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49 lines
1.5 KiB
ArmAsm
49 lines
1.5 KiB
ArmAsm
/* Copyright (C) 2010-2012 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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/* Out-of-line syscall stub. We expect the system call number in ip
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and return the raw result in r0. No registers are clobbered.
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We could avoid using the stack for this, but the goal is accurate
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unwind information - and while there is a reserved prefix in the
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ARM unwind tables for register to register moves, the actual opcodes
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are not defined. */
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#if defined(__thumb__)
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.thumb
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.syntax unified
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.hidden __libc_do_syscall
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#undef CALL_MCOUNT
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#define CALL_MCOUNT
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ENTRY (__libc_do_syscall)
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.fnstart
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push {r7, lr}
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.save {r7, lr}
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cfi_adjust_cfa_offset (8)
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cfi_rel_offset (r7, 0)
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cfi_rel_offset (lr, 4)
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mov r7, ip
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swi 0x0
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pop {r7, pc}
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.fnend
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END (__libc_do_syscall)
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#endif /* __thumb__ */
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