| 1 | /* GNU/Linux/PowerPC specific low level interface, for the remote server for |
| 2 | GDB. |
| 3 | Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2005 |
| 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. */ |
| 31 | static 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 | |
| 51 | static int |
| 52 | ppc_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 | |
| 61 | static int |
| 62 | ppc_cannot_fetch_register (int regno) |
| 63 | { |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | static CORE_ADDR |
| 68 | ppc_get_pc (void) |
| 69 | { |
| 70 | unsigned long pc; |
| 71 | |
| 72 | collect_register_by_name ("pc", &pc); |
| 73 | return (CORE_ADDR) pc; |
| 74 | } |
| 75 | |
| 76 | static void |
| 77 | ppc_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. */ |
| 88 | static const unsigned long ppc_breakpoint = 0x7d821008; |
| 89 | #define ppc_breakpoint_len 4 |
| 90 | |
| 91 | static int |
| 92 | ppc_breakpoint_at (CORE_ADDR where) |
| 93 | { |
| 94 | unsigned long insn; |
| 95 | |
| 96 | (*the_target->read_memory) (where, (unsigned 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 | |
| 104 | struct 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 unsigned char *) &ppc_breakpoint, |
| 112 | ppc_breakpoint_len, |
| 113 | NULL, |
| 114 | 0, |
| 115 | ppc_breakpoint_at, |
| 116 | }; |