/* * Relay calls helper routines * * Copyright 1993 Robert J. Amstadt * Copyright 1995 Martin von Loewis * Copyright 1995, 1996, 1997 Alexandre Julliard * Copyright 1997 Eric Youngdale * Copyright 1999 Ulrich Weigand */ #include #include #include "winnt.h" #include "thread.h" #include "stackframe.h" #include "build.h" /******************************************************************* * 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 ) { char *name = thunk? "Thunk" : reg_func? "Register" : short_ret? "Word" : "Long"; /* Function header */ fprintf( outfile, "\n\t.align 4\n" ); #ifdef USE_STABS fprintf( outfile, ".stabs \"CallFrom16%s:F1\",36,0,0," PREFIX "CallFrom16%s\n", name, name); #endif fprintf( outfile, "\t.type " PREFIX "CallFrom16%s,@function\n", name ); fprintf( outfile, "\t.globl " PREFIX "CallFrom16%s\n", name ); fprintf( outfile, PREFIX "CallFrom16%s:\n", name ); /* 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 .LCallFrom16%s.getgot1\n", name ); fprintf( outfile, ".LCallFrom16%s.getgot1:\n", name ); fprintf( outfile, "\tpopl %%ecx\n" ); fprintf( outfile, "\taddl $_GLOBAL_OFFSET_TABLE_+[.-.LCallFrom16%s.getgot1], %%ecx\n", name ); } /* Load 32-bit segment registers */ fprintf( outfile, "\tmovw $0x%04x, %%dx\n", data_selector ); #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, "\tmovl " PREFIX "SYSLEVEL_Win16CurrentTeb@GOT(%%ecx), %%edx\n" ); fprintf( outfile, "\tmovw (%%edx), %%fs\n" ); } else fprintf( outfile, "\tmovw " PREFIX "SYSLEVEL_Win16CurrentTeb, %%fs\n" ); /* Get address of ldt_copy array into %ecx */ if ( UsePIC ) fprintf( outfile, "\tmovl " PREFIX "ldt_copy@GOT(%%ecx), %%ecx\n" ); else fprintf( outfile, "\tmovl $" PREFIX "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, "\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 %d(%%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\tlssw (%d), %%sp\n", STACKOFFSET ); */ fprintf( outfile, "\t.byte 0x64,0x66,0x0f,0xb2,0x25\n\t.long %d\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 $%d, %%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 ) { if ( UsePIC ) { fprintf( outfile, "\tpushl %%ebx\n" ); /* Get Global Offset Table into %ebx (for PLT call) */ fprintf( outfile, "\tcall .LCallFrom16%s.getgot2\n", name ); fprintf( outfile, ".LCallFrom16%s.getgot2:\n", name ); fprintf( outfile, "\tpopl %%ebx\n" ); fprintf( outfile, "\taddl $_GLOBAL_OFFSET_TABLE_+[.-.LCallFrom16%s.getgot2], %%ebx\n", name ); } fprintf( outfile, "\tpushl %%edx\n" ); if ( reg_func ) fprintf( outfile, "\tleal -%d(%%ebp), %%eax\n\tpushl %%eax\n", sizeof(CONTEXT) + STRUCTOFFSET(STACK32FRAME, ebp) ); else fprintf( outfile, "\tpushl $0\n" ); if ( UsePIC ) fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallFrom16@PLT\n "); else fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallFrom16\n "); fprintf( outfile, "\tpopl %%edx\n" ); fprintf( outfile, "\tpopl %%edx\n" ); if ( UsePIC ) fprintf( outfile, "\tpopl %%ebx\n" ); } /* Call relay routine (which will call the API entry point) */ fprintf( outfile, "\tleal %d(%%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 ) { if ( UsePIC ) { fprintf( outfile, "\tpushl %%ebx\n" ); /* Get Global Offset Table into %ebx (for PLT call) */ fprintf( outfile, "\tcall .LCallFrom16%s.getgot3\n", name ); fprintf( outfile, ".LCallFrom16%s.getgot3:\n", name ); fprintf( outfile, "\tpopl %%ebx\n" ); fprintf( outfile, "\taddl $_GLOBAL_OFFSET_TABLE_+[.-.LCallFrom16%s.getgot3], %%ebx\n", name ); } fprintf( outfile, "\tpushl %%eax\n" ); if ( reg_func ) fprintf( outfile, "\tleal -%d(%%ebp), %%eax\n\tpushl %%eax\n", sizeof(CONTEXT) + STRUCTOFFSET(STACK32FRAME, ebp) ); else fprintf( outfile, "\tpushl $0\n" ); if ( UsePIC ) fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallFrom16Ret@PLT\n "); else fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallFrom16Ret\n "); fprintf( outfile, "\tpopl %%eax\n" ); fprintf( outfile, "\tpopl %%eax\n" ); if ( UsePIC ) fprintf( outfile, "\tpopl %%ebx\n" ); } if ( reg_func ) { fprintf( outfile, "\tmovl %%esp, %%ebx\n" ); /* Switch stack back */ /* fprintf( outfile, "\t.byte 0x64\n\tlssw (%d), %%sp\n", STACKOFFSET ); */ fprintf( outfile, "\t.byte 0x64,0x66,0x0f,0xb2,0x25\n\t.long %d\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\tlssw (%d), %%sp\n", STACKOFFSET ); */ fprintf( outfile, "\t.byte 0x64,0x66,0x0f,0xb2,0x25\n\t.long %d\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" ); } } /******************************************************************* * BuildCallTo16Core * * This routine builds the core routines used in 32->16 thunks: * * extern void CALLBACK CallTo16Word( SEGPTR target, int nb_args ); * extern void CALLBACK CallTo16Long( SEGPTR target, int nb_args ); * extern void CALLBACK CallTo16RegisterShort( const CONTEXT86 *context, int nb_args ); * extern void CALLBACK CallTo16RegisterLong ( const CONTEXT86 *context, int nb_args ); * * These routines can be called directly from 32-bit code. * * All routines expect that the 16-bit stack contents (arguments) were * already set up by the caller; nb_args must contain the number of bytes * to be conserved. The 16-bit SS:SP will be set accordinly. * * All other registers are either taken from the CONTEXT86 structure * or else set to default values. The target routine address is either * given directly or taken from the CONTEXT86. * * If you want to call a 16-bit routine taking only standard argument types * (WORD and LONG), you can also have an appropriate argument conversion * stub automatically generated (see BuildCallTo16); you'd then call this * stub, which in turn would prepare the 16-bit stack and call the appropiate * core routine. * */ static void BuildCallTo16Core( FILE *outfile, int short_ret, int reg_func ) { char *name = reg_func == 2 ? "RegisterLong" : reg_func == 1 ? "RegisterShort" : short_ret? "Word" : "Long"; /* Function header */ fprintf( outfile, "\n\t.align 4\n" ); #ifdef USE_STABS fprintf( outfile, ".stabs \"CallTo16%s:F1\",36,0,0," PREFIX "CallTo16%s\n", name, name); #endif fprintf( outfile, "\t.type " PREFIX "CallTo16%s,@function\n", name ); fprintf( outfile, "\t.globl " PREFIX "CallTo16%s\n", name ); fprintf( outfile, PREFIX "CallTo16%s:\n", name ); /* Function entry sequence */ fprintf( outfile, "\tpushl %%ebp\n" ); fprintf( outfile, "\tmovl %%esp, %%ebp\n" ); /* Save the 32-bit registers */ fprintf( outfile, "\tpushl %%ebx\n" ); fprintf( outfile, "\tpushl %%ecx\n" ); fprintf( outfile, "\tpushl %%edx\n" ); fprintf( outfile, "\tpushl %%esi\n" ); fprintf( outfile, "\tpushl %%edi\n" ); if ( UsePIC ) { /* Get Global Offset Table into %ebx */ fprintf( outfile, "\tcall .LCallTo16%s.getgot1\n", name ); fprintf( outfile, ".LCallTo16%s.getgot1:\n", name ); fprintf( outfile, "\tpopl %%ebx\n" ); fprintf( outfile, "\taddl $_GLOBAL_OFFSET_TABLE_+[.-.LCallTo16%s.getgot1], %%ebx\n", name ); } /* Enter Win16 Mutex */ if ( UsePIC ) fprintf( outfile, "\tcall " PREFIX "SYSLEVEL_EnterWin16Lock@PLT\n" ); else fprintf( outfile, "\tcall " PREFIX "SYSLEVEL_EnterWin16Lock\n" ); /* Print debugging info */ if (debugging) { /* Push flags, number of arguments, and target */ fprintf( outfile, "\tpushl $%d\n", reg_func ); fprintf( outfile, "\tpushl 12(%%ebp)\n" ); fprintf( outfile, "\tpushl 8(%%ebp)\n" ); if ( UsePIC ) fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallTo16@PLT\n" ); else fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallTo16\n" ); fprintf( outfile, "\taddl $12, %%esp\n" ); } /* Get return address */ if ( UsePIC ) { fprintf( outfile, "\tmovl " PREFIX "CallTo16_RetAddr@GOT(%%ebx), %%ecx\n" ); fprintf( outfile, "\tmovl " PREFIX "(%%ecx), %%ecx\n" ); } else fprintf( outfile, "\tmovl " PREFIX "CallTo16_RetAddr, %%ecx\n" ); /* Call the actual CallTo16 routine (simulate a lcall) */ fprintf( outfile, "\tpushl %%cs\n" ); fprintf( outfile, "\tcall .LCallTo16%s\n", name ); if ( !reg_func ) { /* Convert and push return value */ if ( short_ret ) { fprintf( outfile, "\tmovzwl %%ax, %%eax\n" ); fprintf( outfile, "\tpushl %%eax\n" ); } else { fprintf( outfile, "\tshll $16,%%edx\n" ); fprintf( outfile, "\tmovw %%ax,%%dx\n" ); fprintf( outfile, "\tpushl %%edx\n" ); } } else { /* * Modify CONTEXT86 structure to contain new values * * NOTE: We restore only EAX, EBX, EDX, EDX, EBP, and ESP. * The segment registers as well as ESI and EDI should * not be modified by a well-behaved 16-bit routine in * any case. [If necessary, we could restore them as well, * at the cost of a somewhat less efficient return path.] */ fprintf( outfile, "\tmovl %d(%%esp), %%edi\n", STACK32OFFSET(target)-12 ); fprintf( outfile, "\tmovl %%eax, %d(%%edi)\n", CONTEXTOFFSET(Eax) ); fprintf( outfile, "\tmovl %%ebx, %d(%%edi)\n", CONTEXTOFFSET(Ebx) ); fprintf( outfile, "\tmovl %%ecx, %d(%%edi)\n", CONTEXTOFFSET(Ecx) ); fprintf( outfile, "\tmovl %%edx, %d(%%edi)\n", CONTEXTOFFSET(Edx) ); fprintf( outfile, "\tmovl %%ebp, %d(%%edi)\n", CONTEXTOFFSET(Ebp) ); fprintf( outfile, "\tmovl %%esi, %d(%%edi)\n", CONTEXTOFFSET(Esp) ); /* The return glue code saved %esp into %esi */ fprintf( outfile, "\tpushl %%edi\n" ); } if ( UsePIC ) { /* Get Global Offset Table into %ebx (might have been overwritten) */ fprintf( outfile, "\tcall .LCallTo16%s.getgot2\n", name ); fprintf( outfile, ".LCallTo16%s.getgot2:\n", name ); fprintf( outfile, "\tpopl %%ebx\n" ); fprintf( outfile, "\taddl $_GLOBAL_OFFSET_TABLE_+[.-.LCallTo16%s.getgot2], %%ebx\n", name ); } /* Print debugging info */ if (debugging) { fprintf( outfile, "\tpushl $%d\n", reg_func ); if ( UsePIC ) fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallTo16Ret@PLT\n" ); else fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallTo16Ret\n" ); fprintf( outfile, "\taddl $4, %%esp\n" ); } /* Leave Win16 Mutex */ if ( UsePIC ) fprintf( outfile, "\tcall " PREFIX "SYSLEVEL_LeaveWin16Lock@PLT\n" ); else fprintf( outfile, "\tcall " PREFIX "SYSLEVEL_LeaveWin16Lock\n" ); /* Get return value */ fprintf( outfile, "\tpopl %%eax\n" ); /* Restore the 32-bit registers */ fprintf( outfile, "\tpopl %%edi\n" ); fprintf( outfile, "\tpopl %%esi\n" ); fprintf( outfile, "\tpopl %%edx\n" ); fprintf( outfile, "\tpopl %%ecx\n" ); fprintf( outfile, "\tpopl %%ebx\n" ); /* Function exit sequence */ fprintf( outfile, "\tpopl %%ebp\n" ); fprintf( outfile, "\tret $8\n" ); /* Start of the actual CallTo16 routine */ fprintf( outfile, ".LCallTo16%s:\n", name ); /* Complete STACK32FRAME */ fprintf( outfile, "\t.byte 0x64\n\tpushl (%d)\n", STACKOFFSET ); fprintf( outfile, "\tmovl %%esp,%%edx\n" ); /* Switch to the 16-bit stack */ #ifdef __svr4__ fprintf( outfile,"\tdata16\n"); #endif fprintf( outfile, "\t.byte 0x64\n\tmovw (%d),%%ss\n", STACKOFFSET + 2); fprintf( outfile, "\t.byte 0x64\n\tmovw (%d),%%sp\n", STACKOFFSET ); fprintf( outfile, "\t.byte 0x64\n\tmovl %%edx,(%d)\n", STACKOFFSET ); /* Make %bp point to the previous stackframe (built by CallFrom16) */ fprintf( outfile, "\tmovzwl %%sp,%%ebp\n" ); fprintf( outfile, "\tleal %d(%%ebp),%%ebp\n", STACK16OFFSET(bp) ); /* Add the specified offset to the new sp */ fprintf( outfile, "\tsubw %d(%%edx), %%sp\n", STACK32OFFSET(nb_args) ); /* Push the return address * With sreg suffix, we push 16:16 address (normal lret) * With lreg suffix, we push 16:32 address (0x66 lret, for KERNEL32_45) */ if (reg_func != 2) fprintf( outfile, "\tpushl %%ecx\n" ); else { fprintf( outfile, "\tshldl $16, %%ecx, %%eax\n" ); fprintf( outfile, "\tpushw $0\n" ); fprintf( outfile, "\tpushw %%ax\n" ); fprintf( outfile, "\tpushw $0\n" ); fprintf( outfile, "\tpushw %%cx\n" ); } if (reg_func) { /* Push the called routine address */ fprintf( outfile, "\tmovl %d(%%edx),%%edx\n", STACK32OFFSET(target) ); fprintf( outfile, "\tpushw %d(%%edx)\n", CONTEXTOFFSET(SegCs) ); fprintf( outfile, "\tpushw %d(%%edx)\n", CONTEXTOFFSET(Eip) ); /* Get the registers */ fprintf( outfile, "\tpushw %d(%%edx)\n", CONTEXTOFFSET(SegDs) ); fprintf( outfile, "\tmovl %d(%%edx),%%eax\n", CONTEXTOFFSET(SegEs) ); fprintf( outfile, "\tmovw %%ax,%%es\n" ); fprintf( outfile, "\tmovl %d(%%edx),%%eax\n", CONTEXTOFFSET(SegFs) ); fprintf( outfile, "\tmovw %%ax,%%fs\n" ); fprintf( outfile, "\tmovl %d(%%edx),%%ebp\n", CONTEXTOFFSET(Ebp) ); fprintf( outfile, "\tmovl %d(%%edx),%%esi\n", CONTEXTOFFSET(Esi) ); fprintf( outfile, "\tmovl %d(%%edx),%%edi\n", CONTEXTOFFSET(Edi) ); fprintf( outfile, "\tmovl %d(%%edx),%%eax\n", CONTEXTOFFSET(Eax) ); fprintf( outfile, "\tmovl %d(%%edx),%%ebx\n", CONTEXTOFFSET(Ebx) ); fprintf( outfile, "\tmovl %d(%%edx),%%ecx\n", CONTEXTOFFSET(Ecx) ); fprintf( outfile, "\tmovl %d(%%edx),%%edx\n", CONTEXTOFFSET(Edx) ); /* Get the 16-bit ds */ fprintf( outfile, "\tpopw %%ds\n" ); } else /* not a register function */ { /* Push the called routine address */ fprintf( outfile, "\tpushl %d(%%edx)\n", STACK32OFFSET(target) ); /* Set %fs to the value saved by the last CallFrom16 */ fprintf( outfile, "\tmovw %d(%%ebp),%%ax\n", STACK16OFFSET(fs)-STACK16OFFSET(bp) ); fprintf( outfile, "\tmovw %%ax,%%fs\n" ); /* Set %ds and %es (and %ax just in case) equal to %ss */ fprintf( outfile, "\tmovw %%ss,%%ax\n" ); fprintf( outfile, "\tmovw %%ax,%%ds\n" ); fprintf( outfile, "\tmovw %%ax,%%es\n" ); } /* Jump to the called routine */ fprintf( outfile, "\t.byte 0x66\n" ); fprintf( outfile, "\tlret\n" ); } /******************************************************************* * BuildRet16Func * * Build the return code for 16-bit callbacks */ static void BuildRet16Func( FILE *outfile ) { /* * Note: This must reside in the .data section to allow * run-time relocation of the SYSLEVEL_Win16CurrentTeb symbol */ fprintf( outfile, "\n\t.type " PREFIX "CallTo16_Ret,@function\n" ); fprintf( outfile, "\t.globl " PREFIX "CallTo16_Ret\n" ); fprintf( outfile, PREFIX "CallTo16_Ret:\n" ); /* Save %esp into %esi */ fprintf( outfile, "\tmovl %%esp,%%esi\n" ); /* Restore 32-bit segment registers */ fprintf( outfile, "\tmovw $0x%04x,%%di\n", data_selector ); #ifdef __svr4__ fprintf( outfile, "\tdata16\n"); #endif fprintf( outfile, "\tmovw %%di,%%ds\n" ); #ifdef __svr4__ fprintf( outfile, "\tdata16\n"); #endif fprintf( outfile, "\tmovw %%di,%%es\n" ); fprintf( outfile, "\tmovw " PREFIX "SYSLEVEL_Win16CurrentTeb,%%fs\n" ); /* Restore the 32-bit stack */ #ifdef __svr4__ fprintf( outfile, "\tdata16\n"); #endif fprintf( outfile, "\tmovw %%di,%%ss\n" ); fprintf( outfile, "\t.byte 0x64\n\tmovl (%d),%%esp\n", STACKOFFSET ); fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET ); /* Return to caller */ fprintf( outfile, "\tlret\n" ); /* Declare the return address variable */ fprintf( outfile, "\n\t.globl " PREFIX "CallTo16_RetAddr\n" ); fprintf( outfile, PREFIX "CallTo16_RetAddr:\t.long 0\n" ); } /******************************************************************* * BuildCallTo32CBClient * * Call a CBClient relay stub from 32-bit code (KERNEL.620). * * Since the relay stub is itself 32-bit, this should not be a problem; * unfortunately, the relay stubs are expected to switch back to a * 16-bit stack (and 16-bit code) after completion :-( * * This would conflict with our 16- vs. 32-bit stack handling, so * we simply switch *back* to our 32-bit stack before returning to * the caller ... * * The CBClient relay stub expects to be called with the following * 16-bit stack layout, and with ebp and ebx pointing into the 16-bit * stack at the designated places: * * ... * (ebp+14) original arguments to the callback routine * (ebp+10) far return address to original caller * (ebp+6) Thunklet target address * (ebp+2) Thunklet relay ID code * (ebp) BP (saved by CBClientGlueSL) * (ebp-2) SI (saved by CBClientGlueSL) * (ebp-4) DI (saved by CBClientGlueSL) * (ebp-6) DS (saved by CBClientGlueSL) * * ... buffer space used by the 16-bit side glue for temp copies * * (ebx+4) far return address to 16-bit side glue code * (ebx) saved 16-bit ss:sp (pointing to ebx+4) * * The 32-bit side glue code accesses both the original arguments (via ebp) * and the temporary copies prepared by the 16-bit side glue (via ebx). * After completion, the stub will load ss:sp from the buffer at ebx * and perform a far return to 16-bit code. * * To trick the relay stub into returning to us, we replace the 16-bit * return address to the glue code by a cs:ip pair pointing to our * return entry point (the original return address is saved first). * Our return stub thus called will then reload the 32-bit ss:esp and * return to 32-bit code (by using and ss:esp value that we have also * pushed onto the 16-bit stack before and a cs:eip values found at * that position on the 32-bit stack). The ss:esp to be restored is * found relative to the 16-bit stack pointer at: * * (ebx-4) ss (flat) * (ebx-8) sp (32-bit stack pointer) * * The second variant of this routine, CALL32_CBClientEx, which is used * to implement KERNEL.621, has to cope with yet another problem: Here, * the 32-bit side directly returns to the caller of the CBClient thunklet, * restoring registers saved by CBClientGlueSL and cleaning up the stack. * As we have to return to our 32-bit code first, we have to adapt the * layout of our temporary area so as to include values for the registers * that are to be restored, and later (in the implementation of KERNEL.621) * we *really* restore them. The return stub restores DS, DI, SI, and BP * from the stack, skips the next 8 bytes (CBClient relay code / target), * and then performs a lret NN, where NN is the number of arguments to be * removed. Thus, we prepare our temporary area as follows: * * (ebx+22) 16-bit cs (this segment) * (ebx+20) 16-bit ip ('16-bit' return entry point) * (ebx+16) 32-bit ss (flat) * (ebx+12) 32-bit sp (32-bit stack pointer) * (ebx+10) 16-bit bp (points to ebx+24) * (ebx+8) 16-bit si (ignored) * (ebx+6) 16-bit di (ignored) * (ebx+4) 16-bit ds (we actually use the flat DS here) * (ebx+2) 16-bit ss (16-bit stack segment) * (ebx+0) 16-bit sp (points to ebx+4) * * Note that we ensure that DS is not changed and remains the flat segment, * and the 32-bit stack pointer our own return stub needs fits just * perfectly into the 8 bytes that are skipped by the Windows stub. * One problem is that we have to determine the number of removed arguments, * as these have to be really removed in KERNEL.621. Thus, the BP value * that we place in the temporary area to be restored, contains the value * that SP would have if no arguments were removed. By comparing the actual * value of SP with this value in our return stub we can compute the number * of removed arguments. This is then returned to KERNEL.621. * * The stack layout of this function: * (ebp+20) nArgs pointer to variable receiving nr. of args (Ex only) * (ebp+16) esi pointer to caller's esi value * (ebp+12) arg ebp value to be set for relay stub * (ebp+8) func CBClient relay stub address * (ebp+4) ret addr * (ebp) ebp */ static void BuildCallTo32CBClient( FILE *outfile, BOOL isEx ) { char *name = isEx? "CBClientEx" : "CBClient"; int size = isEx? 24 : 12; /* Function header */ fprintf( outfile, "\n\t.align 4\n" ); #ifdef USE_STABS fprintf( outfile, ".stabs \"CALL32_%s:F1\",36,0,0," PREFIX "CALL32_%s\n", name, name ); #endif fprintf( outfile, "\t.globl " PREFIX "CALL32_%s\n", name ); fprintf( outfile, PREFIX "CALL32_%s:\n", name ); /* Entry code */ fprintf( outfile, "\tpushl %%ebp\n" ); fprintf( outfile, "\tmovl %%esp,%%ebp\n" ); fprintf( outfile, "\tpushl %%edi\n" ); fprintf( outfile, "\tpushl %%esi\n" ); fprintf( outfile, "\tpushl %%ebx\n" ); /* Get the 16-bit stack */ fprintf( outfile, "\t.byte 0x64\n\tmovl (%d),%%ebx\n", STACKOFFSET); /* Convert it to a flat address */ fprintf( outfile, "\tshldl $16,%%ebx,%%eax\n" ); fprintf( outfile, "\tandl $0xfff8,%%eax\n" ); fprintf( outfile, "\tmovl " PREFIX "ldt_copy(%%eax),%%esi\n" ); fprintf( outfile, "\tmovw %%bx,%%ax\n" ); fprintf( outfile, "\taddl %%eax,%%esi\n" ); /* Allocate temporary area (simulate STACK16_PUSH) */ fprintf( outfile, "\tpushf\n" ); fprintf( outfile, "\tcld\n" ); fprintf( outfile, "\tleal -%d(%%esi), %%edi\n", size ); fprintf( outfile, "\tmovl $%d, %%ecx\n", sizeof(STACK16FRAME) ); fprintf( outfile, "\trep\n\tmovsb\n" ); fprintf( outfile, "\tpopf\n" ); fprintf( outfile, "\t.byte 0x64\n\tsubw $%d,(%d)\n", size, STACKOFFSET ); fprintf( outfile, "\tpushl %%edi\n" ); /* remember address */ /* Set up temporary area */ if ( !isEx ) { fprintf( outfile, "\tleal 4(%%edi), %%edi\n" ); fprintf( outfile, "\tleal -8(%%esp), %%eax\n" ); fprintf( outfile, "\tmovl %%eax, -8(%%edi)\n" ); /* 32-bit sp */ fprintf( outfile, "\tmovw %%ss, %%ax\n" ); fprintf( outfile, "\tandl $0x0000ffff, %%eax\n" ); fprintf( outfile, "\tmovl %%eax, -4(%%edi)\n" ); /* 32-bit ss */ fprintf( outfile, "\taddl $%d, %%ebx\n", sizeof(STACK16FRAME)-size+4 + 4 ); fprintf( outfile, "\tmovl %%ebx, 0(%%edi)\n" ); /* 16-bit ss:sp */ fprintf( outfile, "\tmovl " PREFIX "CALL32_%s_RetAddr, %%eax\n", name ); fprintf( outfile, "\tmovl %%eax, 4(%%edi)\n" ); /* overwrite return address */ } else { fprintf( outfile, "\taddl $%d, %%ebx\n", sizeof(STACK16FRAME)-size+4 ); fprintf( outfile, "\tmovl %%ebx, 0(%%edi)\n" ); fprintf( outfile, "\tmovw %%ds, %%ax\n" ); fprintf( outfile, "\tmovw %%ax, 4(%%edi)\n" ); fprintf( outfile, "\taddl $20, %%ebx\n" ); fprintf( outfile, "\tmovw %%bx, 10(%%edi)\n" ); fprintf( outfile, "\tleal -8(%%esp), %%eax\n" ); fprintf( outfile, "\tmovl %%eax, 12(%%edi)\n" ); fprintf( outfile, "\tmovw %%ss, %%ax\n" ); fprintf( outfile, "\tandl $0x0000ffff, %%eax\n" ); fprintf( outfile, "\tmovl %%eax, 16(%%edi)\n" ); fprintf( outfile, "\tmovl " PREFIX "CALL32_%s_RetAddr, %%eax\n", name ); fprintf( outfile, "\tmovl %%eax, 20(%%edi)\n" ); } /* Set up registers and call CBClient relay stub (simulating a far call) */ fprintf( outfile, "\tmovl 16(%%ebp), %%esi\n" ); fprintf( outfile, "\tmovl (%%esi), %%esi\n" ); fprintf( outfile, "\tmovl %%edi, %%ebx\n" ); fprintf( outfile, "\tmovl 8(%%ebp), %%eax\n" ); fprintf( outfile, "\tmovl 12(%%ebp), %%ebp\n" ); fprintf( outfile, "\tpushl %%cs\n" ); fprintf( outfile, "\tcall *%%eax\n" ); /* Return new esi value to caller */ fprintf( outfile, "\tmovl 32(%%esp), %%edi\n" ); fprintf( outfile, "\tmovl %%esi, (%%edi)\n" ); /* Cleanup temporary area (simulate STACK16_POP) */ fprintf( outfile, "\tpop %%esi\n" ); fprintf( outfile, "\tpushf\n" ); fprintf( outfile, "\tstd\n" ); fprintf( outfile, "\tdec %%esi\n" ); fprintf( outfile, "\tleal %d(%%esi), %%edi\n", size ); fprintf( outfile, "\tmovl $%d, %%ecx\n", sizeof(STACK16FRAME) ); fprintf( outfile, "\trep\n\tmovsb\n" ); fprintf( outfile, "\tpopf\n" ); fprintf( outfile, "\t.byte 0x64\n\taddw $%d,(%d)\n", size, STACKOFFSET ); /* Return argument size to caller */ if ( isEx ) { fprintf( outfile, "\tmovl 32(%%esp), %%ebx\n" ); fprintf( outfile, "\tmovl %%ebp, (%%ebx)\n" ); } /* Restore registers and return */ fprintf( outfile, "\tpopl %%ebx\n" ); fprintf( outfile, "\tpopl %%esi\n" ); fprintf( outfile, "\tpopl %%edi\n" ); fprintf( outfile, "\tpopl %%ebp\n" ); fprintf( outfile, "\tret\n" ); } static void BuildCallTo32CBClientRet( FILE *outfile, BOOL isEx ) { char *name = isEx? "CBClientEx" : "CBClient"; /* '16-bit' return stub */ fprintf( outfile, "\n\t.globl " PREFIX "CALL32_%s_Ret\n", name ); fprintf( outfile, PREFIX "CALL32_%s_Ret:\n", name ); if ( !isEx ) { fprintf( outfile, "\tmovzwl %%sp, %%ebx\n" ); fprintf( outfile, "\tlssl %%ss:-16(%%ebx), %%esp\n" ); } else { fprintf( outfile, "\tmovzwl %%bp, %%ebx\n" ); fprintf( outfile, "\tsubw %%bp, %%sp\n" ); fprintf( outfile, "\tmovzwl %%sp, %%ebp\n" ); fprintf( outfile, "\tlssl %%ss:-12(%%ebx), %%esp\n" ); } fprintf( outfile, "\tlret\n" ); /* Declare the return address variable */ fprintf( outfile, "\n\t.globl " PREFIX "CALL32_%s_RetAddr\n", name ); fprintf( outfile, PREFIX "CALL32_%s_RetAddr:\t.long 0\n", name ); } /******************************************************************* * BuildCallFrom32Regs * * Build a 32-bit-to-Wine call-back function for a 'register' function. * 'args' is the number of dword arguments. * * Stack layout: * ... * (ebp+12) first arg * (ebp+8) ret addr to user code * (ebp+4) ret addr to relay code * (ebp+0) saved ebp * (ebp-128) buffer area to allow stack frame manipulation * (ebp-332) CONTEXT86 struct * (ebp-336) CONTEXT86 *argument * .... other arguments copied from (ebp+12) * * The entry point routine is called with a CONTEXT* extra argument, * following the normal args. In this context structure, EIP_reg * contains the return address to user code, and ESP_reg the stack * pointer on return (with the return address and arguments already * removed). */ static void BuildCallFrom32Regs( FILE *outfile ) { static const int STACK_SPACE = 128 + sizeof(CONTEXT86); /* Function header */ fprintf( outfile, "\n\t.align 4\n" ); #ifdef USE_STABS fprintf( outfile, ".stabs \"CALL32_Regs:F1\",36,0,0," PREFIX "CALL32_Regs\n" ); #endif fprintf( outfile, "\t.globl " PREFIX "CALL32_Regs\n" ); fprintf( outfile, PREFIX "CALL32_Regs:\n" ); /* Allocate some buffer space on the stack */ fprintf( outfile, "\tpushl %%ebp\n" ); fprintf( outfile, "\tmovl %%esp,%%ebp\n "); fprintf( outfile, "\tleal -%d(%%esp), %%esp\n", STACK_SPACE ); /* Build the context structure */ fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Eax) - STACK_SPACE ); fprintf( outfile, "\tpushfl\n" ); fprintf( outfile, "\tpopl %%eax\n" ); fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(EFlags) - STACK_SPACE ); fprintf( outfile, "\tmovl 0(%%ebp),%%eax\n" ); fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Ebp) - STACK_SPACE ); fprintf( outfile, "\tmovl %%ebx,%d(%%ebp)\n", CONTEXTOFFSET(Ebx) - STACK_SPACE ); fprintf( outfile, "\tmovl %%ecx,%d(%%ebp)\n", CONTEXTOFFSET(Ecx) - STACK_SPACE ); fprintf( outfile, "\tmovl %%edx,%d(%%ebp)\n", CONTEXTOFFSET(Edx) - STACK_SPACE ); fprintf( outfile, "\tmovl %%esi,%d(%%ebp)\n", CONTEXTOFFSET(Esi) - STACK_SPACE ); fprintf( outfile, "\tmovl %%edi,%d(%%ebp)\n", CONTEXTOFFSET(Edi) - STACK_SPACE ); fprintf( outfile, "\txorl %%eax,%%eax\n" ); fprintf( outfile, "\tmovw %%cs,%%ax\n" ); fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegCs) - STACK_SPACE ); fprintf( outfile, "\tmovw %%es,%%ax\n" ); fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegEs) - STACK_SPACE ); fprintf( outfile, "\tmovw %%fs,%%ax\n" ); fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegFs) - STACK_SPACE ); fprintf( outfile, "\tmovw %%gs,%%ax\n" ); fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegGs) - STACK_SPACE ); fprintf( outfile, "\tmovw %%ss,%%ax\n" ); fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegSs) - STACK_SPACE ); fprintf( outfile, "\tmovw %%ds,%%ax\n" ); fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegDs) - STACK_SPACE ); fprintf( outfile, "\tmovw %%ax,%%es\n" ); /* set %es equal to %ds just in case */ fprintf( outfile, "\tmovl $0x%x,%%eax\n", CONTEXT86_FULL ); fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(ContextFlags) - STACK_SPACE ); fprintf( outfile, "\tmovl 8(%%ebp),%%eax\n" ); /* Get %eip at time of call */ fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Eip) - STACK_SPACE ); /* Transfer the arguments */ fprintf( outfile, "\tmovl 4(%%ebp),%%ebx\n" ); /* get relay code addr */ fprintf( outfile, "\tpushl %%esp\n" ); /* push ptr to context struct */ fprintf( outfile, "\tmovzbl 4(%%ebx),%%ecx\n" ); /* fetch number of args to copy */ fprintf( outfile, "\tjecxz 1f\n" ); fprintf( outfile, "\tsubl %%ecx,%%esp\n" ); fprintf( outfile, "\tleal 12(%%ebp),%%esi\n" ); /* get %esp at time of call */ fprintf( outfile, "\tmovl %%esp,%%edi\n" ); fprintf( outfile, "\tshrl $2,%%ecx\n" ); fprintf( outfile, "\tcld\n" ); fprintf( outfile, "\trep\n\tmovsl\n" ); /* copy args */ fprintf( outfile, "1:\tmovzbl 5(%%ebx),%%eax\n" ); /* fetch number of args to remove */ fprintf( outfile, "\tleal 12(%%ebp,%%eax),%%eax\n" ); fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Esp) - STACK_SPACE ); /* Call the entry point */ fprintf( outfile, "\tcall *0(%%ebx)\n" ); /* Store %eip and %ebp onto the new stack */ fprintf( outfile, "\tmovl %d(%%ebp),%%edx\n", CONTEXTOFFSET(Esp) - STACK_SPACE ); fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(Eip) - STACK_SPACE ); fprintf( outfile, "\tmovl %%eax,-4(%%edx)\n" ); fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(Ebp) - STACK_SPACE ); fprintf( outfile, "\tmovl %%eax,-8(%%edx)\n" ); /* Restore the context structure */ /* Note: we don't bother to restore %cs, %ds and %ss * changing them in 32-bit code is a recipe for disaster anyway */ fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(SegEs) - STACK_SPACE ); fprintf( outfile, "\tmovw %%ax,%%es\n" ); fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(SegFs) - STACK_SPACE ); fprintf( outfile, "\tmovw %%ax,%%fs\n" ); fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(SegGs) - STACK_SPACE ); fprintf( outfile, "\tmovw %%ax,%%gs\n" ); fprintf( outfile, "\tmovl %d(%%ebp),%%edi\n", CONTEXTOFFSET(Edi) - STACK_SPACE ); fprintf( outfile, "\tmovl %d(%%ebp),%%esi\n", CONTEXTOFFSET(Esi) - STACK_SPACE ); fprintf( outfile, "\tmovl %d(%%ebp),%%edx\n", CONTEXTOFFSET(Edx) - STACK_SPACE ); fprintf( outfile, "\tmovl %d(%%ebp),%%ecx\n", CONTEXTOFFSET(Ecx) - STACK_SPACE ); fprintf( outfile, "\tmovl %d(%%ebp),%%ebx\n", CONTEXTOFFSET(Ebx) - STACK_SPACE ); fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(EFlags) - STACK_SPACE ); fprintf( outfile, "\tpushl %%eax\n" ); fprintf( outfile, "\tpopfl\n" ); fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(Eax) - STACK_SPACE ); fprintf( outfile, "\tmovl %d(%%ebp),%%ebp\n", CONTEXTOFFSET(Esp) - STACK_SPACE ); fprintf( outfile, "\tleal -8(%%ebp),%%esp\n" ); fprintf( outfile, "\tpopl %%ebp\n" ); fprintf( outfile, "\tret\n" ); } /******************************************************************* * BuildRelays * * Build all the relay callbacks */ void BuildRelays( FILE *outfile ) { /* File header */ fprintf( outfile, "/* File generated automatically. Do not edit! */\n\n" ); fprintf( outfile, "\t.text\n" ); #ifdef __i386__ #ifdef USE_STABS if (output_file_name) { char buffer[1024]; getcwd(buffer, sizeof(buffer)); fprintf( outfile, "\t.file\t\"%s\"\n", output_file_name ); /* * The stabs help the internal debugger as they are an indication that it * is sensible to step into a thunk/trampoline. */ fprintf( outfile, ".stabs \"%s/\",100,0,0,Code_Start\n", buffer); fprintf( outfile, ".stabs \"%s\",100,0,0,Code_Start\n", output_file_name ); fprintf( outfile, "Code_Start:\n\n" ); } #endif fprintf( outfile, PREFIX"Call16_Start:\n" ); fprintf( outfile, "\t.globl "PREFIX"Call16_Start\n" ); fprintf( outfile, "\t.byte 0\n\n" ); /* Standard CallFrom16 routine (WORD return) */ BuildCallFrom16Core( outfile, FALSE, FALSE, TRUE ); /* Standard CallFrom16 routine (DWORD return) */ BuildCallFrom16Core( outfile, FALSE, FALSE, FALSE ); /* Register CallFrom16 routine */ BuildCallFrom16Core( outfile, TRUE, FALSE, FALSE ); /* C16ThkSL CallFrom16 routine */ BuildCallFrom16Core( outfile, FALSE, TRUE, FALSE ); /* Standard CallTo16 routine (WORD return) */ BuildCallTo16Core( outfile, TRUE, FALSE ); /* Standard CallTo16 routine (DWORD return) */ BuildCallTo16Core( outfile, FALSE, FALSE ); /* Register CallTo16 routine (16:16 retf) */ BuildCallTo16Core( outfile, FALSE, 1 ); /* Register CallTo16 routine (16:32 retf) */ BuildCallTo16Core( outfile, FALSE, 2 ); /* CBClientThunkSL routine */ BuildCallTo32CBClient( outfile, FALSE ); /* CBClientThunkSLEx routine */ BuildCallTo32CBClient( outfile, TRUE ); /* 32-bit register entry point */ BuildCallFrom32Regs( outfile ); fprintf( outfile, PREFIX"Call16_End:\n" ); fprintf( outfile, "\t.globl "PREFIX"Call16_End\n" ); #ifdef USE_STABS fprintf( outfile, "\t.stabs \"\",100,0,0,.Letext\n"); fprintf( outfile, ".Letext:\n"); #endif /* The whole Call16_Ret segment must lie within the .data section */ fprintf( outfile, "\n\t.data\n" ); fprintf( outfile, "\t.globl " PREFIX "Call16_Ret_Start\n" ); fprintf( outfile, PREFIX "Call16_Ret_Start:\n" ); /* Standard CallTo16 return stub */ BuildRet16Func( outfile ); /* CBClientThunkSL return stub */ BuildCallTo32CBClientRet( outfile, FALSE ); /* CBClientThunkSLEx return stub */ BuildCallTo32CBClientRet( outfile, TRUE ); /* End of Call16_Ret segment */ fprintf( outfile, "\n\t.globl " PREFIX "Call16_Ret_End\n" ); fprintf( outfile, PREFIX "Call16_Ret_End:\n" ); #else /* __i386__ */ fprintf( outfile, PREFIX"Call16_Start:\n" ); fprintf( outfile, "\t.globl "PREFIX"Call16_Start\n" ); fprintf( outfile, "\t.byte 0\n\n" ); fprintf( outfile, PREFIX"Call16_End:\n" ); fprintf( outfile, "\t.globl "PREFIX"Call16_End\n" ); fprintf( outfile, "\t.globl " PREFIX "Call16_Ret_Start\n" ); fprintf( outfile, PREFIX "Call16_Ret_Start:\n" ); fprintf( outfile, "\t.byte 0\n\n" ); fprintf( outfile, "\n\t.globl " PREFIX "Call16_Ret_End\n" ); fprintf( outfile, PREFIX "Call16_Ret_End:\n" ); #endif /* __i386__ */ }