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
34const 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
48extern int target_has_fp;
49
50/* Generic register read/write routines in remote-vx.c.  */
51
52extern void net_read_registers ();
53extern 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
59void
60vx_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
86void
87vx_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}
129