OpenXiangShan/NEMU

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Super fast RISC-V ISA emulator for XiangShan processor

Stars: 349
Forks: 143
Open beginner issues: 0
Indexed issues: 40
Avg merge: 1d 11h
Merged PRs (30d): 37

Dominant language: C
License: No license data
Last GitHub push: Sep 20, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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40 open issues indexed

[BUG] Sdtrig: tdata1 accepts action=1 (enter Debug Mode) with dmode=0 and without Sdext; a hit then panics NEMU Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

OpenXiangShan/NEMU#1206 · Opened Sep 10, 2026
Sdtrig: tinfo.version reads 0 although mcontrol6 is implemented with the ratified 1.0 layout Open

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

OpenXiangShan/NEMU#1205 · Opened Sep 10, 2026
HLVX: the PMP/PMA stage checks only read permission; execute permission is not required at the physical level Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

OpenXiangShan/NEMU#1204 · Opened Sep 10, 2026
BUG] Smrnmi/Smdbltrp: with mnstatus.NMIE=0, a trap taken from S/U-mode becomes a critical error instead of being delivered Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

OpenXiangShan/NEMU#1203 · Opened Sep 10, 2026
Sdtrig: address triggers compare (and report) the unmasked virtual address when pointer masking is active Open

Difficulty 4/5 3-5 days Newbie friendliness 65/100

OpenXiangShan/NEMU#1202 · Opened Sep 10, 2026
[Matrix][DiffTest] NEMU AMU control event reports mxrm for floating MMA Open

Difficulty 3/5 1-2 days Newbie friendliness 78/100

OpenXiangShan/NEMU#1201 · Opened Sep 7, 2026
[misa] Clearing U does not clear dependent S Open

Difficulty 3/5 1-2 days Newbie friendliness 64/100

OpenXiangShan/NEMU#1198 · Opened Sep 5, 2026
[BUG] With menvcfg.DTE=0, an sstatus write clears mstatus.SIE due to residual SDT Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

OpenXiangShan/NEMU#1188 · Opened Aug 30, 2026
[BUG] aia.c set_hviprios passes Hviprios by value: hviprio1/hviprio2 priorities never reach the stopi/vstopi computation (compiled to a no-op); get_hviprio2 truncates to 4 bits, below the AIA 6-bit minimum Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

OpenXiangShan/NEMU#1184 · Opened Aug 27, 2026
NEMU flat memory masks PBMT=NC instruction-fetch visibility in XiangShan DiffTest Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

OpenXiangShan/NEMU#1180 · Opened Aug 26, 2026
Incorrect handling of reserved bits in the hvictl CSR Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

OpenXiangShan/NEMU#1158 · Opened Aug 18, 2026
[Bug] NEMU VSM decode pattern accepts illegal funct3 encoding, causing difftest mismatch with XiangShan Open

Difficulty 1/5 Under an hour Newbie friendliness 88/100

OpenXiangShan/NEMU#1078 · Opened Jun 17, 2026
NEMU wrongly raises store access fault for CBO instructions on PBMT=NC memory Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

OpenXiangShan/NEMU#1057 · Opened Jun 8, 2026
WFI does not resume execution when some interrupts become pending Open

OpenXiangShan/NEMU#1056 · 1 assignee · Opened Jun 8, 2026
[Bug] Stale hlvx flag after HLVX instruction bypasses pointer masking (PMM) for subsequent stores Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

OpenXiangShan/NEMU#1041 · 1 comment · Opened May 25, 2026
[BUG] SEI injected from M‑mode is encoded as priority 0 instead of 256 Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

OpenXiangShan/NEMU#1039 · 1 comment · Opened May 25, 2026
香山NEMU可以支持RVV的VLEN配置成256吗？ Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

OpenXiangShan/NEMU#998 · Opened Apr 16, 2026
[Bug] Misaligned MMIO access inaccurately raises AddrMisaligned instead of AccessFault Open

Difficulty 2/5 1-3 hours Newbie friendliness 58/100

OpenXiangShan/NEMU#990 · Opened Mar 18, 2026
Does NEMU support rvv? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

OpenXiangShan/NEMU#987 · 3 comments · Opened Feb 8, 2026
Could not print backtrace: libbacktrace could not find executable to open Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

OpenXiangShan/NEMU#970 · 1 comment · Opened Dec 16, 2025
Build Error with `clang20` Because Compiler flag `-c` Clashes with `-E` Open

Difficulty 2/5 1-3 hours Newbie friendliness 62/100

OpenXiangShan/NEMU#925 · 2 comments · Opened Sep 13, 2025
NEMU如何实现串口输入？ Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

OpenXiangShan/NEMU#922 · 5 comments · Opened Aug 20, 2025
香山的NEMU问题，使用NEMU差分测试框架运行 ref和alone，即自身ref模式和alone 进行对比 Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

OpenXiangShan/NEMU#909 · 1 comment · Opened Jun 27, 2025
Proposal: Add a configuration option for RTL-specific difftest Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

OpenXiangShan/NEMU#893 · 2 comments · Opened May 28, 2025
NEMU支持页大小配置吗 Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

OpenXiangShan/NEMU#887 · 8 comments · Opened May 19, 2025
Checkpoint files are not generated Open

Difficulty 4/5 3-5 days Newbie friendliness 32/100

OpenXiangShan/NEMU#873 · 1 comment · Opened May 8, 2025
关于NEMU和NutShell的`pmpaddr`对齐问题 Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

OpenXiangShan/NEMU#868 · 3 comments · Opened May 7, 2025
How to run llama.cpp on NEMU? Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

OpenXiangShan/NEMU#852 · 9 comments · Opened Apr 17, 2025
Encountered Issues in Generating SPEC2006 Checkpoints for RV64GV Open

Difficulty 4/5 3-5 days Newbie friendliness 28/100

OpenXiangShan/NEMU#829 · 2 comments · Opened Mar 12, 2025
CPU soft stuck Issue Encountered When Launching a Virtual Machine in NEMU Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

OpenXiangShan/NEMU#711 · 4 comments · Opened Dec 8, 2024
Segmentation fault when running h264ref_sss with RVV agnostic policy enabled Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

OpenXiangShan/NEMU#393 · Opened Jul 12, 2024
xstatus.vs=OFF, Permit Check Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

OpenXiangShan/NEMU#390 · Opened Jul 11, 2024
NEMU Crashes When Enabling AC_HOST Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

OpenXiangShan/NEMU#365 · Opened Jun 19, 2024
Compilation Failure When Enabling FPU_HOST Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 42/100

OpenXiangShan/NEMU#364 · Opened Jun 19, 2024
请教NEMU中关于PMA地址寄存器初始值以及内存地址划分问题 Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

OpenXiangShan/NEMU#347 · 2 comments · Opened May 24, 2024
0x5C5-0x5E5在香山中为cache instruction register，这部分好像NEMU中没有对应实现？ Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

OpenXiangShan/NEMU#334 · 1 comment · Opened May 13, 2024
NEMU could not trap at misaligned memory access when running standalone Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

OpenXiangShan/NEMU#306 · 1 comment · Opened Apr 11, 2024
Tracing分支的切片在香山的 emu 上运行出错 Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

OpenXiangShan/NEMU#100 · 18 comments · Opened Aug 4, 2022
NEMU支持gdbserver Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

OpenXiangShan/NEMU#88 · Opened Jun 24, 2022
NEMU支持PLIC Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

OpenXiangShan/NEMU#82 · Opened May 8, 2022

OpenXiangShan/NEMU

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