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go/src/cmd/5l/asm.c

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// Inferno utils/5l/asm.c
// http://code.google.com/p/inferno-os/source/browse/utils/5l/asm.c
//
// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
// Portions Copyright © 1997-1999 Vita Nuova Limited
// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
// Portions Copyright © 2004,2006 Bruce Ellis
// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
// Portions Copyright © 2009 The Go Authors. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// Writing object files.
#include "l.h"
#include "../ld/lib.h"
#include "../ld/elf.h"
#include "../ld/dwarf.h"
static Prog *PP;
char linuxdynld[] = "/lib/ld-linux.so.3"; // 2 for OABI, 3 for EABI
int32
entryvalue(void)
{
char *a;
Sym *s;
a = INITENTRY;
if(*a >= '0' && *a <= '9')
return atolwhex(a);
s = lookup(a, 0);
if(s->type == 0)
return INITTEXT;
if(s->type != STEXT)
diag("entry not text: %s", s->name);
return s->value;
}
enum {
ElfStrEmpty,
ElfStrInterp,
ElfStrHash,
ElfStrGot,
ElfStrGotPlt,
ElfStrDynamic,
ElfStrDynsym,
ElfStrDynstr,
ElfStrRel,
ElfStrText,
ElfStrData,
ElfStrBss,
ElfStrSymtab,
ElfStrStrtab,
ElfStrShstrtab,
ElfStrRelPlt,
ElfStrPlt,
ElfStrGnuVersion,
ElfStrGnuVersionR,
ElfStrNoteNetbsdIdent,
ElfStrNoteOpenbsdIdent,
ElfStrNoPtrData,
ElfStrNoPtrBss,
NElfStr
};
vlong elfstr[NElfStr];
static int
needlib(char *name)
{
char *p;
Sym *s;
if(*name == '\0')
return 0;
/* reuse hash code in symbol table */
p = smprint(".dynlib.%s", name);
s = lookup(p, 0);
free(p);
if(s->type == 0) {
s->type = 100; // avoid SDATA, etc.
return 1;
}
return 0;
}
int nelfsym = 1;
static void addpltsym(Sym*);
static void addgotsym(Sym*);
static void addgotsyminternal(Sym*);
// Preserve highest 8 bits of a, and do addition to lower 24-bit
// of a and b; used to adjust ARM branch intruction's target
static int32
braddoff(int32 a, int32 b)
{
return (((uint32)a) & 0xff000000U) | (0x00ffffffU & (uint32)(a + b));
}
void
adddynrel(Sym *s, Reloc *r)
{
Sym *targ, *rel;
targ = r->sym;
cursym = s;
switch(r->type) {
default:
if(r->type >= 256) {
diag("unexpected relocation type %d", r->type);
return;
}
break;
// Handle relocations found in ELF object files.
case 256 + R_ARM_PLT32:
r->type = D_CALL;
if(targ->dynimpname != nil && !targ->dynexport) {
addpltsym(targ);
r->sym = lookup(".plt", 0);
r->add = braddoff(r->add, targ->plt / 4);
}
return;
case 256 + R_ARM_THM_PC22: // R_ARM_THM_CALL
diag("R_ARM_THM_CALL, are you using -marm?");
errorexit();
return;
case 256 + R_ARM_GOT32: // R_ARM_GOT_BREL
if(targ->dynimpname == nil || targ->dynexport) {
addgotsyminternal(targ);
} else {
addgotsym(targ);
}
r->type = D_CONST; // write r->add during relocsym
r->sym = S;
r->add += targ->got;
return;
case 256 + R_ARM_GOT_PREL: // GOT(S) + A - P
if(targ->dynimpname == nil || targ->dynexport) {
addgotsyminternal(targ);
} else {
addgotsym(targ);
}
r->type = D_PCREL;
r->sym = lookup(".got", 0);
r->add += targ->got + 4;
return;
case 256 + R_ARM_GOTOFF: // R_ARM_GOTOFF32
r->type = D_GOTOFF;
return;
case 256 + R_ARM_GOTPC: // R_ARM_BASE_PREL
r->type = D_PCREL;
r->sym = lookup(".got", 0);
r->add += 4;
return;
case 256 + R_ARM_CALL:
r->type = D_CALL;
if(targ->dynimpname != nil && !targ->dynexport) {
addpltsym(targ);
r->sym = lookup(".plt", 0);
r->add = braddoff(r->add, targ->plt / 4);
}
return;
case 256 + R_ARM_REL32: // R_ARM_REL32
r->type = D_PCREL;
r->add += 4;
return;
case 256 + R_ARM_ABS32:
if(targ->dynimpname != nil && !targ->dynexport)
diag("unexpected R_ARM_ABS32 relocation for dynamic symbol %s", targ->name);
r->type = D_ADDR;
return;
case 256 + R_ARM_V4BX:
// we can just ignore this, because we are targeting ARM V5+ anyway
if(r->sym) {
// R_ARM_V4BX is ABS relocation, so this symbol is a dummy symbol, ignore it
r->sym->type = 0;
}
r->sym = S;
return;
case 256 + R_ARM_PC24:
case 256 + R_ARM_JUMP24:
r->type = D_CALL;
if(targ->dynimpname != nil && !targ->dynexport) {
addpltsym(targ);
r->sym = lookup(".plt", 0);
r->add = braddoff(r->add, targ->plt / 4);
}
return;
}
// Handle references to ELF symbols from our own object files.
if(targ->dynimpname == nil || targ->dynexport)
return;
switch(r->type) {
case D_PCREL:
addpltsym(targ);
r->sym = lookup(".plt", 0);
r->add = targ->plt;
return;
case D_ADDR:
if(s->type != SDATA)
break;
if(iself) {
adddynsym(targ);
rel = lookup(".rel", 0);
addaddrplus(rel, s, r->off);
adduint32(rel, ELF32_R_INFO(targ->dynid, R_ARM_GLOB_DAT)); // we need a S + A dynmic reloc
r->type = D_CONST; // write r->add during relocsym
r->sym = S;
return;
}
break;
}
cursym = s;
diag("unsupported relocation for dynamic symbol %s (type=%d stype=%d)", targ->name, r->type, targ->type);
}
static void
elfsetupplt(void)
{
Sym *plt, *got;
plt = lookup(".plt", 0);
got = lookup(".got.plt", 0);
if(plt->size == 0) {
// str lr, [sp, #-4]!
adduint32(plt, 0xe52de004);
// ldr lr, [pc, #4]
adduint32(plt, 0xe59fe004);
// add lr, pc, lr
adduint32(plt, 0xe08fe00e);
// ldr pc, [lr, #8]!
adduint32(plt, 0xe5bef008);
// .word &GLOBAL_OFFSET_TABLE[0] - .
addpcrelplus(plt, got, 4);
// the first .plt entry requires 3 .plt.got entries
adduint32(got, 0);
adduint32(got, 0);
adduint32(got, 0);
}
}
int
archreloc(Reloc *r, Sym *s, vlong *val)
{
switch(r->type) {
case D_CONST:
*val = r->add;
return 0;
case D_GOTOFF:
*val = symaddr(r->sym) + r->add - symaddr(lookup(".got", 0));
return 0;
// The following three arch specific relocations are only for generation of
// Linux/ARM ELF's PLT entry (3 assembler instruction)
case D_PLT0: // add ip, pc, #0xXX00000
if (symaddr(lookup(".got.plt", 0)) < symaddr(lookup(".plt", 0)))
diag(".got.plt should be placed after .plt section.");
*val = 0xe28fc600U +
(0xff & ((uint32)(symaddr(r->sym) - (symaddr(lookup(".plt", 0)) + r->off) + r->add) >> 20));
return 0;
case D_PLT1: // add ip, ip, #0xYY000
*val = 0xe28cca00U +
(0xff & ((uint32)(symaddr(r->sym) - (symaddr(lookup(".plt", 0)) + r->off) + r->add + 4) >> 12));
return 0;
case D_PLT2: // ldr pc, [ip, #0xZZZ]!
*val = 0xe5bcf000U +
(0xfff & (uint32)(symaddr(r->sym) - (symaddr(lookup(".plt", 0)) + r->off) + r->add + 8));
return 0;
case D_CALL: // bl XXXXXX or b YYYYYY
*val = braddoff((0xff000000U & (uint32)r->add),
(0xffffff & (uint32)
((symaddr(r->sym) + ((uint32)r->add) * 4 - (s->value + r->off)) / 4)));
return 0;
}
return -1;
}
static Reloc *
addpltreloc(Sym *plt, Sym *got, Sym *sym, int typ)
{
Reloc *r;
r = addrel(plt);
r->sym = got;
r->off = plt->size;
r->siz = 4;
r->type = typ;
r->add = sym->got - 8;
plt->reachable = 1;
plt->size += 4;
symgrow(plt, plt->size);
return r;
}
static void
addpltsym(Sym *s)
{
Sym *plt, *got, *rel;
if(s->plt >= 0)
return;
adddynsym(s);
if(iself) {
plt = lookup(".plt", 0);
got = lookup(".got.plt", 0);
rel = lookup(".rel", 0);
if(plt->size == 0)
elfsetupplt();
// .got entry
s->got = got->size;
adduint32(got, 0);
// .plt entry, this depends on the .got entry
s->plt = plt->size;
addpltreloc(plt, got, s, D_PLT0); // add lr, pc, #0xXX00000
addpltreloc(plt, got, s, D_PLT1); // add lr, lr, #0xYY000
addpltreloc(plt, got, s, D_PLT2); // ldr pc, [lr, #0xZZZ]!
// rel
addaddrplus(rel, got, s->got);
adduint32(rel, ELF32_R_INFO(s->dynid, R_ARM_JUMP_SLOT));
} else {
diag("addpltsym: unsupported binary format");
}
}
static void
addgotsyminternal(Sym *s)
{
Sym *got;
if(s->got >= 0)
return;
got = lookup(".got", 0);
s->got = got->size;
addaddrplus(got, s, 0);
if(iself) {
;
} else {
diag("addgotsyminternal: unsupported binary format");
}
}
static void
addgotsym(Sym *s)
{
Sym *got, *rel;
if(s->got >= 0)
return;
adddynsym(s);
got = lookup(".got", 0);
s->got = got->size;
adduint32(got, 0);
if(iself) {
rel = lookup(".rel", 0);
addaddrplus(rel, got, s->got);
adduint32(rel, ELF32_R_INFO(s->dynid, R_ARM_GLOB_DAT));
} else {
diag("addgotsym: unsupported binary format");
}
}
void
adddynsym(Sym *s)
{
Sym *d;
int t;
char *name;
if(s->dynid >= 0)
return;
if(s->dynimpname == nil) {
s->dynimpname = s->name;
//diag("adddynsym: no dynamic name for %s", s->name);
}
if(iself) {
s->dynid = nelfsym++;
d = lookup(".dynsym", 0);
/* name */
name = s->dynimpname;
if(name == nil)
name = s->name;
adduint32(d, addstring(lookup(".dynstr", 0), name));
/* value */
if(s->type == SDYNIMPORT)
adduint32(d, 0);
else
addaddr(d, s);
/* size */
adduint32(d, 0);
/* type */
t = STB_GLOBAL << 4;
if(s->dynexport && s->type == STEXT)
t |= STT_FUNC;
else
t |= STT_OBJECT;
adduint8(d, t);
adduint8(d, 0);
/* shndx */
if(!s->dynexport && s->dynimpname != nil)
adduint16(d, SHN_UNDEF);
else {
switch(s->type) {
default:
case STEXT:
t = 11;
break;
case SRODATA:
t = 12;
break;
case SDATA:
t = 13;
break;
case SBSS:
t = 14;
break;
}
adduint16(d, t);
}
} else {
diag("adddynsym: unsupported binary format");
}
}
void
adddynlib(char *lib)
{
Sym *s;
if(!needlib(lib))
return;
if(iself) {
s = lookup(".dynstr", 0);
if(s->size == 0)
addstring(s, "");
elfwritedynent(lookup(".dynamic", 0), DT_NEEDED, addstring(s, lib));
} else {
diag("adddynlib: unsupported binary format");
}
}
void
doelf(void)
{
Sym *s, *shstrtab, *dynstr;
if(!iself)
return;
/* predefine strings we need for section headers */
shstrtab = lookup(".shstrtab", 0);
shstrtab->type = SELFROSECT;
shstrtab->reachable = 1;
elfstr[ElfStrEmpty] = addstring(shstrtab, "");
elfstr[ElfStrText] = addstring(shstrtab, ".text");
elfstr[ElfStrNoPtrData] = addstring(shstrtab, ".noptrdata");
elfstr[ElfStrData] = addstring(shstrtab, ".data");
elfstr[ElfStrBss] = addstring(shstrtab, ".bss");
elfstr[ElfStrNoPtrBss] = addstring(shstrtab, ".noptrbss");
if(HEADTYPE == Hnetbsd)
elfstr[ElfStrNoteNetbsdIdent] = addstring(shstrtab, ".note.netbsd.ident");
if(HEADTYPE == Hopenbsd)
elfstr[ElfStrNoteOpenbsdIdent] = addstring(shstrtab, ".note.openbsd.ident");
addstring(shstrtab, ".rodata");
addstring(shstrtab, ".gcdata");
addstring(shstrtab, ".gcbss");
addstring(shstrtab, ".gosymtab");
addstring(shstrtab, ".gopclntab");
if(!debug['s']) {
elfstr[ElfStrSymtab] = addstring(shstrtab, ".symtab");
elfstr[ElfStrStrtab] = addstring(shstrtab, ".strtab");
dwarfaddshstrings(shstrtab);
}
elfstr[ElfStrShstrtab] = addstring(shstrtab, ".shstrtab");
if(!debug['d']) { /* -d suppresses dynamic loader format */
elfstr[ElfStrInterp] = addstring(shstrtab, ".interp");
elfstr[ElfStrHash] = addstring(shstrtab, ".hash");
elfstr[ElfStrGot] = addstring(shstrtab, ".got");
elfstr[ElfStrGotPlt] = addstring(shstrtab, ".got.plt");
elfstr[ElfStrDynamic] = addstring(shstrtab, ".dynamic");
elfstr[ElfStrDynsym] = addstring(shstrtab, ".dynsym");
elfstr[ElfStrDynstr] = addstring(shstrtab, ".dynstr");
elfstr[ElfStrRel] = addstring(shstrtab, ".rel");
elfstr[ElfStrRelPlt] = addstring(shstrtab, ".rel.plt");
elfstr[ElfStrPlt] = addstring(shstrtab, ".plt");
elfstr[ElfStrGnuVersion] = addstring(shstrtab, ".gnu.version");
elfstr[ElfStrGnuVersionR] = addstring(shstrtab, ".gnu.version_r");
/* dynamic symbol table - first entry all zeros */
s = lookup(".dynsym", 0);
s->type = SELFROSECT;
s->reachable = 1;
s->size += ELF32SYMSIZE;
/* dynamic string table */
s = lookup(".dynstr", 0);
s->reachable = 1;
s->type = SELFROSECT;
if(s->size == 0)
addstring(s, "");
dynstr = s;
/* relocation table */
s = lookup(".rel", 0);
s->reachable = 1;
s->type = SELFROSECT;
/* global offset table */
s = lookup(".got", 0);
s->reachable = 1;
s->type = SELFSECT; // writable
/* hash */
s = lookup(".hash", 0);
s->reachable = 1;
s->type = SELFROSECT;
/* got.plt */
s = lookup(".got.plt", 0);
s->reachable = 1;
s->type = SELFSECT; // writable
s = lookup(".plt", 0);
s->reachable = 1;
s->type = SELFROSECT;
s = lookup(".rel.plt", 0);
s->reachable = 1;
s->type = SELFROSECT;
s = lookup(".gnu.version", 0);
s->reachable = 1;
s->type = SELFROSECT;
s = lookup(".gnu.version_r", 0);
s->reachable = 1;
s->type = SELFROSECT;
elfsetupplt();
/* define dynamic elf table */
s = lookup(".dynamic", 0);
s->reachable = 1;
s->type = SELFSECT; // writable
/*
* .dynamic table
*/
elfwritedynentsym(s, DT_HASH, lookup(".hash", 0));
elfwritedynentsym(s, DT_SYMTAB, lookup(".dynsym", 0));
elfwritedynent(s, DT_SYMENT, ELF32SYMSIZE);
elfwritedynentsym(s, DT_STRTAB, lookup(".dynstr", 0));
elfwritedynentsymsize(s, DT_STRSZ, lookup(".dynstr", 0));
elfwritedynentsym(s, DT_REL, lookup(".rel", 0));
elfwritedynentsymsize(s, DT_RELSZ, lookup(".rel", 0));
elfwritedynent(s, DT_RELENT, ELF32RELSIZE);
if(rpath)
elfwritedynent(s, DT_RUNPATH, addstring(dynstr, rpath));
elfwritedynentsym(s, DT_PLTGOT, lookup(".got.plt", 0));
elfwritedynent(s, DT_PLTREL, DT_REL);
elfwritedynentsymsize(s, DT_PLTRELSZ, lookup(".rel.plt", 0));
elfwritedynentsym(s, DT_JMPREL, lookup(".rel.plt", 0));
elfwritedynent(s, DT_DEBUG, 0);
// elfdynhash will finish it
}
}
vlong
datoff(vlong addr)
{
if(addr >= segdata.vaddr)
return addr - segdata.vaddr + segdata.fileoff;
if(addr >= segtext.vaddr)
return addr - segtext.vaddr + segtext.fileoff;
diag("datoff %#x", addr);
return 0;
}
void
shsym(Elf64_Shdr *sh, Sym *s)
{
vlong addr;
addr = symaddr(s);
if(sh->flags&SHF_ALLOC)
sh->addr = addr;
sh->off = datoff(addr);
sh->size = s->size;
}
void
phsh(Elf64_Phdr *ph, Elf64_Shdr *sh)
{
ph->vaddr = sh->addr;
ph->paddr = ph->vaddr;
ph->off = sh->off;
ph->filesz = sh->size;
ph->memsz = sh->size;
ph->align = sh->addralign;
}
void
asmb(void)
{
int32 t;
int a, dynsym;
uint32 fo, symo, startva, resoff;
ElfEhdr *eh;
ElfPhdr *ph, *pph;
ElfShdr *sh;
Section *sect;
int o;
if(debug['v'])
Bprint(&bso, "%5.2f asmb\n", cputime());
Bflush(&bso);
sect = segtext.sect;
cseek(sect->vaddr - segtext.vaddr + segtext.fileoff);
codeblk(sect->vaddr, sect->len);
/* output read-only data in text segment (rodata, gosymtab, pclntab, ...) */
for(sect = sect->next; sect != nil; sect = sect->next) {
cseek(sect->vaddr - segtext.vaddr + segtext.fileoff);
datblk(sect->vaddr, sect->len);
}
if(debug['v'])
Bprint(&bso, "%5.2f datblk\n", cputime());
Bflush(&bso);
cseek(segdata.fileoff);
datblk(segdata.vaddr, segdata.filelen);
if(iself) {
/* index of elf text section; needed by asmelfsym, double-checked below */
/* !debug['d'] causes extra sections before the .text section */
elftextsh = 2;
if(!debug['d']) {
elftextsh += 9;
if(elfverneed)
elftextsh += 2;
}
if(HEADTYPE == Hnetbsd || HEADTYPE == Hopenbsd)
elftextsh += 1;
}
/* output symbol table */
symsize = 0;
lcsize = 0;
symo = 0;
if(!debug['s']) {
// TODO: rationalize
if(debug['v'])
Bprint(&bso, "%5.2f sym\n", cputime());
Bflush(&bso);
switch(HEADTYPE) {
default:
if(iself)
goto ElfSym;
case Hnoheader:
case Hrisc:
case Hixp1200:
case Hipaq:
debug['s'] = 1;
break;
case Hplan9x32:
symo = HEADR+segtext.len+segdata.filelen;
break;
case Hnetbsd:
symo = rnd(segdata.filelen, 4096);
break;
ElfSym:
symo = rnd(HEADR+segtext.filelen, INITRND)+segdata.filelen;
symo = rnd(symo, INITRND);
break;
}
cseek(symo);
if(iself) {
if(debug['v'])
Bprint(&bso, "%5.2f elfsym\n", cputime());
asmelfsym();
cflush();
cwrite(elfstrdat, elfstrsize);
if(debug['v'])
Bprint(&bso, "%5.2f dwarf\n", cputime());
dwarfemitdebugsections();
}
cflush();
}
cursym = nil;
if(debug['v'])
Bprint(&bso, "%5.2f header\n", cputime());
Bflush(&bso);
cseek(0L);
switch(HEADTYPE) {
case Hnoheader: /* no header */
break;
case Hrisc: /* aif for risc os */
lputl(0xe1a00000); /* NOP - decompress code */
lputl(0xe1a00000); /* NOP - relocation code */
lputl(0xeb000000 + 12); /* BL - zero init code */
lputl(0xeb000000 +
(entryvalue()
- INITTEXT
+ HEADR
- 12
- 8) / 4); /* BL - entry code */
lputl(0xef000011); /* SWI - exit code */
lputl(textsize+HEADR); /* text size */
lputl(segdata.filelen); /* data size */
lputl(0); /* sym size */
lputl(segdata.len - segdata.filelen); /* bss size */
lputl(0); /* sym type */
lputl(INITTEXT-HEADR); /* text addr */
lputl(0); /* workspace - ignored */
lputl(32); /* addr mode / data addr flag */
lputl(0); /* data addr */
for(t=0; t<2; t++)
lputl(0); /* reserved */
for(t=0; t<15; t++)
lputl(0xe1a00000); /* NOP - zero init code */
lputl(0xe1a0f00e); /* B (R14) - zero init return */
break;
case Hplan9x32: /* plan 9 */
lput(0x647); /* magic */
lput(textsize); /* sizes */
lput(segdata.filelen);
lput(segdata.len - segdata.filelen);
lput(symsize); /* nsyms */
lput(entryvalue()); /* va of entry */
lput(0L);
lput(lcsize);
break;
case Hnetbsd: /* boot for NetBSD */
lput((143<<16)|0413); /* magic */
lputl(rnd(HEADR+textsize, 4096));
lputl(rnd(segdata.filelen, 4096));
lputl(segdata.len - segdata.filelen);
lputl(symsize); /* nsyms */
lputl(entryvalue()); /* va of entry */
lputl(0L);
lputl(0L);
break;
case Hixp1200: /* boot for IXP1200 */
break;
case Hipaq: /* boot for ipaq */
lputl(0xe3300000); /* nop */
lputl(0xe3300000); /* nop */
lputl(0xe3300000); /* nop */
lputl(0xe3300000); /* nop */
break;
case Hlinux:
/* elf arm */
eh = getElfEhdr();
fo = HEADR;
startva = INITTEXT - fo; /* va of byte 0 of file */
resoff = ELFRESERVE;
/* This null SHdr must appear before all others */
newElfShdr(elfstr[ElfStrEmpty]);
/* program header info */
pph = newElfPhdr();
pph->type = PT_PHDR;
pph->flags = PF_R + PF_X;
pph->off = eh->ehsize;
pph->vaddr = INITTEXT - HEADR + pph->off;
pph->paddr = INITTEXT - HEADR + pph->off;
pph->align = INITRND;
/*
* PHDR must be in a loaded segment. Adjust the text
* segment boundaries downwards to include it.
*/
o = segtext.vaddr - pph->vaddr;
segtext.vaddr -= o;
segtext.len += o;
o = segtext.fileoff - pph->off;
segtext.fileoff -= o;
segtext.filelen += o;
if(!debug['d']) {
/* interpreter for dynamic linking */
sh = newElfShdr(elfstr[ElfStrInterp]);
sh->type = SHT_PROGBITS;
sh->flags = SHF_ALLOC;
sh->addralign = 1;
if(interpreter == nil)
interpreter = linuxdynld;
resoff -= elfinterp(sh, startva, resoff, interpreter);
ph = newElfPhdr();
ph->type = PT_INTERP;
ph->flags = PF_R;
phsh(ph, sh);
}
if(HEADTYPE == Hnetbsd || HEADTYPE == Hopenbsd) {
sh = nil;
switch(HEADTYPE) {
case Hnetbsd:
sh = newElfShdr(elfstr[ElfStrNoteNetbsdIdent]);
resoff -= elfnetbsdsig(sh, startva, resoff);
break;
case Hopenbsd:
sh = newElfShdr(elfstr[ElfStrNoteOpenbsdIdent]);
resoff -= elfopenbsdsig(sh, startva, resoff);
break;
}
ph = newElfPhdr();
ph->type = PT_NOTE;
ph->flags = PF_R;
phsh(ph, sh);
}
elfphload(&segtext);
elfphload(&segdata);
/* Dynamic linking sections */
if(!debug['d']) { /* -d suppresses dynamic loader format */
/* S headers for dynamic linking */
// ARM ELF needs .plt to be placed before .got
sh = newElfShdr(elfstr[ElfStrPlt]);
sh->type = SHT_PROGBITS;
sh->flags = SHF_ALLOC+SHF_EXECINSTR;
sh->entsize = 4;
sh->addralign = 4;
shsym(sh, lookup(".plt", 0));
sh = newElfShdr(elfstr[ElfStrGotPlt]);
sh->type = SHT_PROGBITS;
sh->flags = SHF_ALLOC+SHF_WRITE;
sh->entsize = 4;
sh->addralign = 4;
shsym(sh, lookup(".got.plt", 0));
sh = newElfShdr(elfstr[ElfStrGot]);
sh->type = SHT_PROGBITS;
sh->flags = SHF_ALLOC+SHF_WRITE;
sh->entsize = 4;
sh->addralign = 4;
shsym(sh, lookup(".got", 0));
dynsym = eh->shnum;
sh = newElfShdr(elfstr[ElfStrDynsym]);
sh->type = SHT_DYNSYM;
sh->flags = SHF_ALLOC;
sh->entsize = ELF32SYMSIZE;
sh->addralign = 4;
sh->link = dynsym+1; // dynstr
// sh->info = index of first non-local symbol (number of local symbols)
shsym(sh, lookup(".dynsym", 0));
sh = newElfShdr(elfstr[ElfStrDynstr]);
sh->type = SHT_STRTAB;
sh->flags = SHF_ALLOC;
sh->addralign = 1;
shsym(sh, lookup(".dynstr", 0));
if(elfverneed) {
sh = newElfShdr(elfstr[ElfStrGnuVersion]);
sh->type = SHT_GNU_VERSYM;
sh->flags = SHF_ALLOC;
sh->addralign = 2;
sh->link = dynsym;
sh->entsize = 2;
shsym(sh, lookup(".gnu.version", 0));
sh = newElfShdr(elfstr[ElfStrGnuVersionR]);
sh->type = SHT_GNU_VERNEED;
sh->flags = SHF_ALLOC;
sh->addralign = 4;
sh->info = elfverneed;
sh->link = dynsym+1; // dynstr
shsym(sh, lookup(".gnu.version_r", 0));
}
sh = newElfShdr(elfstr[ElfStrHash]);
sh->type = SHT_HASH;
sh->flags = SHF_ALLOC;
sh->entsize = 4;
sh->addralign = 4;
sh->link = dynsym;
shsym(sh, lookup(".hash", 0));
sh = newElfShdr(elfstr[ElfStrRel]);
sh->type = SHT_REL;
sh->flags = SHF_ALLOC;
sh->entsize = ELF32RELSIZE;
sh->addralign = 4;
sh->link = dynsym;
shsym(sh, lookup(".rel", 0));
/* sh and PT_DYNAMIC for .dynamic section */
sh = newElfShdr(elfstr[ElfStrDynamic]);
sh->type = SHT_DYNAMIC;
sh->flags = SHF_ALLOC+SHF_WRITE;
sh->entsize = 8;
sh->addralign = 4;
sh->link = dynsym+1; // dynstr
shsym(sh, lookup(".dynamic", 0));
ph = newElfPhdr();
ph->type = PT_DYNAMIC;
ph->flags = PF_R + PF_W;
phsh(ph, sh);
// .tbss (optional) and TLS phdr
if(tlsoffset != 0) {
ph = newElfPhdr();
ph->type = PT_TLS;
ph->flags = PF_R;
ph->memsz = -tlsoffset;
ph->align = 4;
}
}
ph = newElfPhdr();
ph->type = PT_GNU_STACK;
ph->flags = PF_W+PF_R;
ph->align = 4;
ph = newElfPhdr();
ph->type = PT_PAX_FLAGS;
ph->flags = 0x2a00; // mprotect, randexec, emutramp disabled
ph->align = 4;
sh = newElfShstrtab(elfstr[ElfStrShstrtab]);
sh->type = SHT_STRTAB;
sh->addralign = 1;
shsym(sh, lookup(".shstrtab", 0));
if(elftextsh != eh->shnum)
diag("elftextsh = %d, want %d", elftextsh, eh->shnum);
for(sect=segtext.sect; sect!=nil; sect=sect->next)
elfshbits(sect);
for(sect=segdata.sect; sect!=nil; sect=sect->next)
elfshbits(sect);
if(!debug['s']) {
sh = newElfShdr(elfstr[ElfStrSymtab]);
sh->type = SHT_SYMTAB;
sh->off = symo;
sh->size = symsize;
sh->addralign = 4;
sh->entsize = 16;
sh->link = eh->shnum; // link to strtab
sh = newElfShdr(elfstr[ElfStrStrtab]);
sh->type = SHT_STRTAB;
sh->off = symo+symsize;
sh->size = elfstrsize;
sh->addralign = 1;
dwarfaddelfheaders();
}
/* Main header */
eh->ident[EI_MAG0] = '\177';
eh->ident[EI_MAG1] = 'E';
eh->ident[EI_MAG2] = 'L';
eh->ident[EI_MAG3] = 'F';
eh->ident[EI_CLASS] = ELFCLASS32;
eh->ident[EI_DATA] = ELFDATA2LSB;
eh->ident[EI_VERSION] = EV_CURRENT;
eh->type = ET_EXEC;
eh->machine = EM_ARM;
eh->version = EV_CURRENT;
eh->entry = entryvalue();
if(pph != nil) {
pph->filesz = eh->phnum * eh->phentsize;
pph->memsz = pph->filesz;
}
cseek(0);
a = 0;
a += elfwritehdr();
a += elfwritephdrs();
a += elfwriteshdrs();
a += elfwriteinterp(elfstr[ElfStrInterp]);
if(HEADTYPE == Hnetbsd)
a += elfwritenetbsdsig(elfstr[ElfStrNoteNetbsdIdent]);
if(HEADTYPE == Hopenbsd)
a += elfwriteopenbsdsig(elfstr[ElfStrNoteOpenbsdIdent]);
if(a > ELFRESERVE)
diag("ELFRESERVE too small: %d > %d", a, ELFRESERVE);
break;
}
cflush();
if(debug['c']){
print("textsize=%d\n", textsize);
print("datsize=%ulld\n", segdata.filelen);
print("bsssize=%ulld\n", segdata.len - segdata.filelen);
print("symsize=%d\n", symsize);
print("lcsize=%d\n", lcsize);
print("total=%lld\n", textsize+segdata.len+symsize+lcsize);
}
}
/*
void
cput(int32 c)
{
*cbp++ = c;
if(--cbc <= 0)
cflush();
}
*/
void
wput(int32 l)
{
cbp[0] = l>>8;
cbp[1] = l;
cbp += 2;
cbc -= 2;
if(cbc <= 0)
cflush();
}
void
hput(int32 l)
{
cbp[0] = l>>8;
cbp[1] = l;
cbp += 2;
cbc -= 2;
if(cbc <= 0)
cflush();
}
void
lput(int32 l)
{
cbp[0] = l>>24;
cbp[1] = l>>16;
cbp[2] = l>>8;
cbp[3] = l;
cbp += 4;
cbc -= 4;
if(cbc <= 0)
cflush();
}
void
nopstat(char *f, Count *c)
{
if(c->outof)
Bprint(&bso, "%s delay %d/%d (%.2f)\n", f,
c->outof - c->count, c->outof,
(double)(c->outof - c->count)/c->outof);
}
void
asmout(Prog *p, Optab *o, int32 *out)
{
int32 o1, o2, o3, o4, o5, o6, v;
int r, rf, rt, rt2;
Reloc *rel;
PP = p;
o1 = 0;
o2 = 0;
o3 = 0;
o4 = 0;
o5 = 0;
o6 = 0;
armsize += o->size;
if(debug['P']) print("%ux: %P type %d\n", (uint32)(p->pc), p, o->type);
switch(o->type) {
default:
diag("unknown asm %d", o->type);
prasm(p);
break;
case 0: /* pseudo ops */
if(debug['G']) print("%ux: %s: arm %d\n", (uint32)(p->pc), p->from.sym->name, p->from.sym->fnptr);
break;
case 1: /* op R,[R],R */
o1 = oprrr(p->as, p->scond);
rf = p->from.reg;
rt = p->to.reg;
r = p->reg;
if(p->to.type == D_NONE)
rt = 0;
if(p->as == AMOVW || p->as == AMVN)
r = 0;
else
if(r == NREG)
r = rt;
o1 |= rf | (r<<16) | (rt<<12);
break;
case 2: /* movbu $I,[R],R */
aclass(&p->from);
o1 = oprrr(p->as, p->scond);
o1 |= immrot(instoffset);
rt = p->to.reg;
r = p->reg;
if(p->to.type == D_NONE)
rt = 0;
if(p->as == AMOVW || p->as == AMVN)
r = 0;
else if(r == NREG)
r = rt;
o1 |= (r<<16) | (rt<<12);
break;
case 3: /* add R<<[IR],[R],R */
mov:
aclass(&p->from);
o1 = oprrr(p->as, p->scond);
o1 |= p->from.offset;
rt = p->to.reg;
r = p->reg;
if(p->to.type == D_NONE)
rt = 0;
if(p->as == AMOVW || p->as == AMVN)
r = 0;
else if(r == NREG)
r = rt;
o1 |= (r<<16) | (rt<<12);
break;
case 4: /* add $I,[R],R */
aclass(&p->from);
o1 = oprrr(AADD, p->scond);
o1 |= immrot(instoffset);
r = p->from.reg;
if(r == NREG)
r = o->param;
o1 |= r << 16;
o1 |= p->to.reg << 12;
break;
case 5: /* bra s */
v = -8;
if(p->cond != P)
v = (p->cond->pc - pc) - 8;
o1 = opbra(p->as, p->scond);
o1 |= (v >> 2) & 0xffffff;
break;
case 6: /* b ,O(R) -> add $O,R,PC */
aclass(&p->to);
o1 = oprrr(AADD, p->scond);
o1 |= immrot(instoffset);
o1 |= p->to.reg << 16;
o1 |= REGPC << 12;
break;
case 7: /* bl ,O(R) -> mov PC,link; add $O,R,PC */
aclass(&p->to);
o1 = oprrr(AADD, p->scond);
o1 |= immrot(0);
o1 |= REGPC << 16;
o1 |= REGLINK << 12;
o2 = oprrr(AADD, p->scond);
o2 |= immrot(instoffset);
o2 |= p->to.reg << 16;
o2 |= REGPC << 12;
break;
case 8: /* sll $c,[R],R -> mov (R<<$c),R */
aclass(&p->from);
o1 = oprrr(p->as, p->scond);
r = p->reg;
if(r == NREG)
r = p->to.reg;
o1 |= r;
o1 |= (instoffset&31) << 7;
o1 |= p->to.reg << 12;
break;
case 9: /* sll R,[R],R -> mov (R<<R),R */
o1 = oprrr(p->as, p->scond);
r = p->reg;
if(r == NREG)
r = p->to.reg;
o1 |= r;
o1 |= (p->from.reg << 8) | (1<<4);
o1 |= p->to.reg << 12;
break;
case 10: /* swi [$con] */
o1 = oprrr(p->as, p->scond);
if(p->to.type != D_NONE) {
aclass(&p->to);
o1 |= instoffset & 0xffffff;
}
break;
case 11: /* word */
aclass(&p->to);
o1 = instoffset;
if(p->to.sym != S) {
rel = addrel(cursym);
rel->off = pc - cursym->value;
rel->siz = 4;
rel->type = D_ADDR;
rel->sym = p->to.sym;
rel->add = p->to.offset;
o1 = 0;
}
break;
case 12: /* movw $lcon, reg */
o1 = omvl(p, &p->from, p->to.reg);
break;
case 13: /* op $lcon, [R], R */
o1 = omvl(p, &p->from, REGTMP);
if(!o1)
break;
o2 = oprrr(p->as, p->scond);
o2 |= REGTMP;
r = p->reg;
if(p->as == AMOVW || p->as == AMVN)
r = 0;
else if(r == NREG)
r = p->to.reg;
o2 |= r << 16;
if(p->to.type != D_NONE)
o2 |= p->to.reg << 12;
break;
case 14: /* movb/movbu/movh/movhu R,R */
o1 = oprrr(ASLL, p->scond);
if(p->as == AMOVBU || p->as == AMOVHU)
o2 = oprrr(ASRL, p->scond);
else
o2 = oprrr(ASRA, p->scond);
r = p->to.reg;
o1 |= (p->from.reg)|(r<<12);
o2 |= (r)|(r<<12);
if(p->as == AMOVB || p->as == AMOVBU) {
o1 |= (24<<7);
o2 |= (24<<7);
} else {
o1 |= (16<<7);
o2 |= (16<<7);
}
break;
case 15: /* mul r,[r,]r */
o1 = oprrr(p->as, p->scond);
rf = p->from.reg;
rt = p->to.reg;
r = p->reg;
if(r == NREG)
r = rt;
if(rt == r) {
r = rf;
rf = rt;
}
if(0)
if(rt == r || rf == REGPC || r == REGPC || rt == REGPC) {
diag("bad registers in MUL");
prasm(p);
}
o1 |= (rf<<8) | r | (rt<<16);
break;
case 16: /* div r,[r,]r */
o1 = 0xf << 28;
o2 = 0;
break;
case 17:
o1 = oprrr(p->as, p->scond);
rf = p->from.reg;
rt = p->to.reg;
rt2 = p->to.offset;
r = p->reg;
o1 |= (rf<<8) | r | (rt<<16) | (rt2<<12);
break;
case 20: /* mov/movb/movbu R,O(R) */
aclass(&p->to);
r = p->to.reg;
if(r == NREG)
r = o->param;
o1 = osr(p->as, p->from.reg, instoffset, r, p->scond);
break;
case 21: /* mov/movbu O(R),R -> lr */
aclass(&p->from);
r = p->from.reg;
if(r == NREG)
r = o->param;
o1 = olr(instoffset, r, p->to.reg, p->scond);
if(p->as != AMOVW)
o1 |= 1<<22;
break;
case 30: /* mov/movb/movbu R,L(R) */
o1 = omvl(p, &p->to, REGTMP);
if(!o1)
break;
r = p->to.reg;
if(r == NREG)
r = o->param;
o2 = osrr(p->from.reg, REGTMP,r, p->scond);
if(p->as != AMOVW)
o2 |= 1<<22;
break;
case 31: /* mov/movbu L(R),R -> lr[b] */
o1 = omvl(p, &p->from, REGTMP);
if(!o1)
break;
r = p->from.reg;
if(r == NREG)
r = o->param;
o2 = olrr(REGTMP,r, p->to.reg, p->scond);
if(p->as == AMOVBU || p->as == AMOVB)
o2 |= 1<<22;
break;
case 34: /* mov $lacon,R */
o1 = omvl(p, &p->from, REGTMP);
if(!o1)
break;
o2 = oprrr(AADD, p->scond);
o2 |= REGTMP;
r = p->from.reg;
if(r == NREG)
r = o->param;
o2 |= r << 16;
if(p->to.type != D_NONE)
o2 |= p->to.reg << 12;
break;
case 35: /* mov PSR,R */
o1 = (2<<23) | (0xf<<16) | (0<<0);
o1 |= (p->scond & C_SCOND) << 28;
o1 |= (p->from.reg & 1) << 22;
o1 |= p->to.reg << 12;
break;
case 36: /* mov R,PSR */
o1 = (2<<23) | (0x29f<<12) | (0<<4);
if(p->scond & C_FBIT)
o1 ^= 0x010 << 12;
o1 |= (p->scond & C_SCOND) << 28;
o1 |= (p->to.reg & 1) << 22;
o1 |= p->from.reg << 0;
break;
case 37: /* mov $con,PSR */
aclass(&p->from);
o1 = (2<<23) | (0x29f<<12) | (0<<4);
if(p->scond & C_FBIT)
o1 ^= 0x010 << 12;
o1 |= (p->scond & C_SCOND) << 28;
o1 |= immrot(instoffset);
o1 |= (p->to.reg & 1) << 22;
o1 |= p->from.reg << 0;
break;
case 38: /* movm $con,oreg -> stm */
o1 = (0x4 << 25);
o1 |= p->from.offset & 0xffff;
o1 |= p->to.reg << 16;
aclass(&p->to);
goto movm;
case 39: /* movm oreg,$con -> ldm */
o1 = (0x4 << 25) | (1 << 20);
o1 |= p->to.offset & 0xffff;
o1 |= p->from.reg << 16;
aclass(&p->from);
movm:
if(instoffset != 0)
diag("offset must be zero in MOVM");
o1 |= (p->scond & C_SCOND) << 28;
if(p->scond & C_PBIT)
o1 |= 1 << 24;
if(p->scond & C_UBIT)
o1 |= 1 << 23;
if(p->scond & C_SBIT)
o1 |= 1 << 22;
if(p->scond & C_WBIT)
o1 |= 1 << 21;
break;
case 40: /* swp oreg,reg,reg */
aclass(&p->from);
if(instoffset != 0)
diag("offset must be zero in SWP");
o1 = (0x2<<23) | (0x9<<4);
if(p->as != ASWPW)
o1 |= 1 << 22;
o1 |= p->from.reg << 16;
o1 |= p->reg << 0;
o1 |= p->to.reg << 12;
o1 |= (p->scond & C_SCOND) << 28;
break;
case 41: /* rfe -> movm.s.w.u 0(r13),[r15] */
o1 = 0xe8fd8000;
break;
case 50: /* floating point store */
v = regoff(&p->to);
r = p->to.reg;
if(r == NREG)
r = o->param;
o1 = ofsr(p->as, p->from.reg, v, r, p->scond, p);
break;
case 51: /* floating point load */
v = regoff(&p->from);
r = p->from.reg;
if(r == NREG)
r = o->param;
o1 = ofsr(p->as, p->to.reg, v, r, p->scond, p) | (1<<20);
break;
case 52: /* floating point store, int32 offset UGLY */
o1 = omvl(p, &p->to, REGTMP);
if(!o1)
break;
r = p->to.reg;
if(r == NREG)
r = o->param;
o2 = oprrr(AADD, p->scond) | (REGTMP << 12) | (REGTMP << 16) | r;
o3 = ofsr(p->as, p->from.reg, 0, REGTMP, p->scond, p);
break;
case 53: /* floating point load, int32 offset UGLY */
o1 = omvl(p, &p->from, REGTMP);
if(!o1)
break;
r = p->from.reg;
if(r == NREG)
r = o->param;
o2 = oprrr(AADD, p->scond) | (REGTMP << 12) | (REGTMP << 16) | r;
o3 = ofsr(p->as, p->to.reg, 0, REGTMP, p->scond, p) | (1<<20);
break;
case 54: /* floating point arith */
o1 = oprrr(p->as, p->scond);
rf = p->from.reg;
rt = p->to.reg;
r = p->reg;
if(r == NREG) {
r = rt;
if(p->as == AMOVF || p->as == AMOVD || p->as == ASQRTF || p->as == ASQRTD || p->as == AABSF || p->as == AABSD)
r = 0;
}
o1 |= rf | (r<<16) | (rt<<12);
break;
case 56: /* move to FP[CS]R */
o1 = ((p->scond & C_SCOND) << 28) | (0xe << 24) | (1<<8) | (1<<4);
o1 |= ((p->to.reg+1)<<21) | (p->from.reg << 12);
break;
case 57: /* move from FP[CS]R */
o1 = ((p->scond & C_SCOND) << 28) | (0xe << 24) | (1<<8) | (1<<4);
o1 |= ((p->from.reg+1)<<21) | (p->to.reg<<12) | (1<<20);
break;
case 58: /* movbu R,R */
o1 = oprrr(AAND, p->scond);
o1 |= immrot(0xff);
rt = p->to.reg;
r = p->from.reg;
if(p->to.type == D_NONE)
rt = 0;
if(r == NREG)
r = rt;
o1 |= (r<<16) | (rt<<12);
break;
case 59: /* movw/bu R<<I(R),R -> ldr indexed */
if(p->from.reg == NREG) {
if(p->as != AMOVW)
diag("byte MOV from shifter operand");
goto mov;
}
if(p->from.offset&(1<<4))
diag("bad shift in LDR");
o1 = olrr(p->from.offset, p->from.reg, p->to.reg, p->scond);
if(p->as == AMOVBU)
o1 |= 1<<22;
break;
case 60: /* movb R(R),R -> ldrsb indexed */
if(p->from.reg == NREG) {
diag("byte MOV from shifter operand");
goto mov;
}
if(p->from.offset&(~0xf))
diag("bad shift in LDRSB");
o1 = olhrr(p->from.offset, p->from.reg, p->to.reg, p->scond);
o1 ^= (1<<5)|(1<<6);
break;
case 61: /* movw/b/bu R,R<<[IR](R) -> str indexed */
if(p->to.reg == NREG)
diag("MOV to shifter operand");
o1 = osrr(p->from.reg, p->to.offset, p->to.reg, p->scond);
if(p->as == AMOVB || p->as == AMOVBU)
o1 |= 1<<22;
break;
case 62: /* case R -> movw R<<2(PC),PC */
o1 = olrr(p->from.reg, REGPC, REGPC, p->scond);
o1 |= 2<<7;
break;
case 63: /* bcase */
if(p->cond != P)
o1 = p->cond->pc;
break;
/* reloc ops */
case 64: /* mov/movb/movbu R,addr */
o1 = omvl(p, &p->to, REGTMP);
if(!o1)
break;
o2 = osr(p->as, p->from.reg, 0, REGTMP, p->scond);
break;
case 65: /* mov/movbu addr,R */
o1 = omvl(p, &p->from, REGTMP);
if(!o1)
break;
o2 = olr(0, REGTMP, p->to.reg, p->scond);
if(p->as == AMOVBU || p->as == AMOVB)
o2 |= 1<<22;
break;
case 68: /* floating point store -> ADDR */
o1 = omvl(p, &p->to, REGTMP);
if(!o1)
break;
o2 = ofsr(p->as, p->from.reg, 0, REGTMP, p->scond, p);
break;
case 69: /* floating point load <- ADDR */
o1 = omvl(p, &p->from, REGTMP);
if(!o1)
break;
o2 = ofsr(p->as, p->to.reg, 0, REGTMP, p->scond, p) | (1<<20);
break;
/* ArmV4 ops: */
case 70: /* movh/movhu R,O(R) -> strh */
aclass(&p->to);
r = p->to.reg;
if(r == NREG)
r = o->param;
o1 = oshr(p->from.reg, instoffset, r, p->scond);
break;
case 71: /* movb/movh/movhu O(R),R -> ldrsb/ldrsh/ldrh */
aclass(&p->from);
r = p->from.reg;
if(r == NREG)
r = o->param;
o1 = olhr(instoffset, r, p->to.reg, p->scond);
if(p->as == AMOVB)
o1 ^= (1<<5)|(1<<6);
else if(p->as == AMOVH)
o1 ^= (1<<6);
break;
case 72: /* movh/movhu R,L(R) -> strh */
o1 = omvl(p, &p->to, REGTMP);
if(!o1)
break;
r = p->to.reg;
if(r == NREG)
r = o->param;
o2 = oshrr(p->from.reg, REGTMP,r, p->scond);
break;
case 73: /* movb/movh/movhu L(R),R -> ldrsb/ldrsh/ldrh */
o1 = omvl(p, &p->from, REGTMP);
if(!o1)
break;
r = p->from.reg;
if(r == NREG)
r = o->param;
o2 = olhrr(REGTMP, r, p->to.reg, p->scond);
if(p->as == AMOVB)
o2 ^= (1<<5)|(1<<6);
else if(p->as == AMOVH)
o2 ^= (1<<6);
break;
case 74: /* bx $I */
diag("ABX $I");
break;
case 75: /* bx O(R) */
aclass(&p->to);
if(instoffset != 0)
diag("non-zero offset in ABX");
/*
o1 = oprrr(AADD, p->scond) | immrot(0) | (REGPC<<16) | (REGLINK<<12); // mov PC, LR
o2 = ((p->scond&C_SCOND)<<28) | (0x12fff<<8) | (1<<4) | p->to.reg; // BX R
*/
// p->to.reg may be REGLINK
o1 = oprrr(AADD, p->scond);
o1 |= immrot(instoffset);
o1 |= p->to.reg << 16;
o1 |= REGTMP << 12;
o2 = oprrr(AADD, p->scond) | immrot(0) | (REGPC<<16) | (REGLINK<<12); // mov PC, LR
o3 = ((p->scond&C_SCOND)<<28) | (0x12fff<<8) | (1<<4) | REGTMP; // BX Rtmp
break;
case 76: /* bx O(R) when returning from fn*/
diag("ABXRET");
break;
case 77: /* ldrex oreg,reg */
aclass(&p->from);
if(instoffset != 0)
diag("offset must be zero in LDREX");
o1 = (0x19<<20) | (0xf9f);
o1 |= p->from.reg << 16;
o1 |= p->to.reg << 12;
o1 |= (p->scond & C_SCOND) << 28;
break;
case 78: /* strex reg,oreg,reg */
aclass(&p->from);
if(instoffset != 0)
diag("offset must be zero in STREX");
o1 = (0x18<<20) | (0xf90);
o1 |= p->from.reg << 16;
o1 |= p->reg << 0;
o1 |= p->to.reg << 12;
o1 |= (p->scond & C_SCOND) << 28;
break;
case 80: /* fmov zfcon,freg */
if(p->as == AMOVD) {
o1 = 0xeeb00b00; // VMOV imm 64
o2 = oprrr(ASUBD, p->scond);
} else {
o1 = 0x0eb00a00; // VMOV imm 32
o2 = oprrr(ASUBF, p->scond);
}
v = 0x70; // 1.0
r = p->to.reg;
// movf $1.0, r
o1 |= (p->scond & C_SCOND) << 28;
o1 |= r << 12;
o1 |= (v&0xf) << 0;
o1 |= (v&0xf0) << 12;
// subf r,r,r
o2 |= r | (r<<16) | (r<<12);
break;
case 81: /* fmov sfcon,freg */
o1 = 0x0eb00a00; // VMOV imm 32
if(p->as == AMOVD)
o1 = 0xeeb00b00; // VMOV imm 64
o1 |= (p->scond & C_SCOND) << 28;
o1 |= p->to.reg << 12;
v = chipfloat(&p->from.ieee);
o1 |= (v&0xf) << 0;
o1 |= (v&0xf0) << 12;
break;
case 82: /* fcmp freg,freg, */
o1 = oprrr(p->as, p->scond);
o1 |= (p->reg<<12) | (p->from.reg<<0);
o2 = 0x0ef1fa10; // VMRS R15
o2 |= (p->scond & C_SCOND) << 28;
break;
case 83: /* fcmp freg,, */
o1 = oprrr(p->as, p->scond);
o1 |= (p->from.reg<<12) | (1<<16);
o2 = 0x0ef1fa10; // VMRS R15
o2 |= (p->scond & C_SCOND) << 28;
break;
case 84: /* movfw freg,freg - truncate float-to-fix */
o1 = oprrr(p->as, p->scond);
o1 |= (p->from.reg<<0);
o1 |= (p->to.reg<<12);
break;
case 85: /* movwf freg,freg - fix-to-float */
o1 = oprrr(p->as, p->scond);
o1 |= (p->from.reg<<0);
o1 |= (p->to.reg<<12);
break;
case 86: /* movfw freg,reg - truncate float-to-fix */
// macro for movfw freg,FTMP; movw FTMP,reg
o1 = oprrr(p->as, p->scond);
o1 |= (p->from.reg<<0);
o1 |= (FREGTMP<<12);
o2 = oprrr(AMOVFW+AEND, p->scond);
o2 |= (FREGTMP<<16);
o2 |= (p->to.reg<<12);
break;
case 87: /* movwf reg,freg - fix-to-float */
// macro for movw reg,FTMP; movwf FTMP,freg
o1 = oprrr(AMOVWF+AEND, p->scond);
o1 |= (p->from.reg<<12);
o1 |= (FREGTMP<<16);
o2 = oprrr(p->as, p->scond);
o2 |= (FREGTMP<<0);
o2 |= (p->to.reg<<12);
break;
case 88: /* movw reg,freg */
o1 = oprrr(AMOVWF+AEND, p->scond);
o1 |= (p->from.reg<<12);
o1 |= (p->to.reg<<16);
break;
case 89: /* movw freg,reg */
o1 = oprrr(AMOVFW+AEND, p->scond);
o1 |= (p->from.reg<<16);
o1 |= (p->to.reg<<12);
break;
case 90: /* tst reg */
o1 = oprrr(ACMP+AEND, p->scond);
o1 |= p->from.reg<<16;
break;
case 91: /* ldrexd oreg,reg */
aclass(&p->from);
if(instoffset != 0)
diag("offset must be zero in LDREX");
o1 = (0x1b<<20) | (0xf9f);
o1 |= p->from.reg << 16;
o1 |= p->to.reg << 12;
o1 |= (p->scond & C_SCOND) << 28;
break;
case 92: /* strexd reg,oreg,reg */
aclass(&p->from);
if(instoffset != 0)
diag("offset must be zero in STREX");
o1 = (0x1a<<20) | (0xf90);
o1 |= p->from.reg << 16;
o1 |= p->reg << 0;
o1 |= p->to.reg << 12;
o1 |= (p->scond & C_SCOND) << 28;
break;
case 93: /* movb/movh/movhu addr,R -> ldrsb/ldrsh/ldrh */
o1 = omvl(p, &p->from, REGTMP);
if(!o1)
break;
o2 = olhr(0, REGTMP, p->to.reg, p->scond);
if(p->as == AMOVB)
o2 ^= (1<<5)|(1<<6);
else if(p->as == AMOVH)
o2 ^= (1<<6);
break;
case 94: /* movh/movhu R,addr -> strh */
o1 = omvl(p, &p->to, REGTMP);
if(!o1)
break;
o2 = oshr(p->from.reg, 0, REGTMP, p->scond);
break;
case 95: /* PLD off(reg) */
o1 = 0xf5d0f000;
o1 |= p->from.reg << 16;
if(p->from.offset < 0) {
o1 &= ~(1 << 23);
o1 |= (-p->from.offset) & 0xfff;
} else
o1 |= p->from.offset & 0xfff;
break;
case 96: /* UNDEF */
// This is supposed to be something that stops execution.
// It's not supposed to be reached, ever, but if it is, we'd
// like to be able to tell how we got there. Assemble as
// BL $0
v = (0 - pc) - 8;
o1 = opbra(ABL, C_SCOND_NONE);
o1 |= (v >> 2) & 0xffffff;
break;
case 97: /* CLZ Rm, Rd */
o1 = oprrr(p->as, p->scond);
o1 |= p->to.reg << 12;
o1 |= p->from.reg;
break;
case 98: /* MULW{T,B} Rs, Rm, Rd */
o1 = oprrr(p->as, p->scond);
o1 |= p->to.reg << 16;
o1 |= p->from.reg << 8;
o1 |= p->reg;
break;
case 99: /* MULAW{T,B} Rs, Rm, Rn, Rd */
o1 = oprrr(p->as, p->scond);
o1 |= p->to.reg << 12;
o1 |= p->from.reg << 8;
o1 |= p->reg;
o1 |= p->to.offset << 16;
break;
}
out[0] = o1;
out[1] = o2;
out[2] = o3;
out[3] = o4;
out[4] = o5;
out[5] = o6;
return;
#ifdef NOTDEF
v = p->pc;
switch(o->size) {
default:
if(debug['a'])
Bprint(&bso, " %.8ux:\t\t%P\n", v, p);
break;
case 4:
if(debug['a'])
Bprint(&bso, " %.8ux: %.8ux\t%P\n", v, o1, p);
lputl(o1);
break;
case 8:
if(debug['a'])
Bprint(&bso, " %.8ux: %.8ux %.8ux%P\n", v, o1, o2, p);
lputl(o1);
lputl(o2);
break;
case 12:
if(debug['a'])
Bprint(&bso, " %.8ux: %.8ux %.8ux %.8ux%P\n", v, o1, o2, o3, p);
lputl(o1);
lputl(o2);
lputl(o3);
break;
case 16:
if(debug['a'])
Bprint(&bso, " %.8ux: %.8ux %.8ux %.8ux %.8ux%P\n",
v, o1, o2, o3, o4, p);
lputl(o1);
lputl(o2);
lputl(o3);
lputl(o4);
break;
case 20:
if(debug['a'])
Bprint(&bso, " %.8ux: %.8ux %.8ux %.8ux %.8ux %.8ux%P\n",
v, o1, o2, o3, o4, o5, p);
lputl(o1);
lputl(o2);
lputl(o3);
lputl(o4);
lputl(o5);
break;
case 24:
if(debug['a'])
Bprint(&bso, " %.8ux: %.8ux %.8ux %.8ux %.8ux %.8ux %.8ux%P\n",
v, o1, o2, o3, o4, o5, o6, p);
lputl(o1);
lputl(o2);
lputl(o3);
lputl(o4);
lputl(o5);
lputl(o6);
break;
}
#endif
}
int32
oprrr(int a, int sc)
{
int32 o;
o = (sc & C_SCOND) << 28;
if(sc & C_SBIT)
o |= 1 << 20;
if(sc & (C_PBIT|C_WBIT))
diag(".P/.W on dp instruction");
switch(a) {
case AMULU:
case AMUL: return o | (0x0<<21) | (0x9<<4);
case AMULA: return o | (0x1<<21) | (0x9<<4);
case AMULLU: return o | (0x4<<21) | (0x9<<4);
case AMULL: return o | (0x6<<21) | (0x9<<4);
case AMULALU: return o | (0x5<<21) | (0x9<<4);
case AMULAL: return o | (0x7<<21) | (0x9<<4);
case AAND: return o | (0x0<<21);
case AEOR: return o | (0x1<<21);
case ASUB: return o | (0x2<<21);
case ARSB: return o | (0x3<<21);
case AADD: return o | (0x4<<21);
case AADC: return o | (0x5<<21);
case ASBC: return o | (0x6<<21);
case ARSC: return o | (0x7<<21);
case ATST: return o | (0x8<<21) | (1<<20);
case ATEQ: return o | (0x9<<21) | (1<<20);
case ACMP: return o | (0xa<<21) | (1<<20);
case ACMN: return o | (0xb<<21) | (1<<20);
case AORR: return o | (0xc<<21);
case AMOVW: return o | (0xd<<21);
case ABIC: return o | (0xe<<21);
case AMVN: return o | (0xf<<21);
case ASLL: return o | (0xd<<21) | (0<<5);
case ASRL: return o | (0xd<<21) | (1<<5);
case ASRA: return o | (0xd<<21) | (2<<5);
case ASWI: return o | (0xf<<24);
case AADDD: return o | (0xe<<24) | (0x3<<20) | (0xb<<8) | (0<<4);
case AADDF: return o | (0xe<<24) | (0x3<<20) | (0xa<<8) | (0<<4);
case ASUBD: return o | (0xe<<24) | (0x3<<20) | (0xb<<8) | (4<<4);
case ASUBF: return o | (0xe<<24) | (0x3<<20) | (0xa<<8) | (4<<4);
case AMULD: return o | (0xe<<24) | (0x2<<20) | (0xb<<8) | (0<<4);
case AMULF: return o | (0xe<<24) | (0x2<<20) | (0xa<<8) | (0<<4);
case ADIVD: return o | (0xe<<24) | (0x8<<20) | (0xb<<8) | (0<<4);
case ADIVF: return o | (0xe<<24) | (0x8<<20) | (0xa<<8) | (0<<4);
case ASQRTD: return o | (0xe<<24) | (0xb<<20) | (1<<16) | (0xb<<8) | (0xc<<4);
case ASQRTF: return o | (0xe<<24) | (0xb<<20) | (1<<16) | (0xa<<8) | (0xc<<4);
case AABSD: return o | (0xe<<24) | (0xb<<20) | (0<<16) | (0xb<<8) | (0xc<<4);
case AABSF: return o | (0xe<<24) | (0xb<<20) | (0<<16) | (0xa<<8) | (0xc<<4);
case ACMPD: return o | (0xe<<24) | (0xb<<20) | (4<<16) | (0xb<<8) | (0xc<<4);
case ACMPF: return o | (0xe<<24) | (0xb<<20) | (4<<16) | (0xa<<8) | (0xc<<4);
case AMOVF: return o | (0xe<<24) | (0xb<<20) | (0<<16) | (0xa<<8) | (4<<4);
case AMOVD: return o | (0xe<<24) | (0xb<<20) | (0<<16) | (0xb<<8) | (4<<4);
case AMOVDF: return o | (0xe<<24) | (0xb<<20) | (7<<16) | (0xa<<8) | (0xc<<4) |
(1<<8); // dtof
case AMOVFD: return o | (0xe<<24) | (0xb<<20) | (7<<16) | (0xa<<8) | (0xc<<4) |
(0<<8); // dtof
case AMOVWF:
if((sc & C_UBIT) == 0)
o |= 1<<7; /* signed */
return o | (0xe<<24) | (0xb<<20) | (8<<16) | (0xa<<8) | (4<<4) |
(0<<18) | (0<<8); // toint, double
case AMOVWD:
if((sc & C_UBIT) == 0)
o |= 1<<7; /* signed */
return o | (0xe<<24) | (0xb<<20) | (8<<16) | (0xa<<8) | (4<<4) |
(0<<18) | (1<<8); // toint, double
case AMOVFW:
if((sc & C_UBIT) == 0)
o |= 1<<16; /* signed */
return o | (0xe<<24) | (0xb<<20) | (8<<16) | (0xa<<8) | (4<<4) |
(1<<18) | (0<<8) | (1<<7); // toint, double, trunc
case AMOVDW:
if((sc & C_UBIT) == 0)
o |= 1<<16; /* signed */
return o | (0xe<<24) | (0xb<<20) | (8<<16) | (0xa<<8) | (4<<4) |
(1<<18) | (1<<8) | (1<<7); // toint, double, trunc
case AMOVWF+AEND: // copy WtoF
return o | (0xe<<24) | (0x0<<20) | (0xb<<8) | (1<<4);
case AMOVFW+AEND: // copy FtoW
return o | (0xe<<24) | (0x1<<20) | (0xb<<8) | (1<<4);
case ACMP+AEND: // cmp imm
return o | (0x3<<24) | (0x5<<20);
case ACLZ:
// CLZ doesn't support .S
return (o & (0xf<<28)) | (0x16f<<16) | (0xf1<<4);
case AMULWT:
return (o & (0xf<<28)) | (0x12 << 20) | (0xe<<4);
case AMULWB:
return (o & (0xf<<28)) | (0x12 << 20) | (0xa<<4);
case AMULAWT:
return (o & (0xf<<28)) | (0x12 << 20) | (0xc<<4);
case AMULAWB:
return (o & (0xf<<28)) | (0x12 << 20) | (0x8<<4);
}
diag("bad rrr %d", a);
prasm(curp);
return 0;
}
int32
opbra(int a, int sc)
{
if(sc & (C_SBIT|C_PBIT|C_WBIT))
diag(".S/.P/.W on bra instruction");
sc &= C_SCOND;
if(a == ABL)
return (sc<<28)|(0x5<<25)|(0x1<<24);
if(sc != 0xe)
diag(".COND on bcond instruction");
switch(a) {
case ABEQ: return (0x0<<28)|(0x5<<25);
case ABNE: return (0x1<<28)|(0x5<<25);
case ABCS: return (0x2<<28)|(0x5<<25);
case ABHS: return (0x2<<28)|(0x5<<25);
case ABCC: return (0x3<<28)|(0x5<<25);
case ABLO: return (0x3<<28)|(0x5<<25);
case ABMI: return (0x4<<28)|(0x5<<25);
case ABPL: return (0x5<<28)|(0x5<<25);
case ABVS: return (0x6<<28)|(0x5<<25);
case ABVC: return (0x7<<28)|(0x5<<25);
case ABHI: return (0x8<<28)|(0x5<<25);
case ABLS: return (0x9<<28)|(0x5<<25);
case ABGE: return (0xa<<28)|(0x5<<25);
case ABLT: return (0xb<<28)|(0x5<<25);
case ABGT: return (0xc<<28)|(0x5<<25);
case ABLE: return (0xd<<28)|(0x5<<25);
case AB: return (0xe<<28)|(0x5<<25);
}
diag("bad bra %A", a);
prasm(curp);
return 0;
}
int32
olr(int32 v, int b, int r, int sc)
{
int32 o;
if(sc & C_SBIT)
diag(".S on LDR/STR instruction");
o = (sc & C_SCOND) << 28;
if(!(sc & C_PBIT))
o |= 1 << 24;
if(!(sc & C_UBIT))
o |= 1 << 23;
if(sc & C_WBIT)
o |= 1 << 21;
o |= (1<<26) | (1<<20);
if(v < 0) {
if(sc & C_UBIT) diag(".U on neg offset");
v = -v;
o ^= 1 << 23;
}
if(v >= (1<<12) || v < 0)
diag("literal span too large: %d (R%d)\n%P", v, b, PP);
o |= v;
o |= b << 16;
o |= r << 12;
return o;
}
int32
olhr(int32 v, int b, int r, int sc)
{
int32 o;
if(sc & C_SBIT)
diag(".S on LDRH/STRH instruction");
o = (sc & C_SCOND) << 28;
if(!(sc & C_PBIT))
o |= 1 << 24;
if(sc & C_WBIT)
o |= 1 << 21;
o |= (1<<23) | (1<<20)|(0xb<<4);
if(v < 0) {
v = -v;
o ^= 1 << 23;
}
if(v >= (1<<8) || v < 0)
diag("literal span too large: %d (R%d)\n%P", v, b, PP);
o |= (v&0xf)|((v>>4)<<8)|(1<<22);
o |= b << 16;
o |= r << 12;
return o;
}
int32
osr(int a, int r, int32 v, int b, int sc)
{
int32 o;
o = olr(v, b, r, sc) ^ (1<<20);
if(a != AMOVW)
o |= 1<<22;
return o;
}
int32
oshr(int r, int32 v, int b, int sc)
{
int32 o;
o = olhr(v, b, r, sc) ^ (1<<20);
return o;
}
int32
osrr(int r, int i, int b, int sc)
{
return olr(i, b, r, sc) ^ ((1<<25) | (1<<20));
}
int32
oshrr(int r, int i, int b, int sc)
{
return olhr(i, b, r, sc) ^ ((1<<22) | (1<<20));
}
int32
olrr(int i, int b, int r, int sc)
{
return olr(i, b, r, sc) ^ (1<<25);
}
int32
olhrr(int i, int b, int r, int sc)
{
return olhr(i, b, r, sc) ^ (1<<22);
}
int32
ofsr(int a, int r, int32 v, int b, int sc, Prog *p)
{
int32 o;
if(sc & C_SBIT)
diag(".S on FLDR/FSTR instruction");
o = (sc & C_SCOND) << 28;
if(!(sc & C_PBIT))
o |= 1 << 24;
if(sc & C_WBIT)
o |= 1 << 21;
o |= (6<<25) | (1<<24) | (1<<23) | (10<<8);
if(v < 0) {
v = -v;
o ^= 1 << 23;
}
if(v & 3)
diag("odd offset for floating point op: %d\n%P", v, p);
else
if(v >= (1<<10) || v < 0)
diag("literal span too large: %d\n%P", v, p);
o |= (v>>2) & 0xFF;
o |= b << 16;
o |= r << 12;
switch(a) {
default:
diag("bad fst %A", a);
case AMOVD:
o |= 1 << 8;
case AMOVF:
break;
}
return o;
}
int32
omvl(Prog *p, Adr *a, int dr)
{
int32 v, o1;
if(!p->cond) {
aclass(a);
v = immrot(~instoffset);
if(v == 0) {
diag("missing literal");
prasm(p);
return 0;
}
o1 = oprrr(AMVN, p->scond&C_SCOND);
o1 |= v;
o1 |= dr << 12;
} else {
v = p->cond->pc - p->pc - 8;
o1 = olr(v, REGPC, dr, p->scond&C_SCOND);
}
return o1;
}
int
chipzero(Ieee *e)
{
// We use GOARM=7 to gate the use of VFPv3 vmov (imm) instructions.
if(goarm < 7 || e->l != 0 || e->h != 0)
return -1;
return 0;
}
int
chipfloat(Ieee *e)
{
int n;
ulong h;
// We use GOARM=7 to gate the use of VFPv3 vmov (imm) instructions.
if(goarm < 7)
goto no;
if(e->l != 0 || (e->h&0xffff) != 0)
goto no;
h = e->h & 0x7fc00000;
if(h != 0x40000000 && h != 0x3fc00000)
goto no;
n = 0;
// sign bit (a)
if(e->h & 0x80000000)
n |= 1<<7;
// exp sign bit (b)
if(h == 0x3fc00000)
n |= 1<<6;
// rest of exp and mantissa (cd-efgh)
n |= (e->h >> 16) & 0x3f;
//print("match %.8lux %.8lux %d\n", e->l, e->h, n);
return n;
no:
return -1;
}
void
genasmsym(void (*put)(Sym*, char*, int, vlong, vlong, int, Sym*))
{
Auto *a;
Sym *s;
int h;
s = lookup("etext", 0);
if(s->type == STEXT)
put(s, s->name, 'T', s->value, s->size, s->version, 0);
for(h=0; h<NHASH; h++) {
for(s=hash[h]; s!=S; s=s->hash) {
if(s->hide)
continue;
switch(s->type&SMASK) {
case SCONST:
case SRODATA:
case SDATA:
case SELFROSECT:
case STYPE:
case SSTRING:
case SGOSTRING:
case SNOPTRDATA:
case SSYMTAB:
case SPCLNTAB:
case SGCDATA:
case SGCBSS:
if(!s->reachable)
continue;
put(s, s->name, 'D', s->value, s->size, s->version, s->gotype);
continue;
case SBSS:
case SNOPTRBSS:
if(!s->reachable)
continue;
if(s->np > 0)
diag("%s should not be bss (size=%d type=%d special=%d)", s->name, (int)s->np, s->type, s->special);
put(s, s->name, 'B', s->value, s->size, s->version, s->gotype);
continue;
case SFILE:
put(nil, s->name, 'f', s->value, 0, s->version, 0);
continue;
}
}
}
for(s = textp; s != nil; s = s->next) {
if(s->text == nil)
continue;
/* filenames first */
for(a=s->autom; a; a=a->link)
if(a->type == D_FILE)
put(nil, a->asym->name, 'z', a->aoffset, 0, 0, 0);
else
if(a->type == D_FILE1)
put(nil, a->asym->name, 'Z', a->aoffset, 0, 0, 0);
put(s, s->name, 'T', s->value, s->size, s->version, s->gotype);
/* frame, auto and param after */
put(nil, ".frame", 'm', s->text->to.offset+4, 0, 0, 0);
for(a=s->autom; a; a=a->link)
if(a->type == D_AUTO)
put(nil, a->asym->name, 'a', -a->aoffset, 0, 0, a->gotype);
else
if(a->type == D_PARAM)
put(nil, a->asym->name, 'p', a->aoffset, 0, 0, a->gotype);
}
if(debug['v'] || debug['n'])
Bprint(&bso, "symsize = %ud\n", symsize);
Bflush(&bso);
}
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