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From fc3e6af10297b424175b44d2274de04c5f0b9e82 Mon Sep 17 00:00:00 2001
From: Joel Sing <joel@sing.id.au>
Date: Tue, 19 May 2020 18:54:48 +1000
Subject: [PATCH] cmd/link: add support for external linking on linux/riscv64
Change-Id: I9902c36c94478f2b2e0739bb68ceccc23b53f0ec
---
src/cmd/link/internal/arm/asm.go | 2 +-
src/cmd/link/internal/arm64/asm.go | 2 +-
src/cmd/link/internal/ld/config.go | 4 +-
src/cmd/link/internal/ld/elf.go | 3 +
src/cmd/link/internal/ld/elf2.go | 2 +-
src/cmd/link/internal/ld/lib.go | 2 +-
src/cmd/link/internal/ld/pcln.go | 2 +-
src/cmd/link/internal/ld/symtab.go | 12 ++-
src/cmd/link/internal/loadelf/ldelf.go | 48 ++++++++++--
src/cmd/link/internal/mips/asm.go | 2 +-
src/cmd/link/internal/mips64/asm.go | 2 +-
src/cmd/link/internal/ppc64/asm.go | 2 +-
src/cmd/link/internal/riscv64/asm.go | 129 ++++++++++++++++++++++++++++++++-
src/cmd/link/internal/s390x/asm.go | 2 +-
src/cmd/link/internal/x86/asm.go | 2 +-
15 files changed, 190 insertions(+), 26 deletions(-)
diff --git a/src/cmd/link/internal/arm/asm.go b/src/cmd/link/internal/arm/asm.go
index 903e621..7e97c13 100644
--- a/src/cmd/link/internal/arm/asm.go
+++ b/src/cmd/link/internal/arm/asm.go
@@ -249,7 +249,7 @@ func adddynrel2(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, s load
return false
}
-func elfreloc1(ctxt *ld.Link, r *sym.Reloc, sectoff int64) bool {
+func elfreloc1(ctxt *ld.Link, s *sym.Symbol, r *sym.Reloc, sectoff int64) bool {
ctxt.Out.Write32(uint32(sectoff))
elfsym := ld.ElfSymForReloc(ctxt, r.Xsym)
diff --git a/src/cmd/link/internal/arm64/asm.go b/src/cmd/link/internal/arm64/asm.go
index 417e4b1..aac8bec 100644
--- a/src/cmd/link/internal/arm64/asm.go
+++ b/src/cmd/link/internal/arm64/asm.go
@@ -325,7 +325,7 @@ func adddynrel2(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, s load
return false
}
-func elfreloc1(ctxt *ld.Link, r *sym.Reloc, sectoff int64) bool {
+func elfreloc1(ctxt *ld.Link, s *sym.Symbol, r *sym.Reloc, sectoff int64) bool {
ctxt.Out.Write64(uint64(sectoff))
elfsym := ld.ElfSymForReloc(ctxt, r.Xsym)
diff --git a/src/cmd/link/internal/ld/config.go b/src/cmd/link/internal/ld/config.go
index 2373b50..2186bf5 100644
--- a/src/cmd/link/internal/ld/config.go
+++ b/src/cmd/link/internal/ld/config.go
@@ -186,7 +186,7 @@ func mustLinkExternal(ctxt *Link) (res bool, reason string) {
// Internally linking cgo is incomplete on some architectures.
// https://golang.org/issue/14449
// https://golang.org/issue/21961
- if iscgo && ctxt.Arch.InFamily(sys.MIPS64, sys.MIPS, sys.PPC64) {
+ if iscgo && ctxt.Arch.InFamily(sys.MIPS64, sys.MIPS, sys.PPC64, sys.RISCV64) {
return true, objabi.GOARCH + " does not support internal cgo"
}
if iscgo && objabi.GOOS == "android" {
@@ -263,8 +263,6 @@ func determineLinkMode(ctxt *Link) {
}
case LinkExternal:
switch {
- case objabi.GOARCH == "riscv64":
- Exitf("external linking not supported for %s/riscv64", objabi.GOOS)
case objabi.GOARCH == "ppc64" && objabi.GOOS != "aix":
Exitf("external linking not supported for %s/ppc64", objabi.GOOS)
}
diff --git a/src/cmd/link/internal/ld/elf.go b/src/cmd/link/internal/ld/elf.go
index 78298be..5468fb8 100644
--- a/src/cmd/link/internal/ld/elf.go
+++ b/src/cmd/link/internal/ld/elf.go
@@ -506,6 +506,9 @@ func Elfinit(ctxt *Link) {
if ctxt.Arch.Family == sys.MIPS64 {
ehdr.flags = 0x20000004 /* MIPS 3 CPIC */
}
+ if ctxt.Arch.Family == sys.RISCV64 {
+ ehdr.flags = 0x4 /* RISCV Float ABI Double */
+ }
elf64 = true
ehdr.phoff = ELF64HDRSIZE /* Must be ELF64HDRSIZE: first PHdr must follow ELF header */
diff --git a/src/cmd/link/internal/ld/elf2.go b/src/cmd/link/internal/ld/elf2.go
index 07b64cf..41c927c 100644
--- a/src/cmd/link/internal/ld/elf2.go
+++ b/src/cmd/link/internal/ld/elf2.go
@@ -69,7 +69,7 @@ func elfrelocsect2(ctxt *Link, sect *sym.Section, syms []*sym.Symbol) {
if !r.Xsym.Attr.Reachable() {
Errorf(s, "unreachable reloc %d (%s) target %v", r.Type, sym.RelocName(ctxt.Arch, r.Type), r.Xsym.Name)
}
- if !thearch.Elfreloc1(ctxt, r, int64(uint64(s.Value+int64(r.Off))-sect.Vaddr)) {
+ if !thearch.Elfreloc1(ctxt, s, r, int64(uint64(s.Value+int64(r.Off))-sect.Vaddr)) {
Errorf(s, "unsupported obj reloc %d (%s)/%d to %s", r.Type, sym.RelocName(ctxt.Arch, r.Type), r.Siz, r.Sym.Name)
}
}
diff --git a/src/cmd/link/internal/ld/lib.go b/src/cmd/link/internal/ld/lib.go
index 0366bc7..873c1e8 100644
--- a/src/cmd/link/internal/ld/lib.go
+++ b/src/cmd/link/internal/ld/lib.go
@@ -271,7 +271,7 @@ type Arch struct {
Asmb func(*Link, *loader.Loader)
Asmb2 func(*Link)
- Elfreloc1 func(*Link, *sym.Reloc, int64) bool
+ Elfreloc1 func(*Link, *sym.Symbol, *sym.Reloc, int64) bool
Elfreloc2 func(*Link, *loader.Loader, loader.Sym, loader.ExtRelocView, int64) bool
Elfsetupplt func(ctxt *Link, plt, gotplt *loader.SymbolBuilder, dynamic loader.Sym)
Gentext func(*Link)
diff --git a/src/cmd/link/internal/ld/pcln.go b/src/cmd/link/internal/ld/pcln.go
index 5cbb7bb..ac97871 100644
--- a/src/cmd/link/internal/ld/pcln.go
+++ b/src/cmd/link/internal/ld/pcln.go
@@ -574,7 +574,7 @@ func expandGoroot(s string) string {
const (
BUCKETSIZE = 256 * MINFUNC
- SUBBUCKETS = 16
+ SUBBUCKETS = 32
SUBBUCKETSIZE = BUCKETSIZE / SUBBUCKETS
NOIDX = 0x7fffffff
)
diff --git a/src/cmd/link/internal/ld/symtab.go b/src/cmd/link/internal/ld/symtab.go
index 46aa33b..28a728f 100644
--- a/src/cmd/link/internal/ld/symtab.go
+++ b/src/cmd/link/internal/ld/symtab.go
@@ -185,7 +185,11 @@ func putelfsym(ctxt *Link, x *sym.Symbol, s string, t SymbolType, addr int64) {
// ELF linker -Bsymbolic-functions option, but that is buggy on
// several platforms.
putelfsyment(ctxt.Out, putelfstr("local."+s), addr, size, STB_LOCAL<<4|typ&0xf, elfshnum, other)
- ctxt.loader.SetSymLocalElfSym(loader.Sym(x.SymIdx), int32(ctxt.numelfsym))
+ if ctxt.Target.IsRISCV64() && x.SymIdx == 0 {
+ x.SetGot(int32(ctxt.numelfsym))
+ } else {
+ ctxt.loader.SetSymLocalElfSym(loader.Sym(x.SymIdx), int32(ctxt.numelfsym))
+ }
ctxt.numelfsym++
return
} else if bind != ctxt.elfbind {
@@ -193,7 +197,11 @@ func putelfsym(ctxt *Link, x *sym.Symbol, s string, t SymbolType, addr int64) {
}
putelfsyment(ctxt.Out, putelfstr(s), addr, size, bind<<4|typ&0xf, elfshnum, other)
- ctxt.loader.SetSymElfSym(loader.Sym(x.SymIdx), int32(ctxt.numelfsym))
+ if ctxt.Target.IsRISCV64() && x.SymIdx == 0 {
+ x.SetGot(int32(ctxt.numelfsym))
+ } else {
+ ctxt.loader.SetSymElfSym(loader.Sym(x.SymIdx), int32(ctxt.numelfsym))
+ }
ctxt.numelfsym++
}
diff --git a/src/cmd/link/internal/loadelf/ldelf.go b/src/cmd/link/internal/loadelf/ldelf.go
index bb5b4ff..1f5fd64 100644
--- a/src/cmd/link/internal/loadelf/ldelf.go
+++ b/src/cmd/link/internal/loadelf/ldelf.go
@@ -372,6 +372,11 @@ func Load(l *loader.Loader, arch *sys.Arch, localSymVersion int, f *bio.Reader,
return errorf("elf object but not ppc64")
}
+ case sys.RISCV64:
+ if mach != elf.EM_RISCV || class != elf.ELFCLASS64 {
+ return errorf("elf object but not riscv64")
+ }
+
case sys.S390X:
if mach != elf.EM_S390 || class != elf.ELFCLASS64 {
return errorf("elf object but not s390x")
@@ -591,6 +596,11 @@ func Load(l *loader.Loader, arch *sys.Arch, localSymVersion int, f *bio.Reader,
continue
}
+ if strings.HasPrefix(sect.name, ".debug_") && elfsym.type_ == 0 {
+ // This happens with gcc on RISCV64.
+ continue
+ }
+
if strings.HasPrefix(elfsym.name, ".LASF") { // gcc on s390x does this
continue
}
@@ -946,14 +956,15 @@ func relSize(arch *sys.Arch, pn string, elftype uint32) (uint8, error) {
// performance.
const (
- AMD64 = uint32(sys.AMD64)
- ARM = uint32(sys.ARM)
- ARM64 = uint32(sys.ARM64)
- I386 = uint32(sys.I386)
- PPC64 = uint32(sys.PPC64)
- S390X = uint32(sys.S390X)
- MIPS = uint32(sys.MIPS)
- MIPS64 = uint32(sys.MIPS64)
+ AMD64 = uint32(sys.AMD64)
+ ARM = uint32(sys.ARM)
+ ARM64 = uint32(sys.ARM64)
+ I386 = uint32(sys.I386)
+ MIPS = uint32(sys.MIPS)
+ MIPS64 = uint32(sys.MIPS64)
+ PPC64 = uint32(sys.PPC64)
+ RISCV64 = uint32(sys.RISCV64)
+ S390X = uint32(sys.S390X)
)
switch uint32(arch.Family) | elftype<<16 {
@@ -1056,6 +1067,27 @@ func relSize(arch *sys.Arch, pn string, elftype uint32) (uint8, error) {
S390X | uint32(elf.R_390_GOT64)<<16,
S390X | uint32(elf.R_390_PLT64)<<16:
return 8, nil
+
+ case RISCV64 | uint32(elf.R_RISCV_RVC_BRANCH)<<16,
+ RISCV64 | uint32(elf.R_RISCV_RVC_JUMP)<<16:
+ return 2, nil
+
+ case RISCV64 | uint32(elf.R_RISCV_32)<<16,
+ RISCV64 | uint32(elf.R_RISCV_BRANCH)<<16,
+ RISCV64 | uint32(elf.R_RISCV_HI20)<<16,
+ RISCV64 | uint32(elf.R_RISCV_LO12_I)<<16,
+ RISCV64 | uint32(elf.R_RISCV_LO12_S)<<16,
+ RISCV64 | uint32(elf.R_RISCV_GOT_HI20)<<16,
+ RISCV64 | uint32(elf.R_RISCV_PCREL_HI20)<<16,
+ RISCV64 | uint32(elf.R_RISCV_PCREL_LO12_I)<<16,
+ RISCV64 | uint32(elf.R_RISCV_PCREL_LO12_S)<<16,
+ RISCV64 | uint32(elf.R_RISCV_RELAX)<<16:
+ return 4, nil
+
+ case RISCV64 | uint32(elf.R_RISCV_64)<<16,
+ RISCV64 | uint32(elf.R_RISCV_CALL)<<16,
+ RISCV64 | uint32(elf.R_RISCV_CALL_PLT)<<16:
+ return 8, nil
}
}
diff --git a/src/cmd/link/internal/mips/asm.go b/src/cmd/link/internal/mips/asm.go
index 9710b9c..37a7700 100644
--- a/src/cmd/link/internal/mips/asm.go
+++ b/src/cmd/link/internal/mips/asm.go
@@ -51,7 +51,7 @@ func adddynrel(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, s *sym.
return false
}
-func elfreloc1(ctxt *ld.Link, r *sym.Reloc, sectoff int64) bool {
+func elfreloc1(ctxt *ld.Link, s *sym.Symbol, r *sym.Reloc, sectoff int64) bool {
ctxt.Out.Write32(uint32(sectoff))
elfsym := ld.ElfSymForReloc(ctxt, r.Xsym)
diff --git a/src/cmd/link/internal/mips64/asm.go b/src/cmd/link/internal/mips64/asm.go
index b48241b..b688a8f 100644
--- a/src/cmd/link/internal/mips64/asm.go
+++ b/src/cmd/link/internal/mips64/asm.go
@@ -49,7 +49,7 @@ func adddynrel(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, s *sym.
return false
}
-func elfreloc1(ctxt *ld.Link, r *sym.Reloc, sectoff int64) bool {
+func elfreloc1(ctxt *ld.Link, s *sym.Symbol, r *sym.Reloc, sectoff int64) bool {
// mips64 ELF relocation (endian neutral)
// offset uint64
// sym uint32
diff --git a/src/cmd/link/internal/ppc64/asm.go b/src/cmd/link/internal/ppc64/asm.go
index b1c0873..1aa5051 100644
--- a/src/cmd/link/internal/ppc64/asm.go
+++ b/src/cmd/link/internal/ppc64/asm.go
@@ -443,7 +443,7 @@ func xcoffreloc1(arch *sys.Arch, out *ld.OutBuf, s *sym.Symbol, r *sym.Reloc, se
}
-func elfreloc1(ctxt *ld.Link, r *sym.Reloc, sectoff int64) bool {
+func elfreloc1(ctxt *ld.Link, s *sym.Symbol, r *sym.Reloc, sectoff int64) bool {
// Beware that bit0~bit15 start from the third byte of a instruction in Big-Endian machines.
if r.Type == objabi.R_ADDR || r.Type == objabi.R_POWER_TLS || r.Type == objabi.R_CALLPOWER {
} else {
diff --git a/src/cmd/link/internal/riscv64/asm.go b/src/cmd/link/internal/riscv64/asm.go
index 5183de8..a3f19b2 100644
--- a/src/cmd/link/internal/riscv64/asm.go
+++ b/src/cmd/link/internal/riscv64/asm.go
@@ -11,11 +11,16 @@ import (
"cmd/link/internal/ld"
"cmd/link/internal/loader"
"cmd/link/internal/sym"
+ "debug/elf"
"fmt"
"log"
+ "sort"
"sync"
)
+// fakeLabelName matches the RISCV_FAKE_LABEL_NAME from binutils.
+const fakeLabelName = ".L0 "
+
func gentext2(ctxt *ld.Link, ldr *loader.Loader) {
}
@@ -28,9 +33,72 @@ func adddynrel(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, s *sym.
return false
}
-func elfreloc1(ctxt *ld.Link, r *sym.Reloc, sectoff int64) bool {
- log.Fatalf("elfreloc1")
- return false
+func findHI20Symbol(ctxt *ld.Link, val int64) *sym.Symbol {
+ for idx := sort.Search(len(ctxt.Textp), func(i int) bool { return ctxt.Textp[i].Value >= val }); idx < len(ctxt.Textp); idx++ {
+ s := ctxt.Textp[idx]
+ if s.Value != val {
+ return nil
+ }
+ if s.Type == sym.STEXT && s.Name == fakeLabelName {
+ return s
+ }
+ }
+ return nil
+}
+
+func elfreloc1(ctxt *ld.Link, s *sym.Symbol, r *sym.Reloc, sectoff int64) bool {
+ elfsym := ld.ElfSymForReloc(ctxt, r.Xsym)
+ switch r.Type {
+ case objabi.R_ADDR:
+ ctxt.Out.Write64(uint64(sectoff))
+ switch r.Siz {
+ case 4:
+ ctxt.Out.Write64(uint64(elf.R_RISCV_32) | uint64(elfsym)<<32)
+ case 8:
+ ctxt.Out.Write64(uint64(elf.R_RISCV_64) | uint64(elfsym)<<32)
+ default:
+ ld.Errorf(nil, "unknown size %d for %v relocation", r.Siz, r.Type)
+ return false
+ }
+ ctxt.Out.Write64(uint64(r.Xadd))
+
+ case objabi.R_CALLRISCV:
+ // Call relocations are currently handled via R_RISCV_PCREL_ITYPE.
+ // TODO(jsing): Consider generating elf.R_RISCV_CALL instead of a
+ // HI20/LO12_I pair.
+
+ case objabi.R_RISCV_PCREL_ITYPE, objabi.R_RISCV_PCREL_STYPE:
+ // Find the text symbol for the AUIPC instruction targeted
+ // by this relocation.
+ hi20Sym := findHI20Symbol(ctxt, s.Value+int64(r.Off))
+ if hi20Sym == nil || hi20Sym.Type != sym.STEXT {
+ ld.Errorf(nil, "failed to find text symbol for HI20 relocation at %d (%x)", sectoff, s.Value+int64(r.Off))
+ return false
+ }
+
+ // Emit two relocations - a R_RISCV_PCREL_HI20 relocation and a
+ // corresponding R_RISCV_PCREL_LO12_I or R_RISCV_PCREL_LO12_S relocation.
+ // Note that the LO12 relocation must refer to a text symbol that points
+ // to the instruction that has the HI20 relocation given for a symbol.
+ var hiRel, loRel elf.R_RISCV
+ switch r.Type {
+ case objabi.R_RISCV_PCREL_ITYPE:
+ hiRel, loRel = elf.R_RISCV_PCREL_HI20, elf.R_RISCV_PCREL_LO12_I
+ case objabi.R_RISCV_PCREL_STYPE:
+ hiRel, loRel = elf.R_RISCV_PCREL_HI20, elf.R_RISCV_PCREL_LO12_S
+ }
+ ctxt.Out.Write64(uint64(sectoff))
+ ctxt.Out.Write64(uint64(hiRel) | uint64(elfsym)<<32)
+ ctxt.Out.Write64(uint64(r.Xadd))
+ ctxt.Out.Write64(uint64(sectoff + 4))
+ ctxt.Out.Write64(uint64(loRel) | uint64(hi20Sym.Got())<<32)
+ ctxt.Out.Write64(uint64(0))
+
+ default:
+ return false
+ }
+
+ return true
}
func elfsetupplt(ctxt *ld.Link, plt, gotplt *loader.SymbolBuilder, dynamic loader.Sym) {
@@ -43,6 +111,36 @@ func machoreloc1(arch *sys.Arch, out *ld.OutBuf, s *sym.Symbol, r *sym.Reloc, se
}
func archreloc(target *ld.Target, syms *ld.ArchSyms, r *sym.Reloc, s *sym.Symbol, val int64) (int64, bool) {
+ if target.IsExternal() {
+ switch r.Type {
+ case objabi.R_CALLRISCV:
+ r.Done = false
+ r.Xsym = r.Sym
+ r.Xadd = r.Add
+ return val, true
+
+ case objabi.R_RISCV_PCREL_ITYPE, objabi.R_RISCV_PCREL_STYPE:
+ r.Done = false
+
+ // Set up addend for eventual relocation via outer symbol.
+ rs := r.Sym
+ r.Xadd = r.Add
+ for rs.Outer != nil {
+ r.Xadd += ld.Symaddr(rs) - ld.Symaddr(rs.Outer)
+ rs = rs.Outer
+ }
+
+ if rs.Type != sym.SHOSTOBJ && rs.Type != sym.SDYNIMPORT && rs.Sect == nil {
+ ld.Errorf(s, "missing section for %s", rs.Name)
+ }
+ r.Xsym = rs
+
+ return val, true
+ }
+
+ return val, false
+ }
+
switch r.Type {
case objabi.R_CALLRISCV:
// Nothing to do.
@@ -98,6 +196,29 @@ func archrelocvariant(target *ld.Target, syms *ld.ArchSyms, r *sym.Reloc, s *sym
return -1
}
+func genHi20TextSymbols(ctxt *ld.Link) {
+ // Generate a local text symbol for each relocation target, as the
+ // R_RISCV_PCREL_LO12_* relocations generated by elfreloc1 need it.
+ var syms []*sym.Symbol
+ for _, s := range ctxt.Textp {
+ for _, r := range s.R {
+ if r.Type != objabi.R_RISCV_PCREL_ITYPE && r.Type != objabi.R_RISCV_PCREL_STYPE {
+ continue
+ }
+ sym := &sym.Symbol{
+ Type: sym.STEXT,
+ Name: fakeLabelName,
+ Value: s.Value + int64(r.Off),
+ Attr: sym.AttrDuplicateOK | sym.AttrLocal | sym.AttrVisibilityHidden,
+ Sect: s.Sect,
+ }
+ syms = append(syms, sym)
+ }
+ }
+ ctxt.Textp = append(ctxt.Textp, syms...)
+ sort.SliceStable(ctxt.Textp, func(i, j int) bool { return ctxt.Textp[i].Value < ctxt.Textp[j].Value })
+}
+
func asmb(ctxt *ld.Link, _ *loader.Loader) {
if ctxt.IsELF {
ld.Asmbelfsetup()
@@ -141,6 +262,8 @@ func asmb2(ctxt *ld.Link) {
symo = uint32(ld.Rnd(int64(symo), int64(*ld.FlagRound)))
ctxt.Out.SeekSet(int64(symo))
+ genHi20TextSymbols(ctxt)
+
ld.Asmelfsym(ctxt)
ctxt.Out.Write(ld.Elfstrdat)
diff --git a/src/cmd/link/internal/s390x/asm.go b/src/cmd/link/internal/s390x/asm.go
index 2115b5f..0069259 100644
--- a/src/cmd/link/internal/s390x/asm.go
+++ b/src/cmd/link/internal/s390x/asm.go
@@ -221,7 +221,7 @@ func adddynrel2(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, s load
return false
}
-func elfreloc1(ctxt *ld.Link, r *sym.Reloc, sectoff int64) bool {
+func elfreloc1(ctxt *ld.Link, s *sym.Symbol, r *sym.Reloc, sectoff int64) bool {
ctxt.Out.Write64(uint64(sectoff))
elfsym := ld.ElfSymForReloc(ctxt, r.Xsym)
diff --git a/src/cmd/link/internal/x86/asm.go b/src/cmd/link/internal/x86/asm.go
index b218ffa..4713f1c 100644
--- a/src/cmd/link/internal/x86/asm.go
+++ b/src/cmd/link/internal/x86/asm.go
@@ -340,7 +340,7 @@ func adddynrel2(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, s load
return false
}
-func elfreloc1(ctxt *ld.Link, r *sym.Reloc, sectoff int64) bool {
+func elfreloc1(ctxt *ld.Link, s *sym.Symbol, r *sym.Reloc, sectoff int64) bool {
ctxt.Out.Write32(uint32(sectoff))
elfsym := ld.ElfSymForReloc(ctxt, r.Xsym)
--
1.8.3.1
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