[MIPS64] Dynamic linker

Change-Id: I937c7c776cae3d66e214798d5217a922cd106bfc
Signed-off-by: Chris Dearman <chris.dearman@imgtec.com>
Signed-off-by: Duane Sand <duane.sand@imgtec.com>

1 files changed, 128 insertions, 0 deletions

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