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[Qemu-devel] sparc32 remote debugger mem access problems with 0.9.1

From: M . Stein
Subject: [Qemu-devel] sparc32 remote debugger mem access problems with 0.9.1
Date: Thu, 14 Feb 2008 09:22:00 +0100


recently I have updated my qemu from 0.9.0 to 0.9.1 and had problems
with the remote debugger memory access. Especially the command

x /10i 0x4000

doesn't work, even if the PC is 0x4000.

I have tracked down the problem till target-sparc/translate.c, where the
following calls are done:

    if (get_physical_address(env, &phys_addr, &prot, &access_index, addr,
2, 0) != 0)
        if (get_physical_address(env, &phys_addr, &prot, &access_index,
addr, 0, 0) != 0)
            return -1;

In 0.9.0 the last arg to get_physical_address was 'is_user', now it is
'mmu_idx'. is_user
is now evaluated in target-sparc/helper.c:get_physical_adress by

   is_user = mmu_idx == MMU_USER_IDX;

So if 'mmu_idx' ist still 0 (and MMU_USER_IDX is also 0) the resulting
'is_user' is TRUE
and the later

   error_code = access_table[*access_index][access_perms];
    if (error_code && !((env->mmuregs[0] & MMU_NF) && is_user))
        return error_code;

always fails with access_index 0/2 and access_perms 7.

I have changed the last arg of get_physical_address to 1 and all works as

Thanks for your attention!


Matthias Stein,
GOM Gesellschaft fuer Optische Messtechnik mbH,
Mittelweg 7-8, 38106 Braunschweig, Germany
E-mail: address@hidden, Internet: http://www.gom.com
Tel.: +49 (0)531 39029-0, Fax: +49 (0)531 39029-15
Amtsgericht Handelsregister Braunschweig, HRB-Nr.: 3131
Geschaeftsfuehrer: Dr.-Ing. K. Galanulis, Dr.-Ing. D. Winter

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