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/* Create new context for ARC.
Copyright (C) 2020-2021 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
<https://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <stdarg.h>
#include <stdint.h>
#include <sys/ucontext.h>
void
__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
{
extern void __startcontext (void) attribute_hidden;
unsigned long int sp, *r;
va_list vl;
int i, reg_args, stack_args;
sp = ((unsigned long int) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size) & ~7;
ucp->uc_mcontext.__sp = sp;
ucp->uc_mcontext.__fp = 0;
/* __startcontext is sort of trampoline to invoke @func
From setcontext pov, the resume address is __startcontext,
set it up in BLINK place holder. */
ucp->uc_mcontext.__blink = (unsigned long int) &__startcontext;
/* __startcontext passed 2 types of args
- args to @func setup in canonical r0-r7
- @func and next function in r14,r15. */
ucp->uc_mcontext.__r14 = (unsigned long int) func;
ucp->uc_mcontext.__r15 = (unsigned long int) ucp->uc_link;
r = &ucp->uc_mcontext.__r0;
va_start (vl, argc);
reg_args = argc > 8 ? 8 : argc;
for (i = 0; i < reg_args; i++)
*r-- = va_arg (vl, unsigned long int);
stack_args = argc - reg_args;
if (__glibc_unlikely (stack_args > 0))
{
sp -= stack_args * sizeof (unsigned long int);
ucp->uc_mcontext.__sp = sp;
r = (unsigned long int *) sp;
for (i = 0; i < stack_args; i++)
*r++ = va_arg (vl, unsigned long int);
}
va_end (vl);
}
weak_alias (__makecontext, makecontext)
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