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/* Swap two contexts. OpenRISC version.
Copyright (C) 2022-2023 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 swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
.text
ENTRY(__swapcontext)
/* Same as getcontext. */
/* Store r1, the stack pointer. */
l.sw (UCONTEXT_MCONTEXT + 1*4)(r3), r1
/* Store r2, the frame pointer. */
l.sw (UCONTEXT_MCONTEXT + 2*4)(r3), r2
/* Store r9, the link register. */
l.sw (UCONTEXT_MCONTEXT + 9*4)(r3), r9
/* Store r9 to reg[11] too, as we need two links for makecontext. */
l.sw (UCONTEXT_MCONTEXT + 11*4)(r3), r9
/* Store r10, the TLS register. */
l.sw (UCONTEXT_MCONTEXT + 10*4)(r3), r10
/* Store r14-r30 even, callee saved registers. */
l.sw (UCONTEXT_MCONTEXT + 14*4)(r3), r14
l.sw (UCONTEXT_MCONTEXT + 16*4)(r3), r16
l.sw (UCONTEXT_MCONTEXT + 18*4)(r3), r18
l.sw (UCONTEXT_MCONTEXT + 20*4)(r3), r20
l.sw (UCONTEXT_MCONTEXT + 22*4)(r3), r22
l.sw (UCONTEXT_MCONTEXT + 24*4)(r3), r24
l.sw (UCONTEXT_MCONTEXT + 26*4)(r3), r26
l.sw (UCONTEXT_MCONTEXT + 28*4)(r3), r28
l.sw (UCONTEXT_MCONTEXT + 30*4)(r3), r30
/* Store ucp to non-argument syscall preserved register. */
l.ori r30, r4, 0
/* Get signal mask. */
/* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */
l.ori r6, r0, _NSIG8
l.addi r5, r3, UCONTEXT_SIGMASK
l.ori r4, r0, 0
l.ori r3, r0, SIG_BLOCK
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
/* Same as setcontext. */
/* 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, r30, 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)
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 (__swapcontext)
weak_alias (__swapcontext, swapcontext)
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