From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 67632 invoked by alias); 27 Jun 2017 22:51:00 -0000 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 Received: (qmail 67616 invoked by uid 89); 27 Jun 2017 22:50:59 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-24.0 required=5.0 tests=AWL,BAYES_00,GIT_PATCH_0,GIT_PATCH_1,GIT_PATCH_2,GIT_PATCH_3,SPF_HELO_PASS,SPF_SOFTFAIL autolearn=ham version=3.3.2 spammy= X-HELO: mail.baldwin.cx Received: from bigwig.baldwin.cx (HELO mail.baldwin.cx) (96.47.65.170) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Tue, 27 Jun 2017 22:50:58 +0000 Received: from ralph.baldwin.cx.com (c-73-231-226-104.hsd1.ca.comcast.net [73.231.226.104]) by mail.baldwin.cx (Postfix) with ESMTPSA id 5D4EA10AF08 for ; Tue, 27 Jun 2017 18:50:56 -0400 (EDT) From: John Baldwin To: gdb-patches@sourceware.org Subject: [PATCH 2/2] Support the fs_base and gs_base registers on FreeBSD/amd64 native processes. Date: Tue, 27 Jun 2017 22:51:00 -0000 Message-Id: <20170627224948.99138-3-jhb@FreeBSD.org> In-Reply-To: <20170627224948.99138-1-jhb@FreeBSD.org> References: <20170627224948.99138-1-jhb@FreeBSD.org> X-IsSubscribed: yes X-SW-Source: 2017-06/txt/msg00754.txt.bz2 Use ptrace operations to fetch and store the fs_base and gs_base registers for FreeBSD/amd64 processes. Note that FreeBSD does not currently store the value of these registers in core dumps, so these registers are only available when inspecting a running process. gdb/ChangeLog: * amd64-bsd-nat.c (amd64bsd_fetch_inferior_registers): Use PT_GETFSBASE and PT_GETGSBASE. (amd64bsd_store_inferior_registers): Use PT_SETFSBASE and PT_SETGSBASE. --- gdb/ChangeLog | 7 +++++++ gdb/amd64-bsd-nat.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 61 insertions(+) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 2196419fa3..09fe66a49a 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,5 +1,12 @@ 2017-06-26 John Baldwin + * amd64-bsd-nat.c (amd64bsd_fetch_inferior_registers): Use + PT_GETFSBASE and PT_GETGSBASE. + (amd64bsd_store_inferior_registers): Use PT_SETFSBASE and + PT_SETGSBASE. + +2017-06-26 John Baldwin + * features/Makefile (amd64.dat, amd64-avx.dat, amd64-mpx.dat) (amd64-avx-mpx.dat, amd64-avx-avx512.dat) (amd64-avx-mpx-avx512-pku.dat): Add i386/64bit-segments.xml in diff --git a/gdb/amd64-bsd-nat.c b/gdb/amd64-bsd-nat.c index ca61a3551b..41dee84269 100644 --- a/gdb/amd64-bsd-nat.c +++ b/gdb/amd64-bsd-nat.c @@ -57,6 +57,33 @@ amd64bsd_fetch_inferior_registers (struct target_ops *ops, return; } +#ifdef PT_GETFSBASE + if (regnum == -1 || regnum == AMD64_FSBASE_REGNUM) + { + register_t base; + + if (ptrace (PT_GETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1) + perror_with_name (_("Couldn't get segment register fs_base")); + + regcache_raw_supply (regcache, AMD64_FSBASE_REGNUM, &base); + if (regnum != -1) + return; + } +#endif +#ifdef PT_GETGSBASE + if (regnum == -1 || regnum == AMD64_GSBASE_REGNUM) + { + register_t base; + + if (ptrace (PT_GETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1) + perror_with_name (_("Couldn't get segment register gs_base")); + + regcache_raw_supply (regcache, AMD64_GSBASE_REGNUM, &base); + if (regnum != -1) + return; + } +#endif + if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum)) { struct fpreg fpregs; @@ -108,6 +135,33 @@ amd64bsd_store_inferior_registers (struct target_ops *ops, return; } +#ifdef PT_SETFSBASE + if (regnum == -1 || regnum == AMD64_FSBASE_REGNUM) + { + register_t base; + + regcache_raw_collect (regcache, AMD64_FSBASE_REGNUM, &base); + + if (ptrace (PT_SETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1) + perror_with_name (_("Couldn't write segment register fs_base")); + if (regnum != -1) + return; + } +#endif +#ifdef PT_SETGSBASE + if (regnum == -1 || regnum == AMD64_GSBASE_REGNUM) + { + register_t base; + + regcache_raw_collect (regcache, AMD64_GSBASE_REGNUM, &base); + + if (ptrace (PT_SETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1) + perror_with_name (_("Couldn't write segment register gs_base")); + if (regnum != -1) + return; + } +#endif + if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum)) { struct fpreg fpregs; -- 2.11.0