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 int 49 fbt_invop(uintptr_t addr, struct trapframe *frame, uintptr_t rval) 50 { 51 solaris_cpu_t *cpu = &solaris_cpu[curcpu]; 52 fbt_probe_t *fbt = fbt_probetab[FBT_ADDR2NDX(addr)]; 53 register_t fifthparam; 54 55 for (; fbt != NULL; fbt = fbt->fbtp_hashnext) { 56 if ((uintptr_t)fbt->fbtp_patchpoint != addr) 57 continue; 58 59 cpu->cpu_dtrace_caller = addr; 60 61 if (fbt->fbtp_roffset == 0) { 62 /* Get 5th parameter from stack */ 63 DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT); 64 fifthparam = *(register_t *)frame->tf_svc_sp; 65 DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT | CPU_DTRACE_BADADDR); 66 67 dtrace_probe(fbt->fbtp_id, frame->tf_r0, 68 frame->tf_r1, frame->tf_r2, 69 frame->tf_r3, fifthparam); 70 } else { 71 dtrace_probe(fbt->fbtp_id, fbt->fbtp_roffset, rval, 72 0, 0, 0); 73 } 74 75 cpu->cpu_dtrace_caller = 0; 76 return (fbt->fbtp_rval | (fbt->fbtp_savedval << DTRACE_INVOP_SHIFT)); 77 } 78 79 return (0); 80 } 81 82 void 83 fbt_patch_tracepoint(fbt_probe_t *fbt, fbt_patchval_t val) 84 { 85 86 *fbt->fbtp_patchpoint = val; 87 icache_sync((vm_offset_t)fbt->fbtp_patchpoint, sizeof(val)); 88 } 89 90 int 91 fbt_provide_module_function(linker_file_t lf, int symindx, 92 linker_symval_t *symval, void *opaque) 93 { 94 char *modname = opaque; 95 const char *name = symval->name; 96 fbt_probe_t *fbt, *retfbt; 97 uint32_t *instr, *limit; 98 int popm; 99 100 if (fbt_excluded(name)) 101 return (0); 102 103 instr = (uint32_t *)symval->value; 104 limit = (uint32_t *)(symval->value + symval->size); 105 106 /* 107 * va_arg functions has first instruction of 108 * sub sp, sp, #? 109 */ 110 if ((*instr & 0xfffff000) == FBT_SUBSP) 111 instr++; 112 113 /* 114 * check if insn is a pushm with LR 115 */ 116 if ((*instr & 0xffff0000) != FBT_PUSHM || 117 (*instr & (1 << LR)) == 0) 118 return (0); 119 120 fbt = malloc(sizeof (fbt_probe_t), M_FBT, M_WAITOK | M_ZERO); 121 fbt->fbtp_name = name; 122 fbt->fbtp_id = dtrace_probe_create(fbt_id, modname, 123 name, FBT_ENTRY, 2, fbt); 124 fbt->fbtp_patchpoint = instr; 125 fbt->fbtp_ctl = lf; 126 fbt->fbtp_loadcnt = lf->loadcnt; 127 fbt->fbtp_savedval = *instr; 128 fbt->fbtp_patchval = FBT_BREAKPOINT; 129 fbt->fbtp_rval = DTRACE_INVOP_PUSHM; 130 fbt->fbtp_symindx = symindx; 131 132 fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)]; 133 fbt_probetab[FBT_ADDR2NDX(instr)] = fbt; 134 135 lf->fbt_nentries++; 136 137 popm = FBT_POPM | ((*instr) & 0x3FFF) | 0x8000; 138 139 retfbt = NULL; 140 again: 141 for (; instr < limit; instr++) { 142 if (*instr == popm) 143 break; 144 else if ((*instr & 0xff000000) == FBT_JUMP) { 145 uint32_t *target, *start; 146 int offset; 147 148 offset = (*instr & 0xffffff); 149 offset <<= 8; 150 offset /= 64; 151 target = instr + (2 + offset); 152 start = (uint32_t *)symval->value; 153 if (target >= limit || target < start) 154 break; 155 } 156 } 157 158 if (instr >= limit) 159 return (0); 160 161 /* 162 * We have a winner! 163 */ 164 fbt = malloc(sizeof (fbt_probe_t), M_FBT, M_WAITOK | M_ZERO); 165 fbt->fbtp_name = name; 166 if (retfbt == NULL) { 167 fbt->fbtp_id = dtrace_probe_create(fbt_id, modname, 168 name, FBT_RETURN, 2, fbt); 169 } else { 170 retfbt->fbtp_probenext = fbt; 171 fbt->fbtp_id = retfbt->fbtp_id; 172 } 173 retfbt = fbt; 174 175 fbt->fbtp_patchpoint = instr; 176 fbt->fbtp_ctl = lf; 177 fbt->fbtp_loadcnt = lf->loadcnt; 178 fbt->fbtp_symindx = symindx; 179 if ((*instr & 0xff000000) == FBT_JUMP) 180 fbt->fbtp_rval = DTRACE_INVOP_B; 181 else 182 fbt->fbtp_rval = DTRACE_INVOP_POPM; 183 fbt->fbtp_roffset = (uintptr_t)instr - (uintptr_t)symval->value; 184 fbt->fbtp_savedval = *instr; 185 fbt->fbtp_patchval = FBT_BREAKPOINT; 186 fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)]; 187 fbt_probetab[FBT_ADDR2NDX(instr)] = fbt; 188 189 lf->fbt_nentries++; 190 191 instr++; 192 goto again; 193 } 194