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x86_64: add support for pie executables

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This commit is contained in:
Jacob Young
2025-06-04 21:45:31 -04:00
committed by Andrew Kelley
parent 178ee8aef1
commit 0bf8617d96
45 changed files with 884 additions and 640 deletions
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81
src/codegen.zig
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@@ -921,41 +921,74 @@ fn genNavRef(
const nav = ip.getNav(nav_index);
assert(!nav.isThreadlocal(ip));
const is_extern, const lib_name = if (nav.getExtern(ip)) |e|
.{ true, e.lib_name }
const lib_name, const linkage, const visibility = if (nav.getExtern(ip)) |e|
.{ e.lib_name, e.linkage, e.visibility }
else
.{ false, .none };
.{ .none, .internal, .default };
const name = nav.name;
if (lf.cast(.elf)) |elf_file| {
const zo = elf_file.zigObjectPtr().?;
if (is_extern) {
const sym_index = try elf_file.getGlobalSymbol(name.toSlice(ip), lib_name.toSlice(ip));
zo.symbol(sym_index).flags.is_extern_ptr = true;
return .{ .mcv = .{ .lea_symbol = sym_index } };
switch (linkage) {
.internal => {
const sym_index = try zo.getOrCreateMetadataForNav(zcu, nav_index);
return .{ .mcv = .{ .lea_symbol = sym_index } };
},
.strong, .weak => {
const sym_index = try elf_file.getGlobalSymbol(name.toSlice(ip), lib_name.toSlice(ip));
switch (linkage) {
.internal => unreachable,
.strong => {},
.weak => zo.symbol(sym_index).flags.weak = true,
.link_once => unreachable,
}
switch (visibility) {
.default => zo.symbol(sym_index).flags.is_extern_ptr = true,
.hidden, .protected => {},
}
return .{ .mcv = .{ .lea_symbol = sym_index } };
},
.link_once => unreachable,
}
const sym_index = try zo.getOrCreateMetadataForNav(zcu, nav_index);
return .{ .mcv = .{ .lea_symbol = sym_index } };
} else if (lf.cast(.macho)) |macho_file| {
const zo = macho_file.getZigObject().?;
if (is_extern) {
const sym_index = try macho_file.getGlobalSymbol(name.toSlice(ip), lib_name.toSlice(ip));
zo.symbols.items[sym_index].flags.is_extern_ptr = true;
return .{ .mcv = .{ .lea_symbol = sym_index } };
switch (linkage) {
.internal => {
const sym_index = try zo.getOrCreateMetadataForNav(macho_file, nav_index);
const sym = zo.symbols.items[sym_index];
return .{ .mcv = .{ .lea_symbol = sym.nlist_idx } };
},
.strong, .weak => {
const sym_index = try macho_file.getGlobalSymbol(name.toSlice(ip), lib_name.toSlice(ip));
switch (linkage) {
.internal => unreachable,
.strong => {},
.weak => zo.symbols.items[sym_index].flags.weak = true,
.link_once => unreachable,
}
switch (visibility) {
.default => zo.symbols.items[sym_index].flags.is_extern_ptr = true,
.hidden, .protected => {},
}
return .{ .mcv = .{ .lea_symbol = sym_index } };
},
.link_once => unreachable,
}
const sym_index = try zo.getOrCreateMetadataForNav(macho_file, nav_index);
const sym = zo.symbols.items[sym_index];
return .{ .mcv = .{ .lea_symbol = sym.nlist_idx } };
} else if (lf.cast(.coff)) |coff_file| {
if (is_extern) {
// TODO audit this
const global_index = try coff_file.getGlobalSymbol(name.toSlice(ip), lib_name.toSlice(ip));
try coff_file.need_got_table.put(gpa, global_index, {}); // needs GOT
return .{ .mcv = .{ .load_got = link.File.Coff.global_symbol_bit | global_index } };
// TODO audit this
switch (linkage) {
.internal => {
const atom_index = try coff_file.getOrCreateAtomForNav(nav_index);
const sym_index = coff_file.getAtom(atom_index).getSymbolIndex().?;
return .{ .mcv = .{ .load_got = sym_index } };
},
.strong, .weak => {
const global_index = try coff_file.getGlobalSymbol(name.toSlice(ip), lib_name.toSlice(ip));
try coff_file.need_got_table.put(gpa, global_index, {}); // needs GOT
return .{ .mcv = .{ .load_got = link.File.Coff.global_symbol_bit | global_index } };
},
.link_once => unreachable,
}
const atom_index = try coff_file.getOrCreateAtomForNav(nav_index);
const sym_index = coff_file.getAtom(atom_index).getSymbolIndex().?;
return .{ .mcv = .{ .load_got = sym_index } };
} else if (lf.cast(.plan9)) |p9| {
const atom_index = try p9.seeNav(pt, nav_index);
const atom = p9.getAtom(atom_index);