The registered signal handler can return two states:
1.ContinueType:Search
Continue searching for the next registered signal handler.
2.ContinueType::Execution
Continue to execute the instruction that caused the exception.
If the exception is not handled on the handler chain (all return
ContinueType:Search), the default handler will inject panic, and we can catch
unwind.
config.xml:
`<HeapMaxSize>0x80000</HeapMaxSize>`
sample code:
```
use std::alloc;
use std::backtrace::{self, PrintFormat};
use std::panic;
use std::vec::Vec;
use sgx_signal::ContinueType;
use sgx_signal::exception;
use sgx_types::sgx_exception_info_t;
#[no_mangle]
pub extern "C" fn ecall_entry() {
let _ = backtrace::enable_backtrace("enclave.signal.so", PrintFormat::Full);
let handler = {
move |_info: &mut sgx_exception_info_t| {
ContinueType::Search
}
};
alloc::set_alloc_error_hook(|layout| {
println!("memory allocation of {} bytes failed", layout.size());
unsafe { std::intrinsics::abort() };
});
let _h = exception::register_exception(true, handler);
panic::catch_unwind(|| {
test_alloc_memory()
}).ok();
let mut success = vec![0_u8; 0x20000];
success[0] = 1;
}
#[no_mangle]
#[inline(never)]
fn test_alloc_memory() {
let _failed = vec![0_u8; 0x100000];
}
```
@reuvenpo hope it can help you.
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