glibc/sysdeps/unix/sysv/linux/aarch64/makecontext.c
Steve Ellcey 44bcba80f3 aarch64: Fix tst-makecontext3 in ILP32 mode.
* sysdeps/unix/sysv/linux/aarch64/makecontext.c (__makecontext):
	Use pointer to uint64_t instead of long int for sp.
2017-08-30 09:25:51 -07:00

75 lines
2.1 KiB
C

/* Create new context.
Copyright (C) 2002-2017 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 <sysdep.h>
#include <stdarg.h>
#include <stdint.h>
#include <ucontext.h>
/* makecontext sets up a stack and the registers for the
user context. The stack looks like this:
+-----------------------+
| padding as required |
+-----------------------+
sp -> | parameter 7-n |
+-----------------------+
The registers are set up like this:
%x0 .. %x7: parameter 1 to 8
%x19 : uc_link
%sp : stack pointer.
*/
void
__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
{
extern void __startcontext (void);
uint64_t *sp;
va_list ap;
int i;
sp = (uint64_t *)
((uintptr_t) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
/* Allocate stack arguments. */
sp -= argc < 8 ? 0 : argc - 8;
/* Keep the stack aligned. */
sp = (uint64_t *) (((uintptr_t) sp) & -16L);
ucp->uc_mcontext.regs[19] = (uintptr_t) ucp->uc_link;
ucp->uc_mcontext.sp = (uintptr_t) sp;
ucp->uc_mcontext.pc = (uintptr_t) func;
ucp->uc_mcontext.regs[29] = (uintptr_t) 0;
ucp->uc_mcontext.regs[30] = (uintptr_t) &__startcontext;
va_start (ap, argc);
for (i = 0; i < argc; ++i)
if (i < 8)
ucp->uc_mcontext.regs[i] = va_arg (ap, uint64_t);
else
sp[i - 8] = va_arg (ap, uint64_t);
va_end (ap);
}
weak_alias (__makecontext, makecontext)