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From: Jeff Johnston <jjohnstn@sourceware.org> To: newlib-cvs@sourceware.org Subject: [newlib-cygwin] Implement sysconf for Arm Date: Mon, 19 Sep 2022 19:36:43 +0000 (GMT) [thread overview] Message-ID: <20220919193643.987DE3858D28@sourceware.org> (raw) 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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