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Subject[PATCH v2] powerpc/kprobes: Blacklist functions running with MMU disabled on PPC32
Date
kprobe does not handle events happening in real mode, all
functions running with MMU disabled have to be blacklisted.

As already done for PPC64, do it for PPC32.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
v2:
- Don't rename nonrecoverable as local, mark it noprobe instead.
- Add missing linux/kprobes.h include in pq2.c
---
arch/powerpc/include/asm/ppc_asm.h | 10 +++
arch/powerpc/kernel/cpu_setup_6xx.S | 4 +-
arch/powerpc/kernel/entry_32.S | 65 ++++++++------------
arch/powerpc/kernel/fpu.S | 1 +
arch/powerpc/kernel/idle_6xx.S | 2 +-
arch/powerpc/kernel/idle_e500.S | 2 +-
arch/powerpc/kernel/l2cr_6xx.S | 2 +-
arch/powerpc/kernel/misc.S | 2 +
arch/powerpc/kernel/misc_32.S | 4 +-
arch/powerpc/kernel/swsusp_32.S | 6 +-
arch/powerpc/kernel/vector.S | 1 +
arch/powerpc/mm/book3s32/hash_low.S | 38 ++++++------
arch/powerpc/mm/mem.c | 2 +
arch/powerpc/platforms/52xx/lite5200_sleep.S | 2 +
arch/powerpc/platforms/82xx/pq2.c | 3 +
arch/powerpc/platforms/83xx/suspend-asm.S | 1 +
arch/powerpc/platforms/powermac/cache.S | 2 +
arch/powerpc/platforms/powermac/sleep.S | 13 ++--
18 files changed, 86 insertions(+), 74 deletions(-)

diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h
index 6b03dff61a05..e8f34ba89497 100644
--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h
@@ -267,8 +267,18 @@ GLUE(.,name):
.pushsection "_kprobe_blacklist","aw"; \
PPC_LONG (entry) ; \
.popsection
+#define _NOKPROBE_ENTRY(entry) \
+ _ASM_NOKPROBE_SYMBOL(entry) \
+ _ENTRY(entry)
+#define _NOKPROBE_GLOBAL(entry) \
+ _ASM_NOKPROBE_SYMBOL(entry) \
+ _GLOBAL(entry)
#else
#define _ASM_NOKPROBE_SYMBOL(entry)
+#define _NOKPROBE_ENTRY(entry) \
+ _ENTRY(entry)
+#define _NOKPROBE_GLOBAL(entry) \
+ _GLOBAL(entry)
#endif

#define FUNC_START(name) _GLOBAL(name)
diff --git a/arch/powerpc/kernel/cpu_setup_6xx.S b/arch/powerpc/kernel/cpu_setup_6xx.S
index f6517f67265a..1cb947268546 100644
--- a/arch/powerpc/kernel/cpu_setup_6xx.S
+++ b/arch/powerpc/kernel/cpu_setup_6xx.S
@@ -276,7 +276,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_NO_DPM)
* in some 750 cpus where using a not yet initialized FPU register after
* power on reset may hang the CPU
*/
-_GLOBAL(__init_fpu_registers)
+_NOKPROBE_GLOBAL(__init_fpu_registers)
mfmsr r10
ori r11,r10,MSR_FP
mtmsr r11
@@ -381,7 +381,7 @@ _GLOBAL(__save_cpu_setup)
* restore CPU state as backed up by the previous
* function. This does not include cache setting
*/
-_GLOBAL(__restore_cpu_setup)
+_NOKPROBE_GLOBAL(__restore_cpu_setup)
/* Some CR fields are volatile, we back it up all */
mfcr r7

diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 16af0d8d90a8..f788d586254d 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -44,24 +44,21 @@
.align 12

#ifdef CONFIG_BOOKE
- .globl mcheck_transfer_to_handler
-mcheck_transfer_to_handler:
+_NOKPROBE_ENTRY(mcheck_transfer_to_handler)
mfspr r0,SPRN_DSRR0
stw r0,_DSRR0(r11)
mfspr r0,SPRN_DSRR1
stw r0,_DSRR1(r11)
/* fall through */

- .globl debug_transfer_to_handler
-debug_transfer_to_handler:
+_NOKPROBE_ENTRY(debug_transfer_to_handler)
mfspr r0,SPRN_CSRR0
stw r0,_CSRR0(r11)
mfspr r0,SPRN_CSRR1
stw r0,_CSRR1(r11)
/* fall through */

- .globl crit_transfer_to_handler
-crit_transfer_to_handler:
+_NOKPROBE_ENTRY(crit_transfer_to_handler)
#ifdef CONFIG_PPC_BOOK3E_MMU
mfspr r0,SPRN_MAS0
stw r0,MAS0(r11)
@@ -97,8 +94,7 @@ crit_transfer_to_handler:
#endif

#ifdef CONFIG_40x
- .globl crit_transfer_to_handler
-crit_transfer_to_handler:
+_NOKPROBE_ENTRY(crit_transfer_to_handler)
lwz r0,crit_r10@l(0)
stw r0,GPR10(r11)
lwz r0,crit_r11@l(0)
@@ -124,13 +120,11 @@ crit_transfer_to_handler:
* Note that we rely on the caller having set cr0.eq iff the exception
* occurred in kernel mode (i.e. MSR:PR = 0).
*/
- .globl transfer_to_handler_full
-transfer_to_handler_full:
+_NOKPROBE_ENTRY(transfer_to_handler_full)
SAVE_NVGPRS(r11)
/* fall through */

- .globl transfer_to_handler
-transfer_to_handler:
+_NOKPROBE_ENTRY(transfer_to_handler)
stw r2,GPR2(r11)
stw r12,_NIP(r11)
stw r9,_MSR(r11)
@@ -194,8 +188,7 @@ transfer_to_handler:
bt- 31-TLF_NAPPING,4f
bt- 31-TLF_SLEEPING,7f
#endif /* CONFIG_PPC_BOOK3S_32 || CONFIG_E500 */
- .globl transfer_to_handler_cont
-transfer_to_handler_cont:
+_NOKPROBE_ENTRY(transfer_to_handler_cont)
3:
mflr r9
tovirt_novmstack r2, r2 /* set r2 to current */
@@ -297,6 +290,7 @@ reenable_mmu:
* On kernel stack overflow, load up an initial stack pointer
* and call StackOverflow(regs), which should not return.
*/
+_ASM_NOKPROBE_SYMBOL(stack_ovf)
stack_ovf:
/* sometimes we use a statically-allocated stack, which is OK. */
lis r12,_end@h
@@ -460,6 +454,7 @@ 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
@@ -467,6 +462,7 @@ 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
@@ -750,8 +746,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_SPE)
addi r1,r1,INT_FRAME_SIZE
blr

- .globl fast_exception_return
-fast_exception_return:
+_NOKPROBE_ENTRY(fast_exception_return)
#if !(defined(CONFIG_4xx) || defined(CONFIG_BOOKE))
andi. r10,r9,MSR_RI /* check for recoverable interrupt */
beq 1f /* if not, we've got problems */
@@ -780,8 +775,8 @@ fast_exception_return:

#if !(defined(CONFIG_4xx) || defined(CONFIG_BOOKE))
/* check if the exception happened in a restartable section */
-1: lis r3,exc_exit_restart_end@ha
- addi r3,r3,exc_exit_restart_end@l
+1: lis r3,.Lexc_exit_restart_end@ha
+ addi r3,r3,.Lexc_exit_restart_end@l
cmplw r12,r3
#ifdef CONFIG_PPC_BOOK3S_601
bge 2b
@@ -1005,15 +1000,13 @@ END_FTR_SECTION_IFSET(CPU_FTR_NEED_PAIRED_STWCX)
LOAD_REG_IMMEDIATE(r10,MSR_KERNEL & ~MSR_RI)
SYNC
mtmsr r10 /* clear the RI bit */
- .globl exc_exit_restart
-exc_exit_restart:
+_NOKPROBE_ENTRY(exc_exit_restart)
lwz r12,_NIP(r1)
mtspr SPRN_SRR0,r12
mtspr SPRN_SRR1,r9
REST_4GPRS(9, r1)
lwz r1,GPR1(r1)
- .globl exc_exit_restart_end
-exc_exit_restart_end:
+.Lexc_exit_restart_end:
SYNC
RFI

@@ -1033,17 +1026,15 @@ exc_exit_restart_end:
li r10, 0
stw r10, 8(r1)
REST_2GPRS(9, r1)
- .globl exc_exit_restart
+_NOKPROBE_ENTRY(exc_exit_restart)
exc_exit_restart:
lwz r11,_NIP(r1)
lwz r12,_MSR(r1)
-exc_exit_start:
mtspr SPRN_SRR0,r11
mtspr SPRN_SRR1,r12
REST_2GPRS(11, r1)
lwz r1,GPR1(r1)
- .globl exc_exit_restart_end
-exc_exit_restart_end:
+.Lexc_exit_restart_end:
PPC405_ERR77_SYNC
rfi
b . /* prevent prefetch past rfi */
@@ -1146,8 +1137,7 @@ exc_exit_restart_end:
#endif

#ifdef CONFIG_40x
- .globl ret_from_crit_exc
-ret_from_crit_exc:
+_NOKPROBE_ENTRY(ret_from_crit_exc)
mfspr r9,SPRN_SPRG_THREAD
lis r10,saved_ksp_limit@ha;
lwz r10,saved_ksp_limit@l(r10);
@@ -1163,8 +1153,7 @@ ret_from_crit_exc:
#endif /* CONFIG_40x */

#ifdef CONFIG_BOOKE
- .globl ret_from_crit_exc
-ret_from_crit_exc:
+_NOKPROBE_ENTRY(ret_from_crit_exc)
mfspr r9,SPRN_SPRG_THREAD
lwz r10,SAVED_KSP_LIMIT(r1)
stw r10,KSP_LIMIT(r9)
@@ -1172,8 +1161,7 @@ ret_from_crit_exc:
RESTORE_MMU_REGS;
RET_FROM_EXC_LEVEL(SPRN_CSRR0, SPRN_CSRR1, PPC_RFCI)

- .globl ret_from_debug_exc
-ret_from_debug_exc:
+_NOKPROBE_ENTRY(ret_from_debug_exc)
mfspr r9,SPRN_SPRG_THREAD
lwz r10,SAVED_KSP_LIMIT(r1)
stw r10,KSP_LIMIT(r9)
@@ -1182,8 +1170,7 @@ ret_from_debug_exc:
RESTORE_MMU_REGS;
RET_FROM_EXC_LEVEL(SPRN_DSRR0, SPRN_DSRR1, PPC_RFDI)

- .globl ret_from_mcheck_exc
-ret_from_mcheck_exc:
+_NOKPROBE_ENTRY(ret_from_mcheck_exc)
mfspr r9,SPRN_SPRG_THREAD
lwz r10,SAVED_KSP_LIMIT(r1)
stw r10,KSP_LIMIT(r9)
@@ -1277,9 +1264,10 @@ do_user_signal: /* r10 contains MSR_KERNEL here */
* that occurred at a place where taking an exception will lose
* state information, such as the contents of SRR0 and SRR1.
*/
+_ASM_NOKPROBE_SYMBOL(nonrecoverable)
nonrecoverable:
- lis r10,exc_exit_restart_end@ha
- addi r10,r10,exc_exit_restart_end@l
+ lis r10,.Lexc_exit_restart_end@ha
+ addi r10,r10,.Lexc_exit_restart_end@l
cmplw r12,r10
#ifdef CONFIG_PPC_BOOK3S_601
bgelr
@@ -1332,7 +1320,7 @@ ee_restarts:
* On CHRP, the Run-Time Abstraction Services (RTAS) have to be
* called with the MMU off.
*/
-_GLOBAL(enter_rtas)
+_NOKPROBE_GLOBAL(enter_rtas)
stwu r1,-INT_FRAME_SIZE(r1)
mflr r0
stw r0,INT_FRAME_SIZE+4(r1)
@@ -1370,8 +1358,7 @@ _GLOBAL(enter_rtas)
mtspr SPRN_SRR1,r9
RFI /* return to caller */

- .globl machine_check_in_rtas
-machine_check_in_rtas:
+_NOKPROBE_ENTRY(machine_check_in_rtas)
twi 31,0,0
/* XXX load up BATs and panic */

diff --git a/arch/powerpc/kernel/fpu.S b/arch/powerpc/kernel/fpu.S
index 3235a8da6af7..1dfccf58fbb1 100644
--- a/arch/powerpc/kernel/fpu.S
+++ b/arch/powerpc/kernel/fpu.S
@@ -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)
diff --git a/arch/powerpc/kernel/idle_6xx.S b/arch/powerpc/kernel/idle_6xx.S
index 433d97bea1f3..37ca62fa0b75 100644
--- a/arch/powerpc/kernel/idle_6xx.S
+++ b/arch/powerpc/kernel/idle_6xx.S
@@ -149,7 +149,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
* address of current. R11 points to the exception frame (physical
* address). We have to preserve r10.
*/
-_GLOBAL(power_save_ppc32_restore)
+_NOKPROBE_GLOBAL(power_save_ppc32_restore)
lwz r9,_LINK(r11) /* interrupted in ppc6xx_idle: */
stw r9,_NIP(r11) /* make it do a blr */

diff --git a/arch/powerpc/kernel/idle_e500.S b/arch/powerpc/kernel/idle_e500.S
index 308f499e146c..8c9a781b7c11 100644
--- a/arch/powerpc/kernel/idle_e500.S
+++ b/arch/powerpc/kernel/idle_e500.S
@@ -78,7 +78,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
* r11 points to the exception frame (physical address).
* We have to preserve r10.
*/
-_GLOBAL(power_save_ppc32_restore)
+_NOKPROBE_GLOBAL(power_save_ppc32_restore)
lwz r9,_LINK(r11) /* interrupted in e500_idle */
stw r9,_NIP(r11) /* make it do a blr */

diff --git a/arch/powerpc/kernel/l2cr_6xx.S b/arch/powerpc/kernel/l2cr_6xx.S
index 2020d255585f..75e00baf0146 100644
--- a/arch/powerpc/kernel/l2cr_6xx.S
+++ b/arch/powerpc/kernel/l2cr_6xx.S
@@ -443,7 +443,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
*
* clobbers r3
*/
-_GLOBAL(__inval_enable_L1)
+_NOKPROBE_GLOBAL(__inval_enable_L1)
/* Enable and then Flash inval the instruction & data cache */
mfspr r3,SPRN_HID0
ori r3,r3, HID0_ICE|HID0_ICFI|HID0_DCE|HID0_DCI
diff --git a/arch/powerpc/kernel/misc.S b/arch/powerpc/kernel/misc.S
index 974f65f79a8e..dae46463fc81 100644
--- a/arch/powerpc/kernel/misc.S
+++ b/arch/powerpc/kernel/misc.S
@@ -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
diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S
index d80212be8698..07a2a303f0d9 100644
--- a/arch/powerpc/kernel/misc_32.S
+++ b/arch/powerpc/kernel/misc_32.S
@@ -233,7 +233,7 @@ _GLOBAL(_nmask_and_or_msr)
/*
* Do an IO access in real mode
*/
-_GLOBAL(real_readb)
+_NOKPROBE_GLOBAL(real_readb)
mfmsr r7
rlwinm r0,r7,0,~MSR_DR
sync
@@ -250,7 +250,7 @@ _GLOBAL(real_readb)
/*
* Do an IO access in real mode
*/
-_GLOBAL(real_writeb)
+_NOKPROBE_GLOBAL(real_writeb)
mfmsr r7
rlwinm r0,r7,0,~MSR_DR
sync
diff --git a/arch/powerpc/kernel/swsusp_32.S b/arch/powerpc/kernel/swsusp_32.S
index cbdf86228eaa..2dfe1afd7fc1 100644
--- a/arch/powerpc/kernel/swsusp_32.S
+++ b/arch/powerpc/kernel/swsusp_32.S
@@ -176,7 +176,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)


/* Resume code */
-_GLOBAL(swsusp_arch_resume)
+_NOKPROBE_GLOBAL(swsusp_arch_resume)

#ifdef CONFIG_ALTIVEC
/* Stop pending alitvec streams and memory accesses */
@@ -367,7 +367,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)

/* restore the MSR and turn on the MMU */
lwz r3,SL_MSR(r11)
- bl turn_on_mmu
+ bl .Lturn_on_mmu
tovirt(r11,r11)

/* Restore TB */
@@ -399,7 +399,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)
/* FIXME:This construct is actually not useful since we don't shut
* down the instruction MMU, we could just flip back MSR-DR on.
*/
-turn_on_mmu:
+.Lturn_on_mmu:
mflr r4
mtsrr0 r4
mtsrr1 r3
diff --git a/arch/powerpc/kernel/vector.S b/arch/powerpc/kernel/vector.S
index 25c14a0981bf..403ab2c32dc8 100644
--- a/arch/powerpc/kernel/vector.S
+++ b/arch/powerpc/kernel/vector.S
@@ -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)
diff --git a/arch/powerpc/mm/book3s32/hash_low.S b/arch/powerpc/mm/book3s32/hash_low.S
index 2015c4f96238..004825d7070c 100644
--- a/arch/powerpc/mm/book3s32/hash_low.S
+++ b/arch/powerpc/mm/book3s32/hash_low.S
@@ -45,7 +45,7 @@ mmu_hash_lock:
* Uses r0, r3 - r6, r8, r10, ctr, lr.
*/
.text
-_GLOBAL(hash_page)
+_NOKPROBE_GLOBAL(hash_page)
#ifdef CONFIG_SMP
lis r8, (mmu_hash_lock - PAGE_OFFSET)@h
ori r8, r8, (mmu_hash_lock - PAGE_OFFSET)@l
@@ -81,7 +81,7 @@ _GLOBAL(hash_page)
rlwinm. r8,r8,0,0,20 /* extract pt base address */
#endif
#ifdef CONFIG_SMP
- beq- hash_page_out /* return if no mapping */
+ beq- .Lhash_page_out /* return if no mapping */
#else
/* XXX it seems like the 601 will give a machine fault on the
rfi if its alignment is wrong (bottom 4 bits of address are
@@ -109,11 +109,11 @@ _GLOBAL(hash_page)
#if (PTE_FLAGS_OFFSET != 0)
addi r8,r8,PTE_FLAGS_OFFSET
#endif
-retry:
+.Lretry:
lwarx r6,0,r8 /* get linux-style pte, flag word */
andc. r5,r3,r6 /* check access & ~permission */
#ifdef CONFIG_SMP
- bne- hash_page_out /* return if access not permitted */
+ bne- .Lhash_page_out /* return if access not permitted */
#else
bnelr-
#endif
@@ -128,7 +128,7 @@ retry:
#endif /* CONFIG_SMP */
#endif /* CONFIG_PTE_64BIT */
stwcx. r5,0,r8 /* attempt to update PTE */
- bne- retry /* retry if someone got there first */
+ bne- .Lretry /* retry if someone got there first */

mfsrin r3,r4 /* get segment reg for segment */
#ifndef CONFIG_VMAP_STACK
@@ -156,7 +156,7 @@ retry:
#endif

#ifdef CONFIG_SMP
-hash_page_out:
+.Lhash_page_out:
eieio
lis r8, (mmu_hash_lock - PAGE_OFFSET)@ha
li r0,0
@@ -173,7 +173,7 @@ hash_page_out:
* the accessed bit) have already been done and that there is actually
* a hash table in use (i.e. we're not on a 603).
*/
-_GLOBAL(add_hash_page)
+_NOKPROBE_GLOBAL(add_hash_page)
mflr r0
stw r0,4(r1)

@@ -308,7 +308,7 @@ Hash_msk = (((1 << Hash_bits) - 1) * 64)
#define HASH_LEFT 31-(LG_PTEG_SIZE+Hash_bits-1)
#define HASH_RIGHT 31-LG_PTEG_SIZE

-_GLOBAL(create_hpte)
+_NOKPROBE_GLOBAL(create_hpte)
/* Convert linux-style PTE (r5) to low word of PPC-style PTE (r8) */
rlwinm r8,r5,32-9,30,30 /* _PAGE_RW -> PP msb */
rlwinm r0,r5,32-6,30,30 /* _PAGE_DIRTY -> PP msb */
@@ -360,7 +360,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_NEED_COHERENT)
1: LDPTEu r6,HPTE_SIZE(r4) /* get next PTE */
CMPPTE 0,r6,r5
bdnzf 2,1b /* loop while ctr != 0 && !cr0.eq */
- beq+ found_slot
+ beq+ .Lfound_slot

patch_site 0f, patch__hash_page_B
/* Search the secondary PTEG for a matching PTE */
@@ -372,7 +372,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_NEED_COHERENT)
2: LDPTEu r6,HPTE_SIZE(r4)
CMPPTE 0,r6,r5
bdnzf 2,2b
- beq+ found_slot
+ beq+ .Lfound_slot
xori r5,r5,PTE_H /* clear H bit again */

/* Search the primary PTEG for an empty slot */
@@ -381,7 +381,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_NEED_COHERENT)
1: LDPTEu r6,HPTE_SIZE(r4) /* get next PTE */
TST_V(r6) /* test valid bit */
bdnzf 2,1b /* loop while ctr != 0 && !cr0.eq */
- beq+ found_empty
+ beq+ .Lfound_empty

/* update counter of times that the primary PTEG is full */
lis r4, (primary_pteg_full - PAGE_OFFSET)@ha
@@ -399,7 +399,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_NEED_COHERENT)
2: LDPTEu r6,HPTE_SIZE(r4)
TST_V(r6)
bdnzf 2,2b
- beq+ found_empty
+ beq+ .Lfound_empty
xori r5,r5,PTE_H /* clear H bit again */

/*
@@ -437,9 +437,9 @@ END_FTR_SECTION_IFCLR(CPU_FTR_NEED_COHERENT)

#ifndef CONFIG_SMP
/* Store PTE in PTEG */
-found_empty:
+.Lfound_empty:
STPTE r5,0(r4)
-found_slot:
+.Lfound_slot:
STPTE r8,HPTE_SIZE/2(r4)

#else /* CONFIG_SMP */
@@ -460,8 +460,8 @@ found_slot:
* We do however have to make sure that the PTE is never in an invalid
* state with the V bit set.
*/
-found_empty:
-found_slot:
+.Lfound_empty:
+.Lfound_slot:
CLR_V(r5,r0) /* clear V (valid) bit in PTE */
STPTE r5,0(r4)
sync
@@ -493,7 +493,7 @@ htab_hash_searches:
*
* We assume that there is a hash table in use (Hash != 0).
*/
-_GLOBAL(flush_hash_pages)
+_NOKPROBE_GLOBAL(flush_hash_pages)
/*
* We disable interrupts here, even on UP, because we want
* the _PAGE_HASHPTE bit to be a reliable indication of
@@ -634,7 +634,7 @@ EXPORT_SYMBOL(flush_hash_pages)
/*
* Flush an entry from the TLB
*/
-_GLOBAL(_tlbie)
+_NOKPROBE_GLOBAL(_tlbie)
#ifdef CONFIG_SMP
lwz r8,TASK_CPU(r2)
oris r8,r8,11
@@ -671,7 +671,7 @@ _GLOBAL(_tlbie)
/*
* Flush the entire TLB. 603/603e only
*/
-_GLOBAL(_tlbia)
+_NOKPROBE_GLOBAL(_tlbia)
#if defined(CONFIG_SMP)
lwz r8,TASK_CPU(r2)
oris r8,r8,10
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index ef7b1119b2e2..7a4083a62efe 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -32,6 +32,7 @@
#include <linux/vmalloc.h>
#include <linux/memremap.h>
#include <linux/dma-direct.h>
+#include <linux/kprobes.h>

#include <asm/pgalloc.h>
#include <asm/prom.h>
@@ -470,6 +471,7 @@ static void flush_dcache_icache_phys(unsigned long physaddr)
: "r" (nb), "r" (msr), "i" (bytes), "r" (msr0)
: "ctr", "memory");
}
+NOKPROBE_SYMBOL(flush_dcache_icache_phys)
#endif // !defined(CONFIG_PPC_8xx) && !defined(CONFIG_PPC64)

/*
diff --git a/arch/powerpc/platforms/52xx/lite5200_sleep.S b/arch/powerpc/platforms/52xx/lite5200_sleep.S
index 3a9969c429b3..8ced276a6b47 100644
--- a/arch/powerpc/platforms/52xx/lite5200_sleep.S
+++ b/arch/powerpc/platforms/52xx/lite5200_sleep.S
@@ -193,6 +193,7 @@ sram_code_end:


/* uboot jumps here on resume */
+_ASM_NOKPROBE_SYMBOL(lite5200_wakeup)
lite5200_wakeup:
bl restore_regs

@@ -335,6 +336,7 @@ save_regs:
LOAD_SR(n+2, addr+2); \
LOAD_SR(n+3, addr+3);

+_ASM_NOKPROBE_SYMBOL(restore_regs)
restore_regs:
lis r4, registers@h
ori r4, r4, registers@l
diff --git a/arch/powerpc/platforms/82xx/pq2.c b/arch/powerpc/platforms/82xx/pq2.c
index 1cdd5ed9d896..3b5cb39a564c 100644
--- a/arch/powerpc/platforms/82xx/pq2.c
+++ b/arch/powerpc/platforms/82xx/pq2.c
@@ -10,6 +10,8 @@
* Copyright (c) 2006 MontaVista Software, Inc.
*/

+#include <linux/kprobes.h>
+
#include <asm/cpm2.h>
#include <asm/io.h>
#include <asm/pci-bridge.h>
@@ -29,6 +31,7 @@ void __noreturn pq2_restart(char *cmd)

panic("Restart failed\n");
}
+NOKPROBE_SYMBOL(pq2_restart)

#ifdef CONFIG_PCI
static int pq2_pci_exclude_device(struct pci_controller *hose,
diff --git a/arch/powerpc/platforms/83xx/suspend-asm.S b/arch/powerpc/platforms/83xx/suspend-asm.S
index 3acd7470dc5e..a7ba0f41ac34 100644
--- a/arch/powerpc/platforms/83xx/suspend-asm.S
+++ b/arch/powerpc/platforms/83xx/suspend-asm.S
@@ -365,6 +365,7 @@ boot_low:
isync
1: b 1b

+_ASM_NOKPROBE_SYMBOL(mpc83xx_deep_resume)
mpc83xx_deep_resume:
lis r4, 1f@h
ori r4, r4, 1f@l
diff --git a/arch/powerpc/platforms/powermac/cache.S b/arch/powerpc/platforms/powermac/cache.S
index da69e0fcb4f1..e15f4aa22e9a 100644
--- a/arch/powerpc/platforms/powermac/cache.S
+++ b/arch/powerpc/platforms/powermac/cache.S
@@ -35,6 +35,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_L2CR)
b __flush_disable_L1

/* This is the code for G3 and 74[01]0 */
+_ASM_NOKPROBE_SYMBOL(flush_disable_75x)
flush_disable_75x:
mflr r10

@@ -186,6 +187,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
blr

/* This code is for 745x processors */
+_ASM_NOKPROBE_SYMBOL(flush_disable_745x)
flush_disable_745x:
/* Turn off EE and DR in MSR */
mfmsr r11
diff --git a/arch/powerpc/platforms/powermac/sleep.S b/arch/powerpc/platforms/powermac/sleep.S
index bd6085b470b7..2a6de1b345c0 100644
--- a/arch/powerpc/platforms/powermac/sleep.S
+++ b/arch/powerpc/platforms/powermac/sleep.S
@@ -177,8 +177,8 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)
* at address 0x84. I've have some trouble with those
* parameters however and I no longer use them.
*/
- lis r5,grackle_wake_up@ha
- addi r5,r5,grackle_wake_up@l
+ lis r5,.Lgrackle_wake_up@ha
+ addi r5,r5,.Lgrackle_wake_up@l
tophys(r5,r5)
stw r5,SL_PC(r1)
lis r4,KERNELBASE@h
@@ -202,6 +202,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)
stw r5,0(r3)

.globl low_cpu_die
+_ASM_NOKPROBE_SYMBOL(low_cpu_die)
low_cpu_die:
/* Flush & disable all caches */
bl flush_disable_caches
@@ -244,7 +245,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_SPEC7450)
mtmsr r2
isync
b 1b
-
/*
* Here is the resume code.
*/
@@ -255,6 +255,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_SPEC7450)
* r4 has the physical address of SL_PC(sp) (unused)
*/
_GLOBAL(core99_wake_up)
+_ASM_NOKPROBE_SYMBOL(core99_wake_up)
/* Make sure HID0 no longer contains any sleep bit and that data cache
* is disabled
*/
@@ -287,7 +288,7 @@ _GLOBAL(core99_wake_up)
* r1 has the physical address of SL_PC(sp).
*/

-grackle_wake_up:
+.Lgrackle_wake_up:

/* Restore the kernel's segment registers before
* we do any r1 memory access as we are not sure they
@@ -407,7 +408,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)

/* restore the MSR and turn on the MMU */
lwz r3,SL_MSR(r1)
- bl turn_on_mmu
+ bl .Lturn_on_mmu

/* get back the stack pointer */
tovirt(r1,r1)
@@ -430,7 +431,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)
mtlr r0
blr

-turn_on_mmu:
+.Lturn_on_mmu:
mflr r4
tovirt(r4,r4)
mtsrr0 r4
--
2.25.0
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