7c3424c244
For now, distinguish alignment, translation and permission faults. The first kind of faults cause the kernel to send SIGBUS to the process causing the fault, the latter two are forwarded to `vm' as pagefaults. Previously, any data abort was forwarded to `vm' as a pagefault, resulting in hard to debug issue #104. Any unhandled fault status results in a disaster. This seems better than naively hoping `vm' can do something about it. Change-Id: I526f575bb2681e087e20fd49c5c0846cdd450c31
61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
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#ifndef _ARM_ACONST_H
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#define _ARM_ACONST_H
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#include <machine/interrupt.h>
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#include <machine/memory.h>
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#include <machine/cpu.h>
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#include <arm/armreg.h>
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/* Program stack words and masks. */
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#define INIT_PSR (PSR_USR32_MODE | PSR_F) /* initial psr */
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#define INIT_TASK_PSR (PSR_SVC32_MODE | PSR_F) /* initial psr for tasks */
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/* Exception vector numbers */
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#define RESET_VECTOR 0
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#define UNDEFINED_INST_VECTOR 1
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#define SUPERVISOR_CALL_VECTOR 2
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#define PREFETCH_ABORT_VECTOR 3
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#define DATA_ABORT_VECTOR 4
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#define HYPERVISOR_CALL_VECTOR 5
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#define INTERRUPT_VECTOR 6
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#define FAST_INTERRUPT_VECTOR 7
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/* Known fault status bits */
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#define DFSR_FS_ALIGNMENT_FAULT 0x01
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#define DFSR_FS_TRANSLATION_FAULT_PAGE 0x07
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#define DFSR_FS_TRANSLATION_FAULT_SECTION 0x05
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#define DFSR_FS_PERMISSION_FAULT_PAGE 0x0F
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#define DFSR_FS_PERMISSION_FAULT_SECTION 0x0D
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#define is_alignment_fault(fault_status) \
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((fault_status) == DFSR_FS_ALIGNMENT_FAULT)
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#define is_translation_fault(fault_status) \
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(((fault_status) == DFSR_FS_TRANSLATION_FAULT_PAGE) \
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|| ((fault_status) == DFSR_FS_TRANSLATION_FAULT_SECTION))
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#define is_permission_fault(fault_status) \
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(((fault_status) == DFSR_FS_PERMISSION_FAULT_PAGE) \
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|| ((fault_status) == DFSR_FS_PERMISSION_FAULT_SECTION))
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/*
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* defines how many bytes are reserved at the top of the kernel stack for global
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* information like currently scheduled process or current cpu id
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*/
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#define ARM_STACK_TOP_RESERVED (2 * sizeof(reg_t))
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/* only selected bits are changeable by user e.g.[31:9] and skip the
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* mode bits. It is probably is a better idea to look at the current
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* status to determine if one is allowed to write these values. This
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* might allow debugging of privileged processes
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*/
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#define SET_USR_PSR(rp, npsr) \
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rp->p_reg.psr = ( rp->p_reg.psr & 0x1F) | ( npsr & ~0x1F)
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#define PG_ALLOCATEME ((phys_bytes)-1)
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#endif /* _ARM_ACONST_H */
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