To establish addressability quickly, ABIv2 requires the target
address of the function being called to be in r12. Fix a number of
places in assembly code that we do indirect function calls.
We need to avoid function descriptors on ABIv2 too.
Signed-off-by: Anton Blanchard <an...@samba.org>
---
arch/powerpc/kernel/entry_64.S | 4 ++--
arch/powerpc/kernel/head_64.S | 20 +++++++++++---------
arch/powerpc/kernel/misc_64.S | 8 ++++++--
3 files changed, 19 insertions(+), 13 deletions(-)
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 2662f02..d23d752 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -174,8 +174,8 @@ system_call: /* label this so stack
traces look sane */
clrldi r8,r8,32
15:
slwi r0,r0,4
- ldx r10,r11,r0 /* Fetch system call handler [ptr] */
- mtctr r10
+ ldx r12,r11,r0 /* Fetch system call handler [ptr] */
+ mtctr r12
bctrl /* Call handler */
syscall_exit:
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 8284124..97329a1 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -140,16 +140,18 @@ __secondary_hold:
tovirt(r26,r26)
#endif
/* All secondary cpus wait here until told to start. */
-100: ld r4,__secondary_hold_spinloop-_stext(r26)
- cmpdi 0,r4,0
+100: ld r12,__secondary_hold_spinloop-_stext(r26)
+ cmpdi 0,r12,0
beq 100b
#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
#ifdef CONFIG_PPC_BOOK3E
- tovirt(r4,r4)
+ tovirt(r12,r12)
#endif
- ld r4,0(r4) /* deref function descriptor */
- mtctr r4
+#if !defined(_CALL_ELF) || _CALL_ELF != 2
+ ld r12,0(r12) /* deref function descriptor */
+#endif
+ mtctr r12
mr r3,r24
/*
* it may be the case that other platforms have r4 right to
@@ -267,8 +269,8 @@ generic_secondary_common_init:
ld r23,CPU_SPEC_RESTORE(r23)
cmpdi 0,r23,0
beq 3f
- ld r23,0(r23)
- mtctr r23
+ ld r12,0(r23)
+ mtctr r12
bctrl
3: LOAD_REG_ADDR(r3, spinning_secondaries) /* Decrement
spinning_secondaries */
@@ -468,8 +470,8 @@ __after_prom_start:
/* this includes the code being */
/* executed here. */
addis r8,r3,(4f - _stext)@ha /* Jump to the copy of this code */
- addi r8,r8,(4f - _stext)@l /* that we just made */
- mtctr r8
+ addi r12,r8,(4f - _stext)@l /* that we just made */
+ mtctr r12
bctr
.balign 8
diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
index b39cf4a..bda85a1 100644
--- a/arch/powerpc/kernel/misc_64.S
+++ b/arch/powerpc/kernel/misc_64.S
@@ -595,8 +595,12 @@ _GLOBAL(kexec_sequence)
stw r6,kexec_flag-1b(5)
/* clear out hardware hash page table and tlb */
- ld r5,0(r27) /* deref function descriptor */
- mtctr r5
+#if !defined(_CALL_ELF) || _CALL_ELF != 2
+ ld r12,0(r27) /* deref function descriptor */
+#else
+ mr r12,r27
+#endif
+ mtctr r12
bctrl /* ppc_md.hpte_clear_all(void); */
/*
--
1.8.3.2
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