We used to use performance cycle counter for cycles(),
but it is kind of useless in userspace as each core
has its own counter and hence not comparable between
cores. Also, the cycle counter stops counting when
the cores are idle.
Most callers expect cycles() to return a high resolution
timestamp instead, so do the best we can do here
and enable the userspace generic timer virtual counter.
at the _cas0 label, the linker would generate spurious stack
adjustment before the return:
atexitdont+0x84 0x000000000003614c CLREX $0xf
atexitdont+0x88 0x0000000000036150 MOVW R31,R0
atexitdont+0x8c 0x0000000000036154 MOV (SP)16!,R30 <- ????????????
atexitdont+0x90 0x0000000000036158 RETURN
the work arround is to move the code into its own cas0
text symbol.
this fixes impossible cwfs crashes in srvi().
cinap_lenrek