On Sun, Apr 10, 2011 at 8:48 PM, Artyom Tarasenko <atar4q...@gmail.com> wrote: > 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...
Sorry, calls are generated for helpers, so it's not 'jmpl' but the call to wrpstate helper.