1 /*- 2 * Copyright (c) 2015 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Semihalf under 6 * the sponsorship of the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include "opt_ddb.h" 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 #include <sys/param.h> 35 #include <sys/proc.h> 36 #include <sys/kdb.h> 37 #include <machine/pcb.h> 38 #include <ddb/ddb.h> 39 #include <ddb/db_sym.h> 40 41 #include <machine/armreg.h> 42 #include <machine/debug_monitor.h> 43 #include <machine/stack.h> 44 45 void 46 db_md_list_watchpoints() 47 { 48 49 dbg_show_watchpoint(); 50 } 51 52 int 53 db_md_clr_watchpoint(db_expr_t addr, db_expr_t size) 54 { 55 56 return (dbg_remove_watchpoint(addr, size, DBG_FROM_EL1)); 57 } 58 59 int 60 db_md_set_watchpoint(db_expr_t addr, db_expr_t size) 61 { 62 63 return (dbg_setup_watchpoint(addr, size, DBG_FROM_EL1, 64 HW_BREAKPOINT_RW)); 65 } 66 67 static void 68 db_stack_trace_cmd(struct unwind_state *frame) 69 { 70 c_db_sym_t sym; 71 const char *name; 72 db_expr_t value; 73 db_expr_t offset; 74 75 while (1) { 76 uint64_t pc = frame->pc; 77 int ret; 78 79 ret = unwind_frame(frame); 80 if (ret < 0) 81 break; 82 83 sym = db_search_symbol(pc, DB_STGY_ANY, &offset); 84 if (sym == C_DB_SYM_NULL) { 85 value = 0; 86 name = "(null)"; 87 } else 88 db_symbol_values(sym, &name, &value); 89 90 db_printf("%s() at ", name); 91 db_printsym(frame->pc, DB_STGY_PROC); 92 db_printf("\n"); 93 94 db_printf("\t pc = 0x%016lx lr = 0x%016lx\n", pc, 95 frame->pc); 96 db_printf("\t sp = 0x%016lx fp = 0x%016lx\n", frame->sp, 97 frame->fp); 98 /* TODO: Show some more registers */ 99 db_printf("\n"); 100 } 101 } 102 103 int 104 db_trace_thread(struct thread *thr, int count) 105 { 106 struct unwind_state frame; 107 struct pcb *ctx; 108 109 if (thr != curthread) { 110 ctx = kdb_thr_ctx(thr); 111 112 frame.sp = (uint64_t)ctx->pcb_sp; 113 frame.fp = (uint64_t)ctx->pcb_x[29]; 114 frame.pc = (uint64_t)ctx->pcb_x[30]; 115 db_stack_trace_cmd(&frame); 116 } else 117 db_trace_self(); 118 return (0); 119 } 120 121 void 122 db_trace_self(void) 123 { 124 struct unwind_state frame; 125 uint64_t sp; 126 127 __asm __volatile("mov %0, sp" : "=&r" (sp)); 128 129 frame.sp = sp; 130 frame.fp = (uint64_t)__builtin_frame_address(0); 131 frame.pc = (uint64_t)db_trace_self; 132 db_stack_trace_cmd(&frame); 133 } 134