void
main(int argc, char *argv[])
{
char *p;
Sym *s;
Binit(&bso, 1, OWRITE);
listinit();
nerrors = 0;
outfile = "5.out";
HEADTYPE = -1;
INITTEXT = -1;
INITDAT = -1;
INITRND = -1;
INITENTRY = 0;
linkmode = LinkAuto;
nuxiinit();
p = getgoarm();
if(p != nil)
goarm = atoi(p);
else
goarm = 6;
if(goarm == 5)
debug['F'] = 1;
flagcount("1", "use alternate profiling code", &debug['1']);
flagfn1("B", "info: define ELF NT_GNU_BUILD_ID note", addbuildinfo);
flagstr("E", "sym: entry symbol", &INITENTRY);
flagint32("D", "addr: data address", &INITDAT);
flagcount("G", "debug pseudo-ops", &debug['G']);
flagfn1("I", "interp: set ELF interp", setinterp);
flagfn1("L", "dir: add dir to library path", Lflag);
flagfn1("H", "head: header type", setheadtype);
flagcount("K", "add stack underflow checks", &debug['K']);
flagcount("M", "disable software div/mod", &debug['M']);
flagcount("O", "print pc-line tables", &debug['O']);
flagcount("P", "debug code generation", &debug['P']);
flagint32("R", "rnd: address rounding", &INITRND);
flagint32("T", "addr: text address", &INITTEXT);
flagfn0("V", "print version and exit", doversion);
flagcount("W", "disassemble input", &debug['W']);
flagfn2("X", "name value: define string data", addstrdata);
flagcount("Z", "clear stack frame on entry", &debug['Z']);
flagcount("a", "disassemble output", &debug['a']);
flagcount("c", "dump call graph", &debug['c']);
flagcount("d", "disable dynamic executable", &debug['d']);
flagstr("extld", "linker to run in external mode", &extld);
flagstr("extldflags", "flags for external linker", &extldflags);
flagcount("f", "ignore version mismatch", &debug['f']);
flagcount("g", "disable go package data checks", &debug['g']);
flagstr("k", "sym: set field tracking symbol", &tracksym);
flagfn1("linkmode", "mode: set link mode (internal, external, auto)", setlinkmode);
flagcount("n", "dump symbol table", &debug['n']);
flagstr("o", "outfile: set output file", &outfile);
flagcount("p", "insert profiling code", &debug['p']);
flagstr("r", "dir1:dir2:...: set ELF dynamic linker search path", &rpath);
flagcount("race", "enable race detector", &flag_race);
flagcount("s", "disable symbol table", &debug['s']);
flagcount("shared", "generate shared object (implies -linkmode external)", &flag_shared);
flagstr("tmpdir", "leave temporary files in this directory", &tmpdir);
flagcount("u", "reject unsafe packages", &debug['u']);
flagcount("v", "print link trace", &debug['v']);
flagcount("w", "disable DWARF generation", &debug['w']);
flagparse(&argc, &argv, usage);
if(argc != 1)
usage();
if(flag_shared)
linkmode = LinkExternal;
mywhatsys();
if(HEADTYPE == -1)
HEADTYPE = headtype(goos);
// getgoextlinkenabled is based on GO_EXTLINK_ENABLED when
// Go was built; see ../../make.bash.
if(linkmode == LinkAuto && strcmp(getgoextlinkenabled(), "0") == 0)
linkmode = LinkInternal;
switch(HEADTYPE) {
default:
if(linkmode == LinkAuto)
linkmode = LinkInternal;
if(linkmode == LinkExternal && strcmp(getgoextlinkenabled(), "1") != 0)
sysfatal("cannot use -linkmode=external with -H %s", headstr(HEADTYPE));
break;
case Hlinux:
break;
}
libinit();
switch(HEADTYPE) {
default:
diag("unknown -H option");
errorexit();
case Hnoheader: /* no header */
HEADR = 0L;
if(INITTEXT == -1)
INITTEXT = 0;
if(INITDAT == -1)
INITDAT = 0;
if(INITRND == -1)
INITRND = 4;
break;
case Hrisc: /* aif for risc os */
HEADR = 128L;
if(INITTEXT == -1)
INITTEXT = 0x10005000 + HEADR;
if(INITDAT == -1)
INITDAT = 0;
if(INITRND == -1)
INITRND = 4;
break;
case Hplan9x32: /* plan 9 */
HEADR = 32L;
if(INITTEXT == -1)
INITTEXT = 4128;
if(INITDAT == -1)
INITDAT = 0;
if(INITRND == -1)
INITRND = 4096;
break;
case Hixp1200: /* boot for IXP1200 */
HEADR = 0L;
if(INITTEXT == -1)
INITTEXT = 0x0;
if(INITDAT == -1)
INITDAT = 0;
if(INITRND == -1)
INITRND = 4;
break;
case Hipaq: /* boot for ipaq */
HEADR = 16L;
if(INITTEXT == -1)
INITTEXT = 0xC0008010;
if(INITDAT == -1)
INITDAT = 0;
if(INITRND == -1)
INITRND = 1024;
break;
case Hlinux: /* arm elf */
case Hfreebsd:
case Hnetbsd:
debug['d'] = 0; // with dynamic linking
tlsoffset = -8; // hardcoded number, first 4-byte word for g, and then 4-byte word for m
// this number is known to ../../pkg/runtime/rt0_*_arm.s
elfinit();
HEADR = ELFRESERVE;
if(INITTEXT == -1)
INITTEXT = 0x10000 + HEADR;
if(INITDAT == -1)
INITDAT = 0;
if(INITRND == -1)
INITRND = 4096;
break;
}
if(INITDAT != 0 && INITRND != 0)
print("warning: -D0x%ux is ignored because of -R0x%ux\n",
INITDAT, INITRND);
if(debug['v'])
Bprint(&bso, "HEADER = -H0x%d -T0x%ux -D0x%ux -R0x%ux\n",
HEADTYPE, INITTEXT, INITDAT, INITRND);
Bflush(&bso);
zprg.as = AGOK;
zprg.scond = 14;
zprg.reg = NREG;
zprg.from.name = D_NONE;
zprg.from.type = D_NONE;
zprg.from.reg = NREG;
zprg.to = zprg.from;
buildop();
histgen = 0;
pc = 0;
dtype = 4;
version = 0;
cbp = buf.cbuf;
cbc = sizeof(buf.cbuf);
// embed goarm to runtime.goarm
s = lookup("runtime.goarm", 0);
s->dupok = 1;
adduint8(s, goarm);
addlibpath("command line", "command line", argv[0], "main");
loadlib();
// mark some functions that are only referenced after linker code editing
if(debug['F'])
mark(rlookup("_sfloat", 0));
mark(lookup("runtime.read_tls_fallback", 0));
deadcode();
if(textp == nil) {
diag("no code");
errorexit();
}
patch();
if(debug['p'])
if(debug['1'])
doprof1();
else
doprof2();
doelf();
follow();
softfloat();
// 5l -Z means zero the stack frame on entry.
// This slows down function calls but can help avoid
// false positives in garbage collection.
if(debug['Z'])
dozerostk();
noops(); // generate stack split prolog, handle div/mod, etc.
dostkcheck();
span();
addexport();
// textaddress() functionality is handled in span()
pclntab();
symtab();
dodata();
address();
doweak();
reloc();
asmb();
undef();
hostlink();
if(debug['c'])
print("ARM size = %d\n", armsize);
if(debug['v']) {
Bprint(&bso, "%5.2f cpu time\n", cputime());
Bprint(&bso, "%d sizeof adr\n", sizeof(Adr));
Bprint(&bso, "%d sizeof prog\n", sizeof(Prog));
}
Bflush(&bso);
errorexit();
}
Link*
linknew(LinkArch *arch)
{
Link *ctxt;
char *p;
char buf[1024];
nuxiinit();
ctxt = emallocz(sizeof *ctxt);
ctxt->arch = arch;
ctxt->version = HistVersion;
ctxt->goroot = getgoroot();
ctxt->goroot_final = getenv("GOROOT_FINAL");
if(ctxt->goroot_final != nil && ctxt->goroot_final[0] == '\0')
ctxt->goroot_final = nil;
p = getgoarch();
if(strcmp(p, arch->name) != 0)
sysfatal("invalid goarch %s (want %s)", p, arch->name);
if(getwd(buf, sizeof buf) == 0)
strcpy(buf, "/???");
if(yy_isalpha(buf[0]) && buf[1] == ':') {
// On Windows.
ctxt->windows = 1;
// Canonicalize path by converting \ to / (Windows accepts both).
for(p=buf; *p; p++)
if(*p == '\\')
*p = '/';
}
ctxt->pathname = strdup(buf);
ctxt->headtype = headtype(getgoos());
if(ctxt->headtype < 0)
sysfatal("unknown goos %s", getgoos());
// Record thread-local storage offset.
// TODO(rsc): Move tlsoffset back into the linker.
switch(ctxt->headtype) {
default:
sysfatal("unknown thread-local storage offset for %s", headstr(ctxt->headtype));
case Hplan9:
ctxt->tlsoffset = -2*ctxt->arch->ptrsize;
break;
case Hwindows:
break;
case Hlinux:
case Hfreebsd:
case Hnetbsd:
case Hopenbsd:
case Hdragonfly:
case Hsolaris:
/*
* ELF uses TLS offset negative from FS.
* Translate 0(FS) and 8(FS) into -16(FS) and -8(FS).
* Known to low-level assembly in package runtime and runtime/cgo.
*/
ctxt->tlsoffset = -2*ctxt->arch->ptrsize;
break;
case Hnacl:
switch(ctxt->arch->thechar) {
default:
sysfatal("unknown thread-local storage offset for nacl/%s", ctxt->arch->name);
case '6':
ctxt->tlsoffset = 0;
break;
case '8':
ctxt->tlsoffset = -8;
break;
}
break;
case Hdarwin:
/*
* OS X system constants - offset from 0(GS) to our TLS.
* Explained in ../../pkg/runtime/cgo/gcc_darwin_*.c.
*/
switch(ctxt->arch->thechar) {
default:
sysfatal("unknown thread-local storage offset for darwin/%s", ctxt->arch->name);
case '6':
ctxt->tlsoffset = 0x8a0;
break;
case '8':
ctxt->tlsoffset = 0x468;
break;
}
break;
}
// On arm, record goarm.
if(ctxt->arch->thechar == '5') {
p = getgoarm();
if(p != nil)
ctxt->goarm = atoi(p);
else
ctxt->goarm = 6;
}
return ctxt;
}
