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126 lines
3.7 KiB
ArmAsm
126 lines
3.7 KiB
ArmAsm
/* Modify saved context.
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Copyright (C) 2015-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include "ucontext_i.h"
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/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
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.text
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ENTRY(__swapcontext)
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/* Same as getcontext(). */
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stw r16, (UCONTEXT_MCONTEXT + 16*4)(r4)
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stw r17, (UCONTEXT_MCONTEXT + 17*4)(r4)
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stw r18, (UCONTEXT_MCONTEXT + 18*4)(r4)
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stw r19, (UCONTEXT_MCONTEXT + 19*4)(r4)
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stw r20, (UCONTEXT_MCONTEXT + 20*4)(r4)
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stw r21, (UCONTEXT_MCONTEXT + 21*4)(r4)
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stw r22, (UCONTEXT_MCONTEXT + 22*4)(r4)
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stw ra, (UCONTEXT_MCONTEXT + 24*4)(r4)
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stw fp, (UCONTEXT_MCONTEXT + 25*4)(r4)
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stw gp, (UCONTEXT_MCONTEXT + 26*4)(r4)
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/* Store return address at place for EA. */
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stw ra, (UCONTEXT_MCONTEXT + 28*4)(r4)
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stw sp, (UCONTEXT_MCONTEXT + 29*4)(r4)
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/* Store zero for return success. */
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stw zero, (UCONTEXT_MCONTEXT + 2*4)(r4)
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/* Store value "1" at uc_flags to recognize as getcontext created. */
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movi r2, 1
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stw r2, UCONTEXT_FLAGS(r4)
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/* Store MCONTEXT_VERSION at first word of mcontext_t. */
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movi r2, MCONTEXT_VERSION
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stw r2, UCONTEXT_MCONTEXT(r4)
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/* Save ucp to non-argument syscall preserved register. */
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mov r10, r5
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/* Get signal mask. */
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/* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */
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movi r7, _NSIG8
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addi r6, r4, UCONTEXT_SIGMASK
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mov r5, zero
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movi r4, SIG_BLOCK
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movi r2, SYS_ify (rt_sigprocmask)
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trap
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bne r7, zero, SYSCALL_ERROR_LABEL
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/* Same as setcontext(). */
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ldw r5, UCONTEXT_FLAGS(r10)
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movi r6, 1
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bne r5, r6, .Lsigreturn
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/* Restore signal mask. */
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/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */
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movi r7, _NSIG8
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addi r5, r10, UCONTEXT_SIGMASK
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mov r6, zero
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movi r4, SIG_SETMASK
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movi r2, SYS_ify (rt_sigprocmask)
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trap
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bne r7, zero, SYSCALL_ERROR_LABEL
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/* Restore argument registers, for the makecontext() case. */
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ldw r4, (UCONTEXT_MCONTEXT + 4*4)(r10)
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ldw r5, (UCONTEXT_MCONTEXT + 5*4)(r10)
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ldw r6, (UCONTEXT_MCONTEXT + 6*4)(r10)
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ldw r7, (UCONTEXT_MCONTEXT + 7*4)(r10)
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ldw r16, (UCONTEXT_MCONTEXT + 16*4)(r10)
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ldw r17, (UCONTEXT_MCONTEXT + 17*4)(r10)
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ldw r18, (UCONTEXT_MCONTEXT + 18*4)(r10)
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ldw r19, (UCONTEXT_MCONTEXT + 19*4)(r10)
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ldw r20, (UCONTEXT_MCONTEXT + 20*4)(r10)
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ldw r21, (UCONTEXT_MCONTEXT + 21*4)(r10)
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ldw r22, (UCONTEXT_MCONTEXT + 22*4)(r10)
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ldw ra, (UCONTEXT_MCONTEXT + 24*4)(r10)
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ldw fp, (UCONTEXT_MCONTEXT + 25*4)(r10)
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ldw gp, (UCONTEXT_MCONTEXT + 26*4)(r10)
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/* Load address to continue execution. */
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ldw r3, (UCONTEXT_MCONTEXT + 28*4)(r10)
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ldw sp, (UCONTEXT_MCONTEXT + 29*4)(r10)
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mov r2, zero
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jmp r3
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.Lsigreturn:
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addi sp, sp, -RT_SIGFRAME_SIZE
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cfi_adjust_cfa_offset (RT_SIGFRAME_SIZE)
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addi r2, sp, RT_SIGFRAME_UCONTEXT
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movi r3, UCONTEXT_SIZE-4
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1:
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add r6, r4, r3
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ldw r5, 0(r6)
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add r7, r2, r3
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addi r3, r3, -4
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stw r5, 0(r7)
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bgt r3, zero, 1b
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movi r2, SYS_ify (rt_sigreturn)
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trap
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addi sp, sp, RT_SIGFRAME_SIZE
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cfi_adjust_cfa_offset (-RT_SIGFRAME_SIZE)
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br SYSCALL_ERROR_LABEL
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PSEUDO_END (__swapcontext)
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weak_alias (__swapcontext, swapcontext)
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