gdb/ppcfbsd-nat.c - gdb

Functions defined

Source code

  1. /* Native-dependent code for PowerPC's running FreeBSD, for GDB.

  3.    Copyright (C) 2013-2015 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/>.  */

  20. #include "defs.h"
  21. #include "gdbcore.h"
  22. #include "inferior.h"
  23. #include "regcache.h"

  25. #include <sys/types.h>
  26. #include <sys/procfs.h>
  27. #include <sys/ptrace.h>
  28. #include <sys/signal.h>
  29. #include <machine/frame.h>
  30. #include <machine/pcb.h>
  31. #include <machine/reg.h>

  33. #include "fbsd-nat.h"
  34. #include "gregset.h"
  35. #include "ppc-tdep.h"
  36. #include "ppcfbsd-tdep.h"
  37. #include "inf-ptrace.h"
  38. #include "bsd-kvm.h"

  40. /* Fill GDB's register array with the general-purpose register values
  41.    in *GREGSETP.  */

  43. void
  44. ‌supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
  45. {
  46.   const struct regset *regset = ppc_fbsd_gregset (sizeof (long));

  48.   ppc_supply_gregset (regset, regcache, -1, gregsetp, sizeof (*gregsetp));
  49. }

  51. /* Fill register REGNO (if a gpr) in *GREGSETP with the value in GDB's
  52.    register array. If REGNO is -1 do it for all registers.  */

  54. void
  55. ‌fill_gregset (const struct regcache *regcache,
  56.               gdb_gregset_t *gregsetp, int regno)
  57. {
  58.   const struct regset *regset = ppc_fbsd_gregset (sizeof (long));

  60.   if (regno == -1)
  61.     memset (gregsetp, 0, sizeof (*gregsetp));
  62.   ppc_collect_gregset (regset, regcache, regno, gregsetp, sizeof (*gregsetp));
  63. }

  65. /* Fill GDB's register array with the floating-point register values
  66.    in *FPREGSETP.  */

  68. void
  69. ‌supply_fpregset (struct regcache *regcache, const gdb_fpregset_t * fpregsetp)
  70. {
  71.   const struct regset *regset = ppc_fbsd_fpregset ();

  73.   ppc_supply_fpregset (regset, regcache, -1,
  74.                        fpregsetp, sizeof (*fpregsetp));
  75. }

  77. /* Fill register REGNO in *FGREGSETP with the value in GDB's
  78.    register array. If REGNO is -1 do it for all registers.  */

  80. void
  81. ‌fill_fpregset (const struct regcache *regcache,
  82.                gdb_fpregset_t *fpregsetp, int regno)
  83. {
  84.   const struct regset *regset = ppc_fbsd_fpregset ();

  86.   ppc_collect_fpregset (regset, regcache, regno,
  87.                         fpregsetp, sizeof (*fpregsetp));
  88. }

  90. /* Returns true if PT_GETFPREGS fetches this register.  */

  92. static int
  93. ‌getfpregs_supplies (struct gdbarch *gdbarch, int regno)
  94. {
  95.   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  97.   /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
  98.          point registers.  Traditionally, GDB's register set has still
  99.          listed the floating point registers for such machines, so this
  100.          code is harmless.  However, the new E500 port actually omits the
  101.          floating point registers entirely from the register set --- they
  102.          don't even have register numbers assigned to them.

  104.          It's not clear to me how best to update this code, so this assert
  105.          will alert the first person to encounter the NetBSD/E500
  106.          combination to the problem.  */

  108.   gdb_assert (ppc_floating_point_unit_p (gdbarch));

  110.   return ((regno >= tdep->ppc_fp0_regnum
  111.            && regno < tdep->ppc_fp0_regnum + ppc_num_fprs)
  112.           || regno == tdep->ppc_fpscr_regnum);
  113. }

  115. /* Fetch register REGNO from the child process. If REGNO is -1, do it
  116.    for all registers.  */

  118. static void
  119. ‌ppcfbsd_fetch_inferior_registers (struct target_ops *ops,
  120.                                   struct regcache *regcache, int regno)
  121. {
  122.   gdb_gregset_t regs;

  124.   if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid),
  125.               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  126.     perror_with_name (_("Couldn't get registers"));

  128.   supply_gregset (regcache, &regs);

  130.   if (regno == -1 || getfpregs_supplies (get_regcache_arch (regcache), regno))
  131.     {
  132.       const struct regset *fpregset = ppc_fbsd_fpregset ();
  133.       gdb_fpregset_t fpregs;

  135.       if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid),
  136.                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  137.         perror_with_name (_("Couldn't get FP registers"));

  139.       ppc_supply_fpregset (fpregset, regcache, regno, &fpregs, sizeof fpregs);
  140.     }
  141. }

  143. /* Store register REGNO back into the child process. If REGNO is -1,
  144.    do this for all registers.  */

  146. static void
  147. ‌ppcfbsd_store_inferior_registers (struct target_ops *ops,
  148.                                   struct regcache *regcache, int regno)
  149. {
  150.   gdb_gregset_t regs;

  152.   if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid),
  153.               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  154.     perror_with_name (_("Couldn't get registers"));

  156.   fill_gregset (regcache, &regs, regno);

  158.   if (ptrace (PT_SETREGS, ptid_get_pid (inferior_ptid),
  159.               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  160.     perror_with_name (_("Couldn't write registers"));

  162.   if (regno == -1 || getfpregs_supplies (get_regcache_arch (regcache), regno))
  163.     {
  164.       gdb_fpregset_t fpregs;

  166.       if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid),
  167.                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  168.         perror_with_name (_("Couldn't get FP registers"));

  170.       fill_fpregset (regcache, &fpregs, regno);

  172.       if (ptrace (PT_SETFPREGS, ptid_get_pid (inferior_ptid),
  173.                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  174.         perror_with_name (_("Couldn't set FP registers"));
  175.     }
  176. }

  178. /* Architecture specific function that reconstructs the
  179.    register state from PCB (Process Control Block) and supplies it
  180.    to REGCACHE.  */

  182. static int
  183. ‌ppcfbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
  184. {
  185.   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  186.   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  187.   int i, regnum;

  189.   /* The stack pointer shouldn't be zero.  */
  190.   if (pcb->pcb_sp == 0)
  191.     return 0;

  193.   regcache_raw_supply (regcache, gdbarch_sp_regnum (gdbarch), &pcb->pcb_sp);
  194.   regcache_raw_supply (regcache, tdep->ppc_cr_regnum, &pcb->pcb_cr);
  195.   regcache_raw_supply (regcache, tdep->ppc_lr_regnum, &pcb->pcb_lr);
  196.   for (i = 0, regnum = tdep->ppc_gp0_regnum + 14; i < 20; i++, regnum++)
  197.     regcache_raw_supply (regcache, regnum, &pcb->pcb_context[i]);

  199.   return 1;
  200. }

  202. /* Provide a prototype to silence -Wmissing-prototypes.  */

  204. void _initialize_ppcfbsd_nat (void);

  206. void
  207. ‌_initialize_ppcfbsd_nat (void)
  208. {
  209.   struct target_ops *t;

  211.   /* Add in local overrides.  */
  212.   t = inf_ptrace_target ();
  213.   t->to_fetch_registers = ppcfbsd_fetch_inferior_registers;
  214.   t->to_store_registers = ppcfbsd_store_inferior_registers;
  215.   t->to_pid_to_exec_file = fbsd_pid_to_exec_file;
  216.   t->to_find_memory_regions = fbsd_find_memory_regions;
  217.   add_target (t);

  219.   /* Support debugging kernel virtual memory images.  */
  220.   bsd_kvm_add_target (ppcfbsd_supply_pcb);
  221. }