| /* GNU/Linux/MIPS specific low level interface, for the remote server for GDB. |
| Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002 |
| Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "server.h" |
| #include "linux-low.h" |
| |
| #ifdef HAVE_SYS_REG_H |
| #include <sys/reg.h> |
| #endif |
| |
| #define mips_num_regs 90 |
| |
| #include <asm/ptrace.h> |
| |
| /* Return the ptrace ``address'' of register REGNO. */ |
| |
| /* Matches mips_generic32_regs */ |
| static int mips_regmap[] = { |
| 0, 1, 2, 3, 4, 5, 6, 7, |
| 8, 9, 10, 11, 12, 13, 14, 15, |
| 16, 17, 18, 19, 20, 21, 22, 23, |
| 24, 25, 26, 27, 28, 29, 30, 31, |
| |
| -1, MMLO, MMHI, BADVADDR, CAUSE, PC, |
| |
| FPR_BASE, FPR_BASE + 1, FPR_BASE + 2, FPR_BASE + 3, |
| FPR_BASE + 4, FPR_BASE + 5, FPR_BASE + 6, FPR_BASE + 7, |
| FPR_BASE + 8, FPR_BASE + 8, FPR_BASE + 10, FPR_BASE + 11, |
| FPR_BASE + 12, FPR_BASE + 13, FPR_BASE + 14, FPR_BASE + 15, |
| FPR_BASE + 16, FPR_BASE + 17, FPR_BASE + 18, FPR_BASE + 19, |
| FPR_BASE + 20, FPR_BASE + 21, FPR_BASE + 22, FPR_BASE + 23, |
| FPR_BASE + 24, FPR_BASE + 25, FPR_BASE + 26, FPR_BASE + 27, |
| FPR_BASE + 28, FPR_BASE + 29, FPR_BASE + 30, FPR_BASE + 31, |
| FPC_CSR, FPC_EIR, |
| |
| -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, |
| }; |
| |
| /* From mips-linux-nat.c. */ |
| |
| /* Pseudo registers can not be read. ptrace does not provide a way to |
| read (or set) PS_REGNUM, and there's no point in reading or setting |
| ZERO_REGNUM. We also can not set BADVADDR, CAUSE, or FCRIR via |
| ptrace(). */ |
| |
| static int |
| mips_cannot_fetch_register (int regno) |
| { |
| if (mips_regmap[regno] == -1) |
| return 1; |
| |
| if (find_regno ("zero") == regno) |
| return 1; |
| |
| return 0; |
| } |
| |
| static int |
| mips_cannot_store_register (int regno) |
| { |
| if (mips_regmap[regno] == -1) |
| return 1; |
| |
| if (find_regno ("zero") == regno) |
| return 1; |
| |
| if (find_regno ("cause") == regno) |
| return 1; |
| |
| if (find_regno ("bad") == regno) |
| return 1; |
| |
| if (find_regno ("fir") == regno) |
| return 1; |
| |
| return 0; |
| } |
| |
| static CORE_ADDR |
| mips_get_pc () |
| { |
| unsigned long pc; |
| collect_register_by_name ("pc", &pc); |
| return pc; |
| } |
| |
| static void |
| mips_set_pc (CORE_ADDR pc) |
| { |
| unsigned long newpc = pc; |
| supply_register_by_name ("pc", &newpc); |
| } |
| |
| /* Correct in either endianness. */ |
| static const unsigned long mips_breakpoint = 0x0005000d; |
| #define mips_breakpoint_len 4 |
| |
| /* We only place breakpoints in empty marker functions, and thread locking |
| is outside of the function. So rather than importing software single-step, |
| we can just run until exit. */ |
| static CORE_ADDR |
| mips_reinsert_addr () |
| { |
| unsigned long pc; |
| collect_register_by_name ("ra", &pc); |
| return pc; |
| } |
| |
| static int |
| mips_breakpoint_at (CORE_ADDR where) |
| { |
| unsigned long insn; |
| |
| (*the_target->read_memory) (where, (char *) &insn, 4); |
| if (insn == mips_breakpoint) |
| return 1; |
| |
| /* If necessary, recognize more trap instructions here. GDB only uses the |
| one. */ |
| return 0; |
| } |
| |
| struct linux_target_ops the_low_target = { |
| mips_num_regs, |
| mips_regmap, |
| mips_cannot_fetch_register, |
| mips_cannot_store_register, |
| mips_get_pc, |
| mips_set_pc, |
| (const char *) &mips_breakpoint, |
| mips_breakpoint_len, |
| mips_reinsert_addr, |
| 0, |
| mips_breakpoint_at, |
| }; |