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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 * Portions Copyright 2016-2018 Ruslan Bukin <br@bsdpad.com> * * $FreeBSD$ */ /* * 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/riscvreg.h> #include <machine/encoding.h> #include "fbt.h" #define FBT_C_PATCHVAL MATCH_C_EBREAK #define FBT_PATCHVAL MATCH_EBREAK #define FBT_ENTRY "entry" #define FBT_RETURN "return" int fbt_invop(uintptr_t addr, struct trapframe *frame, uintptr_t rval) { solaris_cpu_t *cpu; fbt_probe_t *fbt; cpu = &solaris_cpu[curcpu]; fbt = fbt_probetab[FBT_ADDR2NDX(addr)]; for (; fbt != NULL; fbt = fbt->fbtp_hashnext) { if ((uintptr_t)fbt->fbtp_patchpoint == addr) { cpu->cpu_dtrace_caller = addr; if (fbt->fbtp_roffset == 0) { dtrace_probe(fbt->fbtp_id, frame->tf_a[0], frame->tf_a[1], frame->tf_a[2], frame->tf_a[3], frame->tf_a[4]); } else { dtrace_probe(fbt->fbtp_id, fbt->fbtp_roffset, frame->tf_a[0], frame->tf_a[1], 0, 0); } cpu->cpu_dtrace_caller = 0; return (fbt->fbtp_savedval); } } return (0); } void fbt_patch_tracepoint(fbt_probe_t *fbt, fbt_patchval_t val) { switch(fbt->fbtp_patchval) { case FBT_C_PATCHVAL: *(uint16_t *)fbt->fbtp_patchpoint = (uint16_t)val; fence_i(); break; case FBT_PATCHVAL: *fbt->fbtp_patchpoint = val; fence_i(); break; }; } static int match_opcode(uint32_t insn, int match, int mask) { if (((insn ^ match) & mask) == 0) return (1); return (0); } static int check_c_ret(uint32_t **instr) { uint16_t *instr1; int i; for (i = 0; i < 2; i++) { instr1 = (uint16_t *)(*instr) + i; if (match_opcode(*instr1, (MATCH_C_JR | (X_RA << RD_SHIFT)), (MASK_C_JR | RD_MASK))) { *instr = (uint32_t *)instr1; return (1); } } return (0); } static int check_c_sdsp(uint32_t **instr) { uint16_t *instr1; int i; for (i = 0; i < 2; i++) { instr1 = (uint16_t *)(*instr) + i; if (match_opcode(*instr1, (MATCH_C_SDSP | RS2_C_RA), (MASK_C_SDSP | RS2_C_MASK))) { *instr = (uint32_t *)instr1; return (1); } } return (0); } int fbt_provide_module_function(linker_file_t lf, int symindx, linker_symval_t *symval, void *opaque) { fbt_probe_t *fbt, *retfbt; uint32_t *instr, *limit; const char *name; char *modname; int patchval; int rval; modname = opaque; name = symval->name; /* Check if function is excluded from instrumentation */ if (fbt_excluded(name)) return (0); /* * Some assembly-language exception handlers are not suitable for * instrumentation. */ if (strcmp(name, "cpu_exception_handler") == 0) return (0); if (strcmp(name, "cpu_exception_handler_user") == 0) return (0); if (strcmp(name, "cpu_exception_handler_supervisor") == 0) return (0); if (strcmp(name, "do_trap_supervisor") == 0) return (0); instr = (uint32_t *)(symval->value); limit = (uint32_t *)(symval->value + symval->size); /* Look for sd operation */ for (; instr < limit; instr++) { /* Look for a non-compressed store of ra to sp */ if (match_opcode(*instr, (MATCH_SD | RS2_RA | RS1_SP), (MASK_SD | RS2_MASK | RS1_MASK))) { rval = DTRACE_INVOP_SD; patchval = FBT_PATCHVAL; break; } /* Look for a 'C'-compressed store of ra to sp. */ if (check_c_sdsp(&instr)) { rval = DTRACE_INVOP_C_SDSP; patchval = FBT_C_PATCHVAL; break; } } if (instr >= limit) 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, 3, fbt); fbt->fbtp_patchpoint = instr; fbt->fbtp_ctl = lf; fbt->fbtp_loadcnt = lf->loadcnt; fbt->fbtp_savedval = *instr; fbt->fbtp_patchval = patchval; fbt->fbtp_rval = rval; fbt->fbtp_symindx = symindx; fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)]; fbt_probetab[FBT_ADDR2NDX(instr)] = fbt; lf->fbt_nentries++; retfbt = NULL; again: for (; instr < limit; instr++) { /* Look for non-compressed return */ if (match_opcode(*instr, (MATCH_JALR | (X_RA << RS1_SHIFT)), (MASK_JALR | RD_MASK | RS1_MASK | IMM_MASK))) { rval = DTRACE_INVOP_RET; patchval = FBT_PATCHVAL; break; } /* Look for 'C'-compressed return */ if (check_c_ret(&instr)) { rval = DTRACE_INVOP_C_RET; patchval = FBT_C_PATCHVAL; 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, 3, 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; fbt->fbtp_rval = rval; fbt->fbtp_roffset = (uintptr_t)instr - (uintptr_t)symval->value; fbt->fbtp_savedval = *instr; fbt->fbtp_patchval = patchval; fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)]; fbt_probetab[FBT_ADDR2NDX(instr)] = fbt; lf->fbt_nentries++; instr++; goto again; }
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