QEMU host page size getter (#73)

* QEMU host page size getter
* Rename to sync_exit

Author: rmalmain

include/libafl/exit.h

@@ -22,7 +22,7 @@ void libafl_qemu_trigger_breakpoint(CPUState* cpu);
 enum libafl_exit_reason_kind {
     INTERNAL = 0,
     BREAKPOINT = 1,
-    SYNC_BACKDOOR = 2,
+    SYNC_EXIT = 2,
 };
 
 // A breakpoint has been triggered.
@@ -31,7 +31,7 @@ struct libafl_exit_reason_breakpoint {
 };
 
 // A synchronous exit has been triggered.
-struct libafl_exit_reason_sync_backdoor { };
+struct libafl_exit_reason_sync_exit { };
 
 // QEMU exited on its own for some reason.
 struct libafl_exit_reason_internal {
@@ -46,7 +46,7 @@ struct libafl_exit_reason {
     union {
         struct libafl_exit_reason_internal internal;
         struct libafl_exit_reason_breakpoint breakpoint; // kind == BREAKPOINT
-        struct libafl_exit_reason_sync_backdoor backdoor; // kind == SYNC_BACKDOOR
+        struct libafl_exit_reason_sync_exit sync_exit; // kind == SYNC_EXIT
     } data;
 };
 

include/libafl/utils.h

@@ -2,6 +2,14 @@
 
 #include "qemu/osdep.h"
 
+#ifndef CONFIG_USER_ONLY
+#include "exec/memory.h"
+#include "qemu/rcu.h"
+#include "cpu.h"
+#endif
+
+uintptr_t libafl_qemu_host_page_size(void);
+
 #ifndef CONFIG_USER_ONLY
 uint8_t* libafl_paddr2host(CPUState* cpu, hwaddr addr, bool is_write);
 #endif

libafl/exit.c

@@ -110,7 +110,7 @@ void libafl_exit_request_internal(CPUState* cpu, uint64_t pc, ShutdownCause caus
 
 void libafl_exit_request_sync_backdoor(CPUState* cpu, target_ulong pc)
 {
-    last_exit_reason.kind = SYNC_BACKDOOR;
+    last_exit_reason.kind = SYNC_EXIT;
 
     prepare_qemu_exit(cpu, pc);
 }

libafl/utils.c

@@ -1,12 +1,12 @@
 #include "qemu/osdep.h"
-
-#ifndef CONFIG_USER_ONLY
-#include "exec/memory.h"
-#include "qemu/rcu.h"
-#include "cpu.h"
-
 #include "libafl/utils.h"
 
+uintptr_t libafl_qemu_host_page_size(void)
+{
+    return qemu_real_host_page_size();
+}
+
+#ifndef CONFIG_USER_ONLY
 uint8_t* libafl_paddr2host(CPUState* cpu, hwaddr addr, bool is_write)
 {
     if (addr == -1) {