diff options
| -rw-r--r-- | zig-elf/main.zig | 20 |
1 files changed, 7 insertions, 13 deletions
diff --git a/zig-elf/main.zig b/zig-elf/main.zig index 23c8d5a..0f480ff 100644 --- a/zig-elf/main.zig +++ b/zig-elf/main.zig @@ -1,12 +1,6 @@ // $ readelf -h ./elf // https://github.com/bminor/binutils-gdb/blob/master/binutils/readelf.c -// There is still a problem with packed structs and aligment padding -// better referenced in these two threads (sometime struct is not aligned -// properly or even has 1 byte more than its C alternative): -// - https://ziggit.dev/t/mapping-64-u8-buffer-to-a-struct/6052/19 -// - https://ziggit.dev/t/wrong-sizes-of-extern-packed-structs/6053/6 - const std = @import("std"); const Elf64ExecutionHeader = packed struct { @@ -30,10 +24,10 @@ pub fn main() !void { var file = try std.fs.cwd().openFile("./elf", .{}); defer file.close(); - var buffer: [64]u8 = undefined; - _ = try file.read(buffer[0..]); + var buffer: [64]u8 align(@alignOf(Elf64ExecutionHeader)) = undefined; + _ = try file.read(buffer[0..@sizeOf(Elf64ExecutionHeader)]); - const header: *Elf64ExecutionHeader = @ptrCast(@alignCast(&buffer)); + const header: *Elf64ExecutionHeader = @ptrCast(&buffer); std.debug.print("sizeOf(Elf64ExecutionHeader) = {}\n", .{@sizeOf(Elf64ExecutionHeader)}); std.debug.print("bitSizeOf(Elf64ExecutionHeader) = {} ({}/8={d})\n", .{ @@ -51,8 +45,8 @@ pub fn main() !void { std.debug.print("Processor-specific flags: 0x{X:0>2}\n", .{header.flags}); std.debug.print("ELF header size in bytes: {}\n", .{header.ehsize}); std.debug.print("Program header table entry size: {}\n", .{header.phentsize}); - // std.debug.print("Program header table entry count: {}\n", .{header.phnum}); - // std.debug.print("Section header table entry size: {}\n", .{header.shentsize}); - // std.debug.print("Section header table entry count: {}\n", .{header.shnum}); - // std.debug.print("Section header string table index: {}\n", .{header.shstrndx}); + std.debug.print("Program header table entry count: {}\n", .{header.phnum}); + std.debug.print("Section header table entry size: {}\n", .{header.shentsize}); + std.debug.print("Section header table entry count: {}\n", .{header.shnum}); + std.debug.print("Section header string table index: {}\n", .{header.shstrndx}); } |