1 /* Target-dependent code for PowerPC systems running FreeBSD.
3 Copyright (C) 2013 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
,
107 /* 64-bit general-purpose register set. */
109 static const struct regset ppc64_fbsd_gregset
= {
110 &ppc64_fbsd_reg_offsets
,
116 /* 32-/64-bit floating-point register set. */
118 static struct regset ppc32_fbsd_fpregset
= {
119 &ppc32_fbsd_reg_offsets
,
124 const struct regset
*
125 ppc_fbsd_gregset (int wordsize
)
127 return wordsize
== 8 ? &ppc64_fbsd_gregset
: &ppc32_fbsd_gregset
;
130 const struct regset
*
131 ppc_fbsd_fpregset (void)
133 return &ppc32_fbsd_fpregset
;
136 /* Return the appropriate register set for the core section identified
137 by SECT_NAME and SECT_SIZE. */
139 static const struct regset
*
140 ppcfbsd_regset_from_core_section (struct gdbarch
*gdbarch
,
141 const char *sect_name
, size_t sect_size
)
143 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
144 if (strcmp (sect_name
, ".reg") == 0 && sect_size
>= 148)
146 if (tdep
->wordsize
== 4)
147 return &ppc32_fbsd_gregset
;
149 return &ppc64_fbsd_gregset
;
151 if (strcmp (sect_name
, ".reg2") == 0 && sect_size
>= 264)
152 return &ppc32_fbsd_fpregset
;
156 /* Default page size. */
158 static const int ppcfbsd_page_size
= 4096;
160 /* Offset for sigreturn(2). */
162 static const int ppcfbsd_sigreturn_offset
[] = {
163 0xc, /* FreeBSD 32-bit */
167 /* Signal trampolines. */
170 ppcfbsd_sigtramp_frame_sniffer (const struct frame_unwind
*self
,
171 struct frame_info
*this_frame
,
174 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
175 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
176 CORE_ADDR pc
= get_frame_pc (this_frame
);
177 CORE_ADDR start_pc
= (pc
& ~(ppcfbsd_page_size
- 1));
181 /* A stack trampoline is detected if no name is associated
182 to the current pc and if it points inside a trampoline
185 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
187 /* If we have a name, we have no trampoline, return. */
191 for (offset
= ppcfbsd_sigreturn_offset
; *offset
!= -1; offset
++)
193 gdb_byte buf
[2 * PPC_INSN_SIZE
];
196 if (!safe_frame_unwind_memory (this_frame
, start_pc
+ *offset
,
200 /* Check for "li r0,SYS_sigreturn". */
201 insn
= extract_unsigned_integer (buf
, PPC_INSN_SIZE
, byte_order
);
202 if (insn
!= 0x380001a1)
205 /* Check for "sc". */
206 insn
= extract_unsigned_integer (buf
+ PPC_INSN_SIZE
,
207 PPC_INSN_SIZE
, byte_order
);
208 if (insn
!= 0x44000002)
217 static struct trad_frame_cache
*
218 ppcfbsd_sigtramp_frame_cache (struct frame_info
*this_frame
, void **this_cache
)
220 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
221 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
222 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
223 struct trad_frame_cache
*cache
;
224 CORE_ADDR addr
, base
, func
;
225 gdb_byte buf
[PPC_INSN_SIZE
];
231 cache
= trad_frame_cache_zalloc (this_frame
);
234 func
= get_frame_pc (this_frame
);
235 func
&= ~(ppcfbsd_page_size
- 1);
236 if (!safe_frame_unwind_memory (this_frame
, func
, buf
, sizeof buf
))
239 base
= get_frame_register_unsigned (this_frame
, gdbarch_sp_regnum (gdbarch
));
240 addr
= base
+ 0x10 + 2 * tdep
->wordsize
;
241 for (i
= 0; i
< ppc_num_gprs
; i
++, addr
+= tdep
->wordsize
)
243 int regnum
= i
+ tdep
->ppc_gp0_regnum
;
244 trad_frame_set_reg_addr (cache
, regnum
, addr
);
246 trad_frame_set_reg_addr (cache
, tdep
->ppc_lr_regnum
, addr
);
247 addr
+= tdep
->wordsize
;
248 trad_frame_set_reg_addr (cache
, tdep
->ppc_cr_regnum
, addr
);
249 addr
+= tdep
->wordsize
;
250 trad_frame_set_reg_addr (cache
, tdep
->ppc_xer_regnum
, addr
);
251 addr
+= tdep
->wordsize
;
252 trad_frame_set_reg_addr (cache
, tdep
->ppc_ctr_regnum
, addr
);
253 addr
+= tdep
->wordsize
;
254 trad_frame_set_reg_addr (cache
, gdbarch_pc_regnum (gdbarch
), addr
);
256 addr
+= tdep
->wordsize
;
258 /* Construct the frame ID using the function start. */
259 trad_frame_set_id (cache
, frame_id_build (base
, func
));
265 ppcfbsd_sigtramp_frame_this_id (struct frame_info
*this_frame
,
266 void **this_cache
, struct frame_id
*this_id
)
268 struct trad_frame_cache
*cache
=
269 ppcfbsd_sigtramp_frame_cache (this_frame
, this_cache
);
271 trad_frame_get_id (cache
, this_id
);
274 static struct value
*
275 ppcfbsd_sigtramp_frame_prev_register (struct frame_info
*this_frame
,
276 void **this_cache
, int regnum
)
278 struct trad_frame_cache
*cache
=
279 ppcfbsd_sigtramp_frame_cache (this_frame
, this_cache
);
281 return trad_frame_get_register (cache
, this_frame
, regnum
);
284 static const struct frame_unwind ppcfbsd_sigtramp_frame_unwind
= {
286 default_frame_unwind_stop_reason
,
287 ppcfbsd_sigtramp_frame_this_id
,
288 ppcfbsd_sigtramp_frame_prev_register
,
290 ppcfbsd_sigtramp_frame_sniffer
293 static enum return_value_convention
294 ppcfbsd_return_value (struct gdbarch
*gdbarch
, struct value
*function
,
295 struct type
*valtype
, struct regcache
*regcache
,
296 gdb_byte
*readbuf
, const gdb_byte
*writebuf
)
298 return ppc_sysv_abi_broken_return_value (gdbarch
, function
, valtype
,
299 regcache
, readbuf
, writebuf
);
304 ppcfbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
306 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
308 /* FreeBSD doesn't support the 128-bit `long double' from the psABI. */
309 set_gdbarch_long_double_bit (gdbarch
, 64);
310 set_gdbarch_long_double_format (gdbarch
, floatformats_ieee_double
);
312 if (tdep
->wordsize
== 4)
314 set_gdbarch_return_value (gdbarch
, ppcfbsd_return_value
);
316 set_gdbarch_skip_trampoline_code (gdbarch
, find_solib_trampoline_target
);
317 set_solib_svr4_fetch_link_map_offsets (gdbarch
,
318 svr4_ilp32_fetch_link_map_offsets
);
320 frame_unwind_append_unwinder (gdbarch
, &ppcfbsd_sigtramp_frame_unwind
);
321 set_gdbarch_gcore_bfd_target (gdbarch
, "elf32-powerpc");
324 if (tdep
->wordsize
== 8)
326 set_gdbarch_convert_from_func_ptr_addr
327 (gdbarch
, ppc64_convert_from_func_ptr_addr
);
328 set_gdbarch_elf_make_msymbol_special (gdbarch
,
329 ppc64_elf_make_msymbol_special
);
331 set_gdbarch_skip_trampoline_code (gdbarch
, ppc64_skip_trampoline_code
);
332 set_solib_svr4_fetch_link_map_offsets (gdbarch
,
333 svr4_lp64_fetch_link_map_offsets
);
334 set_gdbarch_gcore_bfd_target (gdbarch
, "elf64-powerpc");
337 set_gdbarch_regset_from_core_section
338 (gdbarch
, ppcfbsd_regset_from_core_section
);
340 set_gdbarch_fetch_tls_load_module_address (gdbarch
,
341 svr4_fetch_objfile_link_map
);
344 /* Provide a prototype to silence -Wmissing-prototypes. */
346 void _initialize_ppcfbsd_tdep (void);
349 _initialize_ppcfbsd_tdep (void)
351 gdbarch_register_osabi (bfd_arch_powerpc
, bfd_mach_ppc
, GDB_OSABI_FREEBSD_ELF
,
353 gdbarch_register_osabi (bfd_arch_powerpc
, bfd_mach_ppc64
,
354 GDB_OSABI_FREEBSD_ELF
,
356 gdbarch_register_osabi (bfd_arch_rs6000
, 0, GDB_OSABI_FREEBSD_ELF
,