Commit 5f32e836 authored by Christophe Leroy's avatar Christophe Leroy Committed by Michael Ellerman
Browse files

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



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

Signed-off-by: default avatarChristophe Leroy <christophe.leroy@c-s.fr>
Acked-by: default avatarNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/3bf57066d05518644dee0840af69d36ab5086729.1585670437.git.christophe.leroy@c-s.fr
parent 32746dfe

arch/powerpc/kernel/cpu_setup_6xx.S

+2 −0
Original line number Diff line number Diff line
@@ -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)

arch/powerpc/kernel/entry_32.S

+3 −0
Original line number Diff line number Diff line
@@ -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 */

arch/powerpc/kernel/fpu.S

+1 −0
Original line number Diff line number Diff line
@@ -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)

arch/powerpc/kernel/idle_6xx.S

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/powerpc/kernel/idle_e500.S

+1 −0
Original line number Diff line number Diff line
@@ -90,3 +90,4 @@ _GLOBAL(power_save_ppc32_restore) 
#endif



	b	transfer_to_handler_cont

_ASM_NOKPROBE_SYMBOL(power_save_ppc32_restore)