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authorPaul Mackerras <paulus@samba.org>2008-08-30 11:41:12 +1000
committerPaul Mackerras <paulus@samba.org>2008-09-15 11:08:35 -0700
commite31aa453bbc4886a7bd33e5c2afa526d6f55bd7a (patch)
treefefa13c13d7b1803fdaeb92143f83b1971f0ec8d /arch/powerpc/platforms
parent1f6a93e4c35e75d547b51f56ba8139ab1a91628c (diff)
powerpc: Use LOAD_REG_IMMEDIATE only for constants on 64-bit
Using LOAD_REG_IMMEDIATE to get the address of kernel symbols generates 5 instructions where LOAD_REG_ADDR can do it in one, and will generate R_PPC64_ADDR16_* relocations in the output when we get to making the kernel as a position-independent executable, which we'd rather not have to handle. This changes various bits of assembly code to use LOAD_REG_ADDR when we need to get the address of a symbol, or to use suitable position-independent code for cases where we can't access the TOC for various reasons, or if we're not running at the address we were linked at. It also cleans up a few minor things; there's no reason to save and restore SRR0/1 around RTAS calls, __mmu_off can get the return address from LR more conveniently than the caller can supply it in R4 (and we already assume elsewhere that EA == RA if the MMU is on in early boot), and enable_64b_mode was using 5 instructions where 2 would do. Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/platforms')
-rw-r--r--arch/powerpc/platforms/iseries/exception.S23
1 files changed, 10 insertions, 13 deletions
diff --git a/arch/powerpc/platforms/iseries/exception.S b/arch/powerpc/platforms/iseries/exception.S
index 8ff330d026c..2f581521eb9 100644
--- a/arch/powerpc/platforms/iseries/exception.S
+++ b/arch/powerpc/platforms/iseries/exception.S
@@ -38,12 +38,13 @@
.globl system_reset_iSeries
system_reset_iSeries:
+ bl .relative_toc
mfspr r13,SPRN_SPRG3 /* Get alpaca address */
- LOAD_REG_IMMEDIATE(r23, alpaca)
+ LOAD_REG_ADDR(r23, alpaca)
li r0,ALPACA_SIZE
sub r23,r13,r23
divdu r23,r23,r0 /* r23 has cpu number */
- LOAD_REG_IMMEDIATE(r13, paca)
+ LOAD_REG_ADDR(r13, paca)
mulli r0,r23,PACA_SIZE
add r13,r13,r0
mtspr SPRN_SPRG3,r13 /* Save it away for the future */
@@ -60,14 +61,14 @@ system_reset_iSeries:
mtspr SPRN_CTRLT,r4
/* Spin on __secondary_hold_spinloop until it is updated by the boot cpu. */
-/* In the UP case we'll yeild() later, and we will not access the paca anyway */
+/* In the UP case we'll yield() later, and we will not access the paca anyway */
#ifdef CONFIG_SMP
1:
HMT_LOW
- LOAD_REG_IMMEDIATE(r23, __secondary_hold_spinloop)
+ LOAD_REG_ADDR(r23, __secondary_hold_spinloop)
ld r23,0(r23)
sync
- LOAD_REG_IMMEDIATE(r3,current_set)
+ LOAD_REG_ADDR(r3,current_set)
sldi r28,r24,3 /* get current_set[cpu#] */
ldx r3,r3,r28
addi r1,r3,THREAD_SIZE
@@ -90,7 +91,7 @@ system_reset_iSeries:
lbz r23,PACAPROCSTART(r13) /* Test if this processor
* should start */
sync
- LOAD_REG_IMMEDIATE(r3,current_set)
+ LOAD_REG_ADDR(r3,current_set)
sldi r28,r24,3 /* get current_set[cpu#] */
ldx r3,r3,r28
addi r1,r3,THREAD_SIZE
@@ -255,8 +256,8 @@ hardware_interrupt_iSeries_masked:
_INIT_STATIC(__start_initialization_iSeries)
/* Clear out the BSS */
- LOAD_REG_IMMEDIATE(r11,__bss_stop)
- LOAD_REG_IMMEDIATE(r8,__bss_start)
+ LOAD_REG_ADDR(r11,__bss_stop)
+ LOAD_REG_ADDR(r8,__bss_start)
sub r11,r11,r8 /* bss size */
addi r11,r11,7 /* round up to an even double word */
rldicl. r11,r11,61,3 /* shift right by 3 */
@@ -267,15 +268,11 @@ _INIT_STATIC(__start_initialization_iSeries)
3: stdu r0,8(r8)
bdnz 3b
4:
- LOAD_REG_IMMEDIATE(r1,init_thread_union)
+ LOAD_REG_ADDR(r1,init_thread_union)
addi r1,r1,THREAD_SIZE
li r0,0
stdu r0,-STACK_FRAME_OVERHEAD(r1)
- LOAD_REG_IMMEDIATE(r2,__toc_start)
- addi r2,r2,0x4000
- addi r2,r2,0x4000
-
bl .iSeries_early_setup
bl .early_setup