On 09/10/11 01:45 AM, Blue Swirl wrote:
I don't know enough about SPARC32 architecture to know if that gives more useful information... I don't see the 0x4c value in my log file. I tried turning on DEBUG_MMU, but stopped when my log file hit 4GB and I hadn't hit the stopping point yet.
Any ideas for other things to try or set for more debugging?
Since this is repeatable, you could try something like this (untested): diff --git a/target-sparc/op_helper.c b/target-sparc/op_helper.c index d1a8dd9..2594bbd 100644 --- a/target-sparc/op_helper.c +++ b/target-sparc/op_helper.c @@ -1836,6 +1836,11 @@ uint64_t helper_ld_asi(target_ulong addr, int asi, int size, int sign) ret = mmu_probe(env, addr, mmulev); DPRINTF_MMU("mmu_probe: 0x%08x (lev %d) -> 0x%08" PRIx64 "\n", addr, mmulev, ret);
if (addr == 0xf5901400) {printf("mmu_probe: 0x%08x (lev %d) -> 0x%08" PRIx64 "\n",addr, mmulev, ret);dump_mmu(stdout, fprintf, env);} } break; case 4: /* read MMU regs */
Tweaking that a little, I now find myself at pc=0xf01850c8, because that is the current instruction when the page tables write out.
(qemu) info cpus * CPU #0: pc=0xf01850c8 npc=0xf01850cc thread_id=3483 (qemu) info registers pc: f01850c8 npc: f01850cc General Registers: %g0-7: 00000000 f024dc00 00000003 f5a6b104 00000004 fbf45b80 f0041000 f5dd0500
Current Register Window: %o0-7: 00000000 f026a2d8 f5901000 f5901200 f026a2dc f018505c f026a270 f005c5a4 %l0-7: 04001fc5 f00436ac 000003a6 00000020 00000000 00000009 00000000 00000001 %i0-7: f026a6c0 f026a40c f5901000 000003a6 00000002 f026a384 f026a2e8 f005cefc
Floating Point Registers: %f00: 000000000.000000 000000000.000000 -NaN -NaN %f04: -NaN -NaN -NaN -NaN .... %f28: -NaN -NaN -NaN -NaN psr: 04401fe5 (icc: -Z-- SPE: SPE) wim: 00000002 fsr: 00080000 y: 00000000 (qemu) x /30i 0xf01850a0 0xf01850a0: and %o0, 3, %o3 0xf01850a4: cmp %o3, 2 0xf01850a8: bne 0xf01850c0 0xf01850ac: srl %o2, 0xc, %o3 0xf01850b0: and %o3, 0x3f, %o3 0xf01850b4: sll %o3, 8, %o3 0xf01850b8: b 0xf01850c8 0xf01850bc: add %o0, %o3, %o0 0xf01850c0: mov %o2, %o3 0xf01850c4: lda [ %o3 ] #ASI_M_FLUSH_PROBE, %o0 0xf01850c8: srl %o0, 0x18, %o3 0xf01850cc: andcc %o3, 7, %o3 0xf01850d0: be 0xf01850dc 0xf01850d4: nop 0xf01850d8: sta %g0, [ %o2 ] #ASI_M_FLUSH_PROBE 0xf01850dc: mov 0x300, %o2 0xf01850e0: cmp %o1, 0 0xf01850e4: be 0xf01850f0 0xf01850e8: lda [ %o2 ] #ASI_M_MMUREGS, %o2 0xf01850ec: st %o2, [ %o1 ] 0xf01850f0: retl 0xf01850f4: nop 0xf01850f8: sethi %hi(0x10003000), %o2 0xf01850fc: or %o2, 0x18, %o2 ! 0x10003018 0xf0185100: retl 0xf0185104: lda [ %o2 ] #ASI_M_BYPASS, %o0 0xf0185108: unimp 0 0xf018510c: unimp 0 0xf0185110: unimp 0 0xf0185114: unimp 0
Now I know reading fragments of assembly are lots of fun, so I've attached the dump_mmu results, which will hopefully also be useful.
Does that help point to a next step?
Thanks! Nathan