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49 lines
1.4 KiB
ArmAsm
49 lines
1.4 KiB
ArmAsm
/* Copyright (C) 2005-2020 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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/* In the EABI syscall interface, we don't need a special syscall to
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implement syscall(). It won't work reliably with 64-bit arguments
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(but that is true on many modern platforms). */
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ENTRY (syscall)
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mov ip, sp
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push {r4, r5, r6, r7}
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cfi_adjust_cfa_offset (16)
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cfi_rel_offset (r4, 0)
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cfi_rel_offset (r5, 4)
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cfi_rel_offset (r6, 8)
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cfi_rel_offset (r7, 12)
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mov r7, r0
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mov r0, r1
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mov r1, r2
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mov r2, r3
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ldmfd ip, {r3, r4, r5, r6}
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swi 0x0
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pop {r4, r5, r6, r7}
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cfi_adjust_cfa_offset (-16)
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cfi_restore (r4)
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cfi_restore (r5)
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cfi_restore (r6)
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cfi_restore (r7)
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cmn r0, #4096
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it cc
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RETINSTR(cc, lr)
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b PLTJMP(syscall_error)
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PSEUDO_END (syscall)
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