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wine-staging/patches/Exagear/0001-ntdll-Implement-emulation-of-SIDT-instruction-when-u.patch
Sebastian Lackner a52c90b145 Rebase against 6c637ab9c6a65d5601f98545b05f413f777c444e.
2016-03-02 23:32:04 +01:00

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From 472184e5801de5d1fb92d275d9c0c7e840c9a0bf Mon Sep 17 00:00:00 2001
From: Sebastian Lackner <sebastian@fds-team.de>
Date: Tue, 11 Nov 2014 03:11:33 +0100
Subject: ntdll: Implement emulation of SIDT instruction when using Exagear.
---
configure.ac | 8 ++
dlls/ntdll/signal_i386.c | 223 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 231 insertions(+)
diff --git a/configure.ac b/configure.ac
index 1e6bba3..43bf0db 100644
--- a/configure.ac
+++ b/configure.ac
@@ -32,6 +32,7 @@ AC_ARG_ENABLE(win16, AS_HELP_STRING([--disable-win16],[do not include Win16 supp
AC_ARG_ENABLE(win64, AS_HELP_STRING([--enable-win64],[build a Win64 emulator on AMD64 (won't run Win32 binaries)]))
AC_ARG_ENABLE(tests, AS_HELP_STRING([--disable-tests],[do not build the regression tests]))
AC_ARG_ENABLE(maintainer-mode, AS_HELP_STRING([--enable-maintainer-mode],[enable maintainer-specific build rules]))
+AC_ARG_ENABLE(exagear-compat, AS_HELP_STRING([--enable-exagear-compat],[use workarounds for known problems in the Exagear emulator]))
AC_ARG_WITH(alsa, AS_HELP_STRING([--without-alsa],[do not use the Alsa sound support]),
[if test "x$withval" = "xno"; then ac_cv_header_sys_asoundlib_h=no; ac_cv_header_alsa_asoundlib_h=no; fi])
@@ -364,6 +365,13 @@ WINE_WARNING_WITH(gettext,[test "$MSGFMT" = false],
[gettext tools not found (or too old), translations won't be built.],
[enable_po])
+dnl **** Enable Exagear workarounds ****
+
+if test "x$enable_exagear_compat" = "xyes"
+then
+ AC_DEFINE(EXAGEAR_COMPAT, 1, [Define if you want to enable Exagear emulator workarounds])
+fi
+
dnl **** Check for some libraries ****
dnl Check for -li386 for NetBSD and OpenBSD
diff --git a/dlls/ntdll/signal_i386.c b/dlls/ntdll/signal_i386.c
index ee8855a..4269329 100644
--- a/dlls/ntdll/signal_i386.c
+++ b/dlls/ntdll/signal_i386.c
@@ -96,6 +96,14 @@ typedef struct
BYTE Reserved4[96];
} XMM_SAVE_AREA32;
+#include "pshpack1.h"
+struct idtr
+{
+ WORD limit;
+ BYTE *base;
+};
+#include "poppack.h"
+
/***********************************************************************
* signal context platform-specific definitions
*/
@@ -1898,6 +1906,213 @@ static inline DWORD get_fpu_code( const CONTEXT *context )
}
+#ifdef EXAGEAR_COMPAT
+
+/***********************************************************************
+ * INSTR_GetOperandAddr
+ *
+ * Return the address of an instruction operand (from the mod/rm byte).
+ */
+static BYTE *INSTR_GetOperandAddr( CONTEXT *context, const BYTE *instr,
+ int long_addr, int segprefix, int *len )
+{
+ int mod, rm, base = 0, index = 0, ss = 0, off;
+
+#define GET_VAL(val,type) \
+ { *val = *(type *)instr; instr += sizeof(type); *len += sizeof(type); }
+
+ *len = 0;
+ GET_VAL( &mod, BYTE );
+ rm = mod & 7;
+ mod >>= 6;
+
+ if (mod == 3)
+ {
+ switch(rm)
+ {
+ case 0: return (BYTE *)&context->Eax;
+ case 1: return (BYTE *)&context->Ecx;
+ case 2: return (BYTE *)&context->Edx;
+ case 3: return (BYTE *)&context->Ebx;
+ case 4: return (BYTE *)&context->Esp;
+ case 5: return (BYTE *)&context->Ebp;
+ case 6: return (BYTE *)&context->Esi;
+ case 7: return (BYTE *)&context->Edi;
+ }
+ }
+
+ if (long_addr)
+ {
+ if (rm == 4)
+ {
+ BYTE sib;
+ GET_VAL( &sib, BYTE );
+ rm = sib & 7;
+ ss = sib >> 6;
+ switch((sib >> 3) & 7)
+ {
+ case 0: index = context->Eax; break;
+ case 1: index = context->Ecx; break;
+ case 2: index = context->Edx; break;
+ case 3: index = context->Ebx; break;
+ case 4: index = 0; break;
+ case 5: index = context->Ebp; break;
+ case 6: index = context->Esi; break;
+ case 7: index = context->Edi; break;
+ }
+ }
+
+ switch(rm)
+ {
+ case 0: base = context->Eax; break;
+ case 1: base = context->Ecx; break;
+ case 2: base = context->Edx; break;
+ case 3: base = context->Ebx; break;
+ case 4: base = context->Esp; break;
+ case 5: base = context->Ebp; break;
+ case 6: base = context->Esi; break;
+ case 7: base = context->Edi; break;
+ }
+ switch (mod)
+ {
+ case 0:
+ if (rm == 5) /* special case: ds:(disp32) */
+ {
+ GET_VAL( &base, DWORD );
+ }
+ break;
+
+ case 1: /* 8-bit disp */
+ GET_VAL( &off, BYTE );
+ base += (signed char)off;
+ break;
+
+ case 2: /* 32-bit disp */
+ GET_VAL( &off, DWORD );
+ base += (signed long)off;
+ break;
+ }
+ }
+ else /* short address */
+ {
+ switch(rm)
+ {
+ case 0: /* ds:(bx,si) */
+ base = LOWORD(context->Ebx) + LOWORD(context->Esi);
+ break;
+ case 1: /* ds:(bx,di) */
+ base = LOWORD(context->Ebx) + LOWORD(context->Edi);
+ break;
+ case 2: /* ss:(bp,si) */
+ base = LOWORD(context->Ebp) + LOWORD(context->Esi);
+ break;
+ case 3: /* ss:(bp,di) */
+ base = LOWORD(context->Ebp) + LOWORD(context->Edi);
+ break;
+ case 4: /* ds:(si) */
+ base = LOWORD(context->Esi);
+ break;
+ case 5: /* ds:(di) */
+ base = LOWORD(context->Edi);
+ break;
+ case 6: /* ss:(bp) */
+ base = LOWORD(context->Ebp);
+ break;
+ case 7: /* ds:(bx) */
+ base = LOWORD(context->Ebx);
+ break;
+ }
+
+ switch(mod)
+ {
+ case 0:
+ if (rm == 6) /* special case: ds:(disp16) */
+ {
+ GET_VAL( &base, WORD );
+ }
+ break;
+
+ case 1: /* 8-bit disp */
+ GET_VAL( &off, BYTE );
+ base += (signed char)off;
+ break;
+
+ case 2: /* 16-bit disp */
+ GET_VAL( &off, WORD );
+ base += (signed short)off;
+ break;
+ }
+ base &= 0xffff;
+ }
+ /* FIXME: we assume that all segments have a base of 0 */
+ return (BYTE *)(base + (index << ss));
+#undef GET_VAL
+}
+
+
+/***********************************************************************
+ * check_invalid_instr
+ *
+ * Support for instructions not implemented by Exagear.
+ */
+static inline BOOL check_invalid_instr( CONTEXT *context )
+{
+ const BYTE *instr;
+ unsigned int prefix_count = 0;
+ int len, long_addr = 1;
+
+ if (!wine_ldt_is_system( context->SegCs )) return FALSE;
+ instr = (BYTE *)context->Eip;
+
+ for (;;) switch (*instr)
+ {
+ /* instruction prefixes */
+ case 0x2e: /* %cs: */
+ case 0x36: /* %ss: */
+ case 0x3e: /* %ds: */
+ case 0x26: /* %es: */
+ case 0x64: /* %fs: */
+ case 0x65: /* %gs: */
+ case 0x66: /* opcode size */
+ case 0x67: /* addr size */
+ case 0xf0: /* lock */
+ case 0xf2: /* repne */
+ case 0xf3: /* repe */
+ if (++prefix_count >= 15) return FALSE;
+ if (*instr == 0x67) long_addr = !long_addr; /* addr size */
+ instr++;
+ continue;
+ case 0x0f: /* extended instruction */
+ switch (instr[1])
+ {
+ case 0x01:
+ if (((instr[2] >> 3) & 7) == 1) /* sidt m */
+ {
+ struct idtr ret;
+ BYTE *addr;
+
+ if ((instr[2] >> 6) == 3) return FALSE; /* loading to register not allowed */
+ addr = INSTR_GetOperandAddr( context, instr + 2, long_addr, 0, &len );
+
+ /* fake IDT structure */
+ ret.limit = 0xfff;
+ ret.base = (void *)0xff000000;
+ memcpy(addr, &ret, sizeof(ret));
+
+ context->Eip += prefix_count + len + 2;
+ return TRUE;
+ }
+ break;
+ }
+ return FALSE;
+ default:
+ return FALSE;
+ }
+}
+
+#endif /* EXAGEAR_COMPAT */
+
+
/**********************************************************************
* raise_segv_exception
*/
@@ -1907,6 +2122,14 @@ static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context
switch(rec->ExceptionCode)
{
+#ifdef EXAGEAR_COMPAT
+ case EXCEPTION_ILLEGAL_INSTRUCTION:
+ {
+ if (check_invalid_instr( context ))
+ goto done;
+ }
+ break;
+#endif
case EXCEPTION_ACCESS_VIOLATION:
if (rec->NumberParameters == 2)
{
--
2.7.1
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