1 /* Native-dependent code for GNU/Linux m32r.
3 Copyright (C) 2004, 2005, 2006, 2007 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 2 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, write to the Free Software
19 Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
26 #include "linux-nat.h"
29 #include "gdb_assert.h"
30 #include "gdb_string.h"
31 #include <sys/ptrace.h>
33 #include <sys/procfs.h>
35 /* Prototypes for supply_gregset etc. */
38 #include "m32r-tdep.h"
43 /* Since EVB register is not available for native debug, we reduce
44 the number of registers. */
45 #define M32R_LINUX_NUM_REGS (M32R_NUM_REGS - 1)
47 /* Mapping between the general-purpose registers in `struct user'
48 format and GDB's register array layout. */
49 static int regmap[] = {
50 4, 5, 6, 7, 0, 1, 2, 8,
51 9, 10, 11, 12, 13, 24, 25, 23,
52 19, 19, 26, 23, 22, 20, 16, 15
56 #define BBPSW_REGMAP 21
60 /* Doee apply to the corresponding SET requests as well. */
61 #define GETREGS_SUPPLIES(regno) (0 <= (regno) && (regno) <= M32R_LINUX_NUM_REGS)
65 /* Transfering the general-purpose registers between GDB, inferiors
68 /* Fill GDB's register array with the general-purpose register values
72 supply_gregset (struct regcache *regcache, const elf_gregset_t * gregsetp)
74 const elf_greg_t *regp = (const elf_greg_t *) gregsetp;
76 unsigned long psw, bbpsw;
78 psw = *(regp + PSW_REGMAP);
79 bbpsw = *(regp + BBPSW_REGMAP);
81 for (i = 0; i < M32R_LINUX_NUM_REGS; i++)
88 regval = ((0x00c1 & bbpsw) << 8) | ((0xc100 & psw) >> 8);
91 regval = ((psw >> 8) & 1);
94 regval = *(regp + regmap[i]);
98 if (i != M32R_SP_REGNUM)
99 regcache_raw_supply (regcache, i, ®val);
100 else if (psw & 0x8000)
101 regcache_raw_supply (regcache, i, regp + SPU_REGMAP);
103 regcache_raw_supply (regcache, i, regp + SPI_REGMAP);
107 /* Fetch all general-purpose registers from process/thread TID and
108 store their values in GDB's register array. */
111 fetch_regs (struct regcache *regcache, int tid)
115 if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
116 perror_with_name (_("Couldn't get registers"));
118 supply_gregset (regcache, (const elf_gregset_t *) ®s);
121 /* Fill register REGNO (if it is a general-purpose register) in
122 *GREGSETPS with the value in GDB's register array. If REGNO is -1,
123 do this for all registers. */
126 fill_gregset (const struct regcache *regcache,
127 elf_gregset_t * gregsetp, int regno)
129 elf_greg_t *regp = (elf_greg_t *) gregsetp;
131 unsigned long psw, bbpsw, tmp;
133 psw = *(regp + PSW_REGMAP);
134 bbpsw = *(regp + BBPSW_REGMAP);
136 for (i = 0; i < M32R_LINUX_NUM_REGS; i++)
138 if (regno != -1 && regno != i)
141 if (i == CBR_REGNUM || i == PSW_REGNUM)
144 if (i == SPU_REGNUM || i == SPI_REGNUM)
147 if (i != M32R_SP_REGNUM)
148 regcache_raw_collect (regcache, i, regp + regmap[i]);
149 else if (psw & 0x8000)
150 regcache_raw_collect (regcache, i, regp + SPU_REGMAP);
152 regcache_raw_collect (regcache, i, regp + SPI_REGMAP);
156 /* Store all valid general-purpose registers in GDB's register array
157 into the process/thread specified by TID. */
160 store_regs (const struct regcache *regcache, int tid, int regno)
164 if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
165 perror_with_name (_("Couldn't get registers"));
167 fill_gregset (regcache, ®s, regno);
169 if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0)
170 perror_with_name (_("Couldn't write registers"));
175 /* Transfering floating-point registers between GDB, inferiors and cores.
176 Since M32R has no floating-point registers, these functions do nothing. */
179 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs)
184 fill_fpregset (const struct regcache *regcache,
185 gdb_fpregset_t *fpregs, int regno)
191 /* Transferring arbitrary registers between GDB and inferior. */
193 /* Fetch register REGNO from the child process. If REGNO is -1, do
194 this for all registers (including the floating point and SSE
198 m32r_linux_fetch_inferior_registers (struct regcache *regcache, int regno)
202 /* GNU/Linux LWP ID's are process ID's. */
203 tid = TIDGET (inferior_ptid);
205 tid = PIDGET (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 regcache *regcache, int regno)
228 /* GNU/Linux LWP ID's are process ID's. */
229 if ((tid = TIDGET (inferior_ptid)) == 0)
230 tid = PIDGET (inferior_ptid); /* Not a threaded program. */
232 /* Use the PTRACE_SETREGS request whenever possible, since it
233 transfers more registers in one system call. */
234 if (regno == -1 || GETREGS_SUPPLIES (regno))
236 store_regs (regcache, tid, regno);
240 internal_error (__FILE__, __LINE__,
241 _("Got request to store bad register number %d."), regno);
244 void _initialize_m32r_linux_nat (void);
247 _initialize_m32r_linux_nat (void)
249 struct target_ops *t;
251 /* Fill in the generic GNU/Linux methods. */
254 /* Add our register access methods. */
255 t->to_fetch_registers = m32r_linux_fetch_inferior_registers;
256 t->to_store_registers = m32r_linux_store_inferior_registers;
258 /* Register the target. */
259 linux_nat_add_target (t);