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/*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright © 2024 Keith Packard
*
* 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.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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 HOLDER 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 <picolibc.h>
#include <machine/core-isa.h>
.begin no-absolute-literals
.section .reset.entry,"ax"
.align 4
.globl _start
.type _start, @function
_start:
j _reset_handler
.size _start, . - _start
.section .reset.text,"ax"
.literal_position
.align 4
.global _reset_handler
_reset_handler:
movi sp, __stack
movi a0, 0
wsr a0, INTENABLE
#if XCHAL_HAVE_ABSOLUTE_LITERALS
wsr a0, LITBASE
#endif
rsync
#if XCHAL_HAVE_S32C1I && (XCHAL_HW_MIN_VERSION >= XTENSA_HWVERSION_RC_2009_0)
#if XCHAL_DCACHE_IS_COHERENT
/* MX -- internal for writeback, RCW otherwise */
movi a3, 0x25
#else
/* non-MX -- always RCW */
movi a3, 0x15
#endif /* XCHAL_DCACHE_IS_COHERENT */
wsr a3, ATOMCTL
#endif
#define PS_INTLEVEL_MASK 0x0000000F
#define PS_INTLEVEL(n) ((n)&PS_INTLEVEL_MASK)
#define PS_WOE 0x00040000
#define PS_UM 0x00000020
# ifdef __XTENSA_CALL0_ABI__
/*
* PS.WOE = 0
* PS.UM = 0
* PS.EXCM = 0
* PS.INTLEVEL = 0
*/
movi a3, PS_INTLEVEL(0)
# else
movi a2, 1
wsr a2, WINDOWSTART
wsr a0, WINDOWBASE
rsync
movi a0, 0
/*
* PS.WOE = 1
* PS.UM = 0
* PS.EXCM = 0
* PS.INTLEVEL = 0
*/
movi a3, PS_WOE|PS_INTLEVEL(0)
# endif
wsr a3, PS
rsync
movi a0, _cstart
#ifdef __XTENSA_CALL0_ABI__
callx0 a0
#else
callx4 a0
#endif
.size _reset_handler, . - _reset_handler
.end no-absolute-literals
#ifndef __XTENSA_CALL0_ABI__
.section .vectors,"ax"
.org 0x0
.globl _WindowOverflow4
.type _WindowOverflow4, @function
_WindowOverflow4:
s32e a0, a5, -16
s32e a1, a5, -12
s32e a2, a5, -8
s32e a3, a5, -4
rfwo
.size _WindowOverflow4, . - _WindowOverflow4
.org 0x40
.globl _WindowUnderflow4
.type _WindowUnderflow4, @function
_WindowUnderflow4:
l32e a0, a5, -16
l32e a1, a5, -12
l32e a2, a5, -8
l32e a3, a5, -4
rfwu
.size _WindowUnderflow4, . - _WindowUnderflow4
.org 0x80
.globl _WindowOverflow8
.type _WindowOverflow8, @function
_WindowOverflow8:
s32e a0, a9, -16
l32e a0, a1, -12
s32e a1, a9, -12
s32e a2, a9, -8
s32e a3, a9, -4
s32e a4, a0, -32
s32e a5, a0, -28
s32e a6, a0, -24
s32e a7, a0, -20
rfwo
.size _WindowOverflow8, . - _WindowOverflow8
.org 0xc0
.globl _WindowUnderflow8
.type _WindowUnderflow8, @function
_WindowUnderflow8:
l32e a0, a9, -16
l32e a1, a9, -12
l32e a2, a9, -8
l32e a7, a1, -12
l32e a3, a9, -4
l32e a4, a7, -32
l32e a5, a7, -28
l32e a6, a7, -24
l32e a7, a7, -20
rfwu
.size _WindowUnderflow8, . - _WindowUnderflow8
.org 0x100
.globl _WindowOverflow12
.type _WindowOverflow12, @function
_WindowOverflow12:
s32e a0, a13, -16
l32e a0, a1, -12
s32e a1, a13, -12
s32e a2, a13, -8
s32e a3, a13, -4
s32e a4, a0, -48
s32e a5, a0, -44
s32e a6, a0, -40
s32e a7, a0, -36
s32e a8, a0, -32
s32e a9, a0, -28
s32e a10, a0, -24
s32e a11, a0, -20
rfwo
.size _WindowOverflow12, . - _WindowOverflow12
.org 0x140
.globl _WindowUnderflow12
.type _WindowUnderflow12, @function
_WindowUnderflow12:
l32e a0, a13, -16
l32e a1, a13, -12
l32e a2, a13, -8
l32e a11, a1, -12
l32e a3, a13, -4
l32e a4, a11, -48
l32e a5, a11, -44
l32e a6, a11, -40
l32e a7, a11, -36
l32e a8, a11, -32
l32e a9, a11, -28
l32e a10, a11, -24
l32e a11, a11, -20
rfwu
.size _WindowUnderflow12, . - _WindowUnderflow12
#endif
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