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xtensa: use highest available EPC/EPS regs in restore context

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There may be Xtensa SoCs which don't have high enough interrupt
levels for EPC6/EPS6 to exist in _restore_context. So changes
these to those which should be available according to the ISA
config file.

Fixes #30126

Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This commit is contained in:
Daniel Leung 2020-12-11 13:55:00 -08:00 • committed by Andrew Boie
commit 0d7bdbc876
2 changed files with 13 additions and 4 deletions
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11
arch/xtensa/core/xtensa-asm2-util.S
View file

@ -5,6 +5,7 @@
*/
#include <xtensa-asm2-s.h>
#include <offsets.h>
#include <toolchain.h>
/*
* xtensa_spill_reg_windows
@ -145,14 +146,18 @@ _high_restore_done:
* should test to be able to support hardware with less than 6 levels,
* though...
*/
#define RCTX_EPC_REG _CONCAT(EPC, XCHAL_NUM_INTLEVELS)
#define RCTX_EPS_REG _CONCAT(EPS, XCHAL_NUM_INTLEVELS)
.global _restore_context
_restore_context:
call0 xtensa_restore_high_regs
l32i a0, a1, BSA_PC_OFF
wsr.EPC6 a0
wsr.RCTX_EPC_REG a0
l32i a0, a1, BSA_PS_OFF
wsr.EPS6 a0
wsr.RCTX_EPS_REG a0
l32i a0, a1, BSA_SAR_OFF
wsr.SAR a0
@ -179,7 +184,7 @@ _restore_context:
l32i a3, a1, BSA_A3_OFF
addi a1, a1, BASE_SAVE_AREA_SIZE
rfi 6
rfi XCHAL_NUM_INTLEVELS
/*
* void xtensa_switch(void *new, void **old_return);

6
arch/xtensa/core/xtensa-asm2.c
View file

@ -11,6 +11,7 @@
#include <kernel_internal.h>
#include <kswap.h>
#include <_soc_inthandlers.h>
#include <toolchain.h>
#include <logging/log.h>
LOG_MODULE_DECLARE(os, CONFIG_KERNEL_LOG_LEVEL);
@ -136,9 +137,12 @@ static inline unsigned int get_bits(int offset, int num_bits, unsigned int val)
/* The wrapper code lives here instead of in the python script that
* generates _xtensa_handle_one_int*(). Seems cleaner, still kind of
* ugly.
*
* This may be unused depending on number of interrupt levels
* supported by the SoC.
*/
#define DEF_INT_C_HANDLER(l) \
void *xtensa_int##l##_c(void *interrupted_stack) \
__unused void *xtensa_int##l##_c(void *interrupted_stack) \
{ \
uint32_t irqs, intenable, m; \
__asm__ volatile("rsr.interrupt %0" : "=r"(irqs)); \