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diff --git a/Marlin/src/feature/e_parser.h b/Marlin/src/feature/e_parser.h
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * e_parser.h - Intercept special commands directly in the serial stream
+ */
+
+#include "../inc/MarlinConfigPre.h"
+
+#if ENABLED(HOST_PROMPT_SUPPORT)
+  #include "host_actions.h"
+#endif
+
+// External references
+extern bool wait_for_user, wait_for_heatup;
+
+class EmergencyParser {
+
+public:
+
+  // Currently looking for: M108, M112, M410, M876
+  enum State : char {
+    EP_RESET,
+    EP_N,
+    EP_M,
+    EP_M1,
+    EP_M10,
+    EP_M108,
+    EP_M11,
+    EP_M112,
+    EP_M4,
+    EP_M41,
+    EP_M410,
+    #if ENABLED(HOST_PROMPT_SUPPORT)
+      EP_M8,
+      EP_M87,
+      EP_M876,
+      EP_M876S,
+      EP_M876SN,
+    #endif
+    EP_IGNORE // to '\n'
+  };
+
+  static bool killed_by_M112;
+  static bool quickstop_by_M410;
+
+  #if ENABLED(HOST_PROMPT_SUPPORT)
+    static uint8_t M876_reason;
+  #endif
+
+  EmergencyParser() { enable(); }
+
+  FORCE_INLINE static void enable()  { enabled = true; }
+
+  FORCE_INLINE static void disable() { enabled = false; }
+
+  FORCE_INLINE static void update(State &state, const uint8_t c) {
+    switch (state) {
+      case EP_RESET:
+        switch (c) {
+          case ' ': case '\n': case '\r': break;
+          case 'N': state = EP_N;      break;
+          case 'M': state = EP_M;      break;
+          default: state  = EP_IGNORE;
+        }
+        break;
+
+      case EP_N:
+        switch (c) {
+          case '0' ... '9':
+          case '-': case ' ':   break;
+          case 'M': state = EP_M;      break;
+          default:  state = EP_IGNORE;
+        }
+        break;
+
+      case EP_M:
+        switch (c) {
+          case ' ': break;
+          case '1': state = EP_M1;     break;
+          case '4': state = EP_M4;     break;
+          #if ENABLED(HOST_PROMPT_SUPPORT)
+            case '8': state = EP_M8;     break;
+          #endif
+          default: state  = EP_IGNORE;
+        }
+        break;
+
+      case EP_M1:
+        switch (c) {
+          case '0': state = EP_M10;    break;
+          case '1': state = EP_M11;    break;
+          default: state  = EP_IGNORE;
+        }
+        break;
+
+      case EP_M10:
+        state = (c == '8') ? EP_M108 : EP_IGNORE;
+        break;
+
+      case EP_M11:
+        state = (c == '2') ? EP_M112 : EP_IGNORE;
+        break;
+
+      case EP_M4:
+        state = (c == '1') ? EP_M41 : EP_IGNORE;
+        break;
+
+      case EP_M41:
+        state = (c == '0') ? EP_M410 : EP_IGNORE;
+        break;
+
+      #if ENABLED(HOST_PROMPT_SUPPORT)
+      case EP_M8:
+        state = (c == '7') ? EP_M87 : EP_IGNORE;
+        break;
+
+      case EP_M87:
+        state = (c == '6') ? EP_M876 : EP_IGNORE;
+        break;
+
+      case EP_M876:
+        switch (c) {
+          case ' ': break;
+          case 'S': state = EP_M876S; break;
+          default:  state = EP_IGNORE; break;
+        }
+        break;
+
+      case EP_M876S:
+        switch (c) {
+          case ' ': break;
+          case '0' ... '9':
+            state = EP_M876SN;
+            M876_reason = (uint8_t)(c - '0');
+            break;
+        }
+        break;
+      #endif
+
+      case EP_IGNORE:
+        if (ISEOL(c)) state = EP_RESET;
+        break;
+
+      default:
+        if (ISEOL(c)) {
+          if (enabled) switch (state) {
+            case EP_M108: wait_for_user = wait_for_heatup = false; break;
+            case EP_M112: killed_by_M112 = true; break;
+            case EP_M410: quickstop_by_M410 = true; break;
+            #if ENABLED(HOST_PROMPT_SUPPORT)
+              case EP_M876SN: host_response_handler(M876_reason); break;
+            #endif
+            default: break;
+          }
+          state = EP_RESET;
+        }
+    }
+  }
+
+private:
+  static bool enabled;
+};
+
+extern EmergencyParser emergency_parser;