From 091479301f96d0e1df0ab12f18d1b265979cba47 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Fri, 28 Feb 2020 15:35:47 +0000 Subject: qemu-doc: convert user-mode emulation to a separate Sphinx manual MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The final addition to the set of QEMU manuals is the user-mode emulation manual, which right now is included in qemu-doc.texi. Extract it and convert it to rST, so that qemu-doc.texi covers only full system emulation. Signed-off-by: Paolo Bonzini Reviewed-by: Peter Maydell Reviewed-by: Alex Bennée Tested-by: Alex Bennée Signed-off-by: Peter Maydell Message-id: 20200228153619.9906-2-peter.maydell@linaro.org Message-id: 20200226113034.6741-2-pbonzini@redhat.com [PMM: Fix makefile conflicts; add user manual to index.rst and index.html.in; don't specify empty man_pages list; fixed a few comments to say 'user' rather than 'system'] Reviewed-by: Peter Maydell Signed-off-by: Peter Maydell --- docs/index.html.in | 1 + docs/index.rst | 1 + docs/user/conf.py | 15 +++ docs/user/index.rst | 16 +++ docs/user/main.rst | 295 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 328 insertions(+) create mode 100644 docs/user/conf.py create mode 100644 docs/user/index.rst create mode 100644 docs/user/main.rst (limited to 'docs') diff --git a/docs/index.html.in b/docs/index.html.in index cf61b1c..a576ace 100644 --- a/docs/index.html.in +++ b/docs/index.html.in @@ -14,6 +14,7 @@
  • System Emulation Guest Hardware Specifications
  • System Emulation User's Guide
  • Tools Guide
    • +
  • User Mode Emulation User's Guide
    • diff --git a/docs/index.rst b/docs/index.rst index acd604f..376dab2 100644 --- a/docs/index.rst +++ b/docs/index.rst @@ -15,3 +15,4 @@ Welcome to QEMU's documentation! specs/index system/index tools/index + user/index diff --git a/docs/user/conf.py b/docs/user/conf.py new file mode 100644 index 0000000..4b09aed --- /dev/null +++ b/docs/user/conf.py @@ -0,0 +1,15 @@ +# -*- coding: utf-8 -*- +# +# QEMU documentation build configuration file for the 'user' manual. +# +# This includes the top level conf file and then makes any necessary tweaks. +import sys +import os + +qemu_docdir = os.path.abspath("..") +parent_config = os.path.join(qemu_docdir, "conf.py") +exec(compile(open(parent_config, "rb").read(), parent_config, 'exec')) + +# This slightly misuses the 'description', but is the best way to get +# the manual title to appear in the sidebar. +html_theme_options['description'] = u'User Mode Emulation User''s Guide' diff --git a/docs/user/index.rst b/docs/user/index.rst new file mode 100644 index 0000000..e030dad --- /dev/null +++ b/docs/user/index.rst @@ -0,0 +1,16 @@ +.. This is the top level page for the 'user' manual. + + +QEMU User Mode Emulation User's Guide +===================================== + +This manual is the overall guide for users using QEMU +for user-mode emulation. In this mode, QEMU can launch +processes compiled for one CPU on another CPU. + +Contents: + +.. toctree:: + :maxdepth: 2 + + main diff --git a/docs/user/main.rst b/docs/user/main.rst new file mode 100644 index 0000000..ca69f77 --- /dev/null +++ b/docs/user/main.rst @@ -0,0 +1,295 @@ +QEMU User space emulator +======================== + +Supported Operating Systems +--------------------------- + +The following OS are supported in user space emulation: + +- Linux (referred as qemu-linux-user) + +- BSD (referred as qemu-bsd-user) + +Features +-------- + +QEMU user space emulation has the following notable features: + +**System call translation:** + QEMU includes a generic system call translator. This means that the + parameters of the system calls can be converted to fix endianness and + 32/64-bit mismatches between hosts and targets. IOCTLs can be + converted too. + +**POSIX signal handling:** + QEMU can redirect to the running program all signals coming from the + host (such as ``SIGALRM``), as well as synthesize signals from + virtual CPU exceptions (for example ``SIGFPE`` when the program + executes a division by zero). + + QEMU relies on the host kernel to emulate most signal system calls, + for example to emulate the signal mask. On Linux, QEMU supports both + normal and real-time signals. + +**Threading:** + On Linux, QEMU can emulate the ``clone`` syscall and create a real + host thread (with a separate virtual CPU) for each emulated thread. + Note that not all targets currently emulate atomic operations + correctly. x86 and ARM use a global lock in order to preserve their + semantics. + +QEMU was conceived so that ultimately it can emulate itself. Although it +is not very useful, it is an important test to show the power of the +emulator. + +Linux User space emulator +------------------------- + +Quick Start +~~~~~~~~~~~ + +In order to launch a Linux process, QEMU needs the process executable +itself and all the target (x86) dynamic libraries used by it. + +- On x86, you can just try to launch any process by using the native + libraries:: + + qemu-i386 -L / /bin/ls + + ``-L /`` tells that the x86 dynamic linker must be searched with a + ``/`` prefix. + +- Since QEMU is also a linux process, you can launch QEMU with QEMU + (NOTE: you can only do that if you compiled QEMU from the sources):: + + qemu-i386 -L / qemu-i386 -L / /bin/ls + +- On non x86 CPUs, you need first to download at least an x86 glibc + (``qemu-runtime-i386-XXX-.tar.gz`` on the QEMU web page). Ensure that + ``LD_LIBRARY_PATH`` is not set:: + + unset LD_LIBRARY_PATH + + Then you can launch the precompiled ``ls`` x86 executable:: + + qemu-i386 tests/i386/ls + + You can look at ``scripts/qemu-binfmt-conf.sh`` so that QEMU is + automatically launched by the Linux kernel when you try to launch x86 + executables. It requires the ``binfmt_misc`` module in the Linux + kernel. + +- The x86 version of QEMU is also included. You can try weird things + such as:: + + qemu-i386 /usr/local/qemu-i386/bin/qemu-i386 \ + /usr/local/qemu-i386/bin/ls-i386 + +Wine launch +~~~~~~~~~~~ + +- Ensure that you have a working QEMU with the x86 glibc distribution + (see previous section). In order to verify it, you must be able to + do:: + + qemu-i386 /usr/local/qemu-i386/bin/ls-i386 + +- Download the binary x86 Wine install (``qemu-XXX-i386-wine.tar.gz`` + on the QEMU web page). + +- Configure Wine on your account. Look at the provided script + ``/usr/local/qemu-i386/bin/wine-conf.sh``. Your previous + ``${HOME}/.wine`` directory is saved to ``${HOME}/.wine.org``. + +- Then you can try the example ``putty.exe``:: + + qemu-i386 /usr/local/qemu-i386/wine/bin/wine \ + /usr/local/qemu-i386/wine/c/Program\ Files/putty.exe + +Command line options +~~~~~~~~~~~~~~~~~~~~ + +:: + + qemu-i386 [-h] [-d] [-L path] [-s size] [-cpu model] [-g port] [-B offset] [-R size] program [arguments...] + +``-h`` + Print the help + +``-L path`` + Set the x86 elf interpreter prefix (default=/usr/local/qemu-i386) + +``-s size`` + Set the x86 stack size in bytes (default=524288) + +``-cpu model`` + Select CPU model (-cpu help for list and additional feature + selection) + +``-E var=value`` + Set environment var to value. + +``-U var`` + Remove var from the environment. + +``-B offset`` + Offset guest address by the specified number of bytes. This is useful + when the address region required by guest applications is reserved on + the host. This option is currently only supported on some hosts. + +``-R size`` + Pre-allocate a guest virtual address space of the given size (in + bytes). \"G\", \"M\", and \"k\" suffixes may be used when specifying + the size. + +Debug options: + +``-d item1,...`` + Activate logging of the specified items (use '-d help' for a list of + log items) + +``-p pagesize`` + Act as if the host page size was 'pagesize' bytes + +``-g port`` + Wait gdb connection to port + +``-singlestep`` + Run the emulation in single step mode. + +Environment variables: + +QEMU_STRACE + Print system calls and arguments similar to the 'strace' program + (NOTE: the actual 'strace' program will not work because the user + space emulator hasn't implemented ptrace). At the moment this is + incomplete. All system calls that don't have a specific argument + format are printed with information for six arguments. Many + flag-style arguments don't have decoders and will show up as numbers. + +Other binaries +~~~~~~~~~~~~~~ + +user mode (Alpha) +``qemu-alpha`` TODO. + +user mode (ARM) +``qemu-armeb`` TODO. + +user mode (ARM) +``qemu-arm`` is also capable of running ARM \"Angel\" semihosted ELF +binaries (as implemented by the arm-elf and arm-eabi Newlib/GDB +configurations), and arm-uclinux bFLT format binaries. + +user mode (ColdFire) +user mode (M68K) +``qemu-m68k`` is capable of running semihosted binaries using the BDM +(m5xxx-ram-hosted.ld) or m68k-sim (sim.ld) syscall interfaces, and +coldfire uClinux bFLT format binaries. + +The binary format is detected automatically. + +user mode (Cris) +``qemu-cris`` TODO. + +user mode (i386) +``qemu-i386`` TODO. ``qemu-x86_64`` TODO. + +user mode (Microblaze) +``qemu-microblaze`` TODO. + +user mode (MIPS) +``qemu-mips`` executes 32-bit big endian MIPS binaries (MIPS O32 ABI). + +``qemu-mipsel`` executes 32-bit little endian MIPS binaries (MIPS O32 +ABI). + +``qemu-mips64`` executes 64-bit big endian MIPS binaries (MIPS N64 ABI). + +``qemu-mips64el`` executes 64-bit little endian MIPS binaries (MIPS N64 +ABI). + +``qemu-mipsn32`` executes 32-bit big endian MIPS binaries (MIPS N32 +ABI). + +``qemu-mipsn32el`` executes 32-bit little endian MIPS binaries (MIPS N32 +ABI). + +user mode (NiosII) +``qemu-nios2`` TODO. + +user mode (PowerPC) +``qemu-ppc64abi32`` TODO. ``qemu-ppc64`` TODO. ``qemu-ppc`` TODO. + +user mode (SH4) +``qemu-sh4eb`` TODO. ``qemu-sh4`` TODO. + +user mode (SPARC) +``qemu-sparc`` can execute Sparc32 binaries (Sparc32 CPU, 32 bit ABI). + +``qemu-sparc32plus`` can execute Sparc32 and SPARC32PLUS binaries +(Sparc64 CPU, 32 bit ABI). + +``qemu-sparc64`` can execute some Sparc64 (Sparc64 CPU, 64 bit ABI) and +SPARC32PLUS binaries (Sparc64 CPU, 32 bit ABI). + +BSD User space emulator +----------------------- + +BSD Status +~~~~~~~~~~ + +- target Sparc64 on Sparc64: Some trivial programs work. + +Quick Start +~~~~~~~~~~~ + +In order to launch a BSD process, QEMU needs the process executable +itself and all the target dynamic libraries used by it. + +- On Sparc64, you can just try to launch any process by using the + native libraries:: + + qemu-sparc64 /bin/ls + +Command line options +~~~~~~~~~~~~~~~~~~~~ + +:: + + qemu-sparc64 [-h] [-d] [-L path] [-s size] [-bsd type] program [arguments...] + +``-h`` + Print the help + +``-L path`` + Set the library root path (default=/) + +``-s size`` + Set the stack size in bytes (default=524288) + +``-ignore-environment`` + Start with an empty environment. Without this option, the initial + environment is a copy of the caller's environment. + +``-E var=value`` + Set environment var to value. + +``-U var`` + Remove var from the environment. + +``-bsd type`` + Set the type of the emulated BSD Operating system. Valid values are + FreeBSD, NetBSD and OpenBSD (default). + +Debug options: + +``-d item1,...`` + Activate logging of the specified items (use '-d help' for a list of + log items) + +``-p pagesize`` + Act as if the host page size was 'pagesize' bytes + +``-singlestep`` + Run the emulation in single step mode. -- cgit v1.1