1 /* Target-dependent code for PowerPC systems running FreeBSD.
3 Copyright (C) 2013-2014 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"
24 #include "frame-unwind.h"
31 #include "trad-frame.h"
33 #include "gdb_assert.h"
37 #include "ppc64-tdep.h"
38 #include "ppcfbsd-tdep.h"
39 #include "solib-svr4.h"
42 /* 32-bit regset descriptions. */
44 static const struct ppc_reg_offsets ppc32_fbsd_reg_offsets
=
46 /* General-purpose registers. */
50 /* .pc_offset = */ 144,
51 /* .ps_offset = */ -1,
52 /* .cr_offset = */ 132,
53 /* .lr_offset = */ 128,
54 /* .ctr_offset = */ 140,
55 /* .xer_offset = */ 136,
56 /* .mq_offset = */ -1,
58 /* Floating-point registers. */
60 /* .fpscr_offset = */ 256,
61 /* .fpscr_size = */ 8,
63 /* AltiVec registers. */
64 /* .vr0_offset = */ 0,
65 /* .vscr_offset = */ 512 + 12,
66 /* .vrsave_offset = */ 512
70 /* 64-bit regset descriptions. */
72 static const struct ppc_reg_offsets ppc64_fbsd_reg_offsets
=
74 /* General-purpose registers. */
78 /* .pc_offset = */ 288,
79 /* .ps_offset = */ -1,
80 /* .cr_offset = */ 264,
81 /* .lr_offset = */ 256,
82 /* .ctr_offset = */ 280,
83 /* .xer_offset = */ 272,
84 /* .mq_offset = */ -1,
86 /* Floating-point registers. */
88 /* .fpscr_offset = */ 256,
89 /* .fpscr_size = */ 8,
91 /* AltiVec registers. */
92 /* .vr0_offset = */ 0,
93 /* .vscr_offset = */ 512 + 12,
94 /* .vrsave_offset = */ 528
98 /* 32-bit general-purpose register set. */
100 static const struct regset ppc32_fbsd_gregset
= {
101 &ppc32_fbsd_reg_offsets
,
106 /* 64-bit general-purpose register set. */
108 static const struct regset ppc64_fbsd_gregset
= {
109 &ppc64_fbsd_reg_offsets
,
114 /* 32-/64-bit floating-point register set. */
116 static const struct regset ppc32_fbsd_fpregset
= {
117 &ppc32_fbsd_reg_offsets
,
122 const struct regset
*
123 ppc_fbsd_gregset (int wordsize
)
125 return wordsize
== 8 ? &ppc64_fbsd_gregset
: &ppc32_fbsd_gregset
;
128 const struct regset
*
129 ppc_fbsd_fpregset (void)
131 return &ppc32_fbsd_fpregset
;
134 /* Return the appropriate register set for the core section identified
135 by SECT_NAME and SECT_SIZE. */
137 static const struct regset
*
138 ppcfbsd_regset_from_core_section (struct gdbarch
*gdbarch
,
139 const char *sect_name
, size_t sect_size
)
141 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
142 if (strcmp (sect_name
, ".reg") == 0 && sect_size
>= 148)
144 if (tdep
->wordsize
== 4)
145 return &ppc32_fbsd_gregset
;
147 return &ppc64_fbsd_gregset
;
149 if (strcmp (sect_name
, ".reg2") == 0 && sect_size
>= 264)
150 return &ppc32_fbsd_fpregset
;
154 /* Default page size. */
156 static const int ppcfbsd_page_size
= 4096;
158 /* Offset for sigreturn(2). */
160 static const int ppcfbsd_sigreturn_offset
[] = {
161 0xc, /* FreeBSD 32-bit */
165 /* Signal trampolines. */
168 ppcfbsd_sigtramp_frame_sniffer (const struct frame_unwind
*self
,
169 struct frame_info
*this_frame
,
172 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
173 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
174 CORE_ADDR pc
= get_frame_pc (this_frame
);
175 CORE_ADDR start_pc
= (pc
& ~(ppcfbsd_page_size
- 1));
179 /* A stack trampoline is detected if no name is associated
180 to the current pc and if it points inside a trampoline
183 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
185 /* If we have a name, we have no trampoline, return. */
189 for (offset
= ppcfbsd_sigreturn_offset
; *offset
!= -1; offset
++)
191 gdb_byte buf
[2 * PPC_INSN_SIZE
];
194 if (!safe_frame_unwind_memory (this_frame
, start_pc
+ *offset
,
198 /* Check for "li r0,SYS_sigreturn". */
199 insn
= extract_unsigned_integer (buf
, PPC_INSN_SIZE
, byte_order
);
200 if (insn
!= 0x380001a1)
203 /* Check for "sc". */
204 insn
= extract_unsigned_integer (buf
+ PPC_INSN_SIZE
,
205 PPC_INSN_SIZE
, byte_order
);
206 if (insn
!= 0x44000002)
215 static struct trad_frame_cache
*
216 ppcfbsd_sigtramp_frame_cache (struct frame_info
*this_frame
, void **this_cache
)
218 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
219 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
220 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
221 struct trad_frame_cache
*cache
;
222 CORE_ADDR addr
, base
, func
;
223 gdb_byte buf
[PPC_INSN_SIZE
];
229 cache
= trad_frame_cache_zalloc (this_frame
);
232 func
= get_frame_pc (this_frame
);
233 func
&= ~(ppcfbsd_page_size
- 1);
234 if (!safe_frame_unwind_memory (this_frame
, func
, buf
, sizeof buf
))
237 base
= get_frame_register_unsigned (this_frame
, gdbarch_sp_regnum (gdbarch
));
238 addr
= base
+ 0x10 + 2 * tdep
->wordsize
;
239 for (i
= 0; i
< ppc_num_gprs
; i
++, addr
+= tdep
->wordsize
)
241 int regnum
= i
+ tdep
->ppc_gp0_regnum
;
242 trad_frame_set_reg_addr (cache
, regnum
, addr
);
244 trad_frame_set_reg_addr (cache
, tdep
->ppc_lr_regnum
, addr
);
245 addr
+= tdep
->wordsize
;
246 trad_frame_set_reg_addr (cache
, tdep
->ppc_cr_regnum
, addr
);
247 addr
+= tdep
->wordsize
;
248 trad_frame_set_reg_addr (cache
, tdep
->ppc_xer_regnum
, addr
);
249 addr
+= tdep
->wordsize
;
250 trad_frame_set_reg_addr (cache
, tdep
->ppc_ctr_regnum
, addr
);
251 addr
+= tdep
->wordsize
;
252 trad_frame_set_reg_addr (cache
, gdbarch_pc_regnum (gdbarch
), addr
);
254 addr
+= tdep
->wordsize
;
256 /* Construct the frame ID using the function start. */
257 trad_frame_set_id (cache
, frame_id_build (base
, func
));
263 ppcfbsd_sigtramp_frame_this_id (struct frame_info
*this_frame
,
264 void **this_cache
, struct frame_id
*this_id
)
266 struct trad_frame_cache
*cache
=
267 ppcfbsd_sigtramp_frame_cache (this_frame
, this_cache
);
269 trad_frame_get_id (cache
, this_id
);
272 static struct value
*
273 ppcfbsd_sigtramp_frame_prev_register (struct frame_info
*this_frame
,
274 void **this_cache
, int regnum
)
276 struct trad_frame_cache
*cache
=
277 ppcfbsd_sigtramp_frame_cache (this_frame
, this_cache
);
279 return trad_frame_get_register (cache
, this_frame
, regnum
);
282 static const struct frame_unwind ppcfbsd_sigtramp_frame_unwind
= {
284 default_frame_unwind_stop_reason
,
285 ppcfbsd_sigtramp_frame_this_id
,
286 ppcfbsd_sigtramp_frame_prev_register
,
288 ppcfbsd_sigtramp_frame_sniffer
291 static enum return_value_convention
292 ppcfbsd_return_value (struct gdbarch
*gdbarch
, struct value
*function
,
293 struct type
*valtype
, struct regcache
*regcache
,
294 gdb_byte
*readbuf
, const gdb_byte
*writebuf
)
296 return ppc_sysv_abi_broken_return_value (gdbarch
, function
, valtype
,
297 regcache
, readbuf
, writebuf
);
302 ppcfbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
304 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
306 /* FreeBSD doesn't support the 128-bit `long double' from the psABI. */
307 set_gdbarch_long_double_bit (gdbarch
, 64);
308 set_gdbarch_long_double_format (gdbarch
, floatformats_ieee_double
);
310 if (tdep
->wordsize
== 4)
312 set_gdbarch_return_value (gdbarch
, ppcfbsd_return_value
);
314 set_gdbarch_skip_trampoline_code (gdbarch
, find_solib_trampoline_target
);
315 set_solib_svr4_fetch_link_map_offsets (gdbarch
,
316 svr4_ilp32_fetch_link_map_offsets
);
318 frame_unwind_append_unwinder (gdbarch
, &ppcfbsd_sigtramp_frame_unwind
);
319 set_gdbarch_gcore_bfd_target (gdbarch
, "elf32-powerpc");
322 if (tdep
->wordsize
== 8)
324 set_gdbarch_convert_from_func_ptr_addr
325 (gdbarch
, ppc64_convert_from_func_ptr_addr
);
326 set_gdbarch_elf_make_msymbol_special (gdbarch
,
327 ppc64_elf_make_msymbol_special
);
329 set_gdbarch_skip_trampoline_code (gdbarch
, ppc64_skip_trampoline_code
);
330 set_solib_svr4_fetch_link_map_offsets (gdbarch
,
331 svr4_lp64_fetch_link_map_offsets
);
332 set_gdbarch_gcore_bfd_target (gdbarch
, "elf64-powerpc");
335 set_gdbarch_regset_from_core_section
336 (gdbarch
, ppcfbsd_regset_from_core_section
);
338 set_gdbarch_fetch_tls_load_module_address (gdbarch
,
339 svr4_fetch_objfile_link_map
);
342 /* Provide a prototype to silence -Wmissing-prototypes. */
344 void _initialize_ppcfbsd_tdep (void);
347 _initialize_ppcfbsd_tdep (void)
349 gdbarch_register_osabi (bfd_arch_powerpc
, bfd_mach_ppc
, GDB_OSABI_FREEBSD_ELF
,
351 gdbarch_register_osabi (bfd_arch_powerpc
, bfd_mach_ppc64
,
352 GDB_OSABI_FREEBSD_ELF
,
354 gdbarch_register_osabi (bfd_arch_rs6000
, 0, GDB_OSABI_FREEBSD_ELF
,