diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/nios2/setcontext.S')
| -rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/nios2/setcontext.S | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/nios2/setcontext.S b/REORG.TODO/sysdeps/unix/sysv/linux/nios2/setcontext.S new file mode 100644 index 0000000000..bb6122b5b2 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/nios2/setcontext.S @@ -0,0 +1,115 @@ +/* Set current context. + Copyright (C) 2015-2017 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) |