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Diffstat (limited to 'gitlab/issues/target_arm/host_missing/accel_missing/952.toml')
| -rw-r--r-- | gitlab/issues/target_arm/host_missing/accel_missing/952.toml | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/gitlab/issues/target_arm/host_missing/accel_missing/952.toml b/gitlab/issues/target_arm/host_missing/accel_missing/952.toml new file mode 100644 index 00000000..6bf85253 --- /dev/null +++ b/gitlab/issues/target_arm/host_missing/accel_missing/952.toml @@ -0,0 +1,109 @@ +id = 952 +title = "qemu: uncaught target signal 5 (Trace/breakpoint trap)" +state = "closed" +created_at = "2022-03-31T09:08:00.588Z" +closed_at = "2023-03-14T14:56:06.221Z" +labels = ["linux-user", "target: arm", "workflow::Needs Info"] +url = "https://gitlab.com/qemu-project/qemu/-/issues/952" +host-os = "n/a" +host-arch = "X86_64" +qemu-version = "qemu-arm version 6.2.0" +guest-os = "n/a" +guest-arch = "n/a" +description = """I'm getting core dumped when running the attached a.out_err binary in qemu, but when using Gdb to remote-debug the program, it exited normally. will appreciate if you can help look into this qemu issue. + +And I found that QEMU's 32-bit arm linux-user mode doesn't correctly turn guest BKPT insns into SIGTRAP signal. + +0xa602 <_start> movs r0, #22 + 0xa604 <_start+2> addw r1, pc, #186 ; 0xba +0xa608 <_start+6> bkpt 0x00ab + +$readelf -h hello + +ELF Header: + Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 + Class: ELF32 + Data: 2's complement, little endian + Version: 1 (current) + OS/ABI: UNIX - System V + ABI Version: 0 + Type: EXEC (Executable file) + Machine: ARM + Version: 0x1 + Entry point address: 0xa603 + Start of program headers: 52 (bytes into file) + Start of section headers: 144128 (bytes into file) + Flags: 0x5000200, Version5 EABI, soft-float ABI + Size of this header: 52 (bytes) + Size of program headers: 32 (bytes) + Number of program headers: 5 + Size of section headers: 40 (bytes) + Number of section headers: 16 + Section header string table index: 14 + +And I have check that the bug(https://bugs.launchpad.net/qemu/+bug/1873898) is fixed. + +But it's coredump. + +I found that bkpt instruction is not recognized, the bkpt is in 0x0000a608. + +host： +``` +$qemu-arm -g 12345 hello +``` +service: +``` +$gdb-multiarch hello +(gdb) target remote localhost:12345 +Remote debugging using localhost:12345 +0x0000a602 in _start () +(gdb) ni +0x0000a604 in _start () +(gdb) +0x0000a608 in _start () +(gdb) +0x0000a608 in _start () +``` +Another way to check: +``` +$gdb qemu-arm +(gdb) run hello +(gdb) bt +#0 0x00007ffff79474ba in __GI___sigsuspend (set=set@entry=0x7fffffffd9d8) at ../sysdeps/unix/sysv/linux/sigsuspend.c:26 +#1 0x000055555573bfff in dump_core_and_abort (target_sig=target_sig@entry=5) at ../linux-user/signal.c:772 +#2 0x000055555573c3c8 in handle_pending_signal (cpu_env=cpu_env@entry=0x555555da5940, sig=sig@entry=5, k=k@entry=0x555555e60e00) at ../linux-user/signal.c:1099 +#3 0x000055555573de8c in process_pending_signals (cpu_env=cpu_env@entry=0x555555da5940) at ../linux-user/signal.c:1175 +#4 0x0000555555622070 in cpu_loop (env=0x555555da5940) at ../linux-user/arm/cpu_loop.c:472 +#5 0x0000555555603cf4 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at ../linux-user/main.c:883 +(gdb) up +#1 0x000055555573bfff in dump_core_and_abort (target_sig=target_sig@entry=5) at ../linux-user/signal.c:772 +772 sigsuspend(&act.sa_mask); +(gdb) +#2 0x000055555573c3c8 in handle_pending_signal (cpu_env=cpu_env@entry=0x555555da5940, sig=sig@entry=5, k=k@entry=0x555555e60e00) at ../linux-user/signal.c:1099 +1099 dump_core_and_abort(sig); +(gdb) +#3 0x000055555573de8c in process_pending_signals (cpu_env=cpu_env@entry=0x555555da5940) at ../linux-user/signal.c:1175 +1175 handle_pending_signal(cpu_env, sig, &ts->sync_signal); +(gdb) +#4 0x0000555555622070 in cpu_loop (env=0x555555da5940) at ../linux-user/arm/cpu_loop.c:472 +472 process_pending_signals(env); +(gdb) l +467 default: +468 error: +469 EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\\n", trapnr); +470 abort(); +471 } +472 process_pending_signals(env); +473 } +474 } +475 +476 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) +(gdb) p cpu_exec(cs) +$2 = 7 +``` +Here process_pending_signals(env) gives SIGTRAP?? + +Here is my binary: +[hello](/uploads/7225e1f1c5a61ace40f90d5d2401a758/hello)""" +reproduce = "n/a" +additional = "n/a" |