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* m32c-tdep.c (m32c_m16c_address_to_pointer): Print warning 

instead of an error if no PLT entry is found.  Return a
	potentially useful result.
	(m32c_m16c_pointer_to_address): Add code to search for function
	address when no .plt entry is found.
This commit is contained in:
Kevin Buettner 2010-04-16 22:46:27 +00:00
parent 9e3223abf4
commit d77b48cf13
2 changed files with 54 additions and 7 deletions
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8
gdb/ChangeLog
View File

@ -1,3 +1,11 @@
2010-04-16 Kevin Buettner <kevinb@redhat.com>
* m32c-tdep.c (m32c_m16c_address_to_pointer): Print warning
instead of an error if no PLT entry is found. Return a
potentially useful result.
(m32c_m16c_pointer_to_address): Add code to search for function
address when no .plt entry is found.
2010-04-16 Stan Shebs <stan@codesourcery.com>
* tracepoint.c (trace_variable_command): Run a cleanup.

53
gdb/m32c-tdep.c
View File

@ -2431,8 +2431,8 @@ m32c_m16c_address_to_pointer (struct gdbarch *gdbarch,
struct minimal_symbol *func_msym = lookup_minimal_symbol_by_pc (addr);
if (! func_msym)
error ("Cannot convert code address %s to function pointer:\n"
"couldn't find a symbol at that address, to find trampoline.",
error (_("Cannot convert code address %s to function pointer:\n"
"couldn't find a symbol at that address, to find trampoline."),
paddress (gdbarch, addr));
func_name = SYMBOL_LINKAGE_NAME (func_msym);
@ -2448,12 +2448,39 @@ m32c_m16c_address_to_pointer (struct gdbarch *gdbarch,
xfree (tramp_name);
if (! tramp_msym)
error ("Cannot convert code address %s to function pointer:\n"
"couldn't find trampoline named '%s.plt'.",
paddress (gdbarch, addr), func_name);
{
CORE_ADDR ptrval;
/* The trampoline's address is our pointer. */
addr = SYMBOL_VALUE_ADDRESS (tramp_msym);
/* No PLT entry found. Mask off the upper bits of the address
to make a pointer. As noted in the warning to the user
below, this value might be useful if converted back into
an address by GDB, but will otherwise, almost certainly,
be garbage.
Using this masked result does seem to be useful
in gdb.cp/cplusfuncs.exp in which ~40 FAILs turn into
PASSes. These results appear to be correct as well.
We print a warning here so that the user can make a
determination about whether the result is useful or not. */
ptrval = addr & 0xffff;
warning (_("Cannot convert code address %s to function pointer:\n"
"couldn't find trampoline named '%s.plt'.\n"
"Returning pointer value %s instead; this may produce\n"
"a useful result if converted back into an address by GDB,\n"
"but will most likely not be useful otherwise.\n"),
paddress (gdbarch, addr), func_name,
paddress (gdbarch, ptrval));
addr = ptrval;
}
else
{
/* The trampoline's address is our pointer. */
addr = SYMBOL_VALUE_ADDRESS (tramp_msym);
}
}
store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order, addr);
@ -2508,6 +2535,18 @@ m32c_m16c_pointer_to_address (struct gdbarch *gdbarch,
ptr = SYMBOL_VALUE_ADDRESS (func_msym);
}
}
else
{
int aspace;
for (aspace = 1; aspace <= 15; aspace++)
{
ptr_msym = lookup_minimal_symbol_by_pc ((aspace << 16) | ptr);
if (ptr_msym)
ptr |= aspace << 16;
}
}
}
return ptr;