interupt disabled in ISR

thank u for the answer David_Cai.

This is the code of alt_irq_entry.S:

/*

* This is the interrupt exception entry point code, which saves all the

* registers and calls the interrupt handler. It should be pulled in using

* a .globl from alt_irq_register.c. This scheme is used so that if an

* interrupt is never registered, then this code will not appear in the

* generated executable, thereby improving code footprint.

*/

/*

* Explicitly allow the use of r1 (the assembler temporary register)

* within this code. This register is normally reserved for the use of

* the compiler.

*/

.set noat

/*

* Pull in the exception handler register save code.

*/

.globl alt_exception

.globl alt_irq_entry

.section .exceptions.entry.label, "xa"

alt_irq_entry:

/*

* Section .exceptions.entry is in alt_exception_entry.S

* This saves all the caller saved registers and reads estatus into r5

*/

.section .exceptions.irqtest, "xa"

# ifdef ALT_CI_EXCEPTION_VECTOR_N

/*

* Use the exception vector custom instruction if present to accelerate

* this code.

* If the exception vector custom instruction returns a negative

* value, there are no interrupts active (estatus.pie is 0

* or ipending is 0) so assume it is a software exception.

*/

custom ALT_CI_EXCEPTION_VECTOR_N, et, r0, r0

blt et, r0, .Lnot_irq# else

/*

* Test to see if the exception was a software exception or caused

* by an external interrupt, and vector accordingly.

*/

rdctl r4, ipending

andi r2, r5, 1

beq r2, zero, .Lnot_irq

beq r4, zero, .Lnot_irq# endif /* ALT_CI_EXCEPTION_VECTOR_N */

.section .exceptions.irqhandler, "xa"

/*

* Now that all necessary registers have been preserved, call

* alt_irq_handler() to process the interrupts.

*/

call alt_irq_handler

.section .exceptions.irqreturn, "xa"

br .Lexception_exit

.section .exceptions.notirq.label, "xa"

.Lnot_irq:

/*

* Section .exceptions.exit is in alt_exception_entry.S

* This restores all the caller saved registers

*/

.section .exceptions.exit.label

.Lexception_exit:

Which are the instruction that save registers and clears PIE bit?

Probably I miss something.

Thank u