From: Waldemar Kozaczuk <jwkozac...@gmail.com>
Committer: Waldemar Kozaczuk <jwkozac...@gmail.com>
Branch: master
aarch64 trace: make compiler pick a register instead of x0
This subtle 1-character patch fixes a nasty bug that causes interrupts
to be enabled instead of correctly restored to the state it was when
saving the state. This bug would affect the tracing logic and result in
crashes described by the issues #1158 and #1195.
This bug in inline assembly was most likely a typo as I am sure
the intention was to use '%0' instead of 'x0' to let compiler
correctly pick a register instead of using any garbage in the x0
register.
Fixes #1158
Fixes #1195
Signed-off-by: Waldemar Kozaczuk <jwkozac...@gmail.com>
---
diff --git a/arch/aarch64/arch.hh b/arch/aarch64/arch.hh
--- a/arch/aarch64/arch.hh
+++ b/arch/aarch64/arch.hh
@@ -79,7 +79,7 @@ inline void irq_flag_notrace::save() {
}
inline void irq_flag_notrace::restore() {
- asm volatile("msr daif, x0" :: "r"(daif) : "memory");
+ asm volatile("msr daif, %0" :: "r"(daif) : "memory");
}
inline bool irq_flag_notrace::enabled() const {
--
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