1/* Native-dependent code for GNU/Linux m32r.
2
3   Copyright 2004 Free Software Foundation, Inc.
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 "inferior.h"
24#include "gdbcore.h"
25#include "regcache.h"
26#include "linux-nat.h"
27
28#include "gdb_assert.h"
29#include "gdb_string.h"
30#include <sys/ptrace.h>
31#include <sys/user.h>
32#include <sys/procfs.h>
33
34/* Prototypes for supply_gregset etc.  */
35#include "gregset.h"
36
37#include "m32r-tdep.h"
38
39
40
41
42/* Since EVB register is not available for native debug, we reduce
43   the number of registers.  */
44#define M32R_LINUX_NUM_REGS (M32R_NUM_REGS - 1)
45
46/* Mapping between the general-purpose registers in `struct user'
47   format and GDB's register array layout.  */
48static int regmap[] = {
49  4, 5, 6, 7, 0, 1, 2, 8,
50  9, 10, 11, 12, 13, 24, 25, 23,
51  19, 19, 26, 23, 22, 20, 16, 15
52};
53
54#define PSW_REGMAP 19
55#define BBPSW_REGMAP 21
56#define SPU_REGMAP 23
57#define SPI_REGMAP 26
58
59/* Doee apply to the corresponding SET requests as well.  */
60#define GETREGS_SUPPLIES(regno) (0 <= (regno) && (regno) <= M32R_LINUX_NUM_REGS)
61
62
63
64/* Transfering the general-purpose registers between GDB, inferiors
65   and core files.  */
66
67/* Fill GDB's register array with the general-purpose register values
68   in *GREGSETP.  */
69
70void
71supply_gregset (elf_gregset_t * gregsetp)
72{
73  elf_greg_t *regp = (elf_greg_t *) gregsetp;
74  int i;
75  unsigned long psw, bbpsw;
76
77  psw = *(regp + PSW_REGMAP);
78  bbpsw = *(regp + BBPSW_REGMAP);
79
80  for (i = 0; i < M32R_LINUX_NUM_REGS; i++)
81    {
82      switch (i)
83	{
84	case PSW_REGNUM:
85	  *(regp + regmap[i]) =
86	    ((0x00c1 & bbpsw) << 8) | ((0xc100 & psw) >> 8);
87	  break;
88	case CBR_REGNUM:
89	  *(regp + regmap[i]) = ((psw >> 8) & 1);
90	  break;
91	}
92
93      if (i != M32R_SP_REGNUM)
94	regcache_raw_supply (current_regcache, i, regp + regmap[i]);
95      else if (psw & 0x8000)
96	regcache_raw_supply (current_regcache, i, regp + SPU_REGMAP);
97      else
98	regcache_raw_supply (current_regcache, i, regp + SPI_REGMAP);
99    }
100}
101
102/* Fetch all general-purpose registers from process/thread TID and
103   store their values in GDB's register array.  */
104
105static void
106fetch_regs (int tid)
107{
108  elf_gregset_t regs;
109
110  if (ptrace (PTRACE_GETREGS, tid, 0, (int) &regs) < 0)
111    perror_with_name ("Couldn't get registers");
112
113  supply_gregset (&regs);
114}
115
116/* Fill register REGNO (if it is a general-purpose register) in
117   *GREGSETPS with the value in GDB's register array.  If REGNO is -1,
118   do this for all registers.  */
119
120void
121fill_gregset (elf_gregset_t * gregsetp, int regno)
122{
123  elf_greg_t *regp = (elf_greg_t *) gregsetp;
124  int i;
125  unsigned long psw, bbpsw, tmp;
126
127  psw = *(regp + PSW_REGMAP);
128  bbpsw = *(regp + BBPSW_REGMAP);
129
130  for (i = 0; i < M32R_LINUX_NUM_REGS; i++)
131    {
132      if (regno != -1 && regno != i)
133	continue;
134
135      if (i == CBR_REGNUM || i == PSW_REGNUM)
136	continue;
137
138      if (i == SPU_REGNUM || i == SPI_REGNUM)
139	continue;
140
141      if (i != M32R_SP_REGNUM)
142	regcache_raw_collect (current_regcache, i, regp + regmap[i]);
143      else if (psw & 0x8000)
144	regcache_raw_collect (current_regcache, i, regp + SPU_REGMAP);
145      else
146	regcache_raw_collect (current_regcache, i, regp + SPI_REGMAP);
147    }
148}
149
150/* Store all valid general-purpose registers in GDB's register array
151   into the process/thread specified by TID.  */
152
153static void
154store_regs (int tid, int regno)
155{
156  elf_gregset_t regs;
157
158  if (ptrace (PTRACE_GETREGS, tid, 0, (int) &regs) < 0)
159    perror_with_name ("Couldn't get registers");
160
161  fill_gregset (&regs, regno);
162
163  if (ptrace (PTRACE_SETREGS, tid, 0, (int) &regs) < 0)
164    perror_with_name ("Couldn't write registers");
165}
166
167
168
169/* Transfering floating-point registers between GDB, inferiors and cores.
170   Since M32R has no floating-point registers, these functions do nothing.  */
171
172void
173supply_fpregset (gdb_fpregset_t *fpregs)
174{
175}
176
177void
178fill_fpregset (gdb_fpregset_t *fpregs, int regno)
179{
180}
181
182
183
184/* Transferring arbitrary registers between GDB and inferior.  */
185
186/* Fetch register REGNO from the child process.  If REGNO is -1, do
187   this for all registers (including the floating point and SSE
188   registers).  */
189
190void
191fetch_inferior_registers (int regno)
192{
193  int tid;
194
195  /* GNU/Linux LWP ID's are process ID's.  */
196  tid = TIDGET (inferior_ptid);
197  if (tid == 0)
198    tid = PIDGET (inferior_ptid);	/* Not a threaded program.  */
199
200  /* Use the PTRACE_GETREGS request whenever possible, since it
201     transfers more registers in one system call, and we'll cache the
202     results.  */
203  if (regno == -1 || GETREGS_SUPPLIES (regno))
204    {
205      fetch_regs (tid);
206      return;
207    }
208
209  internal_error (__FILE__, __LINE__,
210		  "Got request for bad register number %d.", regno);
211}
212
213/* Store register REGNO back into the child process.  If REGNO is -1,
214   do this for all registers (including the floating point and SSE
215   registers).  */
216void
217store_inferior_registers (int regno)
218{
219  int tid;
220
221  /* GNU/Linux LWP ID's are process ID's.  */
222  if ((tid = TIDGET (inferior_ptid)) == 0)
223    tid = PIDGET (inferior_ptid);	/* Not a threaded program.  */
224
225  /* Use the PTRACE_SETREGS request whenever possible, since it
226     transfers more registers in one system call.  */
227  if (regno == -1 || GETREGS_SUPPLIES (regno))
228    {
229      store_regs (tid, regno);
230      return;
231    }
232
233  internal_error (__FILE__, __LINE__,
234		  "Got request to store bad register number %d.", regno);
235}
236