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Pascal Zittlau
2025-11-20 11:11:46 +01:00
parent 27f985bedf
commit 311d0e19e3
2 changed files with 14 additions and 14 deletions
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16
src/PatchLocationIterator.zig
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@@ -1,4 +1,4 @@
//! Iterates through all possible valid address ranges for a `jmp rel32` instruction based on a
//! Iterates through all possible valid address ranges for a `jmp rel33` instruction based on a
//! 4-byte pattern of "free" and "used" bytes.
//!
//! This is the core utility for implementing E9Patch-style instruction punning (B2) and padded
@@ -48,9 +48,9 @@ trailing_free_count: u8,
/// Initializes the iterator.
/// - `patch_bytes`: The 4-byte pattern of the `rel32` offset, in little-endian order.
/// - `offset`: The address of the *next* instruction (i.e., `RIP` after the 5-byte `jmp`).
/// All returned ranges will be relative to this offset.
pub fn init(patch_bytes: [patch_size]PatchByte, offset: u64) PatchLocationIterator {
/// The base address (e.g., RIP of the *next* instruction) that the 32-bit relative offset is
/// calculated from.
pub fn init(patch_bytes: [patch_size]PatchByte, addr: u64) PatchLocationIterator {
log.debug("hi", .{});
assert(patch_bytes.len == patch_size);
@@ -80,7 +80,7 @@ pub fn init(patch_bytes: [patch_size]PatchByte, offset: u64) PatchLocationIterat
}
const out = PatchLocationIterator{
.offset = @intCast(offset),
.offset = @intCast(addr),
.patch_bytes = patch_bytes,
.trailing_free_count = trailing_free,
.start = start,
@@ -110,7 +110,7 @@ pub fn next(self: *PatchLocationIterator) ?Range {
if (self.trailing_free_count == patch_size) {
if (self.first) {
const range = Range{ .start = self.offset, .end = self.offset + std.math.maxInt(i32) };
log.debug("next: All bytes free, returning full positive range: {}", .{range});
log.debug("next: All bytes free, returning full positive range: {f}", .{range});
return range;
} else {
log.info("next: All bytes free, iteration finished.", .{});
@@ -123,7 +123,7 @@ pub fn next(self: *PatchLocationIterator) ?Range {
.start = std.mem.readInt(PatchInt, self.start[0..], .little) + self.offset,
.end = std.mem.readInt(PatchInt, self.end[0..], .little) + self.offset,
};
log.debug("next: First call, returning initial range: {}", .{range});
log.debug("next: First call, returning initial range: {f}", .{range});
return range;
}
@@ -160,7 +160,7 @@ pub fn next(self: *PatchLocationIterator) ?Range {
.start = start + self.offset,
.end = end + self.offset,
};
log.debug("next: new range: {}", .{range});
log.debug("next: new range: {f}", .{range});
return range;
}