gdb/remote-vxsparc.c

   1 /* SPARC-specific portions of the RPC protocol for VxWorks.
   2
   3    Contributed by Wind River Systems.
   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 2 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, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "regcache.h"
  24
  25 #include "gdb_string.h"
  26
  27 #include "sparc-tdep.h"
  28
  29 #include "vx-share/ptrace.h"
  30 #include "vx-share/regPacket.h"
  31
  32 #define SPARC_R_G1      (SPARC_R_G0 + SPARC_GREG_SIZE)
  33
  34 const struct sparc_gregset vxsparc_gregset =
  35 {
  36   SPARC_R_PSR,                  /* %psr */
  37   SPARC_R_PC,                   /* %pc */
  38   SPARC_R_NPC,                  /* %npc */
  39   SPARC_R_Y,                    /* %y */
  40   SPARC_R_WIM,                  /* %wim */
  41   SPARC_R_TBR,                  /* %tbr */
  42   SPARC_R_G1,                   /* %g1 */
  43   SPARC_R_I0                    /* %l0 */
  44 };
  45
  46 /* Flag set if target has an FPU.  */
  47
  48 extern int target_has_fp;
  49
  50 /* Generic register read/write routines in remote-vx.c.  */
  51
  52 extern void net_read_registers ();
  53 extern void net_write_registers ();
  54
  55 /* Read a register or registers from the VxWorks target.  REGNUM is
  56    the register to read, or -1 for all; currently, it is ignored.
  57    FIXME: Look at REGNUM to improve efficiency.  */
  58
  59 void
  60 vx_read_register (int regnum)
  61 {
  62   struct regcache *regcache = current_regcache;
  63   char gregs[SPARC_GREG_PLEN];
  64   char fpregs[SPARC_FPREG_PLEN];
  65   CORE_ADDR sp;
  66
  67   /* Get the general-purpose registers.  */
  68   net_read_registers (gregs, SPARC_GREG_PLEN, PTRACE_GETREGS);
  69   sparc32_supply_gregset (&vxsparc_gregset, regcache, -1, gregs);
  70
  71   /* If the target has floating-point registers, fetch them.
  72      Otherwise, zero the floating-point register values in GDB's
  73      register cache for good measure, even though we might not need
  74      to.  */
  75   if (target_has_fp)
  76     net_read_registers (fpregs, SPARC_FPREG_PLEN, PTRACE_GETFPREGS);
  77   else
  78     memset (fpregs, 0, SPARC_FPREG_PLEN);
  79   sparc32_supply_fpregset (regcache, -1, fpregs);
  80 }
  81
  82 /* Store a register or registers into the VxWorks target.  REGNUM is
  83    the register to store, or -1 for all; currently, it is ignored.
  84    FIXME: Look at REGNUM to improve efficiency.  */
  85
  86 void
  87 vx_write_register (int regnum)
  88 {
  89   struct regcache *regcache = current_regcache;
  90   char gregs[SPARC_GREG_PLEN];
  91   char fpregs[SPARC_FPREG_PLEN];
  92   int gregs_p = 1;
  93   int fpregs_p = 1;
  94   CORE_ADDR sp;
  95
  96   if (regnum != -1)
  97     {
  98       if ((SPARC_G0_REGNUM <= regnum && regnum <= SPARC_I7_REGNUM)
  99           || (SPARC32_Y_REGNUM <= regnum && regnum <= SPARC32_NPC_REGNUM))
 100         fpregs_p = 0;
 101       else
 102         gregs_p = 0;
 103     }
 104
 105   /* Store the general-purpose registers.  */
 106   if (gregs_p)
 107     {
 108       sparc32_collect_gregset (&vxsparc_gregset, regcache, -1, gregs);
 109       net_write_registers (gregs, SPARC_GREG_PLEN, PTRACE_SETREGS);
 110
 111       /* Deal with the stack regs.  */
 112       if (regnum == -1 || regnum == SPARC_SP_REGNUM
 113           || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM))
 114         {
 115           ULONGEST sp;
 116
 117           regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp);
 118           sparc_collect_rwindow (regcache, sp, regnum);
 119         }
 120     }
 121
 122   /* Store the floating-point registers if the target has them.  */
 123   if (fpregs_p && target_has_fp)
 124     {
 125       sparc32_collect_fpregset (regcache, -1, fpregs);
 126       net_write_registers (fpregs, SPARC_FPREG_PLEN, PTRACE_SETFPREGS);
 127     }
 128 }