622 lines
26 KiB
Plaintext
622 lines
26 KiB
Plaintext
(*
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* Copyright 2014, General Dynamics C4 Systems
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*)
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(*
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Decoding system calls
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*)
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chapter "Decoding System Calls"
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theory Decode_A
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imports
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Interrupt_A
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ArchDecode_A
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"ExecSpec.InvocationLabels_H"
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begin
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context begin interpretation Arch .
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requalify_consts
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ArchDefaultExtraRegisters
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check_valid_ipc_buffer
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is_valid_vtable_root
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arch_decode_irq_control_invocation
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arch_data_to_obj_type
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arch_decode_invocation
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arch_check_irq
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end
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text \<open>
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This theory includes definitions describing how user arguments are
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decoded into invocation structures; these structures are then used
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to perform the actual system call (see @{text "perform_invocation"}).
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In addition, these definitions check the validity of these arguments,
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throwing an error if given an invalid request.
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As such, this theory describes the binary interface between the
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user and the kernel, along with the preconditions on each argument.
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\<close>
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section "CNode"
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text \<open>This definition decodes CNode invocations.\<close>
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definition
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decode_cnode_invocation ::
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"data \<Rightarrow> data list \<Rightarrow> cap \<Rightarrow> cap list \<Rightarrow> (cnode_invocation,'z::state_ext) se_monad"
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where
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"decode_cnode_invocation label args cap excaps \<equiv> doE
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unlessE (gen_invocation_type label \<in> set [CNodeRevoke .e. CNodeSaveCaller]) $
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throwError IllegalOperation;
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whenE (length args < 2) (throwError TruncatedMessage);
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index \<leftarrow> returnOk $ data_to_cptr $ args ! 0;
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bits \<leftarrow> returnOk $ data_to_nat $ args ! 1;
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args \<leftarrow> returnOk $ drop 2 args;
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dest_slot \<leftarrow> lookup_target_slot cap index bits;
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if length args \<ge> 2 \<and> length excaps > 0
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\<and> gen_invocation_type label \<in> set [CNodeCopy .e. CNodeMutate] then
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doE
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src_index \<leftarrow> returnOk $ data_to_cptr $ args ! 0;
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src_depth \<leftarrow> returnOk $ data_to_nat $ args ! 1;
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args \<leftarrow> returnOk $ drop 2 args;
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src_root_cap \<leftarrow> returnOk $ excaps ! 0;
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ensure_empty dest_slot;
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src_slot \<leftarrow>
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lookup_source_slot src_root_cap src_index src_depth;
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src_cap \<leftarrow> liftE $ get_cap src_slot;
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whenE (src_cap = NullCap) $
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throwError $ FailedLookup True $ MissingCapability src_depth;
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(rights, cap_data, is_move) \<leftarrow> case (gen_invocation_type label, args) of
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(CNodeCopy, rightsWord # _) \<Rightarrow> doE
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rights \<leftarrow> returnOk $ data_to_rights $ rightsWord;
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returnOk $ (rights, None, False)
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odE
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| (CNodeMint, rightsWord # capData # _) \<Rightarrow> doE
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rights \<leftarrow> returnOk $ data_to_rights $ rightsWord;
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returnOk $ (rights, Some capData, False)
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odE
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| (CNodeMove, _) \<Rightarrow> returnOk (all_rights, None, True)
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| (CNodeMutate, capData # _) \<Rightarrow> returnOk (all_rights, Some capData, True)
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| _ \<Rightarrow> throwError TruncatedMessage;
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src_cap \<leftarrow> returnOk $ mask_cap rights src_cap;
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new_cap \<leftarrow> (if is_move then returnOk else derive_cap src_slot) (case cap_data of
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Some w \<Rightarrow> update_cap_data is_move w src_cap
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| None \<Rightarrow> src_cap);
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whenE (new_cap = NullCap) $ throwError IllegalOperation;
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returnOk $ (if is_move then MoveCall else InsertCall) new_cap src_slot dest_slot
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odE
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else if gen_invocation_type label = CNodeRevoke then returnOk $ RevokeCall dest_slot
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else if gen_invocation_type label = CNodeDelete then returnOk $ DeleteCall dest_slot
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else if gen_invocation_type label = CNodeSaveCaller then doE
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ensure_empty dest_slot;
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returnOk $ SaveCall dest_slot
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odE
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else if gen_invocation_type label = CNodeCancelBadgedSends then doE
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cap \<leftarrow> liftE $ get_cap dest_slot;
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unlessE (has_cancel_send_rights cap) $ throwError IllegalOperation;
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returnOk $ CancelBadgedSendsCall cap
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odE
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else if gen_invocation_type label = CNodeRotate \<and> length args > 5
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\<and> length excaps > 1 then
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doE
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pivot_new_data \<leftarrow> returnOk $ args ! 0;
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pivot_index \<leftarrow> returnOk $ data_to_cptr $ args ! 1;
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pivot_depth \<leftarrow> returnOk $ data_to_nat $ args ! 2;
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src_new_data \<leftarrow> returnOk $ args ! 3;
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src_index \<leftarrow> returnOk $ data_to_cptr $ args ! 4;
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src_depth \<leftarrow> returnOk $ data_to_nat $ args ! 5;
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pivot_root_cap <- returnOk $ excaps ! 0;
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src_root_cap <- returnOk $ excaps ! 1;
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src_slot <- lookup_source_slot src_root_cap src_index src_depth;
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pivot_slot <- lookup_pivot_slot pivot_root_cap pivot_index pivot_depth;
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whenE (pivot_slot = src_slot \<or> pivot_slot = dest_slot) $
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throwError IllegalOperation;
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unlessE (src_slot = dest_slot) $ ensure_empty dest_slot;
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src_cap <- liftE $ get_cap src_slot;
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whenE (src_cap = NullCap) $
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throwError $ FailedLookup True $ MissingCapability src_depth;
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pivot_cap <- liftE $ get_cap pivot_slot;
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whenE (pivot_cap = NullCap) $
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throwError $ FailedLookup False $ MissingCapability pivot_depth;
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new_src_cap \<leftarrow> returnOk $ update_cap_data True src_new_data src_cap;
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new_pivot_cap \<leftarrow> returnOk $ update_cap_data True pivot_new_data pivot_cap;
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whenE (new_src_cap = NullCap) $ throwError IllegalOperation;
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whenE (new_pivot_cap = NullCap) $ throwError IllegalOperation;
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returnOk $ RotateCall new_src_cap new_pivot_cap src_slot pivot_slot dest_slot
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odE
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else
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throwError TruncatedMessage
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odE"
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section "Threads"
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text \<open>The definitions in this section decode invocations
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on TCBs.
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\<close>
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text \<open>This definition checks whether the first argument is
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between the second and third.
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\<close>
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definition
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decode_read_registers :: "data list \<Rightarrow> cap \<Rightarrow> (tcb_invocation,'z::state_ext) se_monad"
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where
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"decode_read_registers data cap \<equiv> case data of
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flags#n#_ \<Rightarrow> doE
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range_check n 1 $ of_nat (length frameRegisters + length gpRegisters);
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p \<leftarrow> case cap of ThreadCap p \<Rightarrow> returnOk p;
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self \<leftarrow> liftE $ gets cur_thread;
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whenE (p = self) $ throwError IllegalOperation;
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returnOk $ ReadRegisters p (flags !! 0) n ArchDefaultExtraRegisters
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odE
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| _ \<Rightarrow> throwError TruncatedMessage"
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definition
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decode_copy_registers :: "data list \<Rightarrow> cap \<Rightarrow> cap list \<Rightarrow> (tcb_invocation,'z::state_ext) se_monad"
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where
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"decode_copy_registers data cap extra_caps \<equiv> case data of
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flags#_ \<Rightarrow> doE
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suspend_source \<leftarrow> returnOk (flags !! 0);
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resume_target \<leftarrow> returnOk (flags !! 1);
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transfer_frame \<leftarrow> returnOk (flags !! 2);
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transfer_integer \<leftarrow> returnOk (flags !! 3);
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whenE (extra_caps = []) $ throwError TruncatedMessage;
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src_tcb \<leftarrow> (case extra_caps of
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ThreadCap p # _ \<Rightarrow> returnOk p
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| _ \<Rightarrow> throwError $ InvalidCapability 1);
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p \<leftarrow> case cap of ThreadCap p \<Rightarrow> returnOk p;
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returnOk $ CopyRegisters p src_tcb
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suspend_source resume_target
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transfer_frame transfer_integer
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ArchDefaultExtraRegisters
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odE
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| _ \<Rightarrow> throwError TruncatedMessage"
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definition
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decode_write_registers :: "data list \<Rightarrow> cap \<Rightarrow> (tcb_invocation,'z::state_ext) se_monad"
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where
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"decode_write_registers data cap \<equiv> case data of
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flags#n#values \<Rightarrow> doE
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whenE (length values < unat n) $ throwError TruncatedMessage;
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p \<leftarrow> case cap of ThreadCap p \<Rightarrow> returnOk p;
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self \<leftarrow> liftE $ gets cur_thread;
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whenE (p = self) $ throwError IllegalOperation;
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returnOk $ WriteRegisters p (flags !! 0)
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(take (unat n) values) ArchDefaultExtraRegisters
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odE
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| _ \<Rightarrow> throwError TruncatedMessage"
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definition
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check_prio :: "data \<Rightarrow> obj_ref \<Rightarrow> (unit,'z::state_ext) se_monad"
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where
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"check_prio new_prio auth_tcb \<equiv>
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doE
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mcp \<leftarrow> liftE $ thread_get tcb_mcpriority auth_tcb;
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whenE (new_prio > ucast mcp) $ throwError (RangeError 0 (ucast mcp))
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odE"
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definition
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decode_set_priority :: "data list \<Rightarrow> cap \<Rightarrow> cslot_ptr \<Rightarrow> (cap \<times> cslot_ptr) list \<Rightarrow> (tcb_invocation,'z::state_ext) se_monad"
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where
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"decode_set_priority args cap slot extra_caps \<equiv> doE
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whenE (length args = 0 \<or> length extra_caps = 0) $ throwError TruncatedMessage;
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prio \<leftarrow> returnOk $ ucast (args ! 0);
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auth_tcb \<leftarrow> case fst (extra_caps ! 0) of
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ThreadCap tcb_ptr \<Rightarrow> returnOk tcb_ptr
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| _ \<Rightarrow> throwError (InvalidCapability 1);
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check_prio (args ! 0) auth_tcb;
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returnOk (ThreadControl (obj_ref_of cap) slot None None
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(Some (prio, auth_tcb)) None None None)
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odE"
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definition
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decode_set_mcpriority :: "data list \<Rightarrow> cap \<Rightarrow> cslot_ptr \<Rightarrow> (cap \<times> cslot_ptr) list \<Rightarrow> (tcb_invocation,'z::state_ext) se_monad"
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where
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"decode_set_mcpriority args cap slot extra_caps \<equiv> doE
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whenE (length args = 0 \<or> length extra_caps = 0) $ throwError TruncatedMessage;
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new_mcp \<leftarrow> returnOk $ ucast $ args ! 0;
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auth_tcb \<leftarrow> case fst (extra_caps ! 0) of
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ThreadCap tcb_ptr \<Rightarrow> returnOk tcb_ptr
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| _ \<Rightarrow> throwError (InvalidCapability 1);
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check_prio (args ! 0) auth_tcb;
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returnOk (ThreadControl (obj_ref_of cap) slot None (Some (new_mcp, auth_tcb))
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None None None None)
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odE"
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definition
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decode_set_sched_params :: "data list \<Rightarrow> cap \<Rightarrow> cslot_ptr \<Rightarrow> (cap \<times> cslot_ptr) list \<Rightarrow> (tcb_invocation,'z::state_ext) se_monad"
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where
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"decode_set_sched_params args cap slot extra_caps \<equiv> doE
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whenE (length args < 2) $ throwError TruncatedMessage;
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whenE (length extra_caps = 0) $ throwError TruncatedMessage;
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new_mcp \<leftarrow> returnOk $ ucast $ args ! 0;
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new_prio \<leftarrow> returnOk $ ucast $ args ! 1;
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auth_tcb \<leftarrow> case fst (extra_caps ! 0) of
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ThreadCap tcb_ptr \<Rightarrow> returnOk tcb_ptr
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| _ \<Rightarrow> throwError (InvalidCapability 1);
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check_prio (args ! 0) auth_tcb;
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check_prio (args ! 1) auth_tcb;
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returnOk (ThreadControl (obj_ref_of cap) slot None
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(Some (new_mcp, auth_tcb)) (Some (new_prio, auth_tcb)) None None None)
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odE"
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definition
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decode_set_ipc_buffer ::
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"data list \<Rightarrow> cap \<Rightarrow> cslot_ptr \<Rightarrow> (cap \<times> cslot_ptr) list \<Rightarrow> (tcb_invocation,'z::state_ext) se_monad"
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where
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"decode_set_ipc_buffer args cap slot excs \<equiv> doE
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whenE (length args = 0) $ throwError TruncatedMessage;
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whenE (length excs = 0) $ throwError TruncatedMessage;
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buffer \<leftarrow> returnOk $ data_to_vref $ args ! 0;
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(bcap, bslot) \<leftarrow> returnOk $ excs ! 0;
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newbuf \<leftarrow> if buffer = 0 then returnOk None
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else doE
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buffer_cap \<leftarrow> derive_cap bslot bcap;
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check_valid_ipc_buffer buffer buffer_cap;
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returnOk $ Some (buffer_cap, bslot)
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odE;
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returnOk $
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ThreadControl (obj_ref_of cap) slot None None None None None (Some (buffer, newbuf))
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odE"
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definition
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decode_set_space
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:: "data list \<Rightarrow> cap \<Rightarrow> cslot_ptr \<Rightarrow> (cap \<times> cslot_ptr) list \<Rightarrow> (tcb_invocation,'z::state_ext) se_monad"
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where
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"decode_set_space args cap slot excaps \<equiv> doE
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whenE (length args < 3 \<or> length excaps < 2) $ throwError TruncatedMessage;
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fault_ep \<leftarrow> returnOk $ args ! 0;
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croot_data \<leftarrow> returnOk $ args ! 1;
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vroot_data \<leftarrow> returnOk $ args ! 2;
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croot_arg \<leftarrow> returnOk $ excaps ! 0;
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vroot_arg \<leftarrow> returnOk $ excaps ! 1;
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can_chg_cr \<leftarrow> liftE $ liftM Not $ slot_cap_long_running_delete
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$ get_tcb_ctable_ptr $ obj_ref_of cap;
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can_chg_vr \<leftarrow> liftE $ liftM Not $ slot_cap_long_running_delete
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$ get_tcb_vtable_ptr $ obj_ref_of cap;
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unlessE (can_chg_cr \<and> can_chg_vr) $ throwError IllegalOperation;
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croot_cap \<leftarrow> returnOk $ fst croot_arg;
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croot_slot \<leftarrow> returnOk $ snd croot_arg;
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croot_cap' \<leftarrow> derive_cap croot_slot $
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(if croot_data = 0 then id else update_cap_data False croot_data)
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croot_cap;
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unlessE (is_cnode_cap croot_cap') $ throwError IllegalOperation;
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croot \<leftarrow> returnOk (croot_cap', croot_slot);
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vroot_cap \<leftarrow> returnOk $ fst vroot_arg;
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vroot_slot \<leftarrow> returnOk $ snd vroot_arg;
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vroot_cap' \<leftarrow> derive_cap vroot_slot $
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(if vroot_data = 0 then id else update_cap_data False vroot_data)
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vroot_cap;
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unlessE (is_valid_vtable_root vroot_cap') $ throwError IllegalOperation;
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vroot \<leftarrow> returnOk (vroot_cap', vroot_slot);
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returnOk $ ThreadControl (obj_ref_of cap) slot (Some (to_bl fault_ep)) None None
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(Some croot) (Some vroot) None
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odE"
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definition
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decode_tcb_configure ::
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"data list \<Rightarrow> cap \<Rightarrow> cslot_ptr \<Rightarrow> (cap \<times> cslot_ptr) list \<Rightarrow> (tcb_invocation,'z::state_ext) se_monad"
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where
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"decode_tcb_configure args cap slot extra_caps \<equiv> doE
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whenE (length args < 4) $ throwError TruncatedMessage;
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whenE (length extra_caps < 3) $ throwError TruncatedMessage;
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fault_ep \<leftarrow> returnOk $ args ! 0;
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croot_data \<leftarrow> returnOk $ args ! 1;
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vroot_data \<leftarrow> returnOk $ args ! 2;
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crootvroot \<leftarrow> returnOk $ take 2 extra_caps;
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buffer_cap \<leftarrow> returnOk $ extra_caps ! 2;
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buffer \<leftarrow> returnOk $ args ! 3;
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set_params \<leftarrow> decode_set_ipc_buffer [buffer] cap slot [buffer_cap];
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set_space \<leftarrow> decode_set_space [fault_ep, croot_data, vroot_data] cap slot crootvroot;
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returnOk $ ThreadControl (obj_ref_of cap) slot (tc_new_fault_ep set_space)
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None None
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(tc_new_croot set_space) (tc_new_vroot set_space)
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(tc_new_buffer set_params)
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odE"
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definition
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decode_bind_notification ::
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"cap \<Rightarrow> (cap \<times> cslot_ptr) list \<Rightarrow> (tcb_invocation,'z::state_ext) se_monad"
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where
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"decode_bind_notification cap extra_caps \<equiv> case cap of
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ThreadCap tcb \<Rightarrow> doE
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whenE (length extra_caps = 0) $ throwError TruncatedMessage;
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nTFN \<leftarrow> liftE $ get_bound_notification tcb;
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case nTFN of
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Some _ \<Rightarrow> throwError IllegalOperation
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| None \<Rightarrow> returnOk ();
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(ntfnptr, rights) \<leftarrow> case fst (hd extra_caps) of
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NotificationCap ptr _ r \<Rightarrow> returnOk (ptr, r)
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| _ \<Rightarrow> throwError IllegalOperation;
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whenE (AllowRecv \<notin> rights) $ throwError IllegalOperation;
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ntfn \<leftarrow> liftE $ get_notification ntfnptr;
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case (ntfn_obj ntfn, ntfn_bound_tcb ntfn) of
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(IdleNtfn, None) \<Rightarrow> returnOk ()
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| (ActiveNtfn _, None) \<Rightarrow> returnOk ()
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| _ \<Rightarrow> throwError IllegalOperation;
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returnOk $ NotificationControl tcb (Some ntfnptr)
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odE
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| _ \<Rightarrow> throwError IllegalOperation"
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definition
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decode_unbind_notification :: "cap \<Rightarrow> (tcb_invocation,'z::state_ext) se_monad"
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where
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"decode_unbind_notification cap \<equiv> case cap of
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ThreadCap tcb \<Rightarrow> doE
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nTFN \<leftarrow> liftE $ get_bound_notification tcb;
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case nTFN of
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None \<Rightarrow> throwError IllegalOperation
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| Some _ \<Rightarrow> returnOk ();
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returnOk $ NotificationControl tcb None
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odE
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| _ \<Rightarrow> throwError IllegalOperation"
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definition
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decode_set_tls_base :: "data list \<Rightarrow> cap \<Rightarrow> (tcb_invocation,'z::state_ext) se_monad"
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where
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"decode_set_tls_base args cap \<equiv> doE
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whenE (length args = 0) $ throwError TruncatedMessage;
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returnOk (SetTLSBase (obj_ref_of cap) (ucast (args ! 0)))
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odE"
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definition
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decode_tcb_invocation ::
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"data \<Rightarrow> data list \<Rightarrow> cap \<Rightarrow> cslot_ptr \<Rightarrow> (cap \<times> cslot_ptr) list \<Rightarrow>
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(tcb_invocation,'z::state_ext) se_monad"
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where
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"decode_tcb_invocation label args cap slot excs \<equiv>
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case gen_invocation_type label of
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TCBReadRegisters \<Rightarrow> decode_read_registers args cap
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| TCBWriteRegisters \<Rightarrow> decode_write_registers args cap
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| TCBCopyRegisters \<Rightarrow> decode_copy_registers args cap $ map fst excs
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| TCBSuspend \<Rightarrow> returnOk $ Suspend $ obj_ref_of cap
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| TCBResume \<Rightarrow> returnOk $ Resume $ obj_ref_of cap
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| TCBConfigure \<Rightarrow> decode_tcb_configure args cap slot excs
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| TCBSetPriority \<Rightarrow> decode_set_priority args cap slot excs
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| TCBSetMCPriority \<Rightarrow> decode_set_mcpriority args cap slot excs
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| TCBSetSchedParams \<Rightarrow> decode_set_sched_params args cap slot excs
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| TCBSetIPCBuffer \<Rightarrow> decode_set_ipc_buffer args cap slot excs
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| TCBSetSpace \<Rightarrow> decode_set_space args cap slot excs
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| TCBBindNotification \<Rightarrow> decode_bind_notification cap excs
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| TCBUnbindNotification \<Rightarrow> decode_unbind_notification cap
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| TCBSetTLSBase \<Rightarrow> decode_set_tls_base args cap
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| _ \<Rightarrow> throwError IllegalOperation"
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definition
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decode_domain_invocation ::
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"data \<Rightarrow> data list \<Rightarrow> (cap \<times> cslot_ptr) list \<Rightarrow>
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((obj_ref \<times> domain), 'z::state_ext) se_monad"
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where
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"decode_domain_invocation label args excs \<equiv> doE
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whenE (gen_invocation_type label \<noteq> DomainSetSet) $ throwError IllegalOperation;
|
|
domain \<leftarrow> (case args of
|
|
x # xs \<Rightarrow> doE
|
|
whenE (unat x \<ge> numDomains) $ throwError $ InvalidArgument 0;
|
|
returnOk (ucast x)
|
|
odE
|
|
| _ \<Rightarrow> throwError TruncatedMessage);
|
|
whenE (length excs = 0) $ throwError TruncatedMessage;
|
|
case (fst (hd excs)) of ThreadCap ptr \<Rightarrow> returnOk $ (ptr, domain)
|
|
| _ \<Rightarrow> throwError $ InvalidArgument 1
|
|
odE"
|
|
|
|
section "IRQ"
|
|
|
|
text \<open>The following two definitions decode system calls for the
|
|
interrupt controller and interrupt handlers\<close>
|
|
|
|
definition
|
|
decode_irq_control_invocation :: "data \<Rightarrow> data list \<Rightarrow> cslot_ptr \<Rightarrow> cap list
|
|
\<Rightarrow> (irq_control_invocation,'z::state_ext) se_monad" where
|
|
"decode_irq_control_invocation label args src_slot cps \<equiv>
|
|
(if gen_invocation_type label = IRQIssueIRQHandler
|
|
then if length args \<ge> 3 \<and> length cps \<ge> 1
|
|
then let irq_word = args ! 0;
|
|
index = args ! 1;
|
|
depth = args ! 2;
|
|
cnode = cps ! 0;
|
|
irq = ucast irq_word
|
|
in doE
|
|
arch_check_irq irq_word;
|
|
irq_active \<leftarrow> liftE $ is_irq_active irq;
|
|
whenE irq_active $ throwError RevokeFirst;
|
|
|
|
dest_slot \<leftarrow> lookup_target_slot
|
|
cnode (data_to_cptr index) (unat depth);
|
|
ensure_empty dest_slot;
|
|
|
|
returnOk $ IRQControl irq dest_slot src_slot
|
|
odE
|
|
else throwError TruncatedMessage
|
|
else liftME ArchIRQControl $ arch_decode_irq_control_invocation label args src_slot cps)"
|
|
|
|
definition
|
|
decode_irq_handler_invocation :: "data \<Rightarrow> irq \<Rightarrow> (cap \<times> cslot_ptr) list
|
|
\<Rightarrow> (irq_handler_invocation,'z::state_ext) se_monad" where
|
|
"decode_irq_handler_invocation label irq cps \<equiv>
|
|
if gen_invocation_type label = IRQAckIRQ
|
|
then returnOk $ ACKIrq irq
|
|
else if gen_invocation_type label = IRQSetIRQHandler
|
|
then if cps \<noteq> []
|
|
then let (cap, slot) = hd cps in
|
|
if is_ntfn_cap cap \<and> AllowSend \<in> cap_rights cap
|
|
then returnOk $ SetIRQHandler irq cap slot
|
|
else throwError $ InvalidCapability 0
|
|
else throwError TruncatedMessage
|
|
else if gen_invocation_type label = IRQClearIRQHandler
|
|
then returnOk $ ClearIRQHandler irq
|
|
else throwError IllegalOperation"
|
|
|
|
section "Untyped"
|
|
|
|
text \<open>The definitions in this section deal with decoding invocations
|
|
of untyped memory capabilities.
|
|
\<close>
|
|
|
|
definition
|
|
data_to_obj_type :: "data \<Rightarrow> (apiobject_type,'z::state_ext) se_monad" where
|
|
"data_to_obj_type type \<equiv> doE
|
|
n \<leftarrow> returnOk $ data_to_nat type;
|
|
if n = 0 then
|
|
returnOk $ Untyped
|
|
else if n = 1 then
|
|
returnOk $ TCBObject
|
|
else if n = 2 then
|
|
returnOk $ EndpointObject
|
|
else if n = 3 then
|
|
returnOk $ NotificationObject
|
|
else if n = 4 then
|
|
returnOk $ CapTableObject
|
|
else (case arch_data_to_obj_type (n - 5)
|
|
of Some tp \<Rightarrow> returnOk (ArchObject tp)
|
|
| None \<Rightarrow> throwError (InvalidArgument 0))
|
|
odE"
|
|
|
|
definition
|
|
decode_untyped_invocation ::
|
|
"data \<Rightarrow> data list \<Rightarrow> cslot_ptr \<Rightarrow> cap \<Rightarrow> cap list \<Rightarrow> (untyped_invocation,'z::state_ext) se_monad"
|
|
where
|
|
"decode_untyped_invocation label args slot cap excaps \<equiv> doE
|
|
unlessE (gen_invocation_type label = UntypedRetype) $ throwError IllegalOperation;
|
|
whenE (length args < 6) $ throwError TruncatedMessage;
|
|
whenE (length excaps = 0) $ throwError TruncatedMessage;
|
|
root_cap \<leftarrow> returnOk $ excaps ! 0;
|
|
new_type \<leftarrow> data_to_obj_type (args!0);
|
|
|
|
user_obj_size \<leftarrow> returnOk $ data_to_nat (args!1);
|
|
object_size \<leftarrow> returnOk (obj_bits_api new_type user_obj_size);
|
|
unlessE (user_obj_size < word_bits \<and> object_size \<le> untyped_max_bits)
|
|
$ throwError (RangeError 0 (of_nat untyped_max_bits));
|
|
whenE (new_type = CapTableObject \<and> user_obj_size = 0)
|
|
$ throwError (InvalidArgument 1);
|
|
whenE (new_type = Untyped \<and> user_obj_size < untyped_min_bits)
|
|
$ throwError (InvalidArgument 1);
|
|
node_index \<leftarrow> returnOk $ data_to_cptr (args!2);
|
|
node_depth \<leftarrow> returnOk $ data_to_nat (args!3);
|
|
|
|
node_cap \<leftarrow> if node_depth = 0
|
|
then returnOk root_cap
|
|
else doE
|
|
node_slot \<leftarrow> lookup_target_slot
|
|
root_cap node_index node_depth;
|
|
liftE $ get_cap node_slot
|
|
odE;
|
|
|
|
if is_cnode_cap node_cap
|
|
then returnOk ()
|
|
else throwError $ FailedLookup False $ MissingCapability node_depth;
|
|
|
|
node_offset \<leftarrow> returnOk $ data_to_nat (args ! 4);
|
|
node_window \<leftarrow> returnOk $ data_to_nat (args ! 5);
|
|
radix_bits \<leftarrow> returnOk $ bits_of node_cap;
|
|
node_size \<leftarrow> returnOk (2 ^ radix_bits);
|
|
|
|
whenE (node_offset < 0 \<or> node_offset > node_size - 1) $
|
|
throwError $ RangeError 0 (of_nat (node_size - 1));
|
|
|
|
whenE (node_window < 1 \<or> node_window > unat retypeFanOutLimit) $ throwError $ RangeError 1 retypeFanOutLimit;
|
|
|
|
whenE (node_window < 1 \<or> node_window > node_size - node_offset) $
|
|
throwError $ RangeError 1 (of_nat (node_size - node_offset));
|
|
|
|
oref \<leftarrow> returnOk $ obj_ref_of node_cap;
|
|
offsets \<leftarrow> returnOk $ map (nat_to_cref radix_bits)
|
|
[node_offset ..< node_offset + node_window];
|
|
slots \<leftarrow> returnOk $ map (\<lambda>cref. (oref, cref)) offsets;
|
|
|
|
mapME_x ensure_empty slots;
|
|
|
|
reset \<leftarrow> liftE $ const_on_failure False $ (doE
|
|
ensure_no_children slot;
|
|
returnOk True
|
|
odE);
|
|
|
|
free_index \<leftarrow> returnOk (if reset then 0 else free_index_of cap);
|
|
free_ref \<leftarrow> returnOk (get_free_ref (obj_ref_of cap) free_index);
|
|
aligned_free_ref \<leftarrow> returnOk (alignUp free_ref object_size);
|
|
untyped_free_bytes \<leftarrow> returnOk (obj_size cap - of_nat (free_index));
|
|
|
|
max_count \<leftarrow> returnOk ( untyped_free_bytes >> object_size);
|
|
whenE (unat max_count < node_window) $
|
|
throwError $ NotEnoughMemory $ untyped_free_bytes;
|
|
|
|
not_frame \<leftarrow> returnOk (\<not> is_frame_type new_type);
|
|
(ptr, is_device) \<leftarrow> case cap of
|
|
UntypedCap dev p n f \<Rightarrow> returnOk (p,dev)
|
|
| _ \<Rightarrow> fail;
|
|
whenE (is_device \<and> not_frame \<and> new_type \<noteq> Untyped) $
|
|
throwError $ InvalidArgument 1;
|
|
returnOk $ Retype slot reset ptr aligned_free_ref new_type user_obj_size slots is_device
|
|
odE"
|
|
|
|
section "Toplevel invocation decode."
|
|
|
|
text \<open>This definition is the toplevel decoding definition; it dispatches
|
|
to the above definitions, after checking, in some cases, whether the
|
|
invocation is allowed.
|
|
\<close>
|
|
|
|
definition
|
|
decode_invocation ::
|
|
"data \<Rightarrow> data list \<Rightarrow> cap_ref \<Rightarrow> cslot_ptr \<Rightarrow> cap \<Rightarrow> (cap \<times> cslot_ptr) list \<Rightarrow> (invocation,'z::state_ext) se_monad"
|
|
where
|
|
"decode_invocation label args cap_index slot cap excaps \<equiv>
|
|
case cap of
|
|
EndpointCap ptr badge rights \<Rightarrow>
|
|
if AllowSend \<in> rights then
|
|
returnOk $ InvokeEndpoint ptr badge (AllowGrant \<in> rights) (AllowGrantReply \<in> rights)
|
|
else throwError $ InvalidCapability 0
|
|
| NotificationCap ptr badge rights \<Rightarrow>
|
|
if AllowSend \<in> rights then
|
|
returnOk $ InvokeNotification ptr badge
|
|
else throwError $ InvalidCapability 0
|
|
| ReplyCap thread False rights \<Rightarrow>
|
|
returnOk $ InvokeReply thread slot (AllowGrant \<in> rights)
|
|
| IRQControlCap \<Rightarrow>
|
|
liftME InvokeIRQControl
|
|
$ decode_irq_control_invocation label args slot (map fst excaps)
|
|
| IRQHandlerCap irq \<Rightarrow>
|
|
liftME InvokeIRQHandler
|
|
$ decode_irq_handler_invocation label irq excaps
|
|
| ThreadCap ptr \<Rightarrow>
|
|
liftME InvokeTCB $ decode_tcb_invocation label args cap slot excaps
|
|
| DomainCap \<Rightarrow>
|
|
liftME (case_prod InvokeDomain) $ decode_domain_invocation label args excaps
|
|
| CNodeCap ptr bits _ \<Rightarrow>
|
|
liftME InvokeCNode $ decode_cnode_invocation label args cap (map fst excaps)
|
|
| UntypedCap dev ptr sz fi \<Rightarrow>
|
|
liftME InvokeUntyped $ decode_untyped_invocation label args slot cap (map fst excaps)
|
|
| ArchObjectCap arch_cap \<Rightarrow>
|
|
liftME InvokeArchObject $
|
|
arch_decode_invocation label args cap_index slot arch_cap excaps
|
|
| _ \<Rightarrow>
|
|
throwError $ InvalidCapability 0"
|
|
|
|
end
|