /* movq $SYS_sigreturn,%rax */ |
| 46 | 0x0f, 0x05 /* syscall */ |
| 47 | }; |
| 48 | |
| 49 | static int |
| 50 | amd64fbsd_sigtramp_p (struct frame_info *this_frame) |
| 51 | { |
| 52 | CORE_ADDR pc = get_frame_pc (this_frame); |
| 53 | gdb_byte buf[sizeof amd64fbsd_sigtramp_code]; |
| 54 | |
| 55 | if (!safe_frame_unwind_memory (this_frame, pc, buf, sizeof buf)) |
| 56 | return 0; |
| 57 | if (memcmp (buf, amd64fbsd_sigtramp_code, sizeof amd64fbsd_sigtramp_code) |
| 58 | != 0) |
| 59 | return 0; |
| 60 | |
| 61 | return 1; |
| 62 | } |
| 63 | |
| 64 | /* Assuming THIS_FRAME is for a BSD sigtramp routine, return the |
| 65 | address of the associated sigcontext structure. */ |
| 66 | |
| 67 | static CORE_ADDR |
| 68 | amd64fbsd_sigcontext_addr (struct frame_info *this_frame) |
| 69 | { |
| 70 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 71 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 72 | CORE_ADDR sp; |
| 73 | gdb_byte buf[8]; |
| 74 | |
| 75 | /* The `struct sigcontext' (which really is an `ucontext_t' on |
| 76 | FreeBSD/amd64) lives at a fixed offset in the signal frame. See |
| 77 | <machine/sigframe.h>. */ |
| 78 | get_frame_register (this_frame, AMD64_RSP_REGNUM, buf); |
| 79 | sp = extract_unsigned_integer (buf, 8, byte_order); |
| 80 | return sp + 16; |
| 81 | } |
| 82 | \f |
| 83 | /* FreeBSD 5.1-RELEASE or later. */ |
| 84 | |
| 85 | /* Mapping between the general-purpose registers in `struct reg' |
| 86 | format and GDB's register cache layout. |
| 87 | |
| 88 | Note that some registers are 32-bit, but since we're little-endian |
| 89 | we get away with that. */ |
| 90 | |
| 91 | /* From <machine/reg.h>. */ |
| 92 | static int amd64fbsd_r_reg_offset[] = |
| 93 | { |
| 94 | 14 * 8, /* %rax */ |
| 95 | 11 * 8, /* %rbx */ |
| 96 | 13 * 8, /* %rcx */ |
| 97 | 12 * 8, /* %rdx */ |
| 98 | 9 * 8, /* %rsi */ |
| 99 | 8 * 8, /* %rdi */ |
| 100 | 10 * 8, /* %rbp */ |
| 101 | 20 * 8, /* %rsp */ |
| 102 | 7 * 8, /* %r8 ... */ |
| 103 | 6 * 8, |
| 104 | 5 * 8, |
| 105 | 4 * 8, |
| 106 | 3 * 8, |
| 107 | 2 * 8, |
| 108 | 1 * 8, |
| 109 | 0 * 8, /* ... %r15 */ |
| 110 | 17 * 8, /* %rip */ |
| 111 | 19 * 8, /* %eflags */ |
| 112 | 18 * 8, /* %cs */ |
| 113 | 21 * 8, /* %ss */ |
| 114 | -1, /* %ds */ |
| 115 | -1, /* %es */ |
| 116 | -1, /* %fs */ |
| 117 | -1 /* %gs */ |
| 118 | }; |
| 119 | |
| 120 | /* Location of the signal trampoline. */ |
| 121 | CORE_ADDR amd64fbsd_sigtramp_start_addr; |
| 122 | CORE_ADDR amd64fbsd_sigtramp_end_addr; |
| 123 | |
| 124 | /* From <machine/signal.h>. */ |
| 125 | int amd64fbsd_sc_reg_offset[] = |
| 126 | { |
| 127 | 24 + 6 * 8, /* %rax */ |
| 128 | 24 + 7 * 8, /* %rbx */ |
| 129 | 24 + 3 * 8, /* %rcx */ |
| 130 | 24 + 2 * 8, /* %rdx */ |
| 131 | 24 + 1 * 8, /* %rsi */ |
| 132 | 24 + 0 * 8, /* %rdi */ |
| 133 | 24 + 8 * 8, /* %rbp */ |
| 134 | 24 + 22 * 8, /* %rsp */ |
| 135 | 24 + 4 * 8, /* %r8 ... */ |
| 136 | 24 + 5 * 8, |
| 137 | 24 + 9 * 8, |
| 138 | 24 + 10 * 8, |
| 139 | 24 + 11 * 8, |
| 140 | 24 + 12 * 8, |
| 141 | 24 + 13 * 8, |
| 142 | 24 + 14 * 8, /* ... %r15 */ |
| 143 | 24 + 19 * 8, /* %rip */ |
| 144 | 24 + 21 * 8, /* %eflags */ |
| 145 | 24 + 20 * 8, /* %cs */ |
| 146 | 24 + 23 * 8, /* %ss */ |
| 147 | -1, /* %ds */ |
| 148 | -1, /* %es */ |
| 149 | -1, /* %fs */ |
| 150 | -1 /* %gs */ |
| 151 | }; |
| 152 | |
| 153 | /* From /usr/src/lib/libc/amd64/gen/_setjmp.S. */ |
| 154 | static int amd64fbsd_jmp_buf_reg_offset[] = |
| 155 | { |
| 156 | -1, /* %rax */ |
| 157 | 1 * 8, /* %rbx */ |
| 158 | -1, /* %rcx */ |
| 159 | -1, /* %rdx */ |
| 160 | -1, /* %rsi */ |
| 161 | -1, /* %rdi */ |
| 162 | 3 * 8, /* %rbp */ |
| 163 | 2 * 8, /* %rsp */ |
| 164 | -1, /* %r8 ... */ |
| 165 | -1, |
| 166 | -1, |
| 167 | -1, /* ... %r11 */ |
| 168 | 4 * 8, /* %r12 ... */ |
| 169 | 5 * 8, |
| 170 | 6 * 8, |
| 171 | 7 * 8, /* ... %r15 */ |
| 172 | 0 * 8 /* %rip */ |
| 173 | }; |
| 174 | |
| 175 | /* Implement the core_read_description gdbarch method. */ |
| 176 | |
| 177 | static const struct target_desc * |
| 178 | amd64fbsd_core_read_description (struct gdbarch *gdbarch, |
| 179 | struct target_ops *target, |
| 180 | bfd *abfd) |
| 181 | { |
| 182 | return amd64_target_description (i386fbsd_core_read_xcr0 (abfd)); |
| 183 | } |
| 184 | |
| 185 | /* Similar to amd64_supply_fpregset, but use XSAVE extended state. */ |
| 186 | |
| 187 | static void |
| 188 | amd64fbsd_supply_xstateregset (const struct regset *regset, |
| 189 | struct regcache *regcache, int regnum, |
| 190 | const void *xstateregs, size_t len) |
| 191 | { |
| 192 | amd64_supply_xsave (regcache, regnum, xstateregs); |
| 193 | } |
| 194 | |
| 195 | /* Similar to amd64_collect_fpregset, but use XSAVE extended state. */ |
| 196 | |
| 197 | static void |
| 198 | amd64fbsd_collect_xstateregset (const struct regset *regset, |
| 199 | const struct regcache *regcache, |
| 200 | int regnum, void *xstateregs, size_t len) |
| 201 | { |
| 202 | amd64_collect_xsave (regcache, regnum, xstateregs, 1); |
| 203 | } |
| 204 | |
| 205 | static const struct regset amd64fbsd_xstateregset = |
| 206 | { |
| 207 | NULL, |
| 208 | amd64fbsd_supply_xstateregset, |
| 209 | amd64fbsd_collect_xstateregset |
| 210 | }; |
| 211 | |
| 212 | /* Iterate over core file register note sections. */ |
| 213 | |
| 214 | static void |
| 215 | amd64fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch, |
| 216 | iterate_over_regset_sections_cb *cb, |
| 217 | void *cb_data, |
| 218 | const struct regcache *regcache) |
| 219 | { |
| 220 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 221 | |
| 222 | cb (".reg", tdep->sizeof_gregset, &i386_gregset, NULL, cb_data); |
| 223 | cb (".reg2", tdep->sizeof_fpregset, &amd64_fpregset, NULL, cb_data); |
| 224 | cb (".reg-xstate", X86_XSTATE_SIZE(tdep->xcr0), |
| 225 | &amd64fbsd_xstateregset, "XSAVE extended state", cb_data); |
| 226 | } |
| 227 | |
| 228 | static void |
| 229 | amd64fbsd_supply_uthread (struct regcache *regcache, |
| 230 | int regnum, CORE_ADDR addr) |
| 231 | { |
| 232 | gdb_byte buf[8]; |
| 233 | int i; |
| 234 | |
| 235 | gdb_assert (regnum >= -1); |
| 236 | |
| 237 | for (i = 0; i < ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset); i++) |
| 238 | { |
| 239 | if (amd64fbsd_jmp_buf_reg_offset[i] != -1 |
| 240 | && (regnum == -1 || regnum == i)) |
| 241 | { |
| 242 | read_memory (addr + amd64fbsd_jmp_buf_reg_offset[i], buf, 8); |
| 243 | regcache_raw_supply (regcache, i, buf); |
| 244 | } |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | static void |
| 249 | amd64fbsd_collect_uthread (const struct regcache *regcache, |
| 250 | int regnum, CORE_ADDR addr) |
| 251 | { |
| 252 | gdb_byte buf[8]; |
| 253 | int i; |
| 254 | |
| 255 | gdb_assert (regnum >= -1); |
| 256 | |
| 257 | for (i = 0; i < ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset); i++) |
| 258 | { |
| 259 | if (amd64fbsd_jmp_buf_reg_offset[i] != -1 |
| 260 | && (regnum == -1 || regnum == i)) |
| 261 | { |
| 262 | regcache_raw_collect (regcache, i, buf); |
| 263 | write_memory (addr + amd64fbsd_jmp_buf_reg_offset[i], buf, 8); |
| 264 | } |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | static void |
| 269 | amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 270 | { |
| 271 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 272 | |
| 273 | /* Generic FreeBSD support. */ |
| 274 | fbsd_init_abi (info, gdbarch); |
| 275 | |
| 276 | /* Obviously FreeBSD is BSD-based. */ |
| 277 | i386bsd_init_abi (info, gdbarch); |
| 278 | |
| 279 | tdep->gregset_reg_offset = amd64fbsd_r_reg_offset; |
| 280 | tdep->gregset_num_regs = ARRAY_SIZE (amd64fbsd_r_reg_offset); |
| 281 | tdep->sizeof_gregset = 22 * 8; |
| 282 | |
| 283 | amd64_init_abi (info, gdbarch); |
| 284 | |
| 285 | tdep->sigtramp_p = amd64fbsd_sigtramp_p; |
| 286 | tdep->sigtramp_start = amd64fbsd_sigtramp_start_addr; |
| 287 | tdep->sigtramp_end = amd64fbsd_sigtramp_end_addr; |
| 288 | tdep->sigcontext_addr = amd64fbsd_sigcontext_addr; |
| 289 | tdep->sc_reg_offset = amd64fbsd_sc_reg_offset; |
| 290 | tdep->sc_num_regs = ARRAY_SIZE (amd64fbsd_sc_reg_offset); |
| 291 | |
| 292 | tdep->xsave_xcr0_offset = I386_FBSD_XSAVE_XCR0_OFFSET; |
| 293 | |
| 294 | /* Iterate over core file register note sections. */ |
| 295 | set_gdbarch_iterate_over_regset_sections |
| 296 | (gdbarch, amd64fbsd_iterate_over_regset_sections); |
| 297 | |
| 298 | set_gdbarch_core_read_description (gdbarch, |
| 299 | amd64fbsd_core_read_description); |
| 300 | |
| 301 | /* FreeBSD provides a user-level threads implementation. */ |
| 302 | bsd_uthread_set_supply_uthread (gdbarch, amd64fbsd_supply_uthread); |
| 303 | bsd_uthread_set_collect_uthread (gdbarch, amd64fbsd_collect_uthread); |
| 304 | |
| 305 | /* FreeBSD uses SVR4-style shared libraries. */ |
| 306 | set_solib_svr4_fetch_link_map_offsets |
| 307 | (gdbarch, svr4_lp64_fetch_link_map_offsets); |
| 308 | } |
| 309 | \f |
| 310 | |
| 311 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 312 | void _initialize_amd64fbsd_tdep (void); |
| 313 | |
| 314 | void |
| 315 | _initialize_amd64fbsd_tdep (void) |
| 316 | { |
| 317 | gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, |
| 318 | GDB_OSABI_FREEBSD_ELF, amd64fbsd_init_abi); |
| 319 | } |