Merge commit '994b68f5c7d637d2945c06260fe35b266c10379d' * commit '994b68f5c7d637d2945c06260fe35b266c10379d': Fix __get_tls() in static C library to use kernel helpers.
This commit is contained in:
David 'Digit' Turner
Android Git Automerger
commit
db0017e5e2
3 changed files with 74 additions and 15 deletions
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@ -64,7 +64,6 @@ libc_common_src_files := \
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unistd/sleep.c \
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unistd/statfs.c \
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unistd/strsignal.c \
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unistd/sysconf.c \
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unistd/syslog.c \
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unistd/system.c \
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unistd/tcgetpgrp.c \
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@ -249,7 +248,6 @@ libc_common_src_files := \
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tzcode/localtime.c \
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tzcode/strftime.c \
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tzcode/strptime.c \
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bionic/__errno.c \
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bionic/__set_errno.c \
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bionic/_rand48.c \
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bionic/cpuacct.c \
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@ -318,6 +316,23 @@ libc_common_src_files := \
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regex/regexec.c \
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regex/regfree.c \
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# The following files are common, but must be compiled
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# with different C flags when building a static C library.
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#
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# The reason for this is the implementation of __get_tls()
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# that will differ between the shared and static versions
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# of the library.
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#
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# See comments in private/bionic_tls.h for more details.
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#
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# NOTE: bionic/pthread.c is added later to this list
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# because it needs special handling on ARM, see
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# below.
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#
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libc_static_common_src_files := \
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unistd/sysconf.c \
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bionic/__errno.c \
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# Architecture specific source files go here
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# =========================================================
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ifeq ($(TARGET_ARCH),arm)
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@ -352,12 +367,14 @@ libc_common_src_files += \
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# can set breakpoints in them without messing
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# up any thumb code.
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libc_common_src_files += \
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bionic/pthread.c.arm \
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bionic/pthread-atfork.c.arm \
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bionic/pthread-rwlocks.c.arm \
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bionic/pthread-timers.c.arm \
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bionic/ptrace.c.arm
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libc_static_common_src_files += \
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bionic/pthread.c.arm \
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# these are used by the static and dynamic versions of the libc
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# respectively
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libc_arch_static_src_files := \
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@ -388,12 +405,14 @@ libc_common_src_files += \
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arch-x86/string/strcmp_wrapper.S \
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arch-x86/string/strncmp_wrapper.S \
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arch-x86/string/strlen.S \
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bionic/pthread.c \
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bionic/pthread-atfork.c \
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bionic/pthread-rwlocks.c \
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bionic/pthread-timers.c \
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bionic/ptrace.c
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libc_static_common_src_files += \
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bionic/pthread.c \
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# this is needed for static versions of libc
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libc_arch_static_src_files := \
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arch-x86/bionic/dl_iterate_phdr_static.c
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@ -426,12 +445,15 @@ libc_common_src_files += \
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string/strncmp.c \
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string/memcmp.c \
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string/strlen.c \
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bionic/pthread.c \
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bionic/pthread-atfork.c \
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bionic/pthread-rwlocks.c \
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bionic/pthread-timers.c \
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bionic/ptrace.c \
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unistd/socketcalls.c
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libc_static_common_src_files += \
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bionic/pthread.c \
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endif # sh
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endif # !x86
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@ -595,10 +617,12 @@ include $(CLEAR_VARS)
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LOCAL_SRC_FILES := \
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$(libc_arch_static_src_files) \
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$(libc_static_common_src_files) \
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bionic/libc_init_static.c
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LOCAL_C_INCLUDES := $(libc_common_c_includes)
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LOCAL_CFLAGS := $(libc_common_cflags)
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LOCAL_CFLAGS := $(libc_common_cflags) \
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-DLIBC_STATIC
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LOCAL_MODULE := libc_nomalloc
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LOCAL_WHOLE_STATIC_LIBRARIES := libc_common
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@ -614,6 +638,7 @@ include $(CLEAR_VARS)
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LOCAL_SRC_FILES := \
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$(libc_arch_static_src_files) \
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$(libc_static_common_src_files) \
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bionic/dlmalloc.c \
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bionic/malloc_debug_common.c \
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bionic/libc_init_static.c
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@ -638,6 +663,7 @@ LOCAL_C_INCLUDES := $(libc_common_c_includes)
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LOCAL_SRC_FILES := \
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$(libc_arch_dynamic_src_files) \
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$(libc_static_common_src_files) \
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bionic/dlmalloc.c \
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bionic/malloc_debug_common.c \
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bionic/libc_init_dynamic.c
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@ -75,6 +75,13 @@ Differences between current and Android 2.2:
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- <dlfcn.h>: fixed dlopen() implementation to support dlopen(NULL, ...).
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This allows one to look at the dynamic symbols exported by an executable.
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- <private/bionic_tls.h>: use kernel helper functions for static versions
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of the C library. This is necessary because we don't know where the corresponding
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machine code is going to run, and the optimization for __get_tls() might
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not match the features of the target device where we run a static executable
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linked to the C library. This fixes one of the bug that explains why gdbserver
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didn't work well with threads.
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-------------------------------------------------------------------------------
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Differences between Android 2.2. and Android 2.1:
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@ -88,22 +88,48 @@ extern int __set_tls(void *ptr);
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/* get the TLS */
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#ifdef __arm__
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/* Linux kernel helpers for its TLS implementation */
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/* For performance reasons, avoid calling the kernel helper
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/* The standard way to get the TLS is to call a kernel helper
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* function (i.e. a function provided at a fixed address in a
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* "magic page" mapped in all user-space address spaces ), which
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* contains the most appropriate code path for the target device.
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*
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* However, for performance reasons, we're going to use our own
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* machine code for the system's C shared library.
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*
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* We cannot use this optimization in the static version of the
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* C library, because we don't know where the corresponding code
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* is going to run.
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*/
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# ifdef LIBC_STATIC
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/* Use the kernel helper in static C library. */
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typedef volatile void* (__kernel_get_tls_t)(void);
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# define __get_tls() (*(__kernel_get_tls_t *)0xffff0fe0)()
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# else /* !LIBC_STATIC */
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/* Use optimized code path.
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* Note that HAVE_ARM_TLS_REGISTER is build-specific
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* (it must match your kernel configuration)
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*/
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# ifdef HAVE_ARM_TLS_REGISTER
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# define __get_tls() \
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# ifdef HAVE_ARM_TLS_REGISTER
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/* We can read the address directly from a coprocessor
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* register, which avoids touching the data cache
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* completely.
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*/
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# define __get_tls() \
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({ register unsigned int __val asm("r0"); \
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asm ("mrc p15, 0, r0, c13, c0, 3" : "=r"(__val) ); \
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(volatile void*)__val; })
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# else /* !HAVE_ARM_TLS_REGISTER */
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# define __get_tls() ( *((volatile void **) 0xffff0ff0) )
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# endif
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#else
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# else /* !HAVE_ARM_TLS_REGISTER */
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/* The kernel provides the address of the TLS at a fixed
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* address of the magic page too.
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*/
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# define __get_tls() ( *((volatile void **) 0xffff0ff0) )
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# endif
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# endif /* !LIBC_STATIC */
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#else /* !ARM */
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extern void* __get_tls( void );
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#endif
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#endif /* !ARM */
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/* return the stack base and size, used by our malloc debugger */
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extern void* __get_stack_base(int *p_stack_size);
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