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Merge pull request #3443 from adv-sw/main

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Fixes (indirectly) #3419 by providing debugger with ability to resolve sandbox pointers
This commit is contained in:
Chris Fallin
2021-10-11 13:37:04 -07:00
committed by GitHub
parent 5c2a629871 4975bf8b62
commit 783bb1f759
1 changed files with 13 additions and 0 deletions
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13
crates/runtime/src/debug_builtins.rs
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@@ -6,6 +6,18 @@ use wasmtime_environ::{EntityRef, MemoryIndex};
static mut VMCTX_AND_MEMORY: (*mut VMContext, usize) = (std::ptr::null_mut(), 0);
#[no_mangle]
pub unsafe extern "C" fn resolve_vmctx_memory(ptr: usize) -> *const u8 {
let handle = InstanceHandle::from_vmctx(VMCTX_AND_MEMORY.0);
assert!(
VMCTX_AND_MEMORY.1 < handle.module().memory_plans.len(),
"memory index for debugger is out of bounds"
);
let index = MemoryIndex::new(VMCTX_AND_MEMORY.1);
let mem = handle.instance().get_memory(index);
mem.base.add(ptr)
}
#[no_mangle]
pub unsafe extern "C" fn resolve_vmctx_memory_ptr(p: *const u32) -> *const u8 {
let ptr = std::ptr::read(p);
@@ -36,5 +48,6 @@ pub fn ensure_exported() {
unsafe {
std::ptr::read_volatile(resolve_vmctx_memory_ptr as *const u8);
std::ptr::read_volatile(set_vmctx_memory as *const u8);
std::ptr::read_volatile(resolve_vmctx_memory as *const u8);
}
}