1 Changes from the Plan 9 acid (beyond the 
2 obvious changes necessary to compile without
3 Ken's compiler and with the new libmach interface).
4 ========================================
5 
6 the input-line print verb is %Z, so that %L can be for locations
7 
8 the register block is explicitly "mapped" at 0 by xget1, xget2, ...
9 	for compatibility with old acid, even though libmach
10 	doesn't participate in this lie anymore.
11 
12 main accepts pid, file, and core in any order
13 
14 the ptab only records pids (no ctl fd anymore).
15 
16 new builtin sysstop(pid) runs pid until the next syscall
17 
18 map() returns 5-tuples: (name, filename, base, end, offset)
19 	filename is new
20 
21 map() expects a 5-tuple too
22 
23 strace expects a list of register names and values like
24 	{"PC", *PC, "SP", *SP}
25 
26 strace returns 5-tuples now:
27 	{fn, pc, callerpc, paramlist, locallist}
28 
29 new builtin includepipe(cmd) includes the standard output
30 	of running cmd.
31 
32 symbols returns 4-tuples now: {name, type, addr, file}
33 
34 new builtin textfile() returns the current set of open text files
35 	as a list of {file, base} pairs.
36 
37 new builtin textfile({file, base}) adds a new file's symbols and text
38 	offset by base for relocatables.
39 
40 new builtin deltextfile(file) removes a file from the set of open text files.
41 
42 both textfile and deltextfile update symbols.
43 
44 ====
45 
46 yet to be done:
47 
48 elflink has the linking info for elf on linux
49