diff options
| author | Paul Mackerras <paulus@samba.org> | 2008-08-30 11:41:12 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-09-15 11:08:35 -0700 |
| commit | e31aa453bbc4886a7bd33e5c2afa526d6f55bd7a (patch) | |
| tree | fefa13c13d7b1803fdaeb92143f83b1971f0ec8d /arch/powerpc/kernel/cpu_setup_ppc970.S | |
| parent | 1f6a93e4c35e75d547b51f56ba8139ab1a91628c (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/kernel/cpu_setup_ppc970.S')
| -rw-r--r-- | arch/powerpc/kernel/cpu_setup_ppc970.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/cpu_setup_ppc970.S b/arch/powerpc/kernel/cpu_setup_ppc970.S index bf118c38575..27f2507279d 100644 --- a/arch/powerpc/kernel/cpu_setup_ppc970.S +++ b/arch/powerpc/kernel/cpu_setup_ppc970.S @@ -110,7 +110,7 @@ load_hids: isync /* Save away cpu state */ - LOAD_REG_IMMEDIATE(r5,cpu_state_storage) + LOAD_REG_ADDR(r5,cpu_state_storage) /* Save HID0,1,4 and 5 */ mfspr r3,SPRN_HID0 @@ -134,7 +134,7 @@ _GLOBAL(__restore_cpu_ppc970) rldicl. r0,r0,4,63 beqlr - LOAD_REG_IMMEDIATE(r5,cpu_state_storage) + LOAD_REG_ADDR(r5,cpu_state_storage) /* Before accessing memory, we make sure rm_ci is clear */ li r0,0 mfspr r3,SPRN_HID4 |