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output/coff: Support for COMDAT sections

Browse Source 
Signed-off-by: "Glücksmann, Igor" <igor.glucksmann@avast.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
This commit is contained in:
Igor Glucksmann 2021-03-31 15:23:11 +02:00 committed by Cyrill Gorcunov
parent 4b5224ba8f
commit ed2c609976
7 changed files with 275 additions and 23 deletions
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2
Makefile.in
View File

@ -108,7 +108,7 @@ LIBOBJ_NW = stdlib/snprintf.$(O) stdlib/vsnprintf.$(O) stdlib/strlcpy.$(O) \
\
nasmlib/ver.$(O) \
nasmlib/alloc.$(O) nasmlib/asprintf.$(O) nasmlib/errfile.$(O) \
nasmlib/crc64.$(O) nasmlib/md5c.$(O) \
nasmlib/crc32.$(O) nasmlib/crc64.$(O) nasmlib/md5c.$(O) \
nasmlib/string.$(O) nasmlib/nctype.$(O) \
nasmlib/file.$(O) nasmlib/mmap.$(O) nasmlib/ilog2.$(O) \
nasmlib/realpath.$(O) nasmlib/path.$(O) \

2
Mkfiles/msvc.mak
View File

@ -72,7 +72,7 @@ LIBOBJ_NW = stdlib\snprintf.$(O) stdlib\vsnprintf.$(O) stdlib\strlcpy.$(O) \
\
nasmlib\ver.$(O) \
nasmlib\alloc.$(O) nasmlib\asprintf.$(O) nasmlib\errfile.$(O) \
nasmlib\crc64.$(O) nasmlib\md5c.$(O) \
nasmlib\crc32.$(O) nasmlib\crc64.$(O) nasmlib\md5c.$(O) \
nasmlib\string.$(O) nasmlib\nctype.$(O) \
nasmlib\file.$(O) nasmlib\mmap.$(O) nasmlib\ilog2.$(O) \
nasmlib\realpath.$(O) nasmlib\path.$(O) \

2
Mkfiles/openwcom.mak
View File

@ -61,7 +61,7 @@ LIBOBJ_NW = stdlib\snprintf.$(O) stdlib\vsnprintf.$(O) stdlib\strlcpy.$(O) &
&
nasmlib\ver.$(O) &
nasmlib\alloc.$(O) nasmlib\asprintf.$(O) nasmlib\errfile.$(O) &
nasmlib\crc64.$(O) nasmlib\md5c.$(O) &
nasmlib\crc32.$(O) nasmlib\crc64.$(O) nasmlib\md5c.$(O) &
nasmlib\string.$(O) nasmlib\nctype.$(O) &
nasmlib\file.$(O) nasmlib\mmap.$(O) nasmlib\ilog2.$(O) &
nasmlib\realpath.$(O) nasmlib\path.$(O) &

2
include/hashtbl.h
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@ -79,6 +79,8 @@ static inline uint64_t crc64_byte(uint64_t crc, uint8_t v)
return crc64_tab[(uint8_t)(v ^ crc)] ^ (crc >> 8);
}
uint32_t crc32b(uint32_t crc, const void *data, size_t len);
void **hash_find(struct hash_table *head, const char *string,
struct hash_insert *insert);
void **hash_findb(struct hash_table *head, const void *key, size_t keylen,

115
nasmlib/crc32.c Normal file
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@ -0,0 +1,115 @@
/* ----------------------------------------------------------------------- *
*
* Copyright 1996-2021 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.
*
* ----------------------------------------------------------------------- */
#include "compiler.h"
#include "hashtbl.h"
const uint32_t crc32_tab[256] = {
0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
};
uint32_t crc32b(uint32_t crc, const void *data, size_t len)
{
register const uint8_t *p = data;
register uint32_t hashval = crc;
while (len--)
{
hashval = (hashval >> 8) ^ crc32_tab[(hashval ^ *p++) & 0xff];
}
return hashval;
};

168
output/outcoff.c
View File

@ -184,6 +184,7 @@ static void coff_write(void);
static void coff_section_header(char *, int32_t, int32_t, int32_t, int32_t, int32_t, int, int32_t);
static void coff_write_relocs(struct coff_Section *);
static void coff_write_symbols(void);
static void coff_defcomdatname(char *name, int32_t segment);
static void coff_win32_init(void)
{
@ -238,6 +239,7 @@ static void coff_cleanup(void)
nasm_free(r);
}
nasm_free(coff_sects[i]->name);
nasm_free(coff_sects[i]->comdat_name);
nasm_free(coff_sects[i]);
}
nasm_free(coff_sects);
@ -306,9 +308,10 @@ static inline unsigned int coff_alignment(uint32_t flags)
static int32_t coff_section_names(char *name, int *bits)
{
char *p;
char *p, *comdat_name;
uint32_t flags, align_flags;
int i;
int i, j;
int8_t comdat_selection;
/*
* Set default bits.
@ -333,7 +336,8 @@ static int32_t coff_section_names(char *name, int *bits)
name[8] = '\0';
}
}
flags = align_flags = 0;
flags = align_flags = comdat_selection = 0;
comdat_name = NULL;
while (*p && nasm_isspace(*p))
p++;
@ -386,12 +390,45 @@ static int32_t coff_section_names(char *name, int *bits)
align_flags = coff_sectalign_flags(align);
}
}
} else if (!nasm_strnicmp(q, "comdat=", 7)) {
/*
* Expected format: comdat=num:name]
* where
* num is a number: one of the IMAGE_COMDAT_SELECT_* constants
* name is a string: the "COMDAT name"
*/
comdat_selection = strtoul(q + 7, &q, 10);
if (!comdat_selection)
nasm_nonfatal("invalid argument to `comdat'");
else if (*q != ':')
nasm_nonfatal("missing name in `comdat'");
else {
comdat_name = q + 1;
}
}
}
for (i = 0; i < coff_nsects; i++)
if (!strcmp(name, coff_sects[i]->name))
break;
if (!strcmp(name, coff_sects[i]->name)) {
if (!comdat_name && !coff_sects[i]->comdat_name)
break;
else if (comdat_name && coff_sects[i]->comdat_name &&
!strcmp(comdat_name, coff_sects[i]->comdat_name)) {
/*
* For COMDAT, it makes sense to have multiple sections with
* the same name (different comdat name though)
*/
if ((coff_sects[i]->comdat_selection == IMAGE_COMDAT_SELECT_ASSOCIATIVE &&
comdat_selection == IMAGE_COMDAT_SELECT_ASSOCIATIVE) ||
(coff_sects[i]->comdat_selection != IMAGE_COMDAT_SELECT_ASSOCIATIVE &&
comdat_selection != IMAGE_COMDAT_SELECT_ASSOCIATIVE)) {
/*
* Let's also allow an associative/other pair with the same name
*/
break;
}
}
}
if (i == coff_nsects) {
if (!flags) {
flags = TEXT_FLAGS;
@ -409,10 +446,37 @@ static int32_t coff_section_names(char *name, int *bits)
flags = XDATA_FLAGS;
}
}
if (comdat_name)
flags |= IMAGE_SCN_LNK_COMDAT;
i = coff_make_section(name, flags);
coff_sects[i]->align_flags = align_flags;
if (comdat_name) {
coff_sects[i]->comdat_selection = comdat_selection;
coff_sects[i]->comdat_name = strdup(comdat_name);
if (comdat_selection == IMAGE_COMDAT_SELECT_ASSOCIATIVE) {
/*
* Find a previous section with given comdat name
*/
for (j = 0; j < coff_nsects - 1; j++)
if (coff_sects[j]->comdat_name &&
!strcmp(coff_sects[j]->comdat_name, comdat_name))
break;
if (j < coff_nsects - 1) {
coff_sects[i]->comdat_associated = j + 1;
}
else
nasm_nonfatal("unknown `comdat' associative");
}
}
} else {
if (flags) {
if (comdat_name)
flags |= IMAGE_SCN_LNK_COMDAT;
/* Warn if non-alignment flags differ */
if (((flags ^ coff_sects[i]->flags) & ~IMAGE_SCN_ALIGN_MASK) &&
coff_sects[i]->pass_last_seen == pass_count()) {
@ -428,6 +492,14 @@ static int32_t coff_section_names(char *name, int *bits)
if (align_flags > coff_sects[i]->align_flags) {
coff_sects[i]->align_flags = align_flags;
}
if (comdat_name) {
if ((coff_sects[i]->comdat_selection != comdat_selection) &&
coff_sects[i]->pass_last_seen == pass_count()) {
nasm_warn(WARN_OTHER, "comdat selection changed on"
" redeclaration of name `%s'", comdat_name);
}
}
}
coff_sects[i]->pass_last_seen = pass_count();
@ -437,7 +509,7 @@ static int32_t coff_section_names(char *name, int *bits)
static void coff_deflabel(char *name, int32_t segment, int64_t offset,
int is_global, char *special)
{
int pos = strslen + 4;
int pos, section;
struct coff_Symbol *sym;
if (special)
@ -450,6 +522,32 @@ static void coff_deflabel(char *name, int32_t segment, int64_t offset,
return;
}
if (segment == NO_SEG)
section = -1; /* absolute symbol */
else {
int i;
section = 0;
for (i = 0; i < coff_nsects; i++)
if (segment == coff_sects[i]->index) {
section = i + 1;
if (coff_sects[i]->comdat_name && !coff_sects[i]->comdat_symbol) {
/*
* The "comdat symbol" must be the first one in symbol table
* So we'll insert/define it - before defining the other one
*/
coff_sects[i]->comdat_symbol = 1;
if (coff_sects[i]->comdat_selection != IMAGE_COMDAT_SELECT_ASSOCIATIVE &&
0 != strcmp(coff_sects[i]->comdat_name, name)) {
coff_defcomdatname(coff_sects[i]->comdat_name, segment);
}
}
break;
}
}
pos = strslen + 4;
if (strlen(name) > 8) {
size_t nlen = strlen(name)+1;
saa_wbytes(coff_strs, name, nlen);
@ -465,19 +563,9 @@ static void coff_deflabel(char *name, int32_t segment, int64_t offset,
strcpy(sym->name, name);
sym->is_global = !!is_global;
sym->type = 0; /* Default to T_NULL (no type) */
if (segment == NO_SEG)
sym->section = -1; /* absolute symbol */
else {
int i;
sym->section = 0;
for (i = 0; i < coff_nsects; i++)
if (segment == coff_sects[i]->index) {
sym->section = i + 1;
break;
}
if (!sym->section)
sym->is_global = true;
}
sym->section = section;
if (!sym->section)
sym->is_global = true;
if (is_global == 2)
sym->value = offset;
else
@ -740,6 +828,11 @@ static void BuildExportTable(STRING **rvp)
*rvp = NULL;
}
static void coff_defcomdatname(char *name, int32_t segment)
{
coff_deflabel(name, segment, 0, 1, NULL);
}
static enum directive_result
coff_directives(enum directive directive, char *value)
{
@ -906,6 +999,17 @@ static void coff_write(void)
coff_deflabel("@feat.00", NO_SEG, 1, 0, NULL);
}
/*
* Check if all comdat sections have their comdat symbol
* If not, define it
*/
for (i = 0; i < coff_nsects; i++) {
if (coff_sects[i]->comdat_name && !coff_sects[i]->comdat_symbol &&
coff_sects[i]->comdat_selection != IMAGE_COMDAT_SELECT_ASSOCIATIVE) {
coff_defcomdatname(coff_sects[i]->comdat_name, coff_sects[i]->index);
}
}
/*
* Work out how big the file will get.
* Calculate the start of the `real' symbols at the same time.
@ -961,6 +1065,22 @@ static void coff_write(void)
if (coff_sects[i]->data) {
saa_fpwrite(coff_sects[i]->data, ofile);
coff_write_relocs(coff_sects[i]);
if (coff_sects[i]->flags & IMAGE_SCN_LNK_COMDAT) {
/*
* Checksum the section data
*/
uint32_t checksum = 0;
const char *data;
size_t len;
saa_rewind(coff_sects[i]->data);
while (len = coff_sects[i]->data->datalen,
(data = saa_rbytes(coff_sects[i]->data, &len)) != NULL)
checksum = crc32b(checksum, data, len);
coff_sects[i]->checksum = checksum;
}
}
/*
@ -1091,7 +1211,15 @@ static void coff_write_symbols(void)
coff_symbol(coff_sects[i]->name, 0L, 0L, i + 1, 0, 3, 1);
fwriteint32_t(coff_sects[i]->len, ofile);
fwriteint16_t(coff_sects[i]->nrelocs,ofile);
nasm_write(filename, 12, ofile);
if (coff_sects[i]->flags & IMAGE_SCN_LNK_COMDAT) {
fwriteint16_t(0, ofile);
fwriteint32_t(coff_sects[i]->checksum, ofile);
fwriteint16_t(coff_sects[i]->comdat_associated, ofile);
fputc(coff_sects[i]->comdat_selection, ofile);
nasm_write(filename, 3, ofile);
}
else
nasm_write(filename, 12, ofile);
}
/*

7
output/pecoff.h
View File

@ -487,6 +487,13 @@ struct coff_Section {
int32_t namepos; /* Offset of name into the strings table */
int32_t pos, relpos;
int64_t pass_last_seen;
/* comdat-related members */
char *comdat_name;
uint32_t checksum; /* set only for comdat sections */
int8_t comdat_selection;
int8_t comdat_symbol; /* is the "comdat name" in symbol table? */
int32_t comdat_associated; /* associated section for selection==5 */
};
struct coff_Reloc {