mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
/* Create new context for ARC.
|
|
Copyright (C) 2020-2025 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)
|