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_breakpoints(void) 52 { 53 54 dbg_show_breakpoint(); 55 } 56 57 void 58 db_md_list_watchpoints(void) 59 { 60 61 dbg_show_watchpoint(); 62 } 63 64 static void __nosanitizeaddress 65 db_stack_trace_cmd(struct thread *td, struct unwind_state *frame) 66 { 67 c_db_sym_t sym; 68 const char *name; 69 db_expr_t value; 70 db_expr_t offset; 71 int frame_type; 72 73 while (1) { 74 sym = db_search_symbol(frame->pc, DB_STGY_ANY, &offset); 75 if (sym == C_DB_SYM_NULL) { 76 value = 0; 77 name = "(null)"; 78 } else 79 db_symbol_values(sym, &name, &value); 80 81 db_printf("%s() at ", name); 82 db_printsym(frame->pc, DB_STGY_PROC); 83 db_printf("\n"); 84 85 if (strcmp(name, "handle_el0_sync") == 0 || 86 strcmp(name, "handle_el1h_sync") == 0) 87 frame_type = FRAME_SYNC; 88 else if (strcmp(name, "handle_el0_irq") == 0 || 89 strcmp(name, "handle_el1h_irq") == 0) 90 frame_type = FRAME_IRQ; 91 else if (strcmp(name, "handle_serror") == 0) 92 frame_type = FRAME_SERROR; 93 else if (strcmp(name, "handle_empty_exception") == 0) 94 frame_type = FRAME_UNHANDLED; 95 else 96 frame_type = FRAME_NORMAL; 97 98 if (frame_type != FRAME_NORMAL) { 99 struct trapframe *tf; 100 101 tf = (struct trapframe *)(uintptr_t)frame->fp - 1; 102 if (!__is_aligned(tf, _Alignof(struct trapframe)) || 103 !kstack_contains(td, (vm_offset_t)tf, 104 sizeof(*tf))) { 105 db_printf("--- invalid trapframe %p\n", tf); 106 break; 107 } 108 109 switch (frame_type) { 110 case FRAME_SYNC: 111 db_printf("--- exception, esr %#lx\n", 112 tf->tf_esr); 113 break; 114 case FRAME_IRQ: 115 db_printf("--- interrupt\n"); 116 break; 117 case FRAME_SERROR: 118 db_printf("--- system error, esr %#lx\n", 119 tf->tf_esr); 120 break; 121 case FRAME_UNHANDLED: 122 db_printf("--- unhandled exception, esr %#lx\n", 123 tf->tf_esr); 124 break; 125 default: 126 __assert_unreachable(); 127 break; 128 } 129 130 frame->fp = tf->tf_x[29]; 131 frame->pc = ADDR_MAKE_CANONICAL(tf->tf_elr); 132 if (!INKERNEL(frame->fp)) 133 break; 134 } else { 135 if (strcmp(name, "fork_trampoline") == 0) 136 break; 137 138 if (!unwind_frame(td, frame)) 139 break; 140 } 141 } 142 } 143 144 int __nosanitizeaddress 145 db_trace_thread(struct thread *thr, int count) 146 { 147 struct unwind_state frame; 148 struct pcb *ctx; 149 150 if (thr != curthread) { 151 ctx = kdb_thr_ctx(thr); 152 153 frame.fp = (uintptr_t)ctx->pcb_x[PCB_FP]; 154 frame.pc = (uintptr_t)ctx->pcb_x[PCB_LR]; 155 db_stack_trace_cmd(thr, &frame); 156 } else 157 db_trace_self(); 158 return (0); 159 } 160 161 void __nosanitizeaddress 162 db_trace_self(void) 163 { 164 struct unwind_state frame; 165 166 frame.fp = (uintptr_t)__builtin_frame_address(0); 167 frame.pc = (uintptr_t)db_trace_self; 168 db_stack_trace_cmd(curthread, &frame); 169 } 170