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x86_64: implement coff relocations
This commit is contained in:
Jacob Young
mlugg
parent
746137034e
commit
afa07f723f
@ -85269,11 +85269,7 @@ fn genBody(cg: *CodeGen, body: []const Air.Inst.Index) InnerError!void {
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.ret => try cg.airRet(inst, false),
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.ret_safe => try cg.airRet(inst, true),
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.ret_load => try cg.airRetLoad(inst),
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.store, .store_safe => |air_tag| if (use_old) try cg.airStore(inst, switch (air_tag) {
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else => unreachable,
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.store => false,
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.store_safe => true,
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}) else fallback: {
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.store, .store_safe => |air_tag| fallback: {
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const bin_op = air_datas[@intFromEnum(inst)].bin_op;
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const ptr_ty = cg.typeOf(bin_op.lhs);
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const ptr_info = ptr_ty.ptrInfo(zcu);
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@ -107,10 +107,7 @@ pub fn emitMir(emit: *Emit) Error!void {
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nav,
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emit.lower.target.*,
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)) {
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.mcv => |mcv| switch (mcv) {
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else => std.debug.panic("{s}: {}\n", .{ @src().fn_name, mcv }),
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.lea_symbol => |sym_index| sym_index,
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},
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.mcv => |mcv| mcv.lea_symbol,
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.fail => |em| {
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assert(emit.lower.err_msg == null);
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emit.lower.err_msg = em;
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@ -154,10 +151,7 @@ pub fn emitMir(emit: *Emit) Error!void {
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Type.fromInterned(uav.orig_ty).ptrAlignment(emit.pt.zcu),
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emit.lower.src_loc,
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)) {
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.mcv => |mcv| switch (mcv) {
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else => std.debug.panic("{s}: {}\n", .{ @src().fn_name, mcv }),
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.load_direct, .load_symbol => |sym_index| sym_index,
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},
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.mcv => |mcv| mcv.load_symbol,
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.fail => |em| {
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assert(emit.lower.err_msg == null);
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emit.lower.err_msg = em;
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@ -207,7 +201,9 @@ pub fn emitMir(emit: *Emit) Error!void {
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switch (lowered_inst.encoding.mnemonic) {
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.call => {
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reloc.target.type = .branch;
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try emit.encodeInst(lowered_inst, reloc_info);
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if (emit.bin_file.cast(.coff)) |_| try emit.encodeInst(try .new(.none, .call, &.{
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.{ .mem = .initRip(.ptr, 0) },
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}, emit.lower.target), reloc_info) else try emit.encodeInst(lowered_inst, reloc_info);
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continue :lowered_inst;
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},
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else => {},
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@ -284,6 +280,37 @@ pub fn emitMir(emit: *Emit) Error!void {
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}, emit.lower.target), reloc_info),
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else => unreachable,
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}
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} else if (emit.bin_file.cast(.coff)) |_| {
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if (reloc.target.is_extern) switch (lowered_inst.encoding.mnemonic) {
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.lea => try emit.encodeInst(try .new(.none, .mov, &.{
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lowered_inst.ops[0],
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.{ .mem = .initRip(.ptr, 0) },
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}, emit.lower.target), reloc_info),
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.mov => {
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const dst_reg = lowered_inst.ops[0].reg.to64();
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try emit.encodeInst(try .new(.none, .mov, &.{
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.{ .reg = dst_reg },
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.{ .mem = .initRip(.ptr, 0) },
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}, emit.lower.target), reloc_info);
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try emit.encodeInst(try .new(.none, .mov, &.{
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lowered_inst.ops[0],
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.{ .mem = .initSib(lowered_inst.ops[reloc.op_index].mem.sib.ptr_size, .{ .base = .{
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.reg = dst_reg,
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} }) },
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}, emit.lower.target), &.{});
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},
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else => unreachable,
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} else switch (lowered_inst.encoding.mnemonic) {
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.lea => try emit.encodeInst(try .new(.none, .lea, &.{
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lowered_inst.ops[0],
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.{ .mem = .initRip(.none, 0) },
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}, emit.lower.target), reloc_info),
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.mov => try emit.encodeInst(try .new(.none, .mov, &.{
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lowered_inst.ops[0],
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.{ .mem = .initRip(lowered_inst.ops[reloc.op_index].mem.sib.ptr_size, 0) },
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}, emit.lower.target), reloc_info),
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else => unreachable,
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}
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} else return emit.fail("TODO implement relocs for {s}", .{
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@tagName(emit.bin_file.tag),
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});
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@ -751,6 +778,21 @@ fn encodeInst(emit: *Emit, lowered_inst: Instruction, reloc_info: []const RelocI
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.symbolnum = @intCast(reloc.target.index),
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},
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});
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} else if (emit.bin_file.cast(.coff)) |coff_file| {
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const atom_index = coff_file.getAtomIndexForSymbol(
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.{ .sym_index = emit.atom_index, .file = null },
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).?;
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try coff_file.addRelocation(atom_index, .{
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.type = if (reloc.target.is_extern) .got else .direct,
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.target = if (reloc.target.is_extern)
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coff_file.getGlobalByIndex(reloc.target.index)
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else
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.{ .sym_index = reloc.target.index, .file = null },
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.offset = end_offset - 4,
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.addend = @intCast(reloc.off),
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.pcrel = true,
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.length = 2,
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});
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} else unreachable,
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.branch => if (emit.bin_file.cast(.elf)) |elf_file| {
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const zo = elf_file.zigObjectPtr().?;
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@ -781,13 +823,12 @@ fn encodeInst(emit: *Emit, lowered_inst: Instruction, reloc_info: []const RelocI
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const atom_index = coff_file.getAtomIndexForSymbol(
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.{ .sym_index = emit.atom_index, .file = null },
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).?;
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const target: link.File.Coff.SymbolWithLoc = if (link.File.Coff.global_symbol_bit & reloc.target.index != 0)
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coff_file.getGlobalByIndex(link.File.Coff.global_symbol_mask & reloc.target.index)
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else
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.{ .sym_index = reloc.target.index, .file = null };
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try coff_file.addRelocation(atom_index, .{
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.type = .direct,
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.target = target,
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.type = if (reloc.target.is_extern) .import else .got,
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.target = if (reloc.target.is_extern)
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coff_file.getGlobalByIndex(reloc.target.index)
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else
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.{ .sym_index = reloc.target.index, .file = null },
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.offset = end_offset - 4,
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.addend = @intCast(reloc.off),
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.pcrel = true,
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@ -1015,12 +1015,12 @@ pub fn genNavRef(
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.internal => {
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const atom_index = try coff_file.getOrCreateAtomForNav(nav_index);
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const sym_index = coff_file.getAtom(atom_index).getSymbolIndex().?;
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return .{ .mcv = .{ .load_got = sym_index } };
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return .{ .mcv = .{ .lea_symbol = sym_index } };
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},
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.strong, .weak => {
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const global_index = try coff_file.getGlobalSymbol(nav.name.toSlice(ip), lib_name.toSlice(ip));
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try coff_file.need_got_table.put(zcu.gpa, global_index, {}); // needs GOT
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return .{ .mcv = .{ .load_got = link.File.Coff.global_symbol_bit | global_index } };
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return .{ .mcv = .{ .lea_symbol = global_index } };
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},
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.link_once => unreachable,
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}
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@ -1767,7 +1767,7 @@ pub fn lowerUav(
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const atom = coff.getAtom(metadata.atom);
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const existing_addr = atom.getSymbol(coff).value;
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if (uav_alignment.check(existing_addr))
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return .{ .mcv = .{ .load_direct = atom.getSymbolIndex().? } };
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return .{ .mcv = .{ .load_symbol = atom.getSymbolIndex().? } };
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}
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var name_buf: [32]u8 = undefined;
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@ -1799,7 +1799,7 @@ pub fn lowerUav(
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.section = coff.rdata_section_index.?,
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});
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return .{ .mcv = .{
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.load_direct = coff.getAtom(atom_index).getSymbolIndex().?,
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.load_symbol = coff.getAtom(atom_index).getSymbolIndex().?,
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} };
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}
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