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elf: write out contents of .rela sections

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This commit is contained in:
Jakub Konka 2023-11-01 23:34:24 +01:00
parent 3606b5df3f
commit 5698be3ef0
2 changed files with 58 additions and 0 deletions
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4
src/link/Elf.zig
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@ -4400,6 +4400,10 @@ fn updateSymtabSize(self: *Elf) !void {
fn writeSyntheticSections(self: *Elf) !void {
const gpa = self.base.allocator;
if (self.zigObjectPtr()) |zig_object| {
try zig_object.writeRelaSections(self);
}
if (self.interp_section_index) |shndx| {
const shdr = self.shdrs.items[shndx];
const sh_size = math.cast(usize, shdr.sh_size) orelse return error.Overflow;

54
src/link/Elf/ZigObject.zig
View File

@ -432,6 +432,60 @@ pub fn updateRelaSectionSizes(self: ZigObject, elf_file: *Elf) void {
}
}
pub fn writeRelaSections(self: ZigObject, elf_file: *Elf) !void {
_ = self;
const gpa = elf_file.base.allocator;
for (&[_]?u16{
elf_file.zig_text_rela_section_index,
elf_file.zig_data_rel_ro_rela_section_index,
elf_file.zig_data_rela_section_index,
}) |maybe_index| {
const index = maybe_index orelse continue;
const shdr = elf_file.shdrs.items[index];
const meta = elf_file.last_atom_and_free_list_table.get(@intCast(shdr.sh_info)).?;
const last_atom_index = meta.last_atom_index;
var atom = elf_file.atom(last_atom_index) orelse continue;
var relocs = std.ArrayList(elf.Elf64_Rela).init(gpa);
defer relocs.deinit();
try relocs.ensureTotalCapacityPrecise(@divExact(shdr.sh_size, shdr.sh_entsize));
while (true) {
for (atom.relocs(elf_file)) |rel| {
relocs.appendAssumeCapacity(switch (rel.r_type()) {
Elf.R_X86_64_ZIG_GOT32 => .{
.r_offset = rel.r_offset,
.r_addend = rel.r_addend,
.r_info = (@as(u64, @intCast(rel.r_sym())) << 32) | elf.R_X86_64_32,
},
Elf.R_X86_64_ZIG_GOTPCREL => .{
.r_offset = rel.r_offset,
.r_addend = rel.r_addend,
.r_info = (@as(u64, @intCast(rel.r_sym())) << 32) | elf.R_X86_64_PC32,
},
else => rel,
});
}
if (elf_file.atom(atom.prev_index)) |prev| {
atom = prev;
} else break;
}
const SortRelocs = struct {
pub fn lessThan(ctx: void, lhs: elf.Elf64_Rela, rhs: elf.Elf64_Rela) bool {
_ = ctx;
return lhs.r_offset < rhs.r_offset;
}
};
mem.sort(elf.Elf64_Rela, relocs.items, {}, SortRelocs.lessThan);
try elf_file.base.file.?.pwriteAll(mem.sliceAsBytes(relocs.items), shdr.sh_offset);
}
}
pub fn symbol(self: *ZigObject, index: Symbol.Index) Symbol.Index {
const is_global = index & global_symbol_bit != 0;
const actual_index = index & symbol_mask;