diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/loongarch/swapcontext.S')
-rw-r--r-- | sysdeps/unix/sysv/linux/loongarch/swapcontext.S | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/loongarch/swapcontext.S b/sysdeps/unix/sysv/linux/loongarch/swapcontext.S new file mode 100644 index 0000000000..bb22cd2f00 --- /dev/null +++ b/sysdeps/unix/sysv/linux/loongarch/swapcontext.S @@ -0,0 +1,95 @@ +/* Save and set current context. + Copyright (C) 2022 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 "ucontext-macros.h" + +/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */ + +LEAF (__swapcontext) + ori a2, sp, 0 /* Save sp to a2 */ + addi.d sp, sp, -16 + st.d a1, sp, 0 + ori t0, a1, 0 + + SAVE_INT_REG (ra, 1, a0) + SAVE_INT_REG (a2, 3, a0) /* Store sp */ + SAVE_INT_REG (zero, 4, a0) /* return 0 by overwriting a0 */ + SAVE_INT_REG (x, 21, a0) + SAVE_INT_REG (fp, 22, a0) + SAVE_INT_REG (s0, 23, a0) + SAVE_INT_REG (s1, 24, a0) + SAVE_INT_REG (s2, 25, a0) + SAVE_INT_REG (s3, 26, a0) + SAVE_INT_REG (s4, 27, a0) + SAVE_INT_REG (s5, 28, a0) + SAVE_INT_REG (s6, 29, a0) + SAVE_INT_REG (s7, 30, a0) + SAVE_INT_REG (s8, 31, a0) + + st.d ra, a0, MCONTEXT_PC + +/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, _NSIG8) */ + li.d a3, _NSIG8 + li.d a2, UCONTEXT_SIGMASK + add.d a2, a2, a0 + li.d a1, UCONTEXT_SIGMASK + add.d a1, a1, t0 + li.d a0, SIG_SETMASK + + li.d a7, SYS_ify (rt_sigprocmask) + syscall 0 + + blt a0, zero, 99f + + ld.d t0, sp, 0 /* Load a1 to t0 */ + +/* Note the contents of argument registers will be random + unless makecontext() has been called. */ + RESTORE_INT_REG (ra, 1, t0) + RESTORE_INT_REG (sp, 3, t0) + RESTORE_INT_REG (a0, 4, t0) + RESTORE_INT_REG (a1, 5, t0) + RESTORE_INT_REG (a2, 6, t0) + RESTORE_INT_REG (a3, 7, t0) + RESTORE_INT_REG (a4, 8, t0) + RESTORE_INT_REG (a5, 9, t0) + RESTORE_INT_REG (a6, 10, t0) + RESTORE_INT_REG (a7, 11, t0) + RESTORE_INT_REG (x, 21, t0) + RESTORE_INT_REG (fp, 22, t0) + RESTORE_INT_REG (s0, 23, t0) + RESTORE_INT_REG (s1, 24, t0) + RESTORE_INT_REG (s2, 25, t0) + RESTORE_INT_REG (s3, 26, t0) + RESTORE_INT_REG (s4, 27, t0) + RESTORE_INT_REG (s5, 28, t0) + RESTORE_INT_REG (s6, 29, t0) + RESTORE_INT_REG (s7, 30, t0) + RESTORE_INT_REG (s8, 31, t0) + + ld.d t1, t0, MCONTEXT_PC + jirl $r0, t1, 0 + + +99: + addi.d sp, sp, 16 + b __syscall_error + +PSEUDO_END (__swapcontext) + +weak_alias (__swapcontext, swapcontext) |