| /* Set current context. |
| Copyright (C) 2009-2018 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 |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include "ucontext-macros.h" |
| |
| /* int __setcontext (const ucontext_t *ucp) |
| |
| Restores the machine context in UCP and thereby resumes execution |
| in that context. |
| |
| This implementation is intended to be used for *synchronous* context |
| switches only. Therefore, it does not have to restore anything |
| other than the PRESERVED state. */ |
| |
| .text |
| LEAF (__setcontext) |
| |
| mv t0, a0 /* Save ucp into t0. */ |
| |
| /* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */ |
| li a3, _NSIG8 |
| mv a2, zero |
| add a1, a0, UCONTEXT_SIGMASK |
| li a0, SIG_SETMASK |
| |
| li a7, SYS_ify (rt_sigprocmask) |
| scall |
| |
| bltz a0, 99f |
| |
| cfi_def_cfa (t0, 0) |
| |
| #ifndef __riscv_float_abi_soft |
| lw t1, MCONTEXT_FSR(t0) |
| |
| RESTORE_FP_REG_CFI (fs0, 8, t0) |
| RESTORE_FP_REG_CFI (fs1, 9, t0) |
| RESTORE_FP_REG_CFI (fs2, 18, t0) |
| RESTORE_FP_REG_CFI (fs3, 19, t0) |
| RESTORE_FP_REG_CFI (fs4, 20, t0) |
| RESTORE_FP_REG_CFI (fs5, 21, t0) |
| RESTORE_FP_REG_CFI (fs6, 22, t0) |
| RESTORE_FP_REG_CFI (fs7, 23, t0) |
| RESTORE_FP_REG_CFI (fs8, 24, t0) |
| RESTORE_FP_REG_CFI (fs9, 25, t0) |
| RESTORE_FP_REG_CFI (fs10, 26, t0) |
| RESTORE_FP_REG_CFI (fs11, 27, t0) |
| |
| fssr t1 |
| #endif /* __riscv_float_abi_soft */ |
| |
| /* Note the contents of argument registers will be random |
| unless makecontext() has been called. */ |
| RESTORE_INT_REG (t1, 0, t0) |
| RESTORE_INT_REG_CFI (ra, 1, t0) |
| RESTORE_INT_REG (sp, 2, t0) |
| RESTORE_INT_REG_CFI (s0, 8, t0) |
| RESTORE_INT_REG_CFI (s1, 9, t0) |
| RESTORE_INT_REG (a0, 10, t0) |
| RESTORE_INT_REG (a1, 11, t0) |
| RESTORE_INT_REG (a2, 12, t0) |
| RESTORE_INT_REG (a3, 13, t0) |
| RESTORE_INT_REG (a4, 14, t0) |
| RESTORE_INT_REG (a5, 15, t0) |
| RESTORE_INT_REG (a6, 16, t0) |
| RESTORE_INT_REG (a7, 17, t0) |
| RESTORE_INT_REG_CFI (s2, 18, t0) |
| RESTORE_INT_REG_CFI (s3, 19, t0) |
| RESTORE_INT_REG_CFI (s4, 20, t0) |
| RESTORE_INT_REG_CFI (s5, 21, t0) |
| RESTORE_INT_REG_CFI (s6, 22, t0) |
| RESTORE_INT_REG_CFI (s7, 23, t0) |
| RESTORE_INT_REG_CFI (s8, 24, t0) |
| RESTORE_INT_REG_CFI (s9, 25, t0) |
| RESTORE_INT_REG_CFI (s10, 26, t0) |
| RESTORE_INT_REG_CFI (s11, 27, t0) |
| |
| jr t1 |
| |
| 99: j __syscall_error |
| |
| PSEUDO_END (__setcontext) |
| weak_alias (__setcontext, setcontext) |
| |
| LEAF (__start_context) |
| |
| /* Terminate call stack by noting ra == 0. Happily, s0 == 0 here. */ |
| cfi_register (ra, s0) |
| |
| /* Call the function passed to makecontext. */ |
| jalr s1 |
| |
| /* Invoke subsequent context if present, else exit(0). */ |
| mv a0, s2 |
| beqz s2, 1f |
| jal __setcontext |
| 1: j exit |
| |
| PSEUDO_END (__start_context) |
