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March 15, 2019 09:53
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; rdi = vmctx | |
mov [rsp + 0x20], rdi | |
; eax = callee_idx | |
mov eax, 0 | |
mov [rsp + 0x34], eax | |
mov rax, [rsp + 0x20] | |
; eax = vmctx->tables[table_idx].len | |
mov eax, [rax + 0x68] | |
; ecx = callee_idx | |
mov ecx, [rsp + 0x34] | |
; vmctx->tables[table_idx].len is `vmctx_vmtable_definition_current_elements(table_idx)` in | |
; `VMOffsets` | |
; if (callee_idx < vmctx->tables[table_idx].len) goto .Lcont0 | |
cmp ecx, eax | |
jb .Lcont0 | |
ud2 | |
.Lcont0: | |
; eax = callee_idx | |
mov eax, [rsp + 0x34] | |
mov eax, eax | |
; rcx = vmctx | |
mov rcx, [rsp + 0x20] | |
; vmctx->tables[table_idx].base is `vmctx_vmtable_definition_base(table_idx)` in | |
; `VMOffsets` | |
; rcx = vmctx->tables[table_idx].base | |
mov rcx, [rcx + 0x60] | |
mov edx, 0x18 | |
; rax = callee_idx * sizeof(VMTableEntry) | |
imul rax, rdx | |
mov [rsp + 0x18], rax | |
; rax = vmctx | |
mov rax, [rsp + 0x20] | |
; `signature_ids` maps local type ids to global type ids | |
; `vmctx->signature_ids[signature_idx]` is `vmctx_vmshared_signature_id(signature_idx)` | |
; eax = vmctx->signature_ids[signature_idx] | |
mov eax, [rax] | |
mov [rsp + 0x30], eax | |
; rax = callee_idx * sizeof(VMCallerCheckedAnyFunc) | |
mov rax, [rsp + 0x18] | |
; `(vmctx->tables[table_idx].base)[callee_idx].type_index` is `vmctx_vmtable_definition_base(table_idx) + | |
; callee_idx * size_of_vmcaller_checked_anyfunc + vmcaller_checked_anyfunc_type_index` in `VMOffsets` | |
; eax = (vmctx->tables[table_idx].base)[callee_idx].type_index | |
mov eax, [rcx + rax + 8] | |
; edx = vmctx->signature_ids[signature_idx] | |
mov edx, [rsp + 0x30] | |
; if ((vmctx->tables[table_idx].base)[callee_idx].type_index == vmctx->signature_ids[signature_idx]) | |
; goto .Lcont1 | |
cmp eax, edx | |
je .Lcont1 | |
ud2 | |
.Lcont1: | |
; rax = callee_idx * sizeof(VMTableEntry) | |
mov rax, [rsp + 0x18] | |
; `(vmctx->tables[table_idx].base)[callee_idx].func_ptr` is `vmctx_vmtable_definition_base(table_idx) + | |
; callee_idx * size_of_vmcaller_checked_anyfunc + vmcaller_checked_anyfunc_func_ptr` in `VMOffsets` | |
; rax = (vmctx->tables[table_idx].base)[callee_idx].func_ptr | |
mov rax, [rcx + rax] | |
; rdx = callee_idx * 0x18 | |
mov rdx, [rsp + 0x18] | |
; `(vmctx->tables[table_idx].base)[callee_idx].vmctx` is `vmctx_vmtable_definition_base(table_idx) + | |
; callee_idx * size_of_vmcaller_checked_anyfunc + vmcaller_checked_anyfunc_vmctx` in `VMOffsets` | |
; rcx = (vmctx->tables[table_idx].base)[callee_idx].vmctx | |
mov rcx, [rcx + rdx + 0x10] | |
mov rdi, rcx | |
call rax |
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