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Add a .note.android.ident section to Android ELF binaries.

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This allows debugging tools to know they are working with Android
binaries and adapt accordingly.

Signed-off-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
Signed-off-by: Michael Hope <michael.hope@linaro.org>

Change-Id: Ic906992fcad61c028bb765821637a3e1333bf52b
This commit is contained in:
Michael Hope 2012-07-31 16:18:22 +12:00
parent 1ee6e3b737
commit ea8fad11d9
3 changed files with 123 additions and 4 deletions
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40
libc/Android.mk
View file

@ -533,7 +533,12 @@ endif
# Needed to access private/__dso_handle.h from
# crtbegin_xxx.c and crtend_xxx.c
#
libc_crt_target_cflags += -I$(LOCAL_PATH)/private
libc_crt_target_cflags += -I$(LOCAL_PATH)/private \
-I$(LOCAL_PATH)/include \
-I$(LOCAL_PATH)/kernel/common \
-I$(LOCAL_PATH)/kernel/arch-$(TARGET_ARCH) \
-I$(LOCAL_PATH)/arch-$(TARGET_ARCH)/include \
-DPLATFORM_SDK_VERSION=$(PLATFORM_SDK_VERSION)
ifeq ($(TARGET_ARCH),arm)
libc_crt_target_cflags += -DCRT_LEGACY_WORKAROUND
@ -578,6 +583,22 @@ ifeq ($(TARGET_ARCH),x86)
libc_crt_target_crtstart_file := $(LOCAL_PATH)/arch-$(TARGET_ARCH)/bionic/crtbegin.S
libc_crt_target_crtstart_so_file := $(LOCAL_PATH)/arch-$(TARGET_ARCH)/bionic/crtbegin_so.S
endif
# See the comment in crtbrand.c for the reason why we need to generate
# crtbrand.s before generating crtbrand.o.
GEN := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbrand.s
$(GEN): $(LOCAL_PATH)/bionic/crtbrand.c
@mkdir -p $(dir $@)
$(TARGET_CC) $(libc_crt_target_so_cflags) -S -o $@ $<
sed -i -e '/\.note\.ABI-tag/s/progbits/note/' $@
ALL_GENERATED_SOURCES += $(GEN)
GEN := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbrand.o
$(GEN): $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbrand.s
@mkdir -p $(dir $@)
$(TARGET_CC) $(libc_crt_target_so_cflags) -o $@ -c $<
ALL_GENERATED_SOURCES += $(GEN)
GEN := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_so.o
$(GEN): $(libc_crt_target_crtstart_so_file)
@mkdir -p $(dir $@)
@ -604,19 +625,30 @@ ALL_GENERATED_SOURCES += $(GEN)
endif # TARGET_ARCH == x86 || TARGET_ARCH == arm
GEN := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_static1.o
$(GEN): $(libc_crt_target_crtstart_file)
@mkdir -p $(dir $@)
$(TARGET_CC) $(libc_crt_target_cflags) -o $@ -c $<
ALL_GENERATED_SOURCES += $(GEN)
GEN := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_static.o
$(GEN): $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_static1.o $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbrand.o
@mkdir -p $(dir $@)
$(TARGET_LD) -r -o $@ $^
ALL_GENERATED_SOURCES += $(GEN)
GEN := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_dynamic1.o
$(GEN): $(libc_crt_target_crtstart_file)
@mkdir -p $(dir $@)
$(TARGET_CC) $(libc_crt_target_cflags) -o $@ -c $<
ALL_GENERATED_SOURCES += $(GEN)
GEN := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_dynamic.o
$(GEN): $(libc_crt_target_crtstart_file)
$(GEN): $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_dynamic1.o $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbrand.o
@mkdir -p $(dir $@)
$(TARGET_CC) $(libc_crt_target_cflags) -o $@ -c $<
$(TARGET_LD) -r -o $@ $^
ALL_GENERATED_SOURCES += $(GEN)
# We rename crtend.o to crtend_android.o to avoid a
# name clash between gcc and bionic.
GEN := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_android.o

24
libc/NOTICE
View file

@ -380,3 +380,27 @@ OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
Copyright 2000 David E. O'Brien, John D. Polstra.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

63
libc/bionic/crtbrand.c Normal file
View file

@ -0,0 +1,63 @@
/*-
* Copyright 2000 David E. O'Brien, John D. Polstra.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdint.h>
#define ABI_VENDOR "Android"
#define ABI_SECTION ".note.android.ident"
#define ABI_NOTETYPE 1
#define ABI_ANDROID_API PLATFORM_SDK_VERSION
/*
* Special ".note" entry to tag an Android binary and specify the ABI version.
*
* For all arches except sparc, gcc emits the section directive for the
* following struct with a PROGBITS type. However, the section should be
* of NOTE type, according to the Generic SysV ABI spec.
*
* Unfortunately, there is no clean way to tell gcc to use another section type,
* so this C file (or the C file that includes it) must be compiled in multiple
* steps:
*
* - Compile the .c file to a .s file.
* - Edit the .s file to change the 'progbits' type to 'note', for the section
* directive that defines the .note.ABI-tag section.
* - Compile the .s file to an object file.
*
* These steps are done in the invididual Makefiles for each applicable arch.
*/
static const struct {
int32_t namesz;
int32_t descsz;
int32_t type;
char name[sizeof ABI_VENDOR];
int32_t android_api;
} abitag __attribute__ ((section (ABI_SECTION), aligned(4), used)) = {
sizeof ABI_VENDOR,
sizeof(int32_t),
ABI_NOTETYPE,
ABI_VENDOR,
ABI_ANDROID_API,
};