1 /* Motorola m68k native support for GNU/Linux.
3 Copyright (C) 1996, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
4 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/>. */
26 #include "gdb_string.h"
29 #include "linux-nat.h"
31 #include "m68k-tdep.h"
33 #include <sys/param.h>
36 #include <sys/ptrace.h>
38 #include <sys/ioctl.h>
40 #include <sys/procfs.h>
49 #include "floatformat.h"
53 /* Prototypes for supply_gregset etc. */
56 /* This table must line up with gdbarch_register_name in "m68k-tdep.c". */
57 static const int regmap[] =
59 PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7,
60 PT_A0, PT_A1, PT_A2, PT_A3, PT_A4, PT_A5, PT_A6, PT_USP,
62 /* PT_FP0, ..., PT_FP7 */
63 21, 24, 27, 30, 33, 36, 39, 42,
64 /* PT_FPCR, PT_FPSR, PT_FPIAR */
68 /* Which ptrace request retrieves which registers?
69 These apply to the corresponding SET requests as well. */
70 #define NUM_GREGS (18)
71 #define MAX_NUM_REGS (NUM_GREGS + 11)
74 getregs_supplies (int regno)
76 return 0 <= regno && regno < NUM_GREGS;
80 getfpregs_supplies (int regno)
82 return gdbarch_fp0_regnum (current_gdbarch) <= regno
83 && regno <= M68K_FPI_REGNUM;
86 /* Does the current host support the GETREGS request? */
87 int have_ptrace_getregs =
88 #ifdef HAVE_PTRACE_GETREGS
97 /* Fetching registers directly from the U area, one at a time. */
99 /* FIXME: This duplicates code from `inptrace.c'. The problem is that we
100 define FETCH_INFERIOR_REGISTERS since we want to use our own versions
101 of {fetch,store}_inferior_registers that use the GETREGS request. This
102 means that the code in `infptrace.c' is #ifdef'd out. But we need to
103 fall back on that code when GDB is running on top of a kernel that
104 doesn't support the GETREGS request. */
107 #define PT_READ_U PTRACE_PEEKUSR
110 #define PT_WRITE_U PTRACE_POKEUSR
113 /* Fetch one register. */
116 fetch_register (struct regcache *regcache, int regno)
118 /* This isn't really an address. But ptrace thinks of it as one. */
120 char mess[128]; /* For messages */
122 char buf[MAX_REGISTER_SIZE];
125 if (gdbarch_cannot_fetch_register (current_gdbarch, regno))
127 memset (buf, '\0', register_size (current_gdbarch, regno)); /* Supply zeroes */
128 regcache_raw_supply (regcache, regno, buf);
132 /* Overload thread id onto process id */
133 tid = TIDGET (inferior_ptid);
135 tid = PIDGET (inferior_ptid); /* no thread id, just use process id */
137 regaddr = 4 * regmap[regno];
138 for (i = 0; i < register_size (current_gdbarch, regno);
139 i += sizeof (PTRACE_TYPE_RET))
142 *(PTRACE_TYPE_RET *) &buf[i] = ptrace (PT_READ_U, tid,
143 (PTRACE_TYPE_ARG3) regaddr, 0);
144 regaddr += sizeof (PTRACE_TYPE_RET);
147 sprintf (mess, "reading register %s (#%d)",
148 gdbarch_register_name (current_gdbarch, regno), regno);
149 perror_with_name (mess);
152 regcache_raw_supply (regcache, regno, buf);
155 /* Fetch register values from the inferior.
156 If REGNO is negative, do this for all registers.
157 Otherwise, REGNO specifies which register (so we can save time). */
160 old_fetch_inferior_registers (struct regcache *regcache, int regno)
164 fetch_register (regcache, regno);
168 for (regno = 0; regno < gdbarch_num_regs (current_gdbarch); regno++)
170 fetch_register (regcache, regno);
175 /* Store one register. */
178 store_register (const struct regcache *regcache, int regno)
180 /* This isn't really an address. But ptrace thinks of it as one. */
182 char mess[128]; /* For messages */
185 char buf[MAX_REGISTER_SIZE];
187 if (gdbarch_cannot_store_register (current_gdbarch, regno))
190 /* Overload thread id onto process id */
191 tid = TIDGET (inferior_ptid);
193 tid = PIDGET (inferior_ptid); /* no thread id, just use process id */
195 regaddr = 4 * regmap[regno];
197 /* Put the contents of regno into a local buffer */
198 regcache_raw_collect (regcache, regno, buf);
200 /* Store the local buffer into the inferior a chunk at the time. */
201 for (i = 0; i < register_size (current_gdbarch, regno);
202 i += sizeof (PTRACE_TYPE_RET))
205 ptrace (PT_WRITE_U, tid, (PTRACE_TYPE_ARG3) regaddr,
206 *(PTRACE_TYPE_RET *) (buf + i));
207 regaddr += sizeof (PTRACE_TYPE_RET);
210 sprintf (mess, "writing register %s (#%d)",
211 gdbarch_register_name (current_gdbarch, regno), regno);
212 perror_with_name (mess);
217 /* Store our register values back into the inferior.
218 If REGNO is negative, do this for all registers.
219 Otherwise, REGNO specifies which register (so we can save time). */
222 old_store_inferior_registers (const struct regcache *regcache, int regno)
226 store_register (regcache, regno);
230 for (regno = 0; regno < gdbarch_num_regs (current_gdbarch); regno++)
232 store_register (regcache, regno);
237 /* Given a pointer to a general register set in /proc format
238 (elf_gregset_t *), unpack the register contents and supply
239 them as gdb's idea of the current register values. */
242 supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp)
244 const elf_greg_t *regp = (const elf_greg_t *) gregsetp;
247 for (regi = M68K_D0_REGNUM;
248 regi <= gdbarch_sp_regnum (current_gdbarch);
250 regcache_raw_supply (regcache, regi, ®p[regmap[regi]]);
251 regcache_raw_supply (regcache, gdbarch_ps_regnum (current_gdbarch),
253 regcache_raw_supply (regcache,
254 gdbarch_pc_regnum (current_gdbarch), ®p[PT_PC]);
257 /* Fill register REGNO (if it is a general-purpose register) in
258 *GREGSETPS with the value in GDB's register array. If REGNO is -1,
259 do this for all registers. */
261 fill_gregset (const struct regcache *regcache,
262 elf_gregset_t *gregsetp, int regno)
264 elf_greg_t *regp = (elf_greg_t *) gregsetp;
267 for (i = 0; i < NUM_GREGS; i++)
268 if (regno == -1 || regno == i)
269 regcache_raw_collect (regcache, i, regp + regmap[i]);
272 #ifdef HAVE_PTRACE_GETREGS
274 /* Fetch all general-purpose registers from process/thread TID and
275 store their values in GDB's register array. */
278 fetch_regs (struct regcache *regcache, int tid)
282 if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
286 /* The kernel we're running on doesn't support the GETREGS
287 request. Reset `have_ptrace_getregs'. */
288 have_ptrace_getregs = 0;
292 perror_with_name (_("Couldn't get registers"));
295 supply_gregset (regcache, (const elf_gregset_t *) ®s);
298 /* Store all valid general-purpose registers in GDB's register array
299 into the process/thread specified by TID. */
302 store_regs (const struct regcache *regcache, int tid, int regno)
306 if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
307 perror_with_name (_("Couldn't get registers"));
309 fill_gregset (regcache, ®s, regno);
311 if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0)
312 perror_with_name (_("Couldn't write registers"));
317 static void fetch_regs (struct regcache *regcache, int tid) {}
318 static void store_regs (const struct regcache *regcache, int tid, int regno) {}
323 /* Transfering floating-point registers between GDB, inferiors and cores. */
325 /* What is the address of fpN within the floating-point register set F? */
326 #define FPREG_ADDR(f, n) (&(f)->fpregs[(n) * 3])
328 /* Fill GDB's register array with the floating-point register values in
332 supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp)
336 for (regi = gdbarch_fp0_regnum (current_gdbarch);
337 regi < gdbarch_fp0_regnum (current_gdbarch) + 8; regi++)
338 regcache_raw_supply (regcache, regi,
339 FPREG_ADDR (fpregsetp,
340 regi - gdbarch_fp0_regnum
342 regcache_raw_supply (regcache, M68K_FPC_REGNUM, &fpregsetp->fpcntl[0]);
343 regcache_raw_supply (regcache, M68K_FPS_REGNUM, &fpregsetp->fpcntl[1]);
344 regcache_raw_supply (regcache, M68K_FPI_REGNUM, &fpregsetp->fpcntl[2]);
347 /* Fill register REGNO (if it is a floating-point register) in
348 *FPREGSETP with the value in GDB's register array. If REGNO is -1,
349 do this for all registers. */
352 fill_fpregset (const struct regcache *regcache,
353 elf_fpregset_t *fpregsetp, int regno)
357 /* Fill in the floating-point registers. */
358 for (i = gdbarch_fp0_regnum (current_gdbarch);
359 i < gdbarch_fp0_regnum (current_gdbarch) + 8; i++)
360 if (regno == -1 || regno == i)
361 regcache_raw_collect (regcache, i,
362 FPREG_ADDR (fpregsetp,
363 i - gdbarch_fp0_regnum
366 /* Fill in the floating-point control registers. */
367 for (i = M68K_FPC_REGNUM; i <= M68K_FPI_REGNUM; i++)
368 if (regno == -1 || regno == i)
369 regcache_raw_collect (regcache, i,
370 &fpregsetp->fpcntl[i - M68K_FPC_REGNUM]);
373 #ifdef HAVE_PTRACE_GETREGS
375 /* Fetch all floating-point registers from process/thread TID and store
376 thier values in GDB's register array. */
379 fetch_fpregs (struct regcache *regcache, int tid)
381 elf_fpregset_t fpregs;
383 if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
384 perror_with_name (_("Couldn't get floating point status"));
386 supply_fpregset (regcache, (const elf_fpregset_t *) &fpregs);
389 /* Store all valid floating-point registers in GDB's register array
390 into the process/thread specified by TID. */
393 store_fpregs (const struct regcache *regcache, int tid, int regno)
395 elf_fpregset_t fpregs;
397 if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
398 perror_with_name (_("Couldn't get floating point status"));
400 fill_fpregset (regcache, &fpregs, regno);
402 if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0)
403 perror_with_name (_("Couldn't write floating point status"));
408 static void fetch_fpregs (struct regcache *regcache, int tid) {}
409 static void store_fpregs (const struct regcache *regcache, int tid, int regno) {}
413 /* Transferring arbitrary registers between GDB and inferior. */
415 /* Fetch register REGNO from the child process. If REGNO is -1, do
416 this for all registers (including the floating point and SSE
420 m68k_linux_fetch_inferior_registers (struct regcache *regcache, int regno)
424 /* Use the old method of peeking around in `struct user' if the
425 GETREGS request isn't available. */
426 if (! have_ptrace_getregs)
428 old_fetch_inferior_registers (regcache, regno);
432 /* GNU/Linux LWP ID's are process ID's. */
433 tid = TIDGET (inferior_ptid);
435 tid = PIDGET (inferior_ptid); /* Not a threaded program. */
437 /* Use the PTRACE_GETFPXREGS request whenever possible, since it
438 transfers more registers in one system call, and we'll cache the
439 results. But remember that fetch_fpxregs can fail, and return
443 fetch_regs (regcache, tid);
445 /* The call above might reset `have_ptrace_getregs'. */
446 if (! have_ptrace_getregs)
448 old_fetch_inferior_registers (regcache, -1);
452 fetch_fpregs (regcache, tid);
456 if (getregs_supplies (regno))
458 fetch_regs (regcache, tid);
462 if (getfpregs_supplies (regno))
464 fetch_fpregs (regcache, tid);
468 internal_error (__FILE__, __LINE__,
469 _("Got request for bad register number %d."), regno);
472 /* Store register REGNO back into the child process. If REGNO is -1,
473 do this for all registers (including the floating point and SSE
476 m68k_linux_store_inferior_registers (struct regcache *regcache, int regno)
480 /* Use the old method of poking around in `struct user' if the
481 SETREGS request isn't available. */
482 if (! have_ptrace_getregs)
484 old_store_inferior_registers (regcache, regno);
488 /* GNU/Linux LWP ID's are process ID's. */
489 tid = TIDGET (inferior_ptid);
491 tid = PIDGET (inferior_ptid); /* Not a threaded program. */
493 /* Use the PTRACE_SETFPREGS requests whenever possible, since it
494 transfers more registers in one system call. But remember that
495 store_fpregs can fail, and return zero. */
498 store_regs (regcache, tid, regno);
499 store_fpregs (regcache, tid, regno);
503 if (getregs_supplies (regno))
505 store_regs (regcache, tid, regno);
509 if (getfpregs_supplies (regno))
511 store_fpregs (regcache, tid, regno);
515 internal_error (__FILE__, __LINE__,
516 _("Got request to store bad register number %d."), regno);
519 /* Interpreting register set info found in core files. */
521 /* Provide registers to GDB from a core file.
523 (We can't use the generic version of this function in
524 core-regset.c, because we need to use elf_gregset_t instead of
527 CORE_REG_SECT points to an array of bytes, which are the contents
528 of a `note' from a core file which BFD thinks might contain
529 register contents. CORE_REG_SIZE is its size.
531 WHICH says which register set corelow suspects this is:
532 0 --- the general-purpose register set, in elf_gregset_t format
533 2 --- the floating-point register set, in elf_fpregset_t format
535 REG_ADDR isn't used on GNU/Linux. */
538 fetch_core_registers (struct regcache *regcache,
539 char *core_reg_sect, unsigned core_reg_size,
540 int which, CORE_ADDR reg_addr)
542 elf_gregset_t gregset;
543 elf_fpregset_t fpregset;
548 if (core_reg_size != sizeof (gregset))
549 warning (_("Wrong size gregset in core file."));
552 memcpy (&gregset, core_reg_sect, sizeof (gregset));
553 supply_gregset (regcache, (const elf_gregset_t *) &gregset);
558 if (core_reg_size != sizeof (fpregset))
559 warning (_("Wrong size fpregset in core file."));
562 memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
563 supply_fpregset (regcache, (const elf_fpregset_t *) &fpregset);
568 /* We've covered all the kinds of registers we know about here,
569 so this must be something we wouldn't know what to do with
570 anyway. Just ignore it. */
576 /* Register that we are able to handle GNU/Linux ELF core file
579 static struct core_fns linux_elf_core_fns =
581 bfd_target_elf_flavour, /* core_flavour */
582 default_check_format, /* check_format */
583 default_core_sniffer, /* core_sniffer */
584 fetch_core_registers, /* core_read_registers */
588 void _initialize_m68k_linux_nat (void);
591 _initialize_m68k_linux_nat (void)
593 struct target_ops *t;
595 /* Fill in the generic GNU/Linux methods. */
598 /* Add our register access methods. */
599 t->to_fetch_registers = m68k_linux_fetch_inferior_registers;
600 t->to_store_registers = m68k_linux_store_inferior_registers;
602 /* Register the target. */
603 linux_nat_add_target (t);
605 deprecated_add_core_fns (&linux_elf_core_fns);