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In case the intention is to debug the early kernel >>> boot, >>> and not the decompressor, e.g., put a breakpoint on some kernel >>> function and see all the invocations, one has to skip the >>> decompressor. >>> >>> There are many ways to do this, and so far people wrote private >>> scripts >>> or memorized certain command sequences. >>> >>> Make it work out of the box like this: >>> >>>     $ gdb -ex 'target remote :6812' -ex 'source vmlinux-gdb.py' >>> vmlinux >>>     Remote debugging using :6812 >>>     0x0000000000010000 in ?? () >>>     (gdb) lx-symbols >>>     loading vmlinux >>>     (gdb) x/i $pc >>>     => 0x3ffe0100000 :    lghi    %r2,0 >>> >>> Implement this by reading the address of the jump_to_kernel() >>> function >>> from the lowcore, and step until DAT is turned on. >> >> Why do you need to stepi until there? SW breakpoint will likely need >> to >> output of the decompressor first. No HW breakpoint available? Or >> missing >> address? > > jump_to_kernel is ; the code from this patch puts > an SW breakpoint there, and this works fine. > > However, the problem is that once jump_to_kernel is reached, even > though the kernel is already in place, paging is still off. > > jump_to_kernel contains a single "lpswe" instruction, which both jumps > to kernel and enables paging, therefore, we must "stepi" over it. The > loop is there just for future-proofing. Everything happens very > quickly, there are no thousands of "stepi"s. > OK, makes sense to me now. >>> Signed-off-by: Ilya Leoshkevich >>> --- >>>  scripts/gdb/linux/symbols.py | 26 ++++++++++++++++++++++++++ >>>  1 file changed, 26 insertions(+) >>> >>> diff --git a/scripts/gdb/linux/symbols.py >>> b/scripts/gdb/linux/symbols.py >>> index 2332bd8eddf1..6edb99221675 100644 >>> --- a/scripts/gdb/linux/symbols.py >>> +++ b/scripts/gdb/linux/symbols.py >>> @@ -84,6 +84,30 @@ def get_kerneloffset(): >>>      return None >>>   >>>   >>> +def is_in_s390_decompressor(): >>> +    # DAT is always off in decompressor. Use this as an indicator. >>> +    # Note that in the kernel, DAT can be off during kexec() or >>> restart. >>> +    # Accept this imprecision in order to avoid complicating >>> things. >>> +    # It is unlikely that someone will run lx-symbols at these >>> points. >>> +    pswm = int(gdb.parse_and_eval("$pswm")) >>> +    return (pswm & 0x0400000000000000) == 0 >>> + >>> + >>> +def skip_decompressor(): >>> +    if utils.is_target_arch("s390"): >>> +        if is_in_s390_decompressor(): >>> +            # The address of the jump_to_kernel function is >>> statically placed >>> +            # into svc_old_psw.addr (see ipl_data.c); read it from >>> there. DAT >>> +            # is off, so we do not need to care about lowcore >>> relocation. >>> +            svc_old_pswa = 0x148 >>> +            jump_to_kernel = int(gdb.parse_and_eval("*(unsigned >>> long long *)" + >>> +                                                    >>> hex(svc_old_pswa))) >>> +            gdb.execute("tbreak *" + hex(jump_to_kernel)) >>> +            gdb.execute("continue") >>> +            while is_in_s390_decompressor(): >>> +                gdb.execute("stepi") >>> + >>> + >>>  class LxSymbols(gdb.Command): >>>      """(Re-)load symbols of Linux kernel and currently loaded >>> modules. >>>   >>> @@ -204,6 +228,8 @@ lx-symbols command.""" >>>              saved_state['breakpoint'].enabled = >>> saved_state['enabled'] >>>   >>>      def invoke(self, arg, from_tty): >>> +        skip_decompressor() >>> + >>>          self.module_paths = >>> [os.path.abspath(os.path.expanduser(p)) >>>                               for p in arg.split()] >>>          self.module_paths.append(os.getcwd()) >> >> Otherwise, this series looks good to me and could be picked up if >> there >> is no better way to reach the end of the decompressor. > > Could you please ack this patch if the explanation above is > satisfactory? We would like to take this series via the s390 tree, > if possible. > Sorry, should have also read your cover letter: Acked-by: Jan Kiszka Jan -- Siemens AG, Foundational Technologies Linux Expert Center