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libafl_qemu: unset thumb bit for breakpoints (#2619)

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* unset thumb bit for breakpoints
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Romain Malmain 2024-10-17 09:42:56 +02:00 committed by GitHub
parent 23e966c702
commit 3b31b4d796
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1 changed files with 14 additions and 0 deletions
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14
libafl_qemu/src/qemu/mod.rs
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@ -825,12 +825,26 @@ impl Qemu {
}
pub fn set_breakpoint(&self, addr: GuestAddr) {
// Remove thumb bit encoded in addresses.
// Since ARMv7, instructions are (half-)word aligned, so this is safe.
// For ARMv6 and before, this could be wrong since SCTLR.U could be 0.
// TODO: check precisely for architecture before doing this.
#[cfg(target_arch = "arm")]
let addr = { addr & !1 };
unsafe {
libafl_qemu_set_breakpoint(addr.into());
}
}
pub fn remove_breakpoint(&self, addr: GuestAddr) {
// Remove thumb bit encoded in addresses.
// Since ARMv7, instructions are (half-)word aligned, so this is safe.
// For ARMv6 and before, this could be wrong since SCTLR.U could be 0.
// TODO: check precisely for architecture before doing this.
#[cfg(target_arch = "arm")]
let addr = { addr & !1 };
unsafe {
libafl_qemu_remove_breakpoint(addr.into());
}