Changeset 105739 in vbox for trunk/src/VBox/VMM/include

Timestamp:

Aug 19, 2024 11:42:23 PM (6 months ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

164444

Message:

VMM/IEM: Don't try save IEMNATIVE_REG_FIXED_TMP0 together with other in-use volatile registers when making calls (todo 10). bugref:10720

File:

• trunk/src/VBox/VMM/include/IEMN8veRecompiler.h (modified) (2 diffs)

trunk/src/VBox/VMM/include/IEMN8veRecompiler.h

@@ -184 +184 @@
 /** @def IEMNATIVE_REG_FIXED_TMP0
  * Dedicated temporary register.
+ * @note This has extremely short lifetime, must be used with great care to make
+ *       sure any calling code or code being called is making use of it.
+ *       It will definitely not survive a call or anything of that nature.
  * @todo replace this by a register allocator and content tracker.  */
 /** @def IEMNATIVE_REG_FIXED_MASK
@@ -409 +412 @@
 # endif
 #endif
+
+/** @def IEMNATIVE_CALL_VOLATILE_NOTMP_GREG_MASK
+ * Variant of IEMNATIVE_CALL_VOLATILE_GREG_MASK that excludes
+ * IEMNATIVE_REG_FIXED_TMP0 on hosts that uses it. */
+#ifdef IEMNATIVE_REG_FIXED_TMP0
+# ifdef IEMNATIVE_REG_FIXED_TMP1
+#  define IEMNATIVE_CALL_VOLATILE_NOTMP_GREG_MASK   (  IEMNATIVE_CALL_VOLATILE_GREG_MASK \
+                                                     & ~(  RT_BIT_32(IEMNATIVE_REG_FIXED_TMP0) \
+                                                         | RT_BIT_32(IEMNATIVE_REG_FIXED_TMP1)))
+# else
+#  define IEMNATIVE_CALL_VOLATILE_NOTMP_GREG_MASK   (IEMNATIVE_CALL_VOLATILE_GREG_MASK & ~RT_BIT_32(IEMNATIVE_REG_FIXED_TMP0))
+# endif
+#else
+# define IEMNATIVE_CALL_VOLATILE_NOTMP_GREG_MASK    IEMNATIVE_CALL_VOLATILE_GREG_MASK
+#endif
 /** @} */