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powerpc: ABIv2 function calls must place target address in r12

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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 <anton@samba.org>
This commit is contained in:
Anton Blanchard 2014-02-04 16:07:47 +11:00
parent 7167af7ceb
commit cc7efbf919
3 changed files with 19 additions and 13 deletions
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4
arch/powerpc/kernel/entry_64.S
View File

@ -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:

20
arch/powerpc/kernel/head_64.S
View File

@ -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

8
arch/powerpc/kernel/misc_64.S
View File

@ -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); */
/*