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56 lines
2.1 KiB
ArmAsm
56 lines
2.1 KiB
ArmAsm
/* Copyright (C) 2005-2017 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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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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/* GCC will emit calls to this routine under -mtp=soft. 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 high page of memory; tail call to the
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helper. */
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.hidden __aeabi_read_tp
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ENTRY (__aeabi_read_tp)
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#ifdef ARCH_HAS_HARD_TP
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mrc p15, 0, r0, c13, c0, 3
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bx lr
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#elif defined(__thumb2__)
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movw r0, #0x0fe0
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movt r0, #0xffff
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bx r0
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#else
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mov r0, #0xffff0fff
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sub pc, r0, #31
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#endif
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END (__aeabi_read_tp)
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