###################################-*-asm*- # # Copyright (c) 2001 Xilinx, Inc.  All rights reserved. # # Xilinx, Inc. CONFIDENTIAL ## XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS" AS A # COURTESY TO YOU.  BY PROVIDING THIS DESIGN, CODE, OR INFORMATION AS# ONE POSSIBLE   IMPLEMENTATION OF THIS FEATURE, APPLICATION OR # STANDARD, XILINX IS MAKING NO REPRESENTATION THAT THIS IMPLEMENTATION# IS FREE FROM ANY CLAIMS OF INFRINGEMENT, AND YOU ARE RESPONSIBLE # FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE FOR YOUR IMPLEMENTATION.  # XILINX EXPRESSLY DISCLAIMS ANY WARRANTY WHATSOEVER WITH RESPECT TO # THE ADEQUACY OF THE IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO # ANY WARRANTIES OR REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE # FROM CLAIMS OF INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY # AND FITNESS FOR A PARTICULAR PURPOSE.# # crt0.s # #	C RunTime:#	Used for initialization of small data #	anchors and stack for programs compiled using #	Xilinx Gnu Tools. This routine also intializes the #	exception and interrupt handlers## $Id: crt0.s,v 1.1.4.2 2005/05/26 21:50:39 vasanth Exp $# #######################################/*      Vector map (Interrupts, Exceptions, Breakpoints)                 */#	# 0x00 #		Jump to Start#	# 0x04 #		nop #	# 0x08 #		Imm instr for soft exception address [Hi halfword]#	# 0x0c #		Jump to sof Exception handler        [Lo halfword]#	# 0x10 #		Imm instr for interrupt address      [Hi halfword]#	# 0x14 #		Jump to interrupt handler            [Lo halfword]#       # 0x18 #                nop - Reserved for breakpoint vector#       # 0x1C #                nop - Reserved for breakpoint vector#       # 0x20 #                Imm instr for hw exception address   [Hi halfword]#       # 0x24 #                Jump instr to hw exception handler   [Lo halfword]                        	.globl _start/*	Set the exception and interrupt address vectors    *//*	to jump to the appropriate handlers                */	.align 2	.ent _start	_start:        bri     _start1                 # 0x00        nop                             # 0x04        nop                             # 0x08          # Reserve space for software exception vector        nop                             # 0x0c        nop                             # 0x10          # Reserve space for interrupt vector        nop                             # 0x14        nop                             # 0x18          # Reserve space for breakpoint vector        nop                             # 0x1c        nop                             # 0x18          # Reserve space for hw exception vector        nop                             # 0x1c                _start1:/*	Set the Small Data Anchors and the Stack pointer  */	la	r13, r0, _SDA_BASE_	la	r2, r0, _SDA2_BASE_	la	r1, r0, _stack-16   	# 16 bytes (4 words are needed by					# crt for args and link reg )/*      Set the opcodes brai and imm for handlers         */	la	r6,r0,0xb8080000	# [opcode for brai ]	swi	r6,r0,0x4		# [brai opcode for reset]        	swi	r6,r0,0xc		# [brai opcode for exception]	swi	r6,r0,0x14		# [brai opcode for interrupt]	swi	r6,r0,0x24		# [brai opcode for hw exceptions]        	la	r6,r0,0xb0000000	# [opcode for imm ]	swi	r6,r0,0x0		# [imm opcode for reset]        	swi	r6,r0,0x8		# [imm opcode for exception]	swi	r6,r0,0x10		# [imm opocde for interrupt]	swi	r6,r0,0x20		# [imm opocde for hw exceptions]        /* 	Set Reset vector        */	la	r6,r0,_start1	sw	r6,r1,r0	lhu	r7,r1,r0	shi	r7,r0, 0x2  		# [imm for reset]	shi	r6,r0, 0x6		# [lower half for reset]        /* 	Set Software Exception Handler */	la	r6,r0,_exception_handler	sw	r6,r1,r0	lhu	r7,r1,r0	shi	r7,r0, 0xa  		# [imm for exception]	shi	r6,r0, 0xe		# [lower half for exception ]/* 	Set Interrupt Handler */	la	r6,r0,_interrupt_handler	sw	r6,r1,r0	lhu	r7,r1,r0	shi	r7,r0, 0x12 		# [imm for exception]	shi	r6,r0, 0x16		# [lower half for intterupt ]/*      Set HW Exception Handler */        la      r6,r0,_hw_exception_handler        sw      r6,r1,r0        lhu     r7,r1,r0        shi     r7,r0, 0x22             # [imm for exception]        shi     r6,r0, 0x26             # [lower half for hw exception]                /*	initialize bss sections				  */	brlid	r15,_crtinit	nop/* 	Adjust the stack pointer 			  */	addi	r1,r1,16/*      Fall through to exit                              */        .end _start                /* 	Use this exit function 	                          */        .globl exit                  # exit library call         .ent exit        exit:	bri	exit	.end exit