crt0.S 8.47 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
/****************************************************************************
**
**  Name: crt0ram.S
**
**  Description:
**        Implements boot-code that calls LatticeDDInit (that calls main())
**        Implements exception handlers (actually, redirectors)
**
**  $Revision: $
**
** Disclaimer:
**
**   This source code is intended as a design reference which
**   illustrates how these types of functions can be implemented.  It
**   is the user's responsibility to verify their design for
**   consistency and functionality through the use of formal
**   verification methods.  Lattice Semiconductor provides no warranty
**   regarding the use or functionality of this code.
**
** --------------------------------------------------------------------
**
**                     Lattice Semiconductor Corporation
**                     5555 NE Moore Court
**                     Hillsboro, OR 97214
**                     U.S.A
**
**                     TEL: 1-800-Lattice (USA and Canada)
**                          (503)268-8001 (other locations)
**
**                     web:   http://www.latticesemi.com
**                     email: techsupport@latticesemi.com
**
** --------------------------------------------------------------------------
**
**  Change History (Latest changes on top)
**
**  Ver    Date        Description
** --------------------------------------------------------------------------
**  3.8   Apr-15-2011  Added __MICO_USER_<handler>_HANDLER__ preprocessor to 
**                     allow customers to implement their own handlers for:
**                     DATA_ABORT, INST_ABORT
**  
**  3.1   Jun-18-2008  Added __MICO_NO_INTERRUPTS__ preprocessor
**                     option to exclude invoking MicoISRHandler
**                     to reduce code-size in apps that don't use
**                     interrupts
**
**  3.0   Mar-25-2008  Added Header
**
**---------------------------------------------------------------------------
*****************************************************************************/
52

53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76
/*
 * LatticeMico32 C startup code.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 2. 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 AUTHOR 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 AUTHOR 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.
 */
77 78 79
#define __ASSEMBLY__
#include "include/revision.h"
#include "ppsi/proto-ext-whiterabbit/wr-api.h"
80
#include "arch/lm32/crt0.h"
81
#include "include/generated/autoconf.h"
82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107
/* From include/sys/signal.h */  
#define SIGINT  2   /* interrupt */
#define SIGTRAP 5   /* trace trap */
#define SIGFPE  8   /* arithmetic exception */
#define SIGSEGV 11  /* segmentation violation */

//#define MICO32_FULL_CONTEXT_SAVE_RESTORE

/* Exception handlers - Must be 32 bytes long. */
        .section    .boot, "ax", @progbits
	
        .global	_start  
_start: 
	   
        .global _reset_handler
        .type 	_reset_handler, @function
_reset_handler:
    xor r0, r0, r0
    wcsr    IE, r0
    wcsr    IM, r0
    mvhi    r1, hi(_reset_handler)
    ori     r1, r1, lo(_reset_handler)
    wcsr    EBA, r1
    calli   _crt0
    nop
        .size	_reset_handler, .-_reset_handler
108

109
.org WRPC_MARK
110 111 112 113 114
/* Used by the dumping tool to identify byte ordering */	
.ascii	"WRPC----"
.int	0x01234567
.short	0x89ab, 0xcdef
/* Pointer to structures, for the dumping tool */
115 116 117 118 119 120 121 122
.org SOFTPLL_PADDR
	.word softpll
.org FIFO_LOG_PADDR
	.word fifo_log
.org PPI_STATIC_PADDR
	.word ppi_static
.org STATS_PADDR
	.word stats
123

124
.org UPTIME_SEC_ADDR
125 126 127
.global uptime_sec
uptime_sec:
	.word 0
128

129
.org VERSION_WRPC_ADDR
130 131 132 133
.global version_wrpc
version_wrpc:
	.byte WRPC_SHMEM_VERSION

134
.org VERSION_PPSI_ADDR
135 136 137 138
.global version_ppsi
version_ppsi:
	.byte WRS_PPSI_SHMEM_VERSION

139 140 141 142 143 144 145 146 147 148
/* Pointer to a structure used by testbenches, use only when
 * CONFIG_WR_NODE_SIM is set */
.org HDL_TESTBENCH_PADDR
.global hdl_testbench_p
hdl_testbench_p:
#ifdef CONFIG_WR_NODE_SIM
	.word hdl_testbench
#else
	.word 0
#endif
149
.extern _irq_entry
150
.org 0xc0
151 152 153 154 155 156 157
        .global _interrupt_handler
        .type 	_interrupt_handler, @function
_interrupt_handler:
    sw      (sp+0), ra
    calli   _save_all
    mvi     r1, SIGINT
#ifndef __MICO_NO_INTERRUPTS__
158
    calli  _irq_entry
159 160 161 162 163 164 165
#else
    wcsr    IE, r0
#endif
    bi      _restore_all_and_return
    nop
    nop
    nop
166

167
.org 0x100
168 169 170 171 172 173 174 175 176
        .global _crt0
        .type 	_crt0, @function
_crt0:
    /* Clear r0 */
    xor     r0, r0, r0
    /* Setup stack and global pointer */
    mvhi    sp, hi(_fstack)
    ori     sp, sp, lo(_fstack)
	
177 178 179 180 181 182
    mvhi    r1, hi(_fbss)
    ori     r1, r1, lo(_fbss)
    mvi     r2, 0
    mvhi    r3, hi(_ebss)
    ori     r3, r3, lo(_ebss)
    sub     r3, r3, r1
183
    calli   memset
184 185 186
    mvi     r1, 0
    mvi     r2, 0
    mvi     r3, 0
187
    calli   main
Tomasz Wlostowski's avatar
Tomasz Wlostowski committed
188

189 190
loopf:
	bi loopf
191

192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300
        .global _save_all
        .type 	_save_all, @function
_save_all:
#ifdef MICO32_FULL_CONTEXT_SAVE_RESTORE
    addi    sp, sp, -128
#else
    addi    sp, sp, -60
#endif
    sw      (sp+4), r1
    sw      (sp+8), r2
    sw      (sp+12), r3
    sw      (sp+16), r4
    sw      (sp+20), r5
    sw      (sp+24), r6
    sw      (sp+28), r7
    sw      (sp+32), r8
    sw      (sp+36), r9
    sw      (sp+40), r10
#ifdef MICO32_FULL_CONTEXT_SAVE_RESTORE
    sw      (sp+44), r11
    sw      (sp+48), r12
    sw      (sp+52), r13
    sw      (sp+56), r14
    sw      (sp+60), r15
    sw      (sp+64), r16
    sw      (sp+68), r17
    sw      (sp+72), r18
    sw      (sp+76), r19
    sw      (sp+80), r20
    sw      (sp+84), r21
    sw      (sp+88), r22
    sw      (sp+92), r23
    sw      (sp+96), r24
    sw      (sp+100), r25
    sw      (sp+104), r26
    sw      (sp+108), r27
    sw      (sp+120), ea
    sw      (sp+124), ba
    /* ra and sp need special handling, as they have been modified */
    lw      r1, (sp+128)
    sw      (sp+116), r1
    mv      r1, sp
    addi    r1, r1, 128
    sw      (sp+112), r1
#else
    sw      (sp+52), ea
    sw      (sp+56), ba
    /* ra and sp need special handling, as they have been modified */
    lw      r1, (sp+60)
    sw      (sp+48), r1
    mv      r1, sp
    addi    r1, r1, 60
    sw      (sp+44), r1
#endif
//    xor     r1, r1, r1
//    wcsr    ie, r1
    ret
        .size  	_save_all, .-_save_all
	
        .global _restore_all_and_return
        .type 	_restore_all_and_return, @function
    /* Restore all registers and return from exception */
_restore_all_and_return:
//    addi    r1, r0, 2
//    wcsr    ie, r1
    lw      r1, (sp+4)
    lw      r2, (sp+8) 
    lw      r3, (sp+12) 
    lw      r4, (sp+16) 
    lw      r5, (sp+20) 
    lw      r6, (sp+24) 
    lw      r7, (sp+28) 
    lw      r8, (sp+32) 
    lw      r9, (sp+36) 
    lw      r10, (sp+40)
#ifdef MICO32_FULL_CONTEXT_SAVE_RESTORE
    lw      r11, (sp+44)
    lw      r12, (sp+48)
    lw      r13, (sp+52)
    lw      r14, (sp+56)
    lw      r15, (sp+60)
    lw      r16, (sp+64)
    lw      r17, (sp+68)
    lw      r18, (sp+72)
    lw      r19, (sp+76)
    lw      r20, (sp+80)
    lw      r21, (sp+84)
    lw      r22, (sp+88)
    lw      r23, (sp+92)
    lw      r24, (sp+96)
    lw      r25, (sp+100)
    lw      r26, (sp+104)
    lw      r27, (sp+108)
    lw      ra, (sp+116)
    lw      ea, (sp+120)
    lw      ba, (sp+124)
    /* Stack pointer must be restored last, in case it has been updated */
    lw      sp, (sp+112)
#else
    lw      ra, (sp+48)
    lw      ea, (sp+52)
    lw      ba, (sp+56)
    /* Stack pointer must be restored last, in case it has been updated */
    lw      sp, (sp+44)
#endif
    nop
    eret
        .size   _restore_all_and_return, .-_restore_all_and_return