Author: Armin Rigo <[email protected]>
Branch:
Changeset: r1139:8ae8781fb784
Date: 2014-04-06 20:41 +0200
http://bitbucket.org/pypy/stmgc/changeset/8ae8781fb784/
Log: A gdb script that adds two built-in functions (see doc). The very
minimal to debug without getting crazy imo.
diff --git a/c7/gdb/gdb_stm.py b/c7/gdb/gdb_stm.py
new file mode 100644
--- /dev/null
+++ b/c7/gdb/gdb_stm.py
@@ -0,0 +1,49 @@
+""" Adds two built-in functions: $rfs(p=0) and $rgs(p=0).
+
+Returns the number or the address 'p', offset with the value of
+the %fs or %gs register in the current thread.
+
+Usage: you can for example add this line in your ~/.gdbinit:
+
+ python execfile('/path/to/gdb_stm.py')
+"""
+import gdb
+
+def gdb_function(func):
+ class Func(gdb.Function):
+ __doc__ = func.__doc__
+ invoke = staticmethod(func)
+ Func(func.__name__)
+
+# -------------------------------------------------------
+
+SEG_FS = 0x1003
+SEG_GS = 0x1004
+
+def get_segment_register(which):
+ v = gdb.parse_and_eval('(long*)malloc(8)')
+ L = gdb.lookup_type('long')
+ gdb.parse_and_eval('arch_prctl(%d, %d)' % (which, int(v.cast(L))))
+ result = int(v.dereference())
+ gdb.parse_and_eval('free(%d)' % (int(v.cast(L)),))
+ return result
+
+def rfsrgs(name, which):
+ seg = get_segment_register(which)
+ if name is None:
+ return seg
+ tp = name.type
+ if tp.code == gdb.TYPE_CODE_INT:
+ return name + seg
+ assert tp.code == gdb.TYPE_CODE_PTR
+ L = gdb.lookup_type('long')
+ return (name.cast(L) + seg).cast(tp)
+
+@gdb_function
+def rfs(name=None):
+ return rfsrgs(name, SEG_FS)
+
+@gdb_function
+def rgs(name=None):
+ return rfsrgs(name, SEG_GS)
+
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