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 (i386) 134 135 * ``qemu-i386`` TODO. 136 * ``qemu-x86_64`` TODO. 137 138- user mode (Microblaze) 139 140 * ``qemu-microblaze`` TODO. 141 142- user mode (MIPS) 143 144 * ``qemu-mips`` executes 32-bit big endian MIPS binaries (MIPS O32 ABI). 145 146 * ``qemu-mipsel`` executes 32-bit little endian MIPS binaries (MIPS O32 ABI). 147 148 * ``qemu-mips64`` executes 64-bit big endian MIPS binaries (MIPS N64 ABI). 149 150 * ``qemu-mips64el`` executes 64-bit little endian MIPS binaries (MIPS N64 151 ABI). 152 153 * ``qemu-mipsn32`` executes 32-bit big endian MIPS binaries (MIPS N32 ABI). 154 155 * ``qemu-mipsn32el`` executes 32-bit little endian MIPS binaries (MIPS N32 156 ABI). 157 158- user mode (PowerPC) 159 160 * ``qemu-ppc64`` TODO. 161 * ``qemu-ppc`` TODO. 162 163- user mode (SH4) 164 165 * ``qemu-sh4eb`` TODO. 166 * ``qemu-sh4`` TODO. 167 168- user mode (SPARC) 169 170 * ``qemu-sparc`` can execute Sparc32 binaries (Sparc32 CPU, 32 bit ABI). 171 172 * ``qemu-sparc32plus`` can execute Sparc32 and SPARC32PLUS binaries 173 (Sparc64 CPU, 32 bit ABI). 174 175 * ``qemu-sparc64`` can execute some Sparc64 (Sparc64 CPU, 64 bit ABI) and 176 SPARC32PLUS binaries (Sparc64 CPU, 32 bit ABI). 177 178BSD User space emulator 179----------------------- 180 181BSD Status 182~~~~~~~~~~ 183 184- target Sparc64 on Sparc64: Some trivial programs work. 185 186Quick Start 187~~~~~~~~~~~ 188 189In order to launch a BSD process, QEMU needs the process executable 190itself and all the target dynamic libraries used by it. 191 192- On Sparc64, you can just try to launch any process by using the 193 native libraries:: 194 195 qemu-sparc64 /bin/ls 196 197Command line options 198~~~~~~~~~~~~~~~~~~~~ 199 200:: 201 202 qemu-sparc64 [-h] [-d] [-L path] [-s size] [-bsd type] program [arguments...] 203 204``-h`` 205 Print the help 206 207``-L path`` 208 Set the library root path (default=/) 209 210``-s size`` 211 Set the stack size in bytes (default=524288) 212 213``-ignore-environment`` 214 Start with an empty environment. Without this option, the initial 215 environment is a copy of the caller's environment. 216 217``-E var=value`` 218 Set environment var to value. 219 220``-U var`` 221 Remove var from the environment. 222 223``-bsd type`` 224 Set the type of the emulated BSD Operating system. Valid values are 225 FreeBSD, NetBSD and OpenBSD (default). 226 227Debug options: 228 229``-d item1,...`` 230 Activate logging of the specified items (use '-d help' for a list of 231 log items) 232 233``-p pagesize`` 234 Act as if the host page size was 'pagesize' bytes 235 236``-one-insn-per-tb`` 237 Run the emulation with one guest instruction per translation block. 238 This slows down emulation a lot, but can be useful in some situations, 239 such as when trying to analyse the logs produced by the ``-d`` option. 240