1 /*- 2 * Copyright (c) 2015 The FreeBSD Foundation 3 * 4 * This software was developed by Semihalf under 5 * the sponsorship of the FreeBSD Foundation. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/param.h> 30 #include <sys/proc.h> 31 #include <vm/vm.h> 32 #include <vm/pmap.h> 33 #include <vm/vm_map.h> 34 35 #ifdef KDB 36 #include <sys/kdb.h> 37 #endif 38 39 #include <ddb/ddb.h> 40 #include <ddb/db_variables.h> 41 42 #include <machine/cpu.h> 43 #include <machine/pcb.h> 44 #include <machine/stack.h> 45 #include <machine/vmparam.h> 46 47 static int 48 db_frame(struct db_variable *vp, db_expr_t *valuep, int op) 49 { 50 long *reg; 51 52 if (kdb_frame == NULL) 53 return (0); 54 55 reg = (long *)((uintptr_t)kdb_frame + (db_expr_t)vp->valuep); 56 if (op == DB_VAR_GET) 57 *valuep = *reg; 58 else 59 *reg = *valuep; 60 return (1); 61 } 62 63 #define DB_OFFSET(x) (db_expr_t *)offsetof(struct trapframe, x) 64 struct db_variable db_regs[] = { 65 { "ra", DB_OFFSET(tf_ra), db_frame }, 66 { "sp", DB_OFFSET(tf_sp), db_frame }, 67 { "gp", DB_OFFSET(tf_gp), db_frame }, 68 { "tp", DB_OFFSET(tf_tp), db_frame }, 69 { "t0", DB_OFFSET(tf_t[0]), db_frame }, 70 { "t1", DB_OFFSET(tf_t[1]), db_frame }, 71 { "t2", DB_OFFSET(tf_t[2]), db_frame }, 72 { "t3", DB_OFFSET(tf_t[3]), db_frame }, 73 { "t4", DB_OFFSET(tf_t[4]), db_frame }, 74 { "t5", DB_OFFSET(tf_t[5]), db_frame }, 75 { "t6", DB_OFFSET(tf_t[6]), db_frame }, 76 { "s0", DB_OFFSET(tf_s[0]), db_frame }, 77 { "s1", DB_OFFSET(tf_s[1]), db_frame }, 78 { "s2", DB_OFFSET(tf_s[2]), db_frame }, 79 { "s3", DB_OFFSET(tf_s[3]), db_frame }, 80 { "s4", DB_OFFSET(tf_s[4]), db_frame }, 81 { "s5", DB_OFFSET(tf_s[5]), db_frame }, 82 { "s6", DB_OFFSET(tf_s[6]), db_frame }, 83 { "s7", DB_OFFSET(tf_s[7]), db_frame }, 84 { "s8", DB_OFFSET(tf_s[8]), db_frame }, 85 { "s9", DB_OFFSET(tf_s[9]), db_frame }, 86 { "s10", DB_OFFSET(tf_s[10]), db_frame }, 87 { "s11", DB_OFFSET(tf_s[11]), db_frame }, 88 { "a0", DB_OFFSET(tf_a[0]), db_frame }, 89 { "a1", DB_OFFSET(tf_a[1]), db_frame }, 90 { "a2", DB_OFFSET(tf_a[2]), db_frame }, 91 { "a3", DB_OFFSET(tf_a[3]), db_frame }, 92 { "a4", DB_OFFSET(tf_a[4]), db_frame }, 93 { "a5", DB_OFFSET(tf_a[5]), db_frame }, 94 { "a6", DB_OFFSET(tf_a[6]), db_frame }, 95 { "a7", DB_OFFSET(tf_a[7]), db_frame }, 96 { "sepc", DB_OFFSET(tf_sepc), db_frame }, 97 { "sstatus", DB_OFFSET(tf_sstatus), db_frame }, 98 { "stval", DB_OFFSET(tf_stval), db_frame }, 99 { "scause", DB_OFFSET(tf_scause), db_frame }, 100 }; 101 102 struct db_variable *db_eregs = db_regs + nitems(db_regs); 103 104 void 105 db_show_mdpcpu(struct pcpu *pc) 106 { 107 db_printf("curpmap = %p\n", pc->pc_curpmap); 108 db_printf("pending_ipis = %x\n", pc->pc_pending_ipis); 109 db_printf("hart = %u\n", pc->pc_hart); 110 } 111 112 /* 113 * Read bytes from kernel address space for debugger. 114 */ 115 int 116 db_read_bytes(vm_offset_t addr, size_t size, char *data) 117 { 118 jmp_buf jb; 119 void *prev_jb; 120 const char *src; 121 int ret; 122 123 prev_jb = kdb_jmpbuf(jb); 124 ret = setjmp(jb); 125 126 if (ret == 0) { 127 src = (const char *)addr; 128 while (size-- > 0) 129 *data++ = *src++; 130 } 131 (void)kdb_jmpbuf(prev_jb); 132 133 return (ret); 134 } 135 136 /* 137 * Write bytes to kernel address space for debugger. 138 */ 139 int 140 db_write_bytes(vm_offset_t addr, size_t size, char *data) 141 { 142 jmp_buf jb; 143 void *prev_jb; 144 char *dst; 145 int ret; 146 147 prev_jb = kdb_jmpbuf(jb); 148 ret = setjmp(jb); 149 if (ret == 0) { 150 dst = (char *)addr; 151 while (size-- > 0) 152 *dst++ = *data++; 153 154 /* Invalidate I-cache */ 155 fence_i(); 156 } 157 (void)kdb_jmpbuf(prev_jb); 158 159 return (ret); 160 } 161