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authorJoakim Tjernlund <Joakim.Tjernlund@transmode.se>2010-01-19 14:41:55 +0100
committerWolfgang Denk <wd@denx.de>2010-01-26 19:30:12 +0100
commitfc4e188789b01dc9f18c80869c43fdd7d1a51378 (patch)
treebff9ddbb66b0e5946f1bf73da1021f3ce1befc0d /lib_ppc
parent2903ad33a71251a3a87485b5b185852c8998f209 (diff)
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ppc: Loose GOT access in IRQ
Using the GOT in IRQ handlers requires r14 to be -ffixed-r14. Avoid this by relocatate transfer_to_handler too. This will allow to free up r14 later on. Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Diffstat (limited to 'lib_ppc')
-rw-r--r--lib_ppc/Makefile1
-rw-r--r--lib_ppc/reloc.S49
2 files changed, 50 insertions, 0 deletions
diff --git a/lib_ppc/Makefile b/lib_ppc/Makefile
index 60a7625..334e457 100644
--- a/lib_ppc/Makefile
+++ b/lib_ppc/Makefile
@@ -28,6 +28,7 @@ LIB = $(obj)lib$(ARCH).a
SOBJS-y += ppccache.o
SOBJS-y += ppcstring.o
SOBJS-y += ticks.o
+SOBJS-y += reloc.o
COBJS-y += bat_rw.o
COBJS-y += board.o
diff --git a/lib_ppc/reloc.S b/lib_ppc/reloc.S
new file mode 100644
index 0000000..50f9a83
--- /dev/null
+++ b/lib_ppc/reloc.S
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2009 Wolfgang Denk <wd@denx.de>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <ppc_asm.tmpl>
+
+ .file "reloc.S"
+
+ .text
+#ifndef CONFIG_NAND_SPL
+ /*
+ * Function: relocate entries for one exception vector
+ */
+ .globl trap_reloc
+ .type trap_reloc, @function
+trap_reloc:
+ lwz r0, 0(r7) /* hdlr ... */
+ add r0, r0, r3 /* ... += dest_addr */
+ stw r0, 0(r7)
+
+ lwz r0, 4(r7) /* int_return ... */
+ add r0, r0, r3 /* ... += dest_addr */
+ stw r0, 4(r7)
+
+ lwz r0, 8(r7) /* transfer_to_handler ...*/
+ add r0, r0, r3 /* ... += dest_addr */
+ stw r0, 8(r7)
+
+ blr
+ .size trap_reloc, .-trap_reloc
+#endif