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esp-idf/components/esp_system/port/soc/esp32/highint_hdl.S
Darian Leung 3336b057d6 xtensa: Move saving of a0 register to match upstream 
Upstream xtensa exception handling will save PS, PC, and a0 registers
together when saving a minimal context. This commit ppdates the xtensa
exception handling to match upstream behavior.
2022-02-03 17:08:14 +08:00

555 lines
17 KiB
ArmAsm
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// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <xtensa/coreasm.h>
#include <xtensa/corebits.h>
#include <xtensa/config/system.h>
#include "freertos/xtensa_context.h"
#include "freertos/xtensa_rtos.h"
#include "esp_private/panic_reason.h"
#include "sdkconfig.h"
#include "soc/soc.h"
#include "soc/dport_reg.h"
#include "soc/timer_group_reg.h"
/*
Interrupt , a high-priority interrupt, is used for several things:
- IPC_ISR handler
- Cache error panic handler
- Interrupt watchdog panic handler
*/
#if CONFIG_ESP_SYSTEM_CHECK_INT_LEVEL_5
#define LX_INTR_STACK_SIZE 12
#define LX_INTR_A2_OFFSET 0
#define LX_INTR_A3_OFFSET 4
#define LX_INTR_A4_OFFSET 8
#define EPC_X EPC_5
#define EXCSAVE_X EXCSAVE_5
#define RFI_X 5
#define xt_highintx xt_highint5
#elif CONFIG_ESP_SYSTEM_CHECK_INT_LEVEL_4
#define LX_INTR_STACK_SIZE 12
#define LX_INTR_A2_OFFSET 0
#define LX_INTR_A3_OFFSET 4
#define LX_INTR_A4_OFFSET 8
#define EPC_X EPC_4
#define EXCSAVE_X EXCSAVE_4
#define RFI_X 4
#define xt_highintx xt_highint4
#endif /* CONFIG_ESP_SYSTEM_CHECK_INT_LEVEL_5 */
/*
--------------------------------------------------------------------------------
Macro wdt_clr_intr_status - Clear the WDT interrupt status.
Macro wdt_feed - Feed the WDT.
Input : "dev" - Beginning address of the peripheral registers
Macro get_int_status_tg1wdt - Get the ETS_TG1_WDT_LEVEL_INTR_SOURCE bit in interrupt status
output : "reg" - Store the result into the reg
--------------------------------------------------------------------------------
*/
#define TIMG1_REG_OFFSET(reg) ((reg) - REG_TIMG_BASE(1))
#define TIMG1_WDTWPROTECT_OFFSET TIMG1_REG_OFFSET(TIMG_WDTWPROTECT_REG(1))
#define TIMG1_INT_CLR_OFFSET TIMG1_REG_OFFSET(TIMG_INT_CLR_TIMERS_REG(1))
#define TIMG1_WDT_STG0_HOLD_OFFSET TIMG1_REG_OFFSET(TIMG_WDTCONFIG2_REG(1))
#define TIMG1_WDT_STG1_HOLD_OFFSET TIMG1_REG_OFFSET(TIMG_WDTCONFIG3_REG(1))
#define TIMG1_WDT_FEED_OFFSET TIMG1_REG_OFFSET(TIMG_WDTFEED_REG(1))
#define UART0_DATA_REG (0x3FF40078)
.macro wdt_clr_intr_status dev
movi a2, \dev
movi a3, TIMG_WDT_WKEY_VALUE
s32i a3, a2, TIMG1_WDTWPROTECT_OFFSET /* disable write protect */
memw
l32i a4, a2, TIMG1_INT_CLR_OFFSET
memw
movi a3, 4
or a3, a4, a3
s32i a3, a2, TIMG1_INT_CLR_OFFSET /* clear 1st stage timeout interrupt */
memw
movi a3, 0
s32i a3, a2, TIMG1_WDTWPROTECT_OFFSET /* enable write protect */
memw
.endm
.macro wdt_feed dev
movi a2, \dev
movi a3, TIMG_WDT_WKEY_VALUE
s32i a3, a2, TIMG1_WDTWPROTECT_OFFSET /* disable write protect */
memw
movi a4, _lx_intr_livelock_max
l32i a4, a4, 0
memw
addi a4, a4, 1
movi a3, (CONFIG_ESP_INT_WDT_TIMEOUT_MS<<1)
quou a3, a3, a4
s32i a3, a2, TIMG1_WDT_STG0_HOLD_OFFSET /* set timeout before interrupt */
memw
movi a3, (CONFIG_ESP_INT_WDT_TIMEOUT_MS<<2)
s32i a3, a2, TIMG1_WDT_STG1_HOLD_OFFSET /* set timeout before system reset */
memw
movi a3, 1
s32i a3, a2, TIMG1_WDT_FEED_OFFSET /* feed wdt */
memw
movi a3, 0
s32i a3, a2, TIMG1_WDTWPROTECT_OFFSET /* enable write protect */
memw
.endm
.macro get_int_status_tg1wdt reg
rsr \reg, INTERRUPT
extui \reg, \reg, ETS_T1_WDT_CACHEERR_INUM, 1
beqz \reg, 99f /* not ETS_T1_WDT_INUM or ETS_CACHEERR_INUM */
getcoreid \reg
bnez \reg, 98f
/* core 0 */
movi \reg, UART0_DATA_REG
l32i \reg, \reg, 0 /* Workaround for DPORT read error, for silicon revision 0~2 (ECO V0 ~ ECO V2). */
movi \reg, DPORT_PRO_INTR_STATUS_0_REG
l32i \reg, \reg, 0
extui \reg, \reg, ETS_TG1_WDT_LEVEL_INTR_SOURCE, 1
j 99f
98: /* core 1 */
movi \reg, UART0_DATA_REG
l32i \reg, \reg, 0 /* Workaround for DPORT read error, for silicon revision 0~2 (ECO V0 ~ ECO V2). */
movi \reg, DPORT_APP_INTR_STATUS_0_REG
l32i \reg, \reg, 0
extui \reg, \reg, ETS_TG1_WDT_LEVEL_INTR_SOURCE, 1
99:
.endm
.data
_lx_intr_stack:
.space LX_INTR_STACK_SIZE*portNUM_PROCESSORS /* This allocates stacks for each individual CPU. */
#if CONFIG_ESP32_ECO3_CACHE_LOCK_FIX && CONFIG_ESP_INT_WDT
.global _lx_intr_livelock_counter
.global _lx_intr_livelock_max
.align 16
_lx_intr_livelock_counter:
.word 0
_lx_intr_livelock_max:
.word 0
_lx_intr_livelock_sync:
.word 0, 0
_lx_intr_livelock_app:
.word 0
_lx_intr_livelock_pro:
.word 0
#endif
.section .iram1,"ax"
.global xt_highintx
.type xt_highintx,@function
.align 4
xt_highintx:
#ifndef CONFIG_FREERTOS_UNICORE
/* See if we're here for the IPC_ISR interrupt */
rsr a0, INTERRUPT
extui a0, a0, ETS_IPC_ISR_INUM, 1
beqz a0, 1f
/* Jump to `esp_ipc_isr_handler` which is non-returning. We need to use `jx`
* because on Xtensa, `j` instruction can only refer to a label which
* is in the range [-131068;+131075]. If the destination is out of scope,
* linking will fail. So, to make sure we will always be able to jump to
* that subroutine, retrieve its address and store it in a register. */
movi a0, esp_ipc_isr_handler
jx a0
1:
#endif /* not CONFIG_FREERTOS_UNICORE */
#if CONFIG_ESP32_ECO3_CACHE_LOCK_FIX && CONFIG_ESP_INT_WDT
#if CONFIG_BTDM_CTRL_HLI
/* Timer 2 interrupt */
rsr a0, INTENABLE
extui a0, a0, 16, 1
beqz a0, 1f
rsr a0, INTERRUPT
extui a0, a0, 16, 1
bnez a0, .handle_multicore_debug_int
1:
#endif /* CONFIG_BTDM_CTRL_HLI */
/* ETS_T1_WDT_INUM */
#if CONFIG_ESP_SYSTEM_CHECK_INT_LEVEL_5
get_int_status_tg1wdt a0
#elif CONFIG_ESP_SYSTEM_CHECK_INT_LEVEL_4
/* See if we're here for the tg1 watchdog interrupt */
rsr a0, INTERRUPT
extui a0, a0, ETS_T1_WDT_INUM, 1
#endif /* CONFIG_ESP_SYSTEM_CHECK_INT_LEVEL_5 */
beqz a0, 1f
wsr a5, depc /* use DEPC as temp storage */
movi a0, _lx_intr_livelock_counter
l32i a0, a0, 0
movi a5, _lx_intr_livelock_max
l32i a5, a5, 0
bltu a0, a5, .handle_livelock_int /* _lx_intr_livelock_counter < _lx_intr_livelock_max */
rsr a5, depc /* restore a5 */
#endif
1: /* ETS_CACHEERR_INUM or ETS_T1_WDT_INUM */
/* Allocate exception frame and save minimal context. */
mov a0, sp
addi sp, sp, -XT_STK_FRMSZ
s32i a0, sp, XT_STK_A1
#if XCHAL_HAVE_WINDOWED
s32e a0, sp, -12 /* for debug backtrace */
#endif
rsr a0, PS /* save interruptee's PS */
s32i a0, sp, XT_STK_PS
rsr a0, EPC_X /* save interruptee's PC */
s32i a0, sp, XT_STK_PC
rsr a0, EXCSAVE_X /* save interruptee's a0 */
s32i a0, sp, XT_STK_A0
#if XCHAL_HAVE_WINDOWED
s32e a0, sp, -16 /* for debug backtrace */
#endif
s32i a12, sp, XT_STK_A12 /* _xt_context_save requires A12- */
s32i a13, sp, XT_STK_A13 /* A13 to have already been saved */
call0 _xt_context_save
/* Save vaddr into exception frame */
rsr a0, EXCVADDR
s32i a0, sp, XT_STK_EXCVADDR
/* Figure out reason, save into EXCCAUSE reg */
#if CONFIG_ESP_SYSTEM_CHECK_INT_LEVEL_5
get_int_status_tg1wdt a0
bnez a0, 1f
/* TODO: Clear the MEMACCESS_ERR interrupt status. */
#elif CONFIG_ESP_SYSTEM_CHECK_INT_LEVEL_4
rsr a0, INTERRUPT
extui a0, a0, ETS_MEMACCESS_ERR_INUM, 1 /* get cacheerr int bit */
beqz a0, 1f
#endif /* CONFIG_ESP_SYSTEM_CHECK_INT_LEVEL_5 */
/* Kill this interrupt; we cannot reset it. */
rsr a0, INTENABLE
movi a4, ~(1<<ETS_MEMACCESS_ERR_INUM)
and a0, a4, a0
wsr a0, INTENABLE
movi a0, PANIC_RSN_CACHEERR
j 9f
1:
#if CONFIG_ESP_SYSTEM_CHECK_INT_LEVEL_5
/* Clear the WDT interrupt status. */
wdt_clr_intr_status TIMERG1
#endif /* CONFIG_ESP_SYSTEM_CHECK_INT_LEVEL_5 */
#if CONFIG_ESP_INT_WDT_CHECK_CPU1
/* Check if the cause is the app cpu failing to tick.*/
movi a0, int_wdt_app_cpu_ticked
l32i a0, a0, 0
bnez a0, 2f
/* It is. Modify cause. */
movi a0,PANIC_RSN_INTWDT_CPU1
j 9f
2:
#endif
/* Set EXCCAUSE to reflect cause of the wdt int trigger */
movi a0,PANIC_RSN_INTWDT_CPU0
9:
/* Found the reason, now save it. */
s32i a0, sp, XT_STK_EXCCAUSE
/* Set up PS for C, disable all interrupts except NMI and debug, and clear EXCM. */
movi a0, PS_INTLEVEL(5) | PS_UM | PS_WOE
wsr a0, PS
/* Call panic handler */
mov a6,sp
call4 panicHandler
call0 _xt_context_restore
l32i a0, sp, XT_STK_PS /* retrieve interruptee's PS */
wsr a0, PS
l32i a0, sp, XT_STK_PC /* retrieve interruptee's PC */
wsr a0, EPC_X
l32i a0, sp, XT_STK_A0 /* retrieve interruptee's A0 */
l32i sp, sp, XT_STK_A1 /* remove exception frame */
rsync /* ensure PS and EPC written */
rsr a0, EXCSAVE_X /* restore a0 */
rfi RFI_X
#if CONFIG_ESP32_ECO3_CACHE_LOCK_FIX && CONFIG_ESP_INT_WDT
#if CONFIG_BTDM_CTRL_HLI
#define APB_ITCTRL (0x3f00)
#define APB_DCRSET (0x200c)
#define ERI_ADDR(APB) (0x100000 + (APB))
.align 4
.handle_multicore_debug_int:
wsr a2, depc /* temp storage */
rsr.ccount a2
addmi a2, a2, (CONFIG_ESP32_DEFAULT_CPU_FREQ_MHZ*50)
wsr a2, CCOMPARE2
/* Enable Integration Mode */
movi a2, ERI_ADDR(APB_ITCTRL)
rer a0, a2
addi a0, a0, 1
wer a0, a2
/* Enable and emit BreakOut signal */
movi a2, ERI_ADDR(APB_DCRSET)
rer a0, a2
movi a2, 0x1020000
or a0, a2, a0
movi a2, ERI_ADDR(APB_DCRSET)
wer a0, a2
.rept 4
nop
.endr
/* Enable Normal Mode */
movi a2, ERI_ADDR(APB_ITCTRL)
rer a0, a2
movi a2, ~0x1
and a0, a2, a0
movi a2, ERI_ADDR(APB_ITCTRL)
wer a0, a2
rsr a2, depc
rsr a0, EXCSAVE_5 /* restore a0 */
rfi 5
#endif /* CONFIG_BTDM_CTRL_HLI */
/*
--------------------------------------------------------------------------------
Macro intr_matrix_map - Attach an CPU interrupt to a hardware source.
Input : "addr" - Interrupt map configuration base address
Input : "src" - Interrupt source.
Input : "inum" - Interrupt number.
--------------------------------------------------------------------------------
*/
.macro intr_matrix_map addr src inum
movi a2, \src
slli a2, a2, 2
movi a3, \addr
add a3, a3, a2
movi a2, \inum
s32i a2, a3, 0
memw
.endm
.align 4
.handle_livelock_int:
getcoreid a5
/* Save A2, A3, A4 so we can use those registers */
movi a0, LX_INTR_STACK_SIZE
mull a5, a5, a0
movi a0, _lx_intr_stack
add a0, a0, a5
s32i a2, a0, LX_INTR_A2_OFFSET
s32i a3, a0, LX_INTR_A3_OFFSET
s32i a4, a0, LX_INTR_A4_OFFSET
/* Here, we can use a0, a2, a3, a4, a5 registers */
getcoreid a5
rsil a0, CONFIG_ESP32_DPORT_DIS_INTERRUPT_LVL /* disable nested interrupt */
beqz a5, 1f
movi a2, _lx_intr_livelock_app
l32i a3, a2, 0
addi a3, a3, 1
s32i a3, a2, 0
/* Dual core synchronization, ensuring that both cores enter interrupts */
1: movi a4, 0x1
movi a2, _lx_intr_livelock_sync
addx4 a3, a5, a2
s32i a4, a3, 0
1: movi a2, _lx_intr_livelock_sync
movi a3, 1
addx4 a3, a3, a2
l32i a2, a2, 0
l32i a3, a3, 0
and a2, a2, a3
beqz a2, 1b
beqz a5, 1f /* Pro cpu (Core 0) jump bypass */
movi a2, _lx_intr_livelock_app
l32i a2, a2, 0
bnei a2, 2, 1f
movi a2, _lx_intr_livelock_counter /* _lx_intr_livelock_counter++ */
l32i a3, a2, 0
addi a3, a3, 1
s32i a3, a2, 0
/*
The delay time can be calculated by the following formula:
T = ceil(0.25 + max(t1, t2)) us
t1 = 80 / f1, t2 = (1 + 14/N) * 20 / f2
f1: PSRAM access frequency, unit: MHz.
f2: Flash access frequency, unit: MHz.
When flash is slow/fast read, N = 1.
When flash is DOUT/DIO read, N = 2.
When flash is QOUT/QIO read, N = 4.
*/
1: rsr.ccount a2
#if defined(CONFIG_ESPTOOLPY_FLASHMODE_QIO) || defined(CONFIG_ESPTOOLPY_FLASHMODE_QOUT)
# if defined(CONFIG_ESPTOOLPY_FLASHFREQ_80M) && defined(CONFIG_SPIRAM_SPEED_80M)
movi a3, 480
# elif defined(CONFIG_ESPTOOLPY_FLASHFREQ_80M) && defined(CONFIG_SPIRAM_SPEED_40M)
movi a3, 720
# elif defined(CONFIG_ESPTOOLPY_FLASHFREQ_40M) && defined(CONFIG_SPIRAM_SPEED_40M)
movi a3, 720
# elif defined(CONFIG_ESPTOOLPY_FLASHFREQ_26M) && defined(CONFIG_SPIRAM_SPEED_40M)
movi a3, 960
# else
movi a3, 1200
# endif
#elif defined(CONFIG_ESPTOOLPY_FLASHMODE_DIO) || defined(CONFIG_ESPTOOLPY_FLASHMODE_DOUT)
# if defined(CONFIG_ESPTOOLPY_FLASHFREQ_80M) && defined(CONFIG_SPIRAM_SPEED_80M)
movi a3, 720
# elif defined(CONFIG_ESPTOOLPY_FLASHFREQ_80M) && defined(CONFIG_SPIRAM_SPEED_40M)
movi a3, 720
# elif defined(CONFIG_ESPTOOLPY_FLASHFREQ_40M) && defined(CONFIG_SPIRAM_SPEED_40M)
movi a3, 1200
# elif defined(CONFIG_ESPTOOLPY_FLASHFREQ_26M) && defined(CONFIG_SPIRAM_SPEED_40M)
movi a3, 1680
# else
movi a3, 2160
# endif
#endif
2: rsr.ccount a4 /* delay_us(N) */
sub a4, a4, a2
bltu a4, a3, 2b
beqz a5, 2f
movi a2, _lx_intr_livelock_app
l32i a2, a2, 0
beqi a2, 2, 8f
j 3f
2: movi a2, _lx_intr_livelock_pro
l32i a4, a2, 0
addi a4, a4, 1
s32i a4, a2, 0
movi a2, _lx_intr_livelock_sync
movi a3, 1
addx4 a3, a3, a2
l32i a2, a2, 0
l32i a3, a3, 0
and a2, a2, a3
beqz a2, 5f
j 1b
5: bgei a4, 2, 4f
j 1b
/*
Pro cpu (Core 0) jump bypass, continue waiting, App cpu (Core 1)
can execute to here, unmap itself tg1 1st stage timeout interrupt
then restore registers and exit highint5/4.
*/
3: intr_matrix_map DPORT_APP_MAC_INTR_MAP_REG, ETS_TG1_WDT_LEVEL_INTR_SOURCE, 16
j 9f
/*
Here, App cpu (Core 1) has exited isr, Pro cpu (Core 0) help the
App cpu map tg1 1st stage timeout interrupt clear tg1 interrupt.
*/
4: intr_matrix_map DPORT_APP_MAC_INTR_MAP_REG, ETS_TG1_WDT_LEVEL_INTR_SOURCE, ETS_T1_WDT_INUM
1: movi a2, _lx_intr_livelock_sync
movi a4, 1
addx4 a3, a4, a2
l32i a2, a2, 0
l32i a3, a3, 0
and a2, a2, a3
beqz a2, 1b /* Wait for App cpu to enter highint5/4 again */
wdt_clr_intr_status TIMERG1
j 9f
/* Feed watchdog */
8: wdt_feed TIMERG1
9: wsr a0, PS /* restore interrupt level */
movi a0, 0
beqz a5, 1f
movi a2, _lx_intr_livelock_app
l32i a3, a2, 0
bnei a3, 2, 1f
s32i a0, a2, 0
1: bnez a5, 2f
movi a2, _lx_intr_livelock_pro
s32i a0, a2, 0
2: movi a2, _lx_intr_livelock_sync
addx4 a2, a5, a2
s32i a0, a2, 0
/* Done. Restore registers and return. */
movi a0, LX_INTR_STACK_SIZE
mull a5, a5, a0
movi a0, _lx_intr_stack
add a0, a0, a5
l32i a2, a0, LX_INTR_A2_OFFSET
l32i a3, a0, LX_INTR_A3_OFFSET
l32i a4, a0, LX_INTR_A4_OFFSET
rsync /* ensure register restored */
rsr a5, depc
rsr a0, EXCSAVE_X /* restore a0 */
rfi RFI_X
#endif
/* The linker has no reason to link in this file; all symbols it exports are already defined
(weakly!) in the default int handler. Define a symbol here so we can use it to have the
linker inspect this anyway. */
.global ld_include_highint_hdl
ld_include_highint_hdl:
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