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limit warning logs in disassembler

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Pascal Zittlau
2025-12-16 23:01:52 +01:00
parent 7161b6d1a2
commit 5d146140b9
1 changed files with 28 additions and 20 deletions
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48
src/disassembler.zig
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@@ -6,10 +6,14 @@ const log = std.log.scoped(.disassembler);
const assert = std.debug.assert; const assert = std.debug.assert;
pub const InstructionIterator = struct { pub const InstructionIterator = struct {
/// Maximum number of warnings to print per iterator before suppressing.
pub var max_warnings: u64 = 3;
decoder: zydis.ZydisDecoder, decoder: zydis.ZydisDecoder,
bytes: []const u8, bytes: []const u8,
instruction: zydis.ZydisDecodedInstruction, instruction: zydis.ZydisDecodedInstruction,
operands: [zydis.ZYDIS_MAX_OPERAND_COUNT]zydis.ZydisDecodedOperand, operands: [zydis.ZYDIS_MAX_OPERAND_COUNT]zydis.ZydisDecodedOperand,
warnings: usize = 0,
pub fn init(bytes: []const u8) InstructionIterator { pub fn init(bytes: []const u8) InstructionIterator {
var decoder: zydis.ZydisDecoder = undefined; var decoder: zydis.ZydisDecoder = undefined;
@@ -38,29 +42,33 @@ pub const InstructionIterator = struct {
var address: u64 = @intFromPtr(iterator.bytes.ptr); var address: u64 = @intFromPtr(iterator.bytes.ptr);
while (!zydis.ZYAN_SUCCESS(status)) { while (!zydis.ZYAN_SUCCESS(status)) {
// TODO: handle common padding bytes if (status == zydis.ZYDIS_STATUS_NO_MORE_DATA) {
switch (status) { log.debug("next: Got status: NO_MORE_DATA. Iterator completed.", .{});
zydis.ZYDIS_STATUS_NO_MORE_DATA => { return null;
log.info("next: Got status: NO_MORE_DATA. Iterator completed.", .{});
return null;
},
zydis.ZYDIS_STATUS_ILLEGAL_LOCK => log.warn("next: Got status: ILLEGAL_LOCK. " ++
"Byte stepping, to find next valid instruction begin", .{}),
zydis.ZYDIS_STATUS_DECODING_ERROR => log.warn("next: Got status: DECODING_ERROR. " ++
"Byte stepping, to find next valid instruction begin", .{}),
zydis.ZYDIS_STATUS_INVALID_MAP => log.warn("next: Got status: INVALID_MAP. " ++
"Byte stepping, to find next valid instruction begin", .{}),
else => log.warn("next: Got unknown status: 0x{x}. Byte stepping, to find next " ++
"valid instruction begin", .{status}),
} }
// TODO: handle common padding bytes
// TODO: add a flag to instead return an error // TODO: add a flag to instead return an error
iterator.warnings += 1;
if (iterator.warnings <= max_warnings) {
const err_desc = switch (status) {
zydis.ZYDIS_STATUS_ILLEGAL_LOCK => "ILLEGAL_LOCK",
zydis.ZYDIS_STATUS_DECODING_ERROR => "DECODING_ERROR",
zydis.ZYDIS_STATUS_INVALID_MAP => "INVALID_MAP",
else => "UNKNOWN",
};
log.warn(
"next: Got status: {s} (0x{x}). Byte stepping, for next instruction begin",
.{ err_desc, status },
);
if (iterator.warnings == max_warnings) {
log.warn("next: Suppressing further warnings for this disassembly.", .{});
}
}
log.debug( log.debug(
"next: instruction length: {}, address: 0x{x}, bytes: 0x{x}", "next: skipping byte at address: 0x{x}, byte: 0x{x}",
.{ .{ address, iterator.bytes[0] },
iterator.instruction.length,
address,
iterator.bytes[0..iterator.instruction.length],
},
); );
iterator.bytes = iterator.bytes[1..]; iterator.bytes = iterator.bytes[1..];