xfnw/plan9fox
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

aux/aout2uimage: fix text section size rounding (for data section alignment)

Browse source 
the a.out header is not considered part of the image and
should not be loaded. it also has no contribution to the
rounding of the text section size.
This commit is contained in:
cinap_lenrek 2022-04-23 18:27:31 +00:00 committed by xfnw
parent ddabc765ca
commit 36b0897a42
1 changed files with 17 additions and 17 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

34
sys/src/cmd/aux/aout2uimage.c
View file

@ -100,9 +100,10 @@ main(int argc, char **argv)
{
Fhdr fhdr;
u64int kzero;
ulong rtext;
uchar header[64];
char *ofile, *iname;
int n, arch;
int arch;
kzero = 0xF0000000;
ofile = nil;
@ -116,7 +117,10 @@ main(int argc, char **argv)
infd = open(argv[0], OREAD);
if(infd < 0) sysfatal("infd: %r");
if(crackhdr(infd, &fhdr) == 0) sysfatal("crackhdr: %r");
if((uint)mach->mtype >= nelem(archtab) || archtab[mach->mtype] == 0)
sysfatal("archloch");
arch = archtab[mach->mtype];
assert(sizeof(buf) >= mach->pgsize);
iname = strrchr(argv[0], '/');
if(iname != nil)
iname++;
@ -127,29 +131,25 @@ main(int argc, char **argv)
if(outfd < 0) sysfatal("create: %r");
tab = mkcrctab(0xEDB88320);
assert(sizeof(buf) >= mach->pgsize);
seek(infd, 0, 0);
seek(infd, fhdr.hdrsz, 0); /* a.out header not part of the image */
seek(outfd, sizeof(header), 0);
dcrc = 0;
copy(fhdr.hdrsz + fhdr.txtsz);
n = -(fhdr.hdrsz + fhdr.txtsz) & mach->pgsize - 1;
if(n > 0){
memset(buf, 0, n);
if(write(outfd, buf, n) < 0) sysfatal("write: %r");
dcrc = blockcrc(tab, dcrc, buf, n);
copy(fhdr.txtsz);
/* round text out to page boundary (see rebootcmd()) */
rtext = ((fhdr.entry + fhdr.txtsz + mach->pgsize-1) & -mach->pgsize) - fhdr.entry;
if(rtext > fhdr.txtsz){
memset(buf, 0, rtext - fhdr.txtsz);
if(write(outfd, buf, rtext - fhdr.txtsz) < 0) sysfatal("write: %r");
dcrc = blockcrc(tab, dcrc, buf, rtext - fhdr.txtsz);
}
copy(fhdr.datsz);
if((uint)mach->mtype >= nelem(archtab) || archtab[mach->mtype] == 0)
sysfatal("archloch");
arch = archtab[mach->mtype];
memset(header, 0, sizeof(header));
put(&header[0], 0x27051956); /* magic */
put(&header[8], time(0)); /* time */
put(&header[12], -(-(fhdr.hdrsz + fhdr.txtsz) & -mach->pgsize) + fhdr.datsz); /* image size */
put(&header[16], fhdr.txtaddr - fhdr.hdrsz - kzero); /* load address */
put(&header[12], rtext + fhdr.datsz); /* image size */
put(&header[16], fhdr.txtaddr - kzero); /* load address */
put(&header[20], fhdr.entry - kzero); /* entry point */
put(&header[24], dcrc); /* data crc */
header[28] = 23; /* os = plan 9 */