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fbt_isa.c
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fbt_isa.h
(922 B)
Editing: fbt_isa.c
/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END * * Portions Copyright 2006-2008 John Birrell jb@freebsd.org * Portions Copyright 2013 Justin Hibbits jhibbits@freebsd.org * Portions Copyright 2013 Howard Su howardsu@freebsd.org * * $FreeBSD$ * */ /* * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #include <sys/cdefs.h> #include <sys/param.h> #include <sys/dtrace.h> #include <machine/stack.h> #include <machine/trap.h> #include "fbt.h" #define FBT_PUSHM 0xe92d0000 #define FBT_POPM 0xe8bd0000 #define FBT_JUMP 0xea000000 #define FBT_SUBSP 0xe24dd000 #define FBT_ENTRY "entry" #define FBT_RETURN "return" int fbt_invop(uintptr_t addr, struct trapframe *frame, uintptr_t rval) { solaris_cpu_t *cpu = &solaris_cpu[curcpu]; fbt_probe_t *fbt = fbt_probetab[FBT_ADDR2NDX(addr)]; register_t fifthparam; for (; fbt != NULL; fbt = fbt->fbtp_hashnext) { if ((uintptr_t)fbt->fbtp_patchpoint != addr) continue; cpu->cpu_dtrace_caller = addr; if (fbt->fbtp_roffset == 0) { /* Get 5th parameter from stack */ DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT); fifthparam = *(register_t *)frame->tf_svc_sp; DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT | CPU_DTRACE_BADADDR); dtrace_probe(fbt->fbtp_id, frame->tf_r0, frame->tf_r1, frame->tf_r2, frame->tf_r3, fifthparam); } else { dtrace_probe(fbt->fbtp_id, fbt->fbtp_roffset, rval, 0, 0, 0); } cpu->cpu_dtrace_caller = 0; return (fbt->fbtp_rval | (fbt->fbtp_savedval << DTRACE_INVOP_SHIFT)); } return (0); } void fbt_patch_tracepoint(fbt_probe_t *fbt, fbt_patchval_t val) { *fbt->fbtp_patchpoint = val; icache_sync((vm_offset_t)fbt->fbtp_patchpoint, sizeof(val)); } int fbt_provide_module_function(linker_file_t lf, int symindx, linker_symval_t *symval, void *opaque) { char *modname = opaque; const char *name = symval->name; fbt_probe_t *fbt, *retfbt; uint32_t *instr, *limit; int popm; if (fbt_excluded(name)) return (0); instr = (uint32_t *)symval->value; limit = (uint32_t *)(symval->value + symval->size); /* * va_arg functions has first instruction of * sub sp, sp, #? */ if ((*instr & 0xfffff000) == FBT_SUBSP) instr++; /* * check if insn is a pushm with LR */ if ((*instr & 0xffff0000) != FBT_PUSHM || (*instr & (1 << LR)) == 0) return (0); fbt = malloc(sizeof (fbt_probe_t), M_FBT, M_WAITOK | M_ZERO); fbt->fbtp_name = name; fbt->fbtp_id = dtrace_probe_create(fbt_id, modname, name, FBT_ENTRY, 2, fbt); fbt->fbtp_patchpoint = instr; fbt->fbtp_ctl = lf; fbt->fbtp_loadcnt = lf->loadcnt; fbt->fbtp_savedval = *instr; fbt->fbtp_patchval = FBT_BREAKPOINT; fbt->fbtp_rval = DTRACE_INVOP_PUSHM; fbt->fbtp_symindx = symindx; fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)]; fbt_probetab[FBT_ADDR2NDX(instr)] = fbt; lf->fbt_nentries++; popm = FBT_POPM | ((*instr) & 0x3FFF) | 0x8000; retfbt = NULL; again: for (; instr < limit; instr++) { if (*instr == popm) break; else if ((*instr & 0xff000000) == FBT_JUMP) { uint32_t *target, *start; int offset; offset = (*instr & 0xffffff); offset <<= 8; offset /= 64; target = instr + (2 + offset); start = (uint32_t *)symval->value; if (target >= limit || target < start) break; } } if (instr >= limit) return (0); /* * We have a winner! */ fbt = malloc(sizeof (fbt_probe_t), M_FBT, M_WAITOK | M_ZERO); fbt->fbtp_name = name; if (retfbt == NULL) { fbt->fbtp_id = dtrace_probe_create(fbt_id, modname, name, FBT_RETURN, 2, fbt); } else { retfbt->fbtp_probenext = fbt; fbt->fbtp_id = retfbt->fbtp_id; } retfbt = fbt; fbt->fbtp_patchpoint = instr; fbt->fbtp_ctl = lf; fbt->fbtp_loadcnt = lf->loadcnt; fbt->fbtp_symindx = symindx; if ((*instr & 0xff000000) == FBT_JUMP) fbt->fbtp_rval = DTRACE_INVOP_B; else fbt->fbtp_rval = DTRACE_INVOP_POPM; fbt->fbtp_roffset = (uintptr_t)instr - (uintptr_t)symval->value; fbt->fbtp_savedval = *instr; fbt->fbtp_patchval = FBT_BREAKPOINT; fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)]; fbt_probetab[FBT_ADDR2NDX(instr)] = fbt; lf->fbt_nentries++; instr++; goto again; }
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