[PATCH v2 11/14] powerpc/32: Always enable data translation in exception prolog

From: Christophe Leroy
Date: Fri Jan 22 2021 - 05:19:00 EST

If the code can use a stack in vm area, it can also use a
stack in linear space.

Simplify code by removing old non VMAP stack code on PPC32.

That means the data translation is now re-enabled early in
exception prolog in all cases, not only when using VMAP stacks.

Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
---
arch/powerpc/include/asm/processor.h | 4 +-
arch/powerpc/kernel/asm-offsets.c | 2 -
arch/powerpc/kernel/entry_32.S | 26 ++-----
arch/powerpc/kernel/fpu.S | 2 -
arch/powerpc/kernel/head_32.h | 106 +--------------------------
arch/powerpc/kernel/head_40x.S | 25 -------
arch/powerpc/kernel/head_8xx.S | 19 +----
arch/powerpc/kernel/head_book3s_32.S | 38 +---------
arch/powerpc/kernel/head_booke.h | 2 -
arch/powerpc/kernel/idle_6xx.S | 12 +--
arch/powerpc/kernel/idle_e500.S | 4 +-
arch/powerpc/kernel/vector.S | 2 -
arch/powerpc/mm/book3s32/hash_low.S | 14 ----
13 files changed, 17 insertions(+), 239 deletions(-)

diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index 8acc3590c971..33f1a2587ead 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -148,11 +148,9 @@ struct thread_struct {
#ifdef CONFIG_PPC_RTAS
unsigned long rtas_sp; /* stack pointer for when in RTAS */
#endif
-#endif
#if defined(CONFIG_PPC_BOOK3S_32) && defined(CONFIG_PPC_KUAP)
unsigned long kuap; /* opened segments for user access */
#endif
-#ifdef CONFIG_VMAP_STACK
unsigned long srr0;
unsigned long srr1;
unsigned long dar;
@@ -161,7 +159,7 @@ struct thread_struct {
unsigned long r0, r3, r4, r5, r6, r8, r9, r11;
unsigned long lr, ctr;
#endif
-#endif
+#endif /* CONFIG_PPC32 */
/* Debug Registers */
struct debug_reg debug;
#ifdef CONFIG_PPC_FPU_REGS
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index b12d7c049bfe..a01bc9e8508b 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -132,7 +132,6 @@ int main(void)
OFFSET(KSP_VSID, thread_struct, ksp_vsid);
#else /* CONFIG_PPC64 */
OFFSET(PGDIR, thread_struct, pgdir);
-#ifdef CONFIG_VMAP_STACK
OFFSET(SRR0, thread_struct, srr0);
OFFSET(SRR1, thread_struct, srr1);
OFFSET(DAR, thread_struct, dar);
@@ -149,7 +148,6 @@ int main(void)
OFFSET(THLR, thread_struct, lr);
OFFSET(THCTR, thread_struct, ctr);
#endif
-#endif
#ifdef CONFIG_SPE
OFFSET(THREAD_EVR0, thread_struct, evr[0]);
OFFSET(THREAD_ACC, thread_struct, acc);
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 859a13d34bdc..8a0e5885b731 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -141,7 +141,7 @@ transfer_to_handler:
stw r12,_CTR(r11)
stw r2,_XER(r11)
mfspr r12,SPRN_SPRG_THREAD
- tovirt_vmstack r12, r12
+ tovirt(r12, r12)
beq 2f /* if from user, fix up THREAD.regs */
addi r2, r12, -THREAD
addi r11,r1,STACK_FRAME_OVERHEAD
@@ -162,7 +162,6 @@ transfer_to_handler:
li r12,-1 /* clear all pending debug events */
mtspr SPRN_DBSR,r12
lis r11,global_dbcr0@ha
- tophys_novmstack r11,r11
addi r11,r11,global_dbcr0@l
#ifdef CONFIG_SMP
lwz r9,TASK_CPU(r2)
@@ -199,8 +198,7 @@ transfer_to_handler:
transfer_to_handler_cont:
3:
mflr r9
- tovirt_novmstack r2, r2 /* set r2 to current */
- tovirt_vmstack r9, r9
+ tovirt(r9, r9)
lwz r11,0(r9) /* virtual address of handler */
lwz r9,4(r9) /* where to go when done */
#if defined(CONFIG_PPC_8xx) && defined(CONFIG_PERF_EVENTS)
@@ -215,8 +213,7 @@ transfer_to_handler_cont:
* To speed up the syscall path where interrupts stay on, let's check
* first if we are changing the MSR value at all.
*/
- tophys_novmstack r12, r1
- lwz r12,_MSR(r12)
+ lwz r12,_MSR(r1)
andi. r12,r12,MSR_EE
bne 1f

@@ -308,9 +305,6 @@ stack_ovf:
lis r9,StackOverflow@ha
addi r9,r9,StackOverflow@l
LOAD_REG_IMMEDIATE(r10,MSR_KERNEL)
-#if defined(CONFIG_PPC_8xx) && defined(CONFIG_PERF_EVENTS)
- mtspr SPRN_NRI, r0
-#endif
mtspr SPRN_SRR0,r9
mtspr SPRN_SRR1,r10
rfi
@@ -1327,7 +1321,6 @@ _GLOBAL(enter_rtas)
lis r6,1f@ha /* physical return address for rtas */
addi r6,r6,1f@l
tophys(r6,r6)
- tophys_novmstack r7, r1
lwz r8,RTASENTRY(r4)
lwz r4,RTASBASE(r4)
mfmsr r9
@@ -1336,22 +1329,19 @@ _GLOBAL(enter_rtas)
mtmsr r0 /* disable interrupts so SRR0/1 don't get trashed */
li r9,MSR_KERNEL & ~(MSR_IR|MSR_DR)
mtlr r6
- stw r7, THREAD + RTAS_SP(r2)
+ stw r1, THREAD + RTAS_SP(r2)
mtspr SPRN_SRR0,r8
mtspr SPRN_SRR1,r9
rfi
-1: tophys_novmstack r9, r1
-#ifdef CONFIG_VMAP_STACK
+1:
li r0, MSR_KERNEL & ~MSR_IR /* can take DTLB miss */
mtmsr r0
isync
-#endif
- lwz r8,INT_FRAME_SIZE+4(r9) /* get return address */
- lwz r9,8(r9) /* original msr value */
+ lwz r8,INT_FRAME_SIZE+4(r1) /* get return address */
+ lwz r9,8(r1) /* original msr value */
addi r1,r1,INT_FRAME_SIZE
li r0,0
- tophys_novmstack r7, r2
- stw r0, THREAD + RTAS_SP(r7)
+ stw r0, THREAD + RTAS_SP(r2)
mtspr SPRN_SRR0,r8
mtspr SPRN_SRR1,r9
rfi /* return to caller */
diff --git a/arch/powerpc/kernel/fpu.S b/arch/powerpc/kernel/fpu.S
index 3ff9a8fafa46..2c57ece6671c 100644
--- a/arch/powerpc/kernel/fpu.S
+++ b/arch/powerpc/kernel/fpu.S
@@ -92,9 +92,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_VSX)
/* enable use of FP after return */
#ifdef CONFIG_PPC32
mfspr r5,SPRN_SPRG_THREAD /* current task's THREAD (phys) */
-#ifdef CONFIG_VMAP_STACK
tovirt(r5, r5)
-#endif
lwz r4,THREAD_FPEXC_MODE(r5)
ori r9,r9,MSR_FP /* enable FP for current */
or r9,r9,r4
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index 48c0096fecc1..5ba4c6391107 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -19,7 +19,6 @@
.macro EXCEPTION_PROLOG_0 handle_dar_dsisr=0
mtspr SPRN_SPRG_SCRATCH0,r10
mtspr SPRN_SPRG_SCRATCH1,r11
-#ifdef CONFIG_VMAP_STACK
mfspr r10, SPRN_SPRG_THREAD
.if \handle_dar_dsisr
#ifdef CONFIG_40x
@@ -37,17 +36,13 @@
.endif
mfspr r11, SPRN_SRR0
stw r11, SRR0(r10)
-#endif
mfspr r11, SPRN_SRR1 /* check whether user or kernel */
-#ifdef CONFIG_VMAP_STACK
stw r11, SRR1(r10)
-#endif
mfcr r10
andi. r11, r11, MSR_PR
.endm

-.macro EXCEPTION_PROLOG_1 for_rtas=0
-#ifdef CONFIG_VMAP_STACK
+.macro EXCEPTION_PROLOG_1
mtspr SPRN_SPRG_SCRATCH2,r1
subi r1, r1, INT_FRAME_SIZE /* use r1 if kernel */
beq 1f
@@ -55,20 +50,13 @@
lwz r1,TASK_STACK-THREAD(r1)
addi r1, r1, THREAD_SIZE - INT_FRAME_SIZE
1:
+#ifdef CONFIG_VMAP_STACK
mtcrf 0x3f, r1
bt 32 - THREAD_ALIGN_SHIFT, stack_overflow
-#else
- subi r11, r1, INT_FRAME_SIZE /* use r1 if kernel */
- beq 1f
- mfspr r11,SPRN_SPRG_THREAD
- lwz r11,TASK_STACK-THREAD(r11)
- addi r11, r11, THREAD_SIZE - INT_FRAME_SIZE
-1: tophys(r11, r11)
#endif
.endm

.macro EXCEPTION_PROLOG_2 handle_dar_dsisr=0
-#ifdef CONFIG_VMAP_STACK
LOAD_REG_IMMEDIATE(r11, MSR_KERNEL & ~(MSR_IR | MSR_RI)) /* can take DTLB miss */
mtmsr r11
isync
@@ -76,11 +64,6 @@
stw r11,GPR1(r1)
stw r11,0(r1)
mr r11, r1
-#else
- stw r1,GPR1(r11)
- stw r1,0(r11)
- tovirt(r1, r11) /* set new kernel sp */
-#endif
stw r10,_CCR(r11) /* save registers */
stw r12,GPR12(r11)
stw r9,GPR9(r11)
@@ -90,7 +73,6 @@
stw r12,GPR11(r11)
mflr r10
stw r10,_LINK(r11)
-#ifdef CONFIG_VMAP_STACK
mfspr r12, SPRN_SPRG_THREAD
tovirt(r12, r12)
.if \handle_dar_dsisr
@@ -101,18 +83,10 @@
.endif
lwz r9, SRR1(r12)
lwz r12, SRR0(r12)
-#else
- mfspr r12,SPRN_SRR0
- mfspr r9,SPRN_SRR1
-#endif
#ifdef CONFIG_40x
rlwinm r9,r9,0,14,12 /* clear MSR_WE (necessary?) */
#else
-#ifdef CONFIG_VMAP_STACK
li r10, MSR_KERNEL & ~MSR_IR /* can take exceptions */
-#else
- li r10,MSR_KERNEL & ~(MSR_IR|MSR_DR) /* can take exceptions */
-#endif
mtmsr r10 /* (except for mach check in rtas) */
#endif
stw r0,GPR0(r11)
@@ -126,7 +100,6 @@
.macro SYSCALL_ENTRY trapno
mfspr r12,SPRN_SPRG_THREAD
mfspr r9, SPRN_SRR1
-#ifdef CONFIG_VMAP_STACK
mfspr r11, SPRN_SRR0
mtctr r11
andi. r11, r9, MSR_PR
@@ -141,23 +114,9 @@
stw r11,GPR1(r1)
stw r11,0(r1)
mr r11, r1
-#else
- andi. r11, r9, MSR_PR
- lwz r11,TASK_STACK-THREAD(r12)
- beq- 99f
- addi r11, r11, THREAD_SIZE - INT_FRAME_SIZE
- tophys(r11, r11)
- stw r1,GPR1(r11)
- stw r1,0(r11)
- tovirt(r1, r11) /* set new kernel sp */
-#endif
mflr r10
stw r10, _LINK(r11)
-#ifdef CONFIG_VMAP_STACK
mfctr r10
-#else
- mfspr r10,SPRN_SRR0
-#endif
stw r10,_NIP(r11)
mfcr r10
rlwinm r10,r10,0,4,2 /* Clear SO bit in CR */
@@ -165,11 +124,7 @@
#ifdef CONFIG_40x
rlwinm r9,r9,0,14,12 /* clear MSR_WE (necessary?) */
#else
-#ifdef CONFIG_VMAP_STACK
LOAD_REG_IMMEDIATE(r10, MSR_KERNEL & ~MSR_IR) /* can take exceptions */
-#else
- LOAD_REG_IMMEDIATE(r10, MSR_KERNEL & ~(MSR_IR|MSR_DR)) /* can take exceptions */
-#endif
mtmsr r10 /* (except for mach check in rtas) */
#endif
lis r10,STACK_FRAME_REGS_MARKER@ha /* exception frame marker */
@@ -198,7 +153,6 @@
li r12,-1 /* clear all pending debug events */
mtspr SPRN_DBSR,r12
lis r11,global_dbcr0@ha
- tophys_novmstack(r11,r11)
addi r11,r11,global_dbcr0@l
lwz r12,0(r11)
mtspr SPRN_DBCR0,r12
@@ -208,7 +162,6 @@
#endif

3:
- tovirt_novmstack r2, r2 /* set r2 to current */
lis r11, transfer_to_syscall@h
ori r11, r11, transfer_to_syscall@l
#ifdef CONFIG_TRACE_IRQFLAGS
@@ -234,59 +187,6 @@
99: b ret_from_kernel_syscall
.endm

-.macro save_dar_dsisr_on_stack reg1, reg2, sp
-#ifndef CONFIG_VMAP_STACK
-#ifdef CONFIG_40x
- mfspr \reg1, SPRN_DEAR
- mfspr \reg2, SPRN_ESR
-#else
- mfspr \reg1, SPRN_DAR
- mfspr \reg2, SPRN_DSISR
-#endif
- stw \reg1, _DAR(\sp)
- stw \reg2, _DSISR(\sp)
-#endif
-.endm
-
-.macro get_and_save_dar_dsisr_on_stack reg1, reg2, sp
-#ifdef CONFIG_VMAP_STACK
- lwz \reg1, _DAR(\sp)
- lwz \reg2, _DSISR(\sp)
-#else
- save_dar_dsisr_on_stack \reg1, \reg2, \sp
-#endif
-.endm
-
-.macro tovirt_vmstack dst, src
-#ifdef CONFIG_VMAP_STACK
- tovirt(\dst, \src)
-#else
- .ifnc \dst, \src
- mr \dst, \src
- .endif
-#endif
-.endm
-
-.macro tovirt_novmstack dst, src
-#ifndef CONFIG_VMAP_STACK
- tovirt(\dst, \src)
-#else
- .ifnc \dst, \src
- mr \dst, \src
- .endif
-#endif
-.endm
-
-.macro tophys_novmstack dst, src
-#ifndef CONFIG_VMAP_STACK
- tophys(\dst, \src)
-#else
- .ifnc \dst, \src
- mr \dst, \src
- .endif
-#endif
-.endm
-
/*
* Note: code which follows this uses cr0.eq (set if from kernel),
* r11, r12 (SRR0), and r9 (SRR1).
@@ -334,7 +234,6 @@
ret_from_except)

.macro vmap_stack_overflow_exception
-#ifdef CONFIG_VMAP_STACK
#ifdef CONFIG_SMP
mfspr r1, SPRN_SPRG_THREAD
lwz r1, TASK_CPU - THREAD(r1)
@@ -353,7 +252,6 @@
SAVE_NVGPRS(r11)
addi r3, r1, STACK_FRAME_OVERHEAD
EXC_XFER_STD(0, stack_overflow_exception)
-#endif
.endm

#endif /* __HEAD_32_H__ */
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index ef0bdc20849f..6b23cbd7f9c5 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -89,14 +89,12 @@ _ENTRY(crit_srr0)
.space 4
_ENTRY(crit_srr1)
.space 4
-#ifdef CONFIG_VMAP_STACK
_ENTRY(crit_r1)
.space 4
_ENTRY(crit_dear)
.space 4
_ENTRY(crit_esr)
.space 4
-#endif
_ENTRY(saved_ksp_limit)
.space 4

@@ -115,12 +113,10 @@ _ENTRY(saved_ksp_limit)
mfspr r11,SPRN_SRR1
stw r10,crit_srr0@l(0)
stw r11,crit_srr1@l(0)
-#ifdef CONFIG_VMAP_STACK
mfspr r10,SPRN_DEAR
mfspr r11,SPRN_ESR
stw r10,crit_dear@l(0)
stw r11,crit_esr@l(0)
-#endif
mfcr r10 /* save CR in r10 for now */
mfspr r11,SPRN_SRR3 /* check whether user or kernel */
andi. r11,r11,MSR_PR
@@ -130,7 +126,6 @@ _ENTRY(saved_ksp_limit)
/* COMING FROM USER MODE */
mfspr r11,SPRN_SPRG_THREAD /* if from user, start at top of */
lwz r11,TASK_STACK-THREAD(r11) /* this thread's kernel stack */
-#ifdef CONFIG_VMAP_STACK
1: stw r1,crit_r1@l(0)
addi r1,r11,THREAD_SIZE-INT_FRAME_SIZE /* Alloc an excpt frm */
LOAD_REG_IMMEDIATE(r11,MSR_KERNEL & ~(MSR_IR | MSR_RI))
@@ -140,35 +135,18 @@ _ENTRY(saved_ksp_limit)
stw r11,GPR1(r1)
stw r11,0(r1)
mr r11,r1
-#else
-1: addi r11,r11,THREAD_SIZE-INT_FRAME_SIZE /* Alloc an excpt frm */
- tophys(r11,r11)
- stw r1,GPR1(r11)
- stw r1,0(r11)
- tovirt(r1,r11)
-#endif
stw r10,_CCR(r11) /* save various registers */
stw r12,GPR12(r11)
stw r9,GPR9(r11)
mflr r10
stw r10,_LINK(r11)
-#ifdef CONFIG_VMAP_STACK
lis r9,PAGE_OFFSET@ha
lwz r10,crit_r10@l(r9)
lwz r12,crit_r11@l(r9)
-#else
- lwz r10,crit_r10@l(0)
- lwz r12,crit_r11@l(0)
-#endif
stw r10,GPR10(r11)
stw r12,GPR11(r11)
-#ifdef CONFIG_VMAP_STACK
lwz r12,crit_dear@l(r9)
lwz r9,crit_esr@l(r9)
-#else
- mfspr r12,SPRN_DEAR /* save DEAR and ESR in the frame */
- mfspr r9,SPRN_ESR /* in them at the point where the */
-#endif
stw r12,_DEAR(r11) /* since they may have had stuff */
stw r9,_ESR(r11) /* exception was taken */
mfspr r12,SPRN_SRR2
@@ -224,7 +202,6 @@ _ENTRY(saved_ksp_limit)
*/
START_EXCEPTION(0x0300, DataStorage)
EXCEPTION_PROLOG handle_dar_dsisr=1
- save_dar_dsisr_on_stack r4, r5, r11
EXC_XFER_LITE(0x300, handle_page_fault)

/*
@@ -244,14 +221,12 @@ _ENTRY(saved_ksp_limit)
/* 0x0600 - Alignment Exception */
START_EXCEPTION(0x0600, Alignment)
EXCEPTION_PROLOG handle_dar_dsisr=1
- save_dar_dsisr_on_stack r4, r5, r11
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0x600, alignment_exception)

/* 0x0700 - Program Exception */
START_EXCEPTION(0x0700, ProgramCheck)
EXCEPTION_PROLOG handle_dar_dsisr=1
- save_dar_dsisr_on_stack r4, r5, r11
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0x700, program_check_exception)

diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 7869db974185..78c76e5cb46c 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -124,7 +124,6 @@ instruction_counter:
. = 0x200
MachineCheck:
EXCEPTION_PROLOG handle_dar_dsisr=1
- save_dar_dsisr_on_stack r4, r5, r11
li r6, RPN_PATTERN
mtspr SPRN_DAR, r6 /* Tag DAR, to be used in DTLB Error */
addi r3,r1,STACK_FRAME_OVERHEAD
@@ -137,7 +136,6 @@ MachineCheck:
. = 0x600
Alignment:
EXCEPTION_PROLOG handle_dar_dsisr=1
- save_dar_dsisr_on_stack r4, r5, r11
li r6, RPN_PATTERN
mtspr SPRN_DAR, r6 /* Tag DAR, to be used in DTLB Error */
addi r3,r1,STACK_FRAME_OVERHEAD
@@ -333,21 +331,16 @@ DataTLBError:
cmpwi cr1, r11, RPN_PATTERN
beq- cr1, FixupDAR /* must be a buggy dcbX, icbi insn. */
DARFixed:/* Return from dcbx instruction bug workaround */
-#ifdef CONFIG_VMAP_STACK
li r11, RPN_PATTERN
mtspr SPRN_DAR, r11 /* Tag DAR, to be used in DTLB Error */
-#endif
EXCEPTION_PROLOG_1
EXCEPTION_PROLOG_2 handle_dar_dsisr=1
- get_and_save_dar_dsisr_on_stack r4, r5, r11
+ lwz r4, _DAR(r11)
+ lwz r5, _DSISR(r11)
andis. r10,r5,DSISR_NOHPTE@h
beq+ .Ldtlbie
tlbie r4
.Ldtlbie:
-#ifndef CONFIG_VMAP_STACK
- li r10,RPN_PATTERN
- mtspr SPRN_DAR,r10 /* Tag DAR, to be used in DTLB Error */
-#endif
/* 0x300 is DataAccess exception, needed by bad_page_fault() */
EXC_XFER_LITE(0x300, handle_page_fault)

@@ -364,10 +357,6 @@ do_databreakpoint:
addi r3,r1,STACK_FRAME_OVERHEAD
mfspr r4,SPRN_BAR
stw r4,_DAR(r11)
-#ifndef CONFIG_VMAP_STACK
- mfspr r5,SPRN_DSISR
- stw r5,_DSISR(r11)
-#endif
EXC_XFER_STD(0x1c00, do_break)

. = 0x1c00
@@ -510,14 +499,10 @@ FixupDAR:/* Entry point for dcbx workaround. */
152:
mfdar r11
mtctr r11 /* restore ctr reg from DAR */
-#ifdef CONFIG_VMAP_STACK
mfspr r11, SPRN_SPRG_THREAD
stw r10, DAR(r11)
mfspr r10, SPRN_DSISR
stw r10, DSISR(r11)
-#else
- mtdar r10 /* save fault EA to DAR */
-#endif
mfspr r10,SPRN_M_TW
b DARFixed /* Go back to normal TLB handling */

diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S
index 6543cb410a8d..bec57305225d 100644
--- a/arch/powerpc/kernel/head_book3s_32.S
+++ b/arch/powerpc/kernel/head_book3s_32.S
@@ -288,7 +288,6 @@ MachineCheck:
. = 0x300
DO_KVM 0x300
DataAccess:
-#ifdef CONFIG_VMAP_STACK
#ifdef CONFIG_PPC_BOOK3S_604
BEGIN_MMU_FTR_SECTION
mtspr SPRN_SPRG_SCRATCH2,r10
@@ -310,29 +309,11 @@ ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_HPTE_TABLE)
1: EXCEPTION_PROLOG_0 handle_dar_dsisr=1
EXCEPTION_PROLOG_1
b handle_page_fault_tramp_1
-#else /* CONFIG_VMAP_STACK */
- EXCEPTION_PROLOG handle_dar_dsisr=1
- get_and_save_dar_dsisr_on_stack r4, r5, r11
-#ifdef CONFIG_PPC_BOOK3S_604
-BEGIN_MMU_FTR_SECTION
- andis. r0, r5, (DSISR_BAD_FAULT_32S | DSISR_DABRMATCH)@h
- bne handle_page_fault_tramp_2 /* if not, try to put a PTE */
- rlwinm r3, r5, 32 - 15, 21, 21 /* DSISR_STORE -> _PAGE_RW */
- bl hash_page
- b handle_page_fault_tramp_1
-MMU_FTR_SECTION_ELSE
-#endif
- b handle_page_fault_tramp_2
-#ifdef CONFIG_PPC_BOOK3S_604
-ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_HPTE_TABLE)
-#endif
-#endif /* CONFIG_VMAP_STACK */

/* Instruction access exception. */
. = 0x400
DO_KVM 0x400
InstructionAccess:
-#ifdef CONFIG_VMAP_STACK
mtspr SPRN_SPRG_SCRATCH0,r10
mtspr SPRN_SPRG_SCRATCH1,r11
mfspr r10, SPRN_SPRG_THREAD
@@ -353,18 +334,6 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)

EXCEPTION_PROLOG_1
EXCEPTION_PROLOG_2
-#else /* CONFIG_VMAP_STACK */
- EXCEPTION_PROLOG
- andis. r0,r9,SRR1_ISI_NOPT@h /* no pte found? */
- beq 1f /* if so, try to put a PTE */
- li r3,0 /* into the hash table */
- mr r4,r12 /* SRR0 is fault address */
-#ifdef CONFIG_PPC_BOOK3S_604
-BEGIN_MMU_FTR_SECTION
- bl hash_page
-END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
-#endif
-#endif /* CONFIG_VMAP_STACK */
andis. r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */
stw r5, _DSISR(r11)
stw r12, _DAR(r11)
@@ -378,7 +347,6 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
DO_KVM 0x600
Alignment:
EXCEPTION_PROLOG handle_dar_dsisr=1
- save_dar_dsisr_on_stack r4, r5, r11
addi r3,r1,STACK_FRAME_OVERHEAD
b alignment_exception_tramp

@@ -686,18 +654,13 @@ alignment_exception_tramp:
EXC_XFER_STD(0x600, alignment_exception)

handle_page_fault_tramp_1:
-#ifdef CONFIG_VMAP_STACK
EXCEPTION_PROLOG_2 handle_dar_dsisr=1
-#endif
lwz r5, _DSISR(r11)
- /* fall through */
-handle_page_fault_tramp_2:
andis. r0, r5, DSISR_DABRMATCH@h
bne- 1f
EXC_XFER_LITE(0x300, handle_page_fault)
1: EXC_XFER_STD(0x300, do_break)

-#ifdef CONFIG_VMAP_STACK
#ifdef CONFIG_PPC_BOOK3S_604
.macro save_regs_thread thread
stw r0, THR0(\thread)
@@ -772,6 +735,7 @@ fast_hash_page_return:
rfi
#endif /* CONFIG_PPC_BOOK3S_604 */

+#ifdef CONFIG_VMAP_STACK
stack_overflow:
vmap_stack_overflow_exception
#endif
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index 0fbdacc7fab7..5d0402c48ebc 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -144,7 +144,6 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
li r12,-1 /* clear all pending debug events */
mtspr SPRN_DBSR,r12
lis r11,global_dbcr0@ha
- tophys(r11,r11)
addi r11,r11,global_dbcr0@l
#ifdef CONFIG_SMP
lwz r10, TASK_CPU(r2)
@@ -158,7 +157,6 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
stw r12,4(r11)

3:
- tovirt(r2, r2) /* set r2 to current */
lis r11, transfer_to_syscall@h
ori r11, r11, transfer_to_syscall@l
#ifdef CONFIG_TRACE_IRQFLAGS
diff --git a/arch/powerpc/kernel/idle_6xx.S b/arch/powerpc/kernel/idle_6xx.S
index 69df840f7253..153366e178c4 100644
--- a/arch/powerpc/kernel/idle_6xx.S
+++ b/arch/powerpc/kernel/idle_6xx.S
@@ -145,9 +145,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)

/*
* Return from NAP/DOZE mode, restore some CPU specific registers,
- * we are called with DR/IR still off and r2 containing physical
- * address of current. R11 points to the exception frame (physical
- * address). We have to preserve r10.
+ * R11 points to the exception frame. We have to preserve r10.
*/
_GLOBAL(power_save_ppc32_restore)
lwz r9,_LINK(r11) /* interrupted in ppc6xx_idle: */
@@ -166,11 +164,7 @@ BEGIN_FTR_SECTION
mfspr r9,SPRN_HID0
andis. r9,r9,HID0_NAP@h
beq 1f
-#ifdef CONFIG_VMAP_STACK
addis r9, r11, nap_save_msscr0@ha
-#else
- addis r9,r11,(nap_save_msscr0-KERNELBASE)@ha
-#endif
lwz r9,nap_save_msscr0@l(r9)
mtspr SPRN_MSSCR0, r9
sync
@@ -178,11 +172,7 @@ BEGIN_FTR_SECTION
1:
END_FTR_SECTION_IFSET(CPU_FTR_NAP_DISABLE_L2_PR)
BEGIN_FTR_SECTION
-#ifdef CONFIG_VMAP_STACK
addis r9, r11, nap_save_hid1@ha
-#else
- addis r9,r11,(nap_save_hid1-KERNELBASE)@ha
-#endif
lwz r9,nap_save_hid1@l(r9)
mtspr SPRN_HID1, r9
END_FTR_SECTION_IFSET(CPU_FTR_DUAL_PLL_750FX)
diff --git a/arch/powerpc/kernel/idle_e500.S b/arch/powerpc/kernel/idle_e500.S
index 72c85b6f3898..7795727e7f08 100644
--- a/arch/powerpc/kernel/idle_e500.S
+++ b/arch/powerpc/kernel/idle_e500.S
@@ -74,8 +74,8 @@ END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)

/*
* Return from NAP/DOZE mode, restore some CPU specific registers,
- * r2 containing physical address of current.
- * r11 points to the exception frame (physical address).
+ * r2 containing address of current.
+ * r11 points to the exception frame.
* We have to preserve r10.
*/
_GLOBAL(power_save_ppc32_restore)
diff --git a/arch/powerpc/kernel/vector.S b/arch/powerpc/kernel/vector.S
index 801dc28fdcca..f5a52f444e36 100644
--- a/arch/powerpc/kernel/vector.S
+++ b/arch/powerpc/kernel/vector.S
@@ -67,9 +67,7 @@ _GLOBAL(load_up_altivec)
#ifdef CONFIG_PPC32
mfspr r5,SPRN_SPRG_THREAD /* current task's THREAD (phys) */
oris r9,r9,MSR_VEC@h
-#ifdef CONFIG_VMAP_STACK
tovirt(r5, r5)
-#endif
#else
ld r4,PACACURRENT(r13)
addi r5,r4,THREAD /* Get THREAD */
diff --git a/arch/powerpc/mm/book3s32/hash_low.S b/arch/powerpc/mm/book3s32/hash_low.S
index 0e6dc830c38b..fb4233a5bdf7 100644
--- a/arch/powerpc/mm/book3s32/hash_low.S
+++ b/arch/powerpc/mm/book3s32/hash_low.S
@@ -140,10 +140,6 @@ _GLOBAL(hash_page)
bne- .Lretry /* retry if someone got there first */

mfsrin r3,r4 /* get segment reg for segment */
-#ifndef CONFIG_VMAP_STACK
- mfctr r0
- stw r0,_CTR(r11)
-#endif
bl create_hpte /* add the hash table entry */

#ifdef CONFIG_SMP
@@ -152,17 +148,7 @@ _GLOBAL(hash_page)
li r0,0
stw r0, (mmu_hash_lock - PAGE_OFFSET)@l(r8)
#endif
-
-#ifdef CONFIG_VMAP_STACK
b fast_hash_page_return
-#else
- /* Return from the exception */
- lwz r5,_CTR(r11)
- mtctr r5
- lwz r0,GPR0(r11)
- lwz r8,GPR8(r11)
- b fast_exception_return
-#endif

#ifdef CONFIG_SMP
.Lhash_page_out:
--
2.25.0