fixed: int86 failed to preserve returned flags (backported from 256boss)

[bootcensus] / src / boot / boot2.s

diff --git a/src/boot/boot2.s b/src/boot/boot2.s
index bf81487..f782d7e 100644 (file)
--- a/src/boot/boot2.s
+++ b/src/boot/boot2.s
@@ -766,6 +766,7 @@ saved_ebp: .long 0
 saved_eax: .long 0
 saved_es: .word 0
 saved_ds: .word 0
+saved_flags: .word 0
 
        # drop back to unreal mode to call 16bit interrupt
        .global int86
@@ -827,6 +828,9 @@ int_op:     int $0
        mov %eax, saved_eax
        mov %ds, saved_ds
        mov %es, saved_es
+       pushfw
+       pop %ax
+       mov %ax, saved_flags
 
        # re-enable protection
        mov %cr0, %eax
@@ -851,7 +855,8 @@ int_op:     int $0
        pushw %ax
        mov saved_es, %ax
        pushw %ax
-       pushfw
+       mov saved_flags, %ax
+       pushw %ax
        mov saved_eax, %eax
        pushal
        mov saved_esp, %esp