| ... | ... | @@ -4305,24 +4305,21 @@ pub fn linkWithZld(macho_file: *MachO, comp: *Compilation, prog_node: *std.Progr |
| 4305 | 4305 | // segment and the beginning of __LINKEDIT segment is zerofilled as the loader will |
| 4306 | 4306 | // copy-paste this space into memory for quicker zerofill operation. |
| 4307 | 4307 | if (zld.getSegmentByName("__DATA")) |data_seg_id| blk: { |
| 4308 | | var physical_zerofill_start: u64 = 0; |
| 4308 | var physical_zerofill_start: ?u64 = null; |
| 4309 | 4309 | const section_indexes = zld.getSectionIndexes(data_seg_id); |
| 4310 | 4310 | for (zld.sections.items(.header)[section_indexes.start..section_indexes.end]) |header| { |
| 4311 | 4311 | if (header.isZerofill() and header.size > 0) break; |
| 4312 | 4312 | physical_zerofill_start = header.offset + header.size; |
| 4313 | 4313 | } else break :blk; |
| 4314 | const start = physical_zerofill_start orelse break :blk; |
| 4314 | 4315 | const linkedit = zld.getLinkeditSegmentPtr(); |
| 4315 | | const physical_zerofill_size = math.cast(usize, linkedit.fileoff - physical_zerofill_start) orelse |
| 4316 | | return error.Overflow; |
| 4317 | | if (physical_zerofill_size > 0) { |
| 4318 | | log.debug("zeroing out zerofill area of length {x} at {x}", .{ |
| 4319 | | physical_zerofill_size, |
| 4320 | | physical_zerofill_start, |
| 4321 | | }); |
| 4322 | | var padding = try zld.gpa.alloc(u8, physical_zerofill_size); |
| 4316 | const size = math.cast(usize, linkedit.fileoff - start) orelse return error.Overflow; |
| 4317 | if (size > 0) { |
| 4318 | log.debug("zeroing out zerofill area of length {x} at {x}", .{ size, start }); |
| 4319 | var padding = try zld.gpa.alloc(u8, size); |
| 4323 | 4320 | defer zld.gpa.free(padding); |
| 4324 | 4321 | mem.set(u8, padding, 0); |
| 4325 | | try zld.file.pwriteAll(padding, physical_zerofill_start); |
| 4322 | try zld.file.pwriteAll(padding, start); |
| 4326 | 4323 | } |
| 4327 | 4324 | } |
| 4328 | 4325 | |
Jakub Konka <kubkon@jakubkonka.com> 2022-11-06 00:36:27+01:00
src