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Unmap stack after call.

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This commit is contained in:
losfair
2019-11-20 01:27:48 +08:00
parent 85b1935366
commit 98052f82b9
1 changed files with 6 additions and 4 deletions
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10
lib/singlepass-backend/src/codegen_x64.rs
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@ -426,10 +426,10 @@ impl RunnableModule for X64ExecutionContext {
callable: func, callable: func,
}; };
use libc::{ use libc::{
mmap, mprotect, MAP_ANON, MAP_NORESERVE, MAP_PRIVATE, PROT_READ, mmap, munmap, MAP_ANON, MAP_NORESERVE, MAP_PRIVATE, PROT_READ,
PROT_WRITE, PROT_WRITE,
}; };
const STACK_SIZE: usize = 1048576 * 1024; // 1GB of virtual addrss space for stack. const STACK_SIZE: usize = 1048576 * 1024; // 1GB of virtual address space for stack.
let stack_ptr = unsafe { let stack_ptr = unsafe {
mmap( mmap(
::std::ptr::null_mut(), ::std::ptr::null_mut(),
@ -444,11 +444,13 @@ impl RunnableModule for X64ExecutionContext {
panic!("unable to allocate stack"); panic!("unable to allocate stack");
} }
// TODO: Mark specific regions in the stack as PROT_NONE. // TODO: Mark specific regions in the stack as PROT_NONE.
SWITCH_STACK( let ret = SWITCH_STACK(
(stack_ptr as *mut u8).offset(STACK_SIZE as isize) as *mut u64, (stack_ptr as *mut u8).offset(STACK_SIZE as isize) as *mut u64,
call_fn, call_fn,
&mut cctx as *mut CallCtx as *mut u8, &mut cctx as *mut CallCtx as *mut u8,
) );
munmap(stack_ptr, STACK_SIZE);
ret
} }
}, },
Some(execution_context.breakpoints.clone()), Some(execution_context.breakpoints.clone()),