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() 57 { 58 59 } 60 61 int 62 db_md_clr_watchpoint(db_expr_t addr, db_expr_t size) 63 { 64 65 return (0); 66 } 67 68 int 69 db_md_set_watchpoint(db_expr_t addr, db_expr_t size) 70 { 71 72 return (0); 73 } 74 75 static void 76 db_stack_trace_cmd(struct unwind_state *frame) 77 { 78 const char *name; 79 db_expr_t offset; 80 db_expr_t value; 81 c_db_sym_t sym; 82 uint64_t pc; 83 84 while (1) { 85 pc = frame->pc; 86 87 sym = db_search_symbol(pc, DB_STGY_ANY, &offset); 88 if (sym == C_DB_SYM_NULL) { 89 value = 0; 90 name = "(null)"; 91 } else 92 db_symbol_values(sym, &name, &value); 93 94 db_printf("%s() at ", name); 95 db_printsym(frame->pc, DB_STGY_PROC); 96 db_printf("\n"); 97 98 if (strcmp(name, "cpu_exception_handler_supervisor") == 0 || 99 strcmp(name, "cpu_exception_handler_user") == 0) { 100 struct trapframe *tf; 101 102 tf = (struct trapframe *)(uintptr_t)frame->sp; 103 104 if (tf->tf_scause & EXCP_INTR) 105 db_printf("--- interrupt %ld\n", 106 tf->tf_scause & EXCP_MASK); 107 else 108 db_printf("--- exception %ld, tval = %#lx\n", 109 tf->tf_scause & EXCP_MASK, 110 tf->tf_stval); 111 frame->sp = (uint64_t)tf->tf_sp; 112 frame->fp = (uint64_t)tf->tf_s[0]; 113 frame->pc = (uint64_t)tf->tf_sepc; 114 if (!INKERNEL(frame->fp)) 115 break; 116 continue; 117 } 118 119 if (strcmp(name, "fork_trampoline") == 0) 120 break; 121 122 if (unwind_frame(frame) < 0) 123 break; 124 } 125 } 126 127 int 128 db_trace_thread(struct thread *thr, int count) 129 { 130 struct unwind_state frame; 131 struct pcb *ctx; 132 133 ctx = kdb_thr_ctx(thr); 134 135 frame.sp = (uint64_t)ctx->pcb_sp; 136 frame.fp = (uint64_t)ctx->pcb_s[0]; 137 frame.pc = (uint64_t)ctx->pcb_ra; 138 db_stack_trace_cmd(&frame); 139 return (0); 140 } 141 142 void 143 db_trace_self(void) 144 { 145 struct unwind_state frame; 146 uint64_t sp; 147 148 __asm __volatile("mv %0, sp" : "=&r" (sp)); 149 150 frame.sp = sp; 151 frame.fp = (uint64_t)__builtin_frame_address(0); 152 frame.pc = (uint64_t)db_trace_self; 153 db_stack_trace_cmd(&frame); 154 } 155