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/avail/ld/data.go for details. The workaround 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 }