On Sun, Apr 10, 2011 at 4:44 PM, Blue Swirl <blauwir...@gmail.com> wrote: > On Sun, Apr 10, 2011 at 5:09 PM, Artyom Tarasenko <atar4q...@gmail.com> wrote: >> On Sun, Apr 10, 2011 at 3:24 PM, Aurelien Jarno <aurel...@aurel32.net> wrote: >>> On Sun, Apr 10, 2011 at 02:29:59PM +0200, Artyom Tarasenko wrote: >>>> Trying to boot some proprietary OS I get qemu-system-sparc64 crash with a >>>> >>>> tcg/tcg.c:1892: tcg fatal error >>>> >>>> error message. >>>> >>>> It looks like it can be a platform independent bug though, because >>>> when a '-singlestep' option IS present, qemu doesn't crash and seems >>>> to translate the code properly. >>>> >>>> (gdb) bt >>>> #0 0x00000032c2e327f5 in raise () from /lib64/libc.so.6 >>>> #1 0x00000032c2e33fd5 in abort () from /lib64/libc.so.6 >>>> #2 0x000000000051933d in tcg_reg_alloc_call (s=<value optimized out>, >>>> def=0x89d340, opc=INDEX_op_call, args=0x10acc98, dead_iargs=3) at >>>> qemu/tcg/tcg.c:1892 >>>> #3 0x000000000051a557 in tcg_gen_code_common (s=0x10b8940, >>>> gen_code_buf=0x40338b60 "I\213n@H\213] 3\355I\211\256\220") at >>>> qemu/tcg/tcg.c:2099 >>>> #4 tcg_gen_code (s=0x10b8940, gen_code_buf=0x40338b60 "I\213n@H\213] >>>> 3\355I\211\256\220") at qemu/tcg/tcg.c:2142 >>>> #5 0x00000000004d38f1 in cpu_sparc_gen_code (env=0x10cce10, >>>> tb=0x7fffe91bc218, gen_code_size_ptr=0x7fffffffd9b4) at >>>> qemu/translate-all.c:93 >>>> #6 0x00000000004d1fd7 in tb_gen_code (env=0x10cce10, pc=18868776, >>>> cs_base=18868780, flags=15, cflags=0) at qemu/exec.c:989 >>>> #7 0x00000000004d4029 in tb_find_slow (env1=<value optimized out>) at >>>> qemu/cpu-exec.c:167 >>>> #8 tb_find_fast (env1=<value optimized out>) at cpu-exec.c:194 >>>> #9 cpu_sparc_exec (env1=<value optimized out>) at qemu/cpu-exec.c:556 >>>> #10 0x0000000000408868 in tcg_cpu_exec () at qemu/cpus.c:1066 >>>> #11 cpu_exec_all () at qemu/cpus.c:1102 >>>> #12 0x000000000053c756 in main_loop (argc=<value optimized out>, >>>> argv=<value optimized out>, envp=<value optimized out>) at >>>> qemu/vl.c:1430 >>>> >>>> I inspected ts->val_type causing the abort() case and it turned out to be >>>> 0. >>>> >>>> The last lines of qemu.log (without -singlestep) >>>> IN: >>>> 0x00000000011fe9f0: rdpr %pstate, %g1 >>>> 0x00000000011fe9f4: wrpr %g1, 2, %pstate >>>> -------------- >>>> IN: >>>> 0x00000000011fe9f8: ldub [ %o0 ], %o1 >>>> 0x00000000011fe9fc: mov %o1, %o2 >>>> 0x00000000011fea00: rdpr %tick, %o3 >>>> 0x00000000011fea04: cmp %o1, %o2 >>>> 0x00000000011fea08: be %icc, 0x11fea00 >>>> 0x00000000011fea0c: ldub [ %o0 ], %o2 >>>> >>>> Search PC... >>>> Search PC... >>>> Search PC... >>>> Search PC... >>>> Search PC... >>>> Search PC... >>>> -------------- >>>> IN: >>>> 0x00000000011fe9f8: ldub [ %o0 ], %o1 >>>> 0x00000000011fe9fc: mov %o1, %o2 >>>> 0x00000000011fea00: rdpr %tick, %o3 >>>> 0x00000000011fea04: cmp %o1, %o2 >>>> 0x00000000011fea08: be %icc, 0x11fea00 >>>> 0x00000000011fea0c: ldub [ %o0 ], %o2 >>>> >>>> 110521: Data Access MMU Miss (v=0068) pc=00000000011fe9f8 >>>> npc=00000000011fe9fc SP=000000000180ae41 >>>> pc: 00000000011fe9f8 npc: 00000000011fe9fc >>>> >>>> IN: >>>> 0x00000000011fea00: rdpr %tick, %o3 >>>> 0x00000000011fea04: cmp %o1, %o2 >>>> 0x00000000011fea08: be %icc, 0x11fea00 >>>> 0x00000000011fea0c: ldub [ %o0 ], %o2 >>>> -------------- >>>> IN: >>>> 0x00000000011fea10: brz,pn %o2, 0x11fe9f8 >>>> 0x00000000011fea14: mov %o2, %o4 >>>> -------------- >>>> IN: >>>> 0x00000000011fea18: rdpr %tick, %o5 >>>> 0x00000000011fea1c: cmp %o2, %o4 >>>> 0x00000000011fea20: be %icc, 0x11fea18 >>>> 0x00000000011fea24: ldub [ %o0 ], %o4 >>>> -------------- >>>> IN: >>>> 0x00000000011fea28: brz,pn %o4, 0x11fe9f4 >>>> 0x00000000011fea2c: wrpr %g0, %g1, %pstate >>>> <EOF> >>>> >>>> The crash is 100% reproducible and happens always on the same place, >>>> so it's probably a pure TCG issue, not related on getting the >>>> external/timer interrupts. >>>> >>>> Do you need any additional info? >>>> >>> >>> What would be interesting would be to get the corresponding TCG code >>> from qemu.log (-d op,op_opt). >> >> >> OP: >> ---- 0x11fea28 >> ld_i64 tmp6,regwptr,$0x20 >> movi_i64 cond,$0x0 >> movi_i64 tmp8,$0x0 >> brcond_i64 tmp6,tmp8,ne,$0x0 >> movi_i64 cond,$0x1 >> set_label $0x0 >> >> ---- 0x11fea2c >> movi_i64 tmp7,$0x0 >> xor_i64 tmp0,tmp7,g1 >> movi_i64 pc,$0x11fea2c >> movi_i64 tmp8,$compute_psr >> call tmp8,$0x0,$0 >> movi_i64 tmp8,$0x0 >> brcond_i64 cond,tmp8,eq,$0x1 >> movi_i64 npc,$0x11fe9f4 >> br $0x2 >> set_label $0x1 >> movi_i64 npc,$0x11fea30 >> set_label $0x2 >> movi_i64 tmp8,$wrpstate >> call tmp8,$0x0,$0,tmp0 >> mov_i64 pc,npc >> movi_i64 tmp8,$0x4 >> add_i64 npc,npc,tmp8 >> exit_tb $0x0 >> >> OP after liveness analysis: >> ---- 0x11fea28 >> ld_i64 tmp6,regwptr,$0x20 >> movi_i64 cond,$0x0 >> movi_i64 tmp8,$0x0 >> brcond_i64 tmp6,tmp8,ne,$0x0 >> movi_i64 cond,$0x1 >> set_label $0x0 >> >> ---- 0x11fea2c >> nopn $0x2,$0x2 >> nopn $0x3,$0x68,$0x3 >> movi_i64 pc,$0x11fea2c >> movi_i64 tmp8,$compute_psr >> call tmp8,$0x0,$0 >> movi_i64 tmp8,$0x0 >> brcond_i64 cond,tmp8,eq,$0x1 >> movi_i64 npc,$0x11fe9f4 >> br $0x2 >> set_label $0x1 >> movi_i64 npc,$0x11fea30 >> set_label $0x2 >> movi_i64 tmp8,$wrpstate >> call tmp8,$0x0,$0,tmp0 >> mov_i64 pc,npc >> movi_i64 tmp8,$0x4 >> add_i64 npc,npc,tmp8 >> exit_tb $0x0 >> end >> >> Does it mean the last block is processed correctly and the crash >> happens on the next instruction which doesn't make it to the log? >> The next instruction would be a >> >> 0x00000000011fea30: retl >> >> Since it's a branch instruction I guess this would also be a tcg block >> boundary. > > Because abort() was called from tcg_reg_alloc_call, I'd say 'retl' > (synthetic op for 'jmpl %o8 + 8, %g0') was the problem.
Any idea why? retl is not a rare instruction... -- Regards, Artyom Tarasenko solaris/sparc under qemu blog: http://tyom.blogspot.com/