From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 2140) id 3EBBD3858438; Fri, 9 Jun 2023 06:25:51 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3EBBD3858438 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1686291951; bh=BJMLdCxgIEOyzDCl6A4vc1coeOuhTrLFdXJ17qkcKSI=; h=From:To:Subject:Date:From; b=xv9sEgjA7TkhthCb5mdmHAHSavcC1xr3iTZQTRgFzk6visTIBm1qVqI5jFS35JBFB YNojzJbhLQD2q/4Y+LRC0PJ/GCXxgsUYQdKFx2UgqKutEWJI0lgGzgi3actVXcK2nt g+LAqbvLxWAlnPDsGZsf3DIivAhYzSO7HuKMdIu8= Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Alexandre Oliva To: gcc-cvs@gcc.gnu.org Subject: [gcc(refs/users/aoliva/heads/testme)] Add leafy mode for zero-call-used-regs [ada doc] X-Act-Checkin: gcc X-Git-Author: Alexandre Oliva X-Git-Refname: refs/users/aoliva/heads/testme X-Git-Oldrev: 8107c786ebc29b9f6b8b41b22f0b9acc1cc19faa X-Git-Newrev: da37feda0970176380a493d58ae39cf6a8f1f9d4 Message-Id: <20230609062551.3EBBD3858438@sourceware.org> Date: Fri, 9 Jun 2023 06:25:51 +0000 (GMT) List-Id: https://gcc.gnu.org/g:da37feda0970176380a493d58ae39cf6a8f1f9d4 commit da37feda0970176380a493d58ae39cf6a8f1f9d4 Author: Alexandre Oliva Date: Thu Jun 8 01:35:34 2023 -0300 Add leafy mode for zero-call-used-regs [ada doc] Document leafy mode. for gcc/ada/ChangeLog * doc/gnat_rm/security_hardening_features.rst (Register Scrubbing): Document leafy mode. Diff: --- gcc/ada/doc/gnat_rm/security_hardening_features.rst | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/gcc/ada/doc/gnat_rm/security_hardening_features.rst b/gcc/ada/doc/gnat_rm/security_hardening_features.rst index 4ea38b14df1..29c897b21dd 100644 --- a/gcc/ada/doc/gnat_rm/security_hardening_features.rst +++ b/gcc/ada/doc/gnat_rm/security_hardening_features.rst @@ -34,6 +34,12 @@ subprograms. pragma Machine_Attribute (Bar, "zero_call_used_regs", "all"); -- Before returning, Bar scrubs all call-clobbered registers. + function Baz return Integer; + pragma Machine_Attribute (Bar, "zero_call_used_regs", "leafy"); + -- Before returning, Bar scrubs only call-clobbered registers + -- that it uses itself, if it can be identified as a leaf + -- function, or all such registers otherwise. + For usage and more details on the command-line option, on the ``zero_call_used_regs`` attribute, and on their use with other