diff options
Diffstat (limited to 'ports/sysdeps/unix/sysv/linux/m68k/m68k-helpers.S')
| -rw-r--r-- | ports/sysdeps/unix/sysv/linux/m68k/m68k-helpers.S | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/m68k/m68k-helpers.S b/ports/sysdeps/unix/sysv/linux/m68k/m68k-helpers.S new file mode 100644 index 0000000000..3b8ec6e09a --- /dev/null +++ b/ports/sysdeps/unix/sysv/linux/m68k/m68k-helpers.S @@ -0,0 +1,95 @@ +/* Copyright (C) 2010, 2012 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 */ |