diff options
author | Mike Frysinger <vapier@gentoo.org> | 2008-01-05 10:05:27 +0000 |
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committer | Mike Frysinger <vapier@gentoo.org> | 2008-01-05 10:05:27 +0000 |
commit | 124ec188720b6bdea85ade49e7ea195161b12fce (patch) | |
tree | 2bce39bc1e51bd587e010a61419b47d122be3165 /ldso/ldso/xtensa/resolve.S | |
parent | 9c95d5d28d8d40f7b826c9399f5ce781bbc61567 (diff) |
Chris Zankel writes:
The following patches add support for the Xtensa processor architecture
to uClibc. They are based on a recent SVN checkout (12/05/2007).
The first patch (attached to this post) adds Xtensa support to various
shared configuration and make files. The following patches then include
the Xtensa specific files and directories.
I welcome any feedback and would appreciate it if you could include the
patches into the mainline tree. I am certainly committed to maintain the port.
Bob Wilson was kind enough to review the patches.
Some notes about the architecture: Xtensa is a configurable and
extensible processor architecture developed by Tensilica. For more
information, please visit: www.linux-xtensa.org.
Diffstat (limited to 'ldso/ldso/xtensa/resolve.S')
-rw-r--r-- | ldso/ldso/xtensa/resolve.S | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/ldso/ldso/xtensa/resolve.S b/ldso/ldso/xtensa/resolve.S new file mode 100644 index 000000000..fb298391c --- /dev/null +++ b/ldso/ldso/xtensa/resolve.S @@ -0,0 +1,61 @@ +/* Xtensa dynamic resolver. + Parts copied from glibc/sysdeps/xtensa/dl-trampoline.S + Copyright (C) 2007 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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. + + 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, write to the Free + Software Foundation, Inc., 51 Franklin Street - Fifth Floor, + Boston, MA 02110-1301, USA. */ + +#define MIN_FRAME_SIZE 32 + +#ifdef __XTENSA_EB__ +#define XTENSA_IMM12_FLD_OFFSET 8 +#else /* __XTENSA_EL__ */ +#define XTENSA_IMM12_FLD_OFFSET 12 +#endif /* __XTENSA_EL__ */ + + .text + .align 4 + .global _dl_linux_resolve + .type _dl_linux_resolve, @function +_dl_linux_resolve: + /* Fix up the high 2 bits of the return address. */ + mov a14, a0 // save a0 temporarily + _call0 0f + .align 4 +0: extui a13, a0, 30, 2 + slli a13, a13, 30 + mov a0, a14 // restore a0 + slli a12, a0, 2 + srli a12, a12, 2 + or a12, a12, a13 + + /* Call the fixup function. */ + movi a8, _dl_linux_resolver + callx8 a8 + + /* Extract the target's frame size from the ENTRY instruction. */ + l32i a11, a10, 0 + extui a11, a11, XTENSA_IMM12_FLD_OFFSET, 12 + slli a11, a11, 3 + + addi a11, a11, -MIN_FRAME_SIZE + sub a11, sp, a11 + movsp sp, a11 + + /* Jump to the next instruction past the ENTRY. */ + addi a10, a10, 3 + jx a10 + .size _dl_linux_resolve, . - _dl_linux_resolve |