1 /* Target-dependent code for GNU/Linux running on the Fujitsu FR-V,
4 Copyright (C) 2004-2024 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
30 #include "trad-frame.h"
31 #include "frame-unwind.h"
33 #include "linux-tdep.h"
36 /* Define the size (in bytes) of an FR-V instruction. */
37 static const int frv_instr_size
= 4;
45 frv_linux_pc_in_sigtramp (struct gdbarch
*gdbarch
, CORE_ADDR pc
,
48 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
49 gdb_byte buf
[frv_instr_size
];
53 if (target_read_memory (pc
, buf
, sizeof buf
) != 0)
56 instr
= extract_unsigned_integer (buf
, sizeof buf
, byte_order
);
58 if (instr
== 0x8efc0077) /* setlos #__NR_sigreturn, gr7 */
59 retval
= NORMAL_SIGTRAMP
;
60 else if (instr
== 0x8efc00ad) /* setlos #__NR_rt_sigreturn, gr7 */
65 if (target_read_memory (pc
+ frv_instr_size
, buf
, sizeof buf
) != 0)
67 instr
= extract_unsigned_integer (buf
, sizeof buf
, byte_order
);
68 if (instr
!= 0xc0700000) /* tira gr0, 0 */
71 /* If we get this far, we'll return a non-zero value, either
72 NORMAL_SIGTRAMP (1) or RT_SIGTRAMP (2). */
76 /* Given NEXT_FRAME, the "callee" frame of the sigtramp frame that we
77 wish to decode, and REGNO, one of the frv register numbers defined
78 in frv-tdep.h, return the address of the saved register (corresponding
79 to REGNO) in the sigtramp frame. Return -1 if the register is not
80 found in the sigtramp frame. The magic numbers in the code below
81 were computed by examining the following kernel structs:
83 From arch/frv/kernel/signal.c:
87 void (*pretcode)(void);
90 unsigned long extramask[_NSIG_WORDS-1];
96 void (*pretcode)(void);
98 struct siginfo *pinfo;
105 From include/asm-frv/ucontext.h:
108 unsigned long uc_flags;
109 struct ucontext *uc_link;
111 struct sigcontext uc_mcontext;
115 From include/asm-frv/signal.h:
117 typedef struct sigaltstack {
123 From include/asm-frv/sigcontext.h:
126 struct user_context sc_context;
127 unsigned long sc_oldmask;
128 } __attribute__((aligned(8)));
130 From include/asm-frv/registers.h:
140 unsigned long __status;
141 unsigned long syscallno;
142 unsigned long orig_gr8;
143 unsigned long gner[2];
144 unsigned long long iacc[1];
148 unsigned long gr[64];
152 struct user_fpmedia_regs
154 unsigned long fr[64];
155 unsigned long fner[2];
156 unsigned long msr[2];
157 unsigned long acc[8];
158 unsigned char accg[8];
159 unsigned long fsr[1];
164 struct user_int_regs i;
165 struct user_fpmedia_regs f;
168 } __attribute__((aligned(8))); */
171 frv_linux_sigcontext_reg_addr (const frame_info_ptr
&this_frame
, int regno
,
172 CORE_ADDR
*sc_addr_cache_ptr
)
174 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
175 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
178 if (sc_addr_cache_ptr
&& *sc_addr_cache_ptr
)
180 sc_addr
= *sc_addr_cache_ptr
;
188 pc
= get_frame_pc (this_frame
);
189 tramp_type
= frv_linux_pc_in_sigtramp (gdbarch
, pc
, 0);
191 get_frame_register (this_frame
, sp_regnum
, buf
);
192 sp
= extract_unsigned_integer (buf
, sizeof buf
, byte_order
);
194 if (tramp_type
== NORMAL_SIGTRAMP
)
196 /* For a normal sigtramp frame, the sigcontext struct starts
200 else if (tramp_type
== RT_SIGTRAMP
)
202 /* For a realtime sigtramp frame, SP + 12 contains a pointer
203 to a ucontext struct. The ucontext struct contains a
204 sigcontext struct starting 24 bytes in. (The offset of
205 uc_mcontext within struct ucontext is derived as follows:
206 stack_t is a 12-byte struct and struct sigcontext is
207 8-byte aligned. This gives an offset of 8 + 12 + 4 (for
209 if (target_read_memory (sp
+ 12, buf
, sizeof buf
) != 0)
211 warning (_("Can't read realtime sigtramp frame."));
214 sc_addr
= extract_unsigned_integer (buf
, sizeof buf
, byte_order
);
218 internal_error (_("not a signal trampoline"));
220 if (sc_addr_cache_ptr
)
221 *sc_addr_cache_ptr
= sc_addr
;
228 /* sc_addr + 4 has "isr", the Integer Status Register. */
239 /* sc_addr + 28 is __status, the exception status.
240 sc_addr + 32 is syscallno, the syscall number or -1.
241 sc_addr + 36 is orig_gr8, the original syscall arg #1.
242 sc_addr + 40 is gner[0].
243 sc_addr + 44 is gner[1]. */
249 if (first_gpr_regnum
<= regno
&& regno
<= last_gpr_regnum
)
250 return sc_addr
+ 56 + 4 * (regno
- first_gpr_regnum
);
251 else if (first_fpr_regnum
<= regno
&& regno
<= last_fpr_regnum
)
252 return sc_addr
+ 312 + 4 * (regno
- first_fpr_regnum
);
254 return -1; /* not saved. */
258 /* Signal trampolines. */
260 static struct trad_frame_cache
*
261 frv_linux_sigtramp_frame_cache (const frame_info_ptr
&this_frame
,
264 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
265 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
266 struct trad_frame_cache
*cache
;
270 CORE_ADDR sc_addr_cache_val
= 0;
271 struct frame_id this_id
;
274 return (struct trad_frame_cache
*) *this_cache
;
276 cache
= trad_frame_cache_zalloc (this_frame
);
278 /* FIXME: cagney/2004-05-01: This is is long standing broken code.
279 The frame ID's code address should be the start-address of the
280 signal trampoline and not the current PC within that
282 get_frame_register (this_frame
, sp_regnum
, buf
);
283 addr
= extract_unsigned_integer (buf
, sizeof buf
, byte_order
);
284 this_id
= frame_id_build (addr
, get_frame_pc (this_frame
));
285 trad_frame_set_id (cache
, this_id
);
287 for (regnum
= 0; regnum
< frv_num_regs
; regnum
++)
289 LONGEST reg_addr
= frv_linux_sigcontext_reg_addr (this_frame
, regnum
,
292 trad_frame_set_reg_addr (cache
, regnum
, reg_addr
);
300 frv_linux_sigtramp_frame_this_id (const frame_info_ptr
&this_frame
,
302 struct frame_id
*this_id
)
304 struct trad_frame_cache
*cache
305 = frv_linux_sigtramp_frame_cache (this_frame
, this_cache
);
306 trad_frame_get_id (cache
, this_id
);
309 static struct value
*
310 frv_linux_sigtramp_frame_prev_register (const frame_info_ptr
&this_frame
,
311 void **this_cache
, int regnum
)
313 /* Make sure we've initialized the cache. */
314 struct trad_frame_cache
*cache
315 = frv_linux_sigtramp_frame_cache (this_frame
, this_cache
);
316 return trad_frame_get_register (cache
, this_frame
, regnum
);
320 frv_linux_sigtramp_frame_sniffer (const struct frame_unwind
*self
,
321 const frame_info_ptr
&this_frame
,
324 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
325 CORE_ADDR pc
= get_frame_pc (this_frame
);
328 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
329 if (frv_linux_pc_in_sigtramp (gdbarch
, pc
, name
))
335 static const struct frame_unwind frv_linux_sigtramp_frame_unwind
=
337 "frv linux sigtramp",
339 default_frame_unwind_stop_reason
,
340 frv_linux_sigtramp_frame_this_id
,
341 frv_linux_sigtramp_frame_prev_register
,
343 frv_linux_sigtramp_frame_sniffer
346 /* The FRV kernel defines ELF_NGREG as 46. We add 2 in order to include
347 the loadmap addresses in the register set. (See below for more info.) */
348 #define FRV_ELF_NGREG (46 + 2)
349 typedef unsigned char frv_elf_greg_t
[4];
350 typedef struct { frv_elf_greg_t reg
[FRV_ELF_NGREG
]; } frv_elf_gregset_t
;
352 typedef unsigned char frv_elf_fpreg_t
[4];
355 frv_elf_fpreg_t fr
[64];
356 frv_elf_fpreg_t fner
[2];
357 frv_elf_fpreg_t msr
[2];
358 frv_elf_fpreg_t acc
[8];
359 unsigned char accg
[8];
360 frv_elf_fpreg_t fsr
[1];
361 } frv_elf_fpregset_t
;
365 static const struct regcache_map_entry frv_linux_gregmap
[] =
367 { 1, psr_regnum
, 4 },
368 { 1, REGCACHE_MAP_SKIP
, 4 }, /* isr */
369 { 1, ccr_regnum
, 4 },
370 { 1, cccr_regnum
, 4 },
372 { 1, lcr_regnum
, 4 },
374 { 1, REGCACHE_MAP_SKIP
, 4 }, /* __status */
375 { 1, REGCACHE_MAP_SKIP
, 4 }, /* syscallno */
376 { 1, REGCACHE_MAP_SKIP
, 4 }, /* orig_gr8 */
377 { 1, gner0_regnum
, 4 },
378 { 1, gner1_regnum
, 4 },
379 { 1, REGCACHE_MAP_SKIP
, 8 }, /* iacc0 */
380 { 1, tbr_regnum
, 4 },
381 { 31, first_gpr_regnum
+ 1, 4 }, /* gr1 ... gr31 */
383 /* Technically, the loadmap addresses are not part of `pr_reg' as
384 found in the elf_prstatus struct. The fields which communicate
385 the loadmap address appear (by design) immediately after
386 `pr_reg' though, and the BFD function elf32_frv_grok_prstatus()
387 has been implemented to include these fields in the register
388 section that it extracts from the core file. So, for our
389 purposes, they may be viewed as registers. */
391 { 1, fdpic_loadmap_exec_regnum
, 4 },
392 { 1, fdpic_loadmap_interp_regnum
, 4 },
396 static const struct regcache_map_entry frv_linux_fpregmap
[] =
398 { 64, first_fpr_regnum
, 4 }, /* fr0 ... fr63 */
399 { 1, fner0_regnum
, 4 },
400 { 1, fner1_regnum
, 4 },
401 { 1, msr0_regnum
, 4 },
402 { 1, msr1_regnum
, 4 },
403 { 8, acc0_regnum
, 4 }, /* acc0 ... acc7 */
404 { 1, accg0123_regnum
, 4 },
405 { 1, accg4567_regnum
, 4 },
406 { 1, fsr0_regnum
, 4 },
410 /* Unpack an frv_elf_gregset_t into GDB's register cache. */
413 frv_linux_supply_gregset (const struct regset
*regset
,
414 struct regcache
*regcache
,
415 int regnum
, const void *gregs
, size_t len
)
419 /* gr0 always contains 0. Also, the kernel passes the TBR value in
421 regcache
->raw_supply_zeroed (first_gpr_regnum
);
423 /* Fill gr32, ..., gr63 with zeros. */
424 for (regi
= first_gpr_regnum
+ 32; regi
<= last_gpr_regnum
; regi
++)
425 regcache
->raw_supply_zeroed (regi
);
427 regcache_supply_regset (regset
, regcache
, regnum
, gregs
, len
);
430 /* FRV Linux kernel register sets. */
432 static const struct regset frv_linux_gregset
=
435 frv_linux_supply_gregset
, regcache_collect_regset
438 static const struct regset frv_linux_fpregset
=
441 regcache_supply_regset
, regcache_collect_regset
445 frv_linux_iterate_over_regset_sections (struct gdbarch
*gdbarch
,
446 iterate_over_regset_sections_cb
*cb
,
448 const struct regcache
*regcache
)
450 cb (".reg", sizeof (frv_elf_gregset_t
), sizeof (frv_elf_gregset_t
),
451 &frv_linux_gregset
, NULL
, cb_data
);
452 cb (".reg2", sizeof (frv_elf_fpregset_t
), sizeof (frv_elf_fpregset_t
),
453 &frv_linux_fpregset
, NULL
, cb_data
);
458 frv_linux_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
460 linux_init_abi (info
, gdbarch
, 0);
462 /* Set the sigtramp frame sniffer. */
463 frame_unwind_append_unwinder (gdbarch
, &frv_linux_sigtramp_frame_unwind
);
465 set_gdbarch_iterate_over_regset_sections
466 (gdbarch
, frv_linux_iterate_over_regset_sections
);
469 static enum gdb_osabi
470 frv_linux_elf_osabi_sniffer (bfd
*abfd
)
474 elf_flags
= elf_elfheader (abfd
)->e_flags
;
476 /* Assume GNU/Linux if using the FDPIC ABI. If/when another OS shows
477 up that uses this ABI, we'll need to start using .note sections
479 if (elf_flags
& EF_FRV_FDPIC
)
480 return GDB_OSABI_LINUX
;
482 return GDB_OSABI_UNKNOWN
;
485 void _initialize_frv_linux_tdep ();
487 _initialize_frv_linux_tdep ()
489 gdbarch_register_osabi (bfd_arch_frv
, 0, GDB_OSABI_LINUX
,
491 gdbarch_register_osabi_sniffer (bfd_arch_frv
,
492 bfd_target_elf_flavour
,
493 frv_linux_elf_osabi_sniffer
);