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macho: refactor relocation type in incremental linker

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This commit is contained in:
Jakub Konka 2023-04-05 08:23:46 +02:00
parent 1795b8eb4e
commit eba280ce20
5 changed files with 118 additions and 190 deletions
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29
src/arch/aarch64/Emit.zig
View File

@ -673,7 +673,7 @@ fn mirCallExtern(emit: *Emit, inst: Mir.Inst.Index) !void {
const atom_index = macho_file.getAtomIndexForSymbol(.{ .sym_index = relocation.atom_index, .file = null }).?;
const target = macho_file.getGlobalByIndex(relocation.sym_index);
try link.File.MachO.Atom.addRelocation(macho_file, atom_index, .{
.type = @enumToInt(std.macho.reloc_type_arm64.ARM64_RELOC_BRANCH26),
.type = .branch,
.target = target,
.offset = offset,
.addend = 0,
@ -883,41 +883,32 @@ fn mirLoadMemoryPie(emit: *Emit, inst: Mir.Inst.Index) !void {
}
if (emit.bin_file.cast(link.File.MachO)) |macho_file| {
const Atom = link.File.MachO.Atom;
const Relocation = Atom.Relocation;
const atom_index = macho_file.getAtomIndexForSymbol(.{ .sym_index = data.atom_index, .file = null }).?;
// TODO this causes segfault in stage1
// try atom.addRelocations(macho_file, 2, .{
try link.File.MachO.Atom.addRelocation(macho_file, atom_index, .{
try Atom.addRelocations(macho_file, atom_index, &[_]Relocation{ .{
.target = .{ .sym_index = data.sym_index, .file = null },
.offset = offset,
.addend = 0,
.pcrel = true,
.length = 2,
.type = switch (tag) {
.load_memory_got,
.load_memory_ptr_got,
=> @enumToInt(std.macho.reloc_type_arm64.ARM64_RELOC_GOT_LOAD_PAGE21),
.load_memory_direct,
.load_memory_ptr_direct,
=> @enumToInt(std.macho.reloc_type_arm64.ARM64_RELOC_PAGE21),
.load_memory_got, .load_memory_ptr_got => Relocation.Type.got_page,
.load_memory_direct, .load_memory_ptr_direct => Relocation.Type.page,
else => unreachable,
},
});
try link.File.MachO.Atom.addRelocation(macho_file, atom_index, .{
}, .{
.target = .{ .sym_index = data.sym_index, .file = null },
.offset = offset + 4,
.addend = 0,
.pcrel = false,
.length = 2,
.type = switch (tag) {
.load_memory_got,
.load_memory_ptr_got,
=> @enumToInt(std.macho.reloc_type_arm64.ARM64_RELOC_GOT_LOAD_PAGEOFF12),
.load_memory_direct,
.load_memory_ptr_direct,
=> @enumToInt(std.macho.reloc_type_arm64.ARM64_RELOC_PAGEOFF12),
.load_memory_got, .load_memory_ptr_got => Relocation.Type.got_pageoff,
.load_memory_direct, .load_memory_ptr_direct => Relocation.Type.pageoff,
else => unreachable,
},
});
} });
} else if (emit.bin_file.cast(link.File.Coff)) |coff_file| {
const atom_index = coff_file.getAtomIndexForSymbol(.{ .sym_index = data.atom_index, .file = null }).?;
const target = switch (tag) {

13
src/arch/x86_64/Emit.zig
View File

@ -42,7 +42,7 @@ pub fn emitMir(emit: *Emit) Error!void {
).?;
const target = macho_file.getGlobalByIndex(inst.data.relocation.sym_index);
try link.File.MachO.Atom.addRelocation(macho_file, atom_index, .{
.type = @enumToInt(std.macho.reloc_type_x86_64.X86_64_RELOC_BRANCH),
.type = .branch,
.target = target,
.offset = end_offset - 4,
.addend = 0,
@ -68,17 +68,16 @@ pub fn emitMir(emit: *Emit) Error!void {
.mov_linker, .lea_linker => if (emit.bin_file.cast(link.File.MachO)) |macho_file| {
const metadata =
emit.lower.mir.extraData(Mir.LeaRegisterReloc, inst.data.payload).data;
const reloc_type = switch (inst.ops) {
.got_reloc => @enumToInt(std.macho.reloc_type_x86_64.X86_64_RELOC_GOT),
.direct_reloc => @enumToInt(std.macho.reloc_type_x86_64.X86_64_RELOC_SIGNED),
else => unreachable,
};
const atom_index = macho_file.getAtomIndexForSymbol(.{
.sym_index = metadata.atom_index,
.file = null,
}).?;
try link.File.MachO.Atom.addRelocation(macho_file, atom_index, .{
.type = reloc_type,
.type = switch (inst.ops) {
.got_reloc => .got,
.direct_reloc => .signed,
else => unreachable,
},
.target = .{ .sym_index = metadata.sym_index, .file = null },
.offset = @intCast(u32, end_offset - 4),
.addend = 0,

68
src/link/MachO.zig
View File

@ -1250,11 +1250,7 @@ pub fn createGotAtom(self: *MachO, target: SymbolWithLoc) !Atom.Index {
log.debug("allocated GOT atom at 0x{x}", .{sym.n_value});
try Atom.addRelocation(self, atom_index, .{
.type = switch (self.base.options.target.cpu.arch) {
.aarch64 => @enumToInt(macho.reloc_type_arm64.ARM64_RELOC_UNSIGNED),
.x86_64 => @enumToInt(macho.reloc_type_x86_64.X86_64_RELOC_UNSIGNED),
else => unreachable,
},
.type = .unsigned,
.target = target,
.offset = 0,
.addend = 0,
@ -1336,15 +1332,15 @@ fn createStubHelperPreambleAtom(self: *MachO) !void {
code[9] = 0xff;
code[10] = 0x25;
try Atom.addRelocations(self, atom_index, 2, .{ .{
.type = @enumToInt(macho.reloc_type_x86_64.X86_64_RELOC_SIGNED),
try Atom.addRelocations(self, atom_index, &[_]Relocation{ .{
.type = .signed,
.target = dyld_private,
.offset = 3,
.addend = 0,
.pcrel = true,
.length = 2,
}, .{
.type = @enumToInt(macho.reloc_type_x86_64.X86_64_RELOC_GOT),
.type = .got,
.target = dyld_stub_binder,
.offset = 11,
.addend = 0,
@ -1376,29 +1372,29 @@ fn createStubHelperPreambleAtom(self: *MachO) !void {
// br x16
mem.writeIntLittle(u32, code[20..][0..4], aarch64.Instruction.br(.x16).toU32());
try Atom.addRelocations(self, atom_index, 4, .{ .{
.type = @enumToInt(macho.reloc_type_arm64.ARM64_RELOC_PAGE21),
try Atom.addRelocations(self, atom_index, &[_]Relocation{ .{
.type = .page,
.target = dyld_private,
.offset = 0,
.addend = 0,
.pcrel = true,
.length = 2,
}, .{
.type = @enumToInt(macho.reloc_type_arm64.ARM64_RELOC_PAGEOFF12),
.type = .pageoff,
.target = dyld_private,
.offset = 4,
.addend = 0,
.pcrel = false,
.length = 2,
}, .{
.type = @enumToInt(macho.reloc_type_arm64.ARM64_RELOC_GOT_LOAD_PAGE21),
.type = .got_page,
.target = dyld_stub_binder,
.offset = 12,
.addend = 0,
.pcrel = true,
.length = 2,
}, .{
.type = @enumToInt(macho.reloc_type_arm64.ARM64_RELOC_GOT_LOAD_PAGEOFF12),
.type = .got_pageoff,
.target = dyld_stub_binder,
.offset = 16,
.addend = 0,
@ -1456,7 +1452,7 @@ fn createStubHelperAtom(self: *MachO) !Atom.Index {
code[5] = 0xe9;
try Atom.addRelocation(self, atom_index, .{
.type = @enumToInt(macho.reloc_type_x86_64.X86_64_RELOC_BRANCH),
.type = .branch,
.target = .{ .sym_index = stub_helper_preamble_atom_sym_index, .file = null },
.offset = 6,
.addend = 0,
@ -1479,7 +1475,7 @@ fn createStubHelperAtom(self: *MachO) !Atom.Index {
// Next 4 bytes 8..12 are just a placeholder populated in `populateLazyBindOffsetsInStubHelper`.
try Atom.addRelocation(self, atom_index, .{
.type = @enumToInt(macho.reloc_type_arm64.ARM64_RELOC_BRANCH26),
.type = .branch,
.target = .{ .sym_index = stub_helper_preamble_atom_sym_index, .file = null },
.offset = 4,
.addend = 0,
@ -1507,11 +1503,7 @@ fn createLazyPointerAtom(self: *MachO, stub_sym_index: u32, target: SymbolWithLo
sym.n_sect = self.la_symbol_ptr_section_index.? + 1;
try Atom.addRelocation(self, atom_index, .{
.type = switch (self.base.options.target.cpu.arch) {
.aarch64 => @enumToInt(macho.reloc_type_arm64.ARM64_RELOC_UNSIGNED),
.x86_64 => @enumToInt(macho.reloc_type_x86_64.X86_64_RELOC_UNSIGNED),
else => unreachable,
},
.type = .unsigned,
.target = .{ .sym_index = stub_sym_index, .file = null },
.offset = 0,
.addend = 0,
@ -1565,7 +1557,7 @@ fn createStubAtom(self: *MachO, laptr_sym_index: u32) !Atom.Index {
code[1] = 0x25;
try Atom.addRelocation(self, atom_index, .{
.type = @enumToInt(macho.reloc_type_x86_64.X86_64_RELOC_BRANCH),
.type = .branch,
.target = .{ .sym_index = laptr_sym_index, .file = null },
.offset = 2,
.addend = 0,
@ -1585,9 +1577,9 @@ fn createStubAtom(self: *MachO, laptr_sym_index: u32) !Atom.Index {
// br x16
mem.writeIntLittle(u32, code[8..12], aarch64.Instruction.br(.x16).toU32());
try Atom.addRelocations(self, atom_index, 2, .{
try Atom.addRelocations(self, atom_index, &[_]Relocation{
.{
.type = @enumToInt(macho.reloc_type_arm64.ARM64_RELOC_PAGE21),
.type = .page,
.target = .{ .sym_index = laptr_sym_index, .file = null },
.offset = 0,
.addend = 0,
@ -1595,7 +1587,7 @@ fn createStubAtom(self: *MachO, laptr_sym_index: u32) !Atom.Index {
.length = 2,
},
.{
.type = @enumToInt(macho.reloc_type_arm64.ARM64_RELOC_PAGEOFF12),
.type = .pageoff,
.target = .{ .sym_index = laptr_sym_index, .file = null },
.offset = 4,
.addend = 0,
@ -2663,11 +2655,7 @@ pub fn getDeclVAddr(self: *MachO, decl_index: Module.Decl.Index, reloc_info: Fil
const sym_index = self.getAtom(this_atom_index).getSymbolIndex().?;
const atom_index = self.getAtomIndexForSymbol(.{ .sym_index = reloc_info.parent_atom_index, .file = null }).?;
try Atom.addRelocation(self, atom_index, .{
.type = switch (self.base.options.target.cpu.arch) {
.aarch64 => @enumToInt(macho.reloc_type_arm64.ARM64_RELOC_UNSIGNED),
.x86_64 => @enumToInt(macho.reloc_type_x86_64.X86_64_RELOC_UNSIGNED),
else => unreachable,
},
.type = .unsigned,
.target = .{ .sym_index = sym_index, .file = null },
.offset = @intCast(u32, reloc_info.offset),
.addend = reloc_info.addend,
@ -3115,28 +3103,6 @@ fn allocateAtom(self: *MachO, atom_index: Atom.Index, new_atom_size: u64, alignm
return vaddr;
}
fn getSectionPrecedence(header: macho.section_64) u4 {
if (header.isCode()) {
if (mem.eql(u8, "__text", header.sectName())) return 0x0;
if (header.type() == macho.S_SYMBOL_STUBS) return 0x1;
return 0x2;
}
switch (header.type()) {
macho.S_NON_LAZY_SYMBOL_POINTERS,
macho.S_LAZY_SYMBOL_POINTERS,
=> return 0x0,
macho.S_MOD_INIT_FUNC_POINTERS => return 0x1,
macho.S_MOD_TERM_FUNC_POINTERS => return 0x2,
macho.S_ZEROFILL => return 0xf,
macho.S_THREAD_LOCAL_REGULAR => return 0xd,
macho.S_THREAD_LOCAL_ZEROFILL => return 0xe,
else => if (mem.eql(u8, "__eh_frame", header.sectName()))
return 0xf
else
return 0x3,
}
}
pub fn getGlobalSymbol(self: *MachO, name: []const u8, lib_name: ?[]const u8) !u32 {
_ = lib_name;
const gpa = self.base.allocator;

16
src/link/MachO/Atom.zig
View File

@ -14,7 +14,7 @@ const trace = @import("../../tracy.zig").trace;
const Allocator = mem.Allocator;
const Arch = std.Target.Cpu.Arch;
const MachO = @import("../MachO.zig");
const Relocation = @import("Relocation.zig");
pub const Relocation = @import("Relocation.zig");
const SymbolWithLoc = MachO.SymbolWithLoc;
/// Each decl always gets a local symbol with the fully qualified name.
@ -113,25 +113,19 @@ pub fn freeListEligible(self: Atom, macho_file: *MachO) bool {
}
pub fn addRelocation(macho_file: *MachO, atom_index: Index, reloc: Relocation) !void {
return addRelocations(macho_file, atom_index, 1, .{reloc});
return addRelocations(macho_file, atom_index, &[_]Relocation{reloc});
}
pub fn addRelocations(
macho_file: *MachO,
atom_index: Index,
comptime count: comptime_int,
relocs: [count]Relocation,
) !void {
pub fn addRelocations(macho_file: *MachO, atom_index: Index, relocs: []Relocation) !void {
const gpa = macho_file.base.allocator;
const target = macho_file.base.options.target;
const gop = try macho_file.relocs.getOrPut(gpa, atom_index);
if (!gop.found_existing) {
gop.value_ptr.* = .{};
}
try gop.value_ptr.ensureUnusedCapacity(gpa, count);
try gop.value_ptr.ensureUnusedCapacity(gpa, relocs.len);
for (relocs) |reloc| {
log.debug(" (adding reloc of type {s} to target %{d})", .{
reloc.fmtType(target),
@tagName(reloc.type),
reloc.target.sym_index,
});
gop.value_ptr.appendAssumeCapacity(reloc);

182
src/link/MachO/Relocation.zig
View File

@ -1,19 +1,7 @@
const Relocation = @This();
//! Relocation used by the self-hosted backends to instruct the linker where and how to
//! fixup the values when flushing the contents to file and/or memory.
const std = @import("std");
const aarch64 = @import("../../arch/aarch64/bits.zig");
const assert = std.debug.assert;
const log = std.log.scoped(.link);
const macho = std.macho;
const math = std.math;
const mem = std.mem;
const meta = std.meta;
const Atom = @import("Atom.zig");
const MachO = @import("../MachO.zig");
const SymbolWithLoc = MachO.SymbolWithLoc;
type: u4,
type: Type,
target: SymbolWithLoc,
offset: u32,
addend: i64,
@ -21,36 +9,46 @@ pcrel: bool,
length: u2,
dirty: bool = true,
pub const Type = enum {
// x86, x86_64
/// RIP-relative displacement to a GOT pointer
got,
/// RIP-relative displacement
signed,
/// RIP-relative displacemen to threadlocal variable descriptor
tlv,
// aarch64
/// PC-relative distance to target page in GOT section
got_page,
/// Offset to a GOT pointer relative to the start of a page in GOT section
got_pageoff,
/// PC-relative distance to target page in a section
page,
/// Offset to a pointer relative to the start of a page in a section
pageoff,
/// PC-relative distance to target page in TLV section
tlv_page,
/// Offset to a pointer relative to the start of a page in TLV section
tlv_pageoff,
// common
/// PC/RIP-relative displacement B/BL/CALL
branch,
/// Absolute pointer value
unsigned,
};
/// Returns true if and only if the reloc is dirty AND the target address is available.
pub fn isResolvable(self: Relocation, macho_file: *MachO) bool {
_ = self.getTargetAtomIndex(macho_file) orelse return false;
return self.dirty;
}
pub fn fmtType(self: Relocation, target: std.Target) []const u8 {
switch (target.cpu.arch) {
.aarch64 => return @tagName(@intToEnum(macho.reloc_type_arm64, self.type)),
.x86_64 => return @tagName(@intToEnum(macho.reloc_type_x86_64, self.type)),
else => unreachable,
}
}
pub fn getTargetAtomIndex(self: Relocation, macho_file: *MachO) ?Atom.Index {
switch (macho_file.base.options.target.cpu.arch) {
.aarch64 => switch (@intToEnum(macho.reloc_type_arm64, self.type)) {
.ARM64_RELOC_GOT_LOAD_PAGE21,
.ARM64_RELOC_GOT_LOAD_PAGEOFF12,
.ARM64_RELOC_POINTER_TO_GOT,
=> return macho_file.getGotAtomIndexForSymbol(self.target),
else => {},
},
.x86_64 => switch (@intToEnum(macho.reloc_type_x86_64, self.type)) {
.X86_64_RELOC_GOT,
.X86_64_RELOC_GOT_LOAD,
=> return macho_file.getGotAtomIndexForSymbol(self.target),
else => {},
},
else => unreachable,
switch (self.type) {
.got, .got_page, .got_pageoff => return macho_file.getGotAtomIndexForSymbol(self.target),
else => {},
}
if (macho_file.getStubsAtomIndexForSymbol(self.target)) |stubs_atom| return stubs_atom;
return macho_file.getAtomIndexForSymbol(self.target);
@ -70,7 +68,7 @@ pub fn resolve(self: Relocation, macho_file: *MachO, atom_index: Atom.Index, cod
source_addr,
target_addr,
macho_file.getSymbolName(self.target),
self.fmtType(macho_file.base.options.target),
@tagName(self.type),
});
switch (arch) {
@ -81,18 +79,9 @@ pub fn resolve(self: Relocation, macho_file: *MachO, atom_index: Atom.Index, cod
}
fn resolveAarch64(self: Relocation, source_addr: u64, target_addr: i64, code: []u8) void {
const rel_type = @intToEnum(macho.reloc_type_arm64, self.type);
if (rel_type == .ARM64_RELOC_UNSIGNED) {
return switch (self.length) {
2 => mem.writeIntLittle(u32, code[self.offset..][0..4], @truncate(u32, @bitCast(u64, target_addr))),
3 => mem.writeIntLittle(u64, code[self.offset..][0..8], @bitCast(u64, target_addr)),
else => unreachable,
};
}
var buffer = code[self.offset..][0..4];
switch (rel_type) {
.ARM64_RELOC_BRANCH26 => {
var buffer = code[self.offset..];
switch (self.type) {
.branch => {
const displacement = math.cast(
i28,
@intCast(i64, target_addr) - @intCast(i64, source_addr),
@ -101,15 +90,12 @@ fn resolveAarch64(self: Relocation, source_addr: u64, target_addr: i64, code: []
.unconditional_branch_immediate = mem.bytesToValue(meta.TagPayload(
aarch64.Instruction,
aarch64.Instruction.unconditional_branch_immediate,
), buffer),
), buffer[0..4]),
};
inst.unconditional_branch_immediate.imm26 = @truncate(u26, @bitCast(u28, displacement >> 2));
mem.writeIntLittle(u32, buffer, inst.toU32());
mem.writeIntLittle(u32, buffer[0..4], inst.toU32());
},
.ARM64_RELOC_PAGE21,
.ARM64_RELOC_GOT_LOAD_PAGE21,
.ARM64_RELOC_TLVP_LOAD_PAGE21,
=> {
.page, .got_page, .tlv_page => {
const source_page = @intCast(i32, source_addr >> 12);
const target_page = @intCast(i32, target_addr >> 12);
const pages = @bitCast(u21, @intCast(i21, target_page - source_page));
@ -117,31 +103,29 @@ fn resolveAarch64(self: Relocation, source_addr: u64, target_addr: i64, code: []
.pc_relative_address = mem.bytesToValue(meta.TagPayload(
aarch64.Instruction,
aarch64.Instruction.pc_relative_address,
), buffer),
), buffer[0..4]),
};
inst.pc_relative_address.immhi = @truncate(u19, pages >> 2);
inst.pc_relative_address.immlo = @truncate(u2, pages);
mem.writeIntLittle(u32, buffer, inst.toU32());
mem.writeIntLittle(u32, buffer[0..4], inst.toU32());
},
.ARM64_RELOC_PAGEOFF12,
.ARM64_RELOC_GOT_LOAD_PAGEOFF12,
=> {
.pageoff, .got_pageoff => {
const narrowed = @truncate(u12, @intCast(u64, target_addr));
if (isArithmeticOp(buffer)) {
if (isArithmeticOp(buffer[0..4])) {
var inst = aarch64.Instruction{
.add_subtract_immediate = mem.bytesToValue(meta.TagPayload(
aarch64.Instruction,
aarch64.Instruction.add_subtract_immediate,
), buffer),
), buffer[0..4]),
};
inst.add_subtract_immediate.imm12 = narrowed;
mem.writeIntLittle(u32, buffer, inst.toU32());
mem.writeIntLittle(u32, buffer[0..4], inst.toU32());
} else {
var inst = aarch64.Instruction{
.load_store_register = mem.bytesToValue(meta.TagPayload(
aarch64.Instruction,
aarch64.Instruction.load_store_register,
), buffer),
), buffer[0..4]),
};
const offset: u12 = blk: {
if (inst.load_store_register.size == 0) {
@ -157,21 +141,21 @@ fn resolveAarch64(self: Relocation, source_addr: u64, target_addr: i64, code: []
}
};
inst.load_store_register.offset = offset;
mem.writeIntLittle(u32, buffer, inst.toU32());
mem.writeIntLittle(u32, buffer[0..4], inst.toU32());
}
},
.ARM64_RELOC_TLVP_LOAD_PAGEOFF12 => {
.tlv_pageoff => {
const RegInfo = struct {
rd: u5,
rn: u5,
size: u2,
};
const reg_info: RegInfo = blk: {
if (isArithmeticOp(buffer)) {
if (isArithmeticOp(buffer[0..4])) {
const inst = mem.bytesToValue(meta.TagPayload(
aarch64.Instruction,
aarch64.Instruction.add_subtract_immediate,
), buffer);
), buffer[0..4]);
break :blk .{
.rd = inst.rd,
.rn = inst.rn,
@ -181,7 +165,7 @@ fn resolveAarch64(self: Relocation, source_addr: u64, target_addr: i64, code: []
const inst = mem.bytesToValue(meta.TagPayload(
aarch64.Instruction,
aarch64.Instruction.load_store_register,
), buffer);
), buffer[0..4]);
break :blk .{
.rd = inst.rt,
.rn = inst.rn,
@ -201,45 +185,24 @@ fn resolveAarch64(self: Relocation, source_addr: u64, target_addr: i64, code: []
.sf = @truncate(u1, reg_info.size),
},
};
mem.writeIntLittle(u32, buffer, inst.toU32());
mem.writeIntLittle(u32, buffer[0..4], inst.toU32());
},
.ARM64_RELOC_POINTER_TO_GOT => {
const result = @intCast(i32, @intCast(i64, target_addr) - @intCast(i64, source_addr));
mem.writeIntLittle(i32, buffer, result);
.unsigned => switch (self.length) {
2 => mem.writeIntLittle(u32, buffer[0..4], @truncate(u32, @bitCast(u64, target_addr))),
3 => mem.writeIntLittle(u64, buffer[0..8], @bitCast(u64, target_addr)),
else => unreachable,
},
.ARM64_RELOC_SUBTRACTOR => unreachable,
.ARM64_RELOC_ADDEND => unreachable,
.ARM64_RELOC_UNSIGNED => unreachable,
.got, .signed, .tlv => unreachable, // Invalid target architecture.
}
}
fn resolveX8664(self: Relocation, source_addr: u64, target_addr: i64, code: []u8) void {
const rel_type = @intToEnum(macho.reloc_type_x86_64, self.type);
switch (rel_type) {
.X86_64_RELOC_BRANCH,
.X86_64_RELOC_GOT,
.X86_64_RELOC_GOT_LOAD,
.X86_64_RELOC_TLV,
=> {
switch (self.type) {
.branch, .got, .tlv, .signed => {
const displacement = @intCast(i32, @intCast(i64, target_addr) - @intCast(i64, source_addr) - 4);
mem.writeIntLittle(u32, code[self.offset..][0..4], @bitCast(u32, displacement));
},
.X86_64_RELOC_SIGNED,
.X86_64_RELOC_SIGNED_1,
.X86_64_RELOC_SIGNED_2,
.X86_64_RELOC_SIGNED_4,
=> {
const correction: u3 = switch (rel_type) {
.X86_64_RELOC_SIGNED => 0,
.X86_64_RELOC_SIGNED_1 => 1,
.X86_64_RELOC_SIGNED_2 => 2,
.X86_64_RELOC_SIGNED_4 => 4,
else => unreachable,
};
const displacement = @intCast(i32, target_addr - @intCast(i64, source_addr + correction + 4));
mem.writeIntLittle(u32, code[self.offset..][0..4], @bitCast(u32, displacement));
},
.X86_64_RELOC_UNSIGNED => {
.unsigned => {
switch (self.length) {
2 => {
mem.writeIntLittle(u32, code[self.offset..][0..4], @truncate(u32, @bitCast(u64, target_addr)));
@ -250,7 +213,7 @@ fn resolveX8664(self: Relocation, source_addr: u64, target_addr: i64, code: []u8
else => unreachable,
}
},
.X86_64_RELOC_SUBTRACTOR => unreachable,
.got_page, .got_pageoff, .page, .pageoff, .tlv_page, .tlv_pageoff => unreachable, // Invalid target architecture.
}
}
@ -258,3 +221,18 @@ inline fn isArithmeticOp(inst: *const [4]u8) bool {
const group_decode = @truncate(u5, inst[3]);
return ((group_decode >> 2) == 4);
}
const Relocation = @This();
const std = @import("std");
const aarch64 = @import("../../arch/aarch64/bits.zig");
const assert = std.debug.assert;
const log = std.log.scoped(.link);
const macho = std.macho;
const math = std.math;
const mem = std.mem;
const meta = std.meta;
const Atom = @import("Atom.zig");
const MachO = @import("../MachO.zig");
const SymbolWithLoc = MachO.SymbolWithLoc;