1 /*- 2 * Copyright (c) 2015 The FreeBSD Foundation 3 * Copyright (c) 2016 Ruslan Bukin <br@bsdpad.com> 4 * All rights reserved. 5 * Copyright (c) 2020 John Baldwin <jhb@FreeBSD.org> 6 * 7 * Portions of this software were developed by Semihalf under 8 * the sponsorship of the FreeBSD Foundation. 9 * 10 * Portions of this software were developed by SRI International and the 11 * University of Cambridge Computer Laboratory under DARPA/AFRL contract 12 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme. 13 * 14 * Portions of this software were developed by the University of Cambridge 15 * Computer Laboratory as part of the CTSRD Project, with support from the 16 * UK Higher Education Innovation Fund (HEIF). 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions 20 * are met: 21 * 1. Redistributions of source code must retain the above copyright 22 * notice, this list of conditions and the following disclaimer. 23 * 2. Redistributions in binary form must reproduce the above copyright 24 * notice, this list of conditions and the following disclaimer in the 25 * documentation and/or other materials provided with the distribution. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include <sys/param.h> 44 #include <sys/kdb.h> 45 #include <sys/proc.h> 46 47 #include <ddb/ddb.h> 48 #include <ddb/db_sym.h> 49 50 #include <machine/pcb.h> 51 #include <machine/riscvreg.h> 52 #include <machine/stack.h> 53 #include <machine/vmparam.h> 54 55 void 56 db_md_list_watchpoints(void) 57 { 58 59 } 60 61 static void 62 db_stack_trace_cmd(struct thread *td, struct unwind_state *frame) 63 { 64 const char *name; 65 db_expr_t offset; 66 db_expr_t value; 67 c_db_sym_t sym; 68 uint64_t pc; 69 70 while (1) { 71 pc = frame->pc; 72 73 sym = db_search_symbol(pc, DB_STGY_ANY, &offset); 74 if (sym == C_DB_SYM_NULL) { 75 value = 0; 76 name = "(null)"; 77 } else 78 db_symbol_values(sym, &name, &value); 79 80 db_printf("%s() at ", name); 81 db_printsym(frame->pc, DB_STGY_PROC); 82 db_printf("\n"); 83 84 if (strcmp(name, "cpu_exception_handler_supervisor") == 0 || 85 strcmp(name, "cpu_exception_handler_user") == 0) { 86 struct trapframe *tf; 87 88 tf = (struct trapframe *)(uintptr_t)frame->sp; 89 if (!kstack_contains(td, (vm_offset_t)tf, 90 sizeof(*tf))) { 91 db_printf("--- invalid trapframe %p\n", tf); 92 break; 93 } 94 95 if ((tf->tf_scause & SCAUSE_INTR) != 0) 96 db_printf("--- interrupt %ld\n", 97 tf->tf_scause & SCAUSE_CODE); 98 else 99 db_printf("--- exception %ld, tval = %#lx\n", 100 tf->tf_scause & SCAUSE_CODE, 101 tf->tf_stval); 102 frame->sp = tf->tf_sp; 103 frame->fp = tf->tf_s[0]; 104 frame->pc = tf->tf_sepc; 105 if (!INKERNEL(frame->fp)) 106 break; 107 continue; 108 } 109 110 if (strcmp(name, "fork_trampoline") == 0) 111 break; 112 113 if (!unwind_frame(td, frame)) 114 break; 115 } 116 } 117 118 int 119 db_trace_thread(struct thread *thr, int count) 120 { 121 struct unwind_state frame; 122 struct pcb *ctx; 123 124 ctx = kdb_thr_ctx(thr); 125 126 frame.sp = ctx->pcb_sp; 127 frame.fp = ctx->pcb_s[0]; 128 frame.pc = ctx->pcb_ra; 129 db_stack_trace_cmd(thr, &frame); 130 return (0); 131 } 132 133 void 134 db_trace_self(void) 135 { 136 struct unwind_state frame; 137 uintptr_t sp; 138 139 __asm __volatile("mv %0, sp" : "=&r" (sp)); 140 141 frame.sp = sp; 142 frame.fp = (uintptr_t)__builtin_frame_address(0); 143 frame.pc = (uintptr_t)db_trace_self; 144 db_stack_trace_cmd(curthread, &frame); 145 } 146