/* $Id: alloc-solaris.cpp 5373 2007-10-18 11:38:45Z vboxsync $ */ /** @file * innotek Portable Runtime - Memory Allocation, POSIX. */ /* * Copyright (C) 2006-2007 innotek GmbH * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License as published by the Free Software Foundation, * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE * distribution. VirtualBox OSE is distributed in the hope that it will * be useful, but WITHOUT ANY WARRANTY of any kind. */ /******************************************************************************* * Header Files * *******************************************************************************/ #include #include #include #include #include #include #include #include #include #ifdef IN_RING3 /** * Allocates memory which may contain code. * * @returns Pointer to the allocated memory. * @returns NULL on failure. * @param cb Size in bytes of the memory block to allocate. */ RTDECL(void *) RTMemExecAlloc(size_t cb) { /* * Allocate first. */ AssertMsg(cb, ("Allocating ZERO bytes is really not a good idea! Good luck with the next assertion!\n")); cb = RT_ALIGN_Z(cb, PAGE_SIZE); void *pv = valloc(cb); AssertMsg(pv, ("posix_memalign(%d) failed!!! errno=%d\n", cb, errno)); if (RT_UNLIKELY((uintptr_t)pv + cb > _2G)) { AssertMsgFailed(("%p %#zx\n", pv, cb)); free(pv); return NULL; } if (pv) { /* * Add PROT_EXEC flag to the page(s). */ memset(pv, 0xcc, cb); int rc = mprotect(pv, cb, PROT_READ | PROT_WRITE | PROT_EXEC); if (rc) { AssertMsgFailed(("mprotect(%p, %#x,,) -> rc=%d, errno=%d\n", pv, cb, rc, errno)); free(pv); pv = NULL; } } return pv; } /** * Free executable/read/write memory allocated by RTMemExecAlloc(). * * @param pv Pointer to memory block. */ RTDECL(void) RTMemExecFree(void *pv) { if (pv) free(pv); } /** * Allocate page aligned memory. * * @returns Pointer to the allocated memory. * @returns NULL if we're out of memory. * @param cb Size of the memory block. Will be rounded up to page size. */ RTDECL(void *) RTMemPageAlloc(size_t cb) { return valloc(RT_ALIGN_Z(cb, PAGE_SIZE)); } /** * Allocate zero'ed page aligned memory. * * @returns Pointer to the allocated memory. * @returns NULL if we're out of memory. * @param cb Size of the memory block. Will be rounded up to page size. */ RTDECL(void *) RTMemPageAllocZ(size_t cb) { cb = RT_ALIGN_Z(cb, PAGE_SIZE); void *pv = valloc(cb); if (pv) bzero(pv, RT_ALIGN_Z(cb, PAGE_SIZE)); return pv; } /** * Free a memory block allocated with RTMemPageAlloc() or RTMemPageAllocZ(). * * @param pv Pointer to the block as it was returned by the allocation function. * NULL will be ignored. */ RTDECL(void) RTMemPageFree(void *pv) { if (pv) free(pv); } /** * Change the page level protection of a memory region. * * @returns iprt status code. * @param pv Start of the region. Will be rounded down to nearest page boundary. * @param cb Size of the region. Will be rounded up to the nearest page boundary. * @param fProtect The new protection, a combination of the RTMEM_PROT_* defines. */ RTDECL(int) RTMemProtect(void *pv, size_t cb, unsigned fProtect) { /* * Validate input. */ if (cb == 0) { AssertMsgFailed(("!cb\n")); return VERR_INVALID_PARAMETER; } if (fProtect & ~(RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC)) { AssertMsgFailed(("fProtect=%#x\n", fProtect)); return VERR_INVALID_PARAMETER; } /* * Convert the flags. */ int fProt; #if RTMEM_PROT_NONE == PROT_NONE \ && RTMEM_PROT_READ == PROT_READ \ && RTMEM_PROT_WRITE == PROT_WRITE \ && RTMEM_PROT_EXEC == PROT_EXEC fProt = fProtect; #else Assert(!RTMEM_PROT_NONE); if (!fProtect) fProt = PROT_NONE; else { fProt = 0; if (fProtect & RTMEM_PROT_READ) fProt |= PROT_READ; if (fProtect & RTMEM_PROT_WRITE) fProt |= PROT_WRITE; if (fProtect & RTMEM_PROT_EXEC) fProt |= PROT_EXEC; } #endif /* * Align the request. */ cb += (uintptr_t)pv & PAGE_OFFSET_MASK; pv = (void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK); /* * Change the page attributes. */ int rc = mprotect(pv, cb, fProt); if (!rc) return rc; return RTErrConvertFromErrno(errno); } #endif