Get all references to the function, and print the first push opcode of the reference (argument)

find_opcodes.idc

#include <idc.idc>
static main (void) {
	auto ea = ScreenEA();
	auto xt;
    auto r = RfirstB(ea);
	
	  Message("Function\tCall\tOpcodeAddr\tOpcode\tOpcodeHex\n");
	
    while (r != -1) {
		xt = XrefType();
		if (xt == fl_CF || xt == fl_CN || xt == fl_F || xt == fl_JF || xt == fl_JN) {
			auto funcName =  GetFunctionName(r);
			if (funcName == "") {
				funcName = "undefined";
			}
			Message("%s\t%08lx\t", funcName, r);
			find_out_opcode(r);
		}
		r = RnextB(ea, r);
	}
}

static find_out_opcode(ea) {
	auto min_ea = ea - 0x20;

	auto found_ea = FindText(ea, SEARCH_NEXT, 0, 0, "push ");
	auto opcode = GetOperandValue(found_ea, 0);
	Message("%08lx\t%d\t0x%04X", found_ea, opcode, opcode);
	if (found_ea < min_ea) {
		Message("\tpossibly wrong");
	}
	Message("\n");
}