1 /* Target-dependent code for FreeBSD/arm.
3 Copyright (C) 2017-2018 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/>. */
22 #include "elf/common.h"
24 #include "arm-fbsd-tdep.h"
26 #include "fbsd-tdep.h"
29 #include "solib-svr4.h"
30 #include "trad-frame.h"
31 #include "tramp-frame.h"
33 /* In a signal frame, sp points to a 'struct sigframe' which is
39 mcontext_vfp_t sf_vfp;
42 ucontext_t is defined as:
46 mcontext_t uc_mcontext;
50 mcontext_t is defined as:
53 unsigned int __gregs[17];
59 mcontext_vfp_t is defined as:
66 If the VFP state is valid, then mc_vfp_ptr will point to sf_vfp in
67 the sigframe, otherwise it is NULL. There is no non-VFP floating
68 point register state saved in the signal frame. */
70 #define ARM_MCONTEXT_REG_SIZE 4
71 #define ARM_MCONTEXT_VFP_REG_SIZE 8
72 #define ARM_SIGFRAME_UCONTEXT_OFFSET 64
73 #define ARM_UCONTEXT_MCONTEXT_OFFSET 16
74 #define ARM_MCONTEXT_VFP_PTR_OFFSET 72
76 /* Implement the "init" method of struct tramp_frame. */
79 arm_fbsd_sigframe_init (const struct tramp_frame
*self
,
80 struct frame_info
*this_frame
,
81 struct trad_frame_cache
*this_cache
,
84 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
85 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
86 CORE_ADDR sp
= get_frame_register_unsigned (this_frame
, ARM_SP_REGNUM
);
87 CORE_ADDR mcontext_addr
= (sp
88 + ARM_SIGFRAME_UCONTEXT_OFFSET
89 + ARM_UCONTEXT_MCONTEXT_OFFSET
);
90 ULONGEST mcontext_vfp_addr
;
92 for (int i
= 0; i
< 16; i
++)
94 trad_frame_set_reg_addr (this_cache
,
96 mcontext_addr
+ i
* ARM_MCONTEXT_REG_SIZE
);
98 trad_frame_set_reg_addr (this_cache
, ARM_PS_REGNUM
,
99 mcontext_addr
+ 16 * ARM_MCONTEXT_REG_SIZE
);
101 if (safe_read_memory_unsigned_integer (mcontext_addr
102 + ARM_MCONTEXT_VFP_PTR_OFFSET
, 4,
105 && mcontext_vfp_addr
!= 0)
107 for (int i
= 0; i
< 32; i
++)
109 trad_frame_set_reg_addr (this_cache
, ARM_D0_REGNUM
+ i
,
111 + i
* ARM_MCONTEXT_VFP_REG_SIZE
);
113 trad_frame_set_reg_addr (this_cache
, ARM_FPSCR_REGNUM
,
115 + 32 * ARM_MCONTEXT_VFP_REG_SIZE
);
118 trad_frame_set_id (this_cache
, frame_id_build (sp
, func
));
121 static const struct tramp_frame arm_fbsd_sigframe
=
126 {0xe1a0000d, -1}, /* mov r0, sp */
127 {0xe2800040, -1}, /* add r0, r0, #SIGF_UC */
128 {0xe59f700c, -1}, /* ldr r7, [pc, #12] */
129 {0xef0001a1, -1}, /* swi SYS_sigreturn */
130 {TRAMP_SENTINEL_INSN
, -1}
132 arm_fbsd_sigframe_init
137 static const struct regcache_map_entry arm_fbsd_gregmap
[] =
139 { 13, ARM_A1_REGNUM
, 4 }, /* r0 ... r12 */
140 { 1, ARM_SP_REGNUM
, 4 },
141 { 1, ARM_LR_REGNUM
, 4 },
142 { 1, ARM_PC_REGNUM
, 4 },
143 { 1, ARM_PS_REGNUM
, 4 },
147 static const struct regcache_map_entry arm_fbsd_vfpregmap
[] =
149 { 32, ARM_D0_REGNUM
, 8 }, /* d0 ... d31 */
150 { 1, ARM_FPSCR_REGNUM
, 4 },
154 /* Register set definitions. */
156 const struct regset arm_fbsd_gregset
=
159 regcache_supply_regset
, regcache_collect_regset
162 const struct regset arm_fbsd_vfpregset
=
165 regcache_supply_regset
, regcache_collect_regset
168 /* Implement the "regset_from_core_section" gdbarch method. */
171 arm_fbsd_iterate_over_regset_sections (struct gdbarch
*gdbarch
,
172 iterate_over_regset_sections_cb
*cb
,
174 const struct regcache
*regcache
)
176 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
178 cb (".reg", ARM_FBSD_SIZEOF_GREGSET
, &arm_fbsd_gregset
, NULL
, cb_data
);
180 /* While FreeBSD/arm cores do contain a NT_FPREGSET / ".reg2"
181 register set, it is not populated with register values by the
182 kernel but just contains all zeroes. */
183 if (tdep
->vfp_register_count
> 0)
184 cb (".reg-arm-vfp", ARM_FBSD_SIZEOF_VFPREGSET
, &arm_fbsd_vfpregset
,
185 "VFP floating-point", cb_data
);
188 /* Lookup a target description from a target's AT_HWCAP auxiliary
191 const struct target_desc
*
192 arm_fbsd_read_description_auxv (struct target_ops
*target
)
194 CORE_ADDR arm_hwcap
= 0;
196 if (target_auxv_search (target
, AT_FREEBSD_HWCAP
, &arm_hwcap
) != 1)
199 if (arm_hwcap
& HWCAP_VFP
)
201 if (arm_hwcap
& HWCAP_NEON
)
202 return tdesc_arm_with_neon
;
203 else if ((arm_hwcap
& (HWCAP_VFPv3
| HWCAP_VFPD32
))
204 == (HWCAP_VFPv3
| HWCAP_VFPD32
))
205 return tdesc_arm_with_vfpv3
;
207 return tdesc_arm_with_vfpv2
;
213 /* Implement the "core_read_description" gdbarch method. */
215 static const struct target_desc
*
216 arm_fbsd_core_read_description (struct gdbarch
*gdbarch
,
217 struct target_ops
*target
,
220 return arm_fbsd_read_description_auxv (target
);
223 /* Implement the 'init_osabi' method of struct gdb_osabi_handler. */
226 arm_fbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
228 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
230 /* Generic FreeBSD support. */
231 fbsd_init_abi (info
, gdbarch
);
233 if (tdep
->fp_model
== ARM_FLOAT_AUTO
)
234 tdep
->fp_model
= ARM_FLOAT_SOFT_VFP
;
236 tramp_frame_prepend_unwinder (gdbarch
, &arm_fbsd_sigframe
);
238 set_solib_svr4_fetch_link_map_offsets
239 (gdbarch
, svr4_ilp32_fetch_link_map_offsets
);
242 tdep
->jb_elt_size
= 4;
244 set_gdbarch_iterate_over_regset_sections
245 (gdbarch
, arm_fbsd_iterate_over_regset_sections
);
246 set_gdbarch_core_read_description (gdbarch
, arm_fbsd_core_read_description
);
248 /* Single stepping. */
249 set_gdbarch_software_single_step (gdbarch
, arm_software_single_step
);
253 _initialize_arm_fbsd_tdep (void)
255 gdbarch_register_osabi (bfd_arch_arm
, 0, GDB_OSABI_FREEBSD
,