HP gnu source-level debugger 5992-4701 manual Function

step	Continue running your program until control reaches a different
	source line, then stop it and return control to GDB. This
	command is abbreviated s.
	WARNING! If you use the step command while control is
	within a function that was compiled without debugging
	information, execution proceeds until control reaches a function
	that does have debugging information. Likewise, it will not step
	into a function which is compiled without debugging
	information. To step through functions without debugging
	information, use the stepi command, described below.
	The step command only stops at the first instruction of a source
	line. This prevents the multiple stops that could otherwise occur
	in switch statements, for loops, and so on. step continues to
	stop if a function that has debugging information is called within
	the line. In other words, step steps inside any functions called
	within the line.
	Also, the step command only enters a function if there is line
	number information for the function. Otherwise it acts like the
	next command. This avoids problems when using cc -gl
	on MIPS machines. Previously, step entered subroutines if there
	was any debugging information about the routine.
step count	Continue running as in step, but do so count times. If a
	breakpoint is reached, or a signal not related to stepping occurs
	before count steps, stepping stops right away.
next [count]	Continue to the next source line in the current (innermost) stack
	frame. This is similar to step, but function calls that appear
	within the line of code are executed without stopping. Execution
	stops when control reaches a different line of code at the original
	stack level that was executing when you gave the next
	command. This command is abbreviated n.
	An argument count is a repeat count, as for step.
	The next command only stops at the first instruction of a source
	line. This prevents multiple stops that could otherwise occur in
	switch statements, for loops, and so on.
finish	Continue running until just after function in the selected stack
	frame returns. Print the returned value (if any).
	Contrast this with the return command (see “Returning from
	a function” (page 121)).

5.2 Continuing and stepping 65