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225 lines
7.4 KiB
225 lines
7.4 KiB
6 years ago
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commit 99f8dc922033821edcc13f9f8360e9fda40dfcff
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Author: Siddhesh Poyarekar <siddhesh@redhat.com>
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Date: Thu Jul 3 01:28:45 2014 +0530
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Fix -Wundef warning on PAGE_COPY_THRESHOLD
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The PAGE_COPY_THRESHOLD macro is meant to be overridden by
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architecture-specific pagecopy.h, but it is currently done only by
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mach; all other architectures use the default. Check to see if the
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macro is defined in addition to whether it is set to a non-zero value.
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Conflicts:
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sysdeps/generic/pagecopy.h
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Due to copyright header change.
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diff --git a/debug/memcpy_chk.c b/debug/memcpy_chk.c
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index bd43583ff4239c8a..4af85a8cb8f5c8de 100644
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--- a/debug/memcpy_chk.c
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+++ b/debug/memcpy_chk.c
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@@ -20,7 +20,6 @@
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#include <string.h>
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#include <memcopy.h>
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-#include <pagecopy.h>
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void *
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__memcpy_chk (dstpp, srcpp, len, dstlen)
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diff --git a/debug/mempcpy_chk.c b/debug/mempcpy_chk.c
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index 8e26953764ff1b35..9a4f0e2fbcdde951 100644
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--- a/debug/mempcpy_chk.c
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+++ b/debug/mempcpy_chk.c
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@@ -21,7 +21,6 @@
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#include <string.h>
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#include <memcopy.h>
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-#include <pagecopy.h>
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void *
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__mempcpy_chk (dstpp, srcpp, len, dstlen)
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diff --git a/string/memcpy.c b/string/memcpy.c
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index 3080fcb4de4cec83..fa1ec24eaca527c4 100644
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--- a/string/memcpy.c
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+++ b/string/memcpy.c
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@@ -20,7 +20,6 @@
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#include <string.h>
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#include <memcopy.h>
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-#include <pagecopy.h>
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#undef memcpy
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diff --git a/string/memmove.c b/string/memmove.c
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index c59e7a9c2a640f7d..51bff31c0530ba91 100644
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--- a/string/memmove.c
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+++ b/string/memmove.c
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@@ -20,7 +20,6 @@
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#include <string.h>
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#include <memcopy.h>
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-#include <pagecopy.h>
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/* All this is so that bcopy.c can #include
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this file after defining some things. */
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diff --git a/sysdeps/generic/memcopy.h b/sysdeps/generic/memcopy.h
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index 08892a4ea33f1ca7..d0ffcd33b007ba38 100644
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--- a/sysdeps/generic/memcopy.h
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+++ b/sysdeps/generic/memcopy.h
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@@ -40,6 +40,7 @@
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#include <sys/cdefs.h>
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#include <endian.h>
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+#include <pagecopy.h>
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/* The macros defined in this file are:
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@@ -144,6 +145,47 @@ extern void _wordcopy_bwd_dest_aligned (long int, long int, size_t) __THROW;
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(nbytes_left) = (nbytes) % OPSIZ; \
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} while (0)
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+/* The macro PAGE_COPY_FWD_MAYBE (dstp, srcp, nbytes_left, nbytes) is invoked
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+ like WORD_COPY_FWD et al. The pointers should be at least word aligned.
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+ This will check if virtual copying by pages can and should be done and do it
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+ if so. The pointers will be aligned to PAGE_SIZE bytes. The macro requires
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+ that pagecopy.h defines at least PAGE_COPY_THRESHOLD to 0. If
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+ PAGE_COPY_THRESHOLD is non-zero, the header must also define PAGE_COPY_FWD
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+ and PAGE_SIZE.
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+*/
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+#if PAGE_COPY_THRESHOLD
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+
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+# include <assert.h>
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+
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+# define PAGE_COPY_FWD_MAYBE(dstp, srcp, nbytes_left, nbytes) \
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+ do \
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+ { \
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+ if ((nbytes) >= PAGE_COPY_THRESHOLD && \
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+ PAGE_OFFSET ((dstp) - (srcp)) == 0) \
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+ { \
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+ /* The amount to copy is past the threshold for copying \
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+ pages virtually with kernel VM operations, and the \
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+ source and destination addresses have the same alignment. */ \
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+ size_t nbytes_before = PAGE_OFFSET (-(dstp)); \
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+ if (nbytes_before != 0) \
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+ { \
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+ /* First copy the words before the first page boundary. */ \
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+ WORD_COPY_FWD (dstp, srcp, nbytes_left, nbytes_before); \
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+ assert (nbytes_left == 0); \
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+ nbytes -= nbytes_before; \
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+ } \
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+ PAGE_COPY_FWD (dstp, srcp, nbytes_left, nbytes); \
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+ } \
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+ } while (0)
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+
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+/* The page size is always a power of two, so we can avoid modulo division. */
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+# define PAGE_OFFSET(n) ((n) & (PAGE_SIZE - 1))
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+
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+#else
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+
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+# define PAGE_COPY_FWD_MAYBE(dstp, srcp, nbytes_left, nbytes) /* nada */
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+
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+#endif
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/* Threshold value for when to enter the unrolled loops. */
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#define OP_T_THRES 16
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diff --git a/sysdeps/generic/pagecopy.h b/sysdeps/generic/pagecopy.h
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index 89f392cb43c4dcbc..3c81de1b236486bf 100644
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--- a/sysdeps/generic/pagecopy.h
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+++ b/sysdeps/generic/pagecopy.h
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@@ -1,5 +1,5 @@
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-/* Macros for copying by pages; used in memcpy, memmove. Generic macros.
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- Copyright (C) 1995, 1997 Free Software Foundation, Inc.
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+/* Macros for copying by pages; used in memcpy, memmove.
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+ Copyright (C) 1995-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@@ -16,19 +16,15 @@
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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-/* This file defines the macro:
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+/* The macro PAGE_COPY_FWD_MAYBE defined in memcopy.h is used in memmove if the
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+ PAGE_COPY_THRESHOLD macro is set to a non-zero value. The default is 0,
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+ that is copying by pages is not implemented.
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- PAGE_COPY_FWD_MAYBE (dstp, srcp, nbytes_left, nbytes)
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-
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- which is invoked like WORD_COPY_FWD et al. The pointers should be at
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- least word aligned. This will check if virtual copying by pages can and
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- should be done and do it if so.
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-
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- System-specific pagecopy.h files should define these macros and then
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- #include this file:
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+ System-specific pagecopy.h files that want to support page copying should
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+ define these macros:
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PAGE_COPY_THRESHOLD
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- -- Minimum size for which virtual copying by pages is worthwhile.
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+ -- A non-zero minimum size for which virtual copying by pages is worthwhile.
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PAGE_SIZE
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-- Size of a page.
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@@ -38,37 +34,4 @@
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The pointers will be aligned to PAGE_SIZE bytes.
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*/
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-
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-#if PAGE_COPY_THRESHOLD
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-
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-#include <assert.h>
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-
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-#define PAGE_COPY_FWD_MAYBE(dstp, srcp, nbytes_left, nbytes) \
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- do \
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- { \
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- if ((nbytes) >= PAGE_COPY_THRESHOLD && \
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- PAGE_OFFSET ((dstp) - (srcp)) == 0) \
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- { \
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- /* The amount to copy is past the threshold for copying \
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- pages virtually with kernel VM operations, and the \
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- source and destination addresses have the same alignment. */ \
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- size_t nbytes_before = PAGE_OFFSET (-(dstp)); \
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- if (nbytes_before != 0) \
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- { \
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- /* First copy the words before the first page boundary. */ \
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- WORD_COPY_FWD (dstp, srcp, nbytes_left, nbytes_before); \
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- assert (nbytes_left == 0); \
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- nbytes -= nbytes_before; \
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- } \
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- PAGE_COPY_FWD (dstp, srcp, nbytes_left, nbytes); \
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- } \
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- } while (0)
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-
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-/* The page size is always a power of two, so we can avoid modulo division. */
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-#define PAGE_OFFSET(n) ((n) & (PAGE_SIZE - 1))
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-
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-#else
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-
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-#define PAGE_COPY_FWD_MAYBE(dstp, srcp, nbytes_left, nbytes) /* nada */
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-
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-#endif
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+#define PAGE_COPY_THRESHOLD 0
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diff --git a/sysdeps/mach/pagecopy.h b/sysdeps/mach/pagecopy.h
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index 5b212144b7b163fe..8cce76a6d76698b9 100644
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--- a/sysdeps/mach/pagecopy.h
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+++ b/sysdeps/mach/pagecopy.h
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@@ -30,6 +30,3 @@
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(vm_address_t) dstp) == KERN_SUCCESS \
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? trunc_page (nbytes) \
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: 0)))
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-
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-/* Get the generic macro. */
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-#include <sysdeps/generic/pagecopy.h>
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diff --git a/sysdeps/powerpc/memmove.c b/sysdeps/powerpc/memmove.c
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index 1617ecea95620133..50734e45458352c5 100644
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--- a/sysdeps/powerpc/memmove.c
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+++ b/sysdeps/powerpc/memmove.c
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@@ -20,7 +20,6 @@
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#include <string.h>
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#include <memcopy.h>
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-#include <pagecopy.h>
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/* All this is so that bcopy.c can #include
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this file after defining some things. */
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