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0001-GR-15965-llvm-objcopy-add-set-section-flags-function.patch
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From a4188558ad8d61db636533799f3328bad3d8eced Mon Sep 17 00:00:00 2001
From: Josef Eisl <[email protected]>
Date: Tue, 18 Dec 2018 12:58:34 +0100
Subject: [PATCH 1/4] [GR-15965] [llvm-objcopy] add --set-section-flags
functionality
---
.../set-section-flags-osproc-mask.test | 115 ++++++++++++++++++
.../set-section-flags-preserved.test | 74 +++++++++++
.../tools/llvm-objcopy/set-section-flags.test | 60 +++++++++
llvm/tools/llvm-objcopy/CopyConfig.cpp | 46 +++++++
llvm/tools/llvm-objcopy/CopyConfig.h | 6 +
llvm/tools/llvm-objcopy/ELF/ELFObjcopy.cpp | 17 +++
llvm/tools/llvm-objcopy/ObjcopyOpts.td | 6 +
7 files changed, 324 insertions(+)
create mode 100644 llvm/test/tools/llvm-objcopy/set-section-flags-osproc-mask.test
create mode 100644 llvm/test/tools/llvm-objcopy/set-section-flags-preserved.test
create mode 100644 llvm/test/tools/llvm-objcopy/set-section-flags.test
diff --git a/llvm/test/tools/llvm-objcopy/set-section-flags-osproc-mask.test b/llvm/test/tools/llvm-objcopy/set-section-flags-osproc-mask.test
new file mode 100644
index 00000000000..ca4870d539d
--- /dev/null
+++ b/llvm/test/tools/llvm-objcopy/set-section-flags-osproc-mask.test
@@ -0,0 +1,115 @@
+# Test that cpu/processor-specific SHF_* flags are preserved.
+
+# ===== x86_64 =====
+
+# RUN: yaml2obj -docnum 1 %s > %t-x86_64.o
+# RUN: llvm-objcopy --set-section-flags=.foo=alloc %t-x86_64.o
+# RUN: llvm-readobj -sections %t-x86_64.o | FileCheck %s --check-prefix=X86_64
+
+--- !ELF
+FileHeader:
+ Class: ELFCLASS64
+ Data: ELFDATA2LSB
+ Type: ET_REL
+ Machine: EM_X86_64
+Sections:
+ - Name: .foo
+ Type: SHT_PROGBITS
+ Flags: [ SHF_X86_64_LARGE ]
+
+# X86_64: Name: .foo
+# X86_64-NEXT: Type: SHT_PROGBITS
+# X86_64-NEXT: Flags [
+# X86_64-NEXT: SHF_ALLOC (0x2)
+# X86_64-NEXT: SHF_WRITE (0x1)
+# X86_64-NEXT: SHF_X86_64_LARGE (0x10000000)
+# X86_64-NEXT: ]
+
+# ===== hex =====
+
+# RUN: yaml2obj -docnum 2 %s > %t-hex.o
+# RUN: llvm-objcopy --set-section-flags=.foo=alloc %t-hex.o
+# RUN: llvm-readobj -sections %t-hex.o | FileCheck %s --check-prefix=HEX
+
+--- !ELF
+FileHeader:
+ Class: ELFCLASS64
+ Data: ELFDATA2LSB
+ Type: ET_REL
+ Machine: EM_HEXAGON
+Sections:
+ - Name: .foo
+ Type: SHT_PROGBITS
+ Flags: [ SHF_HEX_GPREL ]
+
+# HEX: Name: .foo
+# HEX-NEXT: Type: SHT_PROGBITS
+# HEX-NEXT: Flags [
+# HEX-NEXT: SHF_ALLOC (0x2)
+# HEX-NEXT: SHF_HEX_GPREL (0x10000000)
+# HEX-NEXT: SHF_WRITE (0x1)
+# HEX-NEXT: ]
+
+# ===== mips =====
+
+# RUN: yaml2obj -docnum 3 %s > %t-mips.o
+# RUN: llvm-objcopy --set-section-flags=.foo=alloc %t-mips.o
+# RUN: llvm-readobj -sections %t-mips.o | FileCheck %s --check-prefix=MIPS
+
+--- !ELF
+FileHeader:
+ Class: ELFCLASS64
+ Data: ELFDATA2LSB
+ Type: ET_REL
+ Machine: EM_MIPS
+Sections:
+ - Name: .foo
+ Type: SHT_PROGBITS
+ Flags: [ SHF_MIPS_NODUPES, SHF_MIPS_NAMES, SHF_MIPS_LOCAL,
+ SHF_MIPS_NOSTRIP, SHF_MIPS_GPREL, SHF_MIPS_MERGE,
+ SHF_MIPS_ADDR, SHF_MIPS_STRING ]
+
+# Note: llvm-readobj prints SHF_EXCLUDE/SHF_MASKPROC since specifying all
+# SHF_MIPS_* flags covers the same bitset.
+
+# MIPS: Name: .foo
+# MIPS-NEXT: Type: SHT_PROGBITS
+# MIPS-NEXT: Flags [
+# MIPS-NEXT: SHF_ALLOC (0x2)
+# MIPS-NEXT: SHF_EXCLUDE (0x80000000)
+# MIPS-NEXT: SHF_MASKPROC (0xF0000000)
+# MIPS-NEXT: SHF_MIPS_ADDR (0x40000000)
+# MIPS-NEXT: SHF_MIPS_GPREL (0x10000000)
+# MIPS-NEXT: SHF_MIPS_LOCAL (0x4000000)
+# MIPS-NEXT: SHF_MIPS_MERGE (0x20000000)
+# MIPS-NEXT: SHF_MIPS_NAMES (0x2000000)
+# MIPS-NEXT: SHF_MIPS_NODUPES (0x1000000)
+# MIPS-NEXT: SHF_MIPS_NOSTRIP (0x8000000)
+# MIPS-NEXT: SHF_MIPS_STRING (0x80000000)
+# MIPS-NEXT: SHF_WRITE (0x1)
+# MIPS-NEXT: ]
+
+# ===== arm =====
+
+# RUN: yaml2obj -docnum 4 %s > %t-arm.o
+# RUN: llvm-objcopy --set-section-flags=.foo=alloc %t-arm.o
+# RUN: llvm-readobj -sections %t-arm.o | FileCheck %s --check-prefix=ARM
+
+--- !ELF
+FileHeader:
+ Class: ELFCLASS64
+ Data: ELFDATA2LSB
+ Type: ET_REL
+ Machine: EM_ARM
+Sections:
+ - Name: .foo
+ Type: SHT_PROGBITS
+ Flags: [ SHF_ARM_PURECODE ]
+
+# ARM: Name: .foo
+# ARM-NEXT: Type: SHT_PROGBITS
+# ARM-NEXT: Flags [
+# ARM-NEXT: SHF_ALLOC (0x2)
+# ARM-NEXT: SHF_ARM_PURECODE (0x20000000)
+# ARM-NEXT: SHF_WRITE (0x1)
+# ARM-NEXT: ]
diff --git a/llvm/test/tools/llvm-objcopy/set-section-flags-preserved.test b/llvm/test/tools/llvm-objcopy/set-section-flags-preserved.test
new file mode 100644
index 00000000000..ac97e6e06c0
--- /dev/null
+++ b/llvm/test/tools/llvm-objcopy/set-section-flags-preserved.test
@@ -0,0 +1,74 @@
+# RUN: yaml2obj %s > %t
+
+# Single flags on a section with all flags:
+# RUN: llvm-objcopy --set-section-flags=.foo=alloc %t %t.alloc
+# RUN: llvm-readobj -sections %t.alloc | FileCheck %s --check-prefixes=CHECK,ALLOC,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=load %t %t.load
+# RUN: llvm-readobj -sections %t.load | FileCheck %s --check-prefixes=CHECK,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=noload %t %t.noload
+# RUN: llvm-readobj -sections %t.noload | FileCheck %s --check-prefixes=CHECK,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=readonly %t %t.readonly
+# RUN: llvm-readobj -sections %t.readonly | FileCheck %s --check-prefixes=CHECK
+# RUN: llvm-objcopy --set-section-flags=.foo=debug %t %t.debug
+# RUN: llvm-readobj -sections %t.debug | FileCheck %s --check-prefixes=CHECK,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=code %t %t.code
+# RUN: llvm-readobj -sections %t.code | FileCheck %s --check-prefixes=CHECK,EXEC,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=data %t %t.data
+# RUN: llvm-readobj -sections %t.data | FileCheck %s --check-prefixes=CHECK,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=rom %t %t.rom
+# RUN: llvm-readobj -sections %t.rom | FileCheck %s --check-prefixes=CHECK,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=contents %t %t.contents
+# RUN: llvm-readobj -sections %t.contents | FileCheck %s --check-prefixes=CHECK,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=merge %t %t.merge
+# RUN: llvm-readobj -sections %t.merge | FileCheck %s --check-prefixes=CHECK,MERGE,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=strings %t %t.strings
+# RUN: llvm-readobj -sections %t.strings | FileCheck %s --check-prefixes=CHECK,STRINGS,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=share %t %t.share
+# RUN: llvm-readobj -sections %t.share | FileCheck %s --check-prefixes=CHECK,WRITE
+
+!ELF
+FileHeader:
+ Class: ELFCLASS64
+ Data: ELFDATA2LSB
+ Type: ET_REL
+ Machine: EM_X86_64
+Sections:
+ - Name: .infolink
+ Type: SHT_NOBITS
+ - Name: .group
+ Type: SHT_GROUP
+ Link: .symtab
+ Flags: [ ]
+ Info: dummy
+ Members:
+ - SectionOrType: GRP_COMDAT
+ - SectionOrType: .foo
+ - Name: .foo
+ Type: SHT_PROGBITS
+ Link: .infolink
+ Flags: [ SHF_ALLOC, SHF_COMPRESSED, SHF_EXCLUDE, SHF_EXECINSTR,
+ SHF_GROUP, SHF_INFO_LINK, SHF_LINK_ORDER, SHF_MERGE,
+ SHF_OS_NONCONFORMING, SHF_STRINGS, SHF_TLS, SHF_WRITE ]
+ Content: "a4a4a4a4"
+Symbols:
+ Local:
+ - Name: dummy
+ Section: .group
+
+# CHECK: Name: .foo
+# CHECK-NEXT: Type: SHT_PROGBITS
+# CHECK-NEXT: Flags [
+# ALLOC-NEXT: SHF_ALLOC (0x2)
+# CHECK-NEXT: SHF_COMPRESSED (0x800)
+# CHECK-NEXT: SHF_EXCLUDE (0x80000000)
+# EXEC-NEXT: SHF_EXECINSTR (0x4)
+# CHECK-NEXT: SHF_GROUP (0x200)
+# CHECK-NEXT: SHF_INFO_LINK (0x40)
+# CHECK-NEXT: SHF_LINK_ORDER (0x80)
+# MERGE-NEXT: SHF_MERGE (0x10)
+# STRINGS-NEXT: SHF_STRINGS (0x20)
+# CHECK-NEXT: SHF_TLS (0x400)
+# WRITE-NEXT: SHF_WRITE (0x1)
+# CHECK-NEXT: ]
+
+# BAD-FLAG: unrecognized section flag 'xyzzy'
diff --git a/llvm/test/tools/llvm-objcopy/set-section-flags.test b/llvm/test/tools/llvm-objcopy/set-section-flags.test
new file mode 100644
index 00000000000..adc2a162f0b
--- /dev/null
+++ b/llvm/test/tools/llvm-objcopy/set-section-flags.test
@@ -0,0 +1,60 @@
+# RUN: yaml2obj %s > %t
+
+# Single flags on a section with no flags:
+# RUN: llvm-objcopy --set-section-flags=.foo=alloc %t %t.alloc
+# RUN: llvm-readobj -sections %t.alloc | FileCheck %s --check-prefixes=CHECK,ALLOC,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=load %t %t.load
+# RUN: llvm-readobj -sections %t.load | FileCheck %s --check-prefixes=CHECK,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=noload %t %t.noload
+# RUN: llvm-readobj -sections %t.noload | FileCheck %s --check-prefixes=CHECK,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=readonly %t %t.readonly
+# RUN: llvm-readobj -sections %t.readonly | FileCheck %s --check-prefixes=CHECK
+# RUN: llvm-objcopy --set-section-flags=.foo=debug %t %t.debug
+# RUN: llvm-readobj -sections %t.debug | FileCheck %s --check-prefixes=CHECK,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=code %t %t.code
+# RUN: llvm-readobj -sections %t.code | FileCheck %s --check-prefixes=CHECK,EXEC,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=data %t %t.data
+# RUN: llvm-readobj -sections %t.data | FileCheck %s --check-prefixes=CHECK,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=rom %t %t.rom
+# RUN: llvm-readobj -sections %t.rom | FileCheck %s --check-prefixes=CHECK,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=contents %t %t.contents
+# RUN: llvm-readobj -sections %t.contents | FileCheck %s --check-prefixes=CHECK,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=merge %t %t.merge
+# RUN: llvm-readobj -sections %t.merge | FileCheck %s --check-prefixes=CHECK,MERGE,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=strings %t %t.strings
+# RUN: llvm-readobj -sections %t.strings | FileCheck %s --check-prefixes=CHECK,STRINGS,WRITE
+# RUN: llvm-objcopy --set-section-flags=.foo=share %t %t.share
+# RUN: llvm-readobj -sections %t.share | FileCheck %s --check-prefixes=CHECK,WRITE
+
+# Multiple flags:
+# RUN: llvm-objcopy --set-section-flags=.foo=alloc,readonly,strings %t %t.alloc_ro_strings
+# RUN: llvm-readobj -sections %t.alloc_ro_strings | FileCheck %s --check-prefixes=CHECK,ALLOC,STRINGS
+# RUN: llvm-objcopy --set-section-flags=.foo=alloc,code %t %t.alloc_code
+# RUN: llvm-readobj -sections %t.alloc_code | FileCheck %s --check-prefixes=CHECK,ALLOC,EXEC,WRITE
+
+# Invalid flags:
+# RUN: not llvm-objcopy --set-section-flags=.foo=xyzzy %t %t.xyzzy 2>&1 | FileCheck %s --check-prefix=BAD-FLAG
+
+!ELF
+FileHeader:
+ Class: ELFCLASS64
+ Data: ELFDATA2LSB
+ Type: ET_REL
+ Machine: EM_X86_64
+Sections:
+ - Name: .foo
+ Type: SHT_PROGBITS
+ Flags: [ ]
+ Content: "c3c3c3c3"
+
+# CHECK: Name: .foo
+# CHECK-NEXT: Type: SHT_PROGBITS
+# CHECK-NEXT: Flags [
+# ALLOC-NEXT: SHF_ALLOC (0x2)
+# EXEC-NEXT: SHF_EXECINSTR (0x4)
+# MERGE-NEXT: SHF_MERGE (0x10)
+# STRINGS-NEXT: SHF_STRINGS (0x20)
+# WRITE-NEXT: SHF_WRITE (0x1)
+# CHECK-NEXT: ]
+
+# BAD-FLAG: Unrecognized section flag 'xyzzy'. Flags supported for GNU compatibility: alloc, load, noload, readonly, debug, code, data, rom, share, contents, merge, strings.
diff --git a/llvm/tools/llvm-objcopy/CopyConfig.cpp b/llvm/tools/llvm-objcopy/CopyConfig.cpp
index 3737f571ae6..5347afca570 100644
--- a/llvm/tools/llvm-objcopy/CopyConfig.cpp
+++ b/llvm/tools/llvm-objcopy/CopyConfig.cpp
@@ -171,6 +171,47 @@ static SectionRename parseRenameSectionValue(StringRef FlagValue) {
return SR;
}
+static SectionFlags parseSectionAddFlagsValue(StringRef FlagValue) {
+ if (!FlagValue.contains('='))
+ error("Bad format for --section-add-flags: missing '='");
+
+ // Section split: ".foo" = "f1,f2,..."
+ auto Section2Flags = FlagValue.split('=');
+ SectionFlags SR;
+ SR.Name = Section2Flags.first;
+
+ // Flags split: "f1" "f2" ...
+ SmallVector<StringRef, 6> NameAndFlags;
+ Section2Flags.second.split(NameAndFlags, ',');
+
+ if (NameAndFlags.size() > 0) {
+ SectionFlag Flags = SectionFlag::SecNone;
+ for (size_t I = 0, Size = NameAndFlags.size(); I < Size; ++I) {
+ SectionFlag Flag = parseSectionRenameFlag(NameAndFlags[I]);
+ if (Flag == SectionFlag::SecNone)
+ error("Unrecognized section flag '" + NameAndFlags[I] +
+ "'. Flags supported for GNU compatibility: alloc, load, noload, "
+ "readonly, debug, code, data, rom, share, contents, merge, "
+ "strings.");
+ Flags |= Flag;
+ }
+
+ SR.NewFlags = 0;
+ if (Flags & SectionFlag::SecAlloc)
+ SR.NewFlags |= ELF::SHF_ALLOC;
+ if (!(Flags & SectionFlag::SecReadonly))
+ SR.NewFlags |= ELF::SHF_WRITE;
+ if (Flags & SectionFlag::SecCode)
+ SR.NewFlags |= ELF::SHF_EXECINSTR;
+ if (Flags & SectionFlag::SecMerge)
+ SR.NewFlags |= ELF::SHF_MERGE;
+ if (Flags & SectionFlag::SecStrings)
+ SR.NewFlags |= ELF::SHF_STRINGS;
+ }
+
+ return SR;
+}
+
static const StringMap<MachineInfo> ArchMap{
// Name, {EMachine, 64bit, LittleEndian}
{"aarch64", {ELF::EM_AARCH64, true, true}},
@@ -328,6 +369,11 @@ DriverConfig parseObjcopyOptions(ArrayRef<const char *> ArgsArr) {
if (!Config.SectionsToRename.try_emplace(SR.OriginalName, SR).second)
error("Multiple renames of section " + SR.OriginalName);
}
+ for (auto Arg : InputArgs.filtered(OBJCOPY_set_section_flags)) {
+ SectionFlags SF = parseSectionAddFlagsValue(StringRef(Arg->getValue()));
+ if (!Config.SectionSetFlags.try_emplace(SF.Name, SF).second)
+ error("Multiple flags for section " + SF.Name);
+ }
for (auto Arg : InputArgs.filtered(OBJCOPY_remove_section))
Config.ToRemove.push_back(Arg->getValue());
diff --git a/llvm/tools/llvm-objcopy/CopyConfig.h b/llvm/tools/llvm-objcopy/CopyConfig.h
index 71a2423ae1c..bb5fbc1cb7d 100644
--- a/llvm/tools/llvm-objcopy/CopyConfig.h
+++ b/llvm/tools/llvm-objcopy/CopyConfig.h
@@ -38,6 +38,11 @@ struct SectionRename {
Optional<uint64_t> NewFlags;
};
+struct SectionFlags {
+ StringRef Name;
+ uint64_t NewFlags;
+};
+
// Configuration for copying/stripping a single file.
struct CopyConfig {
// Main input/output options
@@ -75,6 +80,7 @@ struct CopyConfig {
// Map options
StringMap<SectionRename> SectionsToRename;
StringMap<StringRef> SymbolsToRename;
+ StringMap<SectionFlags> SectionSetFlags;
// Boolean options
bool DeterministicArchives = true;
diff --git a/llvm/tools/llvm-objcopy/ELF/ELFObjcopy.cpp b/llvm/tools/llvm-objcopy/ELF/ELFObjcopy.cpp
index f5ab8e70826..9b33c4b35c5 100644
--- a/llvm/tools/llvm-objcopy/ELF/ELFObjcopy.cpp
+++ b/llvm/tools/llvm-objcopy/ELF/ELFObjcopy.cpp
@@ -517,6 +517,23 @@ static void handleArgs(const CopyConfig &Config, Object &Obj,
}
}
+ if (!Config.SectionSetFlags.empty()) {
+ for (auto &Sec : Obj.sections()) {
+ const auto Iter = Config.SectionSetFlags.find(Sec.Name);
+ if (Iter != Config.SectionSetFlags.end()) {
+ const SectionFlags &SF = Iter->second;
+ // Preserve some flags which should not be dropped when setting flags.
+ // Also, preserve anything OS/processor dependant.
+ const uint64_t PreserveMask = ELF::SHF_COMPRESSED | ELF::SHF_EXCLUDE |
+ ELF::SHF_GROUP | ELF::SHF_LINK_ORDER |
+ ELF::SHF_MASKOS | ELF::SHF_MASKPROC |
+ ELF::SHF_TLS | ELF::SHF_INFO_LINK;
+ Sec.Flags = (Sec.Flags & PreserveMask) |
+ (SF.NewFlags & ~PreserveMask);
+ }
+ }
+ }
+
if (!Config.DumpSection.empty()) {
for (const auto &Flag : Config.DumpSection) {
std::pair<StringRef, StringRef> SecPair = Flag.split("=");
diff --git a/llvm/tools/llvm-objcopy/ObjcopyOpts.td b/llvm/tools/llvm-objcopy/ObjcopyOpts.td
index 1f7e64e4091..43debb1a0a7 100644
--- a/llvm/tools/llvm-objcopy/ObjcopyOpts.td
+++ b/llvm/tools/llvm-objcopy/ObjcopyOpts.td
@@ -73,6 +73,12 @@ defm rename_section
"Flags supported for GNU compatibility: alloc, load, noload, "
"readonly, debug, code, data, rom, share, contents, merge, strings.">,
MetaVarName<"old=new[,flag1,...]">;
+defm set_section_flags
+ : Eq<"set-section-flags",
+ "Sets flags for section"
+ "Flags supported for GNU compatibility: alloc, load, noload, "
+ "readonly, debug, code, data, rom, share, contents, merge, strings.">,
+ MetaVarName<"section=flag1,flag2,...">;
defm redefine_symbol
: Eq<"redefine-sym", "Change the name of a symbol old to new">,
MetaVarName<"old=new">;
--
2.20.1