mirror of
https://github.com/genodelabs/genode.git
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299 lines
6.6 KiB
C++
299 lines
6.6 KiB
C++
/*
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* \brief VirtualBox runtime (RT)
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* \author Norman Feske
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* \date 2013-08-20
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*/
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/*
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* Copyright (C) 2013-2017 Genode Labs GmbH
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*
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* This file is distributed under the terms of the GNU General Public License
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* version 2.
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*/
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/* Genode includes */
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#include <base/log.h>
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#include <util/string.h>
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#include <rtc_session/connection.h>
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/* libc includes */
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#include <stdlib.h>
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#include <signal.h>
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#include <sys/mount.h> /* statfs */
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#include <sys/statvfs.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h> /* open */
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/* Genode specific Vbox include */
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#include "vmm.h"
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/* libc memory allocator */
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#include <libc_mem_alloc.h>
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/* VirtualBox includes */
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#include <iprt/mem.h>
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#include <iprt/assert.h>
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static const bool verbose = false;
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/*
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* We need an initial buffer currently, since the libc issues during
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* initialization malloc (dup) calls to the one defined below. At this
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* point we have not any env pointer.
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* Additionally static constructors are executed currently before the libc
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* is done with initialization and so we also have no Env pointer here.
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*/
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static char buffer[3 * 1024];
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static unsigned buffer_len = 0;
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static bool initial_memory(void * ptr)
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{
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return buffer <= ptr && ptr < buffer + sizeof(buffer);
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}
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/*
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* We cannot use the libc's version of malloc because it does not satisfies
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* the alignment constraints asserted by 'Runtime/r3/alloc.cpp'.
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*/
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static Libc::Mem_alloc_impl * memory()
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{
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try { genode_env(); } catch (...) { return nullptr; }
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static Libc::Mem_alloc_impl mem( genode_env().rm(), genode_env().ram());
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return &mem;
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}
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extern "C" void *malloc(::size_t size)
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{
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if (memory())
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return memory()->alloc(size, Genode::log2(RTMEM_ALIGNMENT));
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void * ret = buffer + buffer_len;
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buffer_len += (size + RTMEM_ALIGNMENT - 1) & ~(0ULL + RTMEM_ALIGNMENT - 1);
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if (buffer_len <= sizeof(buffer))
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return ret;
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struct Not_enough_initial_memory : Genode::Exception { };
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throw Not_enough_initial_memory();
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}
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extern "C" void *calloc(::size_t nmemb, ::size_t size)
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{
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void *ret = malloc(nmemb*size);
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if (ret)
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Genode::memset(ret, 0, nmemb*size);
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return ret;
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}
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extern "C" void free(void *ptr)
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{
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if (!initial_memory(ptr))
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memory()->free(ptr);
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}
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extern "C" void *realloc(void *ptr, ::size_t size)
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{
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if (!ptr)
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return malloc(size);
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if (!size) {
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free(ptr);
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return 0;
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}
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unsigned long old_size = size;
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if (!initial_memory(ptr)) {
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/* determine size of old block content (without header) */
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old_size = memory()->size_at(ptr);
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/* do not reallocate if new size is less than the current size */
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if (size <= old_size)
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return ptr;
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}
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/* allocate new block */
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void *new_addr = malloc(size);
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/* copy content from old block into new block */
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if (new_addr)
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Genode::memcpy(new_addr, ptr, Genode::min(old_size, (unsigned long)size));
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/* free old block */
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free(ptr);
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return new_addr;
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}
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extern "C" char *getenv(const char *name)
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{
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/*
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* Logging to the pseudo file '/log' is done via the libc plugin provided
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* by 'logging.cc'.
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*/
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if (Genode::strcmp(name, "VBOX_LOG_DEST") == 0 ||
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Genode::strcmp(name, "VBOX_RELEASE_LOG_DEST") == 0)
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return (char *)"file=log";
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if (Genode::strcmp(name, "VBOX_LOG") == 0 ||
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Genode::strcmp(name, "VBOX_RELEASE_LOG") == 0)
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return (char *)"+rem_disas.e.l.f"
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"+rem_printf.e.l.f"
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// "+rem_run.e.l.f"
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// "+pgm.e.l.f"
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// "+pdm"
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// "+cpum.e.l.f"
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// "+dev_pcnet.e.l.f"
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// "+dev_pic.e.l.f"
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// "+dev_apic.e.l.f"
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// "+usb_mouse.e.l.f"
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// "+main.e.l3.f"
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// "+shared_folders.e.l.f"
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// "+drv_host_serial.e.l.f"
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// "+dev_audio.e.l.f"
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// "+dev_hda.e"
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// "+drv_host_audio.e.l.f"
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// "+drv_audio.e.l.f"
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// "+dev_vmm_backdoor.e.l.f"
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// "+hgcm.e.l.f"
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// "+dev_vmm.e.l.f"
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;
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/*
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* see https://www.virtualbox.org/wiki/VBoxLogging for useful tips to
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* enable useful debugging of Guest additions in Windows/Linux together
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* with +dev_vmm_backdoor, hgcm and dev_vmm
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*/
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if (Genode::strcmp(name, "VBOX_LOG_FLAGS") == 0 ||
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Genode::strcmp(name, "VBOX_RELEASE_LOG_FLAGS") == 0)
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return (char *)"thread"; //" tsc";
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return 0;
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}
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extern "C" int sigaction(int signum, const struct sigaction *act,
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struct sigaction *oldact)
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{
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/*
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* Break infinite loop at 'VBox/Runtime/r3/init.cpp' :451
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*/
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if (oldact)
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oldact->sa_flags = SA_SIGINFO;
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return 0;
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}
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/* Some dummy implementation for LibC functions */
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extern "C" pid_t getpid(void)
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{
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if (verbose)
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Genode::log(__func__, " called - rip ", __builtin_return_address(0));
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return 1345;
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}
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extern "C" int sigprocmask(int how, const sigset_t *set, sigset_t *oldset)
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{
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if (verbose)
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Genode::log(__func__, " called - rip ", __builtin_return_address(0));
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return -1;
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}
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extern "C" int _sigaction(int, const struct sigaction *, struct sigaction *)
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{
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if (verbose)
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Genode::log(__func__, " called - rip ", __builtin_return_address(0));
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return -1;
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}
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extern "C" int futimes(int fd, const struct timeval tv[2])
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{
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Genode::log("%s called - rip %p", __func__, __builtin_return_address(0));
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return 0;
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}
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extern "C" int lutimes(const char *filename, const struct timeval tv[2])
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{
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Genode::log(__func__, ": called - file '", filename, "' - rip ",
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__builtin_return_address(0));
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return 0;
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}
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extern "C" int _sigprocmask()
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{
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if (verbose)
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Genode::log("%s called - rip %p", __func__, __builtin_return_address(0));
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return 0;
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}
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/**
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* Used by Shared Folders Guest additions
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*/
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extern "C" int statfs(const char *path, struct statfs *buf)
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{
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if (!buf) {
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errno = EFAULT;
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return -1;
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}
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int fd = open(path, 0);
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if (fd < 0)
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return fd;
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struct statvfs result;
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int res = fstatvfs(fd, &result);
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close(fd);
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if (res)
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return res;
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Genode::memset(buf, 0, sizeof(*buf));
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buf->f_bavail = result.f_bavail;
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buf->f_bfree = result.f_bfree;
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buf->f_blocks = result.f_blocks;
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buf->f_ffree = result.f_ffree;
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buf->f_files = result.f_files;
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buf->f_bsize = result.f_bsize;
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bool show_warning = !buf->f_bsize || !buf->f_blocks || !buf->f_bavail;
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if (!buf->f_bsize)
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buf->f_bsize = 4096;
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if (!buf->f_blocks)
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buf->f_blocks = 128 * 1024;
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if (!buf->f_bavail)
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buf->f_bavail = buf->f_blocks;
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if (show_warning)
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Genode::warning("statfs provides bogus values for '", path, "' (probably a shared folder)");
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return res;
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}
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extern "C" long pathconf(char const *path, int name)
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{
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if (name == _PC_NAME_MAX) return 255;
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Genode::error("pathconf does not support config option ", name);
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errno = EINVAL;
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return -1;
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}
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