256 lines
5.5 KiB
ArmAsm
256 lines
5.5 KiB
ArmAsm
/*
|
|
* Copyright (c) 2014 Wind River Systems, Inc.
|
|
* Copyright (c) 2018 Synopsys.
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* @brief Fault handlers for ARCv2
|
|
*
|
|
* Fault handlers for ARCv2 processors.
|
|
*/
|
|
|
|
#include <toolchain.h>
|
|
#include <linker/sections.h>
|
|
#include <arch/cpu.h>
|
|
#include <swap_macros.h>
|
|
|
|
GTEXT(_Fault)
|
|
GTEXT(_do_kernel_oops)
|
|
GTEXT(__reset)
|
|
GTEXT(__memory_error)
|
|
GTEXT(__instruction_error)
|
|
GTEXT(__ev_machine_check)
|
|
GTEXT(__ev_tlb_miss_i)
|
|
GTEXT(__ev_tlb_miss_d)
|
|
GTEXT(__ev_prot_v)
|
|
GTEXT(__ev_privilege_v)
|
|
GTEXT(__ev_swi)
|
|
GTEXT(__ev_trap)
|
|
GTEXT(__ev_extension)
|
|
GTEXT(__ev_div_zero)
|
|
GTEXT(__ev_dc_error)
|
|
GTEXT(__ev_maligned)
|
|
|
|
GDATA(exc_nest_count)
|
|
|
|
/*
|
|
* @brief Fault handler installed in the fault and reserved vectors
|
|
*/
|
|
|
|
SECTION_SUBSEC_FUNC(TEXT,__fault,__memory_error)
|
|
SECTION_SUBSEC_FUNC(TEXT,__fault,__instruction_error)
|
|
SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_machine_check)
|
|
SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_tlb_miss_i)
|
|
SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_tlb_miss_d)
|
|
SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_prot_v)
|
|
SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_privilege_v)
|
|
SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_swi)
|
|
SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_extension)
|
|
SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_div_zero)
|
|
SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_dc_error)
|
|
SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_maligned)
|
|
|
|
/*
|
|
* Before invoking exception handler, the kernel switches to an exception
|
|
* stack, to save the faulting thread's registers.
|
|
* The exception is fatal and all the kernel can do is just print
|
|
* a diagnostic message and halt.
|
|
*/
|
|
|
|
#ifdef CONFIG_ARC_STACK_CHECKING
|
|
push_s r2
|
|
/* disable stack checking */
|
|
lr r2, [_ARC_V2_STATUS32]
|
|
bclr r2, r2, _ARC_V2_STATUS32_SC_BIT
|
|
kflag r2
|
|
pop_s r2
|
|
#endif
|
|
|
|
/* save caller saved registers */
|
|
_create_irq_stack_frame
|
|
|
|
#ifdef CONFIG_ARC_HAS_SECURE
|
|
lr r0,[_ARC_V2_ERSEC_STAT]
|
|
st_s r0, [sp, ___isf_t_sec_stat_OFFSET]
|
|
#endif
|
|
lr r0,[_ARC_V2_ERSTATUS]
|
|
st_s r0, [sp, ___isf_t_status32_OFFSET]
|
|
lr r0,[_ARC_V2_ERET]
|
|
st_s r0, [sp, ___isf_t_pc_OFFSET] /* eret into pc */
|
|
|
|
ld r1, [exc_nest_count]
|
|
add r0, r1, 1
|
|
st r0, [exc_nest_count]
|
|
cmp r1, 0
|
|
|
|
bgt.d exc_nest_handle
|
|
mov r0, sp
|
|
|
|
mov r1, _kernel
|
|
ld sp, [r1, _kernel_offset_to_irq_stack]
|
|
exc_nest_handle:
|
|
push_s r0
|
|
|
|
jl _Fault
|
|
|
|
_exc_return:
|
|
pop sp
|
|
|
|
mov r1, exc_nest_count
|
|
ld r0, [r1]
|
|
sub r0, r0, 1
|
|
cmp r0, 0
|
|
bne.d _exc_return_from_exc
|
|
st r0, [r1]
|
|
|
|
#ifdef CONFIG_PREEMPT_ENABLED
|
|
mov_s r1, _kernel
|
|
ld_s r2, [r1, _kernel_offset_to_current]
|
|
|
|
/* check if the current thread needs to be rescheduled */
|
|
ld_s r0, [r1, _kernel_offset_to_ready_q_cache]
|
|
breq r0, r2, _exc_return_from_exc
|
|
|
|
_save_callee_saved_regs
|
|
|
|
st _CAUSE_RIRQ, [r2, _thread_offset_to_relinquish_cause]
|
|
/* note: Ok to use _CAUSE_RIRQ since everything is saved */
|
|
|
|
ld_s r2, [r1, _kernel_offset_to_ready_q_cache]
|
|
st_s r2, [r1, _kernel_offset_to_current]
|
|
|
|
#ifdef CONFIG_ARC_HAS_SECURE
|
|
/*
|
|
* sync up the ERSEC_STAT.ERM and SEC_STAT.IRM.
|
|
* use a fake interrupt return to simulate an exception turn.
|
|
* ERM and IRM record which mode the cpu should return, 1: secure
|
|
* 0: normal
|
|
*/
|
|
lr r3,[_ARC_V2_ERSEC_STAT]
|
|
btst r3, 31
|
|
bset.nz r3, r3, 3
|
|
bclr.z r3, r3, 3
|
|
/* sflag r3 */
|
|
/* sflag instruction is not supported in current ARC GNU */
|
|
.long 0x00ff302f
|
|
#endif
|
|
/* clear AE bit to forget this was an exception */
|
|
lr r3, [_ARC_V2_STATUS32]
|
|
and r3,r3,(~_ARC_V2_STATUS32_AE)
|
|
kflag r3
|
|
/* pretend lowest priority interrupt happened to use common handler */
|
|
lr r3, [_ARC_V2_AUX_IRQ_ACT]
|
|
or r3,r3,(1<<(CONFIG_NUM_IRQ_PRIO_LEVELS-1)) /* use lowest */
|
|
sr r3, [_ARC_V2_AUX_IRQ_ACT]
|
|
|
|
/* Assumption: r2 has current thread */
|
|
b _rirq_common_interrupt_swap
|
|
#endif
|
|
|
|
_exc_return_from_exc:
|
|
_pop_irq_stack_frame
|
|
rtie
|
|
|
|
|
|
#ifdef CONFIG_IRQ_OFFLOAD
|
|
GTEXT(_irq_do_offload);
|
|
#endif
|
|
|
|
|
|
SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_trap)
|
|
/* get the id of trap_s */
|
|
lr ilink, [_ARC_V2_ECR]
|
|
and ilink, ilink, 0x3f
|
|
#ifdef CONFIG_USERSPACE
|
|
cmp ilink, _TRAP_S_CALL_SYSTEM_CALL
|
|
bne _do_other_trap
|
|
/* do sys_call */
|
|
mov ilink, _SYSCALL_LIMIT
|
|
cmp r6, ilink
|
|
blt valid_syscall_id
|
|
|
|
mov r0, r6
|
|
mov r6, _SYSCALL_BAD
|
|
|
|
valid_syscall_id:
|
|
#ifdef CONFIG_ARC_HAS_SECURE
|
|
lr ilink, [_ARC_V2_ERSEC_STAT]
|
|
push ilink
|
|
#endif
|
|
lr ilink, [_ARC_V2_ERET]
|
|
push ilink
|
|
lr ilink, [_ARC_V2_ERSTATUS]
|
|
push ilink
|
|
|
|
|
|
bclr ilink, ilink, _ARC_V2_STATUS32_U_BIT
|
|
sr ilink, [_ARC_V2_ERSTATUS]
|
|
|
|
mov ilink, _arc_do_syscall
|
|
sr ilink, [_ARC_V2_ERET]
|
|
|
|
rtie
|
|
|
|
/*
|
|
* Before invoking exception handler, the kernel switches to an exception
|
|
* stack to save the faulting thread's registers.
|
|
* The exception is fatal and all the kernel can do is just print
|
|
* a diagnostic message and halt.
|
|
*/
|
|
|
|
_do_other_trap:
|
|
#endif /* CONFIG_USERSPACE */
|
|
#ifdef CONFIG_ARC_STACK_CHECKING
|
|
push_s r2
|
|
/* disable stack checking */
|
|
lr r2, [_ARC_V2_STATUS32]
|
|
bclr r2, r2, _ARC_V2_STATUS32_SC_BIT
|
|
kflag r2
|
|
pop_s r2
|
|
#endif
|
|
|
|
/* save caller saved registers */
|
|
_create_irq_stack_frame
|
|
|
|
#ifdef CONFIG_ARC_HAS_SECURE
|
|
lr r0,[_ARC_V2_ERSEC_STAT]
|
|
st_s r0, [sp, ___isf_t_sec_stat_OFFSET]
|
|
#endif
|
|
lr r0,[_ARC_V2_ERSTATUS]
|
|
st_s r0, [sp, ___isf_t_status32_OFFSET]
|
|
lr r0,[_ARC_V2_ERET]
|
|
st_s r0, [sp, ___isf_t_pc_OFFSET] /* eret into pc */
|
|
|
|
ld r1, [exc_nest_count]
|
|
add r0, r1, 1
|
|
st r0, [exc_nest_count]
|
|
cmp r1, 0
|
|
|
|
bgt.d trap_nest_handle
|
|
mov r0, sp
|
|
|
|
mov r1, _kernel
|
|
ld sp, [r1, _kernel_offset_to_irq_stack]
|
|
trap_nest_handle:
|
|
push_s r0
|
|
|
|
mov blink, _exc_return
|
|
|
|
cmp ilink, _TRAP_S_CALL_RUNTIME_EXCEPT
|
|
beq _oops
|
|
|
|
#ifdef CONFIG_IRQ_OFFLOAD
|
|
cmp ilink, _TRAP_S_SCALL_IRQ_OFFLOAD
|
|
bne _trap_fault
|
|
j _irq_do_offload
|
|
#endif
|
|
|
|
_trap_fault:
|
|
j _Fault
|
|
|
|
_oops:
|
|
j _do_kernel_oops
|