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"
34 #include "ppc64-tdep.h"
35 #include "ppcfbsd-tdep.h"
36 #include "solib-svr4.h"
39 /* 32-bit regset descriptions. */
41 static const struct ppc_reg_offsets ppc32_fbsd_reg_offsets =
43 /* General-purpose registers. */
47 /* .pc_offset = */ 144,
48 /* .ps_offset = */ -1,
49 /* .cr_offset = */ 132,
50 /* .lr_offset = */ 128,
51 /* .ctr_offset = */ 140,
52 /* .xer_offset = */ 136,
53 /* .mq_offset = */ -1,
55 /* Floating-point registers. */
57 /* .fpscr_offset = */ 256,
58 /* .fpscr_size = */ 8,
60 /* AltiVec registers. */
61 /* .vr0_offset = */ 0,
62 /* .vscr_offset = */ 512 + 12,
63 /* .vrsave_offset = */ 512
67 /* 64-bit regset descriptions. */
69 static const struct ppc_reg_offsets ppc64_fbsd_reg_offsets =
71 /* General-purpose registers. */
75 /* .pc_offset = */ 288,
76 /* .ps_offset = */ -1,
77 /* .cr_offset = */ 264,
78 /* .lr_offset = */ 256,
79 /* .ctr_offset = */ 280,
80 /* .xer_offset = */ 272,
81 /* .mq_offset = */ -1,
83 /* Floating-point registers. */
85 /* .fpscr_offset = */ 256,
86 /* .fpscr_size = */ 8,
88 /* AltiVec registers. */
89 /* .vr0_offset = */ 0,
90 /* .vscr_offset = */ 512 + 12,
91 /* .vrsave_offset = */ 528
95 /* 32-bit general-purpose register set. */
97 static const struct regset ppc32_fbsd_gregset = {
98 &ppc32_fbsd_reg_offsets,
103 /* 64-bit general-purpose register set. */
105 static const struct regset ppc64_fbsd_gregset = {
106 &ppc64_fbsd_reg_offsets,
111 /* 32-/64-bit floating-point register set. */
113 static const struct regset ppc32_fbsd_fpregset = {
114 &ppc32_fbsd_reg_offsets,
119 const struct regset *
120 ppc_fbsd_gregset (int wordsize)
122 return wordsize == 8 ? &ppc64_fbsd_gregset : &ppc32_fbsd_gregset;
125 const struct regset *
126 ppc_fbsd_fpregset (void)
128 return &ppc32_fbsd_fpregset;
131 /* Return the appropriate register set for the core section identified
132 by SECT_NAME and SECT_SIZE. */
134 static const struct regset *
135 ppcfbsd_regset_from_core_section (struct gdbarch *gdbarch,
136 const char *sect_name, size_t sect_size)
138 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
139 if (strcmp (sect_name, ".reg") == 0 && sect_size >= 148)
141 if (tdep->wordsize == 4)
142 return &ppc32_fbsd_gregset;
144 return &ppc64_fbsd_gregset;
146 if (strcmp (sect_name, ".reg2") == 0 && sect_size >= 264)
147 return &ppc32_fbsd_fpregset;
151 /* Default page size. */
153 static const int ppcfbsd_page_size = 4096;
155 /* Offset for sigreturn(2). */
157 static const int ppcfbsd_sigreturn_offset[] = {
158 0xc, /* FreeBSD 32-bit */
162 /* Signal trampolines. */
165 ppcfbsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
166 struct frame_info *this_frame,
169 struct gdbarch *gdbarch = get_frame_arch (this_frame);
170 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
171 CORE_ADDR pc = get_frame_pc (this_frame);
172 CORE_ADDR start_pc = (pc & ~(ppcfbsd_page_size - 1));
176 /* A stack trampoline is detected if no name is associated
177 to the current pc and if it points inside a trampoline
180 find_pc_partial_function (pc, &name, NULL, NULL);
182 /* If we have a name, we have no trampoline, return. */
186 for (offset = ppcfbsd_sigreturn_offset; *offset != -1; offset++)
188 gdb_byte buf[2 * PPC_INSN_SIZE];
191 if (!safe_frame_unwind_memory (this_frame, start_pc + *offset,
195 /* Check for "li r0,SYS_sigreturn". */
196 insn = extract_unsigned_integer (buf, PPC_INSN_SIZE, byte_order);
197 if (insn != 0x380001a1)
200 /* Check for "sc". */
201 insn = extract_unsigned_integer (buf + PPC_INSN_SIZE,
202 PPC_INSN_SIZE, byte_order);
203 if (insn != 0x44000002)
212 static struct trad_frame_cache *
213 ppcfbsd_sigtramp_frame_cache (struct frame_info *this_frame, void **this_cache)
215 struct gdbarch *gdbarch = get_frame_arch (this_frame);
216 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
217 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
218 struct trad_frame_cache *cache;
219 CORE_ADDR addr, base, func;
220 gdb_byte buf[PPC_INSN_SIZE];
226 cache = trad_frame_cache_zalloc (this_frame);
229 func = get_frame_pc (this_frame);
230 func &= ~(ppcfbsd_page_size - 1);
231 if (!safe_frame_unwind_memory (this_frame, func, buf, sizeof buf))
234 base = get_frame_register_unsigned (this_frame, gdbarch_sp_regnum (gdbarch));
235 addr = base + 0x10 + 2 * tdep->wordsize;
236 for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize)
238 int regnum = i + tdep->ppc_gp0_regnum;
239 trad_frame_set_reg_addr (cache, regnum, addr);
241 trad_frame_set_reg_addr (cache, tdep->ppc_lr_regnum, addr);
242 addr += tdep->wordsize;
243 trad_frame_set_reg_addr (cache, tdep->ppc_cr_regnum, addr);
244 addr += tdep->wordsize;
245 trad_frame_set_reg_addr (cache, tdep->ppc_xer_regnum, addr);
246 addr += tdep->wordsize;
247 trad_frame_set_reg_addr (cache, tdep->ppc_ctr_regnum, addr);
248 addr += tdep->wordsize;
249 trad_frame_set_reg_addr (cache, gdbarch_pc_regnum (gdbarch), addr);
251 addr += tdep->wordsize;
253 /* Construct the frame ID using the function start. */
254 trad_frame_set_id (cache, frame_id_build (base, func));
260 ppcfbsd_sigtramp_frame_this_id (struct frame_info *this_frame,
261 void **this_cache, struct frame_id *this_id)
263 struct trad_frame_cache *cache =
264 ppcfbsd_sigtramp_frame_cache (this_frame, this_cache);
266 trad_frame_get_id (cache, this_id);
269 static struct value *
270 ppcfbsd_sigtramp_frame_prev_register (struct frame_info *this_frame,
271 void **this_cache, int regnum)
273 struct trad_frame_cache *cache =
274 ppcfbsd_sigtramp_frame_cache (this_frame, this_cache);
276 return trad_frame_get_register (cache, this_frame, regnum);
279 static const struct frame_unwind ppcfbsd_sigtramp_frame_unwind = {
281 default_frame_unwind_stop_reason,
282 ppcfbsd_sigtramp_frame_this_id,
283 ppcfbsd_sigtramp_frame_prev_register,
285 ppcfbsd_sigtramp_frame_sniffer
288 static enum return_value_convention
289 ppcfbsd_return_value (struct gdbarch *gdbarch, struct value *function,
290 struct type *valtype, struct regcache *regcache,
291 gdb_byte *readbuf, const gdb_byte *writebuf)
293 return ppc_sysv_abi_broken_return_value (gdbarch, function, valtype,
294 regcache, readbuf, writebuf);
299 ppcfbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
301 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
303 /* FreeBSD doesn't support the 128-bit `long double' from the psABI. */
304 set_gdbarch_long_double_bit (gdbarch, 64);
305 set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
307 if (tdep->wordsize == 4)
309 set_gdbarch_return_value (gdbarch, ppcfbsd_return_value);
311 set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
312 set_solib_svr4_fetch_link_map_offsets (gdbarch,
313 svr4_ilp32_fetch_link_map_offsets);
315 frame_unwind_append_unwinder (gdbarch, &ppcfbsd_sigtramp_frame_unwind);
316 set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpc");
319 if (tdep->wordsize == 8)
321 set_gdbarch_convert_from_func_ptr_addr
322 (gdbarch, ppc64_convert_from_func_ptr_addr);
323 set_gdbarch_elf_make_msymbol_special (gdbarch,
324 ppc64_elf_make_msymbol_special);
326 set_gdbarch_skip_trampoline_code (gdbarch, ppc64_skip_trampoline_code);
327 set_solib_svr4_fetch_link_map_offsets (gdbarch,
328 svr4_lp64_fetch_link_map_offsets);
329 set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpc");
332 set_gdbarch_regset_from_core_section
333 (gdbarch, ppcfbsd_regset_from_core_section);
335 set_gdbarch_fetch_tls_load_module_address (gdbarch,
336 svr4_fetch_objfile_link_map);
339 /* Provide a prototype to silence -Wmissing-prototypes. */
341 void _initialize_ppcfbsd_tdep (void);
344 _initialize_ppcfbsd_tdep (void)
346 gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc, GDB_OSABI_FREEBSD_ELF,
348 gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc64,
349 GDB_OSABI_FREEBSD_ELF,
351 gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_FREEBSD_ELF,