/*
 * Copyright 1993 Robert J. Amstadt
 * Copyright 1995 Alexandre Julliard
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "wine.h"

/* ELF symbols do not have an underscore in front */
#ifdef __ELF__
#define PREFIX
#else
#define PREFIX "_"
#endif

#define TYPE_INVALID     0
#define TYPE_BYTE        1
#define TYPE_WORD        2
#define TYPE_LONG        3
#define TYPE_PASCAL_16   4
#define TYPE_PASCAL      5
#define TYPE_REGISTER    6
#define TYPE_ABS         7
#define TYPE_RETURN      8

#define MAX_ORDINALS	1299

typedef struct ordinal_definition_s
{
    int type;
    int offset;
    char export_name[80];
    void *additional_data;
} ORDDEF;

typedef struct ordinal_variable_definition_s
{
    int n_values;
    int *values;
} ORDVARDEF;

typedef struct ordinal_function_definition_s
{
    int  n_args;
    char arg_types[32];
    char internal_name[80];
} ORDFUNCDEF;

typedef struct ordinal_return_definition_s
{
    int arg_size;
    int ret_value;
} ORDRETDEF;

static ORDDEF OrdinalDefinitions[MAX_ORDINALS];

char LowerDLLName[80];
char UpperDLLName[80];
int Limit;
int DLLId;
FILE *SpecFp;

char *ParseBuffer = NULL;
char *ParseNext;
char ParseSaveChar;
int Line;

static int debugging = 1;

  /* Offset of register relative to the end of the context struct */
#define CONTEXTOFFSET(reg) \
   ((int)&(((struct sigcontext_struct *)1)->reg) - 1 \
    - sizeof(struct sigcontext_struct))

static int IsNumberString(char *s)
{
    while (*s != '\0')
	if (!isdigit(*s++))
	    return 0;

    return 1;
}

static char *strlower(char *s)
{
    char *p;
    
    for(p = s; *p != '\0'; p++)
	*p = tolower(*p);

    return s;
}

static char *strupper(char *s)
{
    char *p;
    
    for(p = s; *p != '\0'; p++)
	*p = toupper(*p);

    return s;
}

static char * GetTokenInLine(void)
{
    char *p;
    char *token;

    if (ParseNext != ParseBuffer)
    {
	if (ParseSaveChar == '\0')
	    return NULL;
	*ParseNext = ParseSaveChar;
    }
    
    /*
     * Remove initial white space.
     */
    for (p = ParseNext; isspace(*p); p++)
	;
    
    if (*p == '\0')
	return NULL;
    
    /*
     * Find end of token.
     */
    token = p++;
    if (*token != '(' && *token != ')')
	while (*p != '\0' && *p != '(' && *p != ')' && !isspace(*p))
	    p++;
    
    ParseSaveChar = *p;
    ParseNext = p;
    *p = '\0';

    return token;
}

static char * GetToken(void)
{
    char *token;

    if (ParseBuffer == NULL)
    {
	ParseBuffer = malloc(512);
	ParseNext = ParseBuffer;
	Line++;
	while (1)
	{
	    if (fgets(ParseBuffer, 511, SpecFp) == NULL)
		return NULL;
	    if (ParseBuffer[0] != '#')
		break;
	}
    }

    while ((token = GetTokenInLine()) == NULL)
    {
	ParseNext = ParseBuffer;
	Line++;
	while (1)
	{
	    if (fgets(ParseBuffer, 511, SpecFp) == NULL)
		return NULL;
	    if (ParseBuffer[0] != '#')
		break;
	}
    }

    return token;
}

static int ParseVariable(int ordinal, int type)
{
    ORDDEF *odp;
    ORDVARDEF *vdp;
    char export_name[80];
    char *token;
    char *endptr;
    int *value_array;
    int n_values;
    int value_array_size;
    
    strcpy(export_name, GetToken());

    token = GetToken();
    if (*token != '(')
    {
	fprintf(stderr, "%d: Expected '(' got '%s'\n", Line, token);
	exit(1);
    }

    n_values = 0;
    value_array_size = 25;
    value_array = malloc(sizeof(*value_array) * value_array_size);
    
    while ((token = GetToken()) != NULL)
    {
	if (*token == ')')
	    break;

	value_array[n_values++] = strtol(token, &endptr, 0);
	if (n_values == value_array_size)
	{
	    value_array_size += 25;
	    value_array = realloc(value_array, 
				  sizeof(*value_array) * value_array_size);
	}
	
	if (endptr == NULL || *endptr != '\0')
	{
	    fprintf(stderr, "%d: Expected number value, got '%s'\n", Line,
		    token);
	    exit(1);
	}
    }
    
    if (token == NULL)
    {
	fprintf(stderr, "%d: End of file in variable declaration\n", Line);
	exit(1);
    }

    if (ordinal >= MAX_ORDINALS)
    {
	fprintf(stderr, "%d: Ordinal number too large\n", Line);
	exit(1);
    }
    
    odp = &OrdinalDefinitions[ordinal];
    odp->type = type;
    strcpy(odp->export_name, export_name);
    
    vdp = malloc(sizeof(*vdp));
    odp->additional_data = vdp;
    
    vdp->n_values = n_values;
    vdp->values = realloc(value_array, sizeof(*value_array) * n_values);

    return 0;
}

static int ParseExportFunction(int ordinal, int type)
{
    char *token;
    ORDDEF *odp;
    ORDFUNCDEF *fdp;
    int i;
    
    if (ordinal >= MAX_ORDINALS)
    {
	fprintf(stderr, "%d: Ordinal number too large\n", Line);
	exit(1);
    }
    
    odp = &OrdinalDefinitions[ordinal];
    strcpy(odp->export_name, GetToken());
    odp->type = type;
    fdp = malloc(sizeof(*fdp));
    odp->additional_data = fdp;

    token = GetToken();
    if (*token != '(')
    {
	fprintf(stderr, "%d: Expected '(' got '%s'\n", Line, token);
	exit(1);
    }

    for (i = 0; i < 16; i++)
    {
	token = GetToken();
	if (*token == ')')
	    break;

	if (!strcmp(token, "byte") || !strcmp(token, "word"))
            fdp->arg_types[i] = 'w';
	else if (!strcmp(token, "s_byte") || !strcmp(token, "s_word"))
            fdp->arg_types[i] = 's';
	else if (!strcmp(token, "long") || !strcmp(token, "segptr"))
            fdp->arg_types[i] = 'l';
	else if (!strcmp(token, "ptr"))
            fdp->arg_types[i] = 'p';
	else
	{
	    fprintf(stderr, "%d: Unknown variable type '%s'\n", Line, token);
	    exit(1);
	}
    }
    fdp->arg_types[i] = '\0';

    if ((type == TYPE_REGISTER) && (i > 0))
    {
        fprintf( stderr, "%d: Register function can't have arguments\n", Line);
        exit(1);
    }

    strcpy(fdp->internal_name, GetToken());
    return 0;
}

static int ParseEquate(int ordinal)
{
    ORDDEF *odp;
    char *token;
    char *endptr;
    int value;
    
    if (ordinal >= MAX_ORDINALS)
    {
	fprintf(stderr, "%d: Ordinal number too large\n", Line);
	exit(1);
    }
    
    odp = &OrdinalDefinitions[ordinal];
    strcpy(odp->export_name, GetToken());

    token = GetToken();
    value = strtol(token, &endptr, 0);
    if (endptr == NULL || *endptr != '\0')
    {
	fprintf(stderr, "%d: Expected number value, got '%s'\n", Line,
		token);
	exit(1);
    }

    odp->type = TYPE_ABS;
    odp->additional_data = (void *) value;

    return 0;
}

static int ParseReturn(int ordinal)
{
    ORDDEF *odp;
    ORDRETDEF *rdp;
    char *token;
    char *endptr;
    
    if (ordinal >= MAX_ORDINALS)
    {
	fprintf(stderr, "%d: Ordinal number too large\n", Line);
	exit(1);
    }

    rdp = malloc(sizeof(*rdp));
    
    odp = &OrdinalDefinitions[ordinal];
    strcpy(odp->export_name, GetToken());
    odp->type = TYPE_RETURN;
    odp->additional_data = rdp;

    token = GetToken();
    rdp->arg_size = strtol(token, &endptr, 0);
    if (endptr == NULL || *endptr != '\0')
    {
	fprintf(stderr, "%d: Expected number value, got '%s'\n", Line,
		token);
	exit(1);
    }

    token = GetToken();
    rdp->ret_value = strtol(token, &endptr, 0);
    if (endptr == NULL || *endptr != '\0')
    {
	fprintf(stderr, "%d: Expected number value, got '%s'\n", Line,
		token);
	exit(1);
    }

    return 0;
}

static int ParseOrdinal(int ordinal)
{
    char *token;
    
    token = GetToken();
    if (token == NULL)
    {
	fprintf(stderr, "%d: Expected type after ordinal\n", Line);
	exit(1);
    }

    if (strcmp(token, "byte") == 0)
	return ParseVariable(ordinal, TYPE_BYTE);
    else if (strcmp(token, "word") == 0)
	return ParseVariable(ordinal, TYPE_WORD);
    else if (strcmp(token, "long") == 0)
	return ParseVariable(ordinal, TYPE_LONG);
    else if (strcmp(token, "p") == 0)
	return ParseExportFunction(ordinal, TYPE_PASCAL);
    else if (strcmp(token, "pascal") == 0)
	return ParseExportFunction(ordinal, TYPE_PASCAL);
    else if (strcmp(token, "pascal16") == 0)
	return ParseExportFunction(ordinal, TYPE_PASCAL_16);
    else if (strcmp(token, "register") == 0)
	return ParseExportFunction(ordinal, TYPE_REGISTER);
    else if (strcmp(token, "equate") == 0)
	return ParseEquate(ordinal);
    else if (strcmp(token, "return") == 0)
	return ParseReturn(ordinal);
    else
    {
	fprintf(stderr, 
		"%d: Expected type after ordinal, found '%s' instead\n",
		Line, token);
	exit(1);
    }
}

static int ParseTopLevel(void)
{
    char *token;
    
    while ((token = GetToken()) != NULL)
    {
	if (strcmp(token, "name") == 0)
	{
	    strcpy(LowerDLLName, GetToken());
	    strlower(LowerDLLName);

	    strcpy(UpperDLLName, LowerDLLName);
	    strupper(UpperDLLName);
	}
	else if (strcmp(token, "id") == 0)
	{
	    token = GetToken();
	    if (!IsNumberString(token))
	    {
		fprintf(stderr, "%d: Expected number after id\n", Line);
		exit(1);
	    }
	    
	    DLLId = atoi(token);
	}
	else if (strcmp(token, "length") == 0)
	{
	    token = GetToken();
	    if (!IsNumberString(token))
	    {
		fprintf(stderr, "%d: Expected number after length\n", Line);
		exit(1);
	    }

	    Limit = atoi(token);
	}
	else if (IsNumberString(token))
	{
	    int ordinal;
	    int rv;
	    
	    ordinal = atoi(token);
	    if ((rv = ParseOrdinal(ordinal)) < 0)
		return rv;
	}
	else
	{
	    fprintf(stderr, 
		    "%d: Expected name, id, length or ordinal\n", Line);
	    exit(1);
	}
    }

    return 0;
}


static int OutputVariableCode(FILE *fp, char *storage, ORDDEF *odp)
{
    ORDVARDEF *vdp;
    int i;

    vdp = odp->additional_data;
    fprintf( fp, "\t.data\n" );
    for (i = 0; i < vdp->n_values; i++)
    {
	if ((i & 7) == 0)
	    fprintf(fp, "\t%s\t", storage);
	    
	fprintf(fp, "%d", vdp->values[i]);
	
	if ((i & 7) == 7 || i == vdp->n_values - 1)
	    fprintf(fp, "\n");
	else
	    fprintf(fp, ", ");
    }
    fprintf(fp, "\n");
    fprintf( fp, "\t.text\n" );
    return vdp->n_values;
}

static void BuildSpecFiles( char *specname)
{
    ORDDEF *odp;
    ORDFUNCDEF *fdp;
    ORDRETDEF *rdp;
    FILE *fp;
    char filename[80];
    int i;
    int code_offset, data_offset;

    SpecFp = fopen( specname, "r");
    if (SpecFp == NULL)
    {
	fprintf(stderr, "Could not open specification file, '%s'\n", specname);
	exit(1);
    }

    ParseTopLevel();

    sprintf(filename, "dll_%s.S", LowerDLLName);
    fp = fopen(filename, "w");
    fprintf( fp, "/* File generated automatically; do not edit! */\n" );
    fprintf( fp, "\t.data\n" );
    fprintf( fp, "\t.globl " PREFIX "%s_Data_Start\n", UpperDLLName );
    fprintf( fp, PREFIX "%s_Data_Start:\n", UpperDLLName );
    fprintf( fp, "\t.text\n" );
    fprintf( fp, "\t.globl " PREFIX "%s_Code_Start\n", UpperDLLName );
    fprintf( fp, PREFIX "%s_Code_Start:\n", UpperDLLName );
    code_offset = data_offset = 0;

    odp = OrdinalDefinitions;
    for (i = 0; i <= Limit; i++, odp++)
    {
        fdp = odp->additional_data;
        rdp = odp->additional_data;
	    
        switch (odp->type)
        {
          case TYPE_INVALID:
            fprintf( fp, "/* %s.%d */\n", UpperDLLName, i);
            fprintf( fp, "\tpushw %%bp\n" );
            fprintf( fp, "\tpushl $0x%08x\n", (DLLId << 16) | i);
            fprintf( fp, "\tpushl $" PREFIX "RELAY_Unimplemented\n" );
            fprintf( fp, "\tljmp $0x%04x, $" PREFIX "CallTo32_word_\n",
                         WINE_CODE_SELECTOR );
            odp->offset = code_offset;
            code_offset += 19;  /* Assembly code is 19 bytes long */
            break;

          case TYPE_ABS:
            odp->offset = (int)odp->additional_data & 0xffff;
            break;

          case TYPE_BYTE:
            fprintf( fp, "/* %s.%d */\n", UpperDLLName, i);
            odp->offset = data_offset;
            data_offset += OutputVariableCode(fp, ".byte", odp);
            break;

          case TYPE_WORD:
            fprintf( fp, "/* %s.%d */\n", UpperDLLName, i);
            odp->offset = data_offset;
            data_offset += 2 * OutputVariableCode(fp, ".word", odp);
            break;

          case TYPE_LONG:
            fprintf( fp, "/* %s.%d */\n", UpperDLLName, i);
            odp->offset = data_offset;
            data_offset += 4 * OutputVariableCode(fp, ".long", odp);
            break;

          case TYPE_RETURN:
            fprintf( fp, "/* %s.%d */\n", UpperDLLName, i);
            fprintf( fp, "\tmovw $%d,%%ax\n", rdp->ret_value & 0xffff );
            fprintf( fp, "\tmovw $%d,%%dx\n", (rdp->ret_value >> 16) & 0xffff);
            fprintf(fp, "\t.byte 0x66\n");
            if (rdp->arg_size != 0)
                fprintf(fp, "\tlret $%d\n", rdp->arg_size);
            else
                fprintf(fp, "\tlret\n");
            odp->offset = code_offset;
            code_offset += 10;  /* Assembly code is 10 bytes long */
            if (rdp->arg_size != 0) code_offset += 2;
            break;

          case TYPE_REGISTER:
          case TYPE_PASCAL:
          case TYPE_PASCAL_16:
            fprintf( fp, "/* %s.%d */\n", UpperDLLName, i);
            fprintf(fp, "\tpushw %%bp\n" );
            fprintf(fp, "\tpushl $0x%08x\n", (DLLId << 16) | i);
            fprintf(fp, "\tpushl $" PREFIX "%s\n", fdp->internal_name );
            fprintf(fp, "\tljmp $0x%04x, $" PREFIX "CallTo32_%s_%s\n\n",
                        WINE_CODE_SELECTOR,
                        (odp->type == TYPE_REGISTER) ? "regs" :
                        (odp->type == TYPE_PASCAL) ? "long" : "word",
                        fdp->arg_types );
            odp->offset = code_offset;
            code_offset += 19;  /* Assembly code is 19 bytes long */
            break;
		
          default:
            fprintf( stderr, "build: Unknown function type; please report.\n");
            break;
	}
    }

    fprintf( fp, "\t.data\n" );
    fprintf( fp, "\t.globl " PREFIX "%s_Data_End\n", UpperDLLName );
    fprintf( fp, PREFIX "%s_Data_End:\n", UpperDLLName );
    fprintf( fp, "\t.text\n" );
    fprintf( fp, "\t.globl " PREFIX "%s_Code_End\n", UpperDLLName );
    fprintf( fp, PREFIX "%s_Code_End:\n", UpperDLLName );

    fclose(fp);

    sprintf(filename, "tab_%s.c", LowerDLLName);
    fp = fopen(filename, "w");

    fprintf( fp, "/* File generated automatically; do not edit! */\n\n" );
    fprintf( fp, "#include \"dlls.h\"\n\n" );
    fprintf( fp, "static struct dll_table_entry_s %s_table_entries[%d] =\n{\n",
                 UpperDLLName, Limit + 1);
    odp = OrdinalDefinitions;
    for (i = 0; i <= Limit; i++, odp++)
    {
        int selector;

	fdp = odp->additional_data;

	switch (odp->type)
	{
        case TYPE_INVALID:
        case TYPE_PASCAL:
        case TYPE_PASCAL_16:
        case TYPE_REGISTER:
            selector = 1;  /* Code selector */
            break;

        case TYPE_BYTE:
        case TYPE_WORD:
        case TYPE_LONG:
            selector = 2;  /* Data selector */
            break;

        case TYPE_ABS:
            selector = 0xff;  /* Constant selector */
            break;
        }

        fprintf(fp, "    { %d, %d, ", selector, odp->offset );
        fprintf(fp, "\"%s\" ", odp->export_name);
#ifdef WINESTAT
        fprintf(fp, ",0 ");
#endif	    
        fprintf(fp, "}, \n");
    }

    fprintf(fp, "};\n\n");

    fprintf( fp, "extern void %s_Code_Start();\n", UpperDLLName );
    fprintf( fp, "extern void %s_Code_End();\n", UpperDLLName );
    fprintf( fp, "extern void %s_Data_Start();\n", UpperDLLName );
    fprintf( fp, "extern void %s_Data_End();\n\n", UpperDLLName );
    fprintf( fp, "struct dll_table_s %s_table =\n{\n", UpperDLLName );
    fprintf( fp, "  %s_table_entries, %d, %d,\n",
             UpperDLLName, Limit + 1, DLLId );
    fprintf( fp, "  (void *)%s_Code_Start, (void *)%s_Code_End,\n",
             UpperDLLName, UpperDLLName );
    fprintf( fp, "  (void *)%s_Data_Start, (void *)%s_Data_End\n};\n",
             UpperDLLName, UpperDLLName );
    fclose(fp);
}


/*******************************************************************
 *         TransferArgs16To32
 *
 * Get the arguments from the 16-bit stack and push them on the 32-bit stack.
 * The 16-bit stack layout is:
 *   ...     ...
 *  (bp+8)    arg2
 *  (bp+6)    arg1
 *  (bp+4)    cs
 *  (bp+2)    ip
 *  (bp)      bp
 */
static int TransferArgs16To32( char *args )
{
    int i, pos16, pos32;

    /* Save ebx first */

    printf( "\tpushl %%ebx\n" );

    /* Get the 32-bit stack pointer */

    printf( "\tmovl " PREFIX "IF1632_Saved32_esp,%%ebx\n" );

    /* Copy the arguments */

    pos16 = 6;  /* skip bp and return address */
    pos32 = 0;

    for (i = strlen(args); i > 0; i--)
    {
        pos32 -= 4;
        switch(args[i-1])
        {
        case 'w':  /* word */
            printf( "\tmovzwl %d(%%ebp),%%eax\n", pos16 );
            printf( "\tmovl %%eax,%d(%%ebx)\n", pos32 );
            pos16 += 2;
            break;

        case 's':  /* s_word */
            printf( "\tmovswl %d(%%ebp),%%eax\n", pos16 );
            printf( "\tmovl %%eax,%d(%%ebx)\n", pos32 );
            pos16 += 2;
            break;

        case 'l':  /* long */
            printf( "\tmovl %d(%%ebp),%%eax\n", pos16 );
            printf( "\tmovl %%eax,%d(%%ebx)\n", pos32 );
            pos16 += 4;
            break;

        case 'p':  /* ptr */
            /* Get the selector */
            printf( "\tmovw %d(%%ebp),%%ax\n", pos16 + 2 );
            /* Get the selector base */
            printf( "\tandl $0xfff8,%%eax\n" );
            printf( "\tmovl " PREFIX "ldt_copy(%%eax),%%eax\n" );
            printf( "\tmovl %%eax,%d(%%ebx)\n", pos32 );
            /* Add the offset */
            printf( "\tmovzwl %d(%%ebp),%%eax\n", pos16 );
            printf( "\taddl %%eax,%d(%%ebx)\n", pos32 );
            pos16 += 4;
            break;

        default:
            fprintf( stderr, "Unknown arg type '%c'\n", args[i-1] );
        }
    }

    /* Restore ebx */
    
    printf( "\tpopl %%ebx\n" );

    return pos16 - 6;  /* Return the size of the 16-bit args */
}


/*******************************************************************
 *         BuildContext
 *
 * Build the context structure on the 32-bit stack.
 * The only valid registers in the context structure are:
 *   eax, ebx, ecx, edx, esi, edi, ds, es, (some of the) flags
 */
static void BuildContext(void)
{
    /* Save ebx first */

    printf( "\tpushl %%ebx\n" );

    /* Get the 32-bit stack pointer */

    printf( "\tmovl " PREFIX "IF1632_Saved32_esp,%%ebx\n" );

    /* Store the registers */

    printf( "\tpopl %d(%%ebx)\n", CONTEXTOFFSET(sc_ebx) ); /* Get ebx from stack */
    printf( "\tmovl %%eax,%d(%%ebx)\n", CONTEXTOFFSET(sc_eax) );
    printf( "\tmovl %%ecx,%d(%%ebx)\n", CONTEXTOFFSET(sc_ecx) );
    printf( "\tmovl %%edx,%d(%%ebx)\n", CONTEXTOFFSET(sc_edx) );
    printf( "\tmovl %%esi,%d(%%ebx)\n", CONTEXTOFFSET(sc_esi) );
    printf( "\tmovl %%edi,%d(%%ebx)\n", CONTEXTOFFSET(sc_edi) );
    printf( "\tmovw %%es,%d(%%ebx)\n", CONTEXTOFFSET(sc_es) );
    printf( "\tmovw -10(%%ebp),%%ax\n" );  /* Get saved ds from stack */
    printf( "\tmovw %%ax,%d(%%ebx)\n", CONTEXTOFFSET(sc_ds) );
    printf( "\tpushfl\n" );
#ifndef __FreeBSD__
    printf( "\tpopl %d(%%ebx)\n", CONTEXTOFFSET(sc_eflags) );
#else    
    printf( "\tpopl %d(%%ebx)\n", CONTEXTOFFSET(sc_efl) );
#endif
}


/*******************************************************************
 *         RestoreContext
 *
 * Restore the registers from the context structure
 */
static void RestoreContext(void)
{
    /* Get the 32-bit stack pointer */

    printf( "\tmovl " PREFIX "IF1632_Saved32_esp,%%ebx\n" );

    /* Restore the registers */

    printf( "\tmovl %d(%%ebx),%%ecx\n", CONTEXTOFFSET(sc_ecx) );
    printf( "\tmovl %d(%%ebx),%%edx\n", CONTEXTOFFSET(sc_edx) );
    printf( "\tmovl %d(%%ebx),%%esi\n", CONTEXTOFFSET(sc_esi) );
    printf( "\tmovl %d(%%ebx),%%edi\n", CONTEXTOFFSET(sc_edi) );
    printf( "\tmovw %d(%%ebx),%%es\n", CONTEXTOFFSET(sc_es) );
    printf( "\tpopw %%ax\n" );  /* Remove old ds from the stack */
    printf( "\tpushw %d(%%ebx)\n", CONTEXTOFFSET(sc_ds) ); /* Push new ds */
#ifndef __FreeBSD__
    printf( "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(sc_eflags) );
#else    
    printf( "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(sc_efl) );
#endif
    printf( "\tpopfl\n" );
    printf( "\tmovl %d(%%ebx),%%eax\n", CONTEXTOFFSET(sc_eax) );
    printf( "\tmovl %d(%%ebx),%%ebx\n", CONTEXTOFFSET(sc_ebx) );
}


/*******************************************************************
 *         BuildCall32Func
 *
 * Build a 32-bit callback function. The syntax of the function
 * profile is: type_xxxxx, where 'type' is one of 'regs', 'word' or
 * 'long' and each 'x' is an argument ('w'=word, 's'=signed word,
 * 'l'=long, 'p'=pointer).
 *
 * Stack layout upon entry to the callback function:
 *  ...      ...
 * (sp+14)  first 16-bit arg
 * (sp+12)  cs (word)
 * (sp+10)  ip (word)
 * (sp+8)   bp (word)
 * (sp+4)   dll_id+ordinal (long)
 * (sp)     entrypoint (long)
 *
 */
static void BuildCall32Func( char *profile )
{
    int argsize = 0;
    int short_ret = 0;
    int reg_func = 0;
    char *args = profile + 5;

    /* Parse function type */

    if (!strncmp( "word_", profile, 5 )) short_ret = 1;
    else if (!strncmp( "regs_", profile, 5 )) reg_func = 1;
    else if (strncmp( "long_", profile, 5 ))
    {
        fprintf( stderr, "Invalid function name '%s', ignored\n", profile );
        return;
    }

    /* Function header */

    printf( "/**********\n" );
    printf( " * " PREFIX "CallTo32_%s\n", profile );
    printf( " **********/\n" );
    printf( "\t.align 4\n" );
    printf( "\t.global " PREFIX "CallTo32_%s\n\n", profile );
    printf( PREFIX "CallTo32_%s:\n", profile );

    /* Setup bp to point to its copy on the stack */

    printf( "\tmovzwl %%sp,%%ebp\n" );
    printf( "\taddw $8,%%bp\n" );

    /* Save 16-bit ds */

    printf( "\tpushw %%ds\n" );

    /* Restore 32-bit ds */

    printf( "\tpushw $0x%04x\n", WINE_DATA_SELECTOR );
    printf( "\tpopw %%ds\n" );

    /* Save the 16-bit stack */

    printf( "\tpushw " PREFIX "IF1632_Saved16_bp\n" );
    printf( "\tpushw " PREFIX "IF1632_Saved16_sp\n" );
    printf( "\tpushw " PREFIX "IF1632_Saved16_ss\n" );
    printf( "\tmovw %%ss," PREFIX "IF1632_Saved16_ss\n" );
    printf( "\tmovw %%sp," PREFIX "IF1632_Saved16_sp\n" );
    printf( "\tmovw %%bp," PREFIX "IF1632_Saved16_bp\n" );

    /* Transfer the arguments */

    if (reg_func) BuildContext();
    else if (*args) argsize = TransferArgs16To32( args );

    /* Get the address of the API function */

    printf( "\tmovl -8(%%ebp),%%eax\n" );

    /* Setup es */

    printf( "\tpushw %%ds\n" );
    printf( "\tpopw %%es\n" );

    /* Switch to the 32-bit stack */

    printf( "\tpushw %%ds\n" );
    printf( "\tpopw %%ss\n" );
    printf( "\tmovl " PREFIX "IF1632_Saved32_esp,%%esp\n" );
    printf( "\tmovl " PREFIX "IF1632_Saved32_ebp,%%ebp\n" );
    if (reg_func)
        printf( "\tsubl $%d,%%esp\n", sizeof(struct sigcontext_struct) );
    else if (*args)
        printf( "\tsubl $%d,%%esp\n", 4 * strlen(args) );

    /* Call the entry point */

    if (debugging)
    {
        printf( "\tpushl %%eax\n" );
        printf( "\tpushl $CALL32_Str_%s\n", profile );
        printf( "\tcall " PREFIX "RELAY_DebugCall32\n" );
        printf( "\tpopl %%eax\n" );
        printf( "\tpopl %%eax\n" );
    }

    printf( "\tcall %%eax\n" );

    if (debugging)
    {
        printf( "\tpushl %%eax\n" );
        printf( "\tpushl $%d\n", short_ret );
        printf( "\tcall " PREFIX "RELAY_DebugReturn\n" );
        printf( "\tpopl %%eax\n" );
        printf( "\tpopl %%eax\n" );
    }

    if (reg_func)
        printf( "\taddl $%d,%%esp\n", sizeof(struct sigcontext_struct) );
    else if (*args)
        printf( "\taddl $%d,%%esp\n", 4 * strlen(args) );

    /* Restore the 16-bit stack */

    printf( "\tmovw " PREFIX "IF1632_Saved16_ss,%%ss\n" );
    printf( "\tmovw " PREFIX "IF1632_Saved16_sp,%%sp\n" );
    printf( "\tmovw " PREFIX "IF1632_Saved16_bp,%%bp\n" );
    printf( "\tpopw " PREFIX "IF1632_Saved16_ss\n" );
    printf( "\tpopw " PREFIX "IF1632_Saved16_sp\n" );
    printf( "\tpopw " PREFIX "IF1632_Saved16_bp\n" );

    /* Restore registers from the context structure */

    if (reg_func)
    {
        printf( "\tandl $0xffff,%%ebp\n" );
        RestoreContext();
    }
    else  /* Store the return value in dx:ax if needed */
    {
        if (!short_ret)
        {
            printf( "\tpushl %%eax\n" );
            printf( "\tpopw %%dx\n" );
            printf( "\tpopw %%dx\n" );
        }
    }

    /* Restore ds and bp */

    printf( "\tpopw %%ds\n" );
    printf( "\tmovw %%bp,%%sp\n" );
    printf( "\tpopw %%bp\n" );

    /* Remove the arguments and return */

    if (argsize)
    {
        printf( "\t.byte 0x66\n" );
        printf( "\tlret $%d\n", argsize );
    }
    else
    {
        printf( "\t.byte 0x66\n" );
        printf( "\tlret\n" );
    }
}


/*******************************************************************
 *         BuildCall16Func
 *
 * Build a 16-bit callback function.
 *
 * Stack frame of the callback function:
 *  ...      ...
 * (ebp+22) arg2
 * (ebp+18) arg1
 * (ebp+14) 16-bit ds
 * (ebp+10) func to call
 * (ebp+8)  code selector
 * (ebp+4)  return address
 * (ebp)    previous ebp
 *
 * Prototypes for the CallTo16 functions:
 *   extern WORD CallTo16_word_xxx( FARPROC func, WORD ds, args... );
 *   extern LONG CallTo16_long_xxx( FARPROC func, WORD ds, args... );
 *   extern void CallTo16_regs_( FARPROC func, WORD ds, WORD es, WORD ax,
 *                               WORD bx, WORD cx, WORD dx, WORD si, WORD di );
 */
static void BuildCall16Func( char *profile )
{
    int short_ret = 0;
    int reg_func = 0;
    char *args = profile + 5;

    if (!strncmp( "word_", profile, 5 )) short_ret = 1;
    else if (!strncmp( "regs_", profile, 5 )) reg_func = short_ret = 1;
    else if (strncmp( "long_", profile, 5 ))
    {
        fprintf( stderr, "Invalid function name '%s', ignored\n", profile );
        return;
    }

    /* Function header */

    printf( "/**********\n" );
    printf( " * " PREFIX "CallTo16_%s\n", profile );
    printf( " **********/\n" );
    printf( "\t.align 4\n" );
    printf( "\t.global " PREFIX "CallTo16_%s\n\n", profile );
    printf( PREFIX "CallTo16_%s:\n", profile );

    /* Push code selector before return address to simulate a lcall */

    printf( "\tpopl %%eax\n" );
    printf( "\tpushw $0x%04x\n", WINE_CODE_SELECTOR );
    printf( "\tpushl %%eax\n" );

    /* Entry code */

    printf( "\tpushl %%ebp\n" );
    printf( "\tmovl %%esp,%%ebp\n" );

    /* Save the 32-bit registers */

    printf( "\tpushl %%ebx\n" );
    printf( "\tpushl %%ecx\n" );
    printf( "\tpushl %%edx\n" );
    printf( "\tpushl %%esi\n" );
    printf( "\tpushl %%edi\n" );

    /* Save the 32-bit stack */

    printf( "\tpushl " PREFIX "IF1632_Saved32_esp\n" );
    printf( "\tpushl " PREFIX "IF1632_Saved32_ebp\n" );
    printf( "\tmovl %%esp," PREFIX "IF1632_Saved32_esp\n" );
    printf( "\tmovl %%ebp," PREFIX "IF1632_Saved32_ebp\n" );
    printf( "\tmovl %%ebp,%%ebx\n" );

    /* Print debugging info */

    if (debugging)
    {
        /* Push the address of the first argument */
        printf( "\tmovl %%ebx,%%eax\n" );
        printf( "\taddl $10,%%eax\n" );
        printf( "\tpushl $%d\n", reg_func ? 7 : strlen(args) );
        printf( "\tpushl %%eax\n" );
        printf( "\tcall " PREFIX "RELAY_DebugCall16\n" );
        printf( "\tpopl %%eax\n" );
        printf( "\tpopl %%eax\n" );
    }

    /* Switch to the 16-bit stack */

    printf( "\tmovw " PREFIX "IF1632_Saved16_ss,%%ss\n" );
    printf( "\tmovw " PREFIX "IF1632_Saved16_sp,%%sp\n" );
    printf( "\tmovzwl " PREFIX "IF1632_Saved16_bp,%%ebp\n" );

    /* Transfer the arguments */

    if (reg_func)
    {
        /* Get the registers. ebx is handled later on. */
        printf( "\tmovl 18(%%ebx),%%es\n" );
        printf( "\tmovl 22(%%ebx),%%eax\n" );
        printf( "\tmovl 30(%%ebx),%%ecx\n" );
        printf( "\tmovl 34(%%ebx),%%edx\n" );
        printf( "\tmovl 38(%%ebx),%%esi\n" );
        printf( "\tmovl 42(%%ebx),%%edi\n" );
    }
    else  /* not a register function */
    {
        int pos = 18;  /* first argument position */
        while (*args)
        {
            switch(*args++)
            {
            case 'w': /* word */
                printf( "\tpushw %d(%%ebx)\n", pos );
                break;
            case 'l': /* long */
                printf( "\tpushl %d(%%ebx)\n", pos );
                break;
            }
            pos += 4;
        }
    }

    /* Push the return address */

    printf( "\tpushl " PREFIX "CALL16_RetAddr_%s\n",
            short_ret ? "word" : "long" );

    /* Push the called routine address */

    printf( "\tpushl 10(%%ebx)\n" );

    /* Get the 16-bit ds */
    /* FIXME: this shouldn't be necessary if function prologs fixup worked. */

    printf( "\tmovw 14(%%ebx),%%ds\n" );

    if (reg_func)
    {
        /* Retrieve ebx from the 32-bit stack */
        printf( "\tmovl %%fs:26(%%ebx),%%ebx\n" );
    }
    else
    {
        /* Set ax equal to ds for window procedures */
        printf( "\tmovw %%ds,%%ax\n" );
    }

    /* Jump to the called routine */

    printf( "\t.byte 0x66\n" );
    printf( "\tlret\n" );
}


/*******************************************************************
 *         BuildRet16Func
 *
 * Build the return code for 16-bit callbacks
 */
static void BuildRet16Func()
{
    printf( "\t.globl " PREFIX "CALL16_Ret_word\n" );
    printf( "\t.globl " PREFIX "CALL16_Ret_long\n" );

    /* Put return value into eax */

    printf( PREFIX "CALL16_Ret_long:\n" );
    printf( "\tpushw %%dx\n" );
    printf( "\tpushw %%ax\n" );
    printf( "\tpopl %%eax\n" );
    printf( PREFIX "CALL16_Ret_word:\n" );

    /* Restore 32-bit segment registers */

    printf( "\tmovw $0x%04x,%%bx\n", WINE_DATA_SELECTOR );
    printf( "\tmovw %%bx,%%ds\n" );
    printf( "\tmovw %%bx,%%es\n" );
    printf( "\tmovw %%bx,%%ss\n" );

    /* Restore the 32-bit stack */

    printf( "\tmovl " PREFIX "IF1632_Saved32_esp,%%esp\n" );
    printf( "\tmovl " PREFIX "IF1632_Saved32_ebp,%%ebp\n" );
    printf( "\tpopl " PREFIX "IF1632_Saved32_ebp\n" );
    printf( "\tpopl " PREFIX "IF1632_Saved32_esp\n" );

    /* Restore the 32-bit registers */

    printf( "\tpopl %%edi\n" );
    printf( "\tpopl %%esi\n" );
    printf( "\tpopl %%edx\n" );
    printf( "\tpopl %%ecx\n" );
    printf( "\tpopl %%ebx\n" );

    /* Return to caller */

    printf( "\tmovl %%ebp,%%esp\n" );
    printf( "\tpopl %%ebp\n" );
    printf( "\tlret\n" );

    /* Declare the return address variables */

    printf( "\t.data\n" );
    printf( "\t.globl " PREFIX "CALL16_RetAddr_word\n" );
    printf( "\t.globl " PREFIX "CALL16_RetAddr_long\n" );
    printf( PREFIX "CALL16_RetAddr_word:\t.long 0\n" );
    printf( PREFIX "CALL16_RetAddr_long:\t.long 0\n" );
    printf( "\t.text\n" );
}


static void usage(void)
{
    fprintf(stderr, "usage: build -spec SPECNAMES\n"
                    "       build -call32 FUNCTION_PROFILES\n"
                    "       build -call16 FUNCTION_PROFILES\n" );
    exit(1);
}


int main(int argc, char **argv)
{
    int i;

    if (argc <= 2) usage();

    if (!strcmp( argv[1], "-spec" ))
    {
        for (i = 2; i < argc; i++) BuildSpecFiles( argv[i] );
    }
    else if (!strcmp( argv[1], "-call32" ))  /* 32-bit callbacks */
    {
        /* File header */

        printf( "/* File generated automatically. Do no edit! */\n\n" );
        printf( "\t.text\n" );

        /* Build the callback functions */

        for (i = 2; i < argc; i++) BuildCall32Func( argv[i] );

        /* Output the argument debugging strings */

        if (debugging)
        {
            printf( "/* Argument strings */\n" );
            for (i = 2; i < argc; i++)
            {
                printf( "CALL32_Str_%s:\n", argv[i] );
                printf( "\t.ascii \"%s\\0\"\n", argv[i] + 5 );
            }
        }
    }
    else if (!strcmp( argv[1], "-call16" ))  /* 16-bit callbacks */
    {
        /* File header */

        printf( "/* File generated automatically. Do no edit! */\n\n" );
        printf( "\t.text\n" );
        printf( "\t.globl " PREFIX "CALL16_Start\n" );
        printf( PREFIX "CALL16_Start:\n" );

        /* Build the callback functions */

        for (i = 2; i < argc; i++) BuildCall16Func( argv[i] );

        /* Output the 16-bit return code */

        BuildRet16Func();

        printf( "\t.globl " PREFIX "CALL16_End\n" );
        printf( PREFIX "CALL16_End:\n" );
    }
    else usage();

    return 0;
}