From 97b0656d67d2d39a79556bd200d3b6c41b2e5d6f Mon Sep 17 00:00:00 2001 From: Andre Vieira Date: Fri, 2 Dec 2016 15:24:40 +0000 Subject: [PATCH] Handling ARMv8-M Security Extension's cmse_nonsecure_entry attribute gcc/ChangeLog: 2016-12-02 Andre Vieira Thomas Preud'homme * 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. * config/arm/arm.h (ARM_FT_CMSE_ENTRY): New macro define. (IS_CMSE_ENTRY): Likewise. * doc/extend.texi (ARM ARMv8-M Security Extensions): New attribute. gcc/testsuite/ChangeLog: 2016-12-02 Andre Vieira Thomas Preud'homme * gcc.target/arm/cmse/cmse-3.c: New. Co-Authored-By: Thomas Preud'homme From-SVN: r243188 --- gcc/ChangeLog | 12 +++ gcc/config/arm/arm.c | 114 +++++++++++++++++++++ gcc/config/arm/arm.h | 2 + gcc/doc/extend.texi | 3 + gcc/testsuite/ChangeLog | 5 + gcc/testsuite/gcc.target/arm/cmse/cmse-3.c | 37 +++++++ 6 files changed, 173 insertions(+) create mode 100644 gcc/testsuite/gcc.target/arm/cmse/cmse-3.c diff --git a/gcc/ChangeLog b/gcc/ChangeLog index f24e99eaea7..7eb56d25e94 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,15 @@ +2016-12-02 Andre Vieira + Thomas Preud'homme + + * 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. + * config/arm/arm.h (ARM_FT_CMSE_ENTRY): New macro define. + (IS_CMSE_ENTRY): Likewise. + * doc/extend.texi (ARM ARMv8-M Security Extensions): New attribute. + 2016-12-02 Andre Vieira Thomas Preud'homme diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c index 0d7d38a73f1..7761564e8a2 100644 --- a/gcc/config/arm/arm.c +++ b/gcc/config/arm/arm.c @@ -136,6 +136,7 @@ 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); @@ -344,6 +345,9 @@ 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 } }; @@ -3633,6 +3637,9 @@ 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; } @@ -6634,6 +6641,113 @@ arm_handle_notshared_attribute (tree *node, } #endif +/* This function returns true if a function with declaration FNDECL and type + FNTYPE uses the stack to pass arguments or return variables and false + otherwise. This is used for functions with the attributes + 'cmse_nonsecure_call' or 'cmse_nonsecure_entry' and this function will issue + diagnostic messages if the stack is used. NAME is the name of the attribute + used. */ + +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; + warning (OPT_Wattributes, "%qE attribute ignored without -mcmse option.", + name); + 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/config/arm/arm.h b/gcc/config/arm/arm.h index 3d627436c57..928fad4a826 100644 --- a/gcc/config/arm/arm.h +++ b/gcc/config/arm/arm.h @@ -1385,6 +1385,7 @@ 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) @@ -1393,6 +1394,7 @@ 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/doc/extend.texi b/gcc/doc/extend.texi index 6c7fff2701a..d72af3efaf2 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -12648,6 +12648,9 @@ Security Extensions: Requiremenets on Development Tools Engineering Specification, which can be found at @uref{http://infocenter.arm.com/help/topic/com.arm.doc.ecm0359818/ECM0359818_armv8m_security_extensions_reqs_on_dev_tools_1_0.pdf}. +As part of the Security Extensions GCC implements a new function attribute +@code{cmse_nonsecure_entry}. + As part of the Security Extensions GCC implements the intrinsics below. FPTR is used here to mean any function pointer type. diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 1e3d651d51d..4e1240e22be 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2016-12-02 Andre Vieira + Thomas Preud'homme + + * gcc.target/arm/cmse/cmse-3.c: New. + 2016-12-02 Andre Vieira Thomas Preud'homme 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 00000000000..2c2920e1dc3 --- /dev/null +++ b/gcc/testsuite/gcc.target/arm/cmse/cmse-3.c @@ -0,0 +1,37 @@ +/* { dg-do compile } */ +/* { 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" } */ -- 2.30.2