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b632d8aff2
On ELF targets, if a function has uwtable or personality, or does not have nounwind (`needsUnwindTableEntry`), it marks that `.eh_frame` is needed in the module. Then, a function gets `.eh_frame` if `needsUnwindTableEntry` or `-g[123]` is specified. (i.e. If -g[123], every function gets `.eh_frame`. This behavior is strange but that is the status quo on GCC and Clang.) Let's take asan as an example. Other sanitizers are similar. `asan.module_[cd]tor` has no attribute. `needsUnwindTableEntry` returns true, so every function gets `.eh_frame` if `-g[123]` is specified. This is the root cause that `-fno-exceptions -fno-asynchronous-unwind-tables -g` produces .debug_frame while `-fno-exceptions -fno-asynchronous-unwind-tables -g -fsanitize=address` produces .eh_frame. This patch * sets the nounwind attribute on sanitizer module ctor/dtor. * let Clang emit a module flag metadata "uwtable" for -fasynchronous-unwind-tables. If "uwtable" is set, sanitizer module ctor/dtor additionally get the uwtable attribute. The "uwtable" mechanism is generic: synthesized functions not cloned/specialized from existing ones should consider `Function::createWithDefaultAttr` instead of `Function::create` if they want to get some default attributes which have more of module semantics. Other candidates: "frame-pointer" (https://github.com/ClangBuiltLinux/linux/issues/955 https://github.com/ClangBuiltLinux/linux/issues/1238), dso_local, etc. Differential Revision: https://reviews.llvm.org/D100251
204 lines
5.5 KiB
LLVM
204 lines
5.5 KiB
LLVM
; Test basic address sanitizer instrumentation.
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;
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; RUN: opt < %s -hwasan -hwasan-instrument-with-calls -S | FileCheck %s --check-prefixes=CHECK,ABORT
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; RUN: opt < %s -hwasan -hwasan-instrument-with-calls -hwasan-recover=1 -S | FileCheck %s --check-prefixes=CHECK,RECOVER
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target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
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target triple = "aarch64--linux-android"
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define i8 @test_load8(i8* %a) sanitize_hwaddress {
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; CHECK-LABEL: @test_load8(
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; CHECK: %[[A:[^ ]*]] = ptrtoint i8* %a to i64
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; ABORT: call void @__hwasan_load1(i64 %[[A]])
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; RECOVER: call void @__hwasan_load1_noabort(i64 %[[A]])
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; CHECK: %[[B:[^ ]*]] = load i8, i8* %a
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; CHECK: ret i8 %[[B]]
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entry:
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%b = load i8, i8* %a, align 4
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ret i8 %b
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}
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define i16 @test_load16(i16* %a) sanitize_hwaddress {
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; CHECK-LABEL: @test_load16(
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; CHECK: %[[A:[^ ]*]] = ptrtoint i16* %a to i64
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; ABORT: call void @__hwasan_load2(i64 %[[A]])
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; RECOVER: call void @__hwasan_load2_noabort(i64 %[[A]])
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; CHECK: %[[B:[^ ]*]] = load i16, i16* %a
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; CHECK: ret i16 %[[B]]
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entry:
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%b = load i16, i16* %a, align 4
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ret i16 %b
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}
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define i32 @test_load32(i32* %a) sanitize_hwaddress {
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; CHECK-LABEL: @test_load32(
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; CHECK: %[[A:[^ ]*]] = ptrtoint i32* %a to i64
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; ABORT: call void @__hwasan_load4(i64 %[[A]])
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; RECOVER: call void @__hwasan_load4_noabort(i64 %[[A]])
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; CHECK: %[[B:[^ ]*]] = load i32, i32* %a
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; CHECK: ret i32 %[[B]]
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entry:
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%b = load i32, i32* %a, align 4
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ret i32 %b
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}
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define i64 @test_load64(i64* %a) sanitize_hwaddress {
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; CHECK-LABEL: @test_load64(
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; CHECK: %[[A:[^ ]*]] = ptrtoint i64* %a to i64
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; ABORT: call void @__hwasan_load8(i64 %[[A]])
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; RECOVER: call void @__hwasan_load8_noabort(i64 %[[A]])
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; CHECK: %[[B:[^ ]*]] = load i64, i64* %a
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; CHECK: ret i64 %[[B]]
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entry:
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%b = load i64, i64* %a, align 8
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ret i64 %b
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}
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define i128 @test_load128(i128* %a) sanitize_hwaddress {
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; CHECK-LABEL: @test_load128(
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; CHECK: %[[A:[^ ]*]] = ptrtoint i128* %a to i64
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; ABORT: call void @__hwasan_load16(i64 %[[A]])
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; RECOVER: call void @__hwasan_load16_noabort(i64 %[[A]])
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; CHECK: %[[B:[^ ]*]] = load i128, i128* %a
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; CHECK: ret i128 %[[B]]
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entry:
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%b = load i128, i128* %a, align 16
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ret i128 %b
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}
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define i40 @test_load40(i40* %a) sanitize_hwaddress {
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; CHECK-LABEL: @test_load40(
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; CHECK: %[[A:[^ ]*]] = ptrtoint i40* %a to i64
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; ABORT: call void @__hwasan_loadN(i64 %[[A]], i64 5)
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; RECOVER: call void @__hwasan_loadN_noabort(i64 %[[A]], i64 5)
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; CHECK: %[[B:[^ ]*]] = load i40, i40* %a
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; CHECK: ret i40 %[[B]]
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entry:
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%b = load i40, i40* %a, align 4
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ret i40 %b
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}
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define void @test_store8(i8* %a, i8 %b) sanitize_hwaddress {
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; CHECK-LABEL: @test_store8(
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; CHECK: %[[A:[^ ]*]] = ptrtoint i8* %a to i64
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; ABORT: call void @__hwasan_store1(i64 %[[A]])
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; RECOVER: call void @__hwasan_store1_noabort(i64 %[[A]])
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; CHECK: store i8 %b, i8* %a
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; CHECK: ret void
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entry:
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store i8 %b, i8* %a, align 4
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ret void
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}
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define void @test_store16(i16* %a, i16 %b) sanitize_hwaddress {
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; CHECK-LABEL: @test_store16(
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; CHECK: %[[A:[^ ]*]] = ptrtoint i16* %a to i64
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; ABORT: call void @__hwasan_store2(i64 %[[A]])
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; RECOVER: call void @__hwasan_store2_noabort(i64 %[[A]])
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; CHECK: store i16 %b, i16* %a
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; CHECK: ret void
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entry:
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store i16 %b, i16* %a, align 4
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ret void
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}
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define void @test_store32(i32* %a, i32 %b) sanitize_hwaddress {
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; CHECK-LABEL: @test_store32(
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; CHECK: %[[A:[^ ]*]] = ptrtoint i32* %a to i64
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; ABORT: call void @__hwasan_store4(i64 %[[A]])
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; RECOVER: call void @__hwasan_store4_noabort(i64 %[[A]])
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; CHECK: store i32 %b, i32* %a
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; CHECK: ret void
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entry:
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store i32 %b, i32* %a, align 4
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ret void
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}
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define void @test_store64(i64* %a, i64 %b) sanitize_hwaddress {
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; CHECK-LABEL: @test_store64(
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; CHECK: %[[A:[^ ]*]] = ptrtoint i64* %a to i64
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; ABORT: call void @__hwasan_store8(i64 %[[A]])
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; RECOVER: call void @__hwasan_store8_noabort(i64 %[[A]])
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; CHECK: store i64 %b, i64* %a
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; CHECK: ret void
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entry:
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store i64 %b, i64* %a, align 8
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ret void
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}
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define void @test_store128(i128* %a, i128 %b) sanitize_hwaddress {
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; CHECK-LABEL: @test_store128(
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; CHECK: %[[A:[^ ]*]] = ptrtoint i128* %a to i64
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; ABORT: call void @__hwasan_store16(i64 %[[A]])
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; RECOVER: call void @__hwasan_store16_noabort(i64 %[[A]])
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; CHECK: store i128 %b, i128* %a
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; CHECK: ret void
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entry:
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store i128 %b, i128* %a, align 16
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ret void
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}
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define void @test_store40(i40* %a, i40 %b) sanitize_hwaddress {
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; CHECK-LABEL: @test_store40(
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; CHECK: %[[A:[^ ]*]] = ptrtoint i40* %a to i64
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; ABORT: call void @__hwasan_storeN(i64 %[[A]], i64 5)
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; RECOVER: call void @__hwasan_storeN_noabort(i64 %[[A]], i64 5)
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; CHECK: store i40 %b, i40* %a
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; CHECK: ret void
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entry:
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store i40 %b, i40* %a, align 4
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ret void
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}
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define i8 @test_load_noattr(i8* %a) {
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; CHECK-LABEL: @test_load_noattr(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %[[B:[^ ]*]] = load i8, i8* %a
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; CHECK-NEXT: ret i8 %[[B]]
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entry:
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%b = load i8, i8* %a, align 4
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ret i8 %b
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}
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define i8 @test_load_notmyattr(i8* %a) sanitize_address {
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; CHECK-LABEL: @test_load_notmyattr(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %[[B:[^ ]*]] = load i8, i8* %a
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; CHECK-NEXT: ret i8 %[[B]]
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entry:
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%b = load i8, i8* %a, align 4
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ret i8 %b
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}
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define i8 @test_load_addrspace(i8 addrspace(256)* %a) sanitize_hwaddress {
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; CHECK-LABEL: @test_load_addrspace(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %[[B:[^ ]*]] = load i8, i8 addrspace(256)* %a
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; CHECK-NEXT: ret i8 %[[B]]
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entry:
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%b = load i8, i8 addrspace(256)* %a, align 4
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ret i8 %b
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}
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; CHECK: declare void @__hwasan_init()
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; CHECK: define internal void @hwasan.module_ctor() #[[#]] comdat {
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; CHECK-NEXT: call void @__hwasan_init()
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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