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.