Created
October 4, 2020 12:15
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Relocating BPF map fds
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| for (self.progs.items) |*prog| { | |
| const rel_name = try std.mem.join(self.allocator, "", &[_][]const u8{ ".rel", prog.name }); | |
| defer self.allocator.free(rel_name); | |
| const rel_section: *Elf.Section = for (self.elf.relos.items) |relo| { | |
| if (mem.eql(u8, self.elf.get_section_name(relo), rel_name)) { | |
| break relo; | |
| } | |
| } else continue; | |
| for (std.mem.bytesAsSlice(Elf64_Rel, rel_section.data)) |relo| { | |
| const insn_idx = relo.r_offset / @sizeOf(BPF.Insn); | |
| const symbol = self.elf.get_sym_idx(@truncate(u32, relo.r_info >> 32)); | |
| const map_name = self.elf.get_str(symbol.st_name); | |
| const map_fd = for (self.maps.items) |m| { | |
| if (mem.eql(u8, m.name, map_name)) { | |
| break m.fd.?; | |
| } | |
| } else continue; | |
| prog.insns[insn_idx].src = BPF.PSEUDO_MAP_FD; | |
| prog.insns[insn_idx].imm = map_fd; | |
| } | |
| } |
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