1 /* Native-dependent code for GNU/Linux m32r.
3 Copyright (C) 2004-2013 Free Software Foundation, Inc.
5 This file is part of GDB.
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 3 of the License, or
10 (at your option) any later version.
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.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "linux-nat.h"
27 #include "gdb_assert.h"
28 #include "gdb_string.h"
29 #include <sys/ptrace.h>
31 #include <sys/procfs.h>
33 /* Prototypes for supply_gregset etc. */
36 #include "m32r-tdep.h"
41 /* Since EVB register is not available for native debug, we reduce
42 the number of registers. */
43 #define M32R_LINUX_NUM_REGS (M32R_NUM_REGS - 1)
45 /* Mapping between the general-purpose registers in `struct user'
46 format and GDB's register array layout. */
47 static int regmap[] = {
48 4, 5, 6, 7, 0, 1, 2, 8,
49 9, 10, 11, 12, 13, 24, 25, 23,
50 19, 19, 26, 23, 22, 20, 16, 15
54 #define BBPSW_REGMAP 21
58 /* Doee (??) apply to the corresponding SET requests as well. */
59 #define GETREGS_SUPPLIES(regno) (0 <= (regno) \
60 && (regno) <= M32R_LINUX_NUM_REGS)
64 /* Transfering the general-purpose registers between GDB, inferiors
67 /* Fill GDB's register array with the general-purpose register values
71 supply_gregset (struct regcache *regcache, const elf_gregset_t * gregsetp)
73 const elf_greg_t *regp = (const elf_greg_t *) gregsetp;
75 unsigned long psw, bbpsw;
77 psw = *(regp + PSW_REGMAP);
78 bbpsw = *(regp + BBPSW_REGMAP);
80 for (i = 0; i < M32R_LINUX_NUM_REGS; i++)
87 regval = ((0x00c1 & bbpsw) << 8) | ((0xc100 & psw) >> 8);
90 regval = ((psw >> 8) & 1);
93 regval = *(regp + regmap[i]);
97 if (i != M32R_SP_REGNUM)
98 regcache_raw_supply (regcache, i, ®val);
99 else if (psw & 0x8000)
100 regcache_raw_supply (regcache, i, regp + SPU_REGMAP);
102 regcache_raw_supply (regcache, i, regp + SPI_REGMAP);
106 /* Fetch all general-purpose registers from process/thread TID and
107 store their values in GDB's register array. */
110 fetch_regs (struct regcache *regcache, int tid)
114 if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
115 perror_with_name (_("Couldn't get registers"));
117 supply_gregset (regcache, (const elf_gregset_t *) ®s);
120 /* Fill register REGNO (if it is a general-purpose register) in
121 *GREGSETPS with the value in GDB's register array. If REGNO is -1,
122 do this for all registers. */
125 fill_gregset (const struct regcache *regcache,
126 elf_gregset_t * gregsetp, int regno)
128 elf_greg_t *regp = (elf_greg_t *) gregsetp;
130 unsigned long psw, bbpsw, tmp;
132 psw = *(regp + PSW_REGMAP);
133 bbpsw = *(regp + BBPSW_REGMAP);
135 for (i = 0; i < M32R_LINUX_NUM_REGS; i++)
137 if (regno != -1 && regno != i)
140 if (i == CBR_REGNUM || i == PSW_REGNUM)
143 if (i == SPU_REGNUM || i == SPI_REGNUM)
146 if (i != M32R_SP_REGNUM)
147 regcache_raw_collect (regcache, i, regp + regmap[i]);
148 else if (psw & 0x8000)
149 regcache_raw_collect (regcache, i, regp + SPU_REGMAP);
151 regcache_raw_collect (regcache, i, regp + SPI_REGMAP);
155 /* Store all valid general-purpose registers in GDB's register array
156 into the process/thread specified by TID. */
159 store_regs (const struct regcache *regcache, int tid, int regno)
163 if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
164 perror_with_name (_("Couldn't get registers"));
166 fill_gregset (regcache, ®s, regno);
168 if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0)
169 perror_with_name (_("Couldn't write registers"));
174 /* Transfering floating-point registers between GDB, inferiors and cores.
175 Since M32R has no floating-point registers, these functions do nothing. */
178 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs)
183 fill_fpregset (const struct regcache *regcache,
184 gdb_fpregset_t *fpregs, int regno)
190 /* Transferring arbitrary registers between GDB and inferior. */
192 /* Fetch register REGNO from the child process. If REGNO is -1, do
193 this for all registers (including the floating point and SSE
197 m32r_linux_fetch_inferior_registers (struct target_ops *ops,
198 struct regcache *regcache, int regno)
202 /* GNU/Linux LWP ID's are process ID's. */
203 tid = ptid_get_lwp (inferior_ptid);
205 tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */
207 /* Use the PTRACE_GETREGS request whenever possible, since it
208 transfers more registers in one system call, and we'll cache the
210 if (regno == -1 || GETREGS_SUPPLIES (regno))
212 fetch_regs (regcache, tid);
216 internal_error (__FILE__, __LINE__,
217 _("Got request for bad register number %d."), regno);
220 /* Store register REGNO back into the child process. If REGNO is -1,
221 do this for all registers (including the floating point and SSE
224 m32r_linux_store_inferior_registers (struct target_ops *ops,
225 struct regcache *regcache, int regno)
229 /* GNU/Linux LWP ID's are process ID's. */
230 if ((tid = ptid_get_lwp (inferior_ptid)) == 0)
231 tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */
233 /* Use the PTRACE_SETREGS request whenever possible, since it
234 transfers more registers in one system call. */
235 if (regno == -1 || GETREGS_SUPPLIES (regno))
237 store_regs (regcache, tid, regno);
241 internal_error (__FILE__, __LINE__,
242 _("Got request to store bad register number %d."), regno);
245 void _initialize_m32r_linux_nat (void);
248 _initialize_m32r_linux_nat (void)
250 struct target_ops *t;
252 /* Fill in the generic GNU/Linux methods. */
255 /* Add our register access methods. */
256 t->to_fetch_registers = m32r_linux_fetch_inferior_registers;
257 t->to_store_registers = m32r_linux_store_inferior_registers;
259 /* Register the target. */
260 linux_nat_add_target (t);