mirror/nasm
2
0
Fork 0
mirror of https://github.com/netwide-assembler/nasm.git synced 2024-11-21 03:14:19 +08:00
Code Issues Packages Projects Releases Wiki Activity
d1a9f8a2f7
nasm/output/outrdf2.c
H. Peter Anvin 8960e1bc83 Remove #includes already provided by "compiler.h" 
"compiler.h" already includes a bunch of common include files. There
is absolutely no reason to duplicate them in individual files, and in
fact it robs us of central control of how these files are used.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2018-12-27 12:45:44 -08:00

767 lines
22 KiB
C
Raw Blame History

/* ----------------------------------------------------------------------- *
*
* Copyright 1996-2016 The NASM Authors - All Rights Reserved
* See the file AUTHORS included with the NASM distribution for
* the specific copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ----------------------------------------------------------------------- */
/*
* outrdf2.c output routines for the Netwide Assembler to produce
* RDOFF version 2 format object files, which Julian originally
* planned to use it in his MOSCOW operating system.
*/
#include "compiler.h"
#include "nctype.h"
#include "nasm.h"
#include "nasmlib.h"
#include "error.h"
#include "saa.h"
#include "outform.h"
#include "outlib.h"
/* VERBOSE_WARNINGS: define this to add some extra warnings... */
#define VERBOSE_WARNINGS
#ifdef OF_RDF2
#include "rdoff.h"
/* This signature is written to start of RDOFF files */
static const char *RDOFF2Id = RDOFF2_SIGNATURE;
/* Note that whenever a segment is referred to in the RDOFF file, its number
* is always half of the segment number that NASM uses to refer to it; this
* is because NASM only allocates even numbered segments, so as to not
* waste any of the 16 bits of segment number written to the file - this
* allows up to 65533 external labels to be defined; otherwise it would be
* 32764. */
#define COUNT_SEGTYPES 9
static char *segmenttypes[COUNT_SEGTYPES] = {
"null", "text", "code", "data",
"comment", "lcomment", "pcomment",
"symdebug", "linedebug"
};
static int segmenttypenumbers[COUNT_SEGTYPES] = {
0, 1, 1, 2, 3, 4, 5, 6, 7
};
/* code for managing buffers needed to separate code and data into individual
* sections until they are ready to be written to the file.
* We'd better hope that it all fits in memory else we're buggered... */
#define BUF_BLOCK_LEN 4088 /* selected to match page size (4096)
* on 80x86 machines for efficiency */
/***********************************************************************
* Actual code to deal with RDOFF2 ouput format begins here...
*/
/* global variables set during the initialisation phase */
static struct SAA *seg[RDF_MAXSEGS]; /* seg 0 = code, seg 1 = data */
static struct SAA *header; /* relocation/import/export records */
static struct seginfo {
char *segname;
int segnumber;
uint16_t segtype;
uint16_t segreserved;
int32_t seglength;
} segments[RDF_MAXSEGS];
static int nsegments;
static int32_t bsslength;
static int32_t headerlength;
static void rdf2_init(void)
{
int segtext, segdata, segbss;
/* set up the initial segments */
segments[0].segname = ".text";
segments[0].segnumber = 0;
segments[0].segtype = 1;
segments[0].segreserved = 0;
segments[0].seglength = 0;
segments[1].segname = ".data";
segments[1].segnumber = 1;
segments[1].segtype = 2;
segments[1].segreserved = 0;
segments[1].seglength = 0;
segments[2].segname = ".bss";
segments[2].segnumber = 2;
segments[2].segtype = 0xFFFF; /* reserved - should never be produced */
segments[2].segreserved = 0;
segments[2].seglength = 0;
nsegments = 3;
seg[0] = saa_init(1L);
seg[1] = saa_init(1L);
seg[2] = NULL; /* special case! */
header = saa_init(1L);
segtext = seg_alloc();
segdata = seg_alloc();
segbss = seg_alloc();
if (segtext != 0 || segdata != 2 || segbss != 4)
nasm_panic("rdf segment numbers not allocated as expected (%d,%d,%d)",
segtext, segdata, segbss);
bsslength = 0;
headerlength = 0;
}
static int32_t rdf2_section_names(char *name, int *bits)
{
int i;
bool err;
char *p, *q;
int code = -1;
int reserved = 0;
/*
* Default is 32 bits, in the text segment.
*/
if (!name) {
*bits = 32;
return 0;
}
/* look for segment type code following segment name */
p = name;
while (*p && !nasm_isspace(*p))
p++;
if (*p) { /* we're now in whitespace */
*p++ = '\0';
while (*p && nasm_isspace(80))
*p++ = '\0';
}
if (*p) { /* we're now in an attribute value */
/*
* see if we have an optional ',number' following the type code
*/
if ((q = strchr(p, ','))) {
*q++ = '\0';
reserved = readnum(q, &err);
if (err) {
nasm_error(ERR_NONFATAL,
"value following comma must be numeric");
reserved = 0;
}
}
/*
* check it against the text strings in segmenttypes
*/
for (i = 0; i < COUNT_SEGTYPES; i++)
if (!nasm_stricmp(p, segmenttypes[i])) {
code = segmenttypenumbers[i];
break;
}
if (code == -1) { /* didn't find anything */
code = readnum(p, &err);
if (err) {
nasm_error(ERR_NONFATAL, "unrecognised RDF segment type (%s)",
p);
code = 3;
}
}
}
for (i = 0; i < nsegments; i++) {
if (!strcmp(name, segments[i].segname)) {
if (code != -1 || reserved != 0)
nasm_error(ERR_NONFATAL, "segment attributes specified on"
" redeclaration of segment");
return segments[i].segnumber * 2;
}
}
/* declaring a new segment! */
if (code == -1) {
nasm_error(ERR_NONFATAL, "new segment declared without type code");
code = 3;
}
if (nsegments == RDF_MAXSEGS) {
nasm_fatal("reached compiled-in maximum segment limit (%d)",
RDF_MAXSEGS);
return NO_SEG;
}
segments[nsegments].segname = nasm_strdup(name);
i = seg_alloc();
if (i % 2 != 0)
nasm_panic("seg_alloc() returned odd number");
segments[nsegments].segnumber = i >> 1;
segments[nsegments].segtype = code;
segments[nsegments].segreserved = reserved;
segments[nsegments].seglength = 0;
seg[nsegments] = saa_init(1L);
return i;
}
/*
* Write relocation record
*/
static void write_reloc_rec(struct RelocRec *r)
{
char buf[4], *b;
if (r->refseg != (uint16_t) NO_SEG && (r->refseg & 1)) /* segment base ref */
r->type = RDFREC_SEGRELOC;
r->refseg >>= 1; /* adjust segment nos to RDF rather than NASM */
saa_wbytes(header, &r->type, 1);
saa_wbytes(header, &r->reclen, 1);
saa_wbytes(header, &r->segment, 1);
b = buf;
WRITELONG(b, r->offset);
saa_wbytes(header, buf, 4);
saa_wbytes(header, &r->length, 1);
b = buf;
WRITESHORT(b, r->refseg);
saa_wbytes(header, buf, 2);
headerlength += r->reclen + 2;
}
/*
* Write export record
*/
static void write_export_rec(struct ExportRec *r)
{
char buf[4], *b;
r->segment >>= 1;
saa_wbytes(header, &r->type, 1);
saa_wbytes(header, &r->reclen, 1);
saa_wbytes(header, &r->flags, 1);
saa_wbytes(header, &r->segment, 1);
b = buf;
WRITELONG(b, r->offset);
saa_wbytes(header, buf, 4);
saa_wbytes(header, r->label, strlen(r->label) + 1);
headerlength += r->reclen + 2;
}
static void write_import_rec(struct ImportRec *r)
{
char buf[4], *b;
r->segment >>= 1;
saa_wbytes(header, &r->type, 1);
saa_wbytes(header, &r->reclen, 1);
saa_wbytes(header, &r->flags, 1);
b = buf;
WRITESHORT(b, r->segment);
saa_wbytes(header, buf, 2);
saa_wbytes(header, r->label, strlen(r->label) + 1);
headerlength += r->reclen + 2;
}
/*
* Write BSS record
*/
static void write_bss_rec(struct BSSRec *r)
{
char buf[4], *b;
saa_wbytes(header, &r->type, 1);
saa_wbytes(header, &r->reclen, 1);
b = buf;
WRITELONG(b, r->amount);
saa_wbytes(header, buf, 4);
headerlength += r->reclen + 2;
}
/*
* Write common variable record
*/
static void write_common_rec(struct CommonRec *r)
{
char buf[4], *b;
r->segment >>= 1;
saa_wbytes(header, &r->type, 1);
saa_wbytes(header, &r->reclen, 1);
b = buf;
WRITESHORT(b, r->segment);
saa_wbytes(header, buf, 2);
b = buf;
WRITELONG(b, r->size);
saa_wbytes(header, buf, 4);
b = buf;
WRITESHORT(b, r->align);
saa_wbytes(header, buf, 2);
saa_wbytes(header, r->label, strlen(r->label) + 1);
headerlength += r->reclen + 2;
}
/*
* Write library record
*/
static void write_dll_rec(struct DLLRec *r)
{
saa_wbytes(header, &r->type, 1);
saa_wbytes(header, &r->reclen, 1);
saa_wbytes(header, r->libname, strlen(r->libname) + 1);
headerlength += r->reclen + 2;
}
/*
* Write module name record
*/
static void write_modname_rec(struct ModRec *r)
{
saa_wbytes(header, &r->type, 1);
saa_wbytes(header, &r->reclen, 1);
saa_wbytes(header, r->modname, strlen(r->modname) + 1);
headerlength += r->reclen + 2;
}
/*
* Handle export, import and common records.
*/
static void rdf2_deflabel(char *name, int32_t segment, int64_t offset,
int is_global, char *special)
{
struct ExportRec r;
struct ImportRec ri;
struct CommonRec ci;
static int farsym = 0;
static int i;
char symflags = 0;
int len;
/* Check if the label length is OK */
if ((len = strlen(name)) >= EXIM_LABEL_MAX) {
nasm_error(ERR_NONFATAL, "label size exceeds %d bytes", EXIM_LABEL_MAX);
return;
}
if (!len) {
nasm_error(ERR_NONFATAL, "zero-length label");
return;
}
if (is_global == 2) {
/* Common variable */
ci.type = RDFREC_COMMON;
ci.size = offset;
ci.segment = segment;
strcpy(ci.label, name);
ci.reclen = 9 + len;
ci.align = 0;
/*
* Check the special text to see if it's a valid number and power
* of two; if so, store it as the alignment for the common variable.
*/
if (special) {
bool err;
ci.align = readnum(special, &err);
if (err)
nasm_error(ERR_NONFATAL, "alignment constraint `%s' is not a"
" valid number", special);
else if ((ci.align | (ci.align - 1)) != 2 * ci.align - 1)
nasm_error(ERR_NONFATAL, "alignment constraint `%s' is not a"
" power of two", special);
}
write_common_rec(&ci);
}
/* We don't care about local labels or fix-up hints */
if (is_global != 1)
return;
if (special) {
while (*special == ' ' || *special == '\t')
special++;
if (!nasm_strnicmp(special, "export", 6)) {
special += 6;
symflags |= SYM_GLOBAL;
} else if (!nasm_strnicmp(special, "import", 6)) {
special += 6;
symflags |= SYM_IMPORT;
}
if (*special) {
while (nasm_isspace(*special))
special++;
if (!nasm_stricmp(special, "far")) {
farsym = 1;
} else if (!nasm_stricmp(special, "near")) {
farsym = 0;
} else if (!nasm_stricmp(special, "proc") ||
!nasm_stricmp(special, "function")) {
symflags |= SYM_FUNCTION;
} else if (!nasm_stricmp(special, "data") ||
!nasm_stricmp(special, "object")) {
symflags |= SYM_DATA;
} else
nasm_error(ERR_NONFATAL, "unrecognised symbol type `%s'",
special);
}
}
if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
nasm_error(ERR_NONFATAL, "unrecognised special symbol `%s'", name);
return;
}
for (i = 0; i < nsegments; i++) {
if (segments[i].segnumber == segment >> 1)
break;
}
if (i >= nsegments) { /* EXTERN declaration */
ri.type = farsym ? RDFREC_FARIMPORT : RDFREC_IMPORT;
if (symflags & SYM_GLOBAL)
nasm_error(ERR_NONFATAL,
"symbol type conflict - EXTERN cannot be EXPORT");
ri.flags = symflags;
ri.segment = segment;
strcpy(ri.label, name);
ri.reclen = 4 + len;
write_import_rec(&ri);
} else if (is_global) {
r.type = RDFREC_GLOBAL; /* GLOBAL declaration */
if (symflags & SYM_IMPORT)
nasm_error(ERR_NONFATAL,
"symbol type conflict - GLOBAL cannot be IMPORT");
r.flags = symflags;
r.segment = segment;
r.offset = offset;
strcpy(r.label, name);
r.reclen = 7 + len;
write_export_rec(&r);
}
}
static void membufwrite(int segment, const void *data, int bytes)
{
int i;
char buf[4], *b;
for (i = 0; i < nsegments; i++) {
if (segments[i].segnumber == segment)
break;
}
if (i == nsegments)
nasm_panic("can't find segment %d", segment);
if (bytes < 0) {
b = buf;
if (bytes == -2)
WRITESHORT(b, *(int16_t *)data);
else
WRITELONG(b, *(int32_t *)data);
data = buf;
bytes = -bytes;
}
segments[i].seglength += bytes;
saa_wbytes(seg[i], data, bytes);
}
static int getsegmentlength(int segment)
{
int i;
for (i = 0; i < nsegments; i++) {
if (segments[i].segnumber == segment)
break;
}
if (i == nsegments)
nasm_panic("can't find segment %d", segment);
return segments[i].seglength;
}
static void rdf2_out(int32_t segto, const void *data,
enum out_type type, uint64_t size,
int32_t segment, int32_t wrt)
{
struct RelocRec rr;
uint8_t databuf[8], *pd;
int seg;
segto >>= 1; /* convert NASM segment no to RDF number */
for (seg = 0; seg < nsegments; seg++) {
if (segments[seg].segnumber == segto)
break;
}
if (seg >= nsegments) {
nasm_error(ERR_NONFATAL,
"specified segment not supported by rdf output format");
return;
}
if (wrt != NO_SEG) {
wrt = NO_SEG; /* continue to do _something_ */
nasm_error(ERR_NONFATAL, "WRT not supported by rdf output format");
}
if (segto == 2 && type != OUT_RESERVE) {
nasm_error(ERR_NONFATAL, "BSS segments may not be initialized");
/* just reserve the space for now... */
if (type == OUT_REL2ADR)
size = 2;
else
size = 4;
type = OUT_RESERVE;
}
if (type == OUT_RESERVE) {
if (segto == 2) /* BSS segment space reserverd */
bsslength += size;
else
while (size--)
membufwrite(segto, databuf, 1);
} else if (type == OUT_RAWDATA) {
membufwrite(segto, data, size);
} else if (type == OUT_ADDRESS) {
int asize = abs((int)size);
/* if segment == NO_SEG then we are writing an address of an
object within the same segment - do not produce reloc rec. */
/* FIXME - is this behaviour sane? at first glance it doesn't
appear to be. Must test this thoroughly...! */
if (segment != NO_SEG) {
/* it's an address, so we must write a relocation record */
rr.type = RDFREC_RELOC; /* type signature */
rr.reclen = 8;
rr.segment = segto; /* segment we're currently in */
rr.offset = getsegmentlength(segto); /* current offset */
rr.length = asize; /* length of reference */
rr.refseg = segment; /* segment referred to */
write_reloc_rec(&rr);
}
pd = databuf; /* convert address to little-endian */
WRITEADDR(pd, *(int64_t *)data, asize);
membufwrite(segto, databuf, asize);
} else if (type == OUT_REL2ADR) {
if (segment == segto)
nasm_panic("intra-segment OUT_REL2ADR");
rr.reclen = 8;
rr.offset = getsegmentlength(segto); /* current offset */
rr.length = 2; /* length of reference */
rr.refseg = segment; /* segment referred to (will be >>1'd) */
if (segment != NO_SEG && segment % 2) {
rr.type = RDFREC_SEGRELOC;
rr.segment = segto; /* memory base refs *aren't ever* relative! */
write_reloc_rec(&rr);
/* what do we put in the code? Simply the data. This should almost
* always be zero, unless someone's doing segment arithmetic...
*/
rr.offset = *(int64_t *)data;
} else {
rr.type = RDFREC_RELOC; /* type signature */
rr.segment = segto + 64; /* segment we're currently in + rel flag */
write_reloc_rec(&rr);
/* work out what to put in the code: offset of the end of this operand,
* subtracted from any data specified, so that loader can just add
* address of imported symbol onto it to get address relative to end of
* instruction: import_address + data(offset) - end_of_instrn */
rr.offset = *(int32_t *)data - (rr.offset + size);
}
membufwrite(segto, &rr.offset, -2);
} else if (type == OUT_REL4ADR) {
if ((segment == segto) && (globalbits != 64))
nasm_panic("intra-segment OUT_REL4ADR");
if (segment != NO_SEG && segment % 2) {
nasm_panic("erm... 4 byte segment base ref?");
}
rr.type = RDFREC_RELOC; /* type signature */
rr.segment = segto + 64; /* segment we're currently in + rel tag */
rr.offset = getsegmentlength(segto); /* current offset */
rr.length = 4; /* length of reference */
rr.refseg = segment; /* segment referred to */
rr.reclen = 8;
write_reloc_rec(&rr);
rr.offset = *(int64_t *)data - (rr.offset + size);
membufwrite(segto, &rr.offset, -4);
}
}
static void rdf2_cleanup(void)
{
int32_t l;
struct BSSRec bs;
int i;
/* should write imported & exported symbol declarations to header here */
/* generate the output file... */
nasm_write(RDOFF2Id, 6, ofile); /* file type magic number */
if (bsslength != 0) { /* reserve BSS */
bs.type = RDFREC_BSS;
bs.amount = bsslength;
bs.reclen = 4;
write_bss_rec(&bs);
}
/*
* calculate overall length of the output object
*/
l = headerlength + 4;
for (i = 0; i < nsegments; i++) {
if (i == 2)
continue; /* skip BSS segment */
l += 10 + segments[i].seglength;
}
l += 10; /* null segment */
fwriteint32_t(l, ofile);
fwriteint32_t(headerlength, ofile);
saa_fpwrite(header, ofile); /* dump header */
saa_free(header);
for (i = 0; i < nsegments; i++) {
if (i == 2)
continue;
fwriteint16_t(segments[i].segtype, ofile);
fwriteint16_t(segments[i].segnumber, ofile);
fwriteint16_t(segments[i].segreserved, ofile);
fwriteint32_t(segments[i].seglength, ofile);
saa_fpwrite(seg[i], ofile);
saa_free(seg[i]);
}
/* null segment - write 10 bytes of zero */
fwriteint32_t(0, ofile);
fwriteint32_t(0, ofile);
fwriteint16_t(0, ofile);
}
/*
* Handle RDOFF2 specific directives
*/
static enum directive_result
rdf2_directive(enum directive directive, char *value)
{
size_t n;
switch (directive) {
case D_LIBRARY:
n = strlen(value);
if (n >= MODLIB_NAME_MAX) {
nasm_error(ERR_NONFATAL, "name size exceeds %d bytes", MODLIB_NAME_MAX);
return DIRR_ERROR;
}
if (pass_first()) { /* XXX */
struct DLLRec r;
r.type = RDFREC_DLL;
r.reclen = n + 1;
strcpy(r.libname, value);
write_dll_rec(&r);
}
return DIRR_OK;
case D_MODULE:
if ((n = strlen(value)) >= MODLIB_NAME_MAX) {
nasm_error(ERR_NONFATAL, "name size exceeds %d bytes", MODLIB_NAME_MAX);
return DIRR_ERROR;
}
if (pass_first()) { /* XXX */
struct ModRec r;
r.type = RDFREC_MODNAME;
r.reclen = n + 1;
strcpy(r.modname, value);
write_modname_rec(&r);
}
return DIRR_OK;
default:
return DIRR_UNKNOWN;
}
}
extern macros_t rdf2_stdmac[];
const struct ofmt of_rdf2 = {
"Relocatable Dynamic Object File Format v2.0",
"rdf",
".rdf",
0,
64,
null_debug_arr,
&null_debug_form,
rdf2_stdmac,
rdf2_init,
null_reset,
nasm_do_legacy_output,
rdf2_out,
rdf2_deflabel,
rdf2_section_names,
NULL,
null_sectalign,
null_segbase,
rdf2_directive,
rdf2_cleanup,
NULL /* pragma list */
};
#endif /* OF_RDF2 */
Reference in New Issue View Git Blame Copy Permalink