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stage2 MachO: remove discontinuities between segments

master
Jakub Konka 2020-11-16 16:13:44 +01:00
parent 6ac7e99dad
commit 7a407246ed
1 changed files with 12 additions and 6 deletions
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18
src/link/MachO.zig
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@ -1,5 +1,4 @@
const MachO = @This();
const std = @import("std");
const Allocator = std.mem.Allocator;
const assert = std.debug.assert;
@ -375,6 +374,12 @@ pub fn flushModule(self: *MachO, comp: *Compilation) !void {
try self.writeSymbolTable();
try self.writeStringTable();
{
// Seal __DATA,__got section size
const got = &self.sections.items[self.got_section_index.?];
got.size = @intCast(u32, self.offset_table.items.len * @sizeOf(u64));
}
{
// TODO rework how we preallocate space for the entire __LINKEDIT segment instead of
// doing dynamic updates like this.
@ -947,7 +952,8 @@ pub fn updateDecl(self: *MachO, module: *Module, decl: *Module.Decl) !void {
},
};
const required_alignment = typed_value.ty.abiAlignment(self.base.options.target);
// const required_alignment = typed_value.ty.abiAlignment(self.base.options.target);
const required_alignment = 4;
assert(decl.link.macho.local_sym_index != 0); // Caller forgot to call allocateDeclIndexes()
const symbol = &self.local_symbols.items[decl.link.macho.local_sym_index];
@ -997,7 +1003,6 @@ pub fn updateDecl(self: *MachO, module: *Module, decl: *Module.Decl) !void {
const text_section = self.sections.items[self.text_section_index.?];
const section_offset = symbol.n_value - text_section.addr;
const file_offset = text_section.offset + section_offset;
try self.base.file.?.pwriteAll(code, file_offset);
// Since we updated the vaddr and the size, each corresponding export symbol also needs to be updated.
@ -1168,7 +1173,7 @@ pub fn populateMissingMetadata(self: *MachO) !void {
.addr = text_segment.vmaddr + off,
.size = file_size,
.offset = off,
.@"align" = 12, // 2^12 = 4096
.@"align" = 2, // 2^12 = 4096
.reloff = 0,
.nreloc = 0,
.flags = flags,
@ -1193,7 +1198,7 @@ pub fn populateMissingMetadata(self: *MachO) !void {
.segname = makeStaticString("__DATA"),
.vmaddr = text_segment.vmaddr + text_segment.vmsize,
.vmsize = 0,
.fileoff = 0,
.fileoff = text_segment.fileoff + text_segment.filesize,
.filesize = 0,
.maxprot = maxprot,
.initprot = initprot,
@ -1210,7 +1215,8 @@ pub fn populateMissingMetadata(self: *MachO) !void {
data_segment.nsects += 1;
const file_size = @sizeOf(u64) * self.base.options.symbol_count_hint;
const off = @intCast(u32, self.findFreeSpace(file_size, 0x1000));
// const off = @intCast(u32, self.findFreeSpace(file_size, 0x1000));
const off = @intCast(u32, data_segment.fileoff);
log.debug("found __got section free space 0x{x} to 0x{x}\n", .{ off, off + file_size });