diff options
Diffstat (limited to 'libc/sysdeps/linux/kvx/swapcontext.S')
| -rw-r--r-- | libc/sysdeps/linux/kvx/swapcontext.S | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/kvx/swapcontext.S b/libc/sysdeps/linux/kvx/swapcontext.S new file mode 100644 index 000000000..1abb6a8a8 --- /dev/null +++ b/libc/sysdeps/linux/kvx/swapcontext.S @@ -0,0 +1,63 @@ +/* + * 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) |