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Add interrupt exit support to interrupt_handler

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interrupt_handler: preserve registers and load them after $name2 fn
interrupt_handler: allow $name2 fn to return
This commit is contained in:
morgan 2023-11-14 15:01:27 +08:00
parent be672ab662
commit 40b3d2e057
1 changed files with 13 additions and 4 deletions
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17
libcortex_a9/src/lib.rs
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@ -36,7 +36,9 @@ pub fn notify_spin_lock() {
}
#[macro_export]
/// Interrupt handler, which setup the stack and jump to actual interrupt handler.
/// Interrupt handler, which setup the stack and preserve registers before jumping to actual interrupt handler.
/// Registers r0-r12, PC, SP and CPSR are restored after the actual handler.
///
/// - `name` is the name of the interrupt, should be the same as the one defined in vector table.
/// - `name2` is the name for the actual handler, should be different from name.
/// - `stack0` is the stack for the interrupt handler when called from core0.
@ -44,8 +46,7 @@ pub fn notify_spin_lock() {
/// - `body` is the body of the actual interrupt handler, should be a normal unsafe rust function
/// body.
///
/// Note that the interrupt handler would use the same stack as normal programs by default, so
/// interrupt handlers should not return to normal program or it may corrupt the stack.
/// Note that the interrupt handler would use the same stack as normal programs by default.
macro_rules! interrupt_handler {
($name:ident, $name2:ident, $stack0:ident, $stack1:ident, $body:block) => {
#[link_section = ".text.boot"]
@ -54,19 +55,27 @@ macro_rules! interrupt_handler {
pub unsafe extern "C" fn $name() -> ! {
asm!(
// setup SP, depending on CPU 0 or 1
// and preserve registers
"SUB lr, lr, #4",
"STMFD sp!, {{r0-r12, lr}}",
"mrc p15, #0, r0, c0, c0, #5",
concat!("movw r1, :lower16:", stringify!($stack0)),
concat!("movt r1, :upper16:", stringify!($stack0)),
"tst r0, #3",
concat!("movwne r1, :lower16:", stringify!($stack1)),
concat!("movtne r1, :upper16:", stringify!($stack1)),
"mov r0, sp",
"mov sp, r1",
"push {{r0, r1}}", // for stack alignment
concat!("bl ", stringify!($name2)),
"pop {{r0, r1}}",
"mov sp, r0",
"LDMFD sp!, {{r0-r12, pc}}^", // caret ^ : copy SPSR to the CPSR
options(noreturn)
);
}
#[no_mangle]
pub unsafe extern "C" fn $name2() -> ! $body
pub unsafe extern "C" fn $name2() $body
};
}