Changeset 105073 in vbox

Timestamp:

Jun 28, 2024 3:20:50 PM (5 months ago)

Author:

vboxsync

Message:

bs3kit/Bs3RegCtxRestore: Do LM16 and LM32 restores via syscalls so we can make sure r8-r15 and high register values are correctly loaded. This is a bit risky, but it fixes running bs3-cpu-weird-1 on real hw where the BIOS/EFI leave r8-r15 in a non-zero state. bugref:10715

File:

• trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-RegCtxRestore.asm (modified) (1 diff)

trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-RegCtxRestore.asm

@@ -84 +84 @@
         cmp     byte [BS3_DATA16_WRT(g_bBs3CurrentMode)], BS3_MODE_RM
         je      .in_ring0
+        cmp     byte [BS3_DATA16_WRT(g_bBs3CurrentMode)], BS3_MODE_LM16
+        je      .do_syscall_restore_ctx
         test    byte [BS3_DATA16_WRT(g_bBs3CurrentMode)], BS3_MODE_CODE_V86
         jnz     .do_syscall_restore_ctx
+%elif TMPL_BITS == 32
+        cmp     byte [BS3_DATA16_WRT(g_bBs3CurrentMode)], BS3_MODE_LM32
+        je      .do_syscall_restore_ctx
 %endif
         mov     ax, ss