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enable clone system call for x86

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Add __bionic_clone function for x86, which will be
used for clone system call.

Change-Id: I889dc9bf4b7ebb4358476e17e6f3233e26491f4d
Signed-off-by: Jin Wei <wei.a.jin@intel.com>
Signed-off-by: Xiaokang Qin <xiaokang.qin@intel.com>
Signed-off-by: Beare, Bruce J <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 51414
This commit is contained in:
Jin Wei 2012-08-08 15:15:16 +08:00 committed by Elliott Hughes
parent e1cd69a708
commit 22d366cc09
3 changed files with 58 additions and 9 deletions
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3
libc/Android.mk
View File

@ -261,6 +261,7 @@ libc_common_src_files := \
tzcode/strftime.c \ tzcode/strftime.c \
tzcode/strptime.c \ tzcode/strptime.c \
bionic/__set_errno.c \ bionic/__set_errno.c \
bionic/bionic_clone.c \
bionic/cpuacct.c \ bionic/cpuacct.c \
bionic/arc4random.c \ bionic/arc4random.c \
bionic/basename.c \ bionic/basename.c \
@ -361,7 +362,6 @@ libc_static_common_src_files := \
# ========================================================= # =========================================================
ifeq ($(TARGET_ARCH),arm) ifeq ($(TARGET_ARCH),arm)
libc_common_src_files += \ libc_common_src_files += \
bionic/bionic_clone.c \
arch-arm/bionic/__get_pc.S \ arch-arm/bionic/__get_pc.S \
arch-arm/bionic/__get_sp.S \ arch-arm/bionic/__get_sp.S \
arch-arm/bionic/_exit_with_stack_teardown.S \ arch-arm/bionic/_exit_with_stack_teardown.S \
@ -451,7 +451,6 @@ endif # x86
ifeq ($(TARGET_ARCH),mips) ifeq ($(TARGET_ARCH),mips)
libc_common_src_files += \ libc_common_src_files += \
bionic/bionic_clone.c \
arch-mips/bionic/__get_sp.S \ arch-mips/bionic/__get_sp.S \
arch-mips/bionic/__get_tls.c \ arch-mips/bionic/__get_tls.c \
arch-mips/bionic/__set_tls.c \ arch-mips/bionic/__set_tls.c \

61
libc/arch-x86/bionic/clone.S
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@ -33,7 +33,7 @@ __pthread_clone:
test %eax, %eax test %eax, %eax
jns 1f jns 1f
# an error occured, set errno and return -1 # an error occurred, set errno and return -1
negl %eax negl %eax
call __set_errno call __set_errno
orl $-1, %eax orl $-1, %eax
@ -53,7 +53,60 @@ __pthread_clone:
popl %ebx popl %ebx
ret ret
/* XXX: TODO: Add __bionic_clone here
* See bionic/bionic_clone.c and arch-arm/bionic/clone.S /*
* for more details... * int __bionic_clone(unsigned long clone_flags,
* void* newsp,
* int *parent_tidptr,
* void *new_tls,
* int *child_tidptr,
* int (*fn)(void *),
* void *arg);
*/ */
.text
.globl __bionic_clone
.type __bionic_clone, @function
.align 4
__bionic_clone:
pushl %ebx
pushl %esi
pushl %edi
# insert arguments onto the child stack
movl 20(%esp), %ecx
andl $~15, %ecx
movl 36(%esp), %eax
movl %eax, -16(%ecx)
movl 40(%esp), %eax
movl %eax, -12(%ecx)
subl $16, %ecx
movl 16(%esp), %ebx
movl 24(%esp), %edx
movl 32(%esp), %esi
movl 28(%esp), %edi
movl $__NR_clone, %eax
int $0x80
test %eax, %eax
jns 1f
# an error occurred, set errno and return -1
negl %eax
call __set_errno
orl $-1, %eax
jmp 2f
1:
jnz 2f
# we're in the child now, call __bionic_clone_entry
# with the appropriate arguments on the child stack
# we already placed most of them
call __bionic_clone_entry
hlt
2:
popl %edi
popl %esi
popl %ebx
ret

3
libc/bionic/bionic_clone.c
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@ -31,9 +31,6 @@
#include <stdarg.h> #include <stdarg.h>
#include <stdio.h> #include <stdio.h>
/* WARNING: AT THE MOMENT, THIS IS ONLY SUPPORTED ON ARM
*/
extern int __bionic_clone(unsigned long clone_flags, extern int __bionic_clone(unsigned long clone_flags,
void* newsp, void* newsp,
int *parent_tidptr, int *parent_tidptr,