/*******************************************************************
* BuildPendingEventCheck
*
* Build a function that checks whether there are any
* pending DPMI events.
*
* Stack layout:
*
* (sp+12) long eflags
* (sp+6) long cs
* (sp+2) long ip
* (sp) word fs
*
* On entry to function, fs register points to a valid TEB.
* On exit from function, stack will be popped.
*/
static void BuildPendingEventCheck(void)
{
/* Function header */
function_header( "DPMI_PendingEventCheck" );
/* Check for pending events. */
output( "\t.byte 0x64\n\ttestl $0xffffffff,(%d)\n",
STRUCTOFFSET(TEB,GdiTebBatch) + STRUCTOFFSET(WINE_VM86_TEB_INFO,vm86_pending) );
output( "\tje %s\n", asm_name("DPMI_PendingEventCheck_Cleanup") );
output( "\t.byte 0x64\n\ttestl $0xffffffff,(%d)\n",
STRUCTOFFSET(TEB,GdiTebBatch) + STRUCTOFFSET(WINE_VM86_TEB_INFO,dpmi_vif) );
output( "\tje %s\n", asm_name("DPMI_PendingEventCheck_Cleanup") );
/* Process pending events. */
output( "\tsti\n" );
/* Start cleanup. Restore fs register. */
output( "%s\n", asm_globl("DPMI_PendingEventCheck_Cleanup") );
output( "\tpopw %%fs\n" );
/* Return from function. */
output( "%s\n", asm_globl("DPMI_PendingEventCheck_Return") );
output( "\tiret\n" );
output_function_size( "DPMI_PendingEventCheck" );
}
/*******************************************************************
* BuildCallFrom16Core
*
* This routine builds the core routines used in 16->32 thunks:
* CallFrom16Word, CallFrom16Long, CallFrom16Register, and CallFrom16Thunk.
*
* These routines are intended to be called via a far call (with 32-bit
* operand size) from 16-bit code. The 16-bit code stub must push %bp,
* the 32-bit entry point to be called, and the argument conversion
* routine to be used (see stack layout below).
*
* The core routine completes the STACK16FRAME on the 16-bit stack and
* switches to the 32-bit stack. Then, the argument conversion routine
* is called; it gets passed the 32-bit entry point and a pointer to the
* 16-bit arguments (on the 16-bit stack) as parameters. (You can either
* use conversion routines automatically generated by BuildCallFrom16,
* or write your own for special purposes.)
*
* The conversion routine must call the 32-bit entry point, passing it
* the converted arguments, and return its return value to the core.
* After the conversion routine has returned, the core switches back
* to the 16-bit stack, converts the return value to the DX:AX format
* (CallFrom16Long), and returns to the 16-bit call stub. All parameters,
* including %bp, are popped off the stack.
*
* The 16-bit call stub now returns to the caller, popping the 16-bit
* arguments if necessary (pascal calling convention).
*
* In the case of a 'register' function, CallFrom16Register fills a
* CONTEXT86 structure with the values all registers had at the point
* the first instruction of the 16-bit call stub was about to be
* executed. A pointer to this CONTEXT86 is passed as third parameter
* to the argument conversion routine, which typically passes it on
* to the called 32-bit entry point.
*
* CallFrom16Thunk is a special variant used by the implementation of
* the Win95 16->32 thunk functions C16ThkSL and C16ThkSL01 and is
* implemented as follows:
* On entry, the EBX register is set up to contain a flat pointer to the
* 16-bit stack such that EBX+22 points to the first argument.
* Then, the entry point is called, while EBP is set up to point
* to the return address (on the 32-bit stack).
* The called function returns with CX set to the number of bytes
* to be popped of the caller's stack.
*
* Stack layout upon entry to the core routine (STACK16FRAME):
* ... ...
* (sp+24) word first 16-bit arg
* (sp+22) word cs
* (sp+20) word ip
* (sp+18) word bp
* (sp+14) long 32-bit entry point (reused for Win16 mutex recursion count)
* (sp+12) word ip of actual entry point (necessary for relay debugging)
* (sp+8) long relay (argument conversion) function entry point
* (sp+4) long cs of 16-bit entry point
* (sp) long ip of 16-bit entry point
*
* Added on the stack:
* (sp-2) word saved gs
* (sp-4) word saved fs
* (sp-6) word saved es
* (sp-8) word saved ds
* (sp-12) long saved ebp
* (sp-16) long saved ecx
* (sp-20) long saved edx
* (sp-24) long saved previous stack
*/
static void BuildCallFrom16Core( FILE *outfile, int reg_func, int thunk, int short_ret )
{
/* Function header */
if (thunk) function_header( outfile, "__wine_call_from_16_thunk" );
else if (reg_func) function_header( outfile, "__wine_call_from_16_regs" );
else if (short_ret) function_header( outfile, "__wine_call_from_16_word" );
else function_header( outfile, "__wine_call_from_16_long" );
/* Create STACK16FRAME (except STACK32FRAME link) */
fprintf( outfile, "\tpushw %%gs\n" );
fprintf( outfile, "\tpushw %%fs\n" );
fprintf( outfile, "\tpushw %%es\n" );
fprintf( outfile, "\tpushw %%ds\n" );
fprintf( outfile, "\tpushl %%ebp\n" );
fprintf( outfile, "\tpushl %%ecx\n" );
fprintf( outfile, "\tpushl %%edx\n" );
/* Save original EFlags register */
fprintf( outfile, "\tpushfl\n" );
if ( UsePIC )
{
/* Get Global Offset Table into %ecx */
fprintf( outfile, "\tcall 1f\n" );
fprintf( outfile, "1:\tpopl %%ecx\n" );
}
if (UsePIC)
fprintf( outfile, "\t.byte 0x2e\n\tmovl " PREFIX "CallTo16_DataSelector-1b(%%ecx),%%edx\n" );
else
fprintf( outfile, "\t.byte 0x2e\n\tmovl " PREFIX "CallTo16_DataSelector,%%edx\n" );
/* Load 32-bit segment registers */
#ifdef __svr4__
fprintf( outfile, "\tdata16\n");
#endif
fprintf( outfile, "\tmovw %%dx, %%ds\n" );
#ifdef __svr4__
fprintf( outfile, "\tdata16\n");
#endif
fprintf( outfile, "\tmovw %%dx, %%es\n" );
if ( UsePIC )
fprintf( outfile, "\tmovw " PREFIX "SYSLEVEL_Win16CurrentTeb-1b(%%ecx), %%fs\n" );
else
fprintf( outfile, "\tmovw " PREFIX "SYSLEVEL_Win16CurrentTeb, %%fs\n" );
/* Get address of wine_ldt_copy array into %ecx */
if ( UsePIC )
fprintf( outfile, "\tmovl wine_ldt_copy_ptr-1b(%%ecx), %%ecx\n" );
else
fprintf( outfile, "\tmovl $" PREFIX "wine_ldt_copy, %%ecx\n" );
/* Translate STACK16FRAME base to flat offset in %edx */
fprintf( outfile, "\tmovw %%ss, %%dx\n" );
fprintf( outfile, "\tandl $0xfff8, %%edx\n" );
fprintf( outfile, "\tshrl $1, %%edx\n" );
fprintf( outfile, "\tmovl (%%ecx,%%edx), %%edx\n" );
fprintf( outfile, "\tmovzwl %%sp, %%ebp\n" );
fprintf( outfile, "\tleal (%%ebp,%%edx), %%edx\n" );
/* Get saved flags into %ecx */
fprintf( outfile, "\tpopl %%ecx\n" );
/* Get the 32-bit stack pointer from the TEB and complete STACK16FRAME */
fprintf( outfile, "\t.byte 0x64\n\tmovl (%d), %%ebp\n", STACKOFFSET );
fprintf( outfile, "\tpushl %%ebp\n" );
/* Switch stacks */
#ifdef __svr4__
fprintf( outfile,"\tdata16\n");
#endif
fprintf( outfile, "\t.byte 0x64\n\tmovw %%ss, (%d)\n", STACKOFFSET + 2 );
fprintf( outfile, "\t.byte 0x64\n\tmovw %%sp, (%d)\n", STACKOFFSET );
fprintf( outfile, "\tpushl %%ds\n" );
fprintf( outfile, "\tpopl %%ss\n" );
fprintf( outfile, "\tmovl %%ebp, %%esp\n" );
fprintf( outfile, "\taddl $%d, %%ebp\n", STRUCTOFFSET(STACK32FRAME, ebp) );
/* At this point:
STACK16FRAME is completely set up
DS, ES, SS: flat data segment
FS: current TEB
ESP: points to last STACK32FRAME
EBP: points to ebp member of last STACK32FRAME
EDX: points to current STACK16FRAME
ECX: contains saved flags
all other registers: unchanged */
/* Special case: C16ThkSL stub */
if ( thunk )
{
/* Set up registers as expected and call thunk */
fprintf( outfile, "\tleal %lu(%%edx), %%ebx\n", sizeof(STACK16FRAME)-22 );
fprintf( outfile, "\tleal -4(%%esp), %%ebp\n" );
fprintf( outfile, "\tcall *%d(%%edx)\n", STACK16OFFSET(entry_point) );
/* Switch stack back */
fprintf( outfile, "\t.byte 0x64\n\tmovw (%d), %%ss\n", STACKOFFSET+2 );
fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%esp\n", STACKOFFSET );
fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
/* Restore registers and return directly to caller */
fprintf( outfile, "\taddl $8, %%esp\n" );
fprintf( outfile, "\tpopl %%ebp\n" );
fprintf( outfile, "\tpopw %%ds\n" );
fprintf( outfile, "\tpopw %%es\n" );
fprintf( outfile, "\tpopw %%fs\n" );
fprintf( outfile, "\tpopw %%gs\n" );
fprintf( outfile, "\taddl $20, %%esp\n" );
fprintf( outfile, "\txorb %%ch, %%ch\n" );
fprintf( outfile, "\tpopl %%ebx\n" );
fprintf( outfile, "\taddw %%cx, %%sp\n" );
fprintf( outfile, "\tpush %%ebx\n" );
fprintf( outfile, "\t.byte 0x66\n" );
fprintf( outfile, "\tlret\n" );
return;
}
/* Build register CONTEXT */
if ( reg_func )
{
fprintf( outfile, "\tsubl $%lu, %%esp\n", sizeof(CONTEXT86) );
fprintf( outfile, "\tmovl %%ecx, %d(%%esp)\n", CONTEXTOFFSET(EFlags) );
fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Eax) );
fprintf( outfile, "\tmovl %%ebx, %d(%%esp)\n", CONTEXTOFFSET(Ebx) );
fprintf( outfile, "\tmovl %%esi, %d(%%esp)\n", CONTEXTOFFSET(Esi) );
fprintf( outfile, "\tmovl %%edi, %d(%%esp)\n", CONTEXTOFFSET(Edi) );
fprintf( outfile, "\tmovl %d(%%edx), %%eax\n", STACK16OFFSET(ebp) );
fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Ebp) );
fprintf( outfile, "\tmovl %d(%%edx), %%eax\n", STACK16OFFSET(ecx) );
fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Ecx) );
fprintf( outfile, "\tmovl %d(%%edx), %%eax\n", STACK16OFFSET(edx) );
fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Edx) );
fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(ds) );
fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegDs) );
fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(es) );
fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegEs) );
fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(fs) );
fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegFs) );
fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(gs) );
fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegGs) );
fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(cs) );
fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegCs) );
fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(ip) );
fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Eip) );
fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%eax\n", STACKOFFSET+2 );
fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegSs) );
fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%eax\n", STACKOFFSET );
fprintf( outfile, "\taddl $%d, %%eax\n", STACK16OFFSET(ip) );
fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Esp) );
#if 0
fprintf( outfile, "\tfsave %d(%%esp)\n", CONTEXTOFFSET(FloatSave) );
#endif
/* Push address of CONTEXT86 structure -- popped by the relay routine */
fprintf( outfile, "\tpushl %%esp\n" );
}
/* Print debug info before call */
if ( debugging )
{
fprintf( outfile, "\tpushl %%edx\n" );
if ( reg_func )
fprintf( outfile, "\tleal -%lu(%%ebp), %%eax\n\tpushl %%eax\n",
sizeof(CONTEXT) + STRUCTOFFSET(STACK32FRAME, ebp) );
else
fprintf( outfile, "\tpushl $0\n" );
fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallFrom16\n ");
fprintf( outfile, "\tpopl %%edx\n" );
fprintf( outfile, "\tpopl %%edx\n" );
}
/* Call relay routine (which will call the API entry point) */
fprintf( outfile, "\tleal %lu(%%edx), %%eax\n", sizeof(STACK16FRAME) );
fprintf( outfile, "\tpushl %%eax\n" );
fprintf( outfile, "\tpushl %d(%%edx)\n", STACK16OFFSET(entry_point) );
fprintf( outfile, "\tcall *%d(%%edx)\n", STACK16OFFSET(relay) );
/* Print debug info after call */
if ( debugging )
{
fprintf( outfile, "\tpushl %%eax\n" );
if ( reg_func )
fprintf( outfile, "\tleal -%lu(%%ebp), %%eax\n\tpushl %%eax\n",
sizeof(CONTEXT) + STRUCTOFFSET(STACK32FRAME, ebp) );
else
fprintf( outfile, "\tpushl $0\n" );
fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallFrom16Ret\n ");
fprintf( outfile, "\tpopl %%eax\n" );
fprintf( outfile, "\tpopl %%eax\n" );
}
if ( reg_func )
{
fprintf( outfile, "\tmovl %%esp, %%ebx\n" );
/* Switch stack back */
fprintf( outfile, "\t.byte 0x64\n\tmovw (%d), %%ss\n", STACKOFFSET+2 );
fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%esp\n", STACKOFFSET );
fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
/* Get return address to CallFrom16 stub */
fprintf( outfile, "\taddw $%d, %%sp\n", STACK16OFFSET(callfrom_ip)-4 );
fprintf( outfile, "\tpopl %%eax\n" );
fprintf( outfile, "\tpopl %%edx\n" );
/* Restore all registers from CONTEXT */
fprintf( outfile, "\tmovw %d(%%ebx), %%ss\n", CONTEXTOFFSET(SegSs) );
fprintf( outfile, "\tmovl %d(%%ebx), %%esp\n", CONTEXTOFFSET(Esp) );
fprintf( outfile, "\taddl $4, %%esp\n" ); /* room for final return address */
fprintf( outfile, "\tpushw %d(%%ebx)\n", CONTEXTOFFSET(SegCs) );
fprintf( outfile, "\tpushw %d(%%ebx)\n", CONTEXTOFFSET(Eip) );
fprintf( outfile, "\tpushl %%edx\n" );
fprintf( outfile, "\tpushl %%eax\n" );
fprintf( outfile, "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(EFlags) );
fprintf( outfile, "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(SegDs) );
fprintf( outfile, "\tmovw %d(%%ebx), %%es\n", CONTEXTOFFSET(SegEs) );
fprintf( outfile, "\tmovw %d(%%ebx), %%fs\n", CONTEXTOFFSET(SegFs) );
fprintf( outfile, "\tmovw %d(%%ebx), %%gs\n", CONTEXTOFFSET(SegGs) );
fprintf( outfile, "\tmovl %d(%%ebx), %%ebp\n", CONTEXTOFFSET(Ebp) );
fprintf( outfile, "\tmovl %d(%%ebx), %%esi\n", CONTEXTOFFSET(Esi) );
fprintf( outfile, "\tmovl %d(%%ebx), %%edi\n", CONTEXTOFFSET(Edi) );
fprintf( outfile, "\tmovl %d(%%ebx), %%eax\n", CONTEXTOFFSET(Eax) );
fprintf( outfile, "\tmovl %d(%%ebx), %%edx\n", CONTEXTOFFSET(Edx) );
fprintf( outfile, "\tmovl %d(%%ebx), %%ecx\n", CONTEXTOFFSET(Ecx) );
fprintf( outfile, "\tmovl %d(%%ebx), %%ebx\n", CONTEXTOFFSET(Ebx) );
fprintf( outfile, "\tpopl %%ds\n" );
fprintf( outfile, "\tpopfl\n" );
fprintf( outfile, "\tlret\n" );
}
else
{
/* Switch stack back */
fprintf( outfile, "\t.byte 0x64\n\tmovw (%d), %%ss\n", STACKOFFSET+2 );
fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%esp\n", STACKOFFSET );
fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
/* Restore registers */
fprintf( outfile, "\tpopl %%edx\n" );
fprintf( outfile, "\tpopl %%ecx\n" );
fprintf( outfile, "\tpopl %%ebp\n" );
fprintf( outfile, "\tpopw %%ds\n" );
fprintf( outfile, "\tpopw %%es\n" );
fprintf( outfile, "\tpopw %%fs\n" );
fprintf( outfile, "\tpopw %%gs\n" );
/* Prepare return value and set flags accordingly */
if ( !short_ret )
fprintf( outfile, "\tshldl $16, %%eax, %%edx\n" );
fprintf( outfile, "\torl %%eax, %%eax\n" );
/* Return to return stub which will return to caller */
fprintf( outfile, "\tlret $12\n" );
}
}
