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 <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 #include <sys/param.h> 33 #include <sys/proc.h> 34 #include <sys/kdb.h> 35 #include <machine/pcb.h> 36 #include <ddb/ddb.h> 37 #include <ddb/db_sym.h> 38 39 #include <machine/armreg.h> 40 #include <machine/debug_monitor.h> 41 #include <machine/stack.h> 42 43 void 44 db_md_list_watchpoints() 45 { 46 47 dbg_show_watchpoint(); 48 } 49 50 int 51 db_md_clr_watchpoint(db_expr_t addr, db_expr_t size) 52 { 53 54 return (dbg_remove_watchpoint(addr, size, DBG_FROM_EL1)); 55 } 56 57 int 58 db_md_set_watchpoint(db_expr_t addr, db_expr_t size) 59 { 60 61 return (dbg_setup_watchpoint(addr, size, DBG_FROM_EL1, 62 HW_BREAKPOINT_RW)); 63 } 64 65 static void 66 db_stack_trace_cmd(struct unwind_state *frame) 67 { 68 c_db_sym_t sym; 69 const char *name; 70 db_expr_t value; 71 db_expr_t offset; 72 73 while (1) { 74 uint64_t pc = frame->pc; 75 int ret; 76 77 ret = unwind_frame(frame); 78 if (ret < 0) 79 break; 80 81 sym = db_search_symbol(pc, DB_STGY_ANY, &offset); 82 if (sym == C_DB_SYM_NULL) { 83 value = 0; 84 name = "(null)"; 85 } else 86 db_symbol_values(sym, &name, &value); 87 88 db_printf("%s() at ", name); 89 db_printsym(frame->pc, DB_STGY_PROC); 90 db_printf("\n"); 91 92 db_printf("\t pc = 0x%016lx lr = 0x%016lx\n", pc, 93 frame->pc); 94 db_printf("\t sp = 0x%016lx fp = 0x%016lx\n", frame->sp, 95 frame->fp); 96 /* TODO: Show some more registers */ 97 db_printf("\n"); 98 } 99 } 100 101 int 102 db_trace_thread(struct thread *thr, int count) 103 { 104 struct unwind_state frame; 105 struct pcb *ctx; 106 107 if (thr != curthread) { 108 ctx = kdb_thr_ctx(thr); 109 110 frame.sp = (uint64_t)ctx->pcb_sp; 111 frame.fp = (uint64_t)ctx->pcb_x[29]; 112 frame.pc = (uint64_t)ctx->pcb_x[30]; 113 db_stack_trace_cmd(&frame); 114 } else 115 db_trace_self(); 116 return (0); 117 } 118 119 void 120 db_trace_self(void) 121 { 122 struct unwind_state frame; 123 uint64_t sp; 124 125 __asm __volatile("mov %0, sp" : "=&r" (sp)); 126 127 frame.sp = sp; 128 frame.fp = (uint64_t)__builtin_frame_address(0); 129 frame.pc = (uint64_t)db_trace_self; 130 db_stack_trace_cmd(&frame); 131 } 132