1QEMU User space emulator 2======================== 3 4Supported Operating Systems 5--------------------------- 6 7The following OS are supported in user space emulation: 8 9- Linux (referred as qemu-linux-user) 10 11- BSD (referred as qemu-bsd-user) 12 13Features 14-------- 15 16QEMU user space emulation has the following notable features: 17 18**System call translation:** 19 QEMU includes a generic system call translator. This means that the 20 parameters of the system calls can be converted to fix endianness and 21 32/64-bit mismatches between hosts and targets. IOCTLs can be 22 converted too. 23 24**POSIX signal handling:** 25 QEMU can redirect to the running program all signals coming from the 26 host (such as ``SIGALRM``), as well as synthesize signals from 27 virtual CPU exceptions (for example ``SIGFPE`` when the program 28 executes a division by zero). 29 30 QEMU relies on the host kernel to emulate most signal system calls, 31 for example to emulate the signal mask. On Linux, QEMU supports both 32 normal and real-time signals. 33 34**Threading:** 35 On Linux, QEMU can emulate the ``clone`` syscall and create a real 36 host thread (with a separate virtual CPU) for each emulated thread. 37 Note that not all targets currently emulate atomic operations 38 correctly. x86 and Arm use a global lock in order to preserve their 39 semantics. 40 41QEMU was conceived so that ultimately it can emulate itself. Although it 42is not very useful, it is an important test to show the power of the 43emulator. 44 45Linux User space emulator 46------------------------- 47 48Command line options 49~~~~~~~~~~~~~~~~~~~~ 50 51:: 52 53 qemu-i386 [-h] [-d] [-L path] [-s size] [-cpu model] [-g port] [-B offset] [-R size] program [arguments...] 54 55``-h`` 56 Print the help 57 58``-L path`` 59 Set the x86 elf interpreter prefix (default=/usr/local/qemu-i386) 60 61``-s size`` 62 Set the x86 stack size in bytes (default=524288) 63 64``-cpu model`` 65 Select CPU model (-cpu help for list and additional feature 66 selection) 67 68``-E var=value`` 69 Set environment var to value. 70 71``-U var`` 72 Remove var from the environment. 73 74``-B offset`` 75 Offset guest address by the specified number of bytes. This is useful 76 when the address region required by guest applications is reserved on 77 the host. This option is currently only supported on some hosts. 78 79``-R size`` 80 Pre-allocate a guest virtual address space of the given size (in 81 bytes). \"G\", \"M\", and \"k\" suffixes may be used when specifying 82 the size. 83 84Debug options: 85 86``-d item1,...`` 87 Activate logging of the specified items (use '-d help' for a list of 88 log items) 89 90``-g port`` 91 Wait gdb connection to port 92 93``-one-insn-per-tb`` 94 Run the emulation with one guest instruction per translation block. 95 This slows down emulation a lot, but can be useful in some situations, 96 such as when trying to analyse the logs produced by the ``-d`` option. 97 98Environment variables: 99 100QEMU_STRACE 101 Print system calls and arguments similar to the 'strace' program 102 (NOTE: the actual 'strace' program will not work because the user 103 space emulator hasn't implemented ptrace). At the moment this is 104 incomplete. All system calls that don't have a specific argument 105 format are printed with information for six arguments. Many 106 flag-style arguments don't have decoders and will show up as numbers. 107 108Other binaries 109~~~~~~~~~~~~~~ 110 111- user mode (Alpha) 112 113 * ``qemu-alpha`` TODO. 114 115- user mode (Arm) 116 117 * ``qemu-armeb`` TODO. 118 119 * ``qemu-arm`` is also capable of running Arm \"Angel\" semihosted ELF 120 binaries (as implemented by the arm-elf and arm-eabi Newlib/GDB 121 configurations), and arm-uclinux bFLT format binaries. 122 123- user mode (ColdFire) 124 125- user mode (M68K) 126 127 * ``qemu-m68k`` is capable of running semihosted binaries using the BDM 128 (m5xxx-ram-hosted.ld) or m68k-sim (sim.ld) syscall interfaces, and 129 coldfire uClinux bFLT format binaries. 130 131 The binary format is detected automatically. 132 133- user mode (Cris) 134 135 * ``qemu-cris`` TODO. 136 137- user mode (i386) 138 139 * ``qemu-i386`` TODO. 140 * ``qemu-x86_64`` TODO. 141 142- user mode (Microblaze) 143 144 * ``qemu-microblaze`` TODO. 145 146- user mode (MIPS) 147 148 * ``qemu-mips`` executes 32-bit big endian MIPS binaries (MIPS O32 ABI). 149 150 * ``qemu-mipsel`` executes 32-bit little endian MIPS binaries (MIPS O32 ABI). 151 152 * ``qemu-mips64`` executes 64-bit big endian MIPS binaries (MIPS N64 ABI). 153 154 * ``qemu-mips64el`` executes 64-bit little endian MIPS binaries (MIPS N64 155 ABI). 156 157 * ``qemu-mipsn32`` executes 32-bit big endian MIPS binaries (MIPS N32 ABI). 158 159 * ``qemu-mipsn32el`` executes 32-bit little endian MIPS binaries (MIPS N32 160 ABI). 161 162- user mode (PowerPC) 163 164 * ``qemu-ppc64`` TODO. 165 * ``qemu-ppc`` TODO. 166 167- user mode (SH4) 168 169 * ``qemu-sh4eb`` TODO. 170 * ``qemu-sh4`` TODO. 171 172- user mode (SPARC) 173 174 * ``qemu-sparc`` can execute Sparc32 binaries (Sparc32 CPU, 32 bit ABI). 175 176 * ``qemu-sparc32plus`` can execute Sparc32 and SPARC32PLUS binaries 177 (Sparc64 CPU, 32 bit ABI). 178 179 * ``qemu-sparc64`` can execute some Sparc64 (Sparc64 CPU, 64 bit ABI) and 180 SPARC32PLUS binaries (Sparc64 CPU, 32 bit ABI). 181 182BSD User space emulator 183----------------------- 184 185BSD Status 186~~~~~~~~~~ 187 188- target Sparc64 on Sparc64: Some trivial programs work. 189 190Quick Start 191~~~~~~~~~~~ 192 193In order to launch a BSD process, QEMU needs the process executable 194itself and all the target dynamic libraries used by it. 195 196- On Sparc64, you can just try to launch any process by using the 197 native libraries:: 198 199 qemu-sparc64 /bin/ls 200 201Command line options 202~~~~~~~~~~~~~~~~~~~~ 203 204:: 205 206 qemu-sparc64 [-h] [-d] [-L path] [-s size] [-bsd type] program [arguments...] 207 208``-h`` 209 Print the help 210 211``-L path`` 212 Set the library root path (default=/) 213 214``-s size`` 215 Set the stack size in bytes (default=524288) 216 217``-ignore-environment`` 218 Start with an empty environment. Without this option, the initial 219 environment is a copy of the caller's environment. 220 221``-E var=value`` 222 Set environment var to value. 223 224``-U var`` 225 Remove var from the environment. 226 227``-bsd type`` 228 Set the type of the emulated BSD Operating system. Valid values are 229 FreeBSD, NetBSD and OpenBSD (default). 230 231Debug options: 232 233``-d item1,...`` 234 Activate logging of the specified items (use '-d help' for a list of 235 log items) 236 237``-p pagesize`` 238 Act as if the host page size was 'pagesize' bytes 239 240``-one-insn-per-tb`` 241 Run the emulation with one guest instruction per translation block. 242 This slows down emulation a lot, but can be useful in some situations, 243 such as when trying to analyse the logs produced by the ``-d`` option. 244