/*
* This file contains sequences of code that will be copied to a
- * fixed location, defined in <asm/atomic_seq.h>. The interrupt
+ * fixed location, defined in <asm/fixed_code.h>. The interrupt
* handlers ensure that these sequences appear to be atomic when
* executed from userspace.
* These are aligned to 16 bytes, so that we have some space to replace
.align 16
/*
- * Atomic ior, 32 bit.
+ * Atomic and, 32 bit.
* Inputs: P0: memory address to use
- * R0: value to ior
+ * R0: value to and
* Outputs: R0: new contents of the memory address.
* R1: previous contents of the memory address.
*/
R0 = R1 & R0;
[P0] = R0;
rts;
-ENDPROC (_atomic_ior32)
+ENDPROC (_atomic_and32)
.align 16
/*
- * Atomic ior, 32 bit.
+ * Atomic xor, 32 bit.
* Inputs: P0: memory address to use
- * R0: value to ior
+ * R0: value to xor
* Outputs: R0: new contents of the memory address.
* R1: previous contents of the memory address.
*/
R0 = R1 ^ R0;
[P0] = R0;
rts;
-ENDPROC (_atomic_ior32)
+ENDPROC (_atomic_xor32)
+
+.align 16
+ /*
+ * safe_user_instruction
+ * Four NOPS are enough to allow the pipeline to speculativily load
+ * execute anything it wants. After that, things have gone bad, and
+ * we are stuck - so panic. Since we might be in user space, we can't
+ * call panic, so just cause a unhandled exception, this should cause
+ * a dump of the trace buffer so we can tell were we are, and a reboot
+ */
+ENTRY(_safe_user_instruction)
+ NOP; NOP; NOP; NOP;
+ EXCPT 0x4;
+ENDPROC(_safe_user_instruction)
ENTRY(_fixed_code_end)