syscall.sh / sh / 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
`r3`	336, the syscall number
`r4`	struct perf_event_attr *attr_uptr
`r5`	pid_t pid
`r6`	int cpu
`r7`	int group_fd
`r0`	unsigned long flags
`r0`	the return value

Then run trapa #31 to enter the kernel.

Same syscall on other architectures