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