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arch: arc: fix the bug that interrupt stack is not switched

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For the old codes, if nest interrupts come out after _isr_wrapper
and before _check_nest_int_by_irq_act, then multi-bits in irq_act
will be set, this will result irq stack will not be switched in
correctly

As a fix, it's still need to use nest interrupt counter to do
interrupt stack switch as before

The difference is in the past exc_nest_count is used, but here
_kernel.nested/_kernel.cpus[cpu_id].nested is used.

Signed-off-by: Wayne Ren <wei.ren@synopsys.com>
This commit is contained in:
Wayne Ren 2019-08-14 00:45:13 +08:00 • committed by Ioannis Glaropoulos
commit 44c917e6b2
4 changed files with 51 additions and 5 deletions
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4
arch/arc/core/fast_irq.S
View file

@ -76,7 +76,8 @@ SECTION_FUNC(TEXT, _firq_enter)
lr r25, [_ARC_V2_LP_END]
#endif
_check_nest_int_by_irq_act r0, r1
/* check whether irq stack is used */
_check_and_inc_int_nest_counter r0, r1
bne.d firq_nest
mov r0, sp
@ -138,6 +139,7 @@ SECTION_FUNC(TEXT, _firq_exit)
sr r24, [_ARC_V2_LP_START]
sr r25, [_ARC_V2_LP_END]
#endif
_dec_int_nest_counter r0, r1
_check_nest_int_by_irq_act r0, r1

8
arch/arc/core/fault_s.S
View file

@ -246,9 +246,9 @@ _do_non_syscall_trap:
st_s r0, [sp, ___isf_t_pc_OFFSET] /* eret into pc */
lr r0, [_ARC_V2_AUX_IRQ_ACT]
and r0, r0, 0xffff
cmp r0, 0
/* check whether irq stack is used */
_check_and_inc_int_nest_counter r0, r1
bne.d exc_nest_handle
mov r0, sp
@ -260,6 +260,8 @@ exc_nest_handle:
pop sp
_dec_int_nest_counter r0, r1
lr r0, [_ARC_V2_AUX_IRQ_ACT]
and r0, r0, 0xffff
cmp r0, 0

5
arch/arc/core/regular_irq.S
View file

@ -67,7 +67,8 @@ SECTION_FUNC(TEXT, _rirq_enter)
#endif
clri
_check_nest_int_by_irq_act r0, r1
/* check whether irq stack is used */
_check_and_inc_int_nest_counter r0, r1
bne.d rirq_nest
mov r0, sp
@ -92,6 +93,8 @@ SECTION_FUNC(TEXT, _rirq_exit)
pop sp
_dec_int_nest_counter r0, r1
_check_nest_int_by_irq_act r0, r1
jne _rirq_no_reschedule

39
arch/arc/include/swap_macros.h
View file

@ -294,6 +294,45 @@
#endif /* CONFIG_ARC_SECURE_FIRMWARE */
.endm
/* check and increase the interrupt nest counter
* after increase, check whether nest counter == 1
* the result will be EQ bit of status32
*/
.macro _check_and_inc_int_nest_counter reg1 reg2
#ifdef CONFIG_SMP
_get_cpu_id \reg1
ld.as \reg1, [@_curr_cpu, \reg1]
ld \reg2, [\reg1, ___cpu_t_nested_OFFSET]
#else
mov \reg1, _kernel
ld \reg2, [\reg1, ___kernel_t_nested_OFFSET]
#endif
add \reg2, \reg2, 1
#ifdef CONFIG_SMP
st \reg2, [\reg1, ___cpu_t_nested_OFFSET]
#else
st \reg2, [\reg1, ___kernel_t_nested_OFFSET]
#endif
cmp \reg2, 1
.endm
/* decrease interrupt nest counter */
.macro _dec_int_nest_counter reg1 reg2
#ifdef CONFIG_SMP
_get_cpu_id \reg1
ld.as \reg1, [@_curr_cpu, \reg1]
ld \reg2, [\reg1, ___cpu_t_nested_OFFSET]
#else
mov \reg1, _kernel
ld \reg2, [\reg1, ___kernel_t_nested_OFFSET]
#endif
sub \reg2, \reg2, 1
#ifdef CONFIG_SMP
st \reg2, [\reg1, ___cpu_t_nested_OFFSET]
#else
st \reg2, [\reg1, ___kernel_t_nested_OFFSET]
#endif
.endm
/* If multi bits in IRQ_ACT are set, i.e. last bit != fist bit, it's
* in nest interrupt. The result will be EQ bit of status32