gdb/vaxbsd-nat.c - gdb

Functions defined

Source code

  1. /* Native-dependent code for modern VAX BSD's.

  3.    Copyright (C) 2004-2015 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 "inferior.h"
  22. #include "regcache.h"
  23. #include "target.h"

  25. #include <sys/types.h>
  26. #include <sys/ptrace.h>
  27. #include <machine/reg.h>

  29. #include "vax-tdep.h"
  30. #include "inf-ptrace.h"

  32. /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */

  34. static void
  35. ‌vaxbsd_supply_gregset (struct regcache *regcache, const void *gregs)
  36. {
  37.   const gdb_byte *regs = gregs;
  38.   int regnum;

  40.   for (regnum = 0; regnum < VAX_NUM_REGS; regnum++)
  41.     regcache_raw_supply (regcache, regnum, regs + regnum * 4);
  42. }

  44. /* Collect the general-purpose registers from REGCACHE and store them
  45.    in GREGS.  */

  47. static void
  48. ‌vaxbsd_collect_gregset (const struct regcache *regcache,
  49.                         void *gregs, int regnum)
  50. {
  51.   gdb_byte *regs = gregs;
  52.   int i;

  54.   for (i = 0; i <= VAX_NUM_REGS; i++)
  55.     {
  56.       if (regnum == -1 || regnum == i)
  57.         regcache_raw_collect (regcache, i, regs + i * 4);
  58.     }
  59. }


  62. /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  63.    for all registers.  */

  65. static void
  66. ‌vaxbsd_fetch_inferior_registers (struct target_ops *ops,
  67.                                  struct regcache *regcache, int regnum)
  68. {
  69.   struct reg regs;

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

  75.   vaxbsd_supply_gregset (regcache, &regs);
  76. }

  78. /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  79.    this for all registers.  */

  81. static void
  82. ‌vaxbsd_store_inferior_registers (struct target_ops *ops,
  83.                                  struct regcache *regcache, int regnum)
  84. {
  85.   struct reg regs;

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

  91.   vaxbsd_collect_gregset (regcache, &regs, regnum);

  93.   if (ptrace (PT_SETREGS, ptid_get_pid (inferior_ptid),
  94.               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  95.     perror_with_name (_("Couldn't write registers"));
  96. }


  99. /* Support for debugging kernel virtual memory images.  */

  101. #include <machine/pcb.h>

  103. #include "bsd-kvm.h"

  105. static int
  106. ‌vaxbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
  107. {
  108.   int regnum;

  110.   /* The following is true for OpenBSD 3.5:

  112.      The pcb contains the register state at the context switch inside
  113.      cpu_switch().  */

  115.   /* The stack pointer shouldn't be zero.  */
  116.   if (pcb->KSP == 0)
  117.     return 0;

  119.   for (regnum = VAX_R0_REGNUM; regnum < VAX_AP_REGNUM; regnum++)
  120.     regcache_raw_supply (regcache, regnum, &pcb->R[regnum - VAX_R0_REGNUM]);
  121.   regcache_raw_supply (regcache, VAX_AP_REGNUM, &pcb->AP);
  122.   regcache_raw_supply (regcache, VAX_FP_REGNUM, &pcb->FP);
  123.   regcache_raw_supply (regcache, VAX_SP_REGNUM, &pcb->KSP);
  124.   regcache_raw_supply (regcache, VAX_PC_REGNUM, &pcb->PC);
  125.   regcache_raw_supply (regcache, VAX_PS_REGNUM, &pcb->PSL);

  127.   return 1;
  128. }


  131. /* Provide a prototype to silence -Wmissing-prototypes.  */
  132. void _initialize_vaxbsd_nat (void);

  134. void
  135. ‌_initialize_vaxbsd_nat (void)
  136. {
  137.   struct target_ops *t;

  139.   t = inf_ptrace_target ();
  140.   t->to_fetch_registers = vaxbsd_fetch_inferior_registers;
  141.   t->to_store_registers = vaxbsd_store_inferior_registers;
  142.   add_target (t);

  144.   /* Support debugging kernel virtual memory images.  */
  145.   bsd_kvm_add_target (vaxbsd_supply_pcb);
  146. }