From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 32162 invoked by alias); 6 Dec 2011 00:54:50 -0000 Received: (qmail 32151 invoked by uid 22791); 6 Dec 2011 00:54:48 -0000 X-SWARE-Spam-Status: No, hits=-2.6 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,RCVD_IN_DNSWL_LOW,TW_CN X-Spam-Check-By: sourceware.org Received: from mail-ee0-f41.google.com (HELO mail-ee0-f41.google.com) (74.125.83.41) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Tue, 06 Dec 2011 00:54:34 +0000 Received: by eekd1 with SMTP id d1so856373eek.0 for ; Mon, 05 Dec 2011 16:54:32 -0800 (PST) Received: by 10.14.14.80 with SMTP id c56mr1613257eec.197.1323132872487; Mon, 05 Dec 2011 16:54:32 -0800 (PST) Received: from localhost.localdomain (plane06.yandex.ru. [178.154.200.208]) by mx.google.com with ESMTPS id cc2sm31923903bkb.8.2011.12.05.16.54.30 (version=TLSv1/SSLv3 cipher=OTHER); Mon, 05 Dec 2011 16:54:31 -0800 (PST) From: Valery Khromov To: gdb-patches@sourceware.org Cc: Valery Khromov Subject: [PATCH] Fix PR gdb/12953: No hardware watchpoints on FreeBSD amd64 Date: Tue, 06 Dec 2011 02:41:00 -0000 Message-Id: <1323132864-14029-1-git-send-email-valery.khromov@gmail.com> Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org X-SW-Source: 2011-12/txt/msg00159.txt.bz2 This patch provides hardware breakpoint/watchpoint support for FreeBSD/AMD64. Most of the code is borrowed from the i386 implementation. gdb/ChangeLog: 2011-12-05 Valery Khromov PR gdb/12953 * Makefile.in (HFILES_NO_SRCDIR): Add amd64bsd-nat.h. * amd64bsd-nat.c: Add support for debug registers (adapted from i386bsd-nat.c). [HAVE_PT_GETDBREGS] (DBREG_DRX): Define if not already defined. [HAVE_PT_GETDBREGS] (amd64bsd_dr_set, amd64bsd_dr_set_control, amd64bsd_dr_set_addr, amd64bsd_dr_reset_addr, amd64bsd_dr_get_status): New functions. * amd64bsd-nat.h: New file (adapted from i386bsd-nat.h). * amd64fbsd-nat.c: Include "amd64bsd-nat.h", "i386-nat.h". [HAVE_PT_GETDBREGS] (_initialize_amd64fbsd_nat): Add hardware watchpoints initialization. * config/i386/fbsd64.mh (NATDEPFILES): Add i386-nat.o. diff --git a/gdb/Makefile.in b/gdb/Makefile.in index 7db23a7..a0d3010 100644 --- a/gdb/Makefile.in +++ b/gdb/Makefile.in @@ -758,7 +758,7 @@ osf-share/cma_stack_int.h osf-share/cma_init.h \ osf-share/cma_deb_core.h osf-share/AT386/cma_thread_io.h \ osf-share/cma_sched.h proc-utils.h arm-tdep.h ax-gdb.h ppcnbsd-tdep.h \ cli-out.h gdb_expat.h breakpoint.h infcall.h obsd-tdep.h \ -exec.h m32r-tdep.h osabi.h gdbcore.h solib-som.h \ +exec.h m32r-tdep.h osabi.h gdbcore.h solib-som.h amd64bsd-nat.h \ i386bsd-nat.h xml-support.h xml-tdesc.h alphabsd-tdep.h gdb_obstack.h \ ia64-tdep.h ada-lang.h varobj.h frv-tdep.h nto-tdep.h serial.h \ c-lang.h d-lang.h frame.h event-loop.h block.h cli/cli-setshow.h \ diff --git a/gdb/amd64bsd-nat.c b/gdb/amd64bsd-nat.c index 7821f2b..8b2f678 100644 --- a/gdb/amd64bsd-nat.c +++ b/gdb/amd64bsd-nat.c @@ -126,3 +126,80 @@ amd64bsd_target (void) t->to_store_registers = amd64bsd_store_inferior_registers; return t; } + + +/* Support for debug registers. */ + +#ifdef HAVE_PT_GETDBREGS + +/* Not all versions of FreeBSD/amd64 that support the debug registers + have this macro. */ +#ifndef DBREG_DRX +#define DBREG_DRX(d, x) ((&d->dr0)[x]) +#endif + +static void +amd64bsd_dr_set (int regnum, unsigned long value) +{ + struct dbreg dbregs; + + if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid), + (PTRACE_TYPE_ARG3) &dbregs, 0) == -1) + perror_with_name (_("Couldn't get debug registers")); + + /* For some mysterious reason, some of the reserved bits in the + debug control register get set. Mask these off, otherwise the + ptrace call below will fail. */ + DBREG_DRX ((&dbregs), 7) &= ~(0xffffffff0000fc00); + + DBREG_DRX ((&dbregs), regnum) = value; + + if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid), + (PTRACE_TYPE_ARG3) &dbregs, 0) == -1) + perror_with_name (_("Couldn't write debug registers")); +} + +void +amd64bsd_dr_set_control (unsigned long control) +{ + amd64bsd_dr_set (7, control); +} + +void +amd64bsd_dr_set_addr (int regnum, CORE_ADDR addr) +{ + gdb_assert (regnum >= 0 && regnum <= 4); + + amd64bsd_dr_set (regnum, addr); +} + +void +amd64bsd_dr_reset_addr (int regnum) +{ + gdb_assert (regnum >= 0 && regnum <= 4); + + amd64bsd_dr_set (regnum, 0); +} + +unsigned long +amd64bsd_dr_get_status (void) +{ + struct dbreg dbregs; + + /* FIXME: kettenis/2001-03-31: Calling perror_with_name if the + ptrace call fails breaks debugging remote targets. The correct + way to fix this is to add the hardware breakpoint and watchpoint + stuff to the target vector. For now, just return zero if the + ptrace call fails. */ + if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid), + (PTRACE_TYPE_ARG3) &dbregs, 0) == -1) +#if 0 + perror_with_name (_("Couldn't read debug registers")); +#else + return 0; +#endif + + return DBREG_DRX ((&dbregs), 6); +} + +#endif /* PT_GETDBREGS */ diff --git a/gdb/amd64bsd-nat.h b/gdb/amd64bsd-nat.h new file mode 100644 index 0000000..0048f54 --- /dev/null +++ b/gdb/amd64bsd-nat.h @@ -0,0 +1,35 @@ +/* Native-dependent code for modern AMD64 BSD's. + + Copyright (C) 2011 + Free Software Foundation, Inc. + Contributed by Valery Khromov, Yandex. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#ifndef AMD64BSD_NAT_H +#define AMD64BSD_NAT_H + +/* low level amd64 debug register functions used in amd64fbsd-nat.c. */ + +extern void amd64bsd_dr_set_control (unsigned long control); + +extern void amd64bsd_dr_set_addr (int regnum, CORE_ADDR addr); + +extern void amd64bsd_dr_reset_addr (int regnum); + +extern unsigned long amd64bsd_dr_get_status (void); + +#endif /* amd64bsd-nat.h */ diff --git a/gdb/amd64fbsd-nat.c b/gdb/amd64fbsd-nat.c index 1663abc..8ffd42b 100644 --- a/gdb/amd64fbsd-nat.c +++ b/gdb/amd64fbsd-nat.c @@ -35,6 +35,8 @@ #include "fbsd-nat.h" #include "amd64-tdep.h" #include "amd64-nat.h" +#include "amd64bsd-nat.h" +#include "i386-nat.h" /* Offset in `struct reg' where MEMBER is stored. */ @@ -197,6 +199,19 @@ _initialize_amd64fbsd_nat (void) /* Add some extra features to the common *BSD/i386 target. */ t = amd64bsd_target (); + +#ifdef HAVE_PT_GETDBREGS + + i386_use_watchpoints (t); + + i386_dr_low.set_control = amd64bsd_dr_set_control; + i386_dr_low.set_addr = amd64bsd_dr_set_addr; + i386_dr_low.reset_addr = amd64bsd_dr_reset_addr; + i386_dr_low.get_status = amd64bsd_dr_get_status; + i386_set_debug_register_length (8); + +#endif /* HAVE_PT_GETDBREGS */ + t->to_pid_to_exec_file = fbsd_pid_to_exec_file; t->to_find_memory_regions = fbsd_find_memory_regions; t->to_make_corefile_notes = fbsd_make_corefile_notes; diff --git a/gdb/config/i386/fbsd64.mh b/gdb/config/i386/fbsd64.mh index 2266def..24a87bf 100644 --- a/gdb/config/i386/fbsd64.mh +++ b/gdb/config/i386/fbsd64.mh @@ -1,6 +1,6 @@ # Host: FreeBSD/amd64 NATDEPFILES= fork-child.o inf-ptrace.o \ - fbsd-nat.o amd64-nat.o amd64bsd-nat.o amd64fbsd-nat.o \ + fbsd-nat.o i386-nat.o amd64-nat.o amd64bsd-nat.o amd64fbsd-nat.o \ bsd-kvm.o LOADLIBES= -lkvm -- WBR, Valery Khromov