mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-23 04:52:54 +02:00
dc9a43dec1
This implements execute-only support for ARM code generation, which prevents the compiler from generating data accesses to code sections. The following changes are involved: * Add the CodeGen option "-arm-execute-only" to the ARM code generator. * Add the clang flag "-mexecute-only" as well as the GCC-compatible alias "-mpure-code" to enable this option. * When enabled, literal pools are replaced with MOVW/MOVT instructions, with VMOV used in addition for floating-point literals. As the MOVT instruction is required, execute-only support is only available in Thumb mode for targets supporting ARMv8-M baseline or Thumb2. * Jump tables are placed in data sections when in execute-only mode. * The execute-only text section is assigned section ID 0, and is marked as unreadable with the SHF_ARM_PURECODE flag with symbol 'y'. This also overrides selection of ELF sections for globals. llvm-svn: 289784
24 lines
760 B
LLVM
24 lines
760 B
LLVM
; RUN: llc < %s -mtriple=thumbv7m -arm-execute-only %s -o - | FileCheck %s
|
|
; RUN: llc < %s -mtriple=thumbv8m.base -arm-execute-only %s -o - | FileCheck %s
|
|
; RUN: llc < %s -mtriple=thumbv8m.main -arm-execute-only %s -o - | FileCheck %s
|
|
|
|
; CHECK: .section .text,"axy",%progbits,unique,0
|
|
; CHECK-NOT: .section
|
|
; CHECK-NOT: .text
|
|
; CHECK: .globl test_SectionForGlobal
|
|
; CHECK: .type test_SectionForGlobal,%function
|
|
define void @test_SectionForGlobal() {
|
|
entry:
|
|
ret void
|
|
}
|
|
|
|
; CHECK: .section .test,"axy",%progbits
|
|
; CHECK-NOT: .section
|
|
; CHECK-NOT: .text
|
|
; CHECK: .globl test_ExplicitSectionForGlobal
|
|
; CHECK: .type test_ExplicitSectionForGlobal,%function
|
|
define void @test_ExplicitSectionForGlobal() section ".test" {
|
|
entry:
|
|
ret void
|
|
}
|