| ... | ... | @@ -768,6 +768,14 @@ pub fn resolveRelocsAlloc(self: Atom, elf_file: *Elf, code: []u8) RelocError!voi |
| 768 | 768 | => has_reloc_errors = true, |
| 769 | 769 | else => |e| return e, |
| 770 | 770 | }, |
| 771 | .aarch64 => aarch64.resolveRelocAlloc(self, elf_file, rel, target, args, &it, code, &stream) catch |err| switch (err) { |
| 772 | error.RelocFailure, |
| 773 | error.RelaxFailure, |
| 774 | error.UnexpectedRemainder, |
| 775 | error.DivisionByZero, |
| 776 | => has_reloc_errors = true, |
| 777 | else => |e| return e, |
| 778 | }, |
| 771 | 779 | else => return error.UnsupportedCpuArch, |
| 772 | 780 | } |
| 773 | 781 | } |
| ... | ... | @@ -1606,6 +1614,117 @@ const aarch64 = struct { |
| 1606 | 1614 | else => try atom.reportUnhandledRelocError(rel, elf_file), |
| 1607 | 1615 | } |
| 1608 | 1616 | } |
| 1617 | |
| 1618 | fn resolveRelocAlloc( |
| 1619 | atom: Atom, |
| 1620 | elf_file: *Elf, |
| 1621 | rel: elf.Elf64_Rela, |
| 1622 | target: *const Symbol, |
| 1623 | args: ResolveArgs, |
| 1624 | it: *RelocsIterator, |
| 1625 | code: []u8, |
| 1626 | stream: anytype, |
| 1627 | ) (error{ UnexpectedRemainder, DivisionByZero } || RelocError)!void { |
| 1628 | _ = it; |
| 1629 | |
| 1630 | const r_type: elf.R_AARCH64 = @enumFromInt(rel.r_type()); |
| 1631 | const r_offset = std.math.cast(usize, rel.r_offset) orelse return error.Overflow; |
| 1632 | |
| 1633 | try stream.seekTo(r_offset); |
| 1634 | const cwriter = stream.writer(); |
| 1635 | |
| 1636 | const P, const A, const S, const GOT, const G, const TP, const DTP, const ZIG_GOT = args; |
| 1637 | _ = TP; |
| 1638 | _ = DTP; |
| 1639 | _ = ZIG_GOT; |
| 1640 | |
| 1641 | switch (r_type) { |
| 1642 | .NONE => unreachable, |
| 1643 | .ABS64 => { |
| 1644 | try atom.resolveDynAbsReloc( |
| 1645 | target, |
| 1646 | rel, |
| 1647 | dynAbsRelocAction(target, elf_file), |
| 1648 | elf_file, |
| 1649 | cwriter, |
| 1650 | ); |
| 1651 | }, |
| 1652 | |
| 1653 | .CALL26, |
| 1654 | .JUMP26, |
| 1655 | => { |
| 1656 | // TODO: add thunk support |
| 1657 | const disp: i28 = math.cast(i28, S + A - P) orelse { |
| 1658 | var err = try elf_file.addErrorWithNotes(1); |
| 1659 | try err.addMsg(elf_file, "TODO: branch relocation target ({s}) exceeds max jump distance", .{ |
| 1660 | target.name(elf_file), |
| 1661 | }); |
| 1662 | try err.addNote(elf_file, "in {}:{s} at offset 0x{x}", .{ |
| 1663 | atom.file(elf_file).?.fmtPath(), |
| 1664 | atom.name(elf_file), |
| 1665 | r_offset, |
| 1666 | }); |
| 1667 | return; |
| 1668 | }; |
| 1669 | try aarch64_util.writeBranchImm(disp, code[r_offset..][0..4]); |
| 1670 | }, |
| 1671 | |
| 1672 | .ADR_PREL_PG_HI21 => { |
| 1673 | // TODO: check for relaxation of ADRP+ADD |
| 1674 | const saddr = @as(u64, @intCast(P)); |
| 1675 | const taddr = @as(u64, @intCast(S + A)); |
| 1676 | const pages = @as(u21, @bitCast(try aarch64_util.calcNumberOfPages(saddr, taddr))); |
| 1677 | try aarch64_util.writePages(pages, code[r_offset..][0..4]); |
| 1678 | }, |
| 1679 | |
| 1680 | .ADR_GOT_PAGE => if (target.flags.has_got) { |
| 1681 | const saddr = @as(u64, @intCast(P)); |
| 1682 | const taddr = @as(u64, @intCast(G + GOT + A)); |
| 1683 | const pages = @as(u21, @bitCast(try aarch64_util.calcNumberOfPages(saddr, taddr))); |
| 1684 | try aarch64_util.writePages(pages, code[r_offset..][0..4]); |
| 1685 | } else { |
| 1686 | // TODO: relax |
| 1687 | var err = try elf_file.addErrorWithNotes(1); |
| 1688 | try err.addMsg(elf_file, "TODO: relax ADR_GOT_PAGE", .{}); |
| 1689 | try err.addNote(elf_file, "in {}:{s} at offset 0x{x}", .{ |
| 1690 | atom.file(elf_file).?.fmtPath(), |
| 1691 | atom.name(elf_file), |
| 1692 | r_offset, |
| 1693 | }); |
| 1694 | }, |
| 1695 | |
| 1696 | .LD64_GOT_LO12_NC => { |
| 1697 | assert(target.flags.has_got); |
| 1698 | const taddr = @as(u64, @intCast(G + GOT + A)); |
| 1699 | try aarch64_util.writePageOffset(.load_store_64, taddr, code[r_offset..][0..4]); |
| 1700 | }, |
| 1701 | |
| 1702 | .ADD_ABS_LO12_NC, |
| 1703 | .LDST8_ABS_LO12_NC, |
| 1704 | .LDST16_ABS_LO12_NC, |
| 1705 | .LDST32_ABS_LO12_NC, |
| 1706 | .LDST64_ABS_LO12_NC, |
| 1707 | .LDST128_ABS_LO12_NC, |
| 1708 | => { |
| 1709 | // TODO: NC means no overflow check |
| 1710 | const taddr = @as(u64, @intCast(S + A)); |
| 1711 | const kind: aarch64_util.PageOffsetInstKind = switch (r_type) { |
| 1712 | .ADD_ABS_LO12_NC => .arithmetic, |
| 1713 | .LDST8_ABS_LO12_NC => .load_store_8, |
| 1714 | .LDST16_ABS_LO12_NC => .load_store_16, |
| 1715 | .LDST32_ABS_LO12_NC => .load_store_32, |
| 1716 | .LDST64_ABS_LO12_NC => .load_store_64, |
| 1717 | .LDST128_ABS_LO12_NC => .load_store_128, |
| 1718 | else => unreachable, |
| 1719 | }; |
| 1720 | try aarch64_util.writePageOffset(kind, taddr, code[r_offset..][0..4]); |
| 1721 | }, |
| 1722 | |
| 1723 | else => try atom.reportUnhandledRelocError(rel, elf_file), |
| 1724 | } |
| 1725 | } |
| 1726 | |
| 1727 | const aarch64_util = @import("../aarch64.zig"); |
| 1609 | 1728 | }; |
| 1610 | 1729 | |
| 1611 | 1730 | const ResolveArgs = struct { i64, i64, i64, i64, i64, i64, i64, i64 }; |
| ... | ... | @@ -1647,6 +1766,7 @@ const assert = std.debug.assert; |
| 1647 | 1766 | const elf = std.elf; |
| 1648 | 1767 | const eh_frame = @import("eh_frame.zig"); |
| 1649 | 1768 | const log = std.log.scoped(.link); |
| 1769 | const math = std.math; |
| 1650 | 1770 | const relocs_log = std.log.scoped(.link_relocs); |
| 1651 | 1771 | const relocation = @import("relocation.zig"); |
| 1652 | 1772 | |
Jakub Konka <kubkon@jakubkonka.com> 2024-02-21 22:22:40+01:00
src