1 /* Target-dependent code for FreeBSD/amd64.
3 Copyright (C) 2003-2022 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
21 #include "arch-utils.h"
27 #include "i386-fbsd-tdep.h"
28 #include "gdbsupport/x86-xstate.h"
30 #include "amd64-tdep.h"
31 #include "fbsd-tdep.h"
32 #include "solib-svr4.h"
35 /* Support for signal handlers. */
37 /* Return whether THIS_FRAME corresponds to a FreeBSD sigtramp
40 static const gdb_byte amd64fbsd_sigtramp_code
[] =
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 */
50 amd64fbsd_sigtramp_p (struct frame_info
*this_frame
)
52 CORE_ADDR pc
= get_frame_pc (this_frame
);
53 gdb_byte buf
[sizeof amd64fbsd_sigtramp_code
];
55 if (!safe_frame_unwind_memory (this_frame
, pc
, buf
))
57 if (memcmp (buf
, amd64fbsd_sigtramp_code
, sizeof amd64fbsd_sigtramp_code
)
64 /* Assuming THIS_FRAME is for a BSD sigtramp routine, return the
65 address of the associated sigcontext structure. */
68 amd64fbsd_sigcontext_addr (struct frame_info
*this_frame
)
70 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
71 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
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
);
83 /* FreeBSD 5.1-RELEASE or later. */
85 /* Mapping between the general-purpose registers in `struct reg'
86 format and GDB's register cache layout.
88 Note that some registers are 32-bit, but since we're little-endian
89 we get away with that. */
91 /* From <machine/reg.h>. */
92 static int amd64fbsd_r_reg_offset
[] =
109 0 * 8, /* ... %r15 */
111 19 * 8, /* %eflags */
120 /* From <machine/signal.h>. */
121 int amd64fbsd_sc_reg_offset
[] =
123 24 + 6 * 8, /* %rax */
124 24 + 7 * 8, /* %rbx */
125 24 + 3 * 8, /* %rcx */
126 24 + 2 * 8, /* %rdx */
127 24 + 1 * 8, /* %rsi */
128 24 + 0 * 8, /* %rdi */
129 24 + 8 * 8, /* %rbp */
130 24 + 22 * 8, /* %rsp */
131 24 + 4 * 8, /* %r8 ... */
138 24 + 14 * 8, /* ... %r15 */
139 24 + 19 * 8, /* %rip */
140 24 + 21 * 8, /* %eflags */
141 24 + 20 * 8, /* %cs */
142 24 + 23 * 8, /* %ss */
149 /* Implement the core_read_description gdbarch method. */
151 static const struct target_desc
*
152 amd64fbsd_core_read_description (struct gdbarch
*gdbarch
,
153 struct target_ops
*target
,
156 return amd64_target_description (i386fbsd_core_read_xcr0 (abfd
), true);
159 /* Similar to amd64_supply_fpregset, but use XSAVE extended state. */
162 amd64fbsd_supply_xstateregset (const struct regset
*regset
,
163 struct regcache
*regcache
, int regnum
,
164 const void *xstateregs
, size_t len
)
166 amd64_supply_xsave (regcache
, regnum
, xstateregs
);
169 /* Similar to amd64_collect_fpregset, but use XSAVE extended state. */
172 amd64fbsd_collect_xstateregset (const struct regset
*regset
,
173 const struct regcache
*regcache
,
174 int regnum
, void *xstateregs
, size_t len
)
176 amd64_collect_xsave (regcache
, regnum
, xstateregs
, 1);
179 static const struct regset amd64fbsd_xstateregset
=
182 amd64fbsd_supply_xstateregset
,
183 amd64fbsd_collect_xstateregset
186 /* Iterate over core file register note sections. */
189 amd64fbsd_iterate_over_regset_sections (struct gdbarch
*gdbarch
,
190 iterate_over_regset_sections_cb
*cb
,
192 const struct regcache
*regcache
)
194 i386_gdbarch_tdep
*tdep
= (i386_gdbarch_tdep
*) gdbarch_tdep (gdbarch
);
196 cb (".reg", tdep
->sizeof_gregset
, tdep
->sizeof_gregset
, &i386_gregset
, NULL
,
198 cb (".reg2", tdep
->sizeof_fpregset
, tdep
->sizeof_fpregset
, &amd64_fpregset
,
200 cb (".reg-xstate", X86_XSTATE_SIZE (tdep
->xcr0
), X86_XSTATE_SIZE (tdep
->xcr0
),
201 &amd64fbsd_xstateregset
, "XSAVE extended state", cb_data
);
204 /* Implement the get_thread_local_address gdbarch method. */
207 amd64fbsd_get_thread_local_address (struct gdbarch
*gdbarch
, ptid_t ptid
,
208 CORE_ADDR lm_addr
, CORE_ADDR offset
)
210 struct regcache
*regcache
;
212 regcache
= get_thread_arch_regcache (current_inferior ()->process_target (),
215 target_fetch_registers (regcache
, AMD64_FSBASE_REGNUM
);
218 if (regcache
->cooked_read (AMD64_FSBASE_REGNUM
, &fsbase
) != REG_VALID
)
219 error (_("Unable to fetch %%fsbase"));
221 CORE_ADDR dtv_addr
= fsbase
+ gdbarch_ptr_bit (gdbarch
) / 8;
222 return fbsd_get_thread_local_address (gdbarch
, dtv_addr
, lm_addr
, offset
);
226 amd64fbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
228 i386_gdbarch_tdep
*tdep
= (i386_gdbarch_tdep
*) gdbarch_tdep (gdbarch
);
230 /* Generic FreeBSD support. */
231 fbsd_init_abi (info
, gdbarch
);
233 /* Obviously FreeBSD is BSD-based. */
234 i386bsd_init_abi (info
, gdbarch
);
236 tdep
->gregset_reg_offset
= amd64fbsd_r_reg_offset
;
237 tdep
->gregset_num_regs
= ARRAY_SIZE (amd64fbsd_r_reg_offset
);
238 tdep
->sizeof_gregset
= 22 * 8;
240 amd64_init_abi (info
, gdbarch
,
241 amd64_target_description (X86_XSTATE_SSE_MASK
, true));
243 tdep
->sigtramp_p
= amd64fbsd_sigtramp_p
;
244 tdep
->sigcontext_addr
= amd64fbsd_sigcontext_addr
;
245 tdep
->sc_reg_offset
= amd64fbsd_sc_reg_offset
;
246 tdep
->sc_num_regs
= ARRAY_SIZE (amd64fbsd_sc_reg_offset
);
248 tdep
->xsave_xcr0_offset
= I386_FBSD_XSAVE_XCR0_OFFSET
;
250 /* Iterate over core file register note sections. */
251 set_gdbarch_iterate_over_regset_sections
252 (gdbarch
, amd64fbsd_iterate_over_regset_sections
);
254 set_gdbarch_core_read_description (gdbarch
,
255 amd64fbsd_core_read_description
);
257 /* FreeBSD uses SVR4-style shared libraries. */
258 set_solib_svr4_fetch_link_map_offsets
259 (gdbarch
, svr4_lp64_fetch_link_map_offsets
);
261 set_gdbarch_fetch_tls_load_module_address (gdbarch
,
262 svr4_fetch_objfile_link_map
);
263 set_gdbarch_get_thread_local_address (gdbarch
,
264 amd64fbsd_get_thread_local_address
);
267 void _initialize_amd64fbsd_tdep ();
269 _initialize_amd64fbsd_tdep ()
271 gdbarch_register_osabi (bfd_arch_i386
, bfd_mach_x86_64
,
272 GDB_OSABI_FREEBSD
, amd64fbsd_init_abi
);