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rv8-io
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Description

RISC-V simulator for x86-64

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rv8

RISC-V simulator for x86-64

Build Status Coverity Status License: MIT Donate

rv8 is a RISC-V simulation suite comprising a high performance x86-64 binary translator, a user mode simulator, a full system emulator, an ELF binary analysis tool and ISA metadata:

  • rv-jit - user mode x86-64 binary translator
  • rv-sim - user mode system call proxy simulator
  • rv-sys - full system emulator with soft MMU
  • rv-bin - ELF disassembler and histogram tool
  • rv-meta - code and documentation generator

The rv8 simulator suite contains libraries and command line tools for creating instruction opcode maps, C headers and source containing instruction set metadata, instruction decoders, a JIT assembler, LaTeX documentation, a metadata based RISC-V disassembler, a histogram tool for generating statistics on RISC-V ELF executables, a RISC-V proxy syscall simulator, a RISC-V full system emulator that implements the RISC-V 1.9.1 privileged specification and an x86-64 binary translator.

rv8 binary translation

RISC-V to x86-64 binary translator

The rv8 binary translation engine works by interpreting code while profiling it for hot paths. Hot paths are translated on the fly to native code. The translation engine maintains a call stack to allow runtime inlining of hot functions. A jump target cache is used to accelerate returns and indirect calls through function pointers. The translator supports hybrid binary translation and interpretation to handle instructions that do not have native translations. Currently ‘IM’ code is translated and ‘AFD’ is interpreted. The translator supports RVC compressed code.

The rv8 binary translator supports a number of simple optimisations:

  • Hybrid interpretation and compilation of hot code paths
  • Incremental translation with dynamic trace linking
  • Inline caching of function calls in hot code paths
  • L1 jump target cache for indirect calls and returns
  • Macro-op fusion for common RISC-V instruction sequences

RISC-V full system emulator

The rv8 suite includes a full system emulator that implements the RISC-V privileged ISA with support for interrupts, MMIO (memory mapped input output) devices, a soft MMU (memory management unit) with separate instruction and data TLBs (translation lookaside buffers). The full system emulator has a simple integrated debugger that allows setting breakpoints, single stepping and disassembling instructions as they are executed.

The rv8 full system emulator has the following features:

  • RISC-V IMAFD Base plus Privileged ISA (riscv32 and riscv64)
  • Simple integrated debug command line interface
  • Histograms (registers, instruction and program counter frequency)
  • Soft MMU supporting sv32, sv39, sv48 page translation modes
  • Abstract MMIO device interface for device emulation
  • Extensible interpreter generated from ISA metadata
  • Protected address space

RISC-V user mode simulator

The rv8 user mode simulator is a single address space implementation of the RISC-V ISA that implements a subset of the RISC-V Linux syscall ABI (application binary interface) and delegates system calls to the underlying native host operating system. The user mode simulator can run RISC-V Linux binaries on non-Linux operating systems via system call emulation. The current user mode simulator implements a small number of system calls to allow running RISC-V Linux ELF static binaries.

The rv8 user mode simulator has the following features:

  • RISC-V IMAFD Base ISA (riscv32 and riscv64)
  • Simple integrated debug command line interface
  • A small set of emulated Linux system calls for simple file IO
  • Extensible interpreter generated from ISA metadata
  • Instruction logging mode for tracing program execution
  • Shared address space
    • 0x000000000000 - 0x000000000fff
      (zero)
    • 0x000000001000 - 0x7ffdffffffff
      (guest)
    • 0x7ffe00000000 - 0x7fffffffffff
      (host)

Project Goals

The future goals of the rv8 project are:

  • Concise metadata representing the RISC-V ISA
  • Tools for metadata-based generation of source and documentation
  • High performance emulation, sandboxing and binary translation
  • RISC-V-(n) → RISC-V-(n+1)
  • RISC-V-(n) → Intel i7 / AMD64 + AVX-512
  • RISC-V Linux ABI emulation on MacOS, Windows, Linux and *BSD
  • RISC-V Linux ABI randomisation and entropy coding
  • RISC-V Specification undefined behaviour investigation
  • RISC-V Virtualization and memory protection investigation

Supported Platforms

  • Target
    • RV32IMAFDC
    • RV64IMAFDC
    • Privilged ISA 1.9.1
  • Host
    • Linux (Debian 9.0 x86-64, Ubuntu 16.04 x86-64, Fedora 25 x86-64) (stable)
    • macOS (Sierra 10.11 x86-64) (stable)
    • FreeBSD (11 x86-64) (alpha)

Getting Started

Building riscv-gnu-toolchain

$ sudo apt-get install autoconf automake autotools-dev curl libmpc-dev libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc zlib1g-dev
$ git clone https://github.com/riscv/riscv-gnu-toolchain.git
$ cd riscv-gnu-toolchain
$ git submodule update --init --recursive
$ ./configure --prefix=/opt/riscv/toolchain
$ make

Building rv8

$ export RISCV=/opt/riscv/toolchain
$ git clone https://github.com/rv8-io/rv8.git
$ cd rv8
$ git submodule update --init --recursive
$ make
$ sudo make install

Running rv8

$ make test-build
$ rv-jit build/riscv64-unknown-elf/bin/test-dhrystone

Build Dependencies

  • gmake
  • gcc-5.4 or clang-3.4 (Linux minimum)
  • gcc-6.3 or clang-3.8 (Linux recommended)
  • RISC-V GNU Toolchain
  • RISCV environment variable

Ubuntu 14.04LTS Dependencies

The compiler in Ubuntu 14.04LTS doesn't support C++14. These instructions will install g++6 from the ubuntu toolchain repository and build the project using g++6.

sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
sudo apt-get update
sudo apt-get install g++-6
make CXX=g++-6 CC=gcc-6

Screenshots

ASCII map screenshot

Example ASCII map output from make map

Histogram screenshot

Example Instructions Histogram from

rv-bin histogram

Histogram screenshot

Example Registers Histogram from

rv-bin histogram

RISC-V disassembly screenshot

Example Disassembly output from

rv-bin dump

See RISC-V Instruction Set Listing and RISC-V Instruction Types for sample LaTeX output.

Useful Commands

Command

Description

make map
| print a colour opcode map
make latex
| output a LaTeX opcode tex
make pdf
| output a LaTeX opcode pdf
make test-spike
| run the ABI Proxy Simulator tests with
spike
make test-sim
| run the ABI Proxy Simulator tests with
rv-sim
make qemu-tests
| run the QEMU tests with
rv-sim
make test-sys
| run the Privileged System Emulator tests with
rv-sys
make linux
| bootstrap bbl, linux kernel and busybox image
sudo make install
| install to
/usr/local/bin

Notes

  • The
    linux
    target requires the RISC-V GNU Linux Toolchain
  • The
    test-build
    target requires the RISC-V ELF Toolchain
  • The
    qemu-tests
    target requires the
    third_party/qemu-tests
    to be built

Project Structure

Directories

| Directory | Description | :----------- | :--------------- |

meta
| Instruction set metadata |
src/abi
| Application binary interface |
src/app
| Test programs and utilities |
src/asm
| Assembler metadata library |
src/elf
| ELF parser library |
src/emu
| ISA simulator and emulator headers |
src/mem
| Memory allocator library |
src/model
| ISA metamodel library |
src/rom
| Boot ROM generator |
src/test
| ISA simulator and emulator tests |
src/util
| Miscellaneous utilities library |
doc/pdf
| Generated documentation

Libraries

The following table shows the RISC-V Meta libraries:

| Name | Description | Scale | :------------------ | :-------------------------------------- | :---- |

libriscv_asm.a
| ISA metadata and disassembly formatting | micro |
libriscv_elf.a
| ELF parser | micro |
libriscv_gen.a
| Source and documentation generators | macro |
libriscv_model.a
| Instruction set metamodel | macro |
libriscv_util.a
| Utility functions for tools | mini

Program Options

RISC-V x86-64 Simulator

RISC-V x86-64 JIT Simulator command line options:

$ rv-jit -h
usage: rv-jit [] [--]  []
            --log-instructions, -l            Log Instructions
                --log-operands, -o            Log Instructions and Operands
                 --symbolicate, -S            Symbolicate addresses in instruction log
              --log-memory-map, -m            Log Memory Map Information
                --log-syscalls, -c            Log System Calls
               --log-registers, -r            Log Registers (defaults to integer registers)
               --log-jit-trace, -T            Log JIT trace
            --log-jit-regalloc, -T            Log JIT register allocation
              --log-exit-stats, -E            Log Registers and Statistics at Exit
             --save-exit-stats, -D    Save Registers and Statistics at Exit
          --pc-usage-histogram, -P            Record program counter usage
    --register-usage-histogram, -R            Record register usage
 --instruction-usage-histogram, -I            Record instruction usage
                       --debug, -d            Start up in debugger CLI
                   --no-pseudo, -x            Disable Pseudoinstruction decoding
                   --no-fusion, -N            Disable JIT macro-op fusion
     --memory-mapped-registers, -M            Disable JIT host register mapping
              --update-instret, -i            Update instret in JIT code
                    --no-trace, -t            Disable JIT tracer
                       --audit, -a            Enable JIT audit
                 --trace-iters, -I    Trace iterations
                        --seed, -s    Random seed
                        --help, -h            Show help

Notes

  • Currently only the Linux syscall ABI proxy is implemented for the JIT simulator

RISC-V Proxy Simulator

The ABI Proxy Simulator command line options:

$ rv-sim -h
usage: rv-sim [] [--]  []
            --log-instructions, -l            Log Instructions
                --log-operands, -o            Log Instructions and Operands
                 --symbolicate, -S            Symbolicate addresses in instruction log
              --log-memory-map, -m            Log Memory Map Information
                --log-syscalls, -c            Log System Calls
               --log-registers, -r            Log Registers (defaults to integer registers)
              --log-exit-stats, -E            Log Registers and Statistics at Exit
             --save-exit-stats, -D    Save Registers and Statistics at Exit
          --pc-usage-histogram, -P            Record program counter usage
    --register-usage-histogram, -R            Record register usage
 --instruction-usage-histogram, -I            Record instruction usage
                       --debug, -d            Start up in debugger CLI
                   --no-pseudo, -x            Disable Pseudoinstruction decoding
                        --seed, -s    Random seed
                        --help, -h            Show help

To run the simple Hello World program (Proxy Mode):

rv-sim build/riscv64-unknown-elf/bin/hello-world-libc

RISC-V Full System Emulator

The Privilged ISA Full System Emulator command line options:

$ rv-sys -h
usage: rv-sys [] 
            --log-instructions, -l            Log Instructions
                --log-operands, -o            Log Instructions and Operands
                    --log-mmio, -O            Log Memory Mapped IO
              --log-memory-map, -m            Log Memory Map Information
               --log-mmode-csr, -M            Log Machine Control and Status Registers
               --log-smode-csr, -S            Log Supervisor Control and Status Registers
               --log-registers, -r            Log Registers (defaults to integer registers)
               --log-pagewalks, -v            Log Pagewalks
                  --log-config, -c            Log Config
                   --log-traps, -t            Log Traps
              --log-exit-stats, -E            Log Registers and Statistics at Exit
             --save-exit-stats, -D    Save Registers and Statistics at Exit
          --pc-usage-histogram, -P            Record program counter usage
    --register-usage-histogram, -R            Record register usage
 --instruction-usage-histogram, -I            Record instruction usage
                       --debug, -d            Start up in debugger
                  --debug-trap, -T            Start up in debugger and enter debugger on trap
                   --no-pseudo, -x            Disable Pseudoinstruction decoding
                --map-physical, -p    Map execuatable at physical address
                      --binary, -b    Boot Binary ( 32, 64 )
                        --seed, -s    Random seed
                        --help, -h            Show help

To run the privilged UART echo program (Privileged Mode):

rv-sys build/riscv64-unknown-elf/bin/test-m-mmio-uart

RISC-V ELF Dump Utility

ELF Dump usage command line options:

$ rv-bin dump -h
usage: dump [] 
                       --color, -c            Enable Color
            --print-elf-header, -e            Print ELF header
        --print-elf-header-ext, -x            Print ELF header (extended)
       --print-section-headers, -s            Print Section headers
       --print-program-headers, -p            Print Program headers
          --print-symbol-table, -t            Print Symbol Table
           --print-relocations, -r            Print Relocations
           --print-disassembly, -d            Print Disassembly
                      --pseudo, -P            Decode Pseudoinstructions
               --print-headers, -h            Print All Headers
                   --print-all, -a            Print All Headers and Disassembly
                        --help, -h            Show help

To run the ELF parser and disassembler:

rv-bin dump -c -a build/riscv64-unknown-elf/bin/hello-world-pcrel

Notes

  • The ELF dissassembler output requires 125 column terminal window

RISC-V ELF Histogram Utility

The ELF Histogram Utility usage command line options:

$ rv-bin histogram -h
usage: histogram [] 
                        --help, -h            Show help
                        --char, -c    Character to use in bars
                        --bars, -b            Print bars next to counts
                --instructions, -I            Instruction Usage Histogram
                   --registers, -R            Register Usage Histogram
          --registers-operands, -P            Register Usage Histogram (with operand positions)
                   --max-chars, -m    Maximum number of characters for bars
                --reverse-sort, -r            Sort in Reverse

To print the top 20 instructions in a RISC-V ELF binary:

rv-bin histogram -I -b -c █ linux/vmlinux | head -20

To print the top 20 registers in a RISC-V ELF binary:

rv-bin histogram -R -b -c █ linux/vmlinux | head -20

RISC-V Metadata Utility

The RV source and documentation generator usage command line options:

$ rv-meta -h
usage: rv-meta []
                        --help, -h            Show help
                  --isa-subset, -I    ISA subset (e.g. RV32IMA, RV32G, RV32GSC, RV64IMA, RV64G, RV64GSC)
                    --read-isa, -r    Read instruction set metadata from directory
                  --no-comment, -N            Don't emit comments in generated source
           --numeric-constants, -0            Use numeric constants in generated source
         --print-constraints-h, -XC           Print constraints header
            --print-fpu-test-h, -FH           Print FPU test header
            --print-fpu-test-c, -FC           Print FPU test source
              --print-interp-h, -V            Print interpreter header
                 --print-jit-h, -J            Print jit header
                --print-jit-cc, -K            Print jit source
   --substitute-question-marks, -?            Substitute question marks for zeros in LaTeX output
                 --print-latex, -l            Print LaTeX instruction listing
                       --color, -c            Enable ANSI color map
                   --print-map, -m            Print instruction map
      --print-map-pseudocode-c, -mc           Print instruction map with C pseudocode
    --print-map-pseudocode-alt, -ma           Print instruction map with alternate pseudocode
              --print-markdown, -md           Print instruction reference in markdown
                --print-meta-h, -H            Print metadata header
               --print-meta-cc, -C            Print metadata source
            --print-operands-h, -A            Print operands header
             --print-strings-h, -SH           Print strings header
            --print-strings-cc, -SC           Print strings source
              --print-switch-h, -S            Print switch header

To print a colour opcode map for the RV32IMA ISA subset:

rv-meta -I RV32IMA -m -c -r meta

To print a colour opcode map for the RV64IMAFDS ISA subset:

rv-meta -I RV64IMAFDS -m -c -r meta

To output LaTeX for the RV32C ISA subset:

rv-meta -I RV32C -l -r meta

To output LaTeX for the RV64G ISA subset:

rv-meta -I RV64G -l -r meta

References

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