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be742759b0
When using bit-wise operations that exploit the power-of-two nature of the second argument of ROUND_UP(), we still need to ensure that the mask is as wide as the first argument (done by using a ternary to force proper arithmetic promotion). Unpatched, ROUND_UP(2ULL*1024*1024*1024*1024, 512U) produces 0, instead of the intended 2TiB, because negation of an unsigned 32-bit quantity followed by widening to 64-bits does not sign-extend the mask. Broken since its introduction in commit 292c8e50 (v1.5.0). Callers that passed the same width type to both macro parameters, or that had other code to ensure the first parameter's maximum runtime value did not exceed the second parameter's width, are unaffected, but I did not audit to see which (if any) existing clients of the macro could trigger incorrect behavior (I found the bug while adding a new use of the macro). While preparing the patch, checkpatch complained about poor spacing, so I also fixed that here and in the nearby DIV_ROUND_UP. Backports commit 33a599667a9e70588483a31286dfff8cfc27d513 from qemu
236 lines
6.2 KiB
C
236 lines
6.2 KiB
C
/*
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* OS includes and handling of OS dependencies
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*
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* This header exists to pull in some common system headers that
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* most code in QEMU will want, and to fix up some possible issues with
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* it (missing defines, Windows weirdness, and so on).
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*
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* To avoid getting into possible circular include dependencies, this
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* file should not include any other QEMU headers, with the exceptions
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* of config-host.h, config-target.h, qemu/compiler.h,
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* sysemu/os-posix.h, sysemu/os-win32.h, glib-compat.h and
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* qemu/typedefs.h, all of which are doing a similar job to this file
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* and are under similar constraints.
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*
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* This header also contains prototypes for functions defined in
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* os-*.c and util/oslib-*.c; those would probably be better split
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* out into separate header files.
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*
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* In an ideal world this header would contain only:
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* (1) things which everybody needs
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* (2) things without which code would work on most platforms but
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* fail to compile or misbehave on a minority of host OSes
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef QEMU_OSDEP_H
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#define QEMU_OSDEP_H
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#include "config-host.h"
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#ifdef NEED_CPU_H
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#include "config-target.h"
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#endif
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#include "qemu/compiler.h"
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/* Older versions of C++ don't get definitions of various macros from
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* stdlib.h unless we define these macros before first inclusion of
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* that system header.
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*/
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#ifndef __STDC_CONSTANT_MACROS
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#define __STDC_CONSTANT_MACROS
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#endif
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#ifndef __STDC_LIMIT_MACROS
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#define __STDC_LIMIT_MACROS
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#endif
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#ifndef __STDC_FORMAT_MACROS
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#define __STDC_FORMAT_MACROS
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#endif
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#include <stdarg.h>
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#include <stddef.h>
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#include "unicorn/platform.h"
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#include <sys/types.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <strings.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <time.h>
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#include <ctype.h>
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <assert.h>
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/* setjmp must be declared before sysemu/os-win32.h
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* because it is redefined there. */
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#include <setjmp.h>
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#include <signal.h>
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#ifdef __OpenBSD__
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#include <sys/signal.h>
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#endif
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#ifndef _WIN32
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#include <sys/wait.h>
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#else
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#define WIFEXITED(x) 1
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#define WEXITSTATUS(x) (x)
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#endif
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#ifdef _WIN32
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#include "sysemu/os-win32.h"
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#endif
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#include "glib_compat.h"
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#include "qemu/typedefs.h"
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#ifndef O_LARGEFILE
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#define O_LARGEFILE 0
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#endif
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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#ifndef MAP_ANONYMOUS
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#define MAP_ANONYMOUS MAP_ANON
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#endif
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#ifndef ENOMEDIUM
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#define ENOMEDIUM ENODEV
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#endif
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#if !defined(ENOTSUP)
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#define ENOTSUP 4096
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#endif
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#if !defined(ECANCELED)
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#define ECANCELED 4097
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#endif
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#if !defined(EMEDIUMTYPE)
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#define EMEDIUMTYPE 4098
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#endif
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#ifndef TIME_MAX
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#define TIME_MAX LONG_MAX
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#endif
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/* HOST_LONG_BITS is the size of a native pointer in bits. */
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#if UINTPTR_MAX == UINT32_MAX
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# define HOST_LONG_BITS 32
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#elif UINTPTR_MAX == UINT64_MAX
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# define HOST_LONG_BITS 64
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#else
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# error Unknown pointer size
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#endif
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#ifndef MIN
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#define MIN(a, b) (((a) < (b)) ? (a) : (b))
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#endif
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#ifndef MAX
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#define MAX(a, b) (((a) > (b)) ? (a) : (b))
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#endif
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/* Minimum function that returns zero only iff both values are zero.
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* Intended for use with unsigned values only. */
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#ifndef MIN_NON_ZERO
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#define MIN_NON_ZERO(a, b) ((a) == 0 ? (b) : \
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((b) == 0 ? (a) : (MIN(a, b))))
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#endif
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/* Round number down to multiple */
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#define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m))
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/* Round number up to multiple. Safe when m is not a power of 2 (see
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* ROUND_UP for a faster version when a power of 2 is guaranteed) */
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#define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m))
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/* Check if n is a multiple of m */
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#define QEMU_IS_ALIGNED(n, m) (((n) % (m)) == 0)
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/* Unfortunately MSVC compatibility means explicit casting */
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#ifdef _MSC_VER
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/* n-byte align pointer down */
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#define QEMU_ALIGN_PTR_DOWN(p, n) \
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(QEMU_ALIGN_DOWN((uintptr_t)(p), (n)))
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/* n-byte align pointer up */
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#define QEMU_ALIGN_PTR_UP(p, n) \
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(QEMU_ALIGN_UP((uintptr_t)(p), (n)))
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/* Check if pointer p is n-bytes aligned */
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#define QEMU_PTR_IS_ALIGNED(p, n) QEMU_IS_ALIGNED((uintptr_t)(p), (n))
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#else
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/* n-byte align pointer down */
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#define QEMU_ALIGN_PTR_DOWN(p, n) \
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((typeof(p))QEMU_ALIGN_DOWN((uintptr_t)(p), (n)))
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/* n-byte align pointer up */
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#define QEMU_ALIGN_PTR_UP(p, n) \
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((typeof(p))QEMU_ALIGN_UP((uintptr_t)(p), (n)))
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/* Check if pointer p is n-bytes aligned */
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#define QEMU_PTR_IS_ALIGNED(p, n) QEMU_IS_ALIGNED((uintptr_t)(p), (n))
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#endif
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/* Round number up to multiple. Requires that d be a power of 2 (see
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* QEMU_ALIGN_UP for a safer but slower version on arbitrary
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* numbers); works even if d is a smaller type than n. */
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#ifndef ROUND_UP
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#define ROUND_UP(n, d) (((n) + (d) - 1) & -(0 ? (n) : (d)))
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#endif
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#ifndef DIV_ROUND_UP
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#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
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#endif
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#ifdef _MSC_VER
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#define QEMU_IS_ARRAY(x) (x)
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#else
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/*
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* &(x)[0] is always a pointer - if it's same type as x then the argument is a
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* pointer, not an array.
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*/
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#define QEMU_IS_ARRAY(x) (!__builtin_types_compatible_p(typeof(x), \
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typeof(&(x)[0])))
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#endif
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#ifndef ARRAY_SIZE
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#define ARRAY_SIZE(x) ((sizeof(x) / sizeof((x)[0])) + \
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QEMU_BUILD_BUG_ON_ZERO(!QEMU_IS_ARRAY(x)))
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#endif
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void *qemu_try_memalign(size_t alignment, size_t size);
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void *qemu_memalign(size_t alignment, size_t size);
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void *qemu_anon_ram_alloc(size_t size, uint64_t *align);
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void qemu_vfree(void *ptr);
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void qemu_anon_ram_free(void *ptr, size_t size);
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#if defined(__HAIKU__) && defined(__i386__)
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#define FMT_pid "%ld"
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#elif defined(WIN64)
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#define FMT_pid "%" PRId64
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#else
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#define FMT_pid "%d"
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#endif
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/**
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* qemu_getauxval:
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* @type: the auxiliary vector key to lookup
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*
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* Search the auxiliary vector for @type, returning the value
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* or 0 if @type is not present.
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*/
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unsigned long qemu_getauxval(unsigned long type);
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/* Starting on QEMU 2.5, qemu_hw_version() returns "2.5+" by default
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* instead of QEMU_VERSION, so setting hw_version on MachineClass
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* is no longer mandatory.
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*
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* Do NOT change this string, or it will break compatibility on all
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* machine classes that don't set hw_version.
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*/
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#define QEMU_HW_VERSION "2.5+"
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#endif
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