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96 lines
2.7 KiB
ArmAsm
96 lines
2.7 KiB
ArmAsm
/* Save and set current context.
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Copyright (C) 2022-2024 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 "ucontext-macros.h"
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/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
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LEAF (__swapcontext)
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ori a2, sp, 0 /* Save sp to a2 */
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addi.d sp, sp, -16
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st.d a1, sp, 0
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ori t0, a1, 0
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SAVE_INT_REG (ra, 1, a0)
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SAVE_INT_REG (a2, 3, a0) /* Store sp */
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SAVE_INT_REG (zero, 4, a0) /* return 0 by overwriting a0 */
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SAVE_INT_REG (x, 21, a0)
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SAVE_INT_REG (fp, 22, a0)
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SAVE_INT_REG (s0, 23, a0)
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SAVE_INT_REG (s1, 24, a0)
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SAVE_INT_REG (s2, 25, a0)
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SAVE_INT_REG (s3, 26, a0)
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SAVE_INT_REG (s4, 27, a0)
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SAVE_INT_REG (s5, 28, a0)
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SAVE_INT_REG (s6, 29, a0)
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SAVE_INT_REG (s7, 30, a0)
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SAVE_INT_REG (s8, 31, a0)
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st.d ra, a0, MCONTEXT_PC
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/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, _NSIG8) */
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li.d a3, _NSIG8
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li.d a2, UCONTEXT_SIGMASK
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add.d a2, a2, a0
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li.d a1, UCONTEXT_SIGMASK
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add.d a1, a1, t0
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li.d a0, SIG_SETMASK
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li.d a7, SYS_ify (rt_sigprocmask)
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syscall 0
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blt a0, zero, 99f
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ld.d t0, sp, 0 /* Load a1 to t0 */
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/* Note the contents of argument registers will be random
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unless makecontext() has been called. */
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RESTORE_INT_REG (ra, 1, t0)
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RESTORE_INT_REG (sp, 3, t0)
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RESTORE_INT_REG (a0, 4, t0)
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RESTORE_INT_REG (a1, 5, t0)
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RESTORE_INT_REG (a2, 6, t0)
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RESTORE_INT_REG (a3, 7, t0)
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RESTORE_INT_REG (a4, 8, t0)
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RESTORE_INT_REG (a5, 9, t0)
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RESTORE_INT_REG (a6, 10, t0)
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RESTORE_INT_REG (a7, 11, t0)
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RESTORE_INT_REG (x, 21, t0)
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RESTORE_INT_REG (fp, 22, t0)
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RESTORE_INT_REG (s0, 23, t0)
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RESTORE_INT_REG (s1, 24, t0)
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RESTORE_INT_REG (s2, 25, t0)
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RESTORE_INT_REG (s3, 26, t0)
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RESTORE_INT_REG (s4, 27, t0)
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RESTORE_INT_REG (s5, 28, t0)
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RESTORE_INT_REG (s6, 29, t0)
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RESTORE_INT_REG (s7, 30, t0)
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RESTORE_INT_REG (s8, 31, t0)
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ld.d t1, t0, MCONTEXT_PC
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jirl $r0, t1, 0
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99:
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addi.d sp, sp, 16
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b __syscall_error
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PSEUDO_END (__swapcontext)
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weak_alias (__swapcontext, swapcontext)
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