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zld: start work on reloc preprocessing

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This commit is contained in:
Jakub Konka 2021-04-01 18:18:04 +02:00
parent 04659f5b82
commit 1b5bceec91
1 changed files with 57 additions and 0 deletions
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57
src/link/MachO/Object.zig
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@ -97,6 +97,13 @@ pub fn parse(self: *Object) !void {
try self.readLoadCommands(reader);
if (self.symtab_cmd_index != null) try self.parseSymtab();
if (self.data_in_code_cmd_index != null) try self.readDataInCode();
{
const seg = self.load_commands.items[self.segment_cmd_index.?].Segment;
for (seg.sections.items) |_, sect_id| {
try self.parseRelocs(@intCast(u16, sect_id));
}
}
}
pub fn readLoadCommands(self: *Object, reader: anytype) !void {
@ -163,6 +170,56 @@ pub fn readLoadCommands(self: *Object, reader: anytype) !void {
}
}
pub fn parseRelocs(self: *Object, sect_id: u16) !void {
const seg = self.load_commands.items[self.segment_cmd_index.?].Segment;
const sect = seg.sections.items[sect_id];
if (sect.nreloc == 0) return;
var raw_relocs = try self.allocator.alloc(u8, @sizeOf(macho.relocation_info) * sect.nreloc);
defer self.allocator.free(raw_relocs);
_ = try self.file.?.preadAll(raw_relocs, sect.reloff);
const relocs = mem.bytesAsSlice(macho.relocation_info, raw_relocs);
for (relocs) |reloc| {
const is_addend = is_addend: {
switch (self.arch.?) {
.x86_64 => {
const rel_type = @intToEnum(macho.reloc_type_x86_64, reloc.r_type);
log.warn("{s}", .{rel_type});
break :is_addend false;
},
.aarch64 => {
const rel_type = @intToEnum(macho.reloc_type_arm64, reloc.r_type);
log.warn("{s}", .{rel_type});
break :is_addend rel_type == .ARM64_RELOC_ADDEND;
},
else => unreachable,
}
};
if (!is_addend) {
if (reloc.r_extern == 1) {
const sym = self.symtab.items[reloc.r_symbolnum];
const sym_name = self.getString(sym.inner.n_strx);
log.warn(" | symbol = {s}", .{sym_name});
} else {
const target_sect = seg.sections.items[reloc.r_symbolnum - 1];
log.warn(" | section = {s},{s}", .{
parseName(&target_sect.segname),
parseName(&target_sect.sectname),
});
}
}
log.warn(" | offset = 0x{x}", .{reloc.r_address});
log.warn(" | PC = {}", .{reloc.r_pcrel == 1});
log.warn(" | length = {}", .{reloc.r_length});
}
}
pub fn parseSymtab(self: *Object) !void {
const symtab_cmd = self.load_commands.items[self.symtab_cmd_index.?].Symtab;