Golang ld.Linklookup函數代碼示例

本文整理匯總了Golang中cmd/internal/ld.Linklookup函數的典型用法代碼示例。如果您正苦於以下問題：Golang Linklookup函數的具體用法？Golang Linklookup怎麽用？Golang Linklookup使用的例子？那麽, 這裏精選的函數代碼示例或許可以為您提供幫助。

在下文中一共展示了Linklookup函數的15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: elfsetupplt

func elfsetupplt() {
	plt := ld.Linklookup(ld.Ctxt, ".plt", 0)
	got := ld.Linklookup(ld.Ctxt, ".got.plt", 0)
	if plt.Size == 0 {
		// pushl got+4
		ld.Adduint8(ld.Ctxt, plt, 0xff)

		ld.Adduint8(ld.Ctxt, plt, 0x35)
		ld.Addaddrplus(ld.Ctxt, plt, got, 4)

		// jmp *got+8
		ld.Adduint8(ld.Ctxt, plt, 0xff)

		ld.Adduint8(ld.Ctxt, plt, 0x25)
		ld.Addaddrplus(ld.Ctxt, plt, got, 8)

		// zero pad
		ld.Adduint32(ld.Ctxt, plt, 0)

		// assume got->size == 0 too
		ld.Addaddrplus(ld.Ctxt, got, ld.Linklookup(ld.Ctxt, ".dynamic", 0), 0)

		ld.Adduint32(ld.Ctxt, got, 0)
		ld.Adduint32(ld.Ctxt, got, 0)
	}
}

開發者ID:xslonepiece，項目名稱:goios，代碼行數:26，代碼來源:asm.go

示例2: ensureglinkresolver

// Generate the glink resolver stub if necessary and return the .glink section
func ensureglinkresolver() *ld.LSym {
	glink := ld.Linklookup(ld.Ctxt, ".glink", 0)
	if glink.Size != 0 {
		return glink
	}

	// This is essentially the resolver from the ppc64 ELF ABI.
	// At entry, r12 holds the address of the symbol resolver stub
	// for the target routine and the argument registers hold the
	// arguments for the target routine.
	//
	// This stub is PIC, so first get the PC of label 1 into r11.
	// Other things will be relative to this.
	ld.Adduint32(ld.Ctxt, glink, 0x7c0802a6) // mflr r0
	ld.Adduint32(ld.Ctxt, glink, 0x429f0005) // bcl 20,31,1f
	ld.Adduint32(ld.Ctxt, glink, 0x7d6802a6) // 1: mflr r11
	ld.Adduint32(ld.Ctxt, glink, 0x7c0803a6) // mtlf r0

	// Compute the .plt array index from the entry point address.
	// Because this is PIC, everything is relative to label 1b (in
	// r11):
	//   r0 = ((r12 - r11) - (res_0 - r11)) / 4 = (r12 - res_0) / 4
	ld.Adduint32(ld.Ctxt, glink, 0x3800ffd0) // li r0,-(res_0-1b)=-48
	ld.Adduint32(ld.Ctxt, glink, 0x7c006214) // add r0,r0,r12
	ld.Adduint32(ld.Ctxt, glink, 0x7c0b0050) // sub r0,r0,r11
	ld.Adduint32(ld.Ctxt, glink, 0x7800f082) // srdi r0,r0,2

	// r11 = address of the first byte of the PLT
	r := ld.Addrel(glink)

	r.Off = int32(glink.Size)
	r.Sym = ld.Linklookup(ld.Ctxt, ".plt", 0)
	r.Siz = 8
	r.Type = ld.R_ADDRPOWER

	// addis r11,0,[email protected]; addi r11,r11,[email protected]
	r.Add = 0x3d600000<<32 | 0x396b0000

	glink.Size += 8

	// Load r12 = dynamic resolver address and r11 = DSO
	// identifier from the first two doublewords of the PLT.
	ld.Adduint32(ld.Ctxt, glink, 0xe98b0000) // ld r12,0(r11)
	ld.Adduint32(ld.Ctxt, glink, 0xe96b0008) // ld r11,8(r11)

	// Jump to the dynamic resolver
	ld.Adduint32(ld.Ctxt, glink, 0x7d8903a6) // mtctr r12
	ld.Adduint32(ld.Ctxt, glink, 0x4e800420) // bctr

	// The symbol resolvers must immediately follow.
	//   res_0:

	// Add DT_PPC64_GLINK .dynamic entry, which points to 32 bytes
	// before the first symbol resolver stub.
	s := ld.Linklookup(ld.Ctxt, ".dynamic", 0)

	ld.Elfwritedynentsymplus(s, ld.DT_PPC64_GLINK, glink, glink.Size-32)

	return glink
}

開發者ID:klueska，項目名稱:go-akaros，代碼行數:61，代碼來源:asm.go

示例3: elfsetupplt

func elfsetupplt() {
	plt := ld.Linklookup(ld.Ctxt, ".plt", 0)
	got := ld.Linklookup(ld.Ctxt, ".got.plt", 0)
	if plt.Size == 0 {
		// pushq got+8(IP)
		ld.Adduint8(ld.Ctxt, plt, 0xff)

		ld.Adduint8(ld.Ctxt, plt, 0x35)
		ld.Addpcrelplus(ld.Ctxt, plt, got, 8)

		// jmpq got+16(IP)
		ld.Adduint8(ld.Ctxt, plt, 0xff)

		ld.Adduint8(ld.Ctxt, plt, 0x25)
		ld.Addpcrelplus(ld.Ctxt, plt, got, 16)

		// nopl 0(AX)
		ld.Adduint32(ld.Ctxt, plt, 0x00401f0f)

		// assume got->size == 0 too
		ld.Addaddrplus(ld.Ctxt, got, ld.Linklookup(ld.Ctxt, ".dynamic", 0), 0)

		ld.Adduint64(ld.Ctxt, got, 0)
		ld.Adduint64(ld.Ctxt, got, 0)
	}
}

開發者ID:tidatida，項目名稱:go，代碼行數:26，代碼來源:asm.go

示例4: adddynsym

func adddynsym(ctxt *ld.Link, s *ld.LSym) {
	if s.Dynid >= 0 {
		return
	}

	if ld.Iself {
		s.Dynid = int32(ld.Nelfsym)
		ld.Nelfsym++

		d := ld.Linklookup(ctxt, ".dynsym", 0)

		name := s.Extname
		ld.Adduint32(ctxt, d, uint32(ld.Addstring(ld.Linklookup(ctxt, ".dynstr", 0), name)))

		/* type */
		t := ld.STB_GLOBAL << 4

		if s.Cgoexport != 0 && s.Type&ld.SMASK == ld.STEXT {
			t |= ld.STT_FUNC
		} else {
			t |= ld.STT_OBJECT
		}
		ld.Adduint8(ctxt, d, uint8(t))

		/* reserved */
		ld.Adduint8(ctxt, d, 0)

		/* section where symbol is defined */
		if s.Type == ld.SDYNIMPORT {
			ld.Adduint16(ctxt, d, ld.SHN_UNDEF)
		} else {
			ld.Adduint16(ctxt, d, 1)
		}

		/* value */
		if s.Type == ld.SDYNIMPORT {
			ld.Adduint64(ctxt, d, 0)
		} else {
			ld.Addaddr(ctxt, d, s)
		}

		/* size of object */
		ld.Adduint64(ctxt, d, uint64(s.Size))

		if s.Cgoexport&ld.CgoExportDynamic == 0 && s.Dynimplib != "" && needlib(s.Dynimplib) != 0 {
			ld.Elfwritedynent(ld.Linklookup(ctxt, ".dynamic", 0), ld.DT_NEEDED, uint64(ld.Addstring(ld.Linklookup(ctxt, ".dynstr", 0), s.Dynimplib)))
		}
	} else if ld.HEADTYPE == ld.Hdarwin {
		ld.Diag("adddynsym: missed symbol %s (%s)", s.Name, s.Extname)
	} else if ld.HEADTYPE == ld.Hwindows {
	} else // already taken care of
	{
		ld.Diag("adddynsym: unsupported binary format")
	}
}

開發者ID:tidatida，項目名稱:go，代碼行數:55，代碼來源:asm.go

示例5: adddynsym

func adddynsym(ctxt *ld.Link, s *ld.LSym) {
	if s.Dynid >= 0 {
		return
	}

	if ld.Iself {
		s.Dynid = int32(ld.Nelfsym)
		ld.Nelfsym++

		d := ld.Linklookup(ctxt, ".dynsym", 0)

		/* name */
		name := s.Extname

		ld.Adduint32(ctxt, d, uint32(ld.Addstring(ld.Linklookup(ctxt, ".dynstr", 0), name)))

		/* value */
		if s.Type == ld.SDYNIMPORT {
			ld.Adduint32(ctxt, d, 0)
		} else {
			ld.Addaddr(ctxt, d, s)
		}

		/* size */
		ld.Adduint32(ctxt, d, 0)

		/* type */
		t := ld.STB_GLOBAL << 4

		if s.Cgoexport != 0 && s.Type&ld.SMASK == ld.STEXT {
			t |= ld.STT_FUNC
		} else {
			t |= ld.STT_OBJECT
		}
		ld.Adduint8(ctxt, d, uint8(t))
		ld.Adduint8(ctxt, d, 0)

		/* shndx */
		if s.Type == ld.SDYNIMPORT {
			ld.Adduint16(ctxt, d, ld.SHN_UNDEF)
		} else {
			ld.Adduint16(ctxt, d, 1)
		}
	} else if ld.HEADTYPE == ld.Hdarwin {
		ld.Diag("adddynsym: missed symbol %s (%s)", s.Name, s.Extname)
	} else if ld.HEADTYPE == ld.Hwindows {
	} else // already taken care of
	{
		ld.Diag("adddynsym: unsupported binary format")
	}
}

開發者ID:xslonepiece，項目名稱:goios，代碼行數:51，代碼來源:asm.go

示例6: adddynlib

func adddynlib(lib string) {
	if needlib(lib) == 0 {
		return
	}

	if ld.Iself {
		s := ld.Linklookup(ld.Ctxt, ".dynstr", 0)
		if s.Size == 0 {
			ld.Addstring(s, "")
		}
		ld.Elfwritedynent(ld.Linklookup(ld.Ctxt, ".dynamic", 0), ld.DT_NEEDED, uint64(ld.Addstring(s, lib)))
	} else {
		ld.Diag("adddynlib: unsupported binary format")
	}
}

開發者ID:klueska，項目名稱:go-akaros，代碼行數:15，代碼來源:asm.go

示例7: adddynsym

func adddynsym(ctxt *ld.Link, s *ld.LSym) {
	if s.Dynid >= 0 {
		return
	}

	if ld.Iself {
		s.Dynid = int32(ld.Nelfsym)
		ld.Nelfsym++

		d := ld.Linklookup(ctxt, ".dynsym", 0)

		name := s.Extname
		ld.Adduint32(ctxt, d, uint32(ld.Addstring(ld.Linklookup(ctxt, ".dynstr", 0), name)))

		/* type */
		t := ld.STB_GLOBAL << 4

		if s.Cgoexport != 0 && s.Type&ld.SMASK == ld.STEXT {
			t |= ld.STT_FUNC
		} else {
			t |= ld.STT_OBJECT
		}
		ld.Adduint8(ctxt, d, uint8(t))

		/* reserved */
		ld.Adduint8(ctxt, d, 0)

		/* section where symbol is defined */
		if s.Type == ld.SDYNIMPORT {
			ld.Adduint16(ctxt, d, ld.SHN_UNDEF)
		} else {
			ld.Adduint16(ctxt, d, 1)
		}

		/* value */
		if s.Type == ld.SDYNIMPORT {
			ld.Adduint64(ctxt, d, 0)
		} else {
			ld.Addaddr(ctxt, d, s)
		}

		/* size of object */
		ld.Adduint64(ctxt, d, uint64(s.Size))
	} else {
		ld.Diag("adddynsym: unsupported binary format")
	}
}

開發者ID:klueska，項目名稱:go-akaros，代碼行數:47，代碼來源:asm.go

示例8: addgotsym

func addgotsym(ctxt *ld.Link, s *ld.LSym) {
	if s.Got >= 0 {
		return
	}

	adddynsym(ctxt, s)
	got := ld.Linklookup(ctxt, ".got", 0)
	s.Got = int32(got.Size)
	ld.Adduint32(ctxt, got, 0)

	if ld.Iself {
		rel := ld.Linklookup(ctxt, ".rel", 0)
		ld.Addaddrplus(ctxt, rel, got, int64(s.Got))
		ld.Adduint32(ctxt, rel, ld.ELF32_R_INFO(uint32(s.Dynid), ld.R_ARM_GLOB_DAT))
	} else {
		ld.Diag("addgotsym: unsupported binary format")
	}
}

開發者ID:xslonepiece，項目名稱:goios，代碼行數:18，代碼來源:asm.go

示例9: addpltsym

func addpltsym(ctxt *ld.Link, s *ld.LSym) {
	if s.Plt >= 0 {
		return
	}

	adddynsym(ctxt, s)

	if ld.Iself {
		plt := ld.Linklookup(ctxt, ".plt", 0)
		rela := ld.Linklookup(ctxt, ".rela.plt", 0)
		if plt.Size == 0 {
			elfsetupplt()
		}

		// Create the glink resolver if necessary
		glink := ensureglinkresolver()

		// Write symbol resolver stub (just a branch to the
		// glink resolver stub)
		r := ld.Addrel(glink)

		r.Sym = glink
		r.Off = int32(glink.Size)
		r.Siz = 4
		r.Type = ld.R_CALLPOWER
		ld.Adduint32(ctxt, glink, 0x48000000) // b .glink

		// In the ppc64 ABI, the dynamic linker is responsible
		// for writing the entire PLT.  We just need to
		// reserve 8 bytes for each PLT entry and generate a
		// JMP_SLOT dynamic relocation for it.
		//
		// TODO(austin): ABI v1 is different
		s.Plt = int32(plt.Size)

		plt.Size += 8

		ld.Addaddrplus(ctxt, rela, plt, int64(s.Plt))
		ld.Adduint64(ctxt, rela, ld.ELF64_R_INFO(uint32(s.Dynid), ld.R_PPC64_JMP_SLOT))
		ld.Adduint64(ctxt, rela, 0)
	} else {
		ld.Diag("addpltsym: unsupported binary format")
	}
}

開發者ID:klueska，項目名稱:go-akaros，代碼行數:44，代碼來源:asm.go

示例10: gentext

func gentext() {
	if !ld.DynlinkingGo() {
		return
	}
	addmoduledata := ld.Linklookup(ld.Ctxt, "runtime.addmoduledata", 0)
	if addmoduledata.Type == ld.STEXT {
		// we're linking a module containing the runtime -> no need for
		// an init function
		return
	}
	addmoduledata.Reachable = true
	initfunc := ld.Linklookup(ld.Ctxt, "go.link.addmoduledata", 0)
	initfunc.Type = ld.STEXT
	initfunc.Local = true
	initfunc.Reachable = true
	o := func(op ...uint8) {
		for _, op1 := range op {
			ld.Adduint8(ld.Ctxt, initfunc, op1)
		}
	}
	// 0000000000000000 <local.dso_init>:
	//    0:	48 8d 3d 00 00 00 00 	lea    0x0(%rip),%rdi        # 7 <local.dso_init+0x7>
	// 			3: R_X86_64_PC32	runtime.firstmoduledata-0x4
	o(0x48, 0x8d, 0x3d)
	ld.Addpcrelplus(ld.Ctxt, initfunc, ld.Linklookup(ld.Ctxt, "runtime.firstmoduledata", 0), 0)
	//    7:	e8 00 00 00 00       	callq  c <local.dso_init+0xc>
	// 			8: R_X86_64_PLT32	runtime.addmoduledata-0x4
	o(0xe8)
	Addcall(ld.Ctxt, initfunc, addmoduledata)
	//    c:	c3                   	retq
	o(0xc3)
	if ld.Ctxt.Etextp != nil {
		ld.Ctxt.Etextp.Next = initfunc
	} else {
		ld.Ctxt.Textp = initfunc
	}
	ld.Ctxt.Etextp = initfunc
	initarray_entry := ld.Linklookup(ld.Ctxt, "go.link.addmoduledatainit", 0)
	initarray_entry.Reachable = true
	initarray_entry.Local = true
	initarray_entry.Type = ld.SINITARR
	ld.Addaddr(ld.Ctxt, initarray_entry, initfunc)
}

開發者ID:xslonepiece，項目名稱:goios，代碼行數:43，代碼來源:asm.go

示例11: elfsetupplt

func elfsetupplt() {
	plt := ld.Linklookup(ld.Ctxt, ".plt", 0)
	if plt.Size == 0 {
		// The dynamic linker stores the address of the
		// dynamic resolver and the DSO identifier in the two
		// doublewords at the beginning of the .plt section
		// before the PLT array.  Reserve space for these.
		plt.Size = 16
	}
}

開發者ID:klueska，項目名稱:go-akaros，代碼行數:10，代碼來源:asm.go

示例12: addgotsym

func addgotsym(s *ld.LSym) {
	if s.Got >= 0 {
		return
	}

	adddynsym(ld.Ctxt, s)
	got := ld.Linklookup(ld.Ctxt, ".got", 0)
	s.Got = int32(got.Size)
	ld.Adduint64(ld.Ctxt, got, 0)

	if ld.Iself {
		rela := ld.Linklookup(ld.Ctxt, ".rela", 0)
		ld.Addaddrplus(ld.Ctxt, rela, got, int64(s.Got))
		ld.Adduint64(ld.Ctxt, rela, ld.ELF64_R_INFO(uint32(s.Dynid), ld.R_X86_64_GLOB_DAT))
		ld.Adduint64(ld.Ctxt, rela, 0)
	} else if ld.HEADTYPE == ld.Hdarwin {
		ld.Adduint32(ld.Ctxt, ld.Linklookup(ld.Ctxt, ".linkedit.got", 0), uint32(s.Dynid))
	} else {
		ld.Diag("addgotsym: unsupported binary format")
	}
}

開發者ID:tidatida，項目名稱:go，代碼行數:21，代碼來源:asm.go

示例13: addpltsym

func addpltsym(ctxt *ld.Link, s *ld.LSym) {
	if s.Plt >= 0 {
		return
	}

	adddynsym(ctxt, s)

	if ld.Iself {
		plt := ld.Linklookup(ctxt, ".plt", 0)
		got := ld.Linklookup(ctxt, ".got.plt", 0)
		rel := ld.Linklookup(ctxt, ".rel.plt", 0)
		if plt.Size == 0 {
			elfsetupplt()
		}

		// jmpq *got+size
		ld.Adduint8(ctxt, plt, 0xff)

		ld.Adduint8(ctxt, plt, 0x25)
		ld.Addaddrplus(ctxt, plt, got, got.Size)

		// add to got: pointer to current pos in plt
		ld.Addaddrplus(ctxt, got, plt, plt.Size)

		// pushl $x
		ld.Adduint8(ctxt, plt, 0x68)

		ld.Adduint32(ctxt, plt, uint32(rel.Size))

		// jmp .plt
		ld.Adduint8(ctxt, plt, 0xe9)

		ld.Adduint32(ctxt, plt, uint32(-(plt.Size + 4)))

		// rel
		ld.Addaddrplus(ctxt, rel, got, got.Size-4)

		ld.Adduint32(ctxt, rel, ld.ELF32_R_INFO(uint32(s.Dynid), ld.R_386_JMP_SLOT))

		s.Plt = int32(plt.Size - 16)
	} else if ld.HEADTYPE == ld.Hdarwin {
		// Same laziness as in 6l.

		plt := ld.Linklookup(ctxt, ".plt", 0)

		addgotsym(ctxt, s)

		ld.Adduint32(ctxt, ld.Linklookup(ctxt, ".linkedit.plt", 0), uint32(s.Dynid))

		// jmpq *got+size(IP)
		s.Plt = int32(plt.Size)

		ld.Adduint8(ctxt, plt, 0xff)
		ld.Adduint8(ctxt, plt, 0x25)
		ld.Addaddrplus(ctxt, plt, ld.Linklookup(ctxt, ".got", 0), int64(s.Got))
	} else {
		ld.Diag("addpltsym: unsupported binary format")
	}
}

開發者ID:xslonepiece，項目名稱:goios，代碼行數:59，代碼來源:asm.go

示例14: addgotsyminternal

func addgotsyminternal(ctxt *ld.Link, s *ld.LSym) {
	if s.Got >= 0 {
		return
	}

	got := ld.Linklookup(ctxt, ".got", 0)
	s.Got = int32(got.Size)

	ld.Addaddrplus(ctxt, got, s, 0)

	if ld.Iself {
	} else {
		ld.Diag("addgotsyminternal: unsupported binary format")
	}
}

開發者ID:xslonepiece，項目名稱:goios，代碼行數:15，代碼來源:asm.go

示例15: archreloc

func archreloc(r *ld.Reloc, s *ld.LSym, val *int64) int {
	if ld.Linkmode == ld.LinkExternal {
		return -1
	}
	switch r.Type {
	case ld.R_CONST:
		*val = r.Add
		return 0

	case ld.R_GOTOFF:
		*val = ld.Symaddr(r.Sym) + r.Add - ld.Symaddr(ld.Linklookup(ld.Ctxt, ".got", 0))
		return 0
	}

	return -1
}

開發者ID:xslonepiece，項目名稱:goios，代碼行數:16，代碼來源:asm.go

注：本文中的cmd/internal/ld.Linklookup函數示例由純淨天空整理自Github/MSDocs等開源代碼及文檔管理平台，相關代碼片段篩選自各路編程大神貢獻的開源項目，源碼版權歸原作者所有，傳播和使用請參考對應項目的License；未經允許，請勿轉載。