Loading...
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 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 | /* * Nios2 KGDB support * * Copyright (C) 2015 Altera Corporation * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> * * Based on the code posted by Kazuyasu on the Altera Forum at: * http://www.alteraforum.com/forum/showpost.php?p=77003&postcount=20 * * 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, see <http://www.gnu.org/licenses/>. * */ #include <linux/ptrace.h> #include <linux/kgdb.h> #include <linux/kdebug.h> #include <linux/io.h> static int wait_for_remote_debugger; struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = { { "zero", GDB_SIZEOF_REG, -1 }, { "at", GDB_SIZEOF_REG, offsetof(struct pt_regs, r1) }, { "r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, r2) }, { "r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, r3) }, { "r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, r4) }, { "r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, r5) }, { "r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, r6) }, { "r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, r7) }, { "r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, r8) }, { "r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, r9) }, { "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, r10) }, { "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, r11) }, { "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, r12) }, { "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, r13) }, { "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, r14) }, { "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, r15) }, { "r16", GDB_SIZEOF_REG, -1 }, { "r17", GDB_SIZEOF_REG, -1 }, { "r18", GDB_SIZEOF_REG, -1 }, { "r19", GDB_SIZEOF_REG, -1 }, { "r20", GDB_SIZEOF_REG, -1 }, { "r21", GDB_SIZEOF_REG, -1 }, { "r22", GDB_SIZEOF_REG, -1 }, { "r23", GDB_SIZEOF_REG, -1 }, { "et", GDB_SIZEOF_REG, -1 }, { "bt", GDB_SIZEOF_REG, -1 }, { "gp", GDB_SIZEOF_REG, offsetof(struct pt_regs, gp) }, { "sp", GDB_SIZEOF_REG, offsetof(struct pt_regs, sp) }, { "fp", GDB_SIZEOF_REG, offsetof(struct pt_regs, fp) }, { "ea", GDB_SIZEOF_REG, -1 }, { "ba", GDB_SIZEOF_REG, -1 }, { "ra", GDB_SIZEOF_REG, offsetof(struct pt_regs, ra) }, { "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, ea) }, { "status", GDB_SIZEOF_REG, -1 }, { "estatus", GDB_SIZEOF_REG, offsetof(struct pt_regs, estatus) }, { "bstatus", GDB_SIZEOF_REG, -1 }, { "ienable", GDB_SIZEOF_REG, -1 }, { "ipending", GDB_SIZEOF_REG, -1}, { "cpuid", GDB_SIZEOF_REG, -1 }, { "ctl6", GDB_SIZEOF_REG, -1 }, { "exception", GDB_SIZEOF_REG, -1 }, { "pteaddr", GDB_SIZEOF_REG, -1 }, { "tlbacc", GDB_SIZEOF_REG, -1 }, { "tlbmisc", GDB_SIZEOF_REG, -1 }, { "eccinj", GDB_SIZEOF_REG, -1 }, { "badaddr", GDB_SIZEOF_REG, -1 }, { "config", GDB_SIZEOF_REG, -1 }, { "mpubase", GDB_SIZEOF_REG, -1 }, { "mpuacc", GDB_SIZEOF_REG, -1 }, }; char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs) { if (regno >= DBG_MAX_REG_NUM || regno < 0) return NULL; if (dbg_reg_def[regno].offset != -1) memcpy(mem, (void *)regs + dbg_reg_def[regno].offset, dbg_reg_def[regno].size); else memset(mem, 0, dbg_reg_def[regno].size); return dbg_reg_def[regno].name; } int dbg_set_reg(int regno, void *mem, struct pt_regs *regs) { if (regno >= DBG_MAX_REG_NUM || regno < 0) return -EINVAL; if (dbg_reg_def[regno].offset != -1) memcpy((void *)regs + dbg_reg_def[regno].offset, mem, dbg_reg_def[regno].size); return 0; } void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) { memset((char *)gdb_regs, 0, NUMREGBYTES); gdb_regs[GDB_SP] = p->thread.kregs->sp; gdb_regs[GDB_PC] = p->thread.kregs->ea; } void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc) { regs->ea = pc; } int kgdb_arch_handle_exception(int vector, int signo, int err_code, char *remcom_in_buffer, char *remcom_out_buffer, struct pt_regs *regs) { char *ptr; unsigned long addr; switch (remcom_in_buffer[0]) { case 's': case 'c': /* handle the optional parameters */ ptr = &remcom_in_buffer[1]; if (kgdb_hex2long(&ptr, &addr)) regs->ea = addr; return 0; } return -1; /* this means that we do not want to exit from the handler */ } asmlinkage void kgdb_breakpoint_c(struct pt_regs *regs) { /* * The breakpoint entry code has moved the PC on by 4 bytes, so we must * move it back. This could be done on the host but we do it here */ if (!wait_for_remote_debugger) regs->ea -= 4; else /* pass the first trap 30 code */ wait_for_remote_debugger = 0; kgdb_handle_exception(30, SIGTRAP, 0, regs); } int kgdb_arch_init(void) { wait_for_remote_debugger = 1; return 0; } void kgdb_arch_exit(void) { /* Nothing to do */ } struct kgdb_arch arch_kgdb_ops = { /* Breakpoint instruction: trap 30 */ .gdb_bpt_instr = { 0xba, 0x6f, 0x3b, 0x00 }, }; |