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
vx_read_register(int regnum)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
vx_write_register(int regnum)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 }
129