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 "opt_ddb.h" 30 31 #include <sys/param.h> 32 #include <sys/proc.h> 33 #include <sys/kdb.h> 34 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 #include <machine/vmparam.h> 43 44 #define FRAME_NORMAL 0 45 #define FRAME_SYNC 1 46 #define FRAME_IRQ 2 47 #define FRAME_SERROR 3 48 #define FRAME_UNHANDLED 4 49 50 void 51 db_md_list_watchpoints(void) 52 { 53 54 dbg_show_watchpoint(); 55 } 56 57 static void __nosanitizeaddress 58 db_stack_trace_cmd(struct thread *td, struct unwind_state *frame) 59 { 60 c_db_sym_t sym; 61 const char *name; 62 db_expr_t value; 63 db_expr_t offset; 64 int frame_type; 65 66 while (1) { 67 sym = db_search_symbol(frame->pc, DB_STGY_ANY, &offset); 68 if (sym == C_DB_SYM_NULL) { 69 value = 0; 70 name = "(null)"; 71 } else 72 db_symbol_values(sym, &name, &value); 73 74 db_printf("%s() at ", name); 75 db_printsym(frame->pc, DB_STGY_PROC); 76 db_printf("\n"); 77 78 if (strcmp(name, "handle_el0_sync") == 0 || 79 strcmp(name, "handle_el1h_sync") == 0) 80 frame_type = FRAME_SYNC; 81 else if (strcmp(name, "handle_el0_irq") == 0 || 82 strcmp(name, "handle_el1h_irq") == 0) 83 frame_type = FRAME_IRQ; 84 else if (strcmp(name, "handle_serror") == 0) 85 frame_type = FRAME_SERROR; 86 else if (strcmp(name, "handle_empty_exception") == 0) 87 frame_type = FRAME_UNHANDLED; 88 else 89 frame_type = FRAME_NORMAL; 90 91 if (frame_type != FRAME_NORMAL) { 92 struct trapframe *tf; 93 94 tf = (struct trapframe *)(uintptr_t)frame->fp - 1; 95 if (!__is_aligned(tf, _Alignof(*tf)) || 96 !kstack_contains(td, (vm_offset_t)tf, 97 sizeof(*tf))) { 98 db_printf("--- invalid trapframe %p\n", tf); 99 break; 100 } 101 102 switch (frame_type) { 103 case FRAME_SYNC: 104 db_printf("--- exception, esr %#lx\n", 105 tf->tf_esr); 106 break; 107 case FRAME_IRQ: 108 db_printf("--- interrupt\n"); 109 break; 110 case FRAME_SERROR: 111 db_printf("--- system error, esr %#lx\n", 112 tf->tf_esr); 113 break; 114 case FRAME_UNHANDLED: 115 db_printf("--- unhandled exception, esr %#lx\n", 116 tf->tf_esr); 117 break; 118 default: 119 __assert_unreachable(); 120 break; 121 } 122 123 frame->fp = tf->tf_x[29]; 124 frame->pc = ADDR_MAKE_CANONICAL(tf->tf_elr); 125 if (!INKERNEL(frame->fp)) 126 break; 127 } else { 128 if (strcmp(name, "fork_trampoline") == 0) 129 break; 130 131 if (!unwind_frame(td, frame)) 132 break; 133 } 134 } 135 } 136 137 int __nosanitizeaddress 138 db_trace_thread(struct thread *thr, int count) 139 { 140 struct unwind_state frame; 141 struct pcb *ctx; 142 143 if (thr != curthread) { 144 ctx = kdb_thr_ctx(thr); 145 146 frame.fp = (uintptr_t)ctx->pcb_x[PCB_FP]; 147 frame.pc = (uintptr_t)ctx->pcb_x[PCB_LR]; 148 db_stack_trace_cmd(thr, &frame); 149 } else 150 db_trace_self(); 151 return (0); 152 } 153 154 void __nosanitizeaddress 155 db_trace_self(void) 156 { 157 struct unwind_state frame; 158 159 frame.fp = (uintptr_t)__builtin_frame_address(0); 160 frame.pc = (uintptr_t)db_trace_self; 161 db_stack_trace_cmd(curthread, &frame); 162 } 163