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/* Set current context. OpenRISC version.
Copyright (C) 2022 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
<https://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include "ucontext_i.h"
/* int setcontext (const ucontext_t *ucp) */
.text
ENTRY(__setcontext)
l.ori r30, r3, 0
/* Restore signal mask. */
/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */
l.ori r6, r0, _NSIG8
l.ori r5, r0, 0
l.addi r4, r3, UCONTEXT_SIGMASK
l.ori r3, r0, SIG_SETMASK
l.ori r11, r0, SYS_ify (rt_sigprocmask)
/* Do the syscall. */
l.sys 1
l.nop
/* if -4096 < ret < 0 holds, it's an error */
l.sfgeui r11, 0xf001
l.bf 1f
l.nop
/* Restore argument registers, for the makecontext case. */
l.lwz r3, (UCONTEXT_MCONTEXT + 3*4)(r30)
l.lwz r4, (UCONTEXT_MCONTEXT + 4*4)(r30)
l.lwz r5, (UCONTEXT_MCONTEXT + 5*4)(r30)
l.lwz r6, (UCONTEXT_MCONTEXT + 6*4)(r30)
l.lwz r7, (UCONTEXT_MCONTEXT + 7*4)(r30)
l.lwz r8, (UCONTEXT_MCONTEXT + 8*4)(r30)
/* Restore registers stored in getcontext. */
l.lwz r1, (UCONTEXT_MCONTEXT + 1*4)(r30)
l.lwz r2, (UCONTEXT_MCONTEXT + 2*4)(r30)
l.lwz r9, (UCONTEXT_MCONTEXT + 9*4)(r30)
l.lwz r10, (UCONTEXT_MCONTEXT + 10*4)(r30)
l.lwz r11, (UCONTEXT_MCONTEXT + 11*4)(r30)
/* Restore r14-r30 even, callee saved registers. */
l.lwz r14, (UCONTEXT_MCONTEXT + 14*4)(r30)
l.lwz r16, (UCONTEXT_MCONTEXT + 16*4)(r30)
l.lwz r18, (UCONTEXT_MCONTEXT + 18*4)(r30)
l.lwz r20, (UCONTEXT_MCONTEXT + 20*4)(r30)
l.lwz r22, (UCONTEXT_MCONTEXT + 22*4)(r30)
l.lwz r24, (UCONTEXT_MCONTEXT + 24*4)(r30)
l.lwz r26, (UCONTEXT_MCONTEXT + 26*4)(r30)
l.lwz r28, (UCONTEXT_MCONTEXT + 28*4)(r30)
l.lwz r30, (UCONTEXT_MCONTEXT + 30*4)(r30)
l.jr r11
l.ori r11, r0, 0
1: l.j __syscall_error
l.ori r3, r11, 0
END (__setcontext)
weak_alias (__setcontext, setcontext)
/* We add a NOP here because when the unwinder is looking for the
enclosing function of the link register (r9) address FDE lookup will
use '$r9 - 1' finding setcontext which is wrong. This is because in
makecontext we have set r9 to the start of &__startcontext.
If this NOP did not exist the unwinder would repeatedly find
__setcontext's FDE in an infinite loop. Modifiying/deleting the below
__startcontext's FDE has no help on this. */
l.nop
ENTRY(__startcontext)
l.ori r3, r14, 0
l.sfeq r3, r0
/* If uc_link is not 0 resume there, otherwise exit. */
l.bnf __setcontext
l.nop
#ifdef SHARED
/* Obtain a pointer to .got in r16 */
l.jal 0x8
l.movhi r16, gotpchi(_GLOBAL_OFFSET_TABLE_-4)
l.ori r16, r16, gotpclo(_GLOBAL_OFFSET_TABLE_+0)
l.add r16, r16, r9
l.lwz r16, got(exit)(r16)
l.jr r16
#else
l.j exit
#endif
l.nop
END(__startcontext)
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