1 /* GNU/Linux/MIPS specific low level interface, for the remote server for GDB.
2 Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002
3 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., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 #include "linux-low.h"
29 #define mips_num_regs 90
31 #include <asm/ptrace.h>
33 /* Return the ptrace ``address'' of register REGNO. */
35 /* Matches mips_generic32_regs */
36 static int mips_regmap[] = {
37 0, 1, 2, 3, 4, 5, 6, 7,
38 8, 9, 10, 11, 12, 13, 14, 15,
39 16, 17, 18, 19, 20, 21, 22, 23,
40 24, 25, 26, 27, 28, 29, 30, 31,
42 -1, MMLO, MMHI, BADVADDR, CAUSE, PC,
44 FPR_BASE, FPR_BASE + 1, FPR_BASE + 2, FPR_BASE + 3,
45 FPR_BASE + 4, FPR_BASE + 5, FPR_BASE + 6, FPR_BASE + 7,
46 FPR_BASE + 8, FPR_BASE + 8, FPR_BASE + 10, FPR_BASE + 11,
47 FPR_BASE + 12, FPR_BASE + 13, FPR_BASE + 14, FPR_BASE + 15,
48 FPR_BASE + 16, FPR_BASE + 17, FPR_BASE + 18, FPR_BASE + 19,
49 FPR_BASE + 20, FPR_BASE + 21, FPR_BASE + 22, FPR_BASE + 23,
50 FPR_BASE + 24, FPR_BASE + 25, FPR_BASE + 26, FPR_BASE + 27,
51 FPR_BASE + 28, FPR_BASE + 29, FPR_BASE + 30, FPR_BASE + 31,
55 -1, -1, -1, -1, -1, -1, -1, -1,
56 -1, -1, -1, -1, -1, -1, -1, -1,
59 /* From mips-linux-nat.c. */
61 /* Pseudo registers can not be read. ptrace does not provide a way to
62 read (or set) PS_REGNUM, and there's no point in reading or setting
63 ZERO_REGNUM. We also can not set BADVADDR, CAUSE, or FCRIR via
67 mips_cannot_fetch_register (int regno)
69 if (mips_regmap[regno] == -1)
72 if (find_regno ("zero") == regno)
79 mips_cannot_store_register (int regno)
81 if (mips_regmap[regno] == -1)
84 if (find_regno ("zero") == regno)
87 if (find_regno ("cause") == regno)
90 if (find_regno ("bad") == regno)
93 if (find_regno ("fir") == regno)
103 collect_register_by_name ("pc", &pc);
108 mips_set_pc (CORE_ADDR pc)
110 unsigned long newpc = pc;
111 supply_register_by_name ("pc", &newpc);
114 /* Correct in either endianness. */
115 static const unsigned long mips_breakpoint = 0x0005000d;
116 #define mips_breakpoint_len 4
118 /* We only place breakpoints in empty marker functions, and thread locking
119 is outside of the function. So rather than importing software single-step,
120 we can just run until exit. */
122 mips_reinsert_addr ()
125 collect_register_by_name ("ra", &pc);
130 mips_breakpoint_at (CORE_ADDR where)
134 (*the_target->read_memory) (where, (char *) &insn, 4);
135 if (insn == mips_breakpoint)
138 /* If necessary, recognize more trap instructions here. GDB only uses the
143 struct linux_target_ops the_low_target = {
146 mips_cannot_fetch_register,
147 mips_cannot_store_register,
150 (const char *) &mips_breakpoint,