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``-p pagesize`` 91 Act as if the host page size was 'pagesize' bytes 92 93``-g port`` 94 Wait gdb connection to port 95 96``-one-insn-per-tb`` 97 Run the emulation with one guest instruction per translation block. 98 This slows down emulation a lot, but can be useful in some situations, 99 such as when trying to analyse the logs produced by the ``-d`` option. 100 101Environment variables: 102 103QEMU_STRACE 104 Print system calls and arguments similar to the 'strace' program 105 (NOTE: the actual 'strace' program will not work because the user 106 space emulator hasn't implemented ptrace). At the moment this is 107 incomplete. All system calls that don't have a specific argument 108 format are printed with information for six arguments. Many 109 flag-style arguments don't have decoders and will show up as numbers. 110 111Other binaries 112~~~~~~~~~~~~~~ 113 114- user mode (Alpha) 115 116 * ``qemu-alpha`` TODO. 117 118- user mode (Arm) 119 120 * ``qemu-armeb`` TODO. 121 122 * ``qemu-arm`` is also capable of running Arm \"Angel\" semihosted ELF 123 binaries (as implemented by the arm-elf and arm-eabi Newlib/GDB 124 configurations), and arm-uclinux bFLT format binaries. 125 126- user mode (ColdFire) 127 128- user mode (M68K) 129 130 * ``qemu-m68k`` is capable of running semihosted binaries using the BDM 131 (m5xxx-ram-hosted.ld) or m68k-sim (sim.ld) syscall interfaces, and 132 coldfire uClinux bFLT format binaries. 133 134 The binary format is detected automatically. 135 136- user mode (Cris) 137 138 * ``qemu-cris`` TODO. 139 140- user mode (i386) 141 142 * ``qemu-i386`` TODO. 143 * ``qemu-x86_64`` TODO. 144 145- user mode (Microblaze) 146 147 * ``qemu-microblaze`` TODO. 148 149- user mode (MIPS) 150 151 * ``qemu-mips`` executes 32-bit big endian MIPS binaries (MIPS O32 ABI). 152 153 * ``qemu-mipsel`` executes 32-bit little endian MIPS binaries (MIPS O32 ABI). 154 155 * ``qemu-mips64`` executes 64-bit big endian MIPS binaries (MIPS N64 ABI). 156 157 * ``qemu-mips64el`` executes 64-bit little endian MIPS binaries (MIPS N64 158 ABI). 159 160 * ``qemu-mipsn32`` executes 32-bit big endian MIPS binaries (MIPS N32 ABI). 161 162 * ``qemu-mipsn32el`` executes 32-bit little endian MIPS binaries (MIPS N32 163 ABI). 164 165- user mode (NiosII) 166 167 * ``qemu-nios2`` TODO. 168 169- user mode (PowerPC) 170 171 * ``qemu-ppc64`` TODO. 172 * ``qemu-ppc`` TODO. 173 174- user mode (SH4) 175 176 * ``qemu-sh4eb`` TODO. 177 * ``qemu-sh4`` TODO. 178 179- user mode (SPARC) 180 181 * ``qemu-sparc`` can execute Sparc32 binaries (Sparc32 CPU, 32 bit ABI). 182 183 * ``qemu-sparc32plus`` can execute Sparc32 and SPARC32PLUS binaries 184 (Sparc64 CPU, 32 bit ABI). 185 186 * ``qemu-sparc64`` can execute some Sparc64 (Sparc64 CPU, 64 bit ABI) and 187 SPARC32PLUS binaries (Sparc64 CPU, 32 bit ABI). 188 189BSD User space emulator 190----------------------- 191 192BSD Status 193~~~~~~~~~~ 194 195- target Sparc64 on Sparc64: Some trivial programs work. 196 197Quick Start 198~~~~~~~~~~~ 199 200In order to launch a BSD process, QEMU needs the process executable 201itself and all the target dynamic libraries used by it. 202 203- On Sparc64, you can just try to launch any process by using the 204 native libraries:: 205 206 qemu-sparc64 /bin/ls 207 208Command line options 209~~~~~~~~~~~~~~~~~~~~ 210 211:: 212 213 qemu-sparc64 [-h] [-d] [-L path] [-s size] [-bsd type] program [arguments...] 214 215``-h`` 216 Print the help 217 218``-L path`` 219 Set the library root path (default=/) 220 221``-s size`` 222 Set the stack size in bytes (default=524288) 223 224``-ignore-environment`` 225 Start with an empty environment. Without this option, the initial 226 environment is a copy of the caller's environment. 227 228``-E var=value`` 229 Set environment var to value. 230 231``-U var`` 232 Remove var from the environment. 233 234``-bsd type`` 235 Set the type of the emulated BSD Operating system. Valid values are 236 FreeBSD, NetBSD and OpenBSD (default). 237 238Debug options: 239 240``-d item1,...`` 241 Activate logging of the specified items (use '-d help' for a list of 242 log items) 243 244``-p pagesize`` 245 Act as if the host page size was 'pagesize' bytes 246 247``-one-insn-per-tb`` 248 Run the emulation with one guest instruction per translation block. 249 This slows down emulation a lot, but can be useful in some situations, 250 such as when trying to analyse the logs produced by the ``-d`` option. 251