MIPS support to the linker
Change-Id: I37ec2d6c51d82bb9e9dbfef4b38c85366bead255
Signed-off-by: Chris Dearman <chris@mips.com>
Signed-off-by: Raghu Gandham <raghu@mips.com>
Signed-off-by: Bhanu Chetlapalli <bhanu@mips.com>
diff --git a/linker/arch/mips/begin.S b/linker/arch/mips/begin.S
new file mode 100644
index 0000000..b782947
--- /dev/null
+++ b/linker/arch/mips/begin.S
@@ -0,0 +1,107 @@
+/*
+ * 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.
+ */
+
+ .text
+ .align 4
+ .type __start,@function
+
+ .ent __start
+ .globl __start
+__start:
+ .set noreorder
+ bal 1f
+ nop
+1: .cpload $31
+ .set reorder
+
+ /* Discover the load address */
+ la $t0, 1f
+ bal 1f
+1: 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
+ addu $t1, $t0
+ li $t3, DT_PLTGOT
+ li $t4, DT_MIPS_LOCAL_GOTNO
+0:
+ lw $t2, 0($t1)
+ beqz $t2, .Lrelocate_local_got
+
+ bne $t2, $t3, 1f /* DT_PLTGOT? */
+ lw $s0, 4($t1)
+ addu $s0, $t0
+ b 2f
+
+1: bne $t2, $t4, 1f /* DT_MIPS_LOCAL_GOTNO? */
+ lw $s1, 4($t1)
+ b 2f
+
+1:
+2: addu $t1, 8
+ 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
+ */
+
+ addu $s0, 4
+ subu $s1, 1
+ lw $t1, ($s0)
+ bgez $t1, 9f
+ addu $s0, 4
+ subu $s1, 1
+ b 9f
+
+1: lw $t1, ($s0)
+ addu $t1, $t0
+ sw $t1, ($s0)
+ addu $s0, 4
+9: subu $s1, 1
+ bgez $s1, 1b
+
+ /* call linker_init */
+ move $a0, $sp
+ addiu $sp, -4*4 /* space for arg saves in linker_init */
+ la $t9, __linker_init
+ jalr $t9
+ move $t9, $v0
+ addu $sp, 4*4 /* restore sp */
+ j $t9
+ .end __start
+
+ .section .ctors, "wa"
+ .globl __CTOR_LIST__
+__CTOR_LIST__:
+ .long -1