Hi
The attached patch turns on support for function
and data sections for all SPARC BSPs. In my testing,u
it has reduced test sizes to about 55% of their original
size on average.
If this patch is OK, I would like to commit it
as "forward looking encouragement" so others can
help implement and use this technique on other BSPs.
--
Joel Sherrill, Ph.D. Director of Research & Development
joel.sherr...@oarcorp.com On-Line Applications Research
Ask me about RTEMS: a free RTOS Huntsville AL 35805
Support Available (256) 722-9985
>From 24a6943c66d64dd16f79eeeaf88e3af30ed6fb36 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherr...@oarcorp.com>
Date: Thu, 24 Oct 2013 18:37:17 -0500
Subject: [PATCH] sparc all BSPs: Use function and data sections
This reduces the size of the RTEMS tests on average about 45%.
---
c/src/lib/libbsp/sparc/erc32/make/custom/erc32.cfg | 3 +++
c/src/lib/libbsp/sparc/leon2/make/custom/leon2.cfg | 3 +++
c/src/lib/libbsp/sparc/leon3/make/custom/leon3.cfg | 3 +++
.../lib/libbsp/sparc/shared/startup/linkcmds.base | 17 +++++++++--------
4 files changed, 18 insertions(+), 8 deletions(-)
diff --git a/c/src/lib/libbsp/sparc/erc32/make/custom/erc32.cfg b/c/src/lib/libbsp/sparc/erc32/make/custom/erc32.cfg
index 3879d3d..2859372 100644
--- a/c/src/lib/libbsp/sparc/erc32/make/custom/erc32.cfg
+++ b/c/src/lib/libbsp/sparc/erc32/make/custom/erc32.cfg
@@ -13,3 +13,6 @@ CPU_CFLAGS = -mcpu=cypress
# optimize flag: typically -O2
CFLAGS_OPTIMIZE_V = -O2 -g
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+
+LDFLAGS = -Wl,--gc-sections
diff --git a/c/src/lib/libbsp/sparc/leon2/make/custom/leon2.cfg b/c/src/lib/libbsp/sparc/leon2/make/custom/leon2.cfg
index de5a826..af1cb1b 100644
--- a/c/src/lib/libbsp/sparc/leon2/make/custom/leon2.cfg
+++ b/c/src/lib/libbsp/sparc/leon2/make/custom/leon2.cfg
@@ -13,3 +13,6 @@ CPU_CFLAGS = -mcpu=cypress -msoft-float
# optimize flag: typically -O2
CFLAGS_OPTIMIZE_V = -O2 -g
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+
+LDFLAGS = -Wl,--gc-sections
diff --git a/c/src/lib/libbsp/sparc/leon3/make/custom/leon3.cfg b/c/src/lib/libbsp/sparc/leon3/make/custom/leon3.cfg
index ee053e0..58f2f07 100644
--- a/c/src/lib/libbsp/sparc/leon3/make/custom/leon3.cfg
+++ b/c/src/lib/libbsp/sparc/leon3/make/custom/leon3.cfg
@@ -13,3 +13,6 @@ CPU_CFLAGS = -mcpu=cypress -msoft-float
# optimize flag: typically -O2
CFLAGS_OPTIMIZE_V = -O2 -g
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+
+LDFLAGS = -Wl,--gc-sections
diff --git a/c/src/lib/libbsp/sparc/shared/startup/linkcmds.base b/c/src/lib/libbsp/sparc/shared/startup/linkcmds.base
index e61a554..fd91085 100644
--- a/c/src/lib/libbsp/sparc/shared/startup/linkcmds.base
+++ b/c/src/lib/libbsp/sparc/shared/startup/linkcmds.base
@@ -3,6 +3,7 @@
OUTPUT_ARCH(sparc)
__DYNAMIC = 0;
+ENTRY(start)
/*
* The memory map looks like this:
@@ -101,8 +102,8 @@ SECTIONS
etext = ALIGN(0x10);
_etext = .;
- *(.init)
- *(.fini)
+ KEEP(*(.init))
+ KEEP(*(.fini))
*(.lit)
*(.shdata)
. = ALIGN (16);
@@ -110,22 +111,22 @@ SECTIONS
.robsdsets : {
/* for pre rtems-libbsd FreeBSD code */
__start_set_sysctl_set = .;
- *(set_sysctl_*);
+ KEEP(*(set_sysctl_*));
__stop_set_sysctl_set = .;
- *(set_domain_*);
- *(set_pseudo_*);
+ KEEP(*(set_domain_*));
+ KEEP(*(set_pseudo_*));
/* for rtems-libbsd FreeBSD code */
_bsd__start_set_modmetadata_set = .;
- *(_bsd_set_modmetadata_set);
+ KEEP(*(_bsd_set_modmetadata_set));
_bsd__stop_set_modmetadata_set = .;
_bsd__start_set_sysctl_set = .;
- *(_bsd_set_sysctl_set);
+ KEEP(*(_bsd_set_sysctl_set));
_bsd__stop_set_sysctl_set = .;
_bsd__start_set_sysinit_set = .;
- *(_bsd_set_sysinit_*);
+ KEEP(*(_bsd_set_sysinit_*));
_bsd__stop_set_sysinit_set = .;
. = ALIGN (16);
--
1.7.1
_______________________________________________
rtems-devel mailing list
rtems-devel@rtems.org
http://www.rtems.org/mailman/listinfo/rtems-devel
