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authorJoakim Tjernlund <Joakim.Tjernlund@transmode.se>2010-01-19 14:41:56 +0100
committerWolfgang Denk <wd@denx.de>2010-01-26 19:30:13 +0100
commit0f8aa159175385ddd77bc91d11b9568583fbbd0c (patch)
tree5f2bd327b499525805cb7672eb7fca600ea5376e /cpu/mpc8260
parentfc4e188789b01dc9f18c80869c43fdd7d1a51378 (diff)
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ppc: Use r12 instead of r14 as GOT pointer.
r14 is not supposed to be clobbered by functions. Switch to r12 and call GET_GOT when needed. This will allow u-boot to loose the -ffixed-r14 gcc option. Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Diffstat (limited to 'cpu/mpc8260')
-rw-r--r--cpu/mpc8260/start.S15
1 files changed, 9 insertions, 6 deletions
diff --git a/cpu/mpc8260/start.S b/cpu/mpc8260/start.S
index 7d80af5..1fc70bc 100644
--- a/cpu/mpc8260/start.S
+++ b/cpu/mpc8260/start.S
@@ -56,7 +56,7 @@
/*
* Set up GOT: Global Offset Table
*
- * Use r14 to access the GOT
+ * Use r12 to access the GOT
*/
START_GOT
GOT_ENTRY(_GOT2_TABLE_)
@@ -650,7 +650,9 @@ init_debug:
/* RAM should now be operational */
#define VEC_WRD_CNT ((_end_of_vectors - _start + EXC_OFF_SYS_RESET) / 4)
-
+ mflr r3
+ GET_GOT
+ mtlr r3
lwz r3, GOT(_end_of_vectors)
rlwinm r4, r3, 0, 18, 31 /* _end_of_vectors & 0x3FFF */
lis r5, VEC_WRD_CNT@h
@@ -792,6 +794,7 @@ relocate_code:
mr r9, r4 /* Save copy of Global Data pointer */
mr r10, r5 /* Save copy of Destination Address */
+ GET_GOT
mr r3, r5 /* Destination Address */
lis r4, CONFIG_SYS_MONITOR_BASE@h /* Source Address */
ori r4, r4, CONFIG_SYS_MONITOR_BASE@l
@@ -809,7 +812,7 @@ relocate_code:
sub r15, r10, r4
/* First our own GOT */
- add r14, r14, r15
+ add r12, r12, r15
/* then the one used by the C code */
add r30, r30, r15
@@ -882,7 +885,7 @@ relocate_code:
in_ram:
/*
- * Relocation Function, r14 point to got2+0x8000
+ * Relocation Function, r12 point to got2+0x8000
*
* Adjust got2 pointers, no need to check for 0, this code
* already puts a few entries in the table.
@@ -958,6 +961,8 @@ clear_bss:
*/
.globl trap_init
trap_init:
+ mflr r4 /* save link register */
+ GET_GOT
lwz r7, GOT(_start)
lwz r8, GOT(_end_of_vectors)
@@ -965,8 +970,6 @@ trap_init:
cmplw 0, r7, r8
bgelr /* return if r7>=r8 - just in case */
-
- mflr r4 /* save link register */
1:
lwz r0, 0(r7)
stw r0, 0(r9)