DDB_ONPANIC. Lets user ignore breaks but enter DDB on panic. Intended
for machines where debug on panic is useful, but DDB entry is not,
(public-access console, or terminal-servers which send spurious breaks)
Add new ddb hook, console_debugger(), which decides whether or not to
ignore console ddb requests. Console drivers should be updated to call
console_debugger(), not Debugger(), in response to serial-console
break or ddb keyboard sequence.
emulation in db_run.c:
- re-arrange `db_*_single_step()' and `db_*_temp_breakpoint()' -
which are only used in the `SOFTWARE_SSTEP' case - so these
are available to the KGDB code.
- make other code in db_run.c conditional on `DDB'.
UVM was written by chuck cranor <chuck@maria.wustl.edu>, with some
minor portions derived from the old Mach code. i provided some help
getting swap and paging working, and other bug fixes/ideas. chuck
silvers <chuq@chuq.com> also provided some other fixes.
this is the rest of the MI portion changes.
this will be KNF'd shortly. :-)
overflow (always hated that).
replaced "/m" flag with:
/a == show process address info
/n == show normal process info [currently the default]
/w == show process wait/emul info
is no hardware support for single-stepping):
- Fix branch prediction and delay slot computation (for the MIPS).
- Correctly deal with branch taken vs. branch not taken cases, and
self-branches.
- General cleanup, including types botches.
Partially from Mach 3, with a bunch of cleanup work by me.
formats in DDB:
- Reverse the sense of the symbol format #ifdef... i.e. instead of
"#ifndef DB_NO_AOUT", use "#ifdef DB_AOUT_SYMBOLS". This is pulled
in from <machine/db_machdep.h>.
- Change the signature of X_db_sym_init(). Instead of int * and char *,
it now takes void *'s for the start and end of the symbol table.
- In X_db_sym_init(), check that the pointer to the beginning of
the symbol table is aligned.
- X_db_symbol_values() now takes a "db_symtab_t *symtab" argument.
that the common case can be handled with no hassles on all machines.
fix up the various internal variables which are also exported via sysctl
(and which therefore must be 'int's) to do the right thing via a special
read/write function.
the kernel panics. It may be initialized to 0 with the kernel option
"DDB_ONPANIC=0", and is patchable. It may be changed at run-time
from within the DDB (as a DDB variable) or via the ddb.onpanic sysctl
node.
Export all DDB built-in variables via sysctl.
jonathan