123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606 |
- /*
- * 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
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
- */
- #include "config.h"
- #include <ctype.h>
- #include <stdarg.h>
- #include "build.h"
- /* offset of the stack pointer relative to %fs:(0) */
- #define STACKOFFSET 0x10c /* FIELD_OFFSET(TEB,SystemReserved1) */
- /* fix this if the x86_thread_data structure is changed */
- #define GS_OFFSET 0x1d8 /* FIELD_OFFSET(TEB,SystemReserved2) + FIELD_OFFSET(struct x86_thread_data,gs) */
- static void function_header( const char *name )
- {
- output( "\n\t.align %d\n", get_alignment(4) );
- output( "\t%s\n", func_declaration(name) );
- output( "%s\n", asm_globl(name) );
- }
- /*******************************************************************
- * 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( int reg_func, int thunk )
- {
- /* Function header */
- if (thunk) function_header( "__wine_call_from_16_thunk" );
- else if (reg_func) function_header( "__wine_call_from_16_regs" );
- else function_header( "__wine_call_from_16" );
- /* Create STACK16FRAME (except STACK32FRAME link) */
- output( "\tpushw %%gs\n" );
- output( "\tpushw %%fs\n" );
- output( "\tpushw %%es\n" );
- output( "\tpushw %%ds\n" );
- output( "\tpushl %%ebp\n" );
- output( "\tpushl %%ecx\n" );
- output( "\tpushl %%edx\n" );
- /* Save original EFlags register */
- if (reg_func) output( "\tpushfl\n" );
- if ( UsePIC )
- {
- output( "\tcall 1f\n" );
- output( "1:\tpopl %%ecx\n" );
- output( "\t.byte 0x2e\n\tmovl %s-1b(%%ecx),%%edx\n", asm_name("CallTo16_DataSelector") );
- }
- else
- output( "\t.byte 0x2e\n\tmovl %s,%%edx\n", asm_name("CallTo16_DataSelector") );
- /* Load 32-bit segment registers */
- output( "\tmovw %%dx, %%ds\n" );
- output( "\tmovw %%dx, %%es\n" );
- if ( UsePIC )
- output( "\tmovw %s-1b(%%ecx), %%fs\n", asm_name("CallTo16_TebSelector") );
- else
- output( "\tmovw %s, %%fs\n", asm_name("CallTo16_TebSelector") );
- output( "\t.byte 0x64\n\tmov (%d),%%gs\n", GS_OFFSET );
- /* Translate STACK16FRAME base to flat offset in %edx */
- output( "\tmovw %%ss, %%dx\n" );
- output( "\tandl $0xfff8, %%edx\n" );
- output( "\tshrl $1, %%edx\n" );
- if (UsePIC)
- output( "\taddl .Lwine_ldt_copy_ptr-1b(%%ecx),%%edx\n" );
- else
- output( "\taddl .Lwine_ldt_copy_ptr,%%edx\n" );
- output( "\tmovl (%%edx), %%edx\n" );
- output( "\tmovzwl %%sp, %%ebp\n" );
- output( "\tleal %d(%%ebp,%%edx), %%edx\n", reg_func ? 0 : -4 );
- /* Get saved flags into %ecx */
- if (reg_func) output( "\tpopl %%ecx\n" );
- /* Get the 32-bit stack pointer from the TEB and complete STACK16FRAME */
- output( "\t.byte 0x64\n\tmovl (%d), %%ebp\n", STACKOFFSET );
- output( "\tpushl %%ebp\n" );
- /* Switch stacks */
- output( "\t.byte 0x64\n\tmovw %%ss, (%d)\n", STACKOFFSET + 2 );
- output( "\t.byte 0x64\n\tmovw %%sp, (%d)\n", STACKOFFSET );
- output( "\tpushl %%ds\n" );
- output( "\tpopl %%ss\n" );
- output( "\tmovl %%ebp, %%esp\n" );
- output( "\taddl $0x20,%%ebp\n"); /* FIELD_OFFSET(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 */
- output( "\tleal 0x1a(%%edx),%%ebx\n" ); /* sizeof(STACK16FRAME)-22 */
- output( "\tleal -4(%%esp), %%ebp\n" );
- output( "\tcall *0x26(%%edx)\n"); /* FIELD_OFFSET(STACK16FRAME,entry_point) */
- /* Switch stack back */
- output( "\t.byte 0x64\n\tmovw (%d), %%ss\n", STACKOFFSET+2 );
- output( "\t.byte 0x64\n\tmovzwl (%d), %%esp\n", STACKOFFSET );
- output( "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
- /* Restore registers and return directly to caller */
- output( "\taddl $8, %%esp\n" );
- output( "\tpopl %%ebp\n" );
- output( "\tpopw %%ds\n" );
- output( "\tpopw %%es\n" );
- output( "\tpopw %%fs\n" );
- output( "\tpopw %%gs\n" );
- output( "\taddl $20, %%esp\n" );
- output( "\txorb %%ch, %%ch\n" );
- output( "\tpopl %%ebx\n" );
- output( "\taddw %%cx, %%sp\n" );
- output( "\tpush %%ebx\n" );
- output( "\t.byte 0x66\n" );
- output( "\tlret\n" );
- output_function_size( "__wine_call_from_16_thunk" );
- return;
- }
- /* Build register CONTEXT */
- if ( reg_func )
- {
- output( "\tsubl $0x2cc,%%esp\n" ); /* sizeof(CONTEXT86) */
- output( "\tmovl %%ecx,0xc0(%%esp)\n" ); /* EFlags */
- output( "\tmovl %%eax,0xb0(%%esp)\n" ); /* Eax */
- output( "\tmovl %%ebx,0xa4(%%esp)\n" ); /* Ebx */
- output( "\tmovl %%esi,0xa0(%%esp)\n" ); /* Esi */
- output( "\tmovl %%edi,0x9c(%%esp)\n" ); /* Edi */
- output( "\tmovl 0x0c(%%edx),%%eax\n"); /* FIELD_OFFSET(STACK16FRAME,ebp) */
- output( "\tmovl %%eax,0xb4(%%esp)\n" ); /* Ebp */
- output( "\tmovl 0x08(%%edx),%%eax\n"); /* FIELD_OFFSET(STACK16FRAME,ecx) */
- output( "\tmovl %%eax,0xac(%%esp)\n" ); /* Ecx */
- output( "\tmovl 0x04(%%edx),%%eax\n"); /* FIELD_OFFSET(STACK16FRAME,edx) */
- output( "\tmovl %%eax,0xa8(%%esp)\n" ); /* Edx */
- output( "\tmovzwl 0x10(%%edx),%%eax\n"); /* FIELD_OFFSET(STACK16FRAME,ds) */
- output( "\tmovl %%eax,0x98(%%esp)\n" ); /* SegDs */
- output( "\tmovzwl 0x12(%%edx),%%eax\n"); /* FIELD_OFFSET(STACK16FRAME,es) */
- output( "\tmovl %%eax,0x94(%%esp)\n" ); /* SegEs */
- output( "\tmovzwl 0x14(%%edx),%%eax\n"); /* FIELD_OFFSET(STACK16FRAME,fs) */
- output( "\tmovl %%eax,0x90(%%esp)\n" ); /* SegFs */
- output( "\tmovzwl 0x16(%%edx),%%eax\n"); /* FIELD_OFFSET(STACK16FRAME,gs) */
- output( "\tmovl %%eax,0x8c(%%esp)\n" ); /* SegGs */
- output( "\tmovzwl 0x2e(%%edx),%%eax\n"); /* FIELD_OFFSET(STACK16FRAME,cs) */
- output( "\tmovl %%eax,0xbc(%%esp)\n" ); /* SegCs */
- output( "\tmovzwl 0x2c(%%edx),%%eax\n"); /* FIELD_OFFSET(STACK16FRAME,ip) */
- output( "\tmovl %%eax,0xb8(%%esp)\n" ); /* Eip */
- output( "\t.byte 0x64\n\tmovzwl (%d), %%eax\n", STACKOFFSET+2 );
- output( "\tmovl %%eax,0xc8(%%esp)\n" ); /* SegSs */
- output( "\t.byte 0x64\n\tmovzwl (%d), %%eax\n", STACKOFFSET );
- output( "\taddl $0x2c,%%eax\n"); /* FIELD_OFFSET(STACK16FRAME,ip) */
- output( "\tmovl %%eax,0xc4(%%esp)\n" ); /* Esp */
- #if 0
- output( "\tfsave 0x1c(%%esp)\n" ); /* FloatSave */
- #endif
- /* Push address of CONTEXT86 structure -- popped by the relay routine */
- output( "\tmovl %%esp,%%eax\n" );
- output( "\tandl $~15,%%esp\n" );
- output( "\tsubl $4,%%esp\n" );
- output( "\tpushl %%eax\n" );
- }
- else
- {
- output( "\tsubl $8,%%esp\n" );
- output( "\tandl $~15,%%esp\n" );
- output( "\taddl $8,%%esp\n" );
- }
- /* Call relay routine (which will call the API entry point) */
- output( "\tleal 0x30(%%edx),%%eax\n" ); /* sizeof(STACK16FRAME) */
- output( "\tpushl %%eax\n" );
- output( "\tpushl 0x26(%%edx)\n"); /* FIELD_OFFSET(STACK16FRAME,entry_point) */
- output( "\tcall *0x20(%%edx)\n"); /* FIELD_OFFSET(STACK16FRAME,relay) */
- if ( reg_func )
- {
- output( "\tleal -748(%%ebp),%%ebx\n" ); /* sizeof(CONTEXT) + FIELD_OFFSET(STACK32FRAME,ebp) */
- /* Switch stack back */
- output( "\t.byte 0x64\n\tmovw (%d), %%ss\n", STACKOFFSET+2 );
- output( "\t.byte 0x64\n\tmovzwl (%d), %%esp\n", STACKOFFSET );
- output( "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
- /* Get return address to CallFrom16 stub */
- output( "\taddw $0x14,%%sp\n" ); /* FIELD_OFFSET(STACK16FRAME,callfrom_ip)-4 */
- output( "\tpopl %%eax\n" );
- output( "\tpopl %%edx\n" );
- /* Restore all registers from CONTEXT */
- output( "\tmovw 0xc8(%%ebx),%%ss\n"); /* SegSs */
- output( "\tmovl 0xc4(%%ebx),%%esp\n"); /* Esp */
- output( "\taddl $4, %%esp\n" ); /* room for final return address */
- output( "\tpushw 0xbc(%%ebx)\n"); /* SegCs */
- output( "\tpushw 0xb8(%%ebx)\n"); /* Eip */
- output( "\tpushl %%edx\n" );
- output( "\tpushl %%eax\n" );
- output( "\tpushl 0xc0(%%ebx)\n"); /* EFlags */
- output( "\tpushl 0x98(%%ebx)\n"); /* SegDs */
- output( "\tpushl 0x94(%%ebx)\n"); /* SegEs */
- output( "\tpopl %%es\n" );
- output( "\tpushl 0x90(%%ebx)\n"); /* SegFs */
- output( "\tpopl %%fs\n" );
- output( "\tpushl 0x8c(%%ebx)\n"); /* SegGs */
- output( "\tpopl %%gs\n" );
- output( "\tmovl 0xb4(%%ebx),%%ebp\n"); /* Ebp */
- output( "\tmovl 0xa0(%%ebx),%%esi\n"); /* Esi */
- output( "\tmovl 0x9c(%%ebx),%%edi\n"); /* Edi */
- output( "\tmovl 0xb0(%%ebx),%%eax\n"); /* Eax */
- output( "\tmovl 0xa8(%%ebx),%%edx\n"); /* Edx */
- output( "\tmovl 0xac(%%ebx),%%ecx\n"); /* Ecx */
- output( "\tmovl 0xa4(%%ebx),%%ebx\n"); /* Ebx */
- output( "\tpopl %%ds\n" );
- output( "\tpopfl\n" );
- output( "\tlret\n" );
- output_function_size( "__wine_call_from_16_regs" );
- }
- else
- {
- /* Switch stack back */
- output( "\t.byte 0x64\n\tmovw (%d), %%ss\n", STACKOFFSET+2 );
- output( "\t.byte 0x64\n\tmovzwl (%d), %%esp\n", STACKOFFSET );
- output( "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
- /* Restore registers */
- output( "\tpopl %%edx\n" );
- output( "\tpopl %%ecx\n" );
- output( "\tpopl %%ebp\n" );
- output( "\tpopw %%ds\n" );
- output( "\tpopw %%es\n" );
- output( "\tpopw %%fs\n" );
- output( "\tpopw %%gs\n" );
- /* Return to return stub which will return to caller */
- output( "\tlret $12\n" );
- output_function_size( "__wine_call_from_16" );
- }
- }
- /*******************************************************************
- * BuildCallTo16Core
- *
- * This routine builds the core routines used in 32->16 thunks:
- *
- * extern DWORD WINAPI wine_call_to_16( FARPROC16 target, DWORD cbArgs, PEXCEPTION_HANDLER handler );
- * extern void WINAPI wine_call_to_16_regs( CONTEXT86 *context, DWORD cbArgs, PEXCEPTION_HANDLER handler );
- *
- * These routines can be called directly from 32-bit code.
- *
- * All routines expect that the 16-bit stack contents (arguments) and the
- * return address (segptr to CallTo16_Ret) 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 accordingly.
- *
- * 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.
- */
- static void BuildCallTo16Core( int reg_func )
- {
- const char *name = reg_func ? "wine_call_to_16_regs" : "wine_call_to_16";
- const char *func_name = is_pe() ? strmake( "%s@12", name ) : name;
- /* Function header */
- function_header( func_name );
- /* Function entry sequence */
- output_cfi( ".cfi_startproc" );
- output( "\tpushl %%ebp\n" );
- output_cfi( ".cfi_adjust_cfa_offset 4" );
- output_cfi( ".cfi_rel_offset %%ebp,0" );
- output( "\tmovl %%esp, %%ebp\n" );
- output_cfi( ".cfi_def_cfa_register %%ebp" );
- /* Save the 32-bit registers */
- output( "\tpushl %%ebx\n" );
- output_cfi( ".cfi_rel_offset %%ebx,-4" );
- output( "\tpushl %%esi\n" );
- output_cfi( ".cfi_rel_offset %%esi,-8" );
- output( "\tpushl %%edi\n" );
- output_cfi( ".cfi_rel_offset %%edi,-12" );
- output( "\t.byte 0x64\n\tmov %%gs,(%d)\n", GS_OFFSET );
- /* Setup exception frame */
- output( "\t.byte 0x64\n\tpushl (%d)\n", STACKOFFSET );
- output( "\tpushl 16(%%ebp)\n" ); /* handler */
- output( "\t.byte 0x64\n\tpushl (0)\n" );
- output( "\t.byte 0x64\n\tmovl %%esp,(0)\n" );
- /* Call the actual CallTo16 routine (simulate a lcall) */
- output( "\tpushl %%cs\n" );
- output( "\tcall .L%s\n", name );
- /* Remove exception frame */
- output( "\t.byte 0x64\n\tpopl (0)\n" );
- output( "\taddl $4, %%esp\n" );
- output( "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
- if ( !reg_func )
- {
- /* Convert return value */
- output( "\tandl $0xffff,%%eax\n" );
- output( "\tshll $16,%%edx\n" );
- output( "\torl %%edx,%%eax\n" );
- }
- else
- {
- /*
- * Modify CONTEXT86 structure to contain new values
- *
- * NOTE: We restore only EAX, EBX, ECX, 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.]
- */
- output( "\tmovl 0x14(%%esp),%%edi\n" ); /* FIELD_OFFSET(STACK32FRAME,target) - FIELD_OFFSET(STACK32FRAME,edi) */
- /* everything above edi has been popped already */
- output( "\tmovl %%eax,0xb0(%%edi)\n"); /* Eax */
- output( "\tmovl %%ebx,0xa4(%%edi)\n"); /* Ebx */
- output( "\tmovl %%ecx,0xac(%%edi)\n"); /* Ecx */
- output( "\tmovl %%edx,0xa8(%%edi)\n"); /* Edx */
- output( "\tmovl %%ebp,0xb4(%%edi)\n"); /* Ebp */
- output( "\tmovl %%esi,0xc4(%%edi)\n"); /* Esp */
- /* The return glue code saved %esp into %esi */
- }
- /* Restore the 32-bit registers */
- output( "\tpopl %%edi\n" );
- output_cfi( ".cfi_same_value %%edi" );
- output( "\tpopl %%esi\n" );
- output_cfi( ".cfi_same_value %%esi" );
- output( "\tpopl %%ebx\n" );
- output_cfi( ".cfi_same_value %%ebx" );
- /* Function exit sequence */
- output( "\tpopl %%ebp\n" );
- output_cfi( ".cfi_def_cfa %%esp,4" );
- output_cfi( ".cfi_same_value %%ebp" );
- output( "\tret $12\n" );
- output_cfi( ".cfi_endproc" );
- /* Start of the actual CallTo16 routine */
- output( ".L%s:\n", name );
- /* Switch to the 16-bit stack */
- output( "\tmovl %%esp,%%edx\n" );
- output( "\t.byte 0x64\n\tmovw (%d),%%ss\n", STACKOFFSET + 2);
- output( "\t.byte 0x64\n\tmovw (%d),%%sp\n", STACKOFFSET );
- output( "\t.byte 0x64\n\tmovl %%edx,(%d)\n", STACKOFFSET );
- /* Make %bp point to the previous stackframe (built by CallFrom16) */
- output( "\tmovzwl %%sp,%%ebp\n" );
- output( "\tleal 0x2a(%%ebp),%%ebp\n"); /* FIELD_OFFSET(STACK16FRAME,bp) */
- /* Add the specified offset to the new sp */
- output( "\tsubw 0x2c(%%edx), %%sp\n"); /* FIELD_OFFSET(STACK32FRAME,nb_args) */
- if (reg_func)
- {
- /* Push the called routine address */
- output( "\tmovl 0x28(%%edx),%%edx\n"); /* FIELD_OFFSET(STACK32FRAME,target) */
- output( "\tpushw 0xbc(%%edx)\n"); /* SegCs */
- output( "\tpushw 0xb8(%%edx)\n"); /* Eip */
- /* Get the registers */
- output( "\tpushw 0x98(%%edx)\n"); /* SegDs */
- output( "\tpushl 0x94(%%edx)\n"); /* SegEs */
- output( "\tpopl %%es\n" );
- output( "\tmovl 0xb4(%%edx),%%ebp\n"); /* Ebp */
- output( "\tmovl 0xa0(%%edx),%%esi\n"); /* Esi */
- output( "\tmovl 0x9c(%%edx),%%edi\n"); /* Edi */
- output( "\tmovl 0xb0(%%edx),%%eax\n"); /* Eax */
- output( "\tmovl 0xa4(%%edx),%%ebx\n"); /* Ebx */
- output( "\tmovl 0xac(%%edx),%%ecx\n"); /* Ecx */
- output( "\tmovl 0xa8(%%edx),%%edx\n"); /* Edx */
- /* Get the 16-bit ds */
- output( "\tpopw %%ds\n" );
- }
- else /* not a register function */
- {
- /* Push the called routine address */
- output( "\tpushl 0x28(%%edx)\n"); /* FIELD_OFFSET(STACK32FRAME,target) */
- /* Set %fs and %gs to the value saved by the last CallFrom16 */
- output( "\tpushw -22(%%ebp)\n" ); /* FIELD_OFFSET(STACK16FRAME,fs)-FIELD_OFFSET(STACK16FRAME,bp) */
- output( "\tpopw %%fs\n" );
- output( "\tpushw -20(%%ebp)\n" ); /* FIELD_OFFSET(STACK16FRAME,gs)-FIELD_OFFSET(STACK16FRAME,bp) */
- output( "\tpopw %%gs\n" );
- /* Set %ds and %es (and %ax just in case) equal to %ss */
- output( "\tmovw %%ss,%%ax\n" );
- output( "\tmovw %%ax,%%ds\n" );
- output( "\tmovw %%ax,%%es\n" );
- }
- /* Jump to the called routine */
- output( "\t.byte 0x66\n" );
- output( "\tlret\n" );
- /* Function footer */
- output_function_size( func_name );
- }
- /*******************************************************************
- * BuildRet16Func
- *
- * Build the return code for 16-bit callbacks
- */
- static void BuildRet16Func(void)
- {
- function_header( "__wine_call_to_16_ret" );
- /* Save %esp into %esi */
- output( "\tmovl %%esp,%%esi\n" );
- /* Restore 32-bit segment registers */
- output( "\t.byte 0x2e\n\tmovl %s", asm_name("CallTo16_DataSelector") );
- output( "-%s,%%edi\n", asm_name("__wine_call16_start") );
- output( "\tmovw %%di,%%ds\n" );
- output( "\tmovw %%di,%%es\n" );
- output( "\t.byte 0x2e\n\tmov %s", asm_name("CallTo16_TebSelector") );
- output( "-%s,%%fs\n", asm_name("__wine_call16_start") );
- output( "\t.byte 0x64\n\tmov (%d),%%gs\n", GS_OFFSET );
- /* Restore the 32-bit stack */
- output( "\tmovw %%di,%%ss\n" );
- output( "\t.byte 0x64\n\tmovl (%d),%%esp\n", STACKOFFSET );
- /* Return to caller */
- output( "\tlret\n" );
- output_function_size( "__wine_call_to_16_ret" );
- }
- /*******************************************************************
- * output_asm_relays16
- *
- * Build all the 16-bit relay callbacks
- */
- void output_asm_relays16(void)
- {
- /* File header */
- output( "\t.text\n" );
- output( "%s:\n\n", asm_name("__wine_spec_thunk_text_16") );
- output( "%s\n", asm_globl("__wine_call16_start") );
- /* Standard CallFrom16 routine */
- BuildCallFrom16Core( 0, 0 );
- /* Register CallFrom16 routine */
- BuildCallFrom16Core( 1, 0 );
- /* C16ThkSL CallFrom16 routine */
- BuildCallFrom16Core( 0, 1 );
- /* Standard CallTo16 routine */
- BuildCallTo16Core( 0 );
- /* Register CallTo16 routine */
- BuildCallTo16Core( 1 );
- /* Standard CallTo16 return stub */
- BuildRet16Func();
- output( "%s\n", asm_globl("__wine_call16_end") );
- output_function_size( "__wine_spec_thunk_text_16" );
- /* Declare the return address and data selector variables */
- output( "\n\t.data\n\t.align %d\n", get_alignment(4) );
- output( "%s\n\t.long 0\n", asm_globl("CallTo16_DataSelector") );
- output( "%s\n\t.long 0\n", asm_globl("CallTo16_TebSelector") );
- }
|