syscall.sh / csky / perf_event_open

perf_event_open

set up performance monitoring

sys_perf_event_open(struct perf_event_attr *attr_uptr, pid_t pid, int cpu, int group_fd, unsigned long flags)

register	value
`r7`	241, the syscall number
`a0`	struct perf_event_attr *attr_uptr
`a1`	pid_t pid
`a2`	int cpu
`a3`	int group_fd
`r4`	unsigned long flags
`a0`	the return value

Then run trap 0 to enter the kernel.

Same syscall on other architectures