| 1 | /* Target-dependent code for FreeBSD/amd64. |
| 2 | |
| 3 | Copyright (C) 2003-2019 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 "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 "i386-fbsd-tdep.h" |
| 28 | #include "gdbsupport/x86-xstate.h" |
| 29 | |
| 30 | #include "amd64-tdep.h" |
| 31 | #include "fbsd-tdep.h" |
| 32 | #include "solib-svr4.h" |
| 33 | |
| 34 | /* Support for signal handlers. */ |
| 35 | |
| 36 | /* Return whether THIS_FRAME corresponds to a FreeBSD sigtramp |
| 37 | routine. */ |
| 38 | |
| 39 | static const gdb_byte amd64fbsd_sigtramp_code[] = |
| 40 | { |
| 41 | 0x48, 0x8d, 0x7c, 0x24, 0x10, /* lea SIGF_UC(%rsp),%rdi */ |
| 42 | 0x6a, 0x00, /* pushq $0 */ |
| 43 | 0x48, 0xc7, 0xc0, 0xa1, 0x01, 0x00, 0x00, |
| 44 | /* movq $SYS_sigreturn,%rax */ |
| 45 | 0x0f, 0x05 /* syscall */ |
| 46 | }; |
| 47 | |
| 48 | static int |
| 49 | amd64fbsd_sigtramp_p (struct frame_info *this_frame) |
| 50 | { |
| 51 | CORE_ADDR pc = get_frame_pc (this_frame); |
| 52 | gdb_byte buf[sizeof amd64fbsd_sigtramp_code]; |
| 53 | |
| 54 | if (!safe_frame_unwind_memory (this_frame, pc, buf, sizeof buf)) |
| 55 | return 0; |
| 56 | if (memcmp (buf, amd64fbsd_sigtramp_code, sizeof amd64fbsd_sigtramp_code) |
| 57 | != 0) |
| 58 | return 0; |
| 59 | |
| 60 | return 1; |
| 61 | } |
| 62 | |
| 63 | /* Assuming THIS_FRAME is for a BSD sigtramp routine, return the |
| 64 | address of the associated sigcontext structure. */ |
| 65 | |
| 66 | static CORE_ADDR |
| 67 | amd64fbsd_sigcontext_addr (struct frame_info *this_frame) |
| 68 | { |
| 69 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 70 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 71 | CORE_ADDR sp; |
| 72 | gdb_byte buf[8]; |
| 73 | |
| 74 | /* The `struct sigcontext' (which really is an `ucontext_t' on |
| 75 | FreeBSD/amd64) lives at a fixed offset in the signal frame. See |
| 76 | <machine/sigframe.h>. */ |
| 77 | get_frame_register (this_frame, AMD64_RSP_REGNUM, buf); |
| 78 | sp = extract_unsigned_integer (buf, 8, byte_order); |
| 79 | return sp + 16; |
| 80 | } |
| 81 | \f |
| 82 | /* FreeBSD 5.1-RELEASE or later. */ |
| 83 | |
| 84 | /* Mapping between the general-purpose registers in `struct reg' |
| 85 | format and GDB's register cache layout. |
| 86 | |
| 87 | Note that some registers are 32-bit, but since we're little-endian |
| 88 | we get away with that. */ |
| 89 | |
| 90 | /* From <machine/reg.h>. */ |
| 91 | static int amd64fbsd_r_reg_offset[] = |
| 92 | { |
| 93 | 14 * 8, /* %rax */ |
| 94 | 11 * 8, /* %rbx */ |
| 95 | 13 * 8, /* %rcx */ |
| 96 | 12 * 8, /* %rdx */ |
| 97 | 9 * 8, /* %rsi */ |
| 98 | 8 * 8, /* %rdi */ |
| 99 | 10 * 8, /* %rbp */ |
| 100 | 20 * 8, /* %rsp */ |
| 101 | 7 * 8, /* %r8 ... */ |
| 102 | 6 * 8, |
| 103 | 5 * 8, |
| 104 | 4 * 8, |
| 105 | 3 * 8, |
| 106 | 2 * 8, |
| 107 | 1 * 8, |
| 108 | 0 * 8, /* ... %r15 */ |
| 109 | 17 * 8, /* %rip */ |
| 110 | 19 * 8, /* %eflags */ |
| 111 | 18 * 8, /* %cs */ |
| 112 | 21 * 8, /* %ss */ |
| 113 | -1, /* %ds */ |
| 114 | -1, /* %es */ |
| 115 | -1, /* %fs */ |
| 116 | -1 /* %gs */ |
| 117 | }; |
| 118 | |
| 119 | /* Location of the signal trampoline. */ |
| 120 | CORE_ADDR amd64fbsd_sigtramp_start_addr; |
| 121 | CORE_ADDR amd64fbsd_sigtramp_end_addr; |
| 122 | |
| 123 | /* From <machine/signal.h>. */ |
| 124 | int amd64fbsd_sc_reg_offset[] = |
| 125 | { |
| 126 | 24 + 6 * 8, /* %rax */ |
| 127 | 24 + 7 * 8, /* %rbx */ |
| 128 | 24 + 3 * 8, /* %rcx */ |
| 129 | 24 + 2 * 8, /* %rdx */ |
| 130 | 24 + 1 * 8, /* %rsi */ |
| 131 | 24 + 0 * 8, /* %rdi */ |
| 132 | 24 + 8 * 8, /* %rbp */ |
| 133 | 24 + 22 * 8, /* %rsp */ |
| 134 | 24 + 4 * 8, /* %r8 ... */ |
| 135 | 24 + 5 * 8, |
| 136 | 24 + 9 * 8, |
| 137 | 24 + 10 * 8, |
| 138 | 24 + 11 * 8, |
| 139 | 24 + 12 * 8, |
| 140 | 24 + 13 * 8, |
| 141 | 24 + 14 * 8, /* ... %r15 */ |
| 142 | 24 + 19 * 8, /* %rip */ |
| 143 | 24 + 21 * 8, /* %eflags */ |
| 144 | 24 + 20 * 8, /* %cs */ |
| 145 | 24 + 23 * 8, /* %ss */ |
| 146 | -1, /* %ds */ |
| 147 | -1, /* %es */ |
| 148 | -1, /* %fs */ |
| 149 | -1 /* %gs */ |
| 150 | }; |
| 151 | |
| 152 | /* Implement the core_read_description gdbarch method. */ |
| 153 | |
| 154 | static const struct target_desc * |
| 155 | amd64fbsd_core_read_description (struct gdbarch *gdbarch, |
| 156 | struct target_ops *target, |
| 157 | bfd *abfd) |
| 158 | { |
| 159 | return amd64_target_description (i386fbsd_core_read_xcr0 (abfd), true); |
| 160 | } |
| 161 | |
| 162 | /* Similar to amd64_supply_fpregset, but use XSAVE extended state. */ |
| 163 | |
| 164 | static void |
| 165 | amd64fbsd_supply_xstateregset (const struct regset *regset, |
| 166 | struct regcache *regcache, int regnum, |
| 167 | const void *xstateregs, size_t len) |
| 168 | { |
| 169 | amd64_supply_xsave (regcache, regnum, xstateregs); |
| 170 | } |
| 171 | |
| 172 | /* Similar to amd64_collect_fpregset, but use XSAVE extended state. */ |
| 173 | |
| 174 | static void |
| 175 | amd64fbsd_collect_xstateregset (const struct regset *regset, |
| 176 | const struct regcache *regcache, |
| 177 | int regnum, void *xstateregs, size_t len) |
| 178 | { |
| 179 | amd64_collect_xsave (regcache, regnum, xstateregs, 1); |
| 180 | } |
| 181 | |
| 182 | static const struct regset amd64fbsd_xstateregset = |
| 183 | { |
| 184 | NULL, |
| 185 | amd64fbsd_supply_xstateregset, |
| 186 | amd64fbsd_collect_xstateregset |
| 187 | }; |
| 188 | |
| 189 | /* Iterate over core file register note sections. */ |
| 190 | |
| 191 | static void |
| 192 | amd64fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch, |
| 193 | iterate_over_regset_sections_cb *cb, |
| 194 | void *cb_data, |
| 195 | const struct regcache *regcache) |
| 196 | { |
| 197 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 198 | |
| 199 | cb (".reg", tdep->sizeof_gregset, tdep->sizeof_gregset, &i386_gregset, NULL, |
| 200 | cb_data); |
| 201 | cb (".reg2", tdep->sizeof_fpregset, tdep->sizeof_fpregset, &amd64_fpregset, |
| 202 | NULL, cb_data); |
| 203 | cb (".reg-xstate", X86_XSTATE_SIZE (tdep->xcr0), X86_XSTATE_SIZE (tdep->xcr0), |
| 204 | &amd64fbsd_xstateregset, "XSAVE extended state", cb_data); |
| 205 | } |
| 206 | |
| 207 | /* Implement the get_thread_local_address gdbarch method. */ |
| 208 | |
| 209 | static CORE_ADDR |
| 210 | amd64fbsd_get_thread_local_address (struct gdbarch *gdbarch, ptid_t ptid, |
| 211 | CORE_ADDR lm_addr, CORE_ADDR offset) |
| 212 | { |
| 213 | struct regcache *regcache; |
| 214 | |
| 215 | regcache = get_thread_arch_regcache (ptid, gdbarch); |
| 216 | |
| 217 | target_fetch_registers (regcache, AMD64_FSBASE_REGNUM); |
| 218 | |
| 219 | ULONGEST fsbase; |
| 220 | if (regcache->cooked_read (AMD64_FSBASE_REGNUM, &fsbase) != REG_VALID) |
| 221 | error (_("Unable to fetch %%fsbase")); |
| 222 | |
| 223 | CORE_ADDR dtv_addr = fsbase + gdbarch_ptr_bit (gdbarch) / 8; |
| 224 | return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset); |
| 225 | } |
| 226 | |
| 227 | static void |
| 228 | amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 229 | { |
| 230 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 231 | |
| 232 | /* Generic FreeBSD support. */ |
| 233 | fbsd_init_abi (info, gdbarch); |
| 234 | |
| 235 | /* Obviously FreeBSD is BSD-based. */ |
| 236 | i386bsd_init_abi (info, gdbarch); |
| 237 | |
| 238 | tdep->gregset_reg_offset = amd64fbsd_r_reg_offset; |
| 239 | tdep->gregset_num_regs = ARRAY_SIZE (amd64fbsd_r_reg_offset); |
| 240 | tdep->sizeof_gregset = 22 * 8; |
| 241 | |
| 242 | amd64_init_abi (info, gdbarch, |
| 243 | amd64_target_description (X86_XSTATE_SSE_MASK, true)); |
| 244 | |
| 245 | tdep->sigtramp_p = amd64fbsd_sigtramp_p; |
| 246 | tdep->sigtramp_start = amd64fbsd_sigtramp_start_addr; |
| 247 | tdep->sigtramp_end = amd64fbsd_sigtramp_end_addr; |
| 248 | tdep->sigcontext_addr = amd64fbsd_sigcontext_addr; |
| 249 | tdep->sc_reg_offset = amd64fbsd_sc_reg_offset; |
| 250 | tdep->sc_num_regs = ARRAY_SIZE (amd64fbsd_sc_reg_offset); |
| 251 | |
| 252 | tdep->xsave_xcr0_offset = I386_FBSD_XSAVE_XCR0_OFFSET; |
| 253 | |
| 254 | /* Iterate over core file register note sections. */ |
| 255 | set_gdbarch_iterate_over_regset_sections |
| 256 | (gdbarch, amd64fbsd_iterate_over_regset_sections); |
| 257 | |
| 258 | set_gdbarch_core_read_description (gdbarch, |
| 259 | amd64fbsd_core_read_description); |
| 260 | |
| 261 | /* FreeBSD uses SVR4-style shared libraries. */ |
| 262 | set_solib_svr4_fetch_link_map_offsets |
| 263 | (gdbarch, svr4_lp64_fetch_link_map_offsets); |
| 264 | |
| 265 | set_gdbarch_fetch_tls_load_module_address (gdbarch, |
| 266 | svr4_fetch_objfile_link_map); |
| 267 | set_gdbarch_get_thread_local_address (gdbarch, |
| 268 | amd64fbsd_get_thread_local_address); |
| 269 | } |
| 270 | |
| 271 | void |
| 272 | _initialize_amd64fbsd_tdep (void) |
| 273 | { |
| 274 | gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, |
| 275 | GDB_OSABI_FREEBSD, amd64fbsd_init_abi); |
| 276 | } |