outobj.c
资源名称:nasm-0.98.zip [点击查看]
上传用户:yuppie_zhu
上传日期:2007-01-08
资源大小:535k
文件大小:66k
源码类别:
编译器/解释器
开发平台:
C/C++
- /* outobj.c output routines for the Netwide Assembler to produce
- * .OBJ object files
- *
- * The Netwide Assembler is copyright (C) 1996 Simon Tatham and
- * Julian Hall. All rights reserved. The software is
- * redistributable under the licence given in the file "Licence"
- * distributed in the NASM archive.
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <ctype.h>
- #include "nasm.h"
- #include "nasmlib.h"
- #include "outform.h"
- #ifdef OF_OBJ
- /*
- * outobj.c is divided into two sections. The first section is low level
- * routines for creating obj records; It has nearly zero NASM specific
- * code. The second section is high level routines for processing calls and
- * data structures from the rest of NASM into obj format.
- *
- * It should be easy (though not zero work) to lift the first section out for
- * use as an obj file writer for some other assembler or compiler.
- */
- /*
- * These routines are built around the ObjRecord data struture. An ObjRecord
- * holds an object file record that may be under construction or complete.
- *
- * A major function of these routines is to support continuation of an obj
- * record into the next record when the maximum record size is exceeded. The
- * high level code does not need to worry about where the record breaks occur.
- * It does need to do some minor extra steps to make the automatic continuation
- * work. Those steps may be skipped for records where the high level knows no
- * continuation could be required.
- *
- * 1) An ObjRecord is allocated and cleared by obj_new, or an existing ObjRecord
- * is cleared by obj_clear.
- *
- * 2) The caller should fill in .type.
- *
- * 3) If the record is continuable and there is processing that must be done at
- * the start of each record then the caller should fill in .ori with the
- * address of the record initializer routine.
- *
- * 4) If the record is continuable and it should be saved (rather than emitted
- * immediately) as each record is done, the caller should set .up to be a
- * pointer to a location in which the caller keeps the master pointer to the
- * ObjRecord. When the record is continued, the obj_bump routine will then
- * allocate a new ObjRecord structure and update the master pointer.
- *
- * 5) If the .ori field was used then the caller should fill in the .parm with
- * any data required by the initializer.
- *
- * 6) The caller uses the routines: obj_byte, obj_word, obj_rword, obj_dword,
- * obj_x, obj_index, obj_value and obj_name to fill in the various kinds of
- * data required for this record.
- *
- * 7) If the record is continuable, the caller should call obj_commit at each
- * point where breaking the record is permitted.
- *
- * 8) To write out the record, the caller should call obj_emit2. If the
- * caller has called obj_commit for all data written then he can get slightly
- * faster code by calling obj_emit instead of obj_emit2.
- *
- * Most of these routines return an ObjRecord pointer. This will be the input
- * pointer most of the time and will be the new location if the ObjRecord
- * moved as a result of the call. The caller may ignore the return value in
- * three cases: It is a "Never Reallocates" routine; or The caller knows
- * continuation is not possible; or The caller uses the master pointer for the
- * next operation.
- */
- #define RECORD_MAX 1024 /* maximum size of _any_ record */
- #define OBJ_PARMS 3 /* maximum .parm used by any .ori routine */
- #define FIX_08_LOW 0x8000 /* location type for various fixup subrecords */
- #define FIX_16_OFFSET 0x8400
- #define FIX_16_SELECTOR 0x8800
- #define FIX_32_POINTER 0x8C00
- #define FIX_08_HIGH 0x9000
- #define FIX_32_OFFSET 0xA400
- #define FIX_48_POINTER 0xAC00
- enum RecordID { /* record ID codes */
- THEADR = 0x80, /* module header */
- COMENT = 0x88, /* comment record */
- LINNUM = 0x94, /* line number record */
- LNAMES = 0x96, /* list of names */
- SEGDEF = 0x98, /* segment definition */
- GRPDEF = 0x9A, /* group definition */
- EXTDEF = 0x8C, /* external definition */
- PUBDEF = 0x90, /* public definition */
- COMDEF = 0xB0, /* common definition */
- LEDATA = 0xA0, /* logical enumerated data */
- FIXUPP = 0x9C, /* fixups (relocations) */
- MODEND = 0x8A /* module end */
- };
- enum ComentID { /* ID codes for comment records */
- dEXTENDED = 0xA1, /* tells that we are using translator-specific extensions */
- dLINKPASS = 0xA2, /* link pass 2 marker */
- dTYPEDEF = 0xE3, /* define a type */
- dSYM = 0xE6, /* symbol debug record */
- dFILNAME = 0xE8, /* file name record */
- dCOMPDEF = 0xEA /* compiler type info */
- };
- typedef struct ObjRecord ObjRecord;
- typedef void ORI(ObjRecord *orp);
- struct ObjRecord {
- ORI *ori; /* Initialization routine */
- int used; /* Current data size */
- int committed; /* Data size at last boundary */
- int x_size; /* (see obj_x) */
- unsigned int type; /* Record type */
- ObjRecord *child; /* Associated record below this one */
- ObjRecord **up; /* Master pointer to this ObjRecord */
- ObjRecord *back; /* Previous part of this record */
- unsigned long parm[OBJ_PARMS]; /* Parameters for ori routine */
- unsigned char buf[RECORD_MAX];
- };
- static void obj_fwrite(ObjRecord *orp);
- static void ori_ledata(ObjRecord *orp);
- static void ori_pubdef(ObjRecord *orp);
- static void ori_null(ObjRecord *orp);
- static ObjRecord *obj_commit(ObjRecord *orp);
- static void obj_write_fixup (ObjRecord *orp, int bytes,
- int segrel, long seg, long wrt);
- static int obj_uppercase; /* Flag: all names in uppercase */
- /*
- * Clear an ObjRecord structure. (Never reallocates).
- * To simplify reuse of ObjRecord's, .type, .ori and .parm are not cleared.
- */
- static ObjRecord *obj_clear(ObjRecord *orp)
- {
- orp->used = 0;
- orp->committed = 0;
- orp->x_size = 0;
- orp->child = NULL;
- orp->up = NULL;
- orp->back = NULL;
- return (orp);
- }
- /*
- * Emit an ObjRecord structure. (Never reallocates).
- * The record is written out preceeded (recursively) by its previous part (if
- * any) and followed (recursively) by its child (if any).
- * The previous part and the child are freed. The main ObjRecord is cleared,
- * not freed.
- */
- static ObjRecord *obj_emit(ObjRecord *orp)
- {
- if (orp->back) {
- obj_emit(orp->back);
- nasm_free(orp->back);
- }
- if (orp->committed)
- obj_fwrite(orp);
- if (orp->child) {
- obj_emit(orp->child);
- nasm_free(orp->child);
- }
- return (obj_clear(orp));
- }
- /*
- * Commit and Emit a record. (Never reallocates).
- */
- static ObjRecord *obj_emit2(ObjRecord *orp)
- {
- obj_commit(orp);
- return (obj_emit(orp));
- }
- /*
- * Allocate and clear a new ObjRecord; Also sets .ori to ori_null
- */
- static ObjRecord *obj_new(void)
- {
- ObjRecord *orp;
- orp = obj_clear( nasm_malloc(sizeof(ObjRecord)) );
- orp->ori = ori_null;
- return (orp);
- }
- /*
- * Advance to the next record because the existing one is full or its x_size
- * is incompatible.
- * Any uncommited data is moved into the next record.
- */
- static ObjRecord *obj_bump(ObjRecord *orp)
- {
- ObjRecord *nxt;
- int used = orp->used;
- int committed = orp->committed;
- if (orp->up) {
- *orp->up = nxt = obj_new();
- nxt->ori = orp->ori;
- nxt->type = orp->type;
- nxt->up = orp->up;
- nxt->back = orp;
- memcpy( nxt->parm, orp->parm, sizeof(orp->parm));
- } else
- nxt = obj_emit(orp);
- used -= committed;
- if (used) {
- nxt->committed = 1;
- nxt->ori (nxt);
- nxt->committed = nxt->used;
- memcpy( nxt->buf + nxt->committed, orp->buf + committed, used);
- nxt->used = nxt->committed + used;
- }
- return (nxt);
- }
- /*
- * Advance to the next record if necessary to allow the next field to fit.
- */
- static ObjRecord *obj_check(ObjRecord *orp, int size)
- {
- if (orp->used + size > RECORD_MAX)
- orp = obj_bump(orp);
- if (!orp->committed) {
- orp->committed = 1;
- orp->ori (orp);
- orp->committed = orp->used;
- }
- return (orp);
- }
- /*
- * All data written so far is commited to the current record (won't be moved to
- * the next record in case of continuation).
- */
- static ObjRecord *obj_commit(ObjRecord *orp)
- {
- orp->committed = orp->used;
- return (orp);
- }
- /*
- * Write a byte
- */
- static ObjRecord *obj_byte(ObjRecord *orp, unsigned char val)
- {
- orp = obj_check(orp, 1);
- orp->buf[orp->used] = val;
- orp->used++;
- return (orp);
- }
- /*
- * Write a word
- */
- static ObjRecord *obj_word(ObjRecord *orp, unsigned int val)
- {
- orp = obj_check(orp, 2);
- orp->buf[orp->used] = val;
- orp->buf[orp->used+1] = val >> 8;
- orp->used += 2;
- return (orp);
- }
- /*
- * Write a reversed word
- */
- static ObjRecord *obj_rword(ObjRecord *orp, unsigned int val)
- {
- orp = obj_check(orp, 2);
- orp->buf[orp->used] = val >> 8;
- orp->buf[orp->used+1] = val;
- orp->used += 2;
- return (orp);
- }
- /*
- * Write a dword
- */
- static ObjRecord *obj_dword(ObjRecord *orp, unsigned long val)
- {
- orp = obj_check(orp, 4);
- orp->buf[orp->used] = val;
- orp->buf[orp->used+1] = val >> 8;
- orp->buf[orp->used+2] = val >> 16;
- orp->buf[orp->used+3] = val >> 24;
- orp->used += 4;
- return (orp);
- }
- /*
- * All fields of "size x" in one obj record must be the same size (either 16
- * bits or 32 bits). There is a one bit flag in each record which specifies
- * which.
- * This routine is used to force the current record to have the desired
- * x_size. x_size is normally automatic (using obj_x), so that this
- * routine should be used outside obj_x, only to provide compatibility with
- * linkers that have bugs in their processing of the size bit.
- */
- static ObjRecord *obj_force(ObjRecord *orp, int x)
- {
- if (orp->x_size == (x^48))
- orp = obj_bump(orp);
- orp->x_size = x;
- return (orp);
- }
- /*
- * This routine writes a field of size x. The caller does not need to worry at
- * all about whether 16-bits or 32-bits are required.
- */
- static ObjRecord *obj_x(ObjRecord *orp, unsigned long val)
- {
- if (orp->type & 1)
- orp->x_size = 32;
- if (val > 0xFFFF)
- orp = obj_force(orp, 32);
- if (orp->x_size == 32)
- return (obj_dword(orp, val));
- orp->x_size = 16;
- return (obj_word(orp, val));
- }
- /*
- * Writes an index
- */
- static ObjRecord *obj_index(ObjRecord *orp, unsigned int val)
- {
- if (val < 128)
- return ( obj_byte(orp, val) );
- return (obj_word(orp, (val>>8) | (val<<8) | 0x80));
- }
- /*
- * Writes a variable length value
- */
- static ObjRecord *obj_value(ObjRecord *orp, unsigned long val)
- {
- if (val <= 128)
- return ( obj_byte(orp, val) );
- if (val <= 0xFFFF) {
- orp = obj_byte(orp, 129);
- return ( obj_word(orp, val) );
- }
- if (val <= 0xFFFFFF)
- return ( obj_dword(orp, (val<<8) + 132 ) );
- orp = obj_byte(orp, 136);
- return ( obj_dword(orp, val) );
- }
- /*
- * Writes a counted string
- */
- static ObjRecord *obj_name(ObjRecord *orp, char *name)
- {
- int len = strlen(name);
- unsigned char *ptr;
- orp = obj_check(orp, len+1);
- ptr = orp->buf + orp->used;
- *ptr++ = len;
- orp->used += len+1;
- if (obj_uppercase)
- while (--len >= 0) {
- *ptr++ = toupper(*name);
- name++;
- } else
- memcpy(ptr, name, len);
- return (orp);
- }
- /*
- * Initializer for an LEDATA record.
- * parm[0] = offset
- * parm[1] = segment index
- * During the use of a LEDATA ObjRecord, parm[0] is constantly updated to
- * represent the offset that would be required if the record were split at the
- * last commit point.
- * parm[2] is a copy of parm[0] as it was when the current record was initted.
- */
- static void ori_ledata(ObjRecord *orp)
- {
- obj_index (orp, orp->parm[1]);
- orp->parm[2] = orp->parm[0];
- obj_x (orp, orp->parm[0]);
- }
- /*
- * Initializer for a PUBDEF record.
- * parm[0] = group index
- * parm[1] = segment index
- * parm[2] = frame (only used when both indexes are zero)
- */
- static void ori_pubdef(ObjRecord *orp)
- {
- obj_index (orp, orp->parm[0]);
- obj_index (orp, orp->parm[1]);
- if ( !(orp->parm[0] | orp->parm[1]) )
- obj_word (orp, orp->parm[2]);
- }
- /*
- * Initializer for a LINNUM record.
- * parm[0] = group index
- * parm[1] = segment index
- */
- static void ori_linnum(ObjRecord *orp)
- {
- obj_index (orp, orp->parm[0]);
- obj_index (orp, orp->parm[1]);
- }
- /*
- * Initializer for a local vars record.
- */
- static void ori_local(ObjRecord *orp)
- {
- obj_byte (orp, 0x40);
- obj_byte (orp, dSYM);
- }
- /*
- * Null initializer for records that continue without any header info
- */
- static void ori_null(ObjRecord *orp)
- {
- (void) orp; /* Do nothing */
- }
- /*
- * This concludes the low level section of outobj.c
- */
- static char obj_infile[FILENAME_MAX];
- static efunc error;
- static evalfunc evaluate;
- static ldfunc deflabel;
- static FILE *ofp;
- static long first_seg;
- static int any_segs;
- static int passtwo;
- static int arrindex;
- #define GROUP_MAX 256 /* we won't _realistically_ have more
- * than this many segs in a group */
- #define EXT_BLKSIZ 256 /* block size for externals list */
- struct Segment; /* need to know these structs exist */
- struct Group;
- struct LineNumber {
- struct LineNumber *next;
- struct Segment *segment;
- long offset;
- long lineno;
- };
- static struct FileName {
- struct FileName *next;
- char *name;
- struct LineNumber *lnhead, **lntail;
- int index;
- } *fnhead, **fntail;
- static struct Array {
- struct Array *next;
- unsigned size;
- int basetype;
- } *arrhead, **arrtail;
- #define ARRAYBOT 31 /* magic number for first array index */
- static struct Public {
- struct Public *next;
- char *name;
- long offset;
- long segment; /* only if it's far-absolute */
- int type; /* only for local debug syms */
- } *fpubhead, **fpubtail, *last_defined;
- static struct External {
- struct External *next;
- char *name;
- long commonsize;
- long commonelem; /* element size if FAR, else zero */
- int index; /* OBJ-file external index */
- enum {
- DEFWRT_NONE, /* no unusual default-WRT */
- DEFWRT_STRING, /* a string we don't yet understand */
- DEFWRT_SEGMENT, /* a segment */
- DEFWRT_GROUP /* a group */
- } defwrt_type;
- union {
- char *string;
- struct Segment *seg;
- struct Group *grp;
- } defwrt_ptr;
- struct External *next_dws; /* next with DEFWRT_STRING */
- } *exthead, **exttail, *dws;
- static int externals;
- static struct ExtBack {
- struct ExtBack *next;
- struct External *exts[EXT_BLKSIZ];
- } *ebhead, **ebtail;
- static struct Segment {
- struct Segment *next;
- long index; /* the NASM segment id */
- long obj_index; /* the OBJ-file segment index */
- struct Group *grp; /* the group it belongs to */
- unsigned long currentpos;
- long align; /* can be SEG_ABS + absolute addr */
- enum {
- CMB_PRIVATE = 0,
- CMB_PUBLIC = 2,
- CMB_STACK = 5,
- CMB_COMMON = 6
- } combine;
- long use32; /* is this segment 32-bit? */
- struct Public *pubhead, **pubtail, *lochead, **loctail;
- char *name;
- char *segclass, *overlay; /* `class' is a C++ keyword :-) */
- ObjRecord *orp;
- } *seghead, **segtail, *obj_seg_needs_update;
- static struct Group {
- struct Group *next;
- char *name;
- long index; /* NASM segment id */
- long obj_index; /* OBJ-file group index */
- long nentries; /* number of elements... */
- long nindices; /* ...and number of index elts... */
- union {
- long index;
- char *name;
- } segs[GROUP_MAX]; /* ...in this */
- } *grphead, **grptail, *obj_grp_needs_update;
- static struct ImpDef {
- struct ImpDef *next;
- char *extname;
- char *libname;
- unsigned int impindex;
- char *impname;
- } *imphead, **imptail;
- static struct ExpDef {
- struct ExpDef *next;
- char *intname;
- char *extname;
- unsigned int ordinal;
- int flags;
- } *exphead, **exptail;
- #define EXPDEF_FLAG_ORDINAL 0x80
- #define EXPDEF_FLAG_RESIDENT 0x40
- #define EXPDEF_FLAG_NODATA 0x20
- #define EXPDEF_MASK_PARMCNT 0x1F
- static long obj_entry_seg, obj_entry_ofs;
- struct ofmt of_obj;
- static long obj_segment (char *, int, int *);
- static void obj_write_file(int debuginfo);
- static int obj_directive (char *, char *, int);
- static void obj_init (FILE *fp, efunc errfunc, ldfunc ldef, evalfunc eval)
- {
- ofp = fp;
- error = errfunc;
- evaluate = eval;
- deflabel = ldef;
- first_seg = seg_alloc();
- any_segs = FALSE;
- fpubhead = NULL;
- fpubtail = &fpubhead;
- exthead = NULL;
- exttail = &exthead;
- imphead = NULL;
- imptail = &imphead;
- exphead = NULL;
- exptail = &exphead;
- dws = NULL;
- externals = 0;
- ebhead = NULL;
- ebtail = &ebhead;
- seghead = obj_seg_needs_update = NULL;
- segtail = &seghead;
- grphead = obj_grp_needs_update = NULL;
- grptail = &grphead;
- obj_entry_seg = NO_SEG;
- obj_uppercase = FALSE;
- passtwo = 0;
- of_obj.current_dfmt->init (&of_obj,NULL,fp,errfunc);
- }
- static int obj_set_info(enum geninfo type, char **val)
- {
- (void) type;
- (void) val;
- return 0;
- }
- static void obj_cleanup (int debuginfo)
- {
- obj_write_file(debuginfo);
- of_obj.current_dfmt->cleanup();
- fclose (ofp);
- while (seghead) {
- struct Segment *segtmp = seghead;
- seghead = seghead->next;
- while (segtmp->pubhead) {
- struct Public *pubtmp = segtmp->pubhead;
- segtmp->pubhead = pubtmp->next;
- nasm_free (pubtmp->name);
- nasm_free (pubtmp);
- }
- nasm_free (segtmp->segclass);
- nasm_free (segtmp->overlay);
- nasm_free (segtmp);
- }
- while (fpubhead) {
- struct Public *pubtmp = fpubhead;
- fpubhead = fpubhead->next;
- nasm_free (pubtmp->name);
- nasm_free (pubtmp);
- }
- while (exthead) {
- struct External *exttmp = exthead;
- exthead = exthead->next;
- nasm_free (exttmp);
- }
- while (imphead) {
- struct ImpDef *imptmp = imphead;
- imphead = imphead->next;
- nasm_free (imptmp->extname);
- nasm_free (imptmp->libname);
- nasm_free (imptmp->impname); /* nasm_free won't mind if it's NULL */
- nasm_free (imptmp);
- }
- while (exphead) {
- struct ExpDef *exptmp = exphead;
- exphead = exphead->next;
- nasm_free (exptmp->extname);
- nasm_free (exptmp->intname);
- nasm_free (exptmp);
- }
- while (ebhead) {
- struct ExtBack *ebtmp = ebhead;
- ebhead = ebhead->next;
- nasm_free (ebtmp);
- }
- while (grphead) {
- struct Group *grptmp = grphead;
- grphead = grphead->next;
- nasm_free (grptmp);
- }
- }
- static void obj_ext_set_defwrt (struct External *ext, char *id)
- {
- struct Segment *seg;
- struct Group *grp;
- for (seg = seghead; seg; seg = seg->next)
- if (!strcmp(seg->name, id)) {
- ext->defwrt_type = DEFWRT_SEGMENT;
- ext->defwrt_ptr.seg = seg;
- nasm_free (id);
- return;
- }
- for (grp = grphead; grp; grp = grp->next)
- if (!strcmp(grp->name, id)) {
- ext->defwrt_type = DEFWRT_GROUP;
- ext->defwrt_ptr.grp = grp;
- nasm_free (id);
- return;
- }
- ext->defwrt_type = DEFWRT_STRING;
- ext->defwrt_ptr.string = id;
- ext->next_dws = dws;
- dws = ext;
- }
- static void obj_deflabel (char *name, long segment,
- long offset, int is_global, char *special)
- {
- /*
- * We have three cases:
- *
- * (i) `segment' is a segment-base. If so, set the name field
- * for the segment or group structure it refers to, and then
- * return.
- *
- * (ii) `segment' is one of our segments, or a SEG_ABS segment.
- * Save the label position for later output of a PUBDEF record.
- * (Or a MODPUB, if we work out how.)
- *
- * (iii) `segment' is not one of our segments. Save the label
- * position for later output of an EXTDEF, and also store a
- * back-reference so that we can map later references to this
- * segment number to the external index.
- */
- struct External *ext;
- struct ExtBack *eb;
- struct Segment *seg;
- int i;
- int used_special = FALSE; /* have we used the special text? */
- /*
- * If it's a special-retry from pass two, discard it.
- */
- if (is_global == 3)
- return;
- /*
- * First check for the double-period, signifying something
- * unusual.
- */
- if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
- if (!strcmp(name, "..start")) {
- obj_entry_seg = segment;
- obj_entry_ofs = offset;
- return;
- }
- error (ERR_NONFATAL, "unrecognised special symbol `%s'", name);
- }
- /*
- * Case (i):
- */
- if (obj_seg_needs_update) {
- obj_seg_needs_update->name = name;
- return;
- } else if (obj_grp_needs_update) {
- obj_grp_needs_update->name = name;
- return;
- }
- if (segment < SEG_ABS && segment != NO_SEG && segment % 2)
- return;
- if (segment >= SEG_ABS || segment == NO_SEG) {
- /*
- * SEG_ABS subcase of (ii).
- */
- if (is_global) {
- struct Public *pub;
- pub = *fpubtail = nasm_malloc(sizeof(*pub));
- fpubtail = &pub->next;
- pub->next = NULL;
- pub->name = nasm_strdup(name);
- pub->offset = offset;
- pub->segment = (segment == NO_SEG ? 0 : segment & ~SEG_ABS);
- }
- if (special)
- error(ERR_NONFATAL, "OBJ supports no special symbol features"
- " for this symbol type");
- return;
- }
- /*
- * If `any_segs' is still FALSE, we might need to define a
- * default segment, if they're trying to declare a label in
- * `first_seg'.
- */
- if (!any_segs && segment == first_seg) {
- int tempint; /* ignored */
- if (segment != obj_segment("__NASMDEFSEG", 2, &tempint))
- error (ERR_PANIC, "strange segment conditions in OBJ driver");
- }
- for (seg = seghead; seg && is_global; seg = seg->next)
- if (seg->index == segment) {
- struct Public *loc = nasm_malloc (sizeof(*loc));
- /*
- * Case (ii). Maybe MODPUB someday?
- */
- *seg->pubtail = loc;
- seg->pubtail = &loc->next;
- loc->next = NULL;
- loc->name = nasm_strdup(name);
- loc->offset = offset;
- if (special)
- error(ERR_NONFATAL, "OBJ supports no special symbol features"
- " for this symbol type");
- return;
- }
- /*
- * Case (iii).
- */
- if (is_global) {
- ext = *exttail = nasm_malloc(sizeof(*ext));
- ext->next = NULL;
- exttail = &ext->next;
- ext->name = name;
- ext->defwrt_type = DEFWRT_NONE;
- if (is_global == 2) {
- ext->commonsize = offset;
- ext->commonelem = 1; /* default FAR */
- } else
- ext->commonsize = 0;
- }
- else
- return;
- /*
- * Now process the special text, if any, to find default-WRT
- * specifications and common-variable element-size and near/far
- * specifications.
- */
- while (special && *special) {
- used_special = TRUE;
- /*
- * We might have a default-WRT specification.
- */
- if (!nasm_strnicmp(special, "wrt", 3)) {
- char *p;
- int len;
- special += 3;
- special += strspn(special, " t");
- p = nasm_strndup(special, len = strcspn(special, ":"));
- obj_ext_set_defwrt (ext, p);
- special += len;
- if (*special && *special != ':')
- error(ERR_NONFATAL, "`:' expected in special symbol"
- " text for `%s'", ext->name);
- else if (*special == ':')
- special++;
- }
- /*
- * The NEAR or FAR keywords specify nearness or
- * farness. FAR gives default element size 1.
- */
- if (!nasm_strnicmp(special, "far", 3)) {
- if (ext->commonsize)
- ext->commonelem = 1;
- else
- error(ERR_NONFATAL, "`%s': `far' keyword may only be applied"
- " to common variablesn", ext->name);
- special += 3;
- special += strspn(special, " t");
- } else if (!nasm_strnicmp(special, "near", 4)) {
- if (ext->commonsize)
- ext->commonelem = 0;
- else
- error(ERR_NONFATAL, "`%s': `far' keyword may only be applied"
- " to common variablesn", ext->name);
- special += 4;
- special += strspn(special, " t");
- }
- /*
- * If it's a common, and anything else remains on the line
- * before a further colon, evaluate it as an expression and
- * use that as the element size. Forward references aren't
- * allowed.
- */
- if (*special == ':')
- special++;
- else if (*special) {
- if (ext->commonsize) {
- expr *e;
- struct tokenval tokval;
- stdscan_reset();
- stdscan_bufptr = special;
- tokval.t_type = TOKEN_INVALID;
- e = evaluate(stdscan, NULL, &tokval, NULL, 1, error, NULL);
- if (e) {
- if (!is_simple(e))
- error (ERR_NONFATAL, "cannot use relocatable"
- " expression as common-variable element size");
- else
- ext->commonelem = reloc_value(e);
- }
- special = stdscan_bufptr;
- } else {
- error (ERR_NONFATAL, "`%s': element-size specifications only"
- " apply to common variables", ext->name);
- while (*special && *special != ':')
- special++;
- if (*special == ':')
- special++;
- }
- }
- }
- i = segment/2;
- eb = ebhead;
- if (!eb) {
- eb = *ebtail = nasm_malloc(sizeof(*eb));
- eb->next = NULL;
- ebtail = &eb->next;
- }
- while (i > EXT_BLKSIZ) {
- if (eb && eb->next)
- eb = eb->next;
- else {
- eb = *ebtail = nasm_malloc(sizeof(*eb));
- eb->next = NULL;
- ebtail = &eb->next;
- }
- i -= EXT_BLKSIZ;
- }
- eb->exts[i] = ext;
- ext->index = ++externals;
- if (special && !used_special)
- error(ERR_NONFATAL, "OBJ supports no special symbol features"
- " for this symbol type");
- }
- static void obj_out (long segto, void *data, unsigned long type,
- long segment, long wrt)
- {
- long size, realtype;
- unsigned char *ucdata;
- long ldata;
- struct Segment *seg;
- ObjRecord *orp;
- /*
- * handle absolute-assembly (structure definitions)
- */
- if (segto == NO_SEG) {
- if ((type & OUT_TYPMASK) != OUT_RESERVE)
- error (ERR_NONFATAL, "attempt to assemble code in [ABSOLUTE]"
- " space");
- return;
- }
- /*
- * If `any_segs' is still FALSE, we must define a default
- * segment.
- */
- if (!any_segs) {
- int tempint; /* ignored */
- if (segto != obj_segment("__NASMDEFSEG", 2, &tempint))
- error (ERR_PANIC, "strange segment conditions in OBJ driver");
- }
- /*
- * Find the segment we are targetting.
- */
- for (seg = seghead; seg; seg = seg->next)
- if (seg->index == segto)
- break;
- if (!seg)
- error (ERR_PANIC, "code directed to nonexistent segment?");
- orp = seg->orp;
- orp->parm[0] = seg->currentpos;
- size = type & OUT_SIZMASK;
- realtype = type & OUT_TYPMASK;
- if (realtype == OUT_RAWDATA) {
- ucdata = data;
- while (size > 0) {
- unsigned int len;
- orp = obj_check(seg->orp, 1);
- len = RECORD_MAX - orp->used;
- if (len > size)
- len = size;
- memcpy (orp->buf+orp->used, ucdata, len);
- orp->committed = orp->used += len;
- orp->parm[0] = seg->currentpos += len;
- ucdata += len;
- size -= len;
- }
- }
- else if (realtype == OUT_ADDRESS || realtype == OUT_REL2ADR ||
- realtype == OUT_REL4ADR)
- {
- int rsize;
- if (segment == NO_SEG && realtype != OUT_ADDRESS)
- error(ERR_NONFATAL, "relative call to absolute address not"
- " supported by OBJ format");
- if (segment >= SEG_ABS)
- error(ERR_NONFATAL, "far-absolute relocations not supported"
- " by OBJ format");
- ldata = *(long *)data;
- if (realtype == OUT_REL2ADR) {
- ldata += (size-2);
- size = 2;
- }
- if (realtype == OUT_REL4ADR) {
- ldata += (size-4);
- size = 4;
- }
- if (size == 2)
- orp = obj_word (orp, ldata);
- else
- orp = obj_dword (orp, ldata);
- rsize = size;
- if (segment < SEG_ABS && (segment != NO_SEG && segment % 2) &&
- size == 4) {
- /*
- * This is a 4-byte segment-base relocation such as
- * `MOV EAX,SEG foo'. OBJ format can't actually handle
- * these, but if the constant term has the 16 low bits
- * zero, we can just apply a 2-byte segment-base
- * relocation to the low word instead.
- */
- rsize = 2;
- if (ldata & 0xFFFF)
- error(ERR_NONFATAL, "OBJ format cannot handle complex"
- " dword-size segment base references");
- }
- if (segment != NO_SEG)
- obj_write_fixup (orp, rsize,
- (realtype == OUT_ADDRESS ? 0x4000 : 0),
- segment, wrt);
- seg->currentpos += size;
- } else if (realtype == OUT_RESERVE) {
- if (orp->committed)
- orp = obj_bump(orp);
- seg->currentpos += size;
- }
- obj_commit(orp);
- }
- static void obj_write_fixup (ObjRecord *orp, int bytes,
- int segrel, long seg, long wrt)
- {
- int locat, method;
- int base;
- long tidx, fidx;
- struct Segment *s = NULL;
- struct Group *g = NULL;
- struct External *e = NULL;
- ObjRecord *forp;
- if (bytes == 1) {
- error(ERR_NONFATAL, "`obj' output driver does not support"
- " one-byte relocations");
- return;
- }
- forp = orp->child;
- if (forp == NULL) {
- orp->child = forp = obj_new();
- forp->up = &(orp->child);
- forp->type = FIXUPP;
- }
- if (seg % 2) {
- base = TRUE;
- locat = FIX_16_SELECTOR;
- seg--;
- if (bytes != 2)
- error(ERR_PANIC, "OBJ: 4-byte segment base fixup got"
- " through sanity check");
- }
- else {
- base = FALSE;
- locat = (bytes == 2) ? FIX_16_OFFSET : FIX_32_OFFSET;
- if (!segrel)
- /*
- * There is a bug in tlink that makes it process self relative
- * fixups incorrectly if the x_size doesn't match the location
- * size.
- */
- forp = obj_force(forp, bytes<<3);
- }
- forp = obj_rword (forp, locat | segrel | (orp->parm[0]-orp->parm[2]));
- tidx = fidx = -1, method = 0; /* placate optimisers */
- /*
- * See if we can find the segment ID in our segment list. If
- * so, we have a T4 (LSEG) target.
- */
- for (s = seghead; s; s = s->next)
- if (s->index == seg)
- break;
- if (s)
- method = 4, tidx = s->obj_index;
- else {
- for (g = grphead; g; g = g->next)
- if (g->index == seg)
- break;
- if (g)
- method = 5, tidx = g->obj_index;
- else {
- long i = seg/2;
- struct ExtBack *eb = ebhead;
- while (i > EXT_BLKSIZ) {
- if (eb)
- eb = eb->next;
- else
- break;
- i -= EXT_BLKSIZ;
- }
- if (eb)
- method = 6, e = eb->exts[i], tidx = e->index;
- else
- error(ERR_PANIC,
- "unrecognised segment value in obj_write_fixup");
- }
- }
- /*
- * If no WRT given, assume the natural default, which is method
- * F5 unless:
- *
- * - we are doing an OFFSET fixup for a grouped segment, in
- * which case we require F1 (group).
- *
- * - we are doing an OFFSET fixup for an external with a
- * default WRT, in which case we must honour the default WRT.
- */
- if (wrt == NO_SEG) {
- if (!base && s && s->grp)
- method |= 0x10, fidx = s->grp->obj_index;
- else if (!base && e && e->defwrt_type != DEFWRT_NONE) {
- if (e->defwrt_type == DEFWRT_SEGMENT)
- method |= 0x00, fidx = e->defwrt_ptr.seg->obj_index;
- else if (e->defwrt_type == DEFWRT_GROUP)
- method |= 0x10, fidx = e->defwrt_ptr.grp->obj_index;
- else {
- error(ERR_NONFATAL, "default WRT specification for"
- " external `%s' unresolved", e->name);
- method |= 0x50, fidx = -1; /* got to do _something_ */
- }
- } else
- method |= 0x50, fidx = -1;
- } else {
- /*
- * See if we can find the WRT-segment ID in our segment
- * list. If so, we have a F0 (LSEG) frame.
- */
- for (s = seghead; s; s = s->next)
- if (s->index == wrt-1)
- break;
- if (s)
- method |= 0x00, fidx = s->obj_index;
- else {
- for (g = grphead; g; g = g->next)
- if (g->index == wrt-1)
- break;
- if (g)
- method |= 0x10, fidx = g->obj_index;
- else {
- long i = wrt/2;
- struct ExtBack *eb = ebhead;
- while (i > EXT_BLKSIZ) {
- if (eb)
- eb = eb->next;
- else
- break;
- i -= EXT_BLKSIZ;
- }
- if (eb)
- method |= 0x20, fidx = eb->exts[i]->index;
- else
- error(ERR_PANIC,
- "unrecognised WRT value in obj_write_fixup");
- }
- }
- }
- forp = obj_byte (forp, method);
- if (fidx != -1)
- forp = obj_index (forp, fidx);
- forp = obj_index (forp, tidx);
- obj_commit (forp);
- }
- static long obj_segment (char *name, int pass, int *bits)
- {
- /*
- * We call the label manager here to define a name for the new
- * segment, and when our _own_ label-definition stub gets
- * called in return, it should register the new segment name
- * using the pointer it gets passed. That way we save memory,
- * by sponging off the label manager.
- */
- if (!name) {
- *bits = 16;
- return first_seg;
- } else {
- struct Segment *seg;
- struct Group *grp;
- struct External **extp;
- int obj_idx, i, attrs, rn_error;
- char *p;
- /*
- * Look for segment attributes.
- */
- attrs = 0;
- while (*name == '.')
- name++; /* hack, but a documented one */
- p = name;
- while (*p && !isspace(*p))
- p++;
- if (*p) {
- *p++ = ' ';
- while (*p && isspace(*p))
- *p++ = ' ';
- }
- while (*p) {
- while (*p && !isspace(*p))
- p++;
- if (*p) {
- *p++ = ' ';
- while (*p && isspace(*p))
- *p++ = ' ';
- }
- attrs++;
- }
- obj_idx = 1;
- for (seg = seghead; seg; seg = seg->next) {
- obj_idx++;
- if (!strcmp(seg->name, name)) {
- if (attrs > 0 && pass == 1)
- error(ERR_WARNING, "segment attributes specified on"
- " redeclaration of segment: ignoring");
- if (seg->use32)
- *bits = 32;
- else
- *bits = 16;
- return seg->index;
- }
- }
- *segtail = seg = nasm_malloc(sizeof(*seg));
- seg->next = NULL;
- segtail = &seg->next;
- seg->index = (any_segs ? seg_alloc() : first_seg);
- seg->obj_index = obj_idx;
- seg->grp = NULL;
- any_segs = TRUE;
- seg->name = NULL;
- seg->currentpos = 0;
- seg->align = 1; /* default */
- seg->use32 = FALSE; /* default */
- seg->combine = CMB_PUBLIC; /* default */
- seg->segclass = seg->overlay = NULL;
- seg->pubhead = NULL;
- seg->pubtail = &seg->pubhead;
- seg->lochead = NULL;
- seg->loctail = &seg->lochead;
- seg->orp = obj_new();
- seg->orp->up = &(seg->orp);
- seg->orp->ori = ori_ledata;
- seg->orp->type = LEDATA;
- seg->orp->parm[1] = obj_idx;
- /*
- * Process the segment attributes.
- */
- p = name;
- while (attrs--) {
- p += strlen(p);
- while (!*p) p++;
- /*
- * `p' contains a segment attribute.
- */
- if (!nasm_stricmp(p, "private"))
- seg->combine = CMB_PRIVATE;
- else if (!nasm_stricmp(p, "public"))
- seg->combine = CMB_PUBLIC;
- else if (!nasm_stricmp(p, "common"))
- seg->combine = CMB_COMMON;
- else if (!nasm_stricmp(p, "stack"))
- seg->combine = CMB_STACK;
- else if (!nasm_stricmp(p, "use16"))
- seg->use32 = FALSE;
- else if (!nasm_stricmp(p, "use32"))
- seg->use32 = TRUE;
- else if (!nasm_stricmp(p, "flat")) {
- /*
- * This segment is an OS/2 FLAT segment. That means
- * that its default group is group FLAT, even if
- * the group FLAT does not explicitly _contain_ the
- * segment.
- *
- * When we see this, we must create the group
- * `FLAT', containing no segments, if it does not
- * already exist; then we must set the default
- * group of this segment to be the FLAT group.
- */
- struct Group *grp;
- for (grp = grphead; grp; grp = grp->next)
- if (!strcmp(grp->name, "FLAT"))
- break;
- if (!grp) {
- obj_directive ("group", "FLAT", 1);
- for (grp = grphead; grp; grp = grp->next)
- if (!strcmp(grp->name, "FLAT"))
- break;
- if (!grp)
- error (ERR_PANIC, "failure to define FLAT?!");
- }
- seg->grp = grp;
- } else if (!nasm_strnicmp(p, "class=", 6))
- seg->segclass = nasm_strdup(p+6);
- else if (!nasm_strnicmp(p, "overlay=", 8))
- seg->overlay = nasm_strdup(p+8);
- else if (!nasm_strnicmp(p, "align=", 6)) {
- seg->align = readnum(p+6, &rn_error);
- if (rn_error) {
- seg->align = 1;
- error (ERR_NONFATAL, "segment alignment should be"
- " numeric");
- }
- switch ((int) seg->align) {
- case 1: /* BYTE */
- case 2: /* WORD */
- case 4: /* DWORD */
- case 16: /* PARA */
- case 256: /* PAGE */
- case 4096: /* PharLap extension */
- break;
- case 8:
- error(ERR_WARNING, "OBJ format does not support alignment"
- " of 8: rounding up to 16");
- seg->align = 16;
- break;
- case 32:
- case 64:
- case 128:
- error(ERR_WARNING, "OBJ format does not support alignment"
- " of %d: rounding up to 256", seg->align);
- seg->align = 256;
- break;
- case 512:
- case 1024:
- case 2048:
- error(ERR_WARNING, "OBJ format does not support alignment"
- " of %d: rounding up to 4096", seg->align);
- seg->align = 4096;
- break;
- default:
- error(ERR_NONFATAL, "invalid alignment value %d",
- seg->align);
- seg->align = 1;
- break;
- }
- } else if (!nasm_strnicmp(p, "absolute=", 9)) {
- seg->align = SEG_ABS + readnum(p+9, &rn_error);
- if (rn_error)
- error (ERR_NONFATAL, "argument to `absolute' segment"
- " attribute should be numeric");
- }
- }
- obj_seg_needs_update = seg;
- if (seg->align >= SEG_ABS)
- deflabel (name, NO_SEG, seg->align - SEG_ABS,
- NULL, FALSE, FALSE, &of_obj, error);
- else
- deflabel (name, seg->index+1, 0L,
- NULL, FALSE, FALSE, &of_obj, error);
- obj_seg_needs_update = NULL;
- /*
- * See if this segment is defined in any groups.
- */
- for (grp = grphead; grp; grp = grp->next) {
- for (i = grp->nindices; i < grp->nentries; i++) {
- if (!strcmp(grp->segs[i].name, seg->name)) {
- nasm_free (grp->segs[i].name);
- grp->segs[i] = grp->segs[grp->nindices];
- grp->segs[grp->nindices++].index = seg->obj_index;
- if (seg->grp)
- error(ERR_WARNING, "segment `%s' is already part of"
- " a group: first one takes precedence",
- seg->name);
- else
- seg->grp = grp;
- }
- }
- }
- /*
- * Walk through the list of externals with unresolved
- * default-WRT clauses, and resolve any that point at this
- * segment.
- */
- extp = &dws;
- while (*extp) {
- if ((*extp)->defwrt_type == DEFWRT_STRING &&
- !strcmp((*extp)->defwrt_ptr.string, seg->name)) {
- nasm_free((*extp)->defwrt_ptr.string);
- (*extp)->defwrt_type = DEFWRT_SEGMENT;
- (*extp)->defwrt_ptr.seg = seg;
- *extp = (*extp)->next_dws;
- } else
- extp = &(*extp)->next_dws;
- }
- if (seg->use32)
- *bits = 32;
- else
- *bits = 16;
- return seg->index;
- }
- }
- static int obj_directive (char *directive, char *value, int pass)
- {
- if (!strcmp(directive, "group")) {
- char *p, *q, *v;
- if (pass == 1) {
- struct Group *grp;
- struct Segment *seg;
- struct External **extp;
- int obj_idx;
- q = value;
- while (*q == '.')
- q++; /* hack, but a documented one */
- v = q;
- while (*q && !isspace(*q))
- q++;
- if (isspace(*q)) {
- *q++ = ' ';
- while (*q && isspace(*q))
- q++;
- }
- /*
- * Here we used to sanity-check the group directive to
- * ensure nobody tried to declare a group containing no
- * segments. However, OS/2 does this as standard
- * practice, so the sanity check has been removed.
- *
- * if (!*q) {
- * error(ERR_NONFATAL,"GROUP directive contains no segments");
- * return 1;
- * }
- */
- obj_idx = 1;
- for (grp = grphead; grp; grp = grp->next) {
- obj_idx++;
- if (!strcmp(grp->name, v)) {
- error(ERR_NONFATAL, "group `%s' defined twice", v);
- return 1;
- }
- }
- *grptail = grp = nasm_malloc(sizeof(*grp));
- grp->next = NULL;
- grptail = &grp->next;
- grp->index = seg_alloc();
- grp->obj_index = obj_idx;
- grp->nindices = grp->nentries = 0;
- grp->name = NULL;
- obj_grp_needs_update = grp;
- deflabel (v, grp->index+1, 0L,
- NULL, FALSE, FALSE, &of_obj, error);
- obj_grp_needs_update = NULL;
- while (*q) {
- p = q;
- while (*q && !isspace(*q))
- q++;
- if (isspace(*q)) {
- *q++ = ' ';
- while (*q && isspace(*q))
- q++;
- }
- /*
- * Now p contains a segment name. Find it.
- */
- for (seg = seghead; seg; seg = seg->next)
- if (!strcmp(seg->name, p))
- break;
- if (seg) {
- /*
- * We have a segment index. Shift a name entry
- * to the end of the array to make room.
- */
- grp->segs[grp->nentries++] = grp->segs[grp->nindices];
- grp->segs[grp->nindices++].index = seg->obj_index;
- if (seg->grp)
- error(ERR_WARNING, "segment `%s' is already part of"
- " a group: first one takes precedence",
- seg->name);
- else
- seg->grp = grp;
- } else {
- /*
- * We have an as-yet undefined segment.
- * Remember its name, for later.
- */
- grp->segs[grp->nentries++].name = nasm_strdup(p);
- }
- }
- /*
- * Walk through the list of externals with unresolved
- * default-WRT clauses, and resolve any that point at
- * this group.
- */
- extp = &dws;
- while (*extp) {
- if ((*extp)->defwrt_type == DEFWRT_STRING &&
- !strcmp((*extp)->defwrt_ptr.string, grp->name)) {
- nasm_free((*extp)->defwrt_ptr.string);
- (*extp)->defwrt_type = DEFWRT_GROUP;
- (*extp)->defwrt_ptr.grp = grp;
- *extp = (*extp)->next_dws;
- } else
- extp = &(*extp)->next_dws;
- }
- }
- return 1;
- }
- if (!strcmp(directive, "uppercase")) {
- obj_uppercase = TRUE;
- return 1;
- }
- if (!strcmp(directive, "import")) {
- char *q, *extname, *libname, *impname;
- if (pass == 2)
- return 1; /* ignore in pass two */
- extname = q = value;
- while (*q && !isspace(*q))
- q++;
- if (isspace(*q)) {
- *q++ = ' ';
- while (*q && isspace(*q))
- q++;
- }
- libname = q;
- while (*q && !isspace(*q))
- q++;
- if (isspace(*q)) {
- *q++ = ' ';
- while (*q && isspace(*q))
- q++;
- }
- impname = q;
- if (!*extname || !*libname)
- error(ERR_NONFATAL, "`import' directive requires symbol name"
- " and library name");
- else {
- struct ImpDef *imp;
- int err = FALSE;
- imp = *imptail = nasm_malloc(sizeof(struct ImpDef));
- imptail = &imp->next;
- imp->next = NULL;
- imp->extname = nasm_strdup(extname);
- imp->libname = nasm_strdup(libname);
- imp->impindex = readnum(impname, &err);
- if (!*impname || err)
- imp->impname = nasm_strdup(impname);
- else
- imp->impname = NULL;
- }
- return 1;
- }
- if (!strcmp(directive, "export")) {
- char *q, *extname, *intname, *v;
- struct ExpDef *export;
- int flags = 0;
- unsigned int ordinal = 0;
- if (pass == 2)
- return 1; /* ignore in pass two */
- intname = q = value;
- while (*q && !isspace(*q))
- q++;
- if (isspace(*q)) {
- *q++ = ' ';
- while (*q && isspace(*q))
- q++;
- }
- extname = q;
- while (*q && !isspace(*q))
- q++;
- if (isspace(*q)) {
- *q++ = ' ';
- while (*q && isspace(*q))
- q++;
- }
- if (!*intname) {
- error(ERR_NONFATAL, "`export' directive requires export name");
- return 1;
- }
- if (!*extname) {
- extname = intname;
- intname = "";
- }
- while (*q) {
- v = q;
- while (*q && !isspace(*q))
- q++;
- if (isspace(*q)) {
- *q++ = ' ';
- while (*q && isspace(*q))
- q++;
- }
- if (!nasm_stricmp(v, "resident"))
- flags |= EXPDEF_FLAG_RESIDENT;
- else if (!nasm_stricmp(v, "nodata"))
- flags |= EXPDEF_FLAG_NODATA;
- else if (!nasm_strnicmp(v, "parm=", 5)) {
- int err = FALSE;
- flags |= EXPDEF_MASK_PARMCNT & readnum(v+5, &err);
- if (err) {
- error(ERR_NONFATAL,
- "value `%s' for `parm' is non-numeric", v+5);
- return 1;
- }
- } else {
- int err = FALSE;
- ordinal = readnum(v, &err);
- if (err) {
- error(ERR_NONFATAL, "unrecognised export qualifier `%s'",
- v);
- return 1;
- }
- flags |= EXPDEF_FLAG_ORDINAL;
- }
- }
- export = *exptail = nasm_malloc(sizeof(struct ExpDef));
- exptail = &export->next;
- export->next = NULL;
- export->extname = nasm_strdup(extname);
- export->intname = nasm_strdup(intname);
- export->ordinal = ordinal;
- export->flags = flags;
- return 1;
- }
- return 0;
- }
- static long obj_segbase (long segment)
- {
- struct Segment *seg;
- /*
- * Find the segment in our list.
- */
- for (seg = seghead; seg; seg = seg->next)
- if (seg->index == segment-1)
- break;
- if (!seg) {
- /*
- * Might be an external with a default WRT.
- */
- long i = segment/2;
- struct ExtBack *eb = ebhead;
- struct External *e;
- while (i > EXT_BLKSIZ) {
- if (eb)
- eb = eb->next;
- else
- break;
- i -= EXT_BLKSIZ;
- }
- if (eb) {
- e = eb->exts[i];
- if (e->defwrt_type == DEFWRT_NONE)
- return segment; /* fine */
- else if (e->defwrt_type == DEFWRT_SEGMENT)
- return e->defwrt_ptr.seg->index+1;
- else if (e->defwrt_type == DEFWRT_GROUP)
- return e->defwrt_ptr.grp->index+1;
- else
- return NO_SEG; /* can't tell what it is */
- }
- return segment; /* not one of ours - leave it alone */
- }
- if (seg->align >= SEG_ABS)
- return seg->align; /* absolute segment */
- if (seg->grp)
- return seg->grp->index+1; /* grouped segment */
- return segment; /* no special treatment */
- }
- static void obj_filename (char *inname, char *outname, efunc error)
- {
- strcpy(obj_infile, inname);
- standard_extension (inname, outname, ".obj", error);
- }
- static void obj_write_file (int debuginfo)
- {
- struct Segment *seg, *entry_seg_ptr = 0;
- struct FileName *fn;
- struct LineNumber *ln;
- struct Group *grp;
- struct Public *pub, *loc;
- struct External *ext;
- struct ImpDef *imp;
- struct ExpDef *export;
- static char boast[] = "The Netwide Assembler " NASM_VER;
- int lname_idx;
- ObjRecord *orp;
- /*
- * Write the THEADR module header.
- */
- orp = obj_new();
- orp->type = THEADR;
- obj_name (orp, obj_infile);
- obj_emit2 (orp);
- /*
- * Write the NASM boast comment.
- */
- orp->type = COMENT;
- obj_rword (orp, 0); /* comment type zero */
- obj_name (orp, boast);
- obj_emit2 (orp);
- orp->type = COMENT;
- /*
- * Write the IMPDEF records, if any.
- */
- for (imp = imphead; imp; imp = imp->next) {
- obj_rword (orp, 0xA0); /* comment class A0 */
- obj_byte (orp, 1); /* subfunction 1: IMPDEF */
- if (imp->impname)
- obj_byte (orp, 0); /* import by name */
- else
- obj_byte (orp, 1); /* import by ordinal */
- obj_name (orp, imp->extname);
- obj_name (orp, imp->libname);
- if (imp->impname)
- obj_name (orp, imp->impname);
- else
- obj_word (orp, imp->impindex);
- obj_emit2 (orp);
- }
- /*
- * Write the EXPDEF records, if any.
- */
- for (export = exphead; export; export = export->next) {
- obj_rword (orp, 0xA0); /* comment class A0 */
- obj_byte (orp, 2); /* subfunction 2: EXPDEF */
- obj_byte (orp, export->flags);
- obj_name (orp, export->extname);
- obj_name (orp, export->intname);
- if (export->flags & EXPDEF_FLAG_ORDINAL)
- obj_word (orp, export->ordinal);
- obj_emit2 (orp);
- }
- /* we're using extended OMF if we put in debug info*/
- if (debuginfo) {
- orp->type = COMENT;
- obj_byte (orp, 0x40);
- obj_byte (orp, dEXTENDED);
- obj_emit2 (orp);
- }
- /*
- * Write the first LNAMES record, containing LNAME one, which
- * is null. Also initialise the LNAME counter.
- */
- orp->type = LNAMES;
- obj_byte (orp, 0);
- lname_idx = 1;
- /*
- * Write some LNAMES for the segment names
- */
- for (seg = seghead; seg; seg = seg->next) {
- orp = obj_name (orp, seg->name);
- if (seg->segclass)
- orp = obj_name (orp, seg->segclass);
- if (seg->overlay)
- orp = obj_name (orp, seg->overlay);
- obj_commit (orp);
- }
- /*
- * Write some LNAMES for the group names
- */
- for (grp = grphead; grp; grp = grp->next) {
- orp = obj_name (orp, grp->name);
- obj_commit (orp);
- }
- obj_emit (orp);
- /*
- * Write the SEGDEF records.
- */
- orp->type = SEGDEF;
- for (seg = seghead; seg; seg = seg->next) {
- int acbp;
- unsigned long seglen = seg->currentpos;
- acbp = (seg->combine << 2); /* C field */
- if (seg->use32)
- acbp |= 0x01; /* P bit is Use32 flag */
- else if (seglen == 0x10000L) {
- seglen = 0; /* This special case may be needed for old linkers */
- acbp |= 0x02; /* B bit */
- }
- /* A field */
- if (seg->align >= SEG_ABS)
- /* acbp |= 0x00 */;
- else if (seg->align >= 4096) {
- if (seg->align > 4096)
- error(ERR_NONFATAL, "segment `%s' requires more alignment"
- " than OBJ format supports", seg->name);
- acbp |= 0xC0; /* PharLap extension */
- } else if (seg->align >= 256) {
- acbp |= 0x80;
- } else if (seg->align >= 16) {
- acbp |= 0x60;
- } else if (seg->align >= 4) {
- acbp |= 0xA0;
- } else if (seg->align >= 2) {
- acbp |= 0x40;
- } else
- acbp |= 0x20;
- obj_byte (orp, acbp);
- if (seg->align & SEG_ABS) {
- obj_x (orp, seg->align - SEG_ABS); /* Frame */
- obj_byte (orp, 0); /* Offset */
- }
- obj_x (orp, seglen);
- obj_index (orp, ++lname_idx);
- obj_index (orp, seg->segclass ? ++lname_idx : 1);
- obj_index (orp, seg->overlay ? ++lname_idx : 1);
- obj_emit2 (orp);
- }
- /*
- * Write the GRPDEF records.
- */
- orp->type = GRPDEF;
- for (grp = grphead; grp; grp = grp->next) {
- int i;
- if (grp->nindices != grp->nentries) {
- for (i = grp->nindices; i < grp->nentries; i++) {
- error(ERR_NONFATAL, "group `%s' contains undefined segment"
- " `%s'", grp->name, grp->segs[i].name);
- nasm_free (grp->segs[i].name);
- grp->segs[i].name = NULL;
- }
- }
- obj_index (orp, ++lname_idx);
- for (i = 0; i < grp->nindices; i++) {
- obj_byte (orp, 0xFF);
- obj_index (orp, grp->segs[i].index);
- }
- obj_emit2 (orp);
- }
- /*
- * Write the PUBDEF records: first the ones in the segments,
- * then the far-absolutes.
- */
- orp->type = PUBDEF;
- orp->ori = ori_pubdef;
- for (seg = seghead; seg; seg = seg->next) {
- orp->parm[0] = seg->grp ? seg->grp->obj_index : 0;
- orp->parm[1] = seg->obj_index;
- for (pub = seg->pubhead; pub; pub = pub->next) {
- orp = obj_name (orp, pub->name);
- orp = obj_x (orp, pub->offset);
- orp = obj_byte (orp, 0); /* type index */
- obj_commit (orp);
- }
- obj_emit (orp);
- }
- orp->parm[0] = 0;
- orp->parm[1] = 0;
- for (pub = fpubhead; pub; pub = pub->next) { /* pub-crawl :-) */
- if (orp->parm[2] != pub->segment) {
- obj_emit (orp);
- orp->parm[2] = pub->segment;
- }
- orp = obj_name (orp, pub->name);
- orp = obj_x (orp, pub->offset);
- orp = obj_byte (orp, 0); /* type index */
- obj_commit (orp);
- }
- obj_emit (orp);
- /*
- * Write the EXTDEF and COMDEF records, in order.
- */
- orp->ori = ori_null;
- for (ext = exthead; ext; ext = ext->next) {
- if (ext->commonsize == 0) {
- if (orp->type != EXTDEF) {
- obj_emit (orp);
- orp->type = EXTDEF;
- }
- orp = obj_name (orp, ext->name);
- orp = obj_index (orp, 0);
- } else {
- if (orp->type != COMDEF) {
- obj_emit (orp);
- orp->type = COMDEF;
- }
- orp = obj_name (orp, ext->name);
- orp = obj_index (orp, 0);
- if (ext->commonelem) {
- orp = obj_byte (orp, 0x61);/* far communal */
- orp = obj_value (orp, (ext->commonsize / ext->commonelem));
- orp = obj_value (orp, ext->commonelem);
- } else {
- orp = obj_byte (orp, 0x62);/* near communal */
- orp = obj_value (orp, ext->commonsize);
- }
- }
- obj_commit (orp);
- }
- obj_emit (orp);
- /*
- * Write a COMENT record stating that the linker's first pass
- * may stop processing at this point. Exception is if our
- * MODEND record specifies a start point, in which case,
- * according to some variants of the documentation, this COMENT
- * should be omitted. So we'll omit it just in case.
- * But, TASM puts it in all the time so if we are using
- * TASM debug stuff we are putting it in
- */
- if (debuginfo || obj_entry_seg == NO_SEG) {
- orp->type = COMENT;
- obj_byte (orp, 0x40);
- obj_byte (orp, dLINKPASS);
- obj_byte (orp, 1);
- obj_emit2 (orp);
- }
- /*
- * 1) put out the compiler type
- * 2) Put out the type info. The only type we are using is near label #19
- */
- if (debuginfo) {
- int i;
- struct Array *arrtmp = arrhead;
- orp->type = COMENT;
- obj_byte (orp, 0x40);
- obj_byte (orp, dCOMPDEF);
- obj_byte (orp, 4);
- obj_byte (orp, 0);
- obj_emit2 (orp);
- obj_byte (orp, 0x40);
- obj_byte (orp, dTYPEDEF);
- obj_word (orp, 0x18); /* type # for linking */
- obj_word (orp, 6); /* size of type */
- obj_byte (orp, 0x2a); /* absolute type for debugging */
- obj_emit2 (orp);
- obj_byte (orp, 0x40);
- obj_byte (orp, dTYPEDEF);
- obj_word (orp, 0x19); /* type # for linking */
- obj_word (orp, 0); /* size of type */
- obj_byte (orp, 0x24); /* absolute type for debugging */
- obj_byte (orp, 0); /* near/far specifier */
- obj_emit2 (orp);
- obj_byte (orp, 0x40);
- obj_byte (orp, dTYPEDEF);
- obj_word (orp, 0x1A); /* type # for linking */
- obj_word (orp, 0); /* size of type */
- obj_byte (orp, 0x24); /* absolute type for debugging */
- obj_byte (orp, 1); /* near/far specifier */
- obj_emit2 (orp);
- obj_byte (orp, 0x40);
- obj_byte (orp, dTYPEDEF);
- obj_word (orp, 0x1b); /* type # for linking */
- obj_word (orp, 0); /* size of type */
- obj_byte (orp, 0x23); /* absolute type for debugging */
- obj_byte (orp, 0);
- obj_byte (orp, 0);
- obj_byte (orp, 0);
- obj_emit2 (orp);
- obj_byte (orp, 0x40);
- obj_byte (orp, dTYPEDEF);
- obj_word (orp, 0x1c); /* type # for linking */
- obj_word (orp, 0); /* size of type */
- obj_byte (orp, 0x23); /* absolute type for debugging */
- obj_byte (orp, 0);
- obj_byte (orp, 4);
- obj_byte (orp, 0);
- obj_emit2 (orp);
- obj_byte (orp, 0x40);
- obj_byte (orp, dTYPEDEF);
- obj_word (orp, 0x1d); /* type # for linking */
- obj_word (orp, 0); /* size of type */
- obj_byte (orp, 0x23); /* absolute type for debugging */
- obj_byte (orp, 0);
- obj_byte (orp, 1);
- obj_byte (orp, 0);
- obj_emit2 (orp);
- obj_byte (orp, 0x40);
- obj_byte (orp, dTYPEDEF);
- obj_word (orp, 0x1e); /* type # for linking */
- obj_word (orp, 0); /* size of type */
- obj_byte (orp, 0x23); /* absolute type for debugging */
- obj_byte (orp, 0);
- obj_byte (orp, 5);
- obj_byte (orp, 0);
- obj_emit2 (orp);
- /* put out the array types */
- for (i= ARRAYBOT; i < arrindex; i++) {
- obj_byte (orp, 0x40);
- obj_byte (orp, dTYPEDEF);
- obj_word (orp, i ); /* type # for linking */
- obj_word (orp, arrtmp->size); /* size of type */
- obj_byte (orp, 0x1A); /* absolute type for debugging (array)*/
- obj_byte (orp, arrtmp->basetype ); /* base type */
- obj_emit2 (orp);
- arrtmp = arrtmp->next ;
- }
- }
- /*
- * write out line number info with a LINNUM record
- * switch records when we switch segments, and output the
- * file in a pseudo-TASM fashion. The record switch is naive; that
- * is that one file may have many records for the same segment
- * if there are lots of segment switches
- */
- if (fnhead && debuginfo) {
- seg = fnhead->lnhead->segment;
- for (fn = fnhead; fn; fn = fn->next) {
- /* write out current file name */
- orp->type = COMENT;
- orp->ori = ori_null;
- obj_byte (orp, 0x40);
- obj_byte (orp, dFILNAME);
- obj_byte( orp,0);
- obj_name( orp,fn->name);
- obj_dword(orp, 0);
- obj_emit2 (orp);
- /* write out line numbers this file */
- orp->type = LINNUM;
- orp->ori = ori_linnum;
- for (ln = fn->lnhead; ln; ln = ln->next) {
- if (seg != ln->segment) {
- /* if we get here have to flush the buffer and start
- * a new record for a new segment
- */
- seg = ln->segment;
- obj_emit ( orp );
- }
- orp->parm[0] = seg->grp ? seg->grp->obj_index : 0;
- orp->parm[1] = seg->obj_index;
- orp = obj_word(orp, ln->lineno);
- orp = obj_x(orp, ln->offset);
- obj_commit (orp);
- }
- obj_emit (orp);
- }
- }
- /*
- * we are going to locate the entry point segment now
- * rather than wait until the MODEND record, because,
- * then we can output a special symbol to tell where the
- * entry point is.
- *
- */
- if (obj_entry_seg != NO_SEG) {
- for (seg = seghead; seg; seg = seg->next) {
- if (seg->index == obj_entry_seg) {
- entry_seg_ptr = seg;
- break;
- }
- }
- if (!seg)
- error(ERR_NONFATAL, "entry point is not in this module");
- }
- /*
- * get ready to put out symbol records
- */
- orp->type = COMENT;
- orp->ori = ori_local;
- /*
- * put out a symbol for the entry point
- * no dots in this symbol, because, borland does
- * not (officially) support dots in label names
- * and I don't know what various versions of TLINK will do
- */
- if (debuginfo && obj_entry_seg != NO_SEG) {
- orp = obj_name (orp,"start_of_program");
- orp = obj_word (orp,0x19); /* type: near label */
- orp = obj_index (orp, seg->grp ? seg->grp->obj_index : 0);
- orp = obj_index (orp, seg->obj_index);
- orp = obj_x (orp, obj_entry_ofs);
- obj_commit (orp);
- }
- /*
- * put out the local labels
- */
- for (seg = seghead; seg && debuginfo; seg = seg->next) {
- /* labels this seg */
- for (loc = seg->lochead; loc; loc = loc->next) {
- orp = obj_name (orp,loc->name);
- orp = obj_word (orp, loc->type);
- orp = obj_index (orp, seg->grp ? seg->grp->obj_index : 0);
- orp = obj_index (orp, seg->obj_index);
- orp = obj_x (orp,loc->offset);
- obj_commit (orp);
- }
- }
- if (orp->used)
- obj_emit (orp);
- /*
- * Write the LEDATA/FIXUPP pairs.
- */
- for (seg = seghead; seg; seg = seg->next) {
- obj_emit (seg->orp);
- nasm_free (seg->orp);
- }
- /*
- * Write the MODEND module end marker.
- */
- orp->type = MODEND;
- orp->ori = ori_null;
- if (entry_seg_ptr) {
- obj_byte (orp, 0xC1);
- seg = entry_seg_ptr;
- if (seg->grp) {
- obj_byte (orp, 0x10);
- obj_index (orp, seg->grp->obj_index);
- } else {
- /*
- * the below changed to prevent TLINK crashing.
- * Previous more efficient version read:
- *
- * obj_byte (orp, 0x50);
- */
- obj_byte (orp, 0x00);
- obj_index (orp, seg->obj_index);
- }
- obj_index (orp, seg->obj_index);
- obj_x (orp, obj_entry_ofs);
- } else
- obj_byte (orp, 0);
- obj_emit2 (orp);
- nasm_free (orp);
- }
- void obj_fwrite(ObjRecord *orp)
- {
- unsigned int cksum, len;
- unsigned char *ptr;
- cksum = orp->type;
- if (orp->x_size == 32)
- cksum |= 1;
- fputc (cksum, ofp);
- len = orp->committed+1;
- cksum += (len & 0xFF) + ((len>>8) & 0xFF);
- fwriteshort (len, ofp);
- fwrite (orp->buf, 1, len-1, ofp);
- for (ptr=orp->buf; --len; ptr++)
- cksum += *ptr;
- fputc ( (-cksum) & 0xFF, ofp);
- }
- static char *obj_stdmac[] = {
- "%define __SECT__ [section .text]",
- "%imacro group 1+.nolist",
- "[group %1]",
- "%endmacro",
- "%imacro uppercase 0+.nolist",
- "[uppercase %1]",
- "%endmacro",
- "%imacro export 1+.nolist",
- "[export %1]",
- "%endmacro",
- "%imacro import 1+.nolist",
- "[import %1]",
- "%endmacro",
- "%macro __NASM_CDecl__ 1",
- "%endmacro",
- NULL
- };
- void dbgbi_init(struct ofmt * of, void * id, FILE * fp, efunc error)
- {
- (void) of;
- (void) id;
- (void) fp;
- (void) error;
- fnhead = NULL;
- fntail = &fnhead;
- arrindex = ARRAYBOT ;
- arrhead = NULL;
- arrtail = &arrhead;
- }
- static void dbgbi_cleanup(void)
- {
- struct Segment *segtmp;
- while (fnhead) {
- struct FileName *fntemp = fnhead;
- while (fnhead->lnhead) {
- struct LineNumber *lntemp = fnhead->lnhead;
- fnhead->lnhead = lntemp->next;
- nasm_free( lntemp);
- }
- fnhead = fnhead->next;
- nasm_free (fntemp->name);
- nasm_free (fntemp);
- }
- for (segtmp=seghead; segtmp; segtmp=segtmp->next) {
- while (segtmp->lochead) {
- struct Public *loctmp = segtmp->lochead;
- segtmp->lochead = loctmp->next;
- nasm_free (loctmp->name);
- nasm_free (loctmp);
- }
- }
- while (arrhead) {
- struct Array *arrtmp = arrhead;
- arrhead = arrhead->next;
- nasm_free (arrtmp);
- }
- }
- static void dbgbi_linnum (const char *lnfname, long lineno, long segto)
- {
- struct FileName *fn;
- struct LineNumber *ln;
- struct Segment *seg;
- if (segto == NO_SEG)
- return;
- /*
- * If `any_segs' is still FALSE, we must define a default
- * segment.
- */
- if (!any_segs) {
- int tempint; /* ignored */
- if (segto != obj_segment("__NASMDEFSEG", 2, &tempint))
- error (ERR_PANIC, "strange segment conditions in OBJ driver");
- }
- /*
- * Find the segment we are targetting.
- */
- for (seg = seghead; seg; seg = seg->next)
- if (seg->index == segto)
- break;
- if (!seg)
- error (ERR_PANIC, "lineno directed to nonexistent segment?");
- for (fn = fnhead; fn; fn = fnhead->next)
- if (!nasm_stricmp(lnfname,fn->name))
- break;
- if (!fn) {
- fn = nasm_malloc ( sizeof( *fn));
- fn->name = nasm_malloc ( strlen(lnfname) + 1) ;
- strcpy (fn->name,lnfname);
- fn->lnhead = NULL;
- fn->lntail = & fn->lnhead;
- fn->next = NULL;
- *fntail = fn;
- fntail = &fn->next;
- }
- ln = nasm_malloc ( sizeof( *ln));
- ln->segment = seg;
- ln->offset = seg->currentpos;
- ln->lineno = lineno;
- ln->next = NULL;
- *fn->lntail = ln;
- fn->lntail = &ln->next;
- }
- static void dbgbi_deflabel (char *name, long segment,
- long offset, int is_global, char *special)
- {
- struct Segment *seg;
- (void) special;
- /*
- * If it's a special-retry from pass two, discard it.
- */
- if (is_global == 3)
- return;
- /*
- * First check for the double-period, signifying something
- * unusual.
- */
- if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
- return;
- }
- /*
- * Case (i):
- */
- if (obj_seg_needs_update) {
- return;
- } else if (obj_grp_needs_update) {
- return;
- }
- if (segment < SEG_ABS && segment != NO_SEG && segment % 2)
- return;
- if (segment >= SEG_ABS || segment == NO_SEG) {
- return;
- }
- /*
- * If `any_segs' is still FALSE, we might need to define a
- * default segment, if they're trying to declare a label in
- * `first_seg'. But the label should exist due to a prior
- * call to obj_deflabel so we can skip that.
- */
- for (seg = seghead; seg; seg = seg->next)
- if (seg->index == segment) {
- struct Public *loc = nasm_malloc (sizeof(*loc));
- /*
- * Case (ii). Maybe MODPUB someday?
- */
- last_defined = *seg->loctail = loc;
- seg->loctail = &loc->next;
- loc->next = NULL;
- loc->name = nasm_strdup(name);
- loc->offset = offset;
- }
- }
- static void dbgbi_typevalue (long type)
- {
- int vsize;
- int elem = TYM_ELEMENTS(type);
- type = TYM_TYPE(type);
- if (!last_defined)
- return;
- switch (type) {
- case TY_BYTE:
- last_defined->type = 8; /* unsigned char */
- vsize = 1;
- break;
- case TY_WORD:
- last_defined->type = 10; /* unsigned word */
- vsize = 2;
- break;
- case TY_DWORD:
- last_defined->type = 12; /* unsigned dword */
- vsize = 4;
- break;
- case TY_FLOAT:
- last_defined->type = 14; /* float */
- vsize = 4;
- break;
- case TY_QWORD:
- last_defined->type = 15; /* qword */
- vsize = 8;
- break;
- case TY_TBYTE:
- last_defined->type = 16; /* TBYTE */
- vsize = 10;
- break;
- default:
- last_defined->type = 0x19; /*label */
- vsize = 0;
- break;
- }
- if (elem > 1) {
- struct Array *arrtmp = nasm_malloc (sizeof(*arrtmp));
- int vtype = last_defined->type;
- arrtmp->size = vsize * elem;
- arrtmp->basetype = vtype;
- arrtmp->next = NULL;
- last_defined->type = arrindex++;
- *arrtail = arrtmp;
- arrtail = & (arrtmp->next);
- }
- last_defined = NULL;
- }
- static void dbgbi_output (int output_type, void *param)
- {
- (void) output_type;
- (void) param;
- }
- static struct dfmt borland_debug_form = {
- "Borland Debug Records",
- "borland",
- dbgbi_init,
- dbgbi_linnum,
- dbgbi_deflabel,
- null_debug_routine,
- dbgbi_typevalue,
- dbgbi_output,
- dbgbi_cleanup,
- };
- static struct dfmt *borland_debug_arr[3] = {
- &borland_debug_form,
- &null_debug_form,
- NULL
- };
- struct ofmt of_obj = {
- "MS-DOS 16-bit/32-bit OMF object files",
- "obj",
- NULL,
- borland_debug_arr,
- &null_debug_form,
- obj_stdmac,
- obj_init,
- obj_set_info,
- obj_out,
- obj_deflabel,
- obj_segment,
- obj_segbase,
- obj_directive,
- obj_filename,
- obj_cleanup
- };
- #endif /* OF_OBJ */