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* [newlib-cygwin] Implement sysconf for Arm
@ 2022-09-19 19:36 Jeff Johnston
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From: Jeff Johnston @ 2022-09-19 19:36 UTC (permalink / raw)
To: newlib-cvs
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=5230eb7f8c6b43c71d7e38d138935c48de930b76
commit 5230eb7f8c6b43c71d7e38d138935c48de930b76
Author: Jeff Johnston <jjohnstn@redhat.com>
Date: Fri Sep 16 16:04:21 2022 -0400
Implement sysconf for Arm
- add support for using sysconf to get page size in _mallocr.c via
HAVE_SYSCONF_PAGESIZE flag set in configure.host
- set flag in configure.host for arm and add a default sysconf implementation
in libc/sys/arm that returns the page size
- the default implementation can be overridden outside newlib to allow a
different page size to improve malloc on devices with a small footprint
without needing to rebuild newlib
- this patch is based on a contribution from Torbjorn Svensson and
Niklas Dahlquist (https://ecos.sourceware.org/ml/newlib/current/017616.html)
Diff:
---
newlib/configure.host | 2 ++
newlib/libc/stdlib/_mallocr.c | 2 ++
newlib/libc/sys/arm/Makefile.inc | 2 +-
newlib/libc/sys/arm/sysconf.c | 34 ++++++++++++++++++++++++++++++++++
4 files changed, 39 insertions(+), 1 deletion(-)
diff --git a/newlib/configure.host b/newlib/configure.host
index 98ce07d82..32d1436ba 100644
--- a/newlib/configure.host
+++ b/newlib/configure.host
@@ -628,6 +628,7 @@ newlib_cflags="${newlib_cflags} -DCLOCK_PROVIDED -DMALLOC_PROVIDED -DEXIT_PROVID
;;
arm*-*-pe)
syscall_dir=syscalls
+ newlib_cflags="${newlib_cflags} -DHAVE_SYSCONF_PAGESIZE"
;;
arm*-*-*)
syscall_dir=syscalls
@@ -642,6 +643,7 @@ newlib_cflags="${newlib_cflags} -DCLOCK_PROVIDED -DMALLOC_PROVIDED -DEXIT_PROVID
# newlib_cflags="${newlib_cflags} -DARM_RDP_MONITOR"
newlib_cflags="${newlib_cflags} -DARM_RDI_MONITOR"
fi
+ newlib_cflags="${newlib_cflags} -DHAVE_SYSCONF_PAGESIZE"
;;
avr*)
newlib_cflags="${newlib_cflags} -DNO_EXEC -DSMALL_MEMORY -DMISSING_SYSCALL_NAMES"
diff --git a/newlib/libc/stdlib/_mallocr.c b/newlib/libc/stdlib/_mallocr.c
index 4b53997a3..1997b6db1 100644
--- a/newlib/libc/stdlib/_mallocr.c
+++ b/newlib/libc/stdlib/_mallocr.c
@@ -320,12 +320,14 @@ extern "C" {
#endif
#ifndef _WIN32
+#ifndef HAVE_SYSCONF_PAGESIZE
#ifdef SMALL_MEMORY
#define malloc_getpagesize (128)
#else
#define malloc_getpagesize (4096)
#endif
#endif
+#endif
#if __STD_C
extern void __malloc_lock(struct _reent *);
diff --git a/newlib/libc/sys/arm/Makefile.inc b/newlib/libc/sys/arm/Makefile.inc
index 490a9630d..012295659 100644
--- a/newlib/libc/sys/arm/Makefile.inc
+++ b/newlib/libc/sys/arm/Makefile.inc
@@ -1,6 +1,6 @@
AM_CPPFLAGS_%C% = -I$(srcdir)/libc/machine/arm
-libc_a_SOURCES += %D%/access.c %D%/aeabi_atexit.c
+libc_a_SOURCES += %D%/access.c %D%/aeabi_atexit.c %D%/sysconf.c
if MAY_SUPPLY_SYSCALLS
libc_a_SOURCES += %D%/libcfunc.c %D%/trap.S %D%/syscalls.c
endif
diff --git a/newlib/libc/sys/arm/sysconf.c b/newlib/libc/sys/arm/sysconf.c
new file mode 100644
index 000000000..0fbbe31dc
--- /dev/null
+++ b/newlib/libc/sys/arm/sysconf.c
@@ -0,0 +1,34 @@
+/* libc/sys/arm/sysconf.c - The sysconf function */
+
+/* Copyright 2020, STMicroelectronics
+ *
+ * All rights reserved.
+ *
+ * Redistribution, modification, and use in source and binary forms is permitted
+ * provided that the above copyright notice and following paragraph are
+ * duplicated in all such forms.
+ *
+ * This file is distributed WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#include <unistd.h>
+#include <errno.h>
+
+long sysconf(int name)
+{
+ switch (name)
+ {
+ case _SC_PAGESIZE:
+#ifdef SMALL_MEMORY
+ return 128;
+#else
+ return 4096;
+#endif
+
+ default:
+ errno = EINVAL;
+ return -1;
+ }
+ return -1; /* Can't get here */
+}
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