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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive for
* more details.
*
* Copyright (C) 2025 Kalray Inc.
* Author(s): Julian Vetter <jvetter@kalrayinc.com>
*/
#include <sysdep.h>
#include "ucontext_i.h"
.text
/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
ENTRY(swapcontext)
/* Make space on the stack to save all caller saved registers */
get $r16 = $ra
addd $r12 = $r12, -32
;;
/* Save $ra on the stack */
sd (24)[$r12] = $r16
;;
/* Save the arguments of swapcontext on the stack */
sq (8)[$r12] = $r0r1
;;
call __getcontext
;;
/* Save the return value of __getcontext in $r17 */
copyd $r17 = $r0
/* Restore $ra */
ld $r16 = (24)[$r12]
;;
/* Restore arguments */
lq $r0r1 = (8)[$r12]
/* Readjust the stack pointer */
addd $r12 = $r12, 32
/* Also restore $ra */
set $ra = $r16
;;
/* Exit if getcontext() failed */
cb.deqz $r17 ? 1f
;;
/* Set the return value set by __syscall_error in __getcontext */
copyd $r0 = $r17
ret
;;
1:
/* Store the $sp and $ra in the context to be saved */
sd (MCONTEXT_Q12)[$r0] = $r12
;;
sd (MCONTEXT_LC_LE_LS_RA + 24)[$r0] = $r16
copyd $r0 = $r1
goto __setcontext
;;
END(swapcontext)
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