本文整理匯總了Golang中bootstrap/link/internal/ld.Reloc類的典型用法代碼示例。如果您正苦於以下問題：Golang Reloc類的具體用法？Golang Reloc怎麽用？Golang Reloc使用的例子？那麽, 這裏精選的類代碼示例或許可以為您提供幫助。
在下文中一共展示了Reloc類的5個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Golang代碼示例。
示例1: adddynrel
func adddynrel(s *ld.LSym, r *ld.Reloc) {
targ := r.Sym
ld.Ctxt.Cursym = s
switch r.Type {
default:
if r.Type >= 256 {
ld.Diag("unexpected relocation type %d", r.Type)
return
}
// Handle relocations found in ELF object files.
case 256 + ld.R_X86_64_PC32:
if targ.Type == obj.SDYNIMPORT {
ld.Diag("unexpected R_X86_64_PC32 relocation for dynamic symbol %s", targ.Name)
}
if targ.Type == 0 || targ.Type == obj.SXREF {
ld.Diag("unknown symbol %s in pcrel", targ.Name)
}
r.Type = obj.R_PCREL
r.Add += 4
return
case 256 + ld.R_X86_64_PLT32:
r.Type = obj.R_PCREL
r.Add += 4
if targ.Type == obj.SDYNIMPORT {
addpltsym(targ)
r.Sym = ld.Linklookup(ld.Ctxt, ".plt", 0)
r.Add += int64(targ.Plt)
}
return
case 256 + ld.R_X86_64_GOTPCREL, 256 + ld.R_X86_64_GOTPCRELX, 256 + ld.R_X86_64_REX_GOTPCRELX:
if targ.Type != obj.SDYNIMPORT {
// have symbol
if r.Off >= 2 && s.P[r.Off-2] == 0x8b {
// turn MOVQ of GOT entry into LEAQ of symbol itself
s.P[r.Off-2] = 0x8d
r.Type = obj.R_PCREL
r.Add += 4
return
}
}
// fall back to using GOT and hope for the best (CMOV*)
// TODO: just needs relocation, no need to put in .dynsym
addgotsym(targ)
r.Type = obj.R_PCREL
r.Sym = ld.Linklookup(ld.Ctxt, ".got", 0)
r.Add += 4
r.Add += int64(targ.Got)
return
case 256 + ld.R_X86_64_64:
if targ.Type == obj.SDYNIMPORT {
ld.Diag("unexpected R_X86_64_64 relocation for dynamic symbol %s", targ.Name)
}
r.Type = obj.R_ADDR
return
// Handle relocations found in Mach-O object files.
case 512 + ld.MACHO_X86_64_RELOC_UNSIGNED*2 + 0,
512 + ld.MACHO_X86_64_RELOC_SIGNED*2 + 0,
512 + ld.MACHO_X86_64_RELOC_BRANCH*2 + 0:
// TODO: What is the difference between all these?
r.Type = obj.R_ADDR
if targ.Type == obj.SDYNIMPORT {
ld.Diag("unexpected reloc for dynamic symbol %s", targ.Name)
}
return
case 512 + ld.MACHO_X86_64_RELOC_BRANCH*2 + 1:
if targ.Type == obj.SDYNIMPORT {
addpltsym(targ)
r.Sym = ld.Linklookup(ld.Ctxt, ".plt", 0)
r.Add = int64(targ.Plt)
r.Type = obj.R_PCREL
return
}
fallthrough
// fall through
case 512 + ld.MACHO_X86_64_RELOC_UNSIGNED*2 + 1,
512 + ld.MACHO_X86_64_RELOC_SIGNED*2 + 1,
512 + ld.MACHO_X86_64_RELOC_SIGNED_1*2 + 1,
512 + ld.MACHO_X86_64_RELOC_SIGNED_2*2 + 1,
512 + ld.MACHO_X86_64_RELOC_SIGNED_4*2 + 1:
r.Type = obj.R_PCREL
if targ.Type == obj.SDYNIMPORT {
ld.Diag("unexpected pc-relative reloc for dynamic symbol %s", targ.Name)
}
return
case 512 + ld.MACHO_X86_64_RELOC_GOT_LOAD*2 + 1:
//.........這裏部分代碼省略.........
示例2: archreloc
func archreloc(r *ld.Reloc, s *ld.LSym, val *int64) int {
if ld.Linkmode == ld.LinkExternal {
switch r.Type {
default:
return -1
case obj.R_ARM64_GOTPCREL:
var o1, o2 uint32
if ld.Ctxt.Arch.ByteOrder == binary.BigEndian {
o1 = uint32(*val >> 32)
o2 = uint32(*val)
} else {
o1 = uint32(*val)
o2 = uint32(*val >> 32)
}
// Any relocation against a function symbol is redirected to
// be against a local symbol instead (see putelfsym in
// symtab.go) but unfortunately the system linker was buggy
// when confronted with a R_AARCH64_ADR_GOT_PAGE relocation
// against a local symbol until May 2015
// (https://sourceware.org/bugzilla/show_bug.cgi?id=18270). So
// we convert the adrp; ld64 + R_ARM64_GOTPCREL into adrp;
// add + R_ADDRARM64.
if !(r.Sym.Version != 0 || (r.Sym.Type&obj.SHIDDEN != 0) || r.Sym.Local) && r.Sym.Type == obj.STEXT && ld.DynlinkingGo() {
if o2&0xffc00000 != 0xf9400000 {
ld.Ctxt.Diag("R_ARM64_GOTPCREL against unexpected instruction %x", o2)
}
o2 = 0x91000000 | (o2 & 0x000003ff)
r.Type = obj.R_ADDRARM64
}
if ld.Ctxt.Arch.ByteOrder == binary.BigEndian {
*val = int64(o1)<<32 | int64(o2)
} else {
*val = int64(o2)<<32 | int64(o1)
}
fallthrough
case obj.R_ADDRARM64:
r.Done = 0
// 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 != obj.SHOSTOBJ && rs.Type != obj.SDYNIMPORT && rs.Sect == nil {
ld.Diag("missing section for %s", rs.Name)
}
r.Xsym = rs
// Note: ld64 currently has a bug that any non-zero addend for BR26 relocation
// will make the linking fail because it thinks the code is not PIC even though
// the BR26 relocation should be fully resolved at link time.
// That is the reason why the next if block is disabled. When the bug in ld64
// is fixed, we can enable this block and also enable duff's device in cmd/7g.
if false && ld.HEADTYPE == obj.Hdarwin {
var o0, o1 uint32
if ld.Ctxt.Arch.ByteOrder == binary.BigEndian {
o0 = uint32(*val >> 32)
o1 = uint32(*val)
} else {
o0 = uint32(*val)
o1 = uint32(*val >> 32)
}
// Mach-O wants the addend to be encoded in the instruction
// Note that although Mach-O supports ARM64_RELOC_ADDEND, it
// can only encode 24-bit of signed addend, but the instructions
// supports 33-bit of signed addend, so we always encode the
// addend in place.
o0 |= (uint32((r.Xadd>>12)&3) << 29) | (uint32((r.Xadd>>12>>2)&0x7ffff) << 5)
o1 |= uint32(r.Xadd&0xfff) << 10
r.Xadd = 0
// when laid out, the instruction order must always be o1, o2.
if ld.Ctxt.Arch.ByteOrder == binary.BigEndian {
*val = int64(o0)<<32 | int64(o1)
} else {
*val = int64(o1)<<32 | int64(o0)
}
}
return 0
case obj.R_CALLARM64,
obj.R_ARM64_TLS_LE,
obj.R_ARM64_TLS_IE:
r.Done = 0
r.Xsym = r.Sym
r.Xadd = r.Add
return 0
}
}
switch r.Type {
case obj.R_CONST:
*val = r.Add
//.........這裏部分代碼省略.........
示例3: machoreloc1
func machoreloc1(r *ld.Reloc, sectoff int64) int {
var v uint32
rs := r.Xsym
// ld64 has a bug handling MACHO_ARM64_RELOC_UNSIGNED with !extern relocation.
// see cmd/internal/ld/data.go for details. The workarond is that don't use !extern
// UNSIGNED relocation at all.
if rs.Type == obj.SHOSTOBJ || r.Type == obj.R_CALLARM64 || r.Type == obj.R_ADDRARM64 || r.Type == obj.R_ADDR {
if rs.Dynid < 0 {
ld.Diag("reloc %d to non-macho symbol %s type=%d", r.Type, rs.Name, rs.Type)
return -1
}
v = uint32(rs.Dynid)
v |= 1 << 27 // external relocation
} else {
v = uint32(rs.Sect.Extnum)
if v == 0 {
ld.Diag("reloc %d to symbol %s in non-macho section %s type=%d", r.Type, rs.Name, rs.Sect.Name, rs.Type)
return -1
}
}
switch r.Type {
default:
return -1
case obj.R_ADDR:
v |= ld.MACHO_ARM64_RELOC_UNSIGNED << 28
case obj.R_CALLARM64:
if r.Xadd != 0 {
ld.Diag("ld64 doesn't allow BR26 reloc with non-zero addend: %s+%d", rs.Name, r.Xadd)
}
v |= 1 << 24 // pc-relative bit
v |= ld.MACHO_ARM64_RELOC_BRANCH26 << 28
case obj.R_ADDRARM64:
r.Siz = 4
// Two relocation entries: MACHO_ARM64_RELOC_PAGEOFF12 MACHO_ARM64_RELOC_PAGE21
// if r.Xadd is non-zero, add two MACHO_ARM64_RELOC_ADDEND.
if r.Xadd != 0 {
ld.Thearch.Lput(uint32(sectoff + 4))
ld.Thearch.Lput((ld.MACHO_ARM64_RELOC_ADDEND << 28) | (2 << 25) | uint32(r.Xadd&0xffffff))
}
ld.Thearch.Lput(uint32(sectoff + 4))
ld.Thearch.Lput(v | (ld.MACHO_ARM64_RELOC_PAGEOFF12 << 28) | (2 << 25))
if r.Xadd != 0 {
ld.Thearch.Lput(uint32(sectoff))
ld.Thearch.Lput((ld.MACHO_ARM64_RELOC_ADDEND << 28) | (2 << 25) | uint32(r.Xadd&0xffffff))
}
v |= 1 << 24 // pc-relative bit
v |= ld.MACHO_ARM64_RELOC_PAGE21 << 28
}
switch r.Siz {
default:
return -1
case 1:
v |= 0 << 25
case 2:
v |= 1 << 25
case 4:
v |= 2 << 25
case 8:
v |= 3 << 25
}
ld.Thearch.Lput(uint32(sectoff))
ld.Thearch.Lput(v)
return 0
}示例4: genplt
func genplt() {
var s *ld.LSym
var stub *ld.LSym
var pprevtextp **ld.LSym
var r *ld.Reloc
var n string
var o1 uint32
var i int
// The ppc64 ABI PLT has similar concepts to other
// architectures, but is laid out quite differently. When we
// see an R_PPC64_REL24 relocation to a dynamic symbol
// (indicating that the call needs to go through the PLT), we
// generate up to three stubs and reserve a PLT slot.
//
// 1) The call site will be bl x; nop (where the relocation
// applies to the bl). We rewrite this to bl x_stub; ld
// r2,24(r1). The ld is necessary because x_stub will save
// r2 (the TOC pointer) at 24(r1) (the "TOC save slot").
//
// 2) We reserve space for a pointer in the .plt section (once
// per referenced dynamic function). .plt is a data
// section filled solely by the dynamic linker (more like
// .plt.got on other architectures). Initially, the
// dynamic linker will fill each slot with a pointer to the
// corresponding [email protected] entry point.
//
// 3) We generate the "call stub" x_stub (once per dynamic
// function/object file pair). This saves the TOC in the
// TOC save slot, reads the function pointer from x's .plt
// slot and calls it like any other global entry point
// (including setting r12 to the function address).
//
// 4) We generate the "symbol resolver stub" [email protected] (once per
// dynamic function). This is solely a branch to the glink
// resolver stub.
//
// 5) We generate the glink resolver stub (only once). This
// computes which symbol resolver stub we came through and
// invokes the dynamic resolver via a pointer provided by
// the dynamic linker. This will patch up the .plt slot to
// point directly at the function so future calls go
// straight from the call stub to the real function, and
// then call the function.
// NOTE: It's possible we could make ppc64 closer to other
// architectures: ppc64's .plt is like .plt.got on other
// platforms and ppc64's .glink is like .plt on other
// platforms.
// Find all R_PPC64_REL24 relocations that reference dynamic
// imports. Reserve PLT entries for these symbols and
// generate call stubs. The call stubs need to live in .text,
// which is why we need to do this pass this early.
//
// This assumes "case 1" from the ABI, where the caller needs
// us to save and restore the TOC pointer.
pprevtextp = &ld.Ctxt.Textp
for s = *pprevtextp; s != nil; pprevtextp, s = &s.Next, s.Next {
for i = range s.R {
r = &s.R[i]
if r.Type != 256+ld.R_PPC64_REL24 || r.Sym.Type != obj.SDYNIMPORT {
continue
}
// Reserve PLT entry and generate symbol
// resolver
addpltsym(ld.Ctxt, r.Sym)
// Generate call stub
n = fmt.Sprintf("%s.%s", s.Name, r.Sym.Name)
stub = ld.Linklookup(ld.Ctxt, n, 0)
stub.Reachable = stub.Reachable || s.Reachable
if stub.Size == 0 {
// Need outer to resolve .TOC.
stub.Outer = s
// Link in to textp before s (we could
// do it after, but would have to skip
// the subsymbols)
*pprevtextp = stub
stub.Next = s
pprevtextp = &stub.Next
gencallstub(1, stub, r.Sym)
}
// Update the relocation to use the call stub
r.Sym = stub
// Restore TOC after bl. The compiler put a
// nop here for us to overwrite.
o1 = 0xe8410018 // ld r2,24(r1)
ld.Ctxt.Arch.ByteOrder.PutUint32(s.P[r.Off+4:], o1)
}
}
//.........這裏部分代碼省略.........
示例5: elfreloc1
func elfreloc1(r *ld.Reloc, sectoff int64) int {
ld.Thearch.Vput(uint64(sectoff))
elfsym := r.Xsym.ElfsymForReloc()
switch r.Type {
default:
return -1
case obj.R_ADDR:
switch r.Siz {
case 4:
ld.Thearch.Vput(ld.R_PPC64_ADDR32 | uint64(elfsym)<<32)
case 8:
ld.Thearch.Vput(ld.R_PPC64_ADDR64 | uint64(elfsym)<<32)
default:
return -1
}
case obj.R_POWER_TLS:
ld.Thearch.Vput(ld.R_PPC64_TLS | uint64(elfsym)<<32)
case obj.R_POWER_TLS_LE:
ld.Thearch.Vput(ld.R_PPC64_TPREL16 | uint64(elfsym)<<32)
case obj.R_POWER_TLS_IE:
ld.Thearch.Vput(ld.R_PPC64_GOT_TPREL16_HA | uint64(elfsym)<<32)
ld.Thearch.Vput(uint64(r.Xadd))
ld.Thearch.Vput(uint64(sectoff + 4))
ld.Thearch.Vput(ld.R_PPC64_GOT_TPREL16_LO_DS | uint64(elfsym)<<32)
case obj.R_ADDRPOWER:
ld.Thearch.Vput(ld.R_PPC64_ADDR16_HA | uint64(elfsym)<<32)
ld.Thearch.Vput(uint64(r.Xadd))
ld.Thearch.Vput(uint64(sectoff + 4))
ld.Thearch.Vput(ld.R_PPC64_ADDR16_LO | uint64(elfsym)<<32)
case obj.R_ADDRPOWER_DS:
ld.Thearch.Vput(ld.R_PPC64_ADDR16_HA | uint64(elfsym)<<32)
ld.Thearch.Vput(uint64(r.Xadd))
ld.Thearch.Vput(uint64(sectoff + 4))
ld.Thearch.Vput(ld.R_PPC64_ADDR16_LO_DS | uint64(elfsym)<<32)
case obj.R_ADDRPOWER_GOT:
ld.Thearch.Vput(ld.R_PPC64_GOT16_HA | uint64(elfsym)<<32)
ld.Thearch.Vput(uint64(r.Xadd))
ld.Thearch.Vput(uint64(sectoff + 4))
ld.Thearch.Vput(ld.R_PPC64_GOT16_LO_DS | uint64(elfsym)<<32)
case obj.R_ADDRPOWER_PCREL:
ld.Thearch.Vput(ld.R_PPC64_REL16_HA | uint64(elfsym)<<32)
ld.Thearch.Vput(uint64(r.Xadd))
ld.Thearch.Vput(uint64(sectoff + 4))
ld.Thearch.Vput(ld.R_PPC64_REL16_LO | uint64(elfsym)<<32)
r.Xadd += 4
case obj.R_ADDRPOWER_TOCREL:
ld.Thearch.Vput(ld.R_PPC64_TOC16_HA | uint64(elfsym)<<32)
ld.Thearch.Vput(uint64(r.Xadd))
ld.Thearch.Vput(uint64(sectoff + 4))
ld.Thearch.Vput(ld.R_PPC64_TOC16_LO | uint64(elfsym)<<32)
case obj.R_ADDRPOWER_TOCREL_DS:
ld.Thearch.Vput(ld.R_PPC64_TOC16_HA | uint64(elfsym)<<32)
ld.Thearch.Vput(uint64(r.Xadd))
ld.Thearch.Vput(uint64(sectoff + 4))
ld.Thearch.Vput(ld.R_PPC64_TOC16_LO_DS | uint64(elfsym)<<32)
case obj.R_CALLPOWER:
if r.Siz != 4 {
return -1
}
ld.Thearch.Vput(ld.R_PPC64_REL24 | uint64(elfsym)<<32)
}
ld.Thearch.Vput(uint64(r.Xadd))
return 0
}