From patchwork Sat Dec 26 01:47:31 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Thomas Preudhomme X-Patchwork-Id: 561080 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from sourceware.org (server1.sourceware.org [209.132.180.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 273BB140C8F for ; Sat, 26 Dec 2015 12:47:51 +1100 (AEDT) Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=gcc.gnu.org header.i=@gcc.gnu.org header.b=XylTSsz+; dkim-atps=neutral DomainKey-Signature: a=rsa-sha1; c=nofws; d=gcc.gnu.org; h=list-id :list-unsubscribe:list-archive:list-post:list-help:sender:from :to:subject:date:message-id:mime-version:content-type :content-transfer-encoding; q=dns; s=default; b=thl3irW0i/5KNDT/ skLurB+L6pFiYzq/eXPZflgBnV2a4vQs+JVP3vjcZ7+xNmPvHdD8tuh3n0UOuqjM ztCuax2TwNmuR9mpm6EvJUCp1gy0wLO0yIYkZYHyHOkB6+QLCBPaFH1NibOLv/XZ EWX8VYX5YT+24EbXEQgs8XEuQxY= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=gcc.gnu.org; h=list-id :list-unsubscribe:list-archive:list-post:list-help:sender:from :to:subject:date:message-id:mime-version:content-type :content-transfer-encoding; s=default; bh=4gn8uwrmpfaMd3kCD+Vscb ULaic=; b=XylTSsz+gpfVnhlLmQdbE0ZKh9OwUwpxqvWEZE7znHrFFxyouMpfrm 34PyM/JHFhjpjbJkXPSK81xZJxie5Nc1A/JUcklK3GedMH/y6U0mZWM03zuVQJ1A /t0rVKE6q83ZEyeNqjsq4a/3RZHPEtVicmkW/sQuJr+LXpofN88Bs= Received: (qmail 2977 invoked by alias); 26 Dec 2015 01:47:38 -0000 Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org Delivered-To: mailing list gcc-patches@gcc.gnu.org Received: (qmail 2967 invoked by uid 89); 26 Dec 2015 01:47:38 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: =?ISO-8859-1?Q?No, score=2.3 required=5.0 tests=AWL, BAYES_50, KAM_LAZY_DOMAIN_SECURITY, KAM_LOTSOFHASH, RP_MATCHES_RCVD autolearn=no version=3.3.2 spammy=UD:doc.ecm0359818, comarmdocecm0359818, ARM=c2=aev8-M, 2015-10-27?= X-HELO: foss.arm.com Received: from foss.arm.com (HELO foss.arm.com) (217.140.101.70) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Sat, 26 Dec 2015 01:47:36 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id E477E49 for ; Fri, 25 Dec 2015 17:47:06 -0800 (PST) Received: from SHAWIN202 (unknown [10.164.6.62]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 4AF213F21A for ; Fri, 25 Dec 2015 17:47:33 -0800 (PST) From: "Thomas Preud'homme" To: Subject: [RFC][PATCH, ARM 3/8] Handling ARMv8-M Security Extension's cmse_nonsecure_entry attribute Date: Sat, 26 Dec 2015 09:47:31 +0800 Message-ID: <001001d13f7f$6479b7b0$2d6d2710$@foss.arm.com> MIME-Version: 1.0 [Sending on behalf of Andre Vieira] Hello, This patch adds support for the ARMv8-M Security Extensions 'cmse_nonsecure_entry' attribute. In this patch we implement the attribute handling and diagnosis around the attribute. See Section 5.4 of ARM®v8-M Security Extensions (http://infocenter.arm.com/help/topic/com.arm.doc.ecm0359818/index.html). *** gcc/ChangeLog *** 2015-10-27 Andre Vieira Thomas Preud'homme * gcc/config/arm/arm.c (arm_handle_cmse_nonsecure_entry): New. (arm_attribute_table): Added cmse_nonsecure_entry (arm_compute_func_type): Handle cmse_nonsecure_entry. (cmse_func_args_or_return_in_stack): New. (arm_handle_cmse_nonsecure_entry): New. * gcc/config/arm/arm.h (ARM_FT_CMSE_ENTRY): New macro define. (IS_CMSE_ENTRY): Likewise. *** gcc/testsuite/ChangeLog *** 2015-10-27 Andre Vieira Thomas Preud'homme * gcc.target/arm/cmse/cmse-3.c: New. We welcome any comment. Cheers, Andre diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h index cf6d9466fb79e4f8a2dbfe725c52d5be8ea24fd2..f12e3c93bbe24b10ed8eee6687161826773ef649 100644 --- a/gcc/config/arm/arm.h +++ b/gcc/config/arm/arm.h @@ -1375,6 +1375,7 @@ enum reg_class #define ARM_FT_VOLATILE (1 << 4) /* Does not return. */ #define ARM_FT_NESTED (1 << 5) /* Embedded inside another func. */ #define ARM_FT_STACKALIGN (1 << 6) /* Called with misaligned stack. */ +#define ARM_FT_CMSE_ENTRY (1 << 7) /* ARMv8-M non-secure entry function. */ /* Some macros to test these flags. */ #define ARM_FUNC_TYPE(t) (t & ARM_FT_TYPE_MASK) @@ -1383,6 +1384,7 @@ enum reg_class #define IS_NAKED(t) (t & ARM_FT_NAKED) #define IS_NESTED(t) (t & ARM_FT_NESTED) #define IS_STACKALIGN(t) (t & ARM_FT_STACKALIGN) +#define IS_CMSE_ENTRY(t) (t & ARM_FT_CMSE_ENTRY) /* Structure used to hold the function stack frame layout. Offsets are diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c index 2223101fbf96bceb4beb3a7d6cb04162481dc3bf..5b9e51b10e91eee64e3383c1ed50269c3e6cf24c 100644 --- a/gcc/config/arm/arm.c +++ b/gcc/config/arm/arm.c @@ -135,6 +135,7 @@ static tree arm_handle_isr_attribute (tree *, tree, tree, int, bool *); #if TARGET_DLLIMPORT_DECL_ATTRIBUTES static tree arm_handle_notshared_attribute (tree *, tree, tree, int, bool *); #endif +static tree arm_handle_cmse_nonsecure_entry (tree *, tree, tree, int, bool *); static void arm_output_function_epilogue (FILE *, HOST_WIDE_INT); static void arm_output_function_prologue (FILE *, HOST_WIDE_INT); static int arm_comp_type_attributes (const_tree, const_tree); @@ -343,6 +344,9 @@ static const struct attribute_spec arm_attribute_table[] = { "notshared", 0, 0, false, true, false, arm_handle_notshared_attribute, false }, #endif + /* ARMv8-M Security Extensions support. */ + { "cmse_nonsecure_entry", 0, 0, true, false, false, + arm_handle_cmse_nonsecure_entry, false }, { NULL, 0, 0, false, false, false, NULL, false } }; @@ -3562,6 +3566,9 @@ arm_compute_func_type (void) else type |= arm_isr_value (TREE_VALUE (a)); + if (lookup_attribute ("cmse_nonsecure_entry", attr)) + type |= ARM_FT_CMSE_ENTRY; + return type; } @@ -6552,6 +6559,109 @@ arm_handle_notshared_attribute (tree *node, } #endif +/* This function is used to check whether functions with attributes + cmse_nonsecure_call or cmse_nonsecure_entry use the stack to pass arguments + or return variables. If the function does indeed use the stack this + function returns true and diagnoses this, otherwise it returns false. */ + +static bool +cmse_func_args_or_return_in_stack (tree fndecl, tree name, tree fntype) +{ + function_args_iterator args_iter; + CUMULATIVE_ARGS args_so_far_v; + cumulative_args_t args_so_far; + bool first_param = true; + tree arg_type, prev_arg_type = NULL_TREE, ret_type; + + /* Error out if any argument is passed on the stack. */ + arm_init_cumulative_args (&args_so_far_v, fntype, NULL_RTX, fndecl); + args_so_far = pack_cumulative_args (&args_so_far_v); + FOREACH_FUNCTION_ARGS (fntype, arg_type, args_iter) + { + rtx arg_rtx; + machine_mode arg_mode = TYPE_MODE (arg_type); + + prev_arg_type = arg_type; + if (VOID_TYPE_P (arg_type)) + continue; + + if (!first_param) + arm_function_arg_advance (args_so_far, arg_mode, arg_type, true); + arg_rtx = arm_function_arg (args_so_far, arg_mode, arg_type, true); + if (!arg_rtx + || arm_arg_partial_bytes (args_so_far, arg_mode, arg_type, true)) + { + error ("%qE attribute not available to functions with arguments " + "passed on the stack", name); + return true; + } + first_param = false; + } + + /* Error out for variadic functions since we cannot control how many + arguments will be passed and thus stack could be used. stdarg_p () is not + used for the checking to avoid browsing arguments twice. */ + if (prev_arg_type != NULL_TREE && !VOID_TYPE_P (prev_arg_type)) + { + error ("%qE attribute not available to functions with variable number " + "of arguments", name); + return true; + } + + /* Error out if return value is passed on the stack. */ + ret_type = TREE_TYPE (fntype); + if (arm_return_in_memory (ret_type, fntype)) + { + error ("%qE attribute not available to functions that return value on " + "the stack", name); + return true; + } + return false; +} + +/* Called upon detection of the use of the cmse_nonsecure_entry attribute, this + function will check whether the attribute is allowed here and will add the + attribute to the function declaration tree or otherwise issue a warning. */ + +static tree +arm_handle_cmse_nonsecure_entry (tree *node, tree name, + tree /* args */, + int /* flags */, + bool *no_add_attrs) +{ + tree fndecl; + + if (!use_cmse) + { + *no_add_attrs = true; + return NULL_TREE; + } + + /* Ignore attribute for function types. */ + if (TREE_CODE (*node) != FUNCTION_DECL) + { + warning (OPT_Wattributes, "%qE attribute only applies to functions", + name); + *no_add_attrs = true; + return NULL_TREE; + } + + fndecl = *node; + + /* Warn for static linkage functions. */ + if (!TREE_PUBLIC (fndecl)) + { + warning (OPT_Wattributes, "%qE attribute has no effect on functions " + "with static linkage", name); + *no_add_attrs = true; + return NULL_TREE; + } + + *no_add_attrs |= cmse_func_args_or_return_in_stack (fndecl, name, + TREE_TYPE (fndecl)); + return NULL_TREE; +} + /* Return 0 if the attributes for two types are incompatible, 1 if they are compatible, and 2 if they are nearly compatible (which causes a warning to be generated). */ diff --git a/gcc/testsuite/gcc.target/arm/cmse/cmse-3.c b/gcc/testsuite/gcc.target/arm/cmse/cmse-3.c new file mode 100644 index 0000000000000000000000000000000000000000..f806951e90256e8286d2d0f9467b51a73a522e2b --- /dev/null +++ b/gcc/testsuite/gcc.target/arm/cmse/cmse-3.c @@ -0,0 +1,38 @@ +/* { dg-do compile } */ +/* { dg-require-effective-target arm_cmse_ok } */ +/* { dg-options "-mcmse" } */ + +struct span { + int a, b; +}; +struct span2 { + float a, b, c, d; +}; + +union test_union +{ + long long a; + int b; + struct span2 c; +} test_union; + +void __attribute__ ((cmse_nonsecure_entry)) +foo (long long a, int b, long long c) {} /* { dg-error "not available to functions with arguments passed on the stack" } */ + +void __attribute__ ((cmse_nonsecure_entry)) +bar (long long a, int b, struct span c) {} /* { dg-error "not available to functions with arguments passed on the stack" } */ + +void __attribute__ ((cmse_nonsecure_entry)) +baz (int a, ...) {} /* { dg-error "not available to functions with variable number of arguments" } */ + +struct span __attribute__ ((cmse_nonsecure_entry)) +qux (void) { /* { dg-error "not available to functions that return value on the stack" } */ + struct span ret = {0, 0}; + return ret; +} + +void __attribute__ ((cmse_nonsecure_entry)) +norf (struct span2 a) {} + +void __attribute__ ((cmse_nonsecure_entry)) +foo2 (long long a, int b, union test_union c) {} /* { dg-error "not available to functions with arguments passed on the stack" } */