| /* Copyright (C) 2010-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| In addition to the permissions in the GNU Lesser General Public |
| License, the Free Software Foundation gives you unlimited |
| permission to link the compiled version of this file with other |
| programs, and to distribute those programs without any restriction |
| coming from the use of this file. (The GNU Lesser General Public |
| License restrictions do apply in other respects; for example, they |
| cover modification of the file, and distribution when not linked |
| into another program.) |
| |
| Note that people who make modified versions of this file are not |
| obligated to grant this special exception for their modified |
| versions; it is their choice whether to do so. The GNU Lesser |
| General Public License gives permission to release a modified |
| version without this exception; this exception also makes it |
| possible to release a modified version which carries forward this |
| exception. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sysdep.h> |
| #include <bits/m68k-vdso.h> |
| |
| .text |
| |
| .hidden __vdso_read_tp_stub |
| ENTRY (__vdso_read_tp_stub) |
| move.l #__NR_get_thread_area, %d0 |
| trap #0 |
| move.l %d0, %a0 |
| rts |
| END (__vdso_read_tp_stub) |
| |
| # ifdef SHARED |
| /* GCC will emit calls to this routine. Linux has an |
| equivalent helper function (which clobbers fewer registers than |
| a normal function call) in a vdso; tail call to the |
| helper. */ |
| # ifdef IS_IN_rtld |
| /* rtld gets a hidden copy of __m68k_read_tp. */ |
| .hidden __m68k_read_tp |
| # endif |
| ENTRY (__m68k_read_tp) |
| LOAD_GOT (%a0) |
| move.l M68K_VDSO_SYMBOL (__vdso_read_tp)@GOT(%a0), %a0 |
| move.l (%a0), %a0 |
| jmp (%a0) |
| END (__m68k_read_tp) |
| |
| /* The following two stubs are for macros in atomic.h, they can't |
| clobber anything. */ |
| |
| .hidden __vdso_atomic_cmpxchg_32_stub |
| ENTRY (__vdso_atomic_cmpxchg_32_stub) |
| move.l %d2, -(%sp) |
| cfi_adjust_cfa_offset (4) |
| cfi_rel_offset (%d2, 0) |
| move.l %d0, %d2 |
| move.l #SYS_ify (atomic_cmpxchg_32), %d0 |
| trap #0 |
| move.l (%sp)+, %d2 |
| cfi_adjust_cfa_offset (-4) |
| cfi_restore (%d2) |
| rts |
| END (__vdso_atomic_cmpxchg_32_stub) |
| |
| .hidden __vdso_atomic_barrier_stub |
| ENTRY (__vdso_atomic_barrier_stub) |
| move.l %d0, -(%sp) |
| cfi_adjust_cfa_offset (4) |
| move.l #SYS_ify (atomic_barrier), %d0 |
| trap #0 |
| move.l (%sp)+, %d0 |
| cfi_adjust_cfa_offset (-4) |
| rts |
| END (__vdso_atomic_barrier_stub) |
| # else /* !SHARED */ |
| /* If the vDSO is not available, use a syscall to get TP. */ |
| strong_alias (__vdso_read_tp_stub, __m68k_read_tp) |
| # endif /* SHARED */ |
