Derek Lesho : ntoskrnl.exe: Add emulation of rdmsr for MSR_LSTAR control register.
Alexandre Julliard
julliard at winehq.org
Fri Mar 22 16:06:20 CDT 2019
Module: wine
Branch: master
Commit: e7863eaa4e401aa98c3946daae0a2607fbd72ab4
URL: https://source.winehq.org/git/wine.git/?a=commit;h=e7863eaa4e401aa98c3946daae0a2607fbd72ab4
Author: Derek Lesho <dereklesho52 at gmail.com>
Date: Thu Mar 21 11:10:08 2019 -0400
ntoskrnl.exe: Add emulation of rdmsr for MSR_LSTAR control register.
Signed-off-by: Derek Lesho <dereklesho52 at Gmail.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>
---
dlls/ntoskrnl.exe/instr.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/dlls/ntoskrnl.exe/instr.c b/dlls/ntoskrnl.exe/instr.c
index 67cdd32..90a63b0 100644
--- a/dlls/ntoskrnl.exe/instr.c
+++ b/dlls/ntoskrnl.exe/instr.c
@@ -473,6 +473,8 @@ WINE_DEFAULT_DEBUG_CHANNEL(int);
#define REX_R 4
#define REX_W 8
+#define MSR_LSTAR 0xc0000082
+
#define REGMODRM_MOD( regmodrm, rex ) ((regmodrm) >> 6)
#define REGMODRM_REG( regmodrm, rex ) (((regmodrm) >> 3) & 7) | (((rex) & REX_R) ? 8 : 0)
#define REGMODRM_RM( regmodrm, rex ) (((regmodrm) & 7) | (((rex) & REX_B) ? 8 : 0))
@@ -586,6 +588,12 @@ static BYTE *INSTR_GetOperandAddr( CONTEXT *context, BYTE *instr,
}
+static void fake_syscall_function(void)
+{
+ TRACE("() stub\n");
+}
+
+
/***********************************************************************
* emulate_instruction
*
@@ -757,6 +765,24 @@ static DWORD emulate_instruction( EXCEPTION_RECORD *rec, CONTEXT *context )
context->Rip += prefixlen + 3;
return ExceptionContinueExecution;
}
+ case 0x32: /* rdmsr */
+ {
+ ULONG reg = context->Rcx;
+ TRACE("rdmsr CR 0x%08x\n", reg);
+ switch (reg)
+ {
+ case MSR_LSTAR:
+ {
+ ULONG_PTR syscall_address = (ULONG_PTR)fake_syscall_function;
+ context->Rdx = (ULONG)(syscall_address >> 32);
+ context->Rax = (ULONG)syscall_address;
+ break;
+ }
+ default: return ExceptionContinueSearch;
+ }
+ context->Rip += prefixlen + 2;
+ return ExceptionContinueExecution;
+ }
case 0xb6: /* movzx Eb, Gv */
case 0xb7: /* movzx Ew, Gv */
{
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