jtgi

brendan greg's incredibleness: http://www.brendangregg.com/Perf/linux_observability_tools.png
vim practice: wget https://raw.githubusercontent.com/jtgi/algs-ds/1e4f2b066f0b0f102a35e8573d9a12b1f0c19e0b/Trees/Bst.java

jtgi

#include <xeroskernel.h>

/*
 * Runs in user space, executing handler then
 * returning to previous stack of the process
 */
void sigtramp(void (*handler)(void *), void *ctx_frame, unsigned int old_esp) {
  handler(ctx_frame);
  syssigreturn(old_esp);
}

jtgi

.pos 0x100

main:	irmovl bottom,  %esp     # initialize stack
	irmovl a,       %edi     # address of the first element of a
	irmovl alen,    %esi	  
	mrmovl (%esi),  %esi     # number of elements of a
	irmovl $0x1,    %eax
	subl   %eax,    %esi     # last index in a
					   # ready to call findmax: a --> edi, last --> esi
	call findmax