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 { "spsr", DB_OFFSET(tf_spsr), db_frame }, 66 { "x0", DB_OFFSET(tf_x[0]), db_frame }, 67 { "x1", DB_OFFSET(tf_x[1]), db_frame }, 68 { "x2", DB_OFFSET(tf_x[2]), db_frame }, 69 { "x3", DB_OFFSET(tf_x[3]), db_frame }, 70 { "x4", DB_OFFSET(tf_x[4]), db_frame }, 71 { "x5", DB_OFFSET(tf_x[5]), db_frame }, 72 { "x6", DB_OFFSET(tf_x[6]), db_frame }, 73 { "x7", DB_OFFSET(tf_x[7]), db_frame }, 74 { "x8", DB_OFFSET(tf_x[8]), db_frame }, 75 { "x9", DB_OFFSET(tf_x[9]), db_frame }, 76 { "x10", DB_OFFSET(tf_x[10]), db_frame }, 77 { "x11", DB_OFFSET(tf_x[11]), db_frame }, 78 { "x12", DB_OFFSET(tf_x[12]), db_frame }, 79 { "x13", DB_OFFSET(tf_x[13]), db_frame }, 80 { "x14", DB_OFFSET(tf_x[14]), db_frame }, 81 { "x15", DB_OFFSET(tf_x[15]), db_frame }, 82 { "x16", DB_OFFSET(tf_x[16]), db_frame }, 83 { "x17", DB_OFFSET(tf_x[17]), db_frame }, 84 { "x18", DB_OFFSET(tf_x[18]), db_frame }, 85 { "x19", DB_OFFSET(tf_x[19]), db_frame }, 86 { "x20", DB_OFFSET(tf_x[20]), db_frame }, 87 { "x21", DB_OFFSET(tf_x[21]), db_frame }, 88 { "x22", DB_OFFSET(tf_x[22]), db_frame }, 89 { "x23", DB_OFFSET(tf_x[23]), db_frame }, 90 { "x24", DB_OFFSET(tf_x[24]), db_frame }, 91 { "x25", DB_OFFSET(tf_x[25]), db_frame }, 92 { "x26", DB_OFFSET(tf_x[26]), db_frame }, 93 { "x27", DB_OFFSET(tf_x[27]), db_frame }, 94 { "x28", DB_OFFSET(tf_x[28]), db_frame }, 95 { "x29", DB_OFFSET(tf_x[29]), db_frame }, 96 { "lr", DB_OFFSET(tf_lr), db_frame }, 97 { "elr", DB_OFFSET(tf_elr), db_frame }, 98 { "sp", DB_OFFSET(tf_sp), db_frame }, 99 }; 100 101 struct db_variable *db_eregs = db_regs + nitems(db_regs); 102 103 void 104 db_show_mdpcpu(struct pcpu *pc) 105 { 106 } 107 108 /* 109 * Read bytes from kernel address space for debugger. 110 */ 111 int 112 db_read_bytes(vm_offset_t addr, size_t size, char *data) 113 { 114 jmp_buf jb; 115 void *prev_jb; 116 const char *src; 117 int ret; 118 uint64_t tmp64; 119 uint32_t tmp32; 120 uint16_t tmp16; 121 122 prev_jb = kdb_jmpbuf(jb); 123 ret = setjmp(jb); 124 125 if (ret == 0) { 126 src = (const char *)addr; 127 if (size == 8 && (addr & 7) == 0) { 128 tmp64 = *((const int *)src); 129 src = (const char *)&tmp64; 130 } else if (size == 4 && (addr & 3) == 0) { 131 tmp32 = *((const int *)src); 132 src = (const char *)&tmp32; 133 } else if (size == 2 && (addr & 1) == 0) { 134 tmp16 = *((const short *)src); 135 src = (const char *)&tmp16; 136 } 137 while (size-- > 0) 138 *data++ = *src++; 139 } 140 (void)kdb_jmpbuf(prev_jb); 141 142 return (ret); 143 } 144 145 /* 146 * Write bytes to kernel address space for debugger. 147 */ 148 int 149 db_write_bytes(vm_offset_t addr, size_t size, char *data) 150 { 151 jmp_buf jb; 152 void *prev_jb; 153 char *dst; 154 size_t i; 155 int ret; 156 157 prev_jb = kdb_jmpbuf(jb); 158 ret = setjmp(jb); 159 if (ret == 0) { 160 if (!arm64_get_writable_addr(addr, &addr)) { 161 ret = 1; 162 } else { 163 dst = (char *)addr; 164 for (i = 0; i < size; i++) 165 *dst++ = *data++; 166 dsb(ish); 167 168 /* 169 * Ensure the I & D cache are in sync if we wrote 170 * to executable memory. 171 */ 172 cpu_icache_sync_range(addr, (vm_size_t)size); 173 } 174 } 175 (void)kdb_jmpbuf(prev_jb); 176 177 return (ret); 178 } 179