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powerpc/entry32: Blacklist syscall exit points for kprobe.

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kprobe does not handle events happening in real mode.

The very last part of syscall cannot support a trap.
Add a symbol syscall_exit_finish to identify that part and
blacklist it from kprobe.

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/23eddf49abb03d1359fa0be4206998eb3800f42c.1585670437.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy 2020-03-31 16:03:46 +00:00 committed by Michael Ellerman
parent a616c44211
commit 7cdf440138
1 changed files with 3 additions and 0 deletions
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3
arch/powerpc/kernel/entry_32.S
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@ -462,6 +462,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_NEED_PAIRED_STWCX)
lwz r7,_NIP(r1)
lwz r2,GPR2(r1)
lwz r1,GPR1(r1)
syscall_exit_finish:
#if defined(CONFIG_PPC_8xx) && defined(CONFIG_PERF_EVENTS)
mtspr SPRN_NRI, r0
#endif
@ -469,6 +470,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_NEED_PAIRED_STWCX)
mtspr SPRN_SRR1,r8
SYNC
RFI
_ASM_NOKPROBE_SYMBOL(syscall_exit_finish)
#ifdef CONFIG_44x
2: li r7,0
iccci r0,r0
@ -600,6 +602,7 @@ ret_from_kernel_syscall:
mtspr SPRN_SRR1, r10
SYNC
RFI
_ASM_NOKPROBE_SYMBOL(ret_from_kernel_syscall)
/*
* The fork/clone functions need to copy the full register set into