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Fix previous mode detection by reading CS from the trap frame
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This commit is contained in:
Aiken Harris
2026-03-31 23:10:45 +02:00
parent 620fc24cd2
commit d00577ac8d
2 changed files with 2 additions and 1 deletions
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2
xtoskrnl/ar/i686/archsup.S
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@@ -111,7 +111,7 @@ _Ar\Type\Vector\()Start:
/* Test previous mode and swap GS if needed */ /* Test previous mode and swap GS if needed */
movl $0, TrapPreviousMode(%ebp) movl $0, TrapPreviousMode(%ebp)
mov %cs, %ax mov TrapSegCs(%ebp), %ax
and $3, %al and $3, %al
mov %al, TrapPreviousMode(%ebp) mov %al, TrapPreviousMode(%ebp)
jz KernelMode\Type\Vector jz KernelMode\Type\Vector

1
xtoskrnl/includes/ar/i686/asmsup.h
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@@ -25,6 +25,7 @@
#define TrapSegFs 40 #define TrapSegFs 40
#define TrapSegGs 42 #define TrapSegGs 42
#define TrapVector 72 #define TrapVector 72
#define TrapSegCs 84
#define TrapEsp 92 #define TrapEsp 92
#define TrapSegSs 96 #define TrapSegSs 96