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64 lines
1.6 KiB
ArmAsm
64 lines
1.6 KiB
ArmAsm
/* Copyright (C) 2012-2020 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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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include "ucontext_i.h"
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.syntax unified
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.text
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/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
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ENTRY(swapcontext)
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/* Have getcontext() do most of the work then fix up
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LR afterwards. Save R3 to keep the stack aligned. */
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push {r0,r1,r3,r14}
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cfi_adjust_cfa_offset (16)
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cfi_rel_offset (r0,0)
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cfi_rel_offset (r1,4)
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cfi_rel_offset (r3,8)
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cfi_rel_offset (r14,12)
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bl __getcontext
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mov r4, r0
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pop {r0,r1,r3,r14}
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cfi_adjust_cfa_offset (-16)
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cfi_restore (r0)
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cfi_restore (r1)
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cfi_restore (r3)
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cfi_restore (r14)
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/* Exit if getcontext() failed. */
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cmp r4, #0
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itt ne
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movne r0, r4
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RETINSTR(ne, r14)
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/* Fix up LR and the PC. */
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str r13,[r0, #MCONTEXT_ARM_SP]
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str r14,[r0, #MCONTEXT_ARM_LR]
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str r14,[r0, #MCONTEXT_ARM_PC]
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/* And swap using swapcontext(). */
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mov r0, r1
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b __setcontext
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END(swapcontext)
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