1/* GNU/Linux/PowerPC specific low level interface, for the remote server for 2 GDB. 3 Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002 4 Free Software Foundation, Inc. 5 6 This file is part of GDB. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 59 Temple Place - Suite 330, 21 Boston, MA 02111-1307, USA. */ 22 23#include "server.h" 24#include "linux-low.h" 25 26#include <asm/ptrace.h> 27 28#define ppc_num_regs 71 29 30/* Currently, don't check/send MQ. */ 31static int ppc_regmap[] = 32 {PT_R0 * 4, PT_R1 * 4, PT_R2 * 4, PT_R3 * 4, 33 PT_R4 * 4, PT_R5 * 4, PT_R6 * 4, PT_R7 * 4, 34 PT_R8 * 4, PT_R9 * 4, PT_R10 * 4, PT_R11 * 4, 35 PT_R12 * 4, PT_R13 * 4, PT_R14 * 4, PT_R15 * 4, 36 PT_R16 * 4, PT_R17 * 4, PT_R18 * 4, PT_R19 * 4, 37 PT_R20 * 4, PT_R21 * 4, PT_R22 * 4, PT_R23 * 4, 38 PT_R24 * 4, PT_R25 * 4, PT_R26 * 4, PT_R27 * 4, 39 PT_R28 * 4, PT_R29 * 4, PT_R30 * 4, PT_R31 * 4, 40 PT_FPR0*4, PT_FPR0*4 + 8, PT_FPR0*4+16, PT_FPR0*4+24, 41 PT_FPR0*4+32, PT_FPR0*4+40, PT_FPR0*4+48, PT_FPR0*4+56, 42 PT_FPR0*4+64, PT_FPR0*4+72, PT_FPR0*4+80, PT_FPR0*4+88, 43 PT_FPR0*4+96, PT_FPR0*4+104, PT_FPR0*4+112, PT_FPR0*4+120, 44 PT_FPR0*4+128, PT_FPR0*4+136, PT_FPR0*4+144, PT_FPR0*4+152, 45 PT_FPR0*4+160, PT_FPR0*4+168, PT_FPR0*4+176, PT_FPR0*4+184, 46 PT_FPR0*4+192, PT_FPR0*4+200, PT_FPR0*4+208, PT_FPR0*4+216, 47 PT_FPR0*4+224, PT_FPR0*4+232, PT_FPR0*4+240, PT_FPR0*4+248, 48 PT_NIP * 4, PT_MSR * 4, PT_CCR * 4, PT_LNK * 4, 49 PT_CTR * 4, PT_XER * 4, PT_FPSCR * 4, }; 50 51static int 52ppc_cannot_store_register (int regno) 53{ 54 /* Some kernels do not allow us to store fpscr. */ 55 if (regno == find_regno ("fpscr")) 56 return 2; 57 58 return 0; 59} 60 61static int 62ppc_cannot_fetch_register (int regno) 63{ 64 return 0; 65} 66 67static CORE_ADDR 68ppc_get_pc (void) 69{ 70 unsigned long pc; 71 72 collect_register_by_name ("pc", &pc); 73 return (CORE_ADDR) pc; 74} 75 76static void 77ppc_set_pc (CORE_ADDR pc) 78{ 79 unsigned long newpc = pc; 80 81 supply_register_by_name ("pc", &newpc); 82} 83 84/* Correct in either endianness. Note that this file is 85 for PowerPC only, not PowerPC64. 86 This instruction is "twge r2, r2", which GDB uses as a software 87 breakpoint. */ 88static const unsigned long ppc_breakpoint = 0x7d821008; 89#define ppc_breakpoint_len 4 90 91static int 92ppc_breakpoint_at (CORE_ADDR where) 93{ 94 unsigned long insn; 95 96 (*the_target->read_memory) (where, (char *) &insn, 4); 97 if (insn == ppc_breakpoint) 98 return 1; 99 /* If necessary, recognize more trap instructions here. GDB only uses the 100 one. */ 101 return 0; 102} 103 104struct linux_target_ops the_low_target = { 105 ppc_num_regs, 106 ppc_regmap, 107 ppc_cannot_fetch_register, 108 ppc_cannot_store_register, 109 ppc_get_pc, 110 ppc_set_pc, 111 (const char *) &ppc_breakpoint, 112 ppc_breakpoint_len, 113 NULL, 114 0, 115 ppc_breakpoint_at, 116}; 117