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/*
* SPDX-FileCopyrightText: 2020-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#pragma once
#include "xtensa/xtruntime.h"
#define RSR(reg, at) asm volatile ("rsr %0, %1" : "=r" (at) : "i" (reg))
#define WSR(reg, at) asm volatile ("wsr %0, %1" : : "r" (at), "i" (reg))
#define XSR(reg, at) asm volatile ("xsr %0, %1" : "+r" (at) : "i" (reg))
#define RER(reg, at) asm volatile ("rer %0, %1" : "=r" (at) : "r" (reg))
#define WITLB(at, as) asm volatile ("witlb %0, %1; \n isync \n " : : "r" (at), "r" (as))
#define WDTLB(at, as) asm volatile ("wdtlb %0, %1; \n dsync \n " : : "r" (at), "r" (as))
#define EXTRA_SAVE_AREA_SIZE 32
#define BASE_SAVE_AREA_SIZE 16
#define SAVE_AREA_OFFSET (EXTRA_SAVE_AREA_SIZE + BASE_SAVE_AREA_SIZE)
#define BASE_AREA_SP_OFFSET 12
/* The SET_STACK implements a setting a new stack pointer (sp or a1).
* to do this the need reset PS_WOE, reset WINDOWSTART, update SP, and return PS_WOE.
*
* In addition, if a windowOverflow8/12 happens the exception handler expects to be able to look at
* the previous frames stackpointer to find the extra save area. So this function will reserve space
* for this area as well as initialise the previous sp that points to it
*
* Note: It has 2 implementations one for using in assembler files (*.S) and one for using in C.
*
* C code prototype for SET_STACK:
* uint32_t ps_reg;
* uint32_t w_base;
*
* uint32_t sp = (uint32_t)new_sp - SAVE_AREA_OFFSET; \
*(uint32_t*)(sp - 12) = (uint32_t)new_sp; \
* RSR(PS, ps_reg);
* ps_reg &= ~(PS_WOE_MASK | PS_OWB_MASK | PS_CALLINC_MASK);
* WSR(PS, ps_reg);
*
* RSR(WINDOWBASE, w_base);
* WSR(WINDOWSTART, (1 << w_base));
*
* asm volatile ( "movi sp, "XTSTR( (SOC_DRAM_LOW + (SOC_DRAM_HIGH - SOC_DRAM_LOW) / 2) )"");
*
* RSR(PS, ps_reg);
* ps_reg |= (PS_WOE_MASK);
* WSR(PS, ps_reg);
*/
#ifdef __ASSEMBLER__
.macro SET_STACK new_sp tmp1 tmp2
addi tmp1, new_sp, -SAVE_AREA_OFFSET
addi tmp2, tmp1, -BASE_AREA_SP_OFFSET
s32i new_sp, tmp2, 0
addi new_sp, tmp1, 0
rsr.ps \tmp1
movi \tmp2, ~(PS_WOE_MASK | PS_OWB_MASK | PS_CALLINC_MASK)
and \tmp1, \tmp1, \tmp2
wsr.ps \tmp1
rsync
rsr.windowbase \tmp1
ssl \tmp1
movi \tmp1, 1
sll \tmp1, \tmp1
wsr.windowstart \tmp1
rsync
mov sp, \new_sp
rsr.ps \tmp1
movi \tmp2, (PS_WOE)
or \tmp1, \tmp1, \tmp2
wsr.ps \tmp1
rsync
.endm
#else
#define SET_STACK(new_sp) \
do { \
uint32_t sp = (uint32_t)new_sp - SAVE_AREA_OFFSET; \
*(uint32_t*)(sp - BASE_AREA_SP_OFFSET) = (uint32_t)new_sp; \
const uint32_t mask = ~(PS_WOE_MASK | PS_OWB_MASK | PS_CALLINC_MASK); \
uint32_t tmp1 = 0, tmp2 = 0; \
asm volatile ( \
"rsr.ps %1 \n"\
"and %1, %1, %3 \n"\
"wsr.ps %1 \n"\
"rsync \n"\
" \n"\
"rsr.windowbase %1 \n"\
"ssl %1 \n"\
"movi %1, 1 \n"\
"sll %1, %1 \n"\
"wsr.windowstart %1 \n"\
"rsync \n"\
" \n"\
"movi a0, 0\n" \
"mov sp, %0 \n"\
"rsr.ps %1 \n"\
" \n"\
"movi %2, " XTSTR( PS_WOE_MASK ) "\n"\
" \n"\
"or %1, %1, %2 \n"\
"wsr.ps %1 \n"\
"rsync \n"\
: "+r"(sp), "+r"(tmp1), "+r"(tmp2) : "r"(mask)); \
} while (0);
#endif // __ASSEMBLER__
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