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 */ 26 27 /* 28 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 29 * Use is subject to license terms. 30 */ 31 32 #include <sys/param.h> 33 34 #include <sys/dtrace.h> 35 #include <machine/stack.h> 36 #include <machine/trap.h> 37 38 #include "fbt.h" 39 40 #define FBT_PUSHM 0xe92d0000 41 #define FBT_POPM 0xe8bd0000 42 #define FBT_JUMP 0xea000000 43 #define FBT_SUBSP 0xe24dd000 44 45 int 46 fbt_invop(uintptr_t addr, struct trapframe *frame, uintptr_t rval) 47 { 48 solaris_cpu_t *cpu = &solaris_cpu[curcpu]; 49 fbt_probe_t *fbt = fbt_probetab[FBT_ADDR2NDX(addr)]; 50 register_t fifthparam; 51 52 for (; fbt != NULL; fbt = fbt->fbtp_hashnext) { 53 if ((uintptr_t)fbt->fbtp_patchpoint != addr) 54 continue; 55 56 cpu->cpu_dtrace_caller = addr; 57 58 if (fbt->fbtp_roffset == 0) { 59 /* Get 5th parameter from stack */ 60 DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT); 61 fifthparam = *(register_t *)frame->tf_svc_sp; 62 DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT | CPU_DTRACE_BADADDR); 63 64 dtrace_probe(fbt->fbtp_id, frame->tf_r0, 65 frame->tf_r1, frame->tf_r2, 66 frame->tf_r3, fifthparam); 67 } else { 68 dtrace_probe(fbt->fbtp_id, fbt->fbtp_roffset, rval, 69 0, 0, 0); 70 } 71 72 cpu->cpu_dtrace_caller = 0; 73 return (fbt->fbtp_rval | (fbt->fbtp_savedval << DTRACE_INVOP_SHIFT)); 74 } 75 76 return (0); 77 } 78 79 void 80 fbt_patch_tracepoint(fbt_probe_t *fbt, fbt_patchval_t val) 81 { 82 83 *fbt->fbtp_patchpoint = val; 84 icache_sync((vm_offset_t)fbt->fbtp_patchpoint, sizeof(val)); 85 } 86 87 int 88 fbt_provide_module_function(linker_file_t lf, int symindx, 89 linker_symval_t *symval, void *opaque) 90 { 91 char *modname = opaque; 92 const char *name = symval->name; 93 fbt_probe_t *fbt, *retfbt; 94 uint32_t *instr, *limit; 95 int popm; 96 97 if (fbt_excluded(name)) 98 return (0); 99 100 instr = (uint32_t *)symval->value; 101 limit = (uint32_t *)(symval->value + symval->size); 102 103 /* 104 * va_arg functions has first instruction of 105 * sub sp, sp, #? 106 */ 107 if ((*instr & 0xfffff000) == FBT_SUBSP) 108 instr++; 109 110 /* 111 * check if insn is a pushm with LR 112 */ 113 if ((*instr & 0xffff0000) != FBT_PUSHM || 114 (*instr & (1 << LR)) == 0) 115 return (0); 116 117 fbt = malloc(sizeof (fbt_probe_t), M_FBT, M_WAITOK | M_ZERO); 118 fbt->fbtp_name = name; 119 fbt->fbtp_id = dtrace_probe_create(fbt_id, modname, 120 name, FBT_ENTRY, 2, fbt); 121 fbt->fbtp_patchpoint = instr; 122 fbt->fbtp_ctl = lf; 123 fbt->fbtp_loadcnt = lf->loadcnt; 124 fbt->fbtp_savedval = *instr; 125 fbt->fbtp_patchval = FBT_BREAKPOINT; 126 fbt->fbtp_rval = DTRACE_INVOP_PUSHM; 127 fbt->fbtp_symindx = symindx; 128 129 fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)]; 130 fbt_probetab[FBT_ADDR2NDX(instr)] = fbt; 131 132 lf->fbt_nentries++; 133 134 popm = FBT_POPM | ((*instr) & 0x3FFF) | 0x8000; 135 136 retfbt = NULL; 137 again: 138 for (; instr < limit; instr++) { 139 if (*instr == popm) 140 break; 141 else if ((*instr & 0xff000000) == FBT_JUMP) { 142 uint32_t *target, *start; 143 int offset; 144 145 offset = (*instr & 0xffffff); 146 offset <<= 8; 147 offset /= 64; 148 target = instr + (2 + offset); 149 start = (uint32_t *)symval->value; 150 if (target >= limit || target < start) 151 break; 152 } 153 } 154 155 if (instr >= limit) 156 return (0); 157 158 /* 159 * We have a winner! 160 */ 161 fbt = malloc(sizeof (fbt_probe_t), M_FBT, M_WAITOK | M_ZERO); 162 fbt->fbtp_name = name; 163 if (retfbt == NULL) { 164 fbt->fbtp_id = dtrace_probe_create(fbt_id, modname, 165 name, FBT_RETURN, 2, fbt); 166 } else { 167 retfbt->fbtp_probenext = fbt; 168 fbt->fbtp_id = retfbt->fbtp_id; 169 } 170 retfbt = fbt; 171 172 fbt->fbtp_patchpoint = instr; 173 fbt->fbtp_ctl = lf; 174 fbt->fbtp_loadcnt = lf->loadcnt; 175 fbt->fbtp_symindx = symindx; 176 if ((*instr & 0xff000000) == FBT_JUMP) 177 fbt->fbtp_rval = DTRACE_INVOP_B; 178 else 179 fbt->fbtp_rval = DTRACE_INVOP_POPM; 180 fbt->fbtp_roffset = (uintptr_t)instr - (uintptr_t)symval->value; 181 fbt->fbtp_savedval = *instr; 182 fbt->fbtp_patchval = FBT_BREAKPOINT; 183 fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)]; 184 fbt_probetab[FBT_ADDR2NDX(instr)] = fbt; 185 186 lf->fbt_nentries++; 187 188 instr++; 189 goto again; 190 } 191