[thirdparty/glibc.git] / ports / sysdeps / unix / sysv / linux / aarch64 / nptl / vfork.S

/* Copyright (C) 2005-2014 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public License as
   published by the Free Software Foundation; either version 2.1 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   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, see
   <http://www.gnu.org/licenses/>.  */

#include <tcb-offsets.h>

/* Save the PID value.  */
#define SAVE_PID                                                              \
        mrs     x2, tpidr_el0;                                                \
        sub     x2, x2, #PTHREAD_SIZEOF;                                      \
        ldr     w3, [x2, #PTHREAD_PID_OFFSET];                                \
        cmp     w3, #0;                                                       \
        mov     w0, #0x80000000;                                              \
	csneg	w0, w0, w3, eq;                                               \
        str     w0, [x2, #PTHREAD_PID_OFFSET]

/* Restore the old PID value in the parent.  */
#define RESTORE_PID                                                           \
        cbz     x0, 1f;                         /* If we are the parent... */ \
        str     w3, [x2, #PTHREAD_PID_OFFSET];  /* restore the saved PID.  */ \
1:

#include "../vfork.S"
Commit	Line	Data
d4697bc9	1	/* Copyright (C) 2005-2014 Free Software Foundation, Inc.
554066b8 MS	2
	3	This file is part of the GNU C Library.
	4
	5	The GNU C Library is free software; you can redistribute it and/or
	6	modify it under the terms of the GNU Lesser General Public License as
	7	published by the Free Software Foundation; either version 2.1 of the
	8	License, or (at your option) any later version.
	9
	10	The GNU C Library is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	Lesser General Public License for more details.
	14
	15	You should have received a copy of the GNU Lesser General Public
	16	License along with the GNU C Library; if not, see
	17	<http://www.gnu.org/licenses/>. */
	18
	19	#include <tcb-offsets.h>
	20
	21	/* Save the PID value. */
	22	#define SAVE_PID \
	23	mrs x2, tpidr_el0; \
	24	sub x2, x2, #PTHREAD_SIZEOF; \
	25	ldr w3, [x2, #PTHREAD_PID_OFFSET]; \
	26	cmp w3, #0; \
	27	mov w0, #0x80000000; \
	28	csneg w0, w0, w3, eq; \
	29	str w0, [x2, #PTHREAD_PID_OFFSET]
	30
	31	/* Restore the old PID value in the parent. */
	32	#define RESTORE_PID \
	33	cbz x0, 1f; /* If we are the parent... */ \
	34	str w3, [x2, #PTHREAD_PID_OFFSET]; /* restore the saved PID. */ \
	35	1:
	36
	37	#include "../vfork.S"