RetroArch snes9x: lxhu v0,s0,v0,0 SIGILL, Illegal instruction #148
Description
RetroArch v1.20.0 (or 2025-01-30_RetroArch.7z nightly) mips32-odbeta snes9x core is crashing in ingenic lxhu instruction.
They use opendingux-gcw0-toolchain.2022-09-22.tar.xz to build odbeta build, which includes commit b7b803b.
Non-odbeta (non-ingenic instructions enabled toolchain) works fine.
Files
snes9x2005_libretro.zip from the nightly build + core.709.zip corefile.
Text
gcw0:~ $ gdb --args /usr/local/bin/retroarch_rg350_odbeta -L /media/data/local/home/.retroarch/cores/snes9x2005_libretro.so /media/data/roms/SFC/Aladdin\ \(USA\).sfc
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Reading symbols from /usr/local/bin/retroarch_rg350_odbeta...
(No debugging symbols found in /usr/local/bin/retroarch_rg350_odbeta)
(gdb) r
Starting program: /media/data/local/bin/retroarch_rg350_odbeta -L /media/data/local/home/.retroarch/cores/snes9x2005_libretro.so /media/data/roms/SFC/Aladdin\ \(USA\).sfc
[INFO] === Build =======================================
[INFO] Capabilities: Т�w�F�wТ�w�K� �w���w�K�ȁ�w���w��������`t�III�
[INFO] Version: 1.20.0
[INFO] Built: Jan 30 2025
[INFO] =================================================
[New LWP 712]
[INFO] [Input]: Found input driver: "sdl_dingux".
[INFO] [Core]: Loading dynamic libretro core from: "/media/data/local/home/.retroarch/cores/snes9x2005_libretro.so"
[INFO] [Overrides]: Core-specific overrides found at "/media/data/local/home/.retroarch/config/Snes9x 2005/Snes9x 2005.cfg".
[INFO] [Config]: Loading config: "/media/data/local/home/.retroarch/retroarch.cfg".
[INFO] [Config]: Appending override config: "/media/data/local/home/.retroarch/config/Snes9x 2005/Snes9x 2005.cfg".
[INFO] [Overrides]: Redirecting save file to "/media/data/local/home/.retroarch/saves/Snes9x 2005/Aladdin (USA).srm".
[INFO] [Overrides]: Redirecting save state to "/media/data/local/home/.retroarch/states/Snes9x 2005/Aladdin (USA).state".
[INFO] [Environ]: GET_LOG_INTERFACE.
[INFO] [Environ]: GET_CORE_OPTIONS_VERSION.
[INFO] [Environ]: RETRO_ENVIRONMENT_SET_CORE_OPTIONS_V2_INTL.
[INFO] [Environ]: GET_PERF_INTERFACE.
[INFO] [Environ]: GET_LOG_INTERFACE.
[INFO] [Environ]: SET_PIXEL_FORMAT: RGB565.
[libretro INFO] Frontend supports RGB565 - will use that instead of XRGB1555.
[INFO] [Content]: Loading content file: "/media/data/roms/SFC/Aladdin (USA).sfc".
[INFO] [Environ]: SET_INPUT_DESCRIPTORS:
[INFO] [Environ]: SET_AUDIO_BUFFER_STATUS_CALLBACK.
[INFO] [SRAM]: Skipping SRAM load.
[INFO] [Core]: Version of libretro API: 1, Compiled against API: 1
[INFO] [Core]: Geometry: 256x224, Aspect: 1.333, FPS: 59.92, Sample rate: 32040.00 Hz.
[INFO] [Video]: Set video size to: 320x240.
[INFO] [Audio]: Set audio input rate to: 32081.31 Hz.
[New LWP 713]
[INFO] [Joypad]: Found joypad driver: "sdl_dingux".
[INFO] [Video]: Found display server: "null".
[INFO] [Audio]: Set audio input rate to: 32081.31 Hz.
[INFO] [ALSA]: Using ALSA version 1.2.5.1
[INFO] [ALSA]: Using FLOAT_LE sample format for PLAYBACK device "default"
[INFO] [ALSA]: Period: 4 periods per buffer (768 frames, 6144 bytes)
[INFO] [ALSA]: Buffer size: 3072 frames (24576 bytes)
[INFO] [ALSA]: Can pause: no.
[INFO] [ALSA]: Initialized PLAYBACK device "default"
[INFO] [Audio]: Started synchronous audio driver.
[INFO] [Playlist]: Loading history file: "/media/data/local/home/.retroarch/content_history.lpl".
[INFO] [Playlist]: Loading history file: "/media/data/local/home/.retroarch/content_music_history.lpl".
[INFO] [Playlist]: Loading history file: "/media/data/local/home/.retroarch/content_image_history.lpl".
[INFO] [Playlist]: Loading favorites file: "/media/data/local/home/.retroarch/content_favorites.lpl".
[INFO] [Playlist]: Written to playlist file: "/media/data/local/home/.retroarch/content_history.lpl".
[INFO] [Environ]: RETRO_ENVIRONMENT_SET_MINIMUM_AUDIO_LATENCY.
[INFO] [Environ]: Setting audio latency to 128 ms.
[INFO] [Audio]: Set audio input rate to: 32081.31 Hz.
[INFO] [ALSA]: Using ALSA version 1.2.5.1
[INFO] [ALSA]: Using FLOAT_LE sample format for PLAYBACK device "default"
[INFO] [ALSA]: Period: 4 periods per buffer (1536 frames, 12288 bytes)
[INFO] [ALSA]: Buffer size: 6144 frames (49152 bytes)
[INFO] [ALSA]: Can pause: no.
[INFO] [ALSA]: Initialized PLAYBACK device "default"
[INFO] [Audio]: Started synchronous audio driver.
[INFO] [Input]: Game Focus => OFF
[LWP 713 exited]
[New LWP 714]
Thread 1 "retroarch_rg350" received signal SIGILL, Illegal instruction.
0x775d8ca8 in ?? () from /media/data/local/home/.retroarch/cores/snes9x2005_libretro.so
(gdb) bt
#0 0x775d8ca8 in ?? () from /media/data/local/home/.retroarch/cores/snes9x2005_libretro.so
warning: GDB can't find the start of the function at 0x775d8ca8.
GDB is unable to find the start of the function at 0x775d8ca8
and thus can't determine the size of that function's stack frame.
This means that GDB may be unable to access that stack frame, or
the frames below it.
This problem is most likely caused by an invalid program counter or
stack pointer.
However, if you think GDB should simply search farther back
from 0x775d8ca8 for code which looks like the beginning of a
function, you can increase the range of the search using the `set
heuristic-fence-post' command.
(gdb) info proc mappings
process 709
Mapped address spaces:
Start Addr End Addr Size Offset objfile
0x400000 0x5f1000 0x1f1000 0x0 /media/data/local/bin/retroarch_rg350_odbeta
0x601000 0x607000 0x6000 0x1f1000 /media/data/local/bin/retroarch_rg350_odbeta
0x607000 0x8d9000 0x2d2000 0x0 [heap]
0x76634000 0x76672000 0x3e000 0x0
0x76681000 0x767a3000 0x122000 0x0
0x767a3000 0x767a4000 0x1000 0x0
0x767a4000 0x769a3000 0x1ff000 0x0
0x769c1000 0x769dd000 0x1c000 0x0 /dev/dri/card1
0x769dd000 0x769f9000 0x1c000 0x0 /dev/dri/card1
0x769f9000 0x76a15000 0x1c000 0x0 /dev/dri/card1
0x76a15000 0x77592000 0xb7d000 0x0
0x77592000 0x77626000 0x94000 0x0 /media/data/local/home/.retroarch/cores/snes9x2005_libretro.so
0x77626000 0x77635000 0xf000 0x0
0x77635000 0x7763d000 0x8000 0x93000 /media/data/local/home/.retroarch/cores/snes9x2005_libretro.so
0x7763d000 0x776f6000 0xb9000 0x0
0x776f6000 0x776f7000 0x1000 0x0
0x776f7000 0x778f6000 0x1ff000 0x0
0x778f6000 0x778f9000 0x3000 0x0 /usr/lib/libts.so.0.10.4
0x778f9000 0x77909000 0x10000 0x0
0x77909000 0x7790a000 0x1000 0x3000 /usr/lib/libts.so.0.10.4
0x7790a000 0x7791b000 0x11000 0x0 /usr/lib/libdrm.so.2.4.0
0x7791b000 0x7792a000 0xf000 0x0
0x7792a000 0x7792b000 0x1000 0x10000 /usr/lib/libdrm.so.2.4.0
0x7792b000 0x77a0b000 0xe0000 0x0 /usr/lib/libiconv.so.2.6.0
0x77a0b000 0x77a0c000 0x1000 0xe0000 /usr/lib/libiconv.so.2.6.0
0x77a0c000 0x77a96000 0x8a000 0x0 /usr/lib/libuClibc-1.0.38.so
0x77a96000 0x77aa5000 0xf000 0x0
--Type <RET> for more, q to quit, c to continue without paging--c
0x77aa5000 0x77aa6000 0x1000 0x89000 /usr/lib/libuClibc-1.0.38.so
0x77aa6000 0x77aa8000 0x2000 0x8a000 /usr/lib/libuClibc-1.0.38.so
0x77aa8000 0x77abe000 0x16000 0x0
0x77abe000 0x77ae5000 0x27000 0x0 /usr/lib/libgcc_s.so.1
0x77ae5000 0x77af5000 0x10000 0x0
0x77af5000 0x77af6000 0x1000 0x27000 /usr/lib/libgcc_s.so.1
0x77af6000 0x77cf1000 0x1fb000 0x0 /usr/lib/libstdc++.so.6.0.29
0x77cf1000 0x77d00000 0xf000 0x0
0x77d00000 0x77d0d000 0xd000 0x1fa000 /usr/lib/libstdc++.so.6.0.29
0x77d0d000 0x77d10000 0x3000 0x207000 /usr/lib/libstdc++.so.6.0.29
0x77d10000 0x77d13000 0x3000 0x0
0x77d13000 0x77e00000 0xed000 0x0 /usr/lib/libasound.so.2.0.0
0x77e00000 0x77e0f000 0xf000 0x0
0x77e0f000 0x77e14000 0x5000 0xec000 /usr/lib/libasound.so.2.0.0
0x77e14000 0x77e56000 0x42000 0x0 /usr/lib/libSDL-1.2.so.0.11.5
0x77e56000 0x77e66000 0x10000 0x0
0x77e66000 0x77e67000 0x1000 0x42000 /usr/lib/libSDL-1.2.so.0.11.5
0x77e67000 0x77e69000 0x2000 0x0
0x77e69000 0x77e8c000 0x23000 0x0 /usr/lib/libudev.so.1.6.3
0x77e8c000 0x77e9b000 0xf000 0x0
0x77e9b000 0x77e9d000 0x2000 0x22000 /usr/lib/libudev.so.1.6.3
0x77e9d000 0x77eb3000 0x16000 0x0 /usr/lib/libz.so.1.2.11
0x77eb3000 0x77ec2000 0xf000 0x0
0x77ec2000 0x77ec3000 0x1000 0x15000 /usr/lib/libz.so.1.2.11
0x77ec3000 0x77eca000 0x7000 0x0 /usr/lib/ld-uClibc-1.0.38.so
0x77ed0000 0x77ed6000 0x6000 0x0 /dev/snd/pcmC0D0p
0x77ed6000 0x77ed9000 0x3000 0x0
0x77ed9000 0x77eda000 0x1000 0x6000 /usr/lib/ld-uClibc-1.0.38.so
0x77eda000 0x77edb000 0x1000 0x7000 /usr/lib/ld-uClibc-1.0.38.so
0x7fe95000 0x7feb6000 0x21000 0x0 [stack]
0x7fefd000 0x7fefe000 0x1000 0x0
0x7ff32000 0x7ff33000 0x1000 0x0 [vvar]
0x7ff33000 0x7ff34000 0x1000 0x0 [vdso]
(gdb) x/10i 0x775d8c90
0x775d8c90: jr v0
0x775d8c94: nop
0x775d8c98: lbu v1,-28636(a1)
0x775d8c9c: bnez v1,0x775d8d30
0x775d8ca0: nop
0x775d8ca4: andi s0,s0,0xffff
=> 0x775d8ca8: 0x72021168
0x775d8cac: lw ra,28(sp)
0x775d8cb0: lw s0,24(sp)
0x775d8cb4: jr ra
0x775d8cb8: addiu sp,sp,32
(gdb) info registers
zero at v0 v1 a0 a1 a2 a3
R0 00000000 00000001 006b3368 76d1bcd8 776c76f8 776d7ef8 00000000 776dc274
t0 t1 t2 t3 t4 t5 t6 t7
R8 0000028f 00000000 00000005 00000001 00000003 00000003 00000000 776dc274
s0 s1 s2 s3 s4 s5 s6 s7
R16 00000073 776dc2c4 776dc194 7763c070 77638590 77669ba4 ffffff80 776dbbe4
t8 t9 k0 k1 gp sp s8 ra
R24 00000014 775d8c04 00000001 00000000 77644460 7feb49b8 776dc158 775ac230
status lo hi badvaddr cause pc
00000413 00003210 00000000 006b33db 00800010 775d8ca8
fcsr fir restart
13800024 00330000 00000000
Disassembling with toolchain's objdump:
46c9c: 14600024 bnez v1,46d30 <retro_set_environment-0x2fc38>
46ca0: 00000000 nop
46ca4: 3210ffff andi s0,s0,0xffff
46ca8: 72021168 lxhu v0,s0,v0,0 ← ← ← ← ← ← ← ← ← ←
46cac: 8fbf001c lw ra,28(sp)
46cb0: 8fb00018 lw s0,24(sp)
46cb4: 03e00008 jr ra
46cb8: 27bd0020 addiu sp,sp,32