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116 lines
3.3 KiB
ArmAsm
116 lines
3.3 KiB
ArmAsm
/* Set current context.
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Copyright (C) 2009-2024 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 __setcontext (const ucontext_t *ucp)
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Restores the machine context in UCP and thereby resumes execution
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in that context.
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This implementation is intended to be used for *synchronous* context
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switches only. Therefore, it does not have to restore anything
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other than the PRESERVED state. */
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.text
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LEAF (__setcontext)
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mv t0, a0 /* Save ucp into t0. */
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/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */
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li a3, _NSIG8
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mv a2, zero
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add a1, a0, UCONTEXT_SIGMASK
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li a0, SIG_SETMASK
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li a7, SYS_ify (rt_sigprocmask)
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scall
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bltz a0, 99f
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cfi_def_cfa (t0, 0)
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#ifndef __riscv_float_abi_soft
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lw t1, MCONTEXT_FSR(t0)
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RESTORE_FP_REG_CFI (fs0, 8, t0)
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RESTORE_FP_REG_CFI (fs1, 9, t0)
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RESTORE_FP_REG_CFI (fs2, 18, t0)
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RESTORE_FP_REG_CFI (fs3, 19, t0)
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RESTORE_FP_REG_CFI (fs4, 20, t0)
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RESTORE_FP_REG_CFI (fs5, 21, t0)
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RESTORE_FP_REG_CFI (fs6, 22, t0)
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RESTORE_FP_REG_CFI (fs7, 23, t0)
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RESTORE_FP_REG_CFI (fs8, 24, t0)
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RESTORE_FP_REG_CFI (fs9, 25, t0)
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RESTORE_FP_REG_CFI (fs10, 26, t0)
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RESTORE_FP_REG_CFI (fs11, 27, t0)
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fssr t1
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#endif /* __riscv_float_abi_soft */
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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 (t1, 0, t0)
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RESTORE_INT_REG_CFI (ra, 1, t0)
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RESTORE_INT_REG (sp, 2, t0)
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RESTORE_INT_REG_CFI (s0, 8, t0)
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RESTORE_INT_REG_CFI (s1, 9, t0)
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RESTORE_INT_REG (a0, 10, t0)
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RESTORE_INT_REG (a1, 11, t0)
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RESTORE_INT_REG (a2, 12, t0)
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RESTORE_INT_REG (a3, 13, t0)
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RESTORE_INT_REG (a4, 14, t0)
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RESTORE_INT_REG (a5, 15, t0)
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RESTORE_INT_REG (a6, 16, t0)
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RESTORE_INT_REG (a7, 17, t0)
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RESTORE_INT_REG_CFI (s2, 18, t0)
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RESTORE_INT_REG_CFI (s3, 19, t0)
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RESTORE_INT_REG_CFI (s4, 20, t0)
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RESTORE_INT_REG_CFI (s5, 21, t0)
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RESTORE_INT_REG_CFI (s6, 22, t0)
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RESTORE_INT_REG_CFI (s7, 23, t0)
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RESTORE_INT_REG_CFI (s8, 24, t0)
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RESTORE_INT_REG_CFI (s9, 25, t0)
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RESTORE_INT_REG_CFI (s10, 26, t0)
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RESTORE_INT_REG_CFI (s11, 27, t0)
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jr t1
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99: tail __syscall_error
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END (__setcontext)
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libc_hidden_def (__setcontext)
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weak_alias (__setcontext, setcontext)
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LEAF (__start_context)
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/* Terminate call stack by noting ra == 0. Happily, s0 == 0 here. */
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cfi_register (ra, s0)
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/* Call the function passed to makecontext. */
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jalr s1
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/* Invoke subsequent context if present, else exit(0). */
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mv a0, s2
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beqz s2, 1f
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jal HIDDEN_JUMPTARGET (__setcontext)
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1: j HIDDEN_JUMPTARGET (exit)
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END (__start_context)
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