-/* Copyright (C) 1996, 1997,98,99,2000,02 Free Software Foundation, Inc.
+/* Copyright (C) 1996-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Richard Henderson (rth@tamu.edu)
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
/* clone() is even more special than fork() as it mucks with stacks
and invokes a function in the right context after its all over. */
#define _ERRNO_H 1
#include <bits/errno.h>
#include <asm-syntax.h>
-#include <bp-sym.h>
-#include <bp-asm.h>
/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
- pid_t *tid, struct user_desc *tls); */
+ pid_t *ptid, struct user_desc *tls, pid_t *ctid); */
-#define PARMS LINKAGE /* no space for saved regs */
+#define PARMS 4 /* no space for saved regs */
#define FUNC PARMS
#define STACK FUNC+4
-#define FLAGS STACK+PTR_SIZE
+#define FLAGS STACK+4
#define ARG FLAGS+4
-#define TID ARG+PTR_SIZE
-#define TLS TID+PTR_SIZE
+#define PTID ARG+4
+#define TLS PTID+4
+#define CTID TLS+4
#define __NR_clone 120
#define SYS_clone 120
.text
-ENTRY (BP_SYM (__clone))
+ENTRY (__clone)
/* Sanity check arguments. */
movl $-EINVAL,%eax
movl FUNC(%esp),%ecx /* no NULL function pointers */
-#ifdef PIC
- jecxz SYSCALL_ERROR_LABEL
-#else
testl %ecx,%ecx
jz SYSCALL_ERROR_LABEL
-#endif
movl STACK(%esp),%ecx /* no NULL stack pointers */
-#ifdef PIC
- jecxz SYSCALL_ERROR_LABEL
-#else
testl %ecx,%ecx
jz SYSCALL_ERROR_LABEL
-#endif
- /* Insert the argument onto the new stack. */
- subl $12,%ecx
+ /* Insert the argument onto the new stack. Make sure the new
+ thread is started with an alignment of (mod 16). */
+ andl $0xfffffff0, %ecx
+ subl $28,%ecx
movl ARG(%esp),%eax /* no negative argument counts */
- movl %eax,8(%ecx)
+ movl %eax,12(%ecx)
/* Save the function pointer as the zeroth argument.
It will be popped off in the child in the ebx frobbing below. */
movl FUNC(%esp),%eax
- movl %eax,4(%ecx)
+ movl %eax,8(%ecx)
+ /* Don't leak any information. */
+ movl $0,4(%ecx)
/* Do the system call */
pushl %ebx
+ cfi_adjust_cfa_offset (4)
pushl %esi
- movl TLS+8(%esp),%esi
- movl TID+8(%esp),%edx
- movl FLAGS+8(%esp),%ebx
+ cfi_adjust_cfa_offset (4)
+ pushl %edi
+ cfi_adjust_cfa_offset (4)
+
+ movl TLS+12(%esp),%esi
+ cfi_rel_offset (esi, 4)
+ movl PTID+12(%esp),%edx
+ movl FLAGS+12(%esp),%ebx
+ cfi_rel_offset (ebx, 8)
+ movl CTID+12(%esp),%edi
+ cfi_rel_offset (edi, 0)
movl $SYS_ify(clone),%eax
+
+ /* Remember the flag value. */
+ movl %ebx, (%ecx)
+
+ /* End FDE now, because in the child the unwind info will be
+ wrong. */
+ cfi_endproc
+
int $0x80
+ popl %edi
popl %esi
popl %ebx
jl SYSCALL_ERROR_LABEL
jz L(thread_start)
-L(pseudo_end):
ret
L(thread_start):
- subl %ebp,%ebp /* terminate the stack frame */
+ cfi_startproc;
+ /* Clearing frame pointer is insufficient, use CFI. */
+ cfi_undefined (eip);
+ /* Note: %esi is zero. */
+ movl %esi,%ebp /* terminate the stack frame */
call *%ebx
#ifdef PIC
call L(here)
#endif
movl %eax, %ebx
movl $SYS_ify(exit), %eax
- int $0x80
+ ENTER_KERNEL
-PSEUDO_END (BP_SYM (__clone))
+PSEUDO_END (__clone)
-weak_alias (BP_SYM (__clone), BP_SYM (clone))
+libc_hidden_def (__clone)
+weak_alias (__clone, clone)