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67 lines
2.1 KiB
ArmAsm
67 lines
2.1 KiB
ArmAsm
/* Save current context.
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Copyright (C) 2015-2016 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 getcontext (ucontext_t *ucp)
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Returns 0 on success -1 and errno on failure.
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*/
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.text
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ENTRY(__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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/* 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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mov r2, zero
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ret
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PSEUDO_END(__getcontext)
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weak_alias(__getcontext, getcontext)
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