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96 lines
3.2 KiB
ArmAsm
96 lines
3.2 KiB
ArmAsm
/* Copyright (C) 2010-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010.
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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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In addition to the permissions in the GNU Lesser General Public
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License, the Free Software Foundation gives you unlimited
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permission to link the compiled version of this file with other
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programs, and to distribute those programs without any restriction
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coming from the use of this file. (The GNU Lesser General Public
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License restrictions do apply in other respects; for example, they
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cover modification of the file, and distribution when not linked
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into another program.)
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Note that people who make modified versions of this file are not
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obligated to grant this special exception for their modified
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versions; it is their choice whether to do so. The GNU Lesser
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General Public License gives permission to release a modified
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version without this exception; this exception also makes it
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possible to release a modified version which carries forward this
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exception.
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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 <m68k-vdso.h>
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.text
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.hidden __vdso_read_tp_stub
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ENTRY (__vdso_read_tp_stub)
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move.l #__NR_get_thread_area, %d0
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trap #0
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move.l %d0, %a0
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rts
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END (__vdso_read_tp_stub)
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# ifdef SHARED
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/* GCC will emit calls to this routine. Linux has an
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equivalent helper function (which clobbers fewer registers than
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a normal function call) in a vdso; tail call to the
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helper. */
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# if IS_IN (rtld)
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/* rtld gets a hidden copy of __m68k_read_tp. */
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.hidden __m68k_read_tp
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# endif
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ENTRY (__m68k_read_tp)
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LOAD_GOT (%a0)
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move.l M68K_VDSO_SYMBOL (__vdso_read_tp)@GOT(%a0), %a0
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move.l (%a0), %a0
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jmp (%a0)
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END (__m68k_read_tp)
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/* The following two stubs are for macros in atomic.h, they can't
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clobber anything. */
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.hidden __vdso_atomic_cmpxchg_32_stub
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ENTRY (__vdso_atomic_cmpxchg_32_stub)
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move.l %d2, -(%sp)
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (%d2, 0)
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move.l %d0, %d2
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move.l #SYS_ify (atomic_cmpxchg_32), %d0
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trap #0
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move.l (%sp)+, %d2
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cfi_adjust_cfa_offset (-4)
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cfi_restore (%d2)
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rts
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END (__vdso_atomic_cmpxchg_32_stub)
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.hidden __vdso_atomic_barrier_stub
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ENTRY (__vdso_atomic_barrier_stub)
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move.l %d0, -(%sp)
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cfi_adjust_cfa_offset (4)
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move.l #SYS_ify (atomic_barrier), %d0
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trap #0
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move.l (%sp)+, %d0
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cfi_adjust_cfa_offset (-4)
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rts
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END (__vdso_atomic_barrier_stub)
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# else /* !SHARED */
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/* If the vDSO is not available, use a syscall to get TP. */
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strong_alias (__vdso_read_tp_stub, __m68k_read_tp)
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# endif /* SHARED */
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