kopia lustrzana https://github.com/espressif/esp-idf
113 wiersze
3.4 KiB
C
113 wiersze
3.4 KiB
C
/*
|
|
* 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; \
|
|
uint32_t tmp1 = 0, tmp2 = 0; \
|
|
asm volatile ( \
|
|
"rsr.ps %1 \n"\
|
|
"movi %2, ~" XTSTR( PS_WOE_MASK | PS_OWB_MASK | PS_CALLINC_MASK ) " \n"\
|
|
"and %1, %1, %2 \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"\
|
|
"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)); \
|
|
} while (0);
|
|
#endif // __ASSEMBLER__
|