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powerpc/32: Blacklist functions running with MMU disabled for kprobe

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kprobe does not handle events happening in real mode, all
functions running with MMU disabled have to be blacklisted.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/3bf57066d05518644dee0840af69d36ab5086729.1585670437.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy 2020-03-31 16:03:44 +00:00 committed by Michael Ellerman
parent 32746dfe4c
commit 5f32e8361c
10 changed files with 16 additions and 0 deletions
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2
arch/powerpc/kernel/cpu_setup_6xx.S
View File

@ -288,6 +288,7 @@ _GLOBAL(__init_fpu_registers)
mtmsr r10
isync
blr
_ASM_NOKPROBE_SYMBOL(__init_fpu_registers)
/* Definitions for the table use to save CPU states */
@ -483,4 +484,5 @@ _GLOBAL(__restore_cpu_setup)
1:
mtcr r7
blr
_ASM_NOKPROBE_SYMBOL(__restore_cpu_setup)

3
arch/powerpc/kernel/entry_32.S
View File

@ -312,6 +312,7 @@ stack_ovf:
mtspr SPRN_SRR1,r10
SYNC
RFI
_ASM_NOKPROBE_SYMBOL(stack_ovf)
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
@ -1326,6 +1327,7 @@ nonrecoverable:
bl unrecoverable_exception
/* shouldn't return */
b 4b
_ASM_NOKPROBE_SYMBOL(nonrecoverable)
.section .bss
.align 2
@ -1380,4 +1382,5 @@ _GLOBAL(enter_rtas)
mtspr SPRN_SRR0,r8
mtspr SPRN_SRR1,r9
RFI /* return to caller */
_ASM_NOKPROBE_SYMBOL(enter_rtas)
#endif /* CONFIG_PPC_RTAS */

1
arch/powerpc/kernel/fpu.S
View File

@ -119,6 +119,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_VSX)
/* restore registers and return */
/* we haven't used ctr or xer or lr */
blr
_ASM_NOKPROBE_SYMBOL(load_up_fpu)
/*
* save_fpu(tsk)

1
arch/powerpc/kernel/idle_6xx.S
View File

@ -187,6 +187,7 @@ BEGIN_FTR_SECTION
mtspr SPRN_HID1, r9
END_FTR_SECTION_IFSET(CPU_FTR_DUAL_PLL_750FX)
b transfer_to_handler_cont
_ASM_NOKPROBE_SYMBOL(power_save_ppc32_restore)
.data

1
arch/powerpc/kernel/idle_e500.S
View File

@ -90,3 +90,4 @@ _GLOBAL(power_save_ppc32_restore)
#endif
b transfer_to_handler_cont
_ASM_NOKPROBE_SYMBOL(power_save_ppc32_restore)

1
arch/powerpc/kernel/l2cr_6xx.S
View File

@ -455,5 +455,6 @@ _GLOBAL(__inval_enable_L1)
sync
blr
_ASM_NOKPROBE_SYMBOL(__inval_enable_L1)

2
arch/powerpc/kernel/misc.S
View File

@ -36,6 +36,8 @@ _GLOBAL(add_reloc_offset)
add r3,r3,r5
mtlr r0
blr
_ASM_NOKPROBE_SYMBOL(reloc_offset)
_ASM_NOKPROBE_SYMBOL(add_reloc_offset)
.align 3
2: PPC_LONG 1b

2
arch/powerpc/kernel/misc_32.S
View File

@ -246,6 +246,7 @@ _GLOBAL(real_readb)
sync
isync
blr
_ASM_NOKPROBE_SYMBOL(real_readb)
/*
* Do an IO access in real mode
@ -263,6 +264,7 @@ _GLOBAL(real_writeb)
sync
isync
blr
_ASM_NOKPROBE_SYMBOL(real_writeb)
#endif /* CONFIG_40x */

2
arch/powerpc/kernel/swsusp_32.S
View File

@ -395,6 +395,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)
li r3,0
blr
_ASM_NOKPROBE_SYMBOL(swsusp_arch_resume)
/* FIXME:This construct is actually not useful since we don't shut
* down the instruction MMU, we could just flip back MSR-DR on.
@ -406,4 +407,5 @@ turn_on_mmu:
sync
isync
rfi
_ASM_NOKPROBE_SYMBOL(turn_on_mmu)

1
arch/powerpc/kernel/vector.S
View File

@ -89,6 +89,7 @@ _GLOBAL(load_up_altivec)
REST_32VRS(0,r4,r6)
/* restore registers and return */
blr
_ASM_NOKPROBE_SYMBOL(load_up_altivec)
/*
* save_altivec(tsk)