1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 * 21 * Portions Copyright 2006-2008 John Birrell jb@freebsd.org 22 * Portions Copyright 2013 Justin Hibbits jhibbits@freebsd.org 23 * Portions Copyright 2013 Howard Su howardsu@freebsd.org 24 * 25 * $FreeBSD$ 26 * 27 */ 28 29 /* 30 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 31 * Use is subject to license terms. 32 */ 33 34 #include <sys/cdefs.h> 35 #include <sys/param.h> 36 37 #include <sys/dtrace.h> 38 #include <machine/stack.h> 39 #include <machine/trap.h> 40 41 #include "fbt.h" 42 43 #define FBT_PUSHM 0xe92d0000 44 #define FBT_POPM 0xe8bd0000 45 #define FBT_JUMP 0xea000000 46 #define FBT_SUBSP 0xe24dd000 47 48 #define FBT_ENTRY "entry" 49 #define FBT_RETURN "return" 50 51 int 52 fbt_invop(uintptr_t addr, struct trapframe *frame, uintptr_t rval) 53 { 54 solaris_cpu_t *cpu = &solaris_cpu[curcpu]; 55 fbt_probe_t *fbt = fbt_probetab[FBT_ADDR2NDX(addr)]; 56 register_t fifthparam; 57 58 for (; fbt != NULL; fbt = fbt->fbtp_hashnext) { 59 if ((uintptr_t)fbt->fbtp_patchpoint != addr) 60 continue; 61 62 cpu->cpu_dtrace_caller = addr; 63 64 if (fbt->fbtp_roffset == 0) { 65 /* Get 5th parameter from stack */ 66 DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT); 67 fifthparam = *(register_t *)frame->tf_svc_sp; 68 DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT | CPU_DTRACE_BADADDR); 69 70 dtrace_probe(fbt->fbtp_id, frame->tf_r0, 71 frame->tf_r1, frame->tf_r2, 72 frame->tf_r3, fifthparam); 73 } else { 74 dtrace_probe(fbt->fbtp_id, fbt->fbtp_roffset, rval, 75 0, 0, 0); 76 } 77 78 cpu->cpu_dtrace_caller = 0; 79 return (fbt->fbtp_rval | (fbt->fbtp_savedval << DTRACE_INVOP_SHIFT)); 80 } 81 82 return (0); 83 } 84 85 void 86 fbt_patch_tracepoint(fbt_probe_t *fbt, fbt_patchval_t val) 87 { 88 89 *fbt->fbtp_patchpoint = val; 90 icache_sync((vm_offset_t)fbt->fbtp_patchpoint, sizeof(val)); 91 } 92 93 int 94 fbt_provide_module_function(linker_file_t lf, int symindx, 95 linker_symval_t *symval, void *opaque) 96 { 97 char *modname = opaque; 98 const char *name = symval->name; 99 fbt_probe_t *fbt, *retfbt; 100 uint32_t *instr, *limit; 101 int popm; 102 103 if (fbt_excluded(name)) 104 return (0); 105 106 instr = (uint32_t *)symval->value; 107 limit = (uint32_t *)(symval->value + symval->size); 108 109 /* 110 * va_arg functions has first instruction of 111 * sub sp, sp, #? 112 */ 113 if ((*instr & 0xfffff000) == FBT_SUBSP) 114 instr++; 115 116 /* 117 * check if insn is a pushm with LR 118 */ 119 if ((*instr & 0xffff0000) != FBT_PUSHM || 120 (*instr & (1 << LR)) == 0) 121 return (0); 122 123 fbt = malloc(sizeof (fbt_probe_t), M_FBT, M_WAITOK | M_ZERO); 124 fbt->fbtp_name = name; 125 fbt->fbtp_id = dtrace_probe_create(fbt_id, modname, 126 name, FBT_ENTRY, 2, fbt); 127 fbt->fbtp_patchpoint = instr; 128 fbt->fbtp_ctl = lf; 129 fbt->fbtp_loadcnt = lf->loadcnt; 130 fbt->fbtp_savedval = *instr; 131 fbt->fbtp_patchval = FBT_BREAKPOINT; 132 fbt->fbtp_rval = DTRACE_INVOP_PUSHM; 133 fbt->fbtp_symindx = symindx; 134 135 fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)]; 136 fbt_probetab[FBT_ADDR2NDX(instr)] = fbt; 137 138 lf->fbt_nentries++; 139 140 popm = FBT_POPM | ((*instr) & 0x3FFF) | 0x8000; 141 142 retfbt = NULL; 143 again: 144 for (; instr < limit; instr++) { 145 if (*instr == popm) 146 break; 147 else if ((*instr & 0xff000000) == FBT_JUMP) { 148 uint32_t *target, *start; 149 int offset; 150 151 offset = (*instr & 0xffffff); 152 offset <<= 8; 153 offset /= 64; 154 target = instr + (2 + offset); 155 start = (uint32_t *)symval->value; 156 if (target >= limit || target < start) 157 break; 158 } 159 } 160 161 if (instr >= limit) 162 return (0); 163 164 /* 165 * We have a winner! 166 */ 167 fbt = malloc(sizeof (fbt_probe_t), M_FBT, M_WAITOK | M_ZERO); 168 fbt->fbtp_name = name; 169 if (retfbt == NULL) { 170 fbt->fbtp_id = dtrace_probe_create(fbt_id, modname, 171 name, FBT_RETURN, 2, fbt); 172 } else { 173 retfbt->fbtp_probenext = fbt; 174 fbt->fbtp_id = retfbt->fbtp_id; 175 } 176 retfbt = fbt; 177 178 fbt->fbtp_patchpoint = instr; 179 fbt->fbtp_ctl = lf; 180 fbt->fbtp_loadcnt = lf->loadcnt; 181 fbt->fbtp_symindx = symindx; 182 if ((*instr & 0xff000000) == FBT_JUMP) 183 fbt->fbtp_rval = DTRACE_INVOP_B; 184 else 185 fbt->fbtp_rval = DTRACE_INVOP_POPM; 186 fbt->fbtp_roffset = (uintptr_t)instr - (uintptr_t)symval->value; 187 fbt->fbtp_savedval = *instr; 188 fbt->fbtp_patchval = FBT_BREAKPOINT; 189 fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)]; 190 fbt_probetab[FBT_ADDR2NDX(instr)] = fbt; 191 192 lf->fbt_nentries++; 193 194 instr++; 195 goto again; 196 } 197