# This file may be distributed under the terms of the GNU GPLv3 license.
# Usage:
-# objdump -m i386 -M i8086 -M suffix -d out/rom16.reloc.o | tools/checkstack.py
+# objdump -m i386 -M i8086 -M suffix -d out/rom16.o | tools/checkstack.py
import sys
import re
+# Functions that change stacks
+STACKHOP = ['__send_disk_op']
# List of functions we can assume are never called.
-#IGNORE = ['panic', '__dprintf', '__send_disk_op']
-IGNORE = ['panic', '__send_disk_op']
+#IGNORE = ['panic', '__dprintf']
+IGNORE = ['panic']
+
+OUTPUTDESC = """
+#funcname1[preamble_stack_usage,max_usage_with_callers]:
+# insn_addr:called_function [usage_at_call_point+caller_preamble,total_usage]
+#
+#funcname2[p,m,max_usage_to_yield_point]:
+# insn_addr:called_function [u+c,t,usage_to_yield_point]
+"""
# Find out maximum stack usage for a function
def calcmaxstack(funcs, funcaddr):
info = funcs[funcaddr]
# Find max of all nested calls.
- max = info[1]
- info[2] = max
- for insnaddr, calladdr, usage in info[3]:
- callinfo = funcs[calladdr]
+ maxusage = info[1]
+ maxyieldusage = doesyield = 0
+ if info[3] is not None:
+ maxyieldusage = info[3]
+ doesyield = 1
+ info[2] = maxusage
+ info[4] = info[3]
+ seenbefore = {}
+ totcalls = 0
+ for insnaddr, calladdr, usage in info[6]:
+ callinfo = funcs.get(calladdr)
+ if callinfo is None:
+ continue
if callinfo[2] is None:
calcmaxstack(funcs, calladdr)
- if callinfo[0].split('.')[0] in IGNORE:
+ if callinfo[0] not in seenbefore:
+ seenbefore[callinfo[0]] = 1
+ totcalls += 1 + callinfo[5]
+ funcnameroot = callinfo[0].split('.')[0]
+ if funcnameroot in IGNORE:
# This called function is ignored - don't contribute it to
# the max stack.
continue
+ if funcnameroot in STACKHOP:
+ if usage > maxusage:
+ maxusage = usage
+ if callinfo[4] is not None:
+ doesyield = 1
+ if usage > maxyieldusage:
+ maxyieldusage = usage
+ continue
totusage = usage + callinfo[2]
- if totusage > max:
- max = totusage
- info[2] = max
+ if totusage > maxusage:
+ maxusage = totusage
+ if callinfo[4] is not None:
+ doesyield = 1
+ totyieldusage = usage + callinfo[4]
+ if totyieldusage > maxyieldusage:
+ maxyieldusage = totyieldusage
+ info[2] = maxusage
+ if doesyield:
+ info[4] = maxyieldusage
+ info[5] = totcalls
+
+# Try to arrange output so that functions that call each other are
+# near each other.
+def orderfuncs(funcaddrs, availfuncs):
+ l = [(availfuncs[funcaddr][5], availfuncs[funcaddr][0], funcaddr)
+ for funcaddr in funcaddrs if funcaddr in availfuncs]
+ l.sort()
+ l.reverse()
+ out = []
+ while l:
+ count, name, funcaddr = l.pop(0)
+ if funcaddr not in availfuncs:
+ continue
+ calladdrs = [calls[1] for calls in availfuncs[funcaddr][6]]
+ del availfuncs[funcaddr]
+ out = out + orderfuncs(calladdrs, availfuncs) + [funcaddr]
+ return out
+
+# Update function info with a found "yield" point.
+def noteYield(info, stackusage):
+ prevyield = info[3]
+ if prevyield is None or prevyield < stackusage:
+ info[3] = stackusage
+
+# Update function info with a found "call" point.
+def noteCall(info, subfuncs, insnaddr, calladdr, stackusage):
+ if (calladdr, stackusage) in subfuncs:
+ # Already noted a nearly identical call - ignore this one.
+ return
+ info[6].append((insnaddr, calladdr, stackusage))
+ subfuncs[(calladdr, stackusage)] = 1
hex_s = r'[0-9a-f]+'
re_func = re.compile(r'^(?P<funcaddr>' + hex_s + r') <(?P<func>.*)>:$')
def calc():
# funcs[funcaddr] = [funcname, basicstackusage, maxstackusage
- # , [(addr, callfname, stackusage), ...]]
- funcs = {-1: ['<indirect>', 0, 0, []]}
+ # , yieldusage, maxyieldusage, totalcalls
+ # , [(insnaddr, calladdr, stackusage), ...]]
+ funcs = {-1: ['<indirect>', 0, 0, None, None, 0, []]}
cur = None
atstart = 0
stackusage = 0
if m is not None:
# Found function
funcaddr = int(m.group('funcaddr'), 16)
- funcs[funcaddr] = cur = [m.group('func'), 0, None, []]
+ funcs[funcaddr] = cur = [m.group('func'), 0, None, None, None, 0, []]
stackusage = 0
atstart = 1
subfuncs = {}
im = re_usestack.match(insn)
if im is not None:
- if insn[:5] == 'pushl' or insn[:6] == 'pushfl':
+ if insn.startswith('pushl') or insn.startswith('pushfl'):
stackusage += 4
continue
- elif insn[:5] == 'pushw' or insn[:6] == 'pushfw':
+ elif insn.startswith('pushw') or insn.startswith('pushfw'):
stackusage += 2
continue
stackusage += int(im.group('num'), 16)
if atstart:
+ if insn == 'movl %esp,%ebp':
+ # Still part of initial header
+ continue
cur[1] = stackusage
atstart = 0
+ insnaddr = m.group('insnaddr')
calladdr = m.group('calladdr')
if calladdr is None:
- if insn[:6] == 'lcallw':
- stackusage += 4
- calladdr = -1
+ if insn.startswith('lcallw'):
+ noteCall(cur, subfuncs, insnaddr, -1, stackusage + 4)
+ noteYield(cur, stackusage + 4)
+ elif insn.startswith('int'):
+ noteCall(cur, subfuncs, insnaddr, -1, stackusage + 6)
+ noteYield(cur, stackusage + 6)
+ elif insn.startswith('sti'):
+ noteYield(cur, stackusage)
else:
- # misc instruction - just ignore
+ # misc instruction
continue
else:
# Jump or call insn
calladdr = int(calladdr, 16)
ref = m.group('ref')
if '+' in ref:
- # Inter-function jump - reset stack usage to
- # preamble usage
- stackusage = cur[1]
- continue
- if insn[:1] == 'j':
+ # Inter-function jump.
+ pass
+ elif insn.startswith('j'):
# Tail call
- stackusage = 0
- elif insn[:5] == 'calll':
- stackusage += 4
+ noteCall(cur, subfuncs, insnaddr, calladdr, 0)
+ elif insn.startswith('calll'):
+ noteCall(cur, subfuncs, insnaddr, calladdr, stackusage + 4)
else:
print "unknown call", ref
- if (calladdr, stackusage) not in subfuncs:
- cur[3].append((m.group('insnaddr'), calladdr, stackusage))
- subfuncs[(calladdr, stackusage)] = 1
+ noteCall(cur, subfuncs, insnaddr, calladdr, stackusage)
# Reset stack usage to preamble usage
stackusage = cur[1]
- continue
-
#print "other", repr(line)
# Calculate maxstackusage
- bynames = {}
for funcaddr, info in funcs.items():
- bynames[info[0]] = info
if info[2] is not None:
continue
calcmaxstack(funcs, funcaddr)
+ # Sort functions for output
+ funcaddrs = orderfuncs(funcs.keys(), funcs.copy())
+
# Show all functions
- funcnames = bynames.keys()
- funcnames.sort()
- for funcname in funcnames:
- name, basicusage, maxusage, calls = bynames[funcname]
- if maxusage == 0:
+ print OUTPUTDESC
+ for funcaddr in funcaddrs:
+ name, basicusage, maxusage, yieldusage, maxyieldusage, count, calls = \
+ funcs[funcaddr]
+ if maxusage == 0 and maxyieldusage is None:
continue
- print "\n%s[%d,%d]:" % (funcname, basicusage, maxusage)
+ yieldstr = ""
+ if maxyieldusage is not None:
+ yieldstr = ",%d" % maxyieldusage
+ print "\n%s[%d,%d%s]:" % (name, basicusage, maxusage, yieldstr)
for insnaddr, calladdr, stackusage in calls:
- callinfo = funcs[calladdr]
- print " %04s:%-40s [%d+%d,%d]" % (
+ callinfo = funcs.get(calladdr, ("<unknown>", 0, 0, 0, None))
+ yieldstr = ""
+ if callinfo[4] is not None:
+ yieldstr = ",%d" % (stackusage + callinfo[4])
+ print " %04s:%-40s [%d+%d,%d%s]" % (
insnaddr, callinfo[0], stackusage, callinfo[1]
- , stackusage+callinfo[2])
+ , stackusage+callinfo[2], yieldstr)
def main():
calc()
projects / seabios.git / blobdiff