| /* Set current context. |
| Copyright (C) 2015-2018 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 <sysdep.h> |
| #include "ucontext_i.h" |
| |
| /* int setcontext (const ucontext_t *ucp) */ |
| .text |
| ENTRY(__setcontext) |
| ldw r5, UCONTEXT_FLAGS(r4) |
| movi r6, 1 |
| bne r5, r6, .Lsigreturn |
| |
| mov r10, r4 |
| |
| /* Restore signal mask. */ |
| /* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */ |
| movi r7, _NSIG8 |
| addi r5, r4, UCONTEXT_SIGMASK |
| mov r6, zero |
| movi r4, SIG_SETMASK |
| movi r2, SYS_ify (rt_sigprocmask) |
| trap |
| bne r7, zero, SYSCALL_ERROR_LABEL |
| |
| /* Restore argument registers, for the makecontext() case. */ |
| ldw r4, (UCONTEXT_MCONTEXT + 4*4)(r10) |
| ldw r5, (UCONTEXT_MCONTEXT + 5*4)(r10) |
| ldw r6, (UCONTEXT_MCONTEXT + 6*4)(r10) |
| ldw r7, (UCONTEXT_MCONTEXT + 7*4)(r10) |
| |
| ldw r16, (UCONTEXT_MCONTEXT + 16*4)(r10) |
| ldw r17, (UCONTEXT_MCONTEXT + 17*4)(r10) |
| ldw r18, (UCONTEXT_MCONTEXT + 18*4)(r10) |
| ldw r19, (UCONTEXT_MCONTEXT + 19*4)(r10) |
| ldw r20, (UCONTEXT_MCONTEXT + 20*4)(r10) |
| ldw r21, (UCONTEXT_MCONTEXT + 21*4)(r10) |
| ldw r22, (UCONTEXT_MCONTEXT + 22*4)(r10) |
| ldw ra, (UCONTEXT_MCONTEXT + 24*4)(r10) |
| ldw fp, (UCONTEXT_MCONTEXT + 25*4)(r10) |
| ldw gp, (UCONTEXT_MCONTEXT + 26*4)(r10) |
| /* Load address to continue execution. */ |
| ldw r3, (UCONTEXT_MCONTEXT + 28*4)(r10) |
| ldw sp, (UCONTEXT_MCONTEXT + 29*4)(r10) |
| |
| mov r2, zero |
| jmp r3 |
| |
| .Lsigreturn: |
| addi sp, sp, -RT_SIGFRAME_SIZE |
| cfi_adjust_cfa_offset (RT_SIGFRAME_SIZE) |
| |
| addi r2, sp, RT_SIGFRAME_UCONTEXT |
| movi r3, UCONTEXT_SIZE-4 |
| 1: |
| add r6, r4, r3 |
| ldw r5, 0(r6) |
| add r7, r2, r3 |
| addi r3, r3, -4 |
| stw r5, 0(r7) |
| bgt r3, zero, 1b |
| |
| movi r2, SYS_ify (rt_sigreturn) |
| trap |
| |
| addi sp, sp, RT_SIGFRAME_SIZE |
| cfi_adjust_cfa_offset (-RT_SIGFRAME_SIZE) |
| br SYSCALL_ERROR_LABEL |
| |
| PSEUDO_END (__setcontext) |
| weak_alias (__setcontext, setcontext) |
| |
| /* We add an NOP here to separate between __setcontext/__startcontext. |
| The wanted behavior that happens is: when unwinding from a function |
| called inside a makecontext() context, FDE lookup will use |
| '&__startcontext - 1', then returns NULL for no FDE found, |
| and immediately ends the unwind, in a normal fashion. |
| |
| If this NOP word does not exist, FDE lookup just repeatedly finds |
| __setcontext's FDE in an infinite loop, due to the convention of |
| using 'address - 1' for FDE lookup. Modifiying/deleting the below |
| __startcontext's FDE has no help on this. */ |
| nop |
| |
| ENTRY(__startcontext) |
| mov r4, r16 |
| bne r4, zero, __setcontext |
| |
| /* If uc_link == zero, call exit. */ |
| #ifdef PIC |
| nextpc r22 |
| 1: movhi r8, %hiadj(_gp_got - 1b) |
| addi r8, r8, %lo(_gp_got - 1b) |
| add r22, r22, r8 |
| ldw r8, %call(HIDDEN_JUMPTARGET(exit))(r22) |
| jmp r8 |
| #else |
| jmpi exit |
| #endif |
| END(__startcontext) |
