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Strip libgcc to only keep fallback symbols

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We use libgcc as fallback for symbols not present in libclang_rt
builtins, however we didn't know what exact symbols were being used,
some may not be intended to fallback.

Create libgcc_stripped, which only contains unwind symbols from libgcc.

Bug: 29275768
Test: bionic-unit-tests
Change-Id: I5b349fa6138e51663bf3b67109b880b4356da8e8
This commit is contained in:
Yi Kong 2019-03-29 20:05:14 -07:00
parent feef2ef4d7
commit acee27cd72
9 changed files with 201 additions and 27 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

111
Android.bp
View file

@ -482,6 +482,117 @@ toolchain_library {
},
}
toolchain_library {
name: "libgcc_stripped",
defaults: ["linux_bionic_supported"],
vendor_available: true,
recovery_available: true,
arch: {
arm: {
src: "prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.9/lib/gcc/arm-linux-androideabi/4.9.x/libgcc.a",
strip: {
keep_symbols_list: [
// unwind-arm.o
"_Unwind_Complete",
"_Unwind_DeleteException",
"_Unwind_GetCFA",
"_Unwind_VRS_Get",
"_Unwind_VRS_Pop",
"_Unwind_VRS_Set",
"__aeabi_unwind_cpp_pr0",
"__aeabi_unwind_cpp_pr1",
"__aeabi_unwind_cpp_pr2",
"__gnu_Unwind_Backtrace",
"__gnu_Unwind_ForcedUnwind",
"__gnu_Unwind_RaiseException",
"__gnu_Unwind_Resume",
"__gnu_Unwind_Resume_or_Rethrow",
// libunwind.o
"_Unwind_Backtrace",
"_Unwind_ForcedUnwind",
"_Unwind_RaiseException",
"_Unwind_Resume",
"_Unwind_Resume_or_Rethrow",
"___Unwind_Backtrace",
"___Unwind_ForcedUnwind",
"___Unwind_RaiseException",
"___Unwind_Resume",
"___Unwind_Resume_or_Rethrow",
"__gnu_Unwind_Restore_VFP",
"__gnu_Unwind_Restore_VFP_D",
"__gnu_Unwind_Restore_VFP_D_16_to_31",
"__gnu_Unwind_Restore_WMMXC",
"__gnu_Unwind_Restore_WMMXD",
"__gnu_Unwind_Save_VFP",
"__gnu_Unwind_Save_VFP_D",
"__gnu_Unwind_Save_VFP_D_16_to_31",
"__gnu_Unwind_Save_WMMXC",
"__gnu_Unwind_Save_WMMXD",
"__restore_core_regs",
"restore_core_regs",
// pr-support.o
"_Unwind_GetDataRelBase",
"_Unwind_GetLanguageSpecificData",
"_Unwind_GetRegionStart",
"_Unwind_GetTextRelBase",
"__gnu_unwind_execute",
"__gnu_unwind_frame",
],
use_gnu_strip: true,
},
},
arm64: {
src: "prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/lib/gcc/aarch64-linux-android/4.9.x/libgcc.a",
},
x86: {
src: "prebuilts/gcc/linux-x86/x86/x86_64-linux-android-4.9/lib/gcc/x86_64-linux-android/4.9.x/32/libgcc.a",
},
x86_64: {
src: "prebuilts/gcc/linux-x86/x86/x86_64-linux-android-4.9/lib/gcc/x86_64-linux-android/4.9.x/libgcc.a",
},
},
strip: {
keep_symbols_list: [
// unwind-dw2.o
"_Unwind_Backtrace",
"_Unwind_DeleteException",
"_Unwind_FindEnclosingFunction",
"_Unwind_ForcedUnwind",
"_Unwind_GetCFA",
"_Unwind_GetDataRelBase",
"_Unwind_GetGR",
"_Unwind_GetIP",
"_Unwind_GetIPInfo",
"_Unwind_GetLanguageSpecificData",
"_Unwind_GetRegionStart",
"_Unwind_GetTextRelBase",
"_Unwind_RaiseException",
"_Unwind_Resume",
"_Unwind_Resume_or_Rethrow",
"_Unwind_SetGR",
"_Unwind_SetIP",
"__frame_state_for",
// unwind-dw2-fde-dip.o
"_Unwind_Find_FDE",
"__deregister_frame",
"__deregister_frame_info",
"__deregister_frame_info_bases",
"__register_frame",
"__register_frame_info",
"__register_frame_info_bases",
"__register_frame_info_table",
"__register_frame_info_table_bases",
"__register_frame_table",
],
use_gnu_strip: true,
},
}
toolchain_library {
name: "libwinpthread",
host_supported: true,

7
apex/apex_test.go
View file

@ -92,6 +92,13 @@ func testApex(t *testing.T, bp string) *android.TestContext {
recovery_available: true,
}
toolchain_library {
name: "libgcc_stripped",
src: "",
vendor_available: true,
recovery_available: true,
}
toolchain_library {
name: "libclang_rt.builtins-aarch64-android",
src: "",

4
cc/builder.go
View file

@ -255,6 +255,7 @@ type builderFlags struct {
groupStaticLibs bool
stripKeepSymbols bool
stripKeepSymbolsList string
stripKeepMiniDebugInfo bool
stripAddGnuDebuglink bool
stripUseGnuStrip bool
@ -835,6 +836,9 @@ func TransformStrip(ctx android.ModuleContext, inputFile android.Path,
if flags.stripKeepSymbols {
args += " --keep-symbols"
}
if flags.stripKeepSymbolsList != "" {
args += " -k" + flags.stripKeepSymbolsList
}
if flags.stripUseGnuStrip {
args += " --use-gnu-strip"
}

4
cc/cc_test.go
View file

@ -1833,13 +1833,13 @@ func TestStaticLibDepExport(t *testing.T) {
// Check the shared version of lib2.
variant := "android_arm64_armv8-a_core_shared"
module := ctx.ModuleForTests("lib2", variant).Module().(*Module)
checkStaticLibs(t, []string{"lib1", "libclang_rt.builtins-aarch64-android", "libatomic", "libgcc"}, module)
checkStaticLibs(t, []string{"lib1", "libclang_rt.builtins-aarch64-android", "libatomic", "libgcc_stripped"}, module)
// Check the static version of lib2.
variant = "android_arm64_armv8-a_core_static"
module = ctx.ModuleForTests("lib2", variant).Module().(*Module)
// libc++_static is linked additionally.
checkStaticLibs(t, []string{"lib1", "libc++_static", "libclang_rt.builtins-aarch64-android", "libatomic", "libgcc"}, module)
checkStaticLibs(t, []string{"lib1", "libc++_static", "libclang_rt.builtins-aarch64-android", "libatomic", "libgcc_stripped"}, module)
}
var compilerFlagsTestCases = []struct {

8
cc/linker.go
View file

@ -228,10 +228,10 @@ func (linker *baseLinker) linkerDeps(ctx DepsContext, deps Deps) Deps {
// libclang_rt.builtins, libgcc and libatomic have to be last on the command line
if !Bool(linker.Properties.No_libcrt) {
deps.LateStaticLibs = append(deps.LateStaticLibs, config.BuiltinsRuntimeLibrary(ctx.toolchain()))
}
deps.LateStaticLibs = append(deps.LateStaticLibs, "libatomic")
if !Bool(linker.Properties.No_libgcc) {
deps.LateStaticLibs = append(deps.LateStaticLibs, "libatomic")
deps.LateStaticLibs = append(deps.LateStaticLibs, "libgcc_stripped")
} else if !Bool(linker.Properties.No_libgcc) {
deps.LateStaticLibs = append(deps.LateStaticLibs, "libatomic")
deps.LateStaticLibs = append(deps.LateStaticLibs, "libgcc")
}

17
cc/strip.go
View file

@ -15,15 +15,19 @@
package cc
import (
"strings"
"android/soong/android"
)
type StripProperties struct {
Strip struct {
None *bool
All *bool
Keep_symbols *bool
}
None *bool `android:"arch_variant"`
All *bool `android:"arch_variant"`
Keep_symbols *bool `android:"arch_variant"`
Keep_symbols_list []string `android:"arch_variant"`
Use_gnu_strip *bool `android:"arch_variant"`
} `android:"arch_variant"`
}
type stripper struct {
@ -42,9 +46,14 @@ func (stripper *stripper) strip(ctx ModuleContext, in android.Path, out android.
} else {
if Bool(stripper.StripProperties.Strip.Keep_symbols) {
flags.stripKeepSymbols = true
} else if len(stripper.StripProperties.Strip.Keep_symbols_list) > 0 {
flags.stripKeepSymbolsList = strings.Join(stripper.StripProperties.Strip.Keep_symbols_list, ",")
} else if !Bool(stripper.StripProperties.Strip.All) {
flags.stripKeepMiniDebugInfo = true
}
if Bool(stripper.StripProperties.Strip.Use_gnu_strip) {
flags.stripUseGnuStrip = true
}
if ctx.Config().Debuggable() && !flags.stripKeepMiniDebugInfo {
flags.stripAddGnuDebuglink = true
}

7
cc/testing.go
View file

@ -69,6 +69,13 @@ func GatherRequiredDepsForTest(os android.OsType) string {
src: "",
}
toolchain_library {
name: "libgcc_stripped",
vendor_available: true,
recovery_available: true,
src: "",
}
cc_library {
name: "libc",
no_libgcc: true,

16
cc/toolchain_library.go
View file

@ -34,6 +34,8 @@ type toolchainLibraryProperties struct {
type toolchainLibraryDecorator struct {
*libraryDecorator
stripper
Properties toolchainLibraryProperties
}
@ -45,7 +47,7 @@ func (*toolchainLibraryDecorator) linkerDeps(ctx DepsContext, deps Deps) Deps {
func (library *toolchainLibraryDecorator) linkerProps() []interface{} {
var props []interface{}
props = append(props, library.libraryDecorator.linkerProps()...)
return append(props, &library.Properties)
return append(props, &library.Properties, &library.stripper.StripProperties)
}
// toolchain_library is used internally by the build tool to link the specified
@ -78,7 +80,17 @@ func (library *toolchainLibraryDecorator) link(ctx ModuleContext,
return android.PathForSource(ctx, "")
}
return android.PathForSource(ctx, *library.Properties.Src)
srcPath := android.PathForSource(ctx, *library.Properties.Src)
if library.stripper.StripProperties.Strip.Keep_symbols_list != nil {
fileName := ctx.ModuleName() + staticLibraryExtension
outputFile := android.PathForModuleOut(ctx, fileName)
buildFlags := flagsToBuilderFlags(flags)
library.stripper.strip(ctx, srcPath, outputFile, buildFlags)
return outputFile
}
return srcPath
}
func (library *toolchainLibraryDecorator) nativeCoverage() bool {

54
scripts/strip.sh
View file

@ -24,6 +24,7 @@
# -i ${file}: input file (required)
# -o ${file}: output file (required)
# -d ${file}: deps file (required)
# -k symbols: Symbols to keep (optional)
# --add-gnu-debuglink
# --keep-mini-debug-info
# --keep-symbols
@ -32,11 +33,11 @@
set -o pipefail
OPTSTRING=d:i:o:-:
OPTSTRING=d:i:o:k:-:
usage() {
cat <<EOF
Usage: strip.sh [options] -i in-file -o out-file -d deps-file
Usage: strip.sh [options] -k symbols -i in-file -o out-file -d deps-file
Options:
--add-gnu-debuglink Add a gnu-debuglink section to out-file
--keep-mini-debug-info Keep compressed debug info in out-file
@ -71,6 +72,20 @@ do_strip_keep_symbols() {
fi
}
do_strip_keep_symbol_list() {
if [ -z "${use_gnu_strip}" ]; then
echo "do_strip_keep_symbol_list does not work with llvm-objcopy"
echo "http://b/131631155"
usage
fi
echo "${symbols_to_keep}" | tr ',' '\n' > "${outfile}.symbolList"
KEEP_SYMBOLS="-w --strip-unneeded-symbol=* --keep-symbols="
KEEP_SYMBOLS+="${outfile}.symbolList"
"${CROSS_COMPILE}objcopy" "${infile}" "${outfile}.tmp" ${KEEP_SYMBOLS}
}
do_strip_keep_mini_debug_info() {
rm -f "${outfile}.dynsyms" "${outfile}.funcsyms" "${outfile}.keep_symbols" "${outfile}.debug" "${outfile}.mini_debuginfo" "${outfile}.mini_debuginfo.xz"
local fail=
@ -124,19 +139,21 @@ do_remove_build_id() {
while getopts $OPTSTRING opt; do
case "$opt" in
d) depsfile="${OPTARG}" ;;
i) infile="${OPTARG}" ;;
o) outfile="${OPTARG}" ;;
-)
case "${OPTARG}" in
add-gnu-debuglink) add_gnu_debuglink=true ;;
keep-mini-debug-info) keep_mini_debug_info=true ;;
keep-symbols) keep_symbols=true ;;
remove-build-id) remove_build_id=true ;;
*) echo "Unknown option --${OPTARG}"; usage ;;
esac;;
?) usage ;;
*) echo "'${opt}' '${OPTARG}'"
d) depsfile="${OPTARG}" ;;
i) infile="${OPTARG}" ;;
o) outfile="${OPTARG}" ;;
k) symbols_to_keep="${OPTARG}" ;;
-)
case "${OPTARG}" in
add-gnu-debuglink) add_gnu_debuglink=true ;;
keep-mini-debug-info) keep_mini_debug_info=true ;;
keep-symbols) keep_symbols=true ;;
remove-build-id) remove_build_id=true ;;
use-gnu-strip) use_gnu_strip=true ;;
*) echo "Unknown option --${OPTARG}"; usage ;;
esac;;
?) usage ;;
*) echo "'${opt}' '${OPTARG}'"
esac
done
@ -160,6 +177,11 @@ if [ ! -z "${keep_symbols}" -a ! -z "${keep_mini_debug_info}" ]; then
usage
fi
if [ ! -z "${symbols_to_keep}" -a ! -z "${keep_symbols}" ]; then
echo "--keep-symbols and -k cannot be used together"
usage
fi
if [ ! -z "${add_gnu_debuglink}" -a ! -z "${keep_mini_debug_info}" ]; then
echo "--add-gnu-debuglink cannot be used with --keep-mini-debug-info"
usage
@ -169,6 +191,8 @@ rm -f "${outfile}.tmp"
if [ ! -z "${keep_symbols}" ]; then
do_strip_keep_symbols
elif [ ! -z "${symbols_to_keep}" ]; then
do_strip_keep_symbol_list
elif [ ! -z "${keep_mini_debug_info}" ]; then
do_strip_keep_mini_debug_info
else