[PATCH] D106942: Consider section flags when adding section
Alfonso Sanchez-Beato via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Sat Jul 31 08:35:12 PDT 2021
alfonsosanchezbeato updated this revision to Diff 363300.
alfonsosanchezbeato added a comment.
Test added
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D106942/new/
https://reviews.llvm.org/D106942
Files:
llvm/test/tools/llvm-objcopy/COFF/set-flags-on-setion-added.test
llvm/tools/llvm-objcopy/COFF/COFFObjcopy.cpp
Index: llvm/tools/llvm-objcopy/COFF/COFFObjcopy.cpp
===================================================================
--- llvm/tools/llvm-objcopy/COFF/COFFObjcopy.cpp
+++ llvm/tools/llvm-objcopy/COFF/COFFObjcopy.cpp
@@ -94,7 +94,7 @@
return Error::success();
}
-static void setSectionFlags(Section &Sec, SectionFlag AllFlags) {
+static uint32_t flagsToCharacteristics(SectionFlag AllFlags, uint32_t OldChar) {
// Need to preserve alignment flags.
const uint32_t PreserveMask =
IMAGE_SCN_ALIGN_1BYTES | IMAGE_SCN_ALIGN_2BYTES | IMAGE_SCN_ALIGN_4BYTES |
@@ -107,8 +107,7 @@
// Setup new section characteristics based on the flags provided in command
// line.
- uint32_t NewCharacteristics =
- (Sec.Header.Characteristics & PreserveMask) | IMAGE_SCN_MEM_READ;
+ uint32_t NewCharacteristics = (OldChar & PreserveMask) | IMAGE_SCN_MEM_READ;
if ((AllFlags & SectionFlag::SecAlloc) && !(AllFlags & SectionFlag::SecLoad))
NewCharacteristics |= IMAGE_SCN_CNT_UNINITIALIZED_DATA;
@@ -128,7 +127,7 @@
if (AllFlags & SectionFlag::SecExclude)
NewCharacteristics |= IMAGE_SCN_LNK_REMOVE;
- Sec.Header.Characteristics = NewCharacteristics;
+ return NewCharacteristics;
}
static Error handleArgs(const CommonConfig &Config, Object &Obj) {
@@ -226,7 +225,8 @@
for (Section &Sec : Obj.getMutableSections()) {
const auto It = Config.SetSectionFlags.find(Sec.Name);
if (It != Config.SetSectionFlags.end())
- setSectionFlags(Sec, It->second.NewFlags);
+ Sec.Header.Characteristics = flagsToCharacteristics(
+ It->second.NewFlags, Sec.Header.Characteristics);
}
for (const auto &Flag : Config.AddSection) {
@@ -238,11 +238,19 @@
return createFileError(FileName, errorCodeToError(BufOrErr.getError()));
auto Buf = std::move(*BufOrErr);
+ uint32_t Characteristics;
+ const auto It = Config.SetSectionFlags.find(SecName);
+ if (It != Config.SetSectionFlags.end())
+ Characteristics =
+ flagsToCharacteristics(It->second.NewFlags, 0);
+ else
+ Characteristics = IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_ALIGN_1BYTES;
+
addSection(
Obj, SecName,
makeArrayRef(reinterpret_cast<const uint8_t *>(Buf->getBufferStart()),
Buf->getBufferSize()),
- IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_ALIGN_1BYTES);
+ Characteristics);
}
if (!Config.AddGnuDebugLink.empty())
Index: llvm/test/tools/llvm-objcopy/COFF/set-flags-on-setion-added.test
===================================================================
--- /dev/null
+++ llvm/test/tools/llvm-objcopy/COFF/set-flags-on-setion-added.test
@@ -0,0 +1,23 @@
+# RUN: yaml2obj %s -o %t
+
+## Test that llvm-objcopy can add sections and set its flags in the same
+## call.
+# RUN: echo DEADBEEF > %t.sec
+# RUN: llvm-objcopy --set-section-flags=.test.section1=code --add-section=.test.section1=%t.sec --set-section-flags=.test.section2=data --add-section=.test.section2=%t.sec %t %t1
+# RUN: llvm-readobj --sections --section-data %t1 | FileCheck %s --check-prefixes=CHECK-ADD
+
+# CHECK-ADD: Name: .test.section1
+# CHECK-ADD-NEXT: VirtualSize: 0x9
+# CHECK-ADD-NEXT: VirtualAddress: 0x0
+# CHECK-ADD: Name: .test.section2
+# CHECK-ADD-NEXT: VirtualSize: 0x9
+# CHECK-ADD-NEXT: VirtualAddress: 0x9
+
+
+--- !COFF
+header:
+ Machine: IMAGE_FILE_MACHINE_AMD64
+ Characteristics: [ ]
+sections:
+symbols:
+...
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