From patchwork Thu Jun 16 06:01:59 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Baldwin X-Patchwork-Id: 13124 Received: (qmail 123943 invoked by alias); 16 Jun 2016 06:02:22 -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 123793 invoked by uid 89); 16 Jun 2016 06:02:22 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-0.3 required=5.0 tests=AWL, BAYES_00, SPF_HELO_PASS, SPF_SOFTFAIL autolearn=no version=3.3.2 spammy=xfree X-Spam-User: qpsmtpd, 2 recipients X-HELO: bigwig.baldwin.cx Received: from bigwig.baldwin.cx (HELO bigwig.baldwin.cx) (96.47.65.170) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (CAMELLIA256-SHA encrypted) ESMTPS; Thu, 16 Jun 2016 06:02:20 +0000 Received: from ralph.baldwin.cx.net (c-73-231-226-104.hsd1.ca.comcast.net [73.231.226.104]) by bigwig.baldwin.cx (Postfix) with ESMTPSA id 2F386B98D; Thu, 16 Jun 2016 02:02:18 -0400 (EDT) From: John Baldwin To: gdb-patches@sourceware.org, binutils@sourceware.org Subject: [PATCH 3/6] Fetch the ELF auxiliary vector from live processes on FreeBSD. Date: Wed, 15 Jun 2016 23:01:59 -0700 Message-Id: <20160616060202.63470-4-jhb@FreeBSD.org> In-Reply-To: <20160616060202.63470-1-jhb@FreeBSD.org> References: <20160616060202.63470-1-jhb@FreeBSD.org> X-IsSubscribed: yes Use the kern.proc.auxv. sysctl to fetch the ELF auxiliary vector for a live process. gdb/ChangeLog: * fbsd-nat.c [KERN_PROC_AUXV] New variable super_xfer_partial. (fbsd_xfer_partial): New function. (fbsd_nat_add_target) [KERN_PROC_AUXV] Set "to_xfer_partial" to "fbsd_xfer_partial". --- gdb/ChangeLog | 7 ++++++ gdb/fbsd-nat.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 81 insertions(+) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 9e57431..b11174c 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,10 @@ +2016-06-15 John Baldwin + + * fbsd-nat.c [KERN_PROC_AUXV] New variable super_xfer_partial. + (fbsd_xfer_partial): New function. + (fbsd_nat_add_target) [KERN_PROC_AUXV] Set "to_xfer_partial" to + "fbsd_xfer_partial". + 2016-06-14 John Baldwin * v850-tdep.c (v850_use_struct_convention): Trim type length checks. diff --git a/gdb/fbsd-nat.c b/gdb/fbsd-nat.c index b582abe..f9cfee6 100644 --- a/gdb/fbsd-nat.c +++ b/gdb/fbsd-nat.c @@ -206,6 +206,76 @@ fbsd_find_memory_regions (struct target_ops *self, } #endif +#ifdef KERN_PROC_AUXV +static enum target_xfer_status (*super_xfer_partial) (struct target_ops *ops, + enum target_object object, + const char *annex, + gdb_byte *readbuf, + const gdb_byte *writebuf, + ULONGEST offset, + ULONGEST len, + ULONGEST *xfered_len); + +static enum target_xfer_status +fbsd_xfer_partial (struct target_ops *ops, enum target_object object, + const char *annex, gdb_byte *readbuf, + const gdb_byte *writebuf, + ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) +{ + pid_t pid = ptid_get_pid (inferior_ptid); + + switch (object) + { + case TARGET_OBJECT_AUXV: + { + struct cleanup *cleanup = make_cleanup (null_cleanup, NULL); + unsigned char *buf; + size_t buflen; + int mib[4]; + + if (writebuf) + return TARGET_XFER_E_IO; + mib[0] = CTL_KERN; + mib[1] = KERN_PROC; + mib[2] = KERN_PROC_AUXV; + mib[3] = pid; + if (offset == 0) + { + buf = readbuf; + buflen = len; + } + else + { + buflen = offset + len; + buf = XCNEWVEC (unsigned char, buflen); + cleanup = make_cleanup (xfree, buf); + } + if (sysctl (mib, 4, buf, &buflen, NULL, 0) == 0) + { + if (offset != 0) + { + if (buflen > offset) + { + buflen -= offset; + memcpy (readbuf, buf + offset, buflen); + } + else + buflen = 0; + } + do_cleanups (cleanup); + *xfered_len = buflen; + return (buflen == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; + } + do_cleanups (cleanup); + return TARGET_XFER_E_IO; + } + default: + return super_xfer_partial (ops, object, annex, readbuf, writebuf, offset, + len, xfered_len); + } +} +#endif + #ifdef PT_LWPINFO static int debug_fbsd_lwp; @@ -824,6 +894,10 @@ fbsd_nat_add_target (struct target_ops *t) { t->to_pid_to_exec_file = fbsd_pid_to_exec_file; t->to_find_memory_regions = fbsd_find_memory_regions; +#ifdef KERN_PROC_AUXV + super_xfer_partial = t->to_xfer_partial; + t->to_xfer_partial = fbsd_xfer_partial; +#endif #ifdef PT_LWPINFO t->to_thread_alive = fbsd_thread_alive; t->to_pid_to_str = fbsd_pid_to_str;