Index: include/clang/Basic/DiagnosticCommonKinds.td =================================================================== --- include/clang/Basic/DiagnosticCommonKinds.td +++ include/clang/Basic/DiagnosticCommonKinds.td @@ -190,6 +190,8 @@ "the '%0' unit is not supported with this instruction set">; def err_target_unsupported_unaligned : Error< "the %0 sub-architecture does not support unaligned accesses">; +def err_target_unsupported_execute_only : Error< + "execute only is not supported for the %0 sub-architecture">; def err_opt_not_valid_with_opt : Error< "option '%0' cannot be specified with '%1'">; Index: include/clang/Driver/Options.td =================================================================== --- include/clang/Driver/Options.td +++ include/clang/Driver/Options.td @@ -1455,6 +1455,12 @@ HelpText<"Generate branches with extended addressability, usually via indirect jumps.">; def mno_long_calls : Flag<["-"], "mno-long-calls">, Group, HelpText<"Restore the default behaviour of not generating long calls">; +def mexecute_only : Flag<["-"], "mexecute-only">, Group, + HelpText<"Disallow generation of data access to code sections (ARM only)">; +def mno_execute_only : Flag<["-"], "mno-execute-only">, Group, + HelpText<"Allow generation of data access to code sections (ARM only)">; +def mpure_code : Flag<["-"], "mpure-code">, Alias; // Alias for GCC compatibility +def mno_pure_code : Flag<["-"], "mno-pure-code">, Alias; def mtvos_version_min_EQ : Joined<["-"], "mtvos-version-min=">, Group; def mappletvos_version_min_EQ : Joined<["-"], "mappletvos-version-min=">, Alias; def mtvos_simulator_version_min_EQ : Joined<["-"], "mtvos-simulator-version-min=">, Alias; Index: lib/Driver/Tools.cpp =================================================================== --- lib/Driver/Tools.cpp +++ lib/Driver/Tools.cpp @@ -1139,6 +1139,27 @@ Features.push_back("+long-calls"); } + // Generate execute-only output (no data access to code sections). + // Supported only on ARMv6T2 and ARMv7 and above. + // Cannot be combined with -mno-movt or -mlong-calls + if (Arg *A = Args.getLastArg(options::OPT_mexecute_only, options::OPT_mno_execute_only)) { + if (A->getOption().matches(options::OPT_mexecute_only)) { + if (getARMSubArchVersionNumber(Triple) < 7 && + llvm::ARM::parseArch(Triple.getArchName()) != llvm::ARM::AK_ARMV6T2) + D.Diag(diag::err_target_unsupported_execute_only) << Triple.getArchName(); + else if (Arg *B = Args.getLastArg(options::OPT_mno_movt)) + D.Diag(diag::err_opt_not_valid_with_opt) << A->getAsString(Args) << B->getAsString(Args); + else if (Arg *B = Args.getLastArg(options::OPT_mlong_calls, options::OPT_mno_long_calls)) { + if (B->getOption().matches(options::OPT_mlong_calls)) + D.Diag(diag::err_opt_not_valid_with_opt) << A->getAsString(Args) << B->getAsString(Args); + } + else + Features.push_back("+execute-only"); + } else { + Features.push_back("-execute-only"); + } + } + // Kernel code has more strict alignment requirements. if (KernelOrKext) Features.push_back("+strict-align"); Index: test/Driver/arm-execute-only.c =================================================================== --- /dev/null +++ test/Driver/arm-execute-only.c @@ -0,0 +1,99 @@ +// RUN: %clang -target armv6t2-eabi -### %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-NO-EXECUTE-ONLY + +// RUN: %clang -target armv6t2-eabi -### -mexecute-only %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-EXECUTE-ONLY + +// RUN: %clang -target armv6t2-eabi -### -mexecute-only -mno-execute-only %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-NO-EXECUTE-ONLY + +// RUN: %clang -target armv7m-eabi -### %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-NO-EXECUTE-ONLY + +// RUN: %clang -target armv7m-eabi -### -mexecute-only %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-EXECUTE-ONLY + +// RUN: %clang -target armv7m-eabi -### -mexecute-only -mno-execute-only %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-NO-EXECUTE-ONLY + +// RUN: %clang -target armv8m.base-eabi -### %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-NO-EXECUTE-ONLY + +// RUN: %clang -target armv8m.base-eabi -### -mexecute-only %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-EXECUTE-ONLY + +// RUN: %clang -target armv8m.base-eabi -### -mexecute-only -mno-execute-only %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-NO-EXECUTE-ONLY + +// RUN: %clang -target armv8m.main-eabi -### %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-NO-EXECUTE-ONLY + +// RUN: %clang -target armv8m.main-eabi -### -mexecute-only %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-EXECUTE-ONLY + +// RUN: %clang -target armv8m.main-eabi -### -mexecute-only -mno-execute-only %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-NO-EXECUTE-ONLY + +// RUN: not %clang -c -target thumbv6m-eabi -mexecute-only %s 2>&1 | \ +// RUN: FileCheck --check-prefix CHECK-EXECUTE-ONLY-NOT-SUPPORTED %s + +// RUN: %clang -target armv8m.main-eabi -mexecute-only -mno-movt %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-EXECUTE-ONLY-NO-MOVT + +// RUN: %clang -target armv8m.main-eabi -mexecute-only -mlong-calls %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-EXECUTE-ONLY-LONG-CALLS + + +// -mpure-code flag for GCC compatibility +// RUN: %clang -target armv6t2-eabi -### %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-NO-EXECUTE-ONLY + +// RUN: %clang -target armv6t2-eabi -### -mpure-code %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-EXECUTE-ONLY + +// RUN: %clang -target armv6t2-eabi -### -mpure-code -mno-pure-code %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-NO-EXECUTE-ONLY + +// RUN: %clang -target armv7m-eabi -### %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-NO-EXECUTE-ONLY + +// RUN: %clang -target armv7m-eabi -### -mpure-code %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-EXECUTE-ONLY + +// RUN: %clang -target armv7m-eabi -### -mpure-code -mno-pure-code %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-NO-EXECUTE-ONLY + +// RUN: %clang -target armv8m.base-eabi -### %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-NO-EXECUTE-ONLY + +// RUN: %clang -target armv8m.base-eabi -### -mpure-code %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-EXECUTE-ONLY + +// RUN: %clang -target armv8m.base-eabi -### -mpure-code -mno-pure-code %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-NO-EXECUTE-ONLY + +// RUN: %clang -target armv8m.main-eabi -### %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-NO-EXECUTE-ONLY + +// RUN: %clang -target armv8m.main-eabi -### -mpure-code %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-EXECUTE-ONLY + +// RUN: %clang -target armv8m.main-eabi -### -mpure-code -mno-pure-code %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-NO-EXECUTE-ONLY + +// RUN: not %clang -c -target thumbv6m-eabi -mpure-code %s 2>&1 | \ +// RUN: FileCheck --check-prefix CHECK-EXECUTE-ONLY-NOT-SUPPORTED %s + +// RUN: %clang -target armv8m.main-eabi -mpure-code -mno-movt %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-EXECUTE-ONLY-NO-MOVT + +// RUN: %clang -target armv8m.main-eabi -mpure-code -mlong-calls %s 2>&1 \ +// RUN: | FileCheck %s -check-prefix CHECK-EXECUTE-ONLY-LONG-CALLS + +// +// CHECK-NO-EXECUTE-ONLY-NOT: "-target-feature" "+execute-only" +// CHECK-EXECUTE-ONLY: "-target-feature" "+execute-only" + +// CHECK-EXECUTE-ONLY-NOT-SUPPORTED: error: execute only is not supported for the thumbv6m sub-architecture +// CHECK-EXECUTE-ONLY-NO-MOVT: error: option '-mexecute-only' cannot be specified with '-mno-movt' +// CHECK-EXECUTE-ONLY-LONG-CALLS: error: option '-mexecute-only' cannot be specified with '-mlong-calls'