func genaddmoduledata() { addmoduledata := ld.Linkrlookup(ld.Ctxt, "runtime.addmoduledata", 0) if addmoduledata.Type == obj.STEXT { return } addmoduledata.Attr |= ld.AttrReachable initfunc := ld.Linklookup(ld.Ctxt, "go.link.addmoduledata", 0) initfunc.Type = obj.STEXT initfunc.Attr |= ld.AttrLocal initfunc.Attr |= ld.AttrReachable o := func(op uint32) { ld.Adduint32(ld.Ctxt, initfunc, op) } // addis r2, r12, .TOC.-func@ha rel := ld.Addrel(initfunc) rel.Off = int32(initfunc.Size) rel.Siz = 8 rel.Sym = ld.Linklookup(ld.Ctxt, ".TOC.", 0) rel.Type = obj.R_ADDRPOWER_PCREL o(0x3c4c0000) // addi r2, r2, .TOC.-func@l o(0x38420000) // mflr r31 o(0x7c0802a6) // stdu r31, -32(r1) o(0xf801ffe1) // addis r3, r2, local.moduledata@got@ha rel = ld.Addrel(initfunc) rel.Off = int32(initfunc.Size) rel.Siz = 8 rel.Sym = ld.Linklookup(ld.Ctxt, "local.moduledata", 0) rel.Type = obj.R_ADDRPOWER_GOT o(0x3c620000) // ld r3, local.moduledata@got@l(r3) o(0xe8630000) // bl runtime.addmoduledata rel = ld.Addrel(initfunc) rel.Off = int32(initfunc.Size) rel.Siz = 4 rel.Sym = addmoduledata rel.Type = obj.R_CALLPOWER o(0x48000001) // nop o(0x60000000) // ld r31, 0(r1) o(0xe8010000) // mtlr r31 o(0x7c0803a6) // addi r1,r1,32 o(0x38210020) // blr o(0x4e800020) ld.Ctxt.Textp = append(ld.Ctxt.Textp, initfunc) initarray_entry := ld.Linklookup(ld.Ctxt, "go.link.addmoduledatainit", 0) initarray_entry.Attr |= ld.AttrReachable initarray_entry.Attr |= ld.AttrLocal initarray_entry.Type = obj.SINITARR ld.Addaddr(ld.Ctxt, initarray_entry, initfunc) }
func gentext() { if !ld.DynlinkingGo() { return } addmoduledata := ld.Linklookup(ld.Ctxt, "runtime.addmoduledata", 0) if addmoduledata.Type == obj.STEXT { // we're linking a module containing the runtime -> no need for // an init function return } addmoduledata.Attr |= ld.AttrReachable initfunc := ld.Linklookup(ld.Ctxt, "go.link.addmoduledata", 0) initfunc.Type = obj.STEXT initfunc.Attr |= ld.AttrLocal initfunc.Attr |= ld.AttrReachable o := func(op uint32) { ld.Adduint32(ld.Ctxt, initfunc, op) } // 0000000000000000 <local.dso_init>: // 0: 90000000 adrp x0, 0 <runtime.firstmoduledata> // 0: R_AARCH64_ADR_PREL_PG_HI21 local.moduledata // 4: 91000000 add x0, x0, #0x0 // 4: R_AARCH64_ADD_ABS_LO12_NC local.moduledata o(0x90000000) o(0x91000000) rel := ld.Addrel(initfunc) rel.Off = 0 rel.Siz = 8 rel.Sym = ld.Ctxt.Moduledata rel.Type = obj.R_ADDRARM64 // 8: 14000000 bl 0 <runtime.addmoduledata> // 8: R_AARCH64_CALL26 runtime.addmoduledata o(0x14000000) rel = ld.Addrel(initfunc) rel.Off = 8 rel.Siz = 4 rel.Sym = ld.Linklookup(ld.Ctxt, "runtime.addmoduledata", 0) rel.Type = obj.R_CALLARM64 // Really should be R_AARCH64_JUMP26 but doesn't seem to make any difference 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.Attr |= ld.AttrReachable initarray_entry.Attr |= ld.AttrLocal initarray_entry.Type = obj.SINITARR ld.Addaddr(ld.Ctxt, initarray_entry, initfunc) }
// gentext generates assembly to append the local moduledata to the global // moduledata linked list at initialization time. This is only done if the runtime // is in a different module. // // <go.link.addmoduledata>: // larl %r2, <local.moduledata> // jg <runtime.addmoduledata@plt> // undef // // The job of appending the moduledata is delegated to runtime.addmoduledata. func gentext(ctxt *ld.Link) { if !ld.DynlinkingGo() { return } addmoduledata := ld.Linklookup(ctxt, "runtime.addmoduledata", 0) if addmoduledata.Type == obj.STEXT { // we're linking a module containing the runtime -> no need for // an init function return } addmoduledata.Attr |= ld.AttrReachable initfunc := ld.Linklookup(ctxt, "go.link.addmoduledata", 0) initfunc.Type = obj.STEXT initfunc.Attr |= ld.AttrLocal initfunc.Attr |= ld.AttrReachable // larl %r2, <local.moduledata> ld.Adduint8(ctxt, initfunc, 0xc0) ld.Adduint8(ctxt, initfunc, 0x20) lmd := ld.Addrel(initfunc) lmd.Off = int32(initfunc.Size) lmd.Siz = 4 lmd.Sym = ctxt.Moduledata lmd.Type = obj.R_PCREL lmd.Variant = ld.RV_390_DBL lmd.Add = 2 + int64(lmd.Siz) ld.Adduint32(ctxt, initfunc, 0) // jg <runtime.addmoduledata[@plt]> ld.Adduint8(ctxt, initfunc, 0xc0) ld.Adduint8(ctxt, initfunc, 0xf4) rel := ld.Addrel(initfunc) rel.Off = int32(initfunc.Size) rel.Siz = 4 rel.Sym = ld.Linklookup(ctxt, "runtime.addmoduledata", 0) rel.Type = obj.R_CALL rel.Variant = ld.RV_390_DBL rel.Add = 2 + int64(rel.Siz) ld.Adduint32(ctxt, initfunc, 0) // undef (for debugging) ld.Adduint32(ctxt, initfunc, 0) ctxt.Textp = append(ctxt.Textp, initfunc) initarray_entry := ld.Linklookup(ctxt, "go.link.addmoduledatainit", 0) initarray_entry.Attr |= ld.AttrLocal initarray_entry.Attr |= ld.AttrReachable initarray_entry.Type = obj.SINITARR ld.Addaddr(ctxt, initarray_entry, initfunc) }
func gentext() { if !ld.DynlinkingGo() { return } addmoduledata := ld.Linklookup(ld.Ctxt, "runtime.addmoduledata", 0) if addmoduledata.Type == obj.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 = obj.STEXT initfunc.Local = true initfunc.Reachable = true o := func(op uint32) { ld.Adduint32(ld.Ctxt, initfunc, op) } o(0xe59f0004) o(0xe08f0000) o(0xeafffffe) rel := ld.Addrel(initfunc) rel.Off = 8 rel.Siz = 4 rel.Sym = ld.Linklookup(ld.Ctxt, "runtime.addmoduledata", 0) rel.Type = obj.R_CALLARM rel.Add = 0xeafffffe // vomit o(0x00000000) rel = ld.Addrel(initfunc) rel.Off = 12 rel.Siz = 4 rel.Sym = ld.Ctxt.Moduledata rel.Type = obj.R_PCREL rel.Add = 4 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 = obj.SINITARR ld.Addaddr(ld.Ctxt, initarray_entry, initfunc) }
func gentext(ctxt *ld.Link) { if !ctxt.DynlinkingGo() { return } addmoduledata := ctxt.Syms.Lookup("runtime.addmoduledata", 0) if addmoduledata.Type == obj.STEXT && ld.Buildmode != ld.BuildmodePlugin { // we're linking a module containing the runtime -> no need for // an init function return } addmoduledata.Attr |= ld.AttrReachable initfunc := ctxt.Syms.Lookup("go.link.addmoduledata", 0) initfunc.Type = obj.STEXT initfunc.Attr |= ld.AttrLocal initfunc.Attr |= ld.AttrReachable o := func(op uint32) { ld.Adduint32(ctxt, initfunc, op) } o(0xe59f0004) o(0xe08f0000) o(0xeafffffe) rel := ld.Addrel(initfunc) rel.Off = 8 rel.Siz = 4 rel.Sym = ctxt.Syms.Lookup("runtime.addmoduledata", 0) rel.Type = obj.R_CALLARM rel.Add = 0xeafffffe // vomit o(0x00000000) rel = ld.Addrel(initfunc) rel.Off = 12 rel.Siz = 4 rel.Sym = ctxt.Moduledata rel.Type = obj.R_PCREL rel.Add = 4 if ld.Buildmode == ld.BuildmodePlugin { ctxt.Textp = append(ctxt.Textp, addmoduledata) } ctxt.Textp = append(ctxt.Textp, initfunc) initarray_entry := ctxt.Syms.Lookup("go.link.addmoduledatainit", 0) initarray_entry.Attr |= ld.AttrReachable initarray_entry.Attr |= ld.AttrLocal initarray_entry.Type = obj.SINITARR ld.Addaddr(ctxt, initarray_entry, initfunc) }
func gentext() { if !ld.DynlinkingGo() { return } addmoduledata := ld.Linklookup(ld.Ctxt, "runtime.addmoduledata", 0) if addmoduledata.Type == obj.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 = obj.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.Ctxt.Moduledata, 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 = obj.SINITARR ld.Addaddr(ld.Ctxt, initarray_entry, initfunc) }
func gentext(ctxt *ld.Link) { if !ctxt.DynlinkingGo() { return } addmoduledata := ctxt.Syms.Lookup("runtime.addmoduledata", 0) if addmoduledata.Type == obj.STEXT && ld.Buildmode != ld.BuildmodePlugin { // we're linking a module containing the runtime -> no need for // an init function return } addmoduledata.Attr |= ld.AttrReachable initfunc := ctxt.Syms.Lookup("go.link.addmoduledata", 0) initfunc.Type = obj.STEXT initfunc.Attr |= ld.AttrLocal initfunc.Attr |= ld.AttrReachable o := func(op ...uint8) { for _, op1 := range op { ld.Adduint8(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(ctxt, initfunc, ctxt.Moduledata, 0) // 7: e8 00 00 00 00 callq c <local.dso_init+0xc> // 8: R_X86_64_PLT32 runtime.addmoduledata-0x4 o(0xe8) Addcall(ctxt, initfunc, addmoduledata) // c: c3 retq o(0xc3) if ld.Buildmode == ld.BuildmodePlugin { ctxt.Textp = append(ctxt.Textp, addmoduledata) } ctxt.Textp = append(ctxt.Textp, initfunc) initarray_entry := ctxt.Syms.Lookup("go.link.addmoduledatainit", 0) initarray_entry.Attr |= ld.AttrReachable initarray_entry.Attr |= ld.AttrLocal initarray_entry.Type = obj.SINITARR ld.Addaddr(ctxt, initarray_entry, initfunc) }
func gentext() { if !ld.DynlinkingGo() && ld.Buildmode != ld.BuildmodePIE && ld.Buildmode != ld.BuildmodeCShared { return } thunkfunc := ld.Linklookup(ld.Ctxt, "__x86.get_pc_thunk.cx", 0) thunkfunc.Type = obj.STEXT thunkfunc.Local = true thunkfunc.Reachable = true o := func(op ...uint8) { for _, op1 := range op { ld.Adduint8(ld.Ctxt, thunkfunc, op1) } } // 8b 0c 24 mov (%esp),%ecx o(0x8b, 0x0c, 0x24) // c3 ret o(0xc3) if ld.Ctxt.Etextp != nil { ld.Ctxt.Etextp.Next = thunkfunc } else { ld.Ctxt.Textp = thunkfunc } ld.Ctxt.Etextp = thunkfunc addmoduledata := ld.Linklookup(ld.Ctxt, "runtime.addmoduledata", 0) if addmoduledata.Type == obj.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 = obj.STEXT initfunc.Local = true initfunc.Reachable = true o = func(op ...uint8) { for _, op1 := range op { ld.Adduint8(ld.Ctxt, initfunc, op1) } } // go.link.addmoduledata: // 53 push %ebx // e8 00 00 00 00 call __x86.get_pc_thunk.cx + R_CALL __x86.get_pc_thunk.cx // 8d 81 00 00 00 00 lea 0x0(%ecx), %eax + R_PCREL ld.Ctxt.Moduledata // 8d 99 00 00 00 00 lea 0x0(%ecx), %ebx + R_GOTPC _GLOBAL_OFFSET_TABLE_ // e8 00 00 00 00 call runtime.addmoduledata@plt + R_CALL runtime.addmoduledata // 5b pop %ebx // c3 ret o(0x53) o(0xe8) addcall(ld.Ctxt, initfunc, ld.Linklookup(ld.Ctxt, "__x86.get_pc_thunk.cx", 0)) o(0x8d, 0x81) ld.Addpcrelplus(ld.Ctxt, initfunc, ld.Ctxt.Moduledata, 6) o(0x8d, 0x99) i := initfunc.Size initfunc.Size += 4 ld.Symgrow(ld.Ctxt, initfunc, initfunc.Size) r := ld.Addrel(initfunc) r.Sym = ld.Linklookup(ld.Ctxt, "_GLOBAL_OFFSET_TABLE_", 0) r.Off = int32(i) r.Type = obj.R_PCREL r.Add = 12 r.Siz = 4 o(0xe8) addcall(ld.Ctxt, initfunc, addmoduledata) o(0x5b) o(0xc3) ld.Ctxt.Etextp.Next = 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 = obj.SINITARR ld.Addaddr(ld.Ctxt, initarray_entry, initfunc) }
func gentext(ctxt *ld.Link) { if !ld.DynlinkingGo() && ld.Buildmode != ld.BuildmodePIE && ld.Buildmode != ld.BuildmodeCShared { return } // Generate little thunks that load the PC of the next instruction into a register. for _, r := range [...]struct { name string num uint8 }{ {"ax", 0}, {"cx", 1}, {"dx", 2}, {"bx", 3}, // sp {"bp", 5}, {"si", 6}, {"di", 7}, } { thunkfunc := ld.Linklookup(ctxt, "__x86.get_pc_thunk."+r.name, 0) thunkfunc.Type = obj.STEXT thunkfunc.Attr |= ld.AttrLocal thunkfunc.Attr |= ld.AttrReachable //TODO: remove? o := func(op ...uint8) { for _, op1 := range op { ld.Adduint8(ctxt, thunkfunc, op1) } } // 8b 04 24 mov (%esp),%eax // Destination register is in bits 3-5 of the middle byte, so add that in. o(0x8b, 0x04+r.num<<3, 0x24) // c3 ret o(0xc3) ctxt.Textp = append(ctxt.Textp, thunkfunc) } addmoduledata := ld.Linklookup(ctxt, "runtime.addmoduledata", 0) if addmoduledata.Type == obj.STEXT { // we're linking a module containing the runtime -> no need for // an init function return } addmoduledata.Attr |= ld.AttrReachable initfunc := ld.Linklookup(ctxt, "go.link.addmoduledata", 0) initfunc.Type = obj.STEXT initfunc.Attr |= ld.AttrLocal initfunc.Attr |= ld.AttrReachable o := func(op ...uint8) { for _, op1 := range op { ld.Adduint8(ctxt, initfunc, op1) } } // go.link.addmoduledata: // 53 push %ebx // e8 00 00 00 00 call __x86.get_pc_thunk.cx + R_CALL __x86.get_pc_thunk.cx // 8d 81 00 00 00 00 lea 0x0(%ecx), %eax + R_PCREL ctxt.Moduledata // 8d 99 00 00 00 00 lea 0x0(%ecx), %ebx + R_GOTPC _GLOBAL_OFFSET_TABLE_ // e8 00 00 00 00 call runtime.addmoduledata@plt + R_CALL runtime.addmoduledata // 5b pop %ebx // c3 ret o(0x53) o(0xe8) addcall(ctxt, initfunc, ld.Linklookup(ctxt, "__x86.get_pc_thunk.cx", 0)) o(0x8d, 0x81) ld.Addpcrelplus(ctxt, initfunc, ctxt.Moduledata, 6) o(0x8d, 0x99) i := initfunc.Size initfunc.Size += 4 ld.Symgrow(ctxt, initfunc, initfunc.Size) r := ld.Addrel(initfunc) r.Sym = ld.Linklookup(ctxt, "_GLOBAL_OFFSET_TABLE_", 0) r.Off = int32(i) r.Type = obj.R_PCREL r.Add = 12 r.Siz = 4 o(0xe8) addcall(ctxt, initfunc, addmoduledata) o(0x5b) o(0xc3) ctxt.Textp = append(ctxt.Textp, initfunc) initarray_entry := ld.Linklookup(ctxt, "go.link.addmoduledatainit", 0) initarray_entry.Attr |= ld.AttrReachable initarray_entry.Attr |= ld.AttrLocal initarray_entry.Type = obj.SINITARR ld.Addaddr(ctxt, initarray_entry, initfunc) }