From patchwork Sat Feb 9 00:40:12 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Baldwin X-Patchwork-Id: 31380 Received: (qmail 28384 invoked by alias); 9 Feb 2019 00:42:44 -0000 Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org Delivered-To: mailing list gdb-patches@sourceware.org Received: (qmail 28172 invoked by uid 89); 9 Feb 2019 00:42:43 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-26.2 required=5.0 tests=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=HContent-Transfer-Encoding:8bit 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; Sat, 09 Feb 2019 00:42:42 +0000 Received: from ralph.com (ralph.baldwin.cx [66.234.199.215]) by mail.baldwin.cx (Postfix) with ESMTPSA id 119E410B768 for ; Fri, 8 Feb 2019 19:42:39 -0500 (EST) From: John Baldwin To: gdb-patches@sourceware.org Subject: [PATCH v2 09/11] Support TLS variables on FreeBSD/i386. Date: Fri, 8 Feb 2019 16:40:12 -0800 Message-Id: In-Reply-To: References: MIME-Version: 1.0 X-IsSubscribed: yes Derive the pointer to the DTV array from the gs_base register. As with FreeBSD/amd64, gs_base is currently only available via the native target. gdb/ChangeLog: * i386-fbsd-tdep.c (i386fbsd_get_thread_local_address): New. (i386fbsd_init_abi): Install gdbarch "fetch_tls_load_module_address" and "get_thread_local_address" methods. --- gdb/ChangeLog | 7 +++++++ gdb/i386-fbsd-tdep.c | 29 +++++++++++++++++++++++++++++ 2 files changed, 36 insertions(+) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 2ed15dc048..7af211fd2d 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,10 @@ +2019-02-08 John Baldwin + + * i386-fbsd-tdep.c (i386fbsd_get_thread_local_address): New. + (i386fbsd_init_abi): Install gdbarch + "fetch_tls_load_module_address" and "get_thread_local_address" + methods. + 2019-02-08 John Baldwin * amd64-fbsd-tdep.c (amd64fbsd_get_thread_local_address): New. diff --git a/gdb/i386-fbsd-tdep.c b/gdb/i386-fbsd-tdep.c index ac57e7383d..f274847174 100644 --- a/gdb/i386-fbsd-tdep.c +++ b/gdb/i386-fbsd-tdep.c @@ -320,6 +320,30 @@ i386fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch, "XSAVE extended state", cb_data); } +/* Implement the get_thread_local_address gdbarch method. */ + +static CORE_ADDR +i386fbsd_get_thread_local_address (struct gdbarch *gdbarch, ptid_t ptid, + CORE_ADDR lm_addr, CORE_ADDR offset) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + struct regcache *regcache; + + if (tdep->fsbase_regnum == -1) + error (_("Unable to fetch %%gsbase")); + + regcache = get_thread_arch_regcache (ptid, gdbarch); + + target_fetch_registers (regcache, tdep->fsbase_regnum + 1); + + ULONGEST gsbase; + if (regcache->cooked_read (tdep->fsbase_regnum + 1, &gsbase) != REG_VALID) + error (_("Unable to fetch %%gsbase")); + + CORE_ADDR dtv_addr = gsbase + gdbarch_ptr_bit (gdbarch) / 8; + return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset); +} + static void i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) { @@ -418,6 +442,11 @@ i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) set_gdbarch_core_read_description (gdbarch, i386fbsd_core_read_description); + + set_gdbarch_fetch_tls_load_module_address (gdbarch, + svr4_fetch_objfile_link_map); + set_gdbarch_get_thread_local_address (gdbarch, + i386fbsd_get_thread_local_address); } void