ExceptionFrame Struct Reference

Full RISC-V trap context frame. More...

Data Fields
uint32_t	ra
uint32_t	t0
uint32_t	t1
uint32_t	t2
uint32_t	a0
uint32_t	a1
uint32_t	a2
uint32_t	a3
uint32_t	a4
uint32_t	a5
uint32_t	a6
uint32_t	a7
uint32_t	t3
uint32_t	t4
uint32_t	t5
uint32_t	t6
uint32_t	s0
uint32_t	s1
uint32_t	s2
uint32_t	s3
uint32_t	s4
uint32_t	s5
uint32_t	s6
uint32_t	s7
uint32_t	s8
uint32_t	s9
uint32_t	s10
uint32_t	s11
uint32_t	mepc
uint32_t	mstatus
uint32_t	_pad [2]
uint32_t	r0123 [4]
uint32_t	r12
void(*	lr )(void)
void *	pc
uint32_t	xpsr

Detailed Description

Full RISC-V trap context frame.

Exception frame without FPU context saved.

Saved on the thread stack by every trap entry (timer ISR, exception handler) and restored on trap exit. When a context switch swaps SP between save and restore, the restore operates on the new thread's frame, launching it transparently.

Initial thread stacks are populated with this same layout by os_thread_populate_stack().

Field Documentation

_pad

uint32_t ExceptionFrame::_pad[2]

a0

uint32_t ExceptionFrame::a0

a1

uint32_t ExceptionFrame::a1

a2

uint32_t ExceptionFrame::a2

a3

uint32_t ExceptionFrame::a3

a4

uint32_t ExceptionFrame::a4

a5

uint32_t ExceptionFrame::a5

a6

uint32_t ExceptionFrame::a6

a7

uint32_t ExceptionFrame::a7

lr

void(* ExceptionFrame::lr) (void)

mepc

uint32_t ExceptionFrame::mepc

mstatus

uint32_t ExceptionFrame::mstatus

pc

void* ExceptionFrame::pc

r0123

uint32_t ExceptionFrame::r0123[4]

r12

uint32_t ExceptionFrame::r12

ra

uint32_t ExceptionFrame::ra

s0

uint32_t ExceptionFrame::s0

s1

uint32_t ExceptionFrame::s1

s10

uint32_t ExceptionFrame::s10

s11

uint32_t ExceptionFrame::s11

s2

uint32_t ExceptionFrame::s2

s3

uint32_t ExceptionFrame::s3

s4

uint32_t ExceptionFrame::s4

s5

uint32_t ExceptionFrame::s5

s6

uint32_t ExceptionFrame::s6

s7

uint32_t ExceptionFrame::s7

s8

uint32_t ExceptionFrame::s8

s9

uint32_t ExceptionFrame::s9

t0

uint32_t ExceptionFrame::t0

t1

uint32_t ExceptionFrame::t1

t2

uint32_t ExceptionFrame::t2

t3

uint32_t ExceptionFrame::t3

t4

uint32_t ExceptionFrame::t4

t5

uint32_t ExceptionFrame::t5

t6

uint32_t ExceptionFrame::t6

xpsr

uint32_t ExceptionFrame::xpsr