Exception Handler

Handle hardware-generated exceptions. More...

Files
file	exception.c
	Exception Handler.
file	exception.h
	Exception Handler.

Data Structures
struct	reg_block_t
	Structure representing a register block. More...
struct	exception_t
	Structure representing an exception. More...
union	reg_block_t.__unnamed33__
	General purpose registers 1-32. More...
struct	reg_block_t.__unnamed33__.__unnamed35__

Enumerations
enum	{ EXCEPTION_TYPE_UNKNOWN = 0 , EXCEPTION_TYPE_RESET , EXCEPTION_TYPE_CRITICAL , EXCEPTION_TYPE_SYSCALL }
	Exception types. More...
enum	exception_code_t {   EXCEPTION_CODE_INTERRUPT = 0 , EXCEPTION_CODE_TLB_MODIFICATION = 1 , EXCEPTION_CODE_TLB_LOAD_I_MISS = 2 , EXCEPTION_CODE_TLB_STORE_MISS = 3 ,   EXCEPTION_CODE_LOAD_I_ADDRESS_ERROR = 4 , EXCEPTION_CODE_STORE_ADDRESS_ERROR = 5 , EXCEPTION_CODE_I_BUS_ERROR = 6 , EXCEPTION_CODE_D_BUS_ERROR = 7 ,   EXCEPTION_CODE_SYS_CALL = 8 , EXCEPTION_CODE_BREAKPOINT = 9 , EXCEPTION_CODE_RESERVED_INSTRUCTION = 10 , EXCEPTION_CODE_COPROCESSOR_UNUSABLE = 11 ,   EXCEPTION_CODE_ARITHMETIC_OVERFLOW = 12 , EXCEPTION_CODE_TRAP = 13 , EXCEPTION_CODE_FLOATING_POINT = 15 , EXCEPTION_CODE_WATCH = 23 }
	Exception codes.

Detailed Description

Handle hardware-generated exceptions.

The exception handler traps exceptions generated by hardware. This could be an invalid instruction or invalid memory access exception or it could be a reset exception. In both cases, a handler registered with register_exception_handler will be passed information regarding the exception type and relevant registers.

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Data Structure Documentation

reg_block_t

struct reg_block_t

Structure representing a register block.

DO NOT modify the order unless editing inthandler.S

Data Fields
union reg_block_t.__unnamed33__	__unnamed__	General purpose registers 1-32.
uint64_t	hi	HI.
uint64_t	lo	LO.
uint32_t	sr	SR.
uint32_t	cr	CR (NOTE: can't modify this from an exception handler)
uint32_t	epc	represents EPC - COP0 register $14 The coprocessor 0 (system control coprocessor - COP0) register $14 is the return from exception program counter. For asynchronous exceptions it points to the place to continue execution whereas for synchronous (caused by code) exceptions, point to the instruction causing the fault condition, which needs correction in the exception handler. This member is for reading/writing its value.
uint32_t	fc31	FC31.
uint64_t	fpr[32]	Floating point registers 1-32.

exception_t

struct exception_t

Structure representing an exception.

Data Fields
int32_t	type	Exception type. See also EXCEPTION_TYPE_RESET, EXCEPTION_TYPE_CRITICAL
exception_code_t	code	Underlying exception code.
const char *	info	String information of exception.
reg_block_t *	regs	Registers at point of exception.

reg_block_t.__unnamed33__

union reg_block_t.__unnamed33__

General purpose registers 1-32.

Data Fields
uint64_t	gpr[32]
struct reg_block_t.__unnamed33__.__unnamed35__	__unnamed__

reg_block_t.__unnamed33__.__unnamed35__

struct reg_block_t.__unnamed33__.__unnamed35__

Data Fields
uint64_t	zr
uint64_t	at
uint64_t	v0
uint64_t	v1
uint64_t	a0
uint64_t	a1
uint64_t	a2
uint64_t	a3
uint64_t	t0
uint64_t	t1
uint64_t	t2
uint64_t	t3
uint64_t	t4
uint64_t	t5
uint64_t	t6
uint64_t	t7
uint64_t	s0
uint64_t	s1
uint64_t	s2
uint64_t	s3
uint64_t	s4
uint64_t	s5
uint64_t	s6
uint64_t	s7
uint64_t	t8
uint64_t	t9
uint64_t	k0
uint64_t	k1
uint64_t	gp
uint64_t	sp
uint64_t	fp
uint64_t	ra

Enumeration Type Documentation

anonymous enum

anonymous enum

Exception types.

Enumerator
EXCEPTION_TYPE_UNKNOWN	Unknown exception.
EXCEPTION_TYPE_RESET	Reset exception.
EXCEPTION_TYPE_CRITICAL	Critical exception.
EXCEPTION_TYPE_SYSCALL	Syscall exception.