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authorJoakim Tjernlund <Joakim.Tjernlund@transmode.se>2010-12-06 18:35:37 +0100
committerWolfgang Denk <wd@denx.de>2011-04-11 21:38:47 +0200
commit39768f7715ed637ef02f49fc7de664cc1aaf14b3 (patch)
treea5cc618786f64865df878d1d025de7672b5036da /arch/powerpc/cpu/ppc4xx
parent33ee4c92339ee386662c0ee2d221098c5cc8b07e (diff)
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PowerPC: Add support for -msingle-pic-base
-msingle-pic-base is a new gcc option for ppc and it reduces the size of my u-boot with 6-8 KB. While at it, add -fno-jump-tables too to save a few more bytes. -msingle-pic-base will be in gcc 4.6, however backported patches are available at http://bugs.gentoo.org/show_bug.cgi?id=347281 Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Diffstat (limited to 'arch/powerpc/cpu/ppc4xx')
-rw-r--r--arch/powerpc/cpu/ppc4xx/start.S22
1 files changed, 20 insertions, 2 deletions
diff --git a/arch/powerpc/cpu/ppc4xx/start.S b/arch/powerpc/cpu/ppc4xx/start.S
index b43e22c..aa03d9a 100644
--- a/arch/powerpc/cpu/ppc4xx/start.S
+++ b/arch/powerpc/cpu/ppc4xx/start.S
@@ -262,6 +262,11 @@
bl reconfig_tlb0
#endif
GET_GOT
+#if defined(__pic__) && __pic__ == 1
+ /* Needed for upcoming -msingle-pic-base */
+ bl _GLOBAL_OFFSET_TABLE_@local-4
+ mflr r30
+#endif
bl cpu_init_f /* run low-level CPU init code (from Flash) */
bl board_init_f
/* NOTREACHED - board_init_f() does not return */
@@ -799,7 +804,11 @@ _start:
ori r0,r0, RESET_VECTOR@l
stwu r1,-8(r1) /* Save back chain and move SP */
stw r0,+12(r1) /* Save return addr (underflow vect) */
-
+#if defined(__pic__) && __pic__ == 1
+ /* Needed for upcoming -msingle-pic-base */
+ bl _GLOBAL_OFFSET_TABLE_@local-4
+ mflr r30
+#endif
#ifdef CONFIG_NAND_SPL
bl nand_boot_common /* will not return */
#else
@@ -914,7 +923,11 @@ _start:
stwu r0, -4(r1) /* stack backtraces terminate cleanly */
GET_GOT /* initialize GOT access */
-
+#if defined(__pic__) && __pic__ == 1
+ /* Needed for upcoming -msingle-pic-base */
+ bl _GLOBAL_OFFSET_TABLE_@local-4
+ mflr r30
+#endif
bl board_init_f /* run first part of init code (from Flash) */
/* NOTREACHED - board_init_f() does not return */
@@ -1179,6 +1192,11 @@ _start:
stw r0, +12(r1) /* Save return addr (underflow vect) */
#endif /* CONFIG_SYS_INIT_DCACHE_CS */
+#if defined(__pic__) && __pic__ == 1
+ /* Needed for upcoming -msingle-pic-base */
+ bl _GLOBAL_OFFSET_TABLE_@local-4
+ mflr r30
+#endif
#ifdef CONFIG_NAND_SPL
bl nand_boot_common /* will not return */
#else