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74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
/* Create new context for ARC.
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Copyright (C) 2020-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <sys/ucontext.h>
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void
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__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
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{
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extern void __startcontext (void) attribute_hidden;
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unsigned long int sp, *r;
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va_list vl;
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int i, reg_args, stack_args;
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sp = ((unsigned long int) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size) & ~7;
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ucp->uc_mcontext.__sp = sp;
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ucp->uc_mcontext.__fp = 0;
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/* __startcontext is sort of trampoline to invoke @func
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From setcontext pov, the resume address is __startcontext,
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set it up in BLINK place holder. */
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ucp->uc_mcontext.__blink = (unsigned long int) &__startcontext;
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/* __startcontext passed 2 types of args
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- args to @func setup in canonical r0-r7
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- @func and next function in r14,r15. */
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ucp->uc_mcontext.__r14 = (unsigned long int) func;
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ucp->uc_mcontext.__r15 = (unsigned long int) ucp->uc_link;
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r = &ucp->uc_mcontext.__r0;
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va_start (vl, argc);
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reg_args = argc > 8 ? 8 : argc;
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for (i = 0; i < reg_args; i++)
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*r-- = va_arg (vl, unsigned long int);
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stack_args = argc - reg_args;
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if (__glibc_unlikely (stack_args > 0))
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{
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sp -= stack_args * sizeof (unsigned long int);
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ucp->uc_mcontext.__sp = sp;
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r = (unsigned long int *) sp;
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for (i = 0; i < stack_args; i++)
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*r++ = va_arg (vl, unsigned long int);
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}
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va_end (vl);
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}
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weak_alias (__makecontext, makecontext)
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