GDB (xrefs)
/tmp/gdb-7.10/gdb/ppcfbsd-tdep.c
Go to the documentation of this file.
1 /* Target-dependent code for PowerPC systems running FreeBSD.
2 
3  Copyright (C) 2013-2015 Free Software Foundation, Inc.
4 
5  This file is part of GDB.
6 
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.
11 
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.
16 
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/>. */
19 
20 #include "defs.h"
21 #include "arch-utils.h"
22 #include "frame.h"
23 #include "gdbcore.h"
24 #include "frame-unwind.h"
25 #include "gdbtypes.h"
26 #include "osabi.h"
27 #include "regcache.h"
28 #include "regset.h"
29 #include "symtab.h"
30 #include "target.h"
31 #include "trad-frame.h"
32 
33 #include "ppc-tdep.h"
34 #include "ppc64-tdep.h"
35 #include "ppcfbsd-tdep.h"
36 #include "fbsd-tdep.h"
37 #include "solib-svr4.h"
38 
39 
40 /* 32-bit regset descriptions. */
41 
42 static const struct ppc_reg_offsets ppc32_fbsd_reg_offsets =
43  {
44  /* General-purpose registers. */
45  /* .r0_offset = */ 0,
46  /* .gpr_size = */ 4,
47  /* .xr_size = */ 4,
48  /* .pc_offset = */ 144,
49  /* .ps_offset = */ -1,
50  /* .cr_offset = */ 132,
51  /* .lr_offset = */ 128,
52  /* .ctr_offset = */ 140,
53  /* .xer_offset = */ 136,
54  /* .mq_offset = */ -1,
55 
56  /* Floating-point registers. */
57  /* .f0_offset = */ 0,
58  /* .fpscr_offset = */ 256,
59  /* .fpscr_size = */ 8,
60 #ifdef NOTYET
61  /* AltiVec registers. */
62  /* .vr0_offset = */ 0,
63  /* .vscr_offset = */ 512 + 12,
64  /* .vrsave_offset = */ 512
65 #endif
66  };
67 
68 /* 64-bit regset descriptions. */
69 
70 static const struct ppc_reg_offsets ppc64_fbsd_reg_offsets =
71  {
72  /* General-purpose registers. */
73  /* .r0_offset = */ 0,
74  /* .gpr_size = */ 8,
75  /* .xr_size = */ 8,
76  /* .pc_offset = */ 288,
77  /* .ps_offset = */ -1,
78  /* .cr_offset = */ 264,
79  /* .lr_offset = */ 256,
80  /* .ctr_offset = */ 280,
81  /* .xer_offset = */ 272,
82  /* .mq_offset = */ -1,
83 
84  /* Floating-point registers. */
85  /* .f0_offset = */ 0,
86  /* .fpscr_offset = */ 256,
87  /* .fpscr_size = */ 8,
88 #ifdef NOYET
89  /* AltiVec registers. */
90  /* .vr0_offset = */ 0,
91  /* .vscr_offset = */ 512 + 12,
92  /* .vrsave_offset = */ 528
93 #endif
94  };
95 
96 /* 32-bit general-purpose register set. */
97 
98 static const struct regset ppc32_fbsd_gregset = {
102 };
103 
104 /* 64-bit general-purpose register set. */
105 
106 static const struct regset ppc64_fbsd_gregset = {
110 };
111 
112 /* 32-/64-bit floating-point register set. */
113 
114 static const struct regset ppc32_fbsd_fpregset = {
118 };
119 
120 const struct regset *
122 {
123  return wordsize == 8 ? &ppc64_fbsd_gregset : &ppc32_fbsd_gregset;
124 }
125 
126 const struct regset *
128 {
129  return &ppc32_fbsd_fpregset;
130 }
131 
132 /* Iterate over core file register note sections. */
133 
134 static void
137  void *cb_data,
138  const struct regcache *regcache)
139 {
140  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
141 
142  if (tdep->wordsize == 4)
143  cb (".reg", 148, &ppc32_fbsd_gregset, NULL, cb_data);
144  else
145  cb (".reg", 296, &ppc64_fbsd_gregset, NULL, cb_data);
146  cb (".reg2", 264, &ppc32_fbsd_fpregset, NULL, cb_data);
147 }
148 
149 /* Default page size. */
150 
151 static const int ppcfbsd_page_size = 4096;
152 
153 /* Offset for sigreturn(2). */
154 
155 static const int ppcfbsd_sigreturn_offset[] = {
156  0xc, /* FreeBSD 32-bit */
157  -1
158 };
159 
160 /* Signal trampolines. */
161 
162 static int
164  struct frame_info *this_frame,
165  void **this_cache)
166 {
167  struct gdbarch *gdbarch = get_frame_arch (this_frame);
168  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
169  CORE_ADDR pc = get_frame_pc (this_frame);
170  CORE_ADDR start_pc = (pc & ~(ppcfbsd_page_size - 1));
171  const int *offset;
172  const char *name;
173 
174  /* A stack trampoline is detected if no name is associated
175  to the current pc and if it points inside a trampoline
176  sequence. */
177 
178  find_pc_partial_function (pc, &name, NULL, NULL);
179 
180  /* If we have a name, we have no trampoline, return. */
181  if (name)
182  return 0;
183 
184  for (offset = ppcfbsd_sigreturn_offset; *offset != -1; offset++)
185  {
186  gdb_byte buf[2 * PPC_INSN_SIZE];
187  unsigned long insn;
188 
189  if (!safe_frame_unwind_memory (this_frame, start_pc + *offset,
190  buf, sizeof buf))
191  continue;
192 
193  /* Check for "li r0,SYS_sigreturn". */
194  insn = extract_unsigned_integer (buf, PPC_INSN_SIZE, byte_order);
195  if (insn != 0x380001a1)
196  continue;
197 
198  /* Check for "sc". */
200  PPC_INSN_SIZE, byte_order);
201  if (insn != 0x44000002)
202  continue;
203 
204  return 1;
205  }
206 
207  return 0;
208 }
209 
210 static struct trad_frame_cache *
212 {
213  struct gdbarch *gdbarch = get_frame_arch (this_frame);
214  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
215  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
216  struct trad_frame_cache *cache;
217  CORE_ADDR addr, base, func;
218  gdb_byte buf[PPC_INSN_SIZE];
219  int i;
220 
221  if (*this_cache)
222  return *this_cache;
223 
224  cache = trad_frame_cache_zalloc (this_frame);
225  *this_cache = cache;
226 
227  func = get_frame_pc (this_frame);
228  func &= ~(ppcfbsd_page_size - 1);
229  if (!safe_frame_unwind_memory (this_frame, func, buf, sizeof buf))
230  return cache;
231 
232  base = get_frame_register_unsigned (this_frame, gdbarch_sp_regnum (gdbarch));
233  addr = base + 0x10 + 2 * tdep->wordsize;
234  for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize)
235  {
236  int regnum = i + tdep->ppc_gp0_regnum;
237  trad_frame_set_reg_addr (cache, regnum, addr);
238  }
239  trad_frame_set_reg_addr (cache, tdep->ppc_lr_regnum, addr);
240  addr += tdep->wordsize;
241  trad_frame_set_reg_addr (cache, tdep->ppc_cr_regnum, addr);
242  addr += tdep->wordsize;
243  trad_frame_set_reg_addr (cache, tdep->ppc_xer_regnum, addr);
244  addr += tdep->wordsize;
245  trad_frame_set_reg_addr (cache, tdep->ppc_ctr_regnum, addr);
246  addr += tdep->wordsize;
247  trad_frame_set_reg_addr (cache, gdbarch_pc_regnum (gdbarch), addr);
248  /* SRR0? */
249  addr += tdep->wordsize;
250 
251  /* Construct the frame ID using the function start. */
252  trad_frame_set_id (cache, frame_id_build (base, func));
253 
254  return cache;
255 }
256 
257 static void
259  void **this_cache, struct frame_id *this_id)
260 {
261  struct trad_frame_cache *cache =
262  ppcfbsd_sigtramp_frame_cache (this_frame, this_cache);
263 
264  trad_frame_get_id (cache, this_id);
265 }
266 
267 static struct value *
269  void **this_cache, int regnum)
270 {
271  struct trad_frame_cache *cache =
272  ppcfbsd_sigtramp_frame_cache (this_frame, this_cache);
273 
274  return trad_frame_get_register (cache, this_frame, regnum);
275 }
276 
277 static const struct frame_unwind ppcfbsd_sigtramp_frame_unwind = {
282  NULL,
284 };
285 
286 static enum return_value_convention
287 ppcfbsd_return_value (struct gdbarch *gdbarch, struct value *function,
288  struct type *valtype, struct regcache *regcache,
289  gdb_byte *readbuf, const gdb_byte *writebuf)
290 {
291  return ppc_sysv_abi_broken_return_value (gdbarch, function, valtype,
292  regcache, readbuf, writebuf);
293 }
294 
295 
296 static void
298 {
299  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
300 
301  /* Generic FreeBSD support. */
302  fbsd_init_abi (info, gdbarch);
303 
304  /* FreeBSD doesn't support the 128-bit `long double' from the psABI. */
305  set_gdbarch_long_double_bit (gdbarch, 64);
307 
308  if (tdep->wordsize == 4)
309  {
311 
315 
316  frame_unwind_append_unwinder (gdbarch, &ppcfbsd_sigtramp_frame_unwind);
317  set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpc");
318  }
319 
320  if (tdep->wordsize == 8)
321  {
326 
330  set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpc");
331  }
332 
335 
338 }
339 
340 /* Provide a prototype to silence -Wmissing-prototypes. */
341 
342 void _initialize_ppcfbsd_tdep (void);
343 
344 void
346 {
347  gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc, GDB_OSABI_FREEBSD_ELF,
349  gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc64,
352  gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_FREEBSD_ELF,
354 }
ULONGEST extract_unsigned_integer(const gdb_byte *, int, enum bfd_endian)
Definition: findvar.c:84
void trad_frame_set_reg_addr(struct trad_frame_cache *this_trad_cache, int regnum, CORE_ADDR addr)
Definition: trad-frame.c:119
struct frame_id frame_id_build(CORE_ADDR stack_addr, CORE_ADDR code_addr)
Definition: frame.c:554
enum return_value_convention ppc_sysv_abi_broken_return_value(struct gdbarch *gdbarch, struct value *function, struct type *valtype, struct regcache *regcache, gdb_byte *readbuf, const gdb_byte *writebuf)
CORE_ADDR get_frame_pc(struct frame_info *frame)
Definition: frame.c:2217
bfd_vma CORE_ADDR
Definition: common-types.h:41
void set_gdbarch_fetch_tls_load_module_address(struct gdbarch *gdbarch, gdbarch_fetch_tls_load_module_address_ftype fetch_tls_load_module_address)
Definition: gdbarch.c:2822
struct link_map_offsets * svr4_lp64_fetch_link_map_offsets(void)
Definition: solib-svr4.c:3180
const struct floatformat * floatformats_ieee_double[BFD_ENDIAN_UNKNOWN]
Definition: gdbtypes.c:74
int ppc_lr_regnum
Definition: ppc-tdep.h:218
void(* func)(char *)
void set_gdbarch_skip_trampoline_code(struct gdbarch *gdbarch, gdbarch_skip_trampoline_code_ftype skip_trampoline_code)
Definition: gdbarch.c:3084
void ppc_supply_fpregset(const struct regset *regset, struct regcache *regcache, int regnum, const void *fpregs, size_t len)
Definition: rs6000-tdep.c:550
void trad_frame_set_id(struct trad_frame_cache *this_trad_cache, struct frame_id this_id)
Definition: trad-frame.c:164
return_value_convention
Definition: defs.h:206
struct link_map_offsets * svr4_ilp32_fetch_link_map_offsets(void)
Definition: solib-svr4.c:3149
static const struct regset ppc32_fbsd_gregset
Definition: ppcfbsd-tdep.c:98
int ppc_cr_regnum
Definition: ppc-tdep.h:217
struct gdbarch_tdep * gdbarch_tdep(struct gdbarch *gdbarch)
Definition: gdbarch.c:1402
CORE_ADDR ppc64_skip_trampoline_code(struct frame_info *frame, CORE_ADDR pc)
Definition: ppc64-tdep.c:458
void frame_unwind_append_unwinder(struct gdbarch *gdbarch, const struct frame_unwind *unwinder)
Definition: frame-unwind.c:78
void set_gdbarch_elf_make_msymbol_special(struct gdbarch *gdbarch, gdbarch_elf_make_msymbol_special_ftype elf_make_msymbol_special)
Definition: gdbarch.c:3159
CORE_ADDR svr4_fetch_objfile_link_map(struct objfile *objfile)
Definition: solib-svr4.c:1573
Definition: regset.h:34
void trad_frame_get_id(struct trad_frame_cache *this_trad_cache, struct frame_id *this_id)
Definition: trad-frame.c:171
const char *const name
Definition: aarch64-tdep.c:68
void ppc_collect_gregset(const struct regset *regset, const struct regcache *regcache, int regnum, void *gregs, size_t len)
Definition: rs6000-tdep.c:663
const struct regset * ppc_fbsd_gregset(int wordsize)
Definition: ppcfbsd-tdep.c:121
static int ppcfbsd_sigtramp_frame_sniffer(const struct frame_unwind *self, struct frame_info *this_frame, void **this_cache)
Definition: ppcfbsd-tdep.c:163
int gdbarch_sp_regnum(struct gdbarch *gdbarch)
Definition: gdbarch.c:1981
CORE_ADDR find_solib_trampoline_target(struct frame_info *frame, CORE_ADDR pc)
Definition: minsyms.c:1394
int safe_frame_unwind_memory(struct frame_info *this_frame, CORE_ADDR addr, gdb_byte *buf, int len)
Definition: frame.c:2525
#define PPC_INSN_SIZE
Definition: ppc-tdep.h:327
int ppc_gp0_regnum
Definition: ppc-tdep.h:214
enum bfd_endian gdbarch_byte_order(struct gdbarch *gdbarch)
Definition: gdbarch.c:1420
static const struct ppc_reg_offsets ppc64_fbsd_reg_offsets
Definition: ppcfbsd-tdep.c:70
CORE_ADDR ppc64_convert_from_func_ptr_addr(struct gdbarch *gdbarch, CORE_ADDR addr, struct target_ops *targ)
Definition: ppc64-tdep.c:560
void set_solib_svr4_fetch_link_map_offsets(struct gdbarch *gdbarch, struct link_map_offsets *(*flmo)(void))
Definition: solib-svr4.c:3108
void set_gdbarch_gcore_bfd_target(struct gdbarch *gdbarch, const char *gcore_bfd_target)
Definition: gdbarch.c:3567
Definition: gdbtypes.h:749
int find_pc_partial_function(CORE_ADDR pc, const char **name, CORE_ADDR *address, CORE_ADDR *endaddr)
Definition: blockframe.c:321
void fbsd_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
Definition: fbsd-tdep.c:132
void ppc_collect_fpregset(const struct regset *regset, const struct regcache *regcache, int regnum, void *fpregs, size_t len)
Definition: rs6000-tdep.c:710
const struct regset * ppc_fbsd_fpregset(void)
Definition: ppcfbsd-tdep.c:127
struct trad_frame_cache * trad_frame_cache_zalloc(struct frame_info *this_frame)
Definition: trad-frame.c:36
static void ppcfbsd_sigtramp_frame_this_id(struct frame_info *this_frame, void **this_cache, struct frame_id *this_id)
Definition: ppcfbsd-tdep.c:258
void set_gdbarch_convert_from_func_ptr_addr(struct gdbarch *gdbarch, gdbarch_convert_from_func_ptr_addr_ftype convert_from_func_ptr_addr)
Definition: gdbarch.c:2985
int regnum
Definition: aarch64-tdep.c:69
void( iterate_over_regset_sections_cb)(const char *sect_name, int size, const struct regset *regset, const char *human_name, void *cb_data)
Definition: gdbarch.h:98
ULONGEST get_frame_register_unsigned(struct frame_info *frame, int regnum)
Definition: frame.c:1194
static void ppcfbsd_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
Definition: ppcfbsd-tdep.c:297
struct frame_info * this_frame
Definition: trad-frame.c:29
static void ppcfbsd_iterate_over_regset_sections(struct gdbarch *gdbarch, iterate_over_regset_sections_cb *cb, void *cb_data, const struct regcache *regcache)
Definition: ppcfbsd-tdep.c:135
void ppc64_elf_make_msymbol_special(asymbol *sym, struct minimal_symbol *msym)
Definition: ppc64-tdep.c:609
Definition: value.c:172
struct frame_id this_id
Definition: trad-frame.c:32
bfd_byte gdb_byte
Definition: common-types.h:38
int ppc_ctr_regnum
Definition: ppc-tdep.h:219
static struct trad_frame_cache * ppcfbsd_sigtramp_frame_cache(struct frame_info *this_frame, void **this_cache)
Definition: ppcfbsd-tdep.c:211
int wordsize
Definition: ppc-tdep.h:206
int offset
Definition: agent.c:65
static const struct ppc_reg_offsets ppc32_fbsd_reg_offsets
Definition: ppcfbsd-tdep.c:42
int ppc_xer_regnum
Definition: ppc-tdep.h:220
void _initialize_ppcfbsd_tdep(void)
Definition: ppcfbsd-tdep.c:345
enum unwind_stop_reason default_frame_unwind_stop_reason(struct frame_info *this_frame, void **this_cache)
Definition: frame-unwind.c:180
void set_gdbarch_long_double_bit(struct gdbarch *gdbarch, int long_double_bit)
Definition: gdbarch.c:1667
void set_gdbarch_return_value(struct gdbarch *gdbarch, gdbarch_return_value_ftype return_value)
Definition: gdbarch.c:2556
int gdbarch_pc_regnum(struct gdbarch *gdbarch)
Definition: gdbarch.c:1998
void set_gdbarch_long_double_format(struct gdbarch *gdbarch, const struct floatformat **long_double_format)
Definition: gdbarch.c:1683
static const int ppcfbsd_page_size
Definition: ppcfbsd-tdep.c:151
void set_gdbarch_iterate_over_regset_sections(struct gdbarch *gdbarch, gdbarch_iterate_over_regset_sections_ftype iterate_over_regset_sections)
Definition: gdbarch.c:3398
struct value * trad_frame_get_register(struct trad_frame_cache *this_trad_cache, struct frame_info *this_frame, int regnum)
Definition: trad-frame.c:155
enum bfd_endian byte_order
Definition: gdbarch.c:128
void gdbarch_register_osabi(enum bfd_architecture arch, unsigned long machine, enum gdb_osabi osabi, void(*init_osabi)(struct gdbarch_info, struct gdbarch *))
Definition: osabi.c:148
static const int ppcfbsd_sigreturn_offset[]
Definition: ppcfbsd-tdep.c:155
void ppc_supply_gregset(const struct regset *regset, struct regcache *regcache, int regnum, const void *gregs, size_t len)
Definition: rs6000-tdep.c:505
static const struct regset ppc32_fbsd_fpregset
Definition: ppcfbsd-tdep.c:114
struct gdbarch * get_frame_arch(struct frame_info *this_frame)
Definition: frame.c:2535
static struct value * ppcfbsd_sigtramp_frame_prev_register(struct frame_info *this_frame, void **this_cache, int regnum)
Definition: ppcfbsd-tdep.c:268
#define wordsize
static enum return_value_convention ppcfbsd_return_value(struct gdbarch *gdbarch, struct value *function, struct type *valtype, struct regcache *regcache, gdb_byte *readbuf, const gdb_byte *writebuf)
Definition: ppcfbsd-tdep.c:287