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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package loong64
import (
"cmd/internal/objabi"
"cmd/internal/sys"
"cmd/link/internal/ld"
"cmd/link/internal/loader"
"cmd/link/internal/sym"
"debug/elf"
"log"
)
func gentext(ctxt *ld.Link, ldr *loader.Loader) {}
func adddynrel(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, s loader.Sym, r loader.Reloc, rIdx int) bool {
log.Fatalf("adddynrel not implemented")
return false
}
func elfreloc1(ctxt *ld.Link, out *ld.OutBuf, ldr *loader.Loader, s loader.Sym, r loader.ExtReloc, ri int, sectoff int64) bool {
// loong64 ELF relocation (endian neutral)
// offset uint64
// symreloc uint64 // The high 32-bit is the symbol, the low 32-bit is the relocation type.
// addend int64
elfsym := ld.ElfSymForReloc(ctxt, r.Xsym)
switch r.Type {
default:
return false
case objabi.R_ADDR, objabi.R_DWARFSECREF:
switch r.Size {
case 4:
out.Write64(uint64(sectoff))
out.Write64(uint64(elf.R_LARCH_32) | uint64(elfsym)<<32)
out.Write64(uint64(r.Xadd))
case 8:
out.Write64(uint64(sectoff))
out.Write64(uint64(elf.R_LARCH_64) | uint64(elfsym)<<32)
out.Write64(uint64(r.Xadd))
default:
return false
}
case objabi.R_ADDRLOONG64TLS:
out.Write64(uint64(sectoff))
out.Write64(uint64(elf.R_LARCH_TLS_LE_LO12) | uint64(elfsym)<<32)
out.Write64(uint64(r.Xadd))
case objabi.R_ADDRLOONG64TLSU:
out.Write64(uint64(sectoff))
out.Write64(uint64(elf.R_LARCH_TLS_LE_HI20) | uint64(elfsym)<<32)
out.Write64(uint64(r.Xadd))
case objabi.R_CALLLOONG64:
out.Write64(uint64(sectoff))
out.Write64(uint64(elf.R_LARCH_B26) | uint64(elfsym)<<32)
out.Write64(uint64(r.Xadd))
case objabi.R_LOONG64_TLS_IE_PCREL_HI:
out.Write64(uint64(sectoff))
out.Write64(uint64(elf.R_LARCH_TLS_IE_PC_HI20) | uint64(elfsym)<<32)
out.Write64(uint64(0x0))
case objabi.R_LOONG64_TLS_IE_LO:
out.Write64(uint64(sectoff))
out.Write64(uint64(elf.R_LARCH_TLS_IE_PC_LO12) | uint64(elfsym)<<32)
out.Write64(uint64(0x0))
case objabi.R_ADDRLOONG64:
out.Write64(uint64(sectoff))
out.Write64(uint64(elf.R_LARCH_PCALA_LO12) | uint64(elfsym)<<32)
out.Write64(uint64(r.Xadd))
case objabi.R_ADDRLOONG64U:
out.Write64(uint64(sectoff))
out.Write64(uint64(elf.R_LARCH_PCALA_HI20) | uint64(elfsym)<<32)
out.Write64(uint64(r.Xadd))
}
return true
}
func elfsetupplt(ctxt *ld.Link, plt, gotplt *loader.SymbolBuilder, dynamic loader.Sym) {
return
}
func machoreloc1(*sys.Arch, *ld.OutBuf, *loader.Loader, loader.Sym, loader.ExtReloc, int64) bool {
return false
}
func archreloc(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, r loader.Reloc, s loader.Sym, val int64) (o int64, nExtReloc int, ok bool) {
rs := r.Sym()
if target.IsExternal() {
switch r.Type() {
default:
return val, 0, false
case objabi.R_ADDRLOONG64,
objabi.R_ADDRLOONG64U:
// set up addend for eventual relocation via outer symbol.
rs, _ := ld.FoldSubSymbolOffset(ldr, rs)
rst := ldr.SymType(rs)
if rst != sym.SHOSTOBJ && rst != sym.SDYNIMPORT && ldr.SymSect(rs) == nil {
ldr.Errorf(s, "missing section for %s", ldr.SymName(rs))
}
return val, 1, true
case objabi.R_ADDRLOONG64TLS,
objabi.R_ADDRLOONG64TLSU,
objabi.R_CALLLOONG64,
objabi.R_JMPLOONG64,
objabi.R_LOONG64_TLS_IE_PCREL_HI,
objabi.R_LOONG64_TLS_IE_LO:
return val, 1, true
}
}
const isOk = true
const noExtReloc = 0
switch r.Type() {
case objabi.R_CONST:
return r.Add(), noExtReloc, isOk
case objabi.R_GOTOFF:
return ldr.SymValue(r.Sym()) + r.Add() - ldr.SymValue(syms.GOT), noExtReloc, isOk
case objabi.R_ADDRLOONG64,
objabi.R_ADDRLOONG64U:
pc := ldr.SymValue(s) + int64(r.Off())
t := calculatePCAlignedReloc(r.Type(), ldr.SymAddr(rs)+r.Add(), pc)
if r.Type() == objabi.R_ADDRLOONG64 {
return int64(val&0xffc003ff | (t << 10)), noExtReloc, isOk
}
return int64(val&0xfe00001f | (t << 5)), noExtReloc, isOk
case objabi.R_ADDRLOONG64TLS,
objabi.R_ADDRLOONG64TLSU:
t := ldr.SymAddr(rs) + r.Add()
if r.Type() == objabi.R_ADDRLOONG64TLS {
return int64(val&0xffc003ff | ((t & 0xfff) << 10)), noExtReloc, isOk
}
return int64(val&0xfe00001f | (((t) >> 12 << 5) & 0x1ffffe0)), noExtReloc, isOk
case objabi.R_CALLLOONG64,
objabi.R_JMPLOONG64:
pc := ldr.SymValue(s) + int64(r.Off())
t := ldr.SymAddr(rs) + r.Add() - pc
return int64(val&0xfc000000 | (((t >> 2) & 0xffff) << 10) | (((t >> 2) & 0x3ff0000) >> 16)), noExtReloc, isOk
}
return val, 0, false
}
func archrelocvariant(*ld.Target, *loader.Loader, loader.Reloc, sym.RelocVariant, loader.Sym, int64, []byte) int64 {
return -1
}
func extreloc(target *ld.Target, ldr *loader.Loader, r loader.Reloc, s loader.Sym) (loader.ExtReloc, bool) {
switch r.Type() {
case objabi.R_ADDRLOONG64,
objabi.R_ADDRLOONG64U:
return ld.ExtrelocViaOuterSym(ldr, r, s), true
case objabi.R_ADDRLOONG64TLS,
objabi.R_ADDRLOONG64TLSU,
objabi.R_CONST,
objabi.R_GOTOFF,
objabi.R_CALLLOONG64,
objabi.R_JMPLOONG64,
objabi.R_LOONG64_TLS_IE_PCREL_HI,
objabi.R_LOONG64_TLS_IE_LO:
return ld.ExtrelocSimple(ldr, r), true
}
return loader.ExtReloc{}, false
}
func isRequestingLowPageBits(t objabi.RelocType) bool {
switch t {
case objabi.R_ADDRLOONG64:
return true
}
return false
}
// Calculates the value to put into the immediate slot, according to the
// desired relocation type, target and PC.
// The value to use varies based on the reloc type. Namely, the absolute low
// bits of the target are to be used for the low part, while the page-aligned
// offset is to be used for the higher part. A "page" here is not related to
// the system's actual page size, but rather a fixed 12-bit range (designed to
// cooperate with ADDI/LD/ST's 12-bit immediates).
func calculatePCAlignedReloc(t objabi.RelocType, tgt int64, pc int64) int64 {
if isRequestingLowPageBits(t) {
// corresponding immediate field is 12 bits wide
return tgt & 0xfff
}
pageDelta := (tgt >> 12) - (pc >> 12)
if tgt&0xfff >= 0x800 {
// adjust for sign-extended addition of the low bits
pageDelta += 1
}
// corresponding immediate field is 20 bits wide
return pageDelta & 0xfffff
}
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