[MIPS64] Dynamic linker
Change-Id: I937c7c776cae3d66e214798d5217a922cd106bfc
Signed-off-by: Chris Dearman <chris.dearman@imgtec.com>
Signed-off-by: Duane Sand <duane.sand@imgtec.com>
diff --git a/linker/arch/mips64/begin.S b/linker/arch/mips64/begin.S
new file mode 100644
index 0000000..9a85925
--- /dev/null
+++ b/linker/arch/mips64/begin.S
@@ -0,0 +1,128 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <machine/asm.h>
+
+#if (_MIPS_SIM == _ABIO32) || (_MIPS_SIM == _ABI32)
+#define ELF_DYNSZ 8
+#define ELF_DYN_TAG 0
+#define ELF_DYN_VAL 4
+#define GOTENT_SZ 4
+#else
+#define ELF_DYNSZ 16
+#define ELF_DYN_TAG 0
+#define ELF_DYN_VAL 8
+#define GOTENT_SZ 8
+#endif
+
+ .text
+ .align 4
+ .type __start,@function
+
+ .ent __start
+ .globl __start
+__start:
+ .set noreorder
+ bal 1f
+ nop
+1:
+#if (_MIPS_SIM == _ABIO32) || (_MIPS_SIM == _ABI32)
+ .cpload ra
+#else
+ .cpsetup ra, $0, 1b
+#endif
+ .set reorder
+
+ /* Discover the load address */
+ LA t0, 1b
+ PTR_SUBU t0, ra, t0
+
+#define DT_PLTGOT 3
+#define DT_MIPS_LOCAL_GOTNO 0x7000000a
+
+ /* Search dynamic table for DT_MIPS_LOCAL_GOTNO and DT_PLTGOT values */
+ LA t1, _DYNAMIC
+ PTR_ADDU t1, t0
+ LI t3, DT_PLTGOT
+ LI ta0, DT_MIPS_LOCAL_GOTNO
+0:
+ REG_L t2, ELF_DYN_TAG(t1)
+ beqz t2, .Lrelocate_local_got
+
+ bne t2, t3, 1f /* DT_PLTGOT? */
+ REG_L s0, ELF_DYN_VAL(t1)
+ PTR_ADDU s0, t0
+ b 2f
+
+1:
+ bne t2, ta0, 2f /* DT_MIPS_LOCAL_GOTNO? */
+ REG_L s1, ELF_DYN_VAL(t1)
+
+2: PTR_ADDU t1, ELF_DYNSZ
+ b 0b
+
+.Lrelocate_local_got:
+ /*
+ * Relocate the local GOT entries
+ * got[0] is address of lazy resolver function
+ * got[1] may be used for a GNU extension
+ */
+
+ PTR_ADDU s0, GOTENT_SZ
+ SUBU s1, 1
+ PTR_L t1, (s0)
+ bgez t1, 9f
+ PTR_ADDU s0, GOTENT_SZ
+ SUBU s1, 1
+ b 9f
+
+1: PTR_L t1, (s0)
+ PTR_ADDU t1, t0
+ PTR_S t1, (s0)
+ PTR_ADDU s0, GOTENT_SZ
+9: SUBU s1, 1
+ bgez s1, 1b
+
+ /* call linker_init */
+ move a0, sp
+#if (_MIPS_SIM == _ABIO32) || (_MIPS_SIM == _ABI32)
+ PTR_SUBU sp, 4*REGSZ /* space for arg saves in linker_init */
+#endif
+ jal __linker_init
+#if (_MIPS_SIM == _ABIO32) || (_MIPS_SIM == _ABI32)
+ PTR_ADDU sp, 4*REGSZ /* restore sp */
+#endif
+ move t9, v0
+ j t9
+ .end __start
+
+/* FIXME:Is this still needed? */
+ .section .ctors, "wa"
+ .globl __CTOR_LIST__
+__CTOR_LIST__:
+ .long -1