347 lines
7.7 KiB
C
347 lines
7.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __HEAD_32_H__
|
|
#define __HEAD_32_H__
|
|
|
|
#include <asm/ptrace.h> /* for STACK_FRAME_REGS_MARKER */
|
|
|
|
/*
|
|
* Exception entry code. This code runs with address translation
|
|
* turned off, i.e. using physical addresses.
|
|
* We assume sprg3 has the physical address of the current
|
|
* task's thread_struct.
|
|
*/
|
|
.macro EXCEPTION_PROLOG handle_dar_dsisr=0
|
|
EXCEPTION_PROLOG_0 handle_dar_dsisr=\handle_dar_dsisr
|
|
EXCEPTION_PROLOG_1
|
|
EXCEPTION_PROLOG_2 handle_dar_dsisr=\handle_dar_dsisr
|
|
.endm
|
|
|
|
.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
|
|
mfspr r11, SPRN_DAR
|
|
stw r11, DAR(r10)
|
|
mfspr r11, SPRN_DSISR
|
|
stw r11, DSISR(r10)
|
|
.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
|
|
mr r11, r1
|
|
subi r1, r1, INT_FRAME_SIZE /* use r1 if kernel */
|
|
beq 1f
|
|
mfspr r1,SPRN_SPRG_THREAD
|
|
lwz r1,TASK_STACK-THREAD(r1)
|
|
addi r1, r1, THREAD_SIZE - INT_FRAME_SIZE
|
|
#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
|
|
#endif
|
|
1:
|
|
tophys_novmstack r11, r11
|
|
#ifdef CONFIG_VMAP_STACK
|
|
mtcrf 0x7f, r1
|
|
bt 32 - THREAD_ALIGN_SHIFT, stack_overflow
|
|
#endif
|
|
.endm
|
|
|
|
.macro EXCEPTION_PROLOG_2 handle_dar_dsisr=0
|
|
#ifdef CONFIG_VMAP_STACK
|
|
mtcr r10
|
|
li r10, MSR_KERNEL & ~(MSR_IR | MSR_RI) /* can take DTLB miss */
|
|
mtmsr r10
|
|
isync
|
|
#else
|
|
stw r10,_CCR(r11) /* save registers */
|
|
#endif
|
|
mfspr r10, SPRN_SPRG_SCRATCH0
|
|
#ifdef CONFIG_VMAP_STACK
|
|
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 r12,GPR12(r11)
|
|
stw r9,GPR9(r11)
|
|
stw r10,GPR10(r11)
|
|
#ifdef CONFIG_VMAP_STACK
|
|
mfcr r10
|
|
stw r10, _CCR(r11)
|
|
#endif
|
|
mfspr r12,SPRN_SPRG_SCRATCH1
|
|
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
|
|
lwz r10, DAR(r12)
|
|
stw r10, _DAR(r11)
|
|
lwz r10, DSISR(r12)
|
|
stw r10, _DSISR(r11)
|
|
.endif
|
|
lwz r9, SRR1(r12)
|
|
andi. r10, r9, MSR_PR
|
|
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)
|
|
lis r10,STACK_FRAME_REGS_MARKER@ha /* exception frame marker */
|
|
addi r10,r10,STACK_FRAME_REGS_MARKER@l
|
|
stw r10,8(r11)
|
|
SAVE_4GPRS(3, r11)
|
|
SAVE_2GPRS(7, r11)
|
|
.endm
|
|
|
|
.macro SYSCALL_ENTRY trapno
|
|
mfspr r12,SPRN_SPRG_THREAD
|
|
mfspr r9, SPRN_SRR1
|
|
#ifdef CONFIG_VMAP_STACK
|
|
mfspr r11, SPRN_SRR0
|
|
mtctr r11
|
|
#endif
|
|
andi. r11, r9, MSR_PR
|
|
lwz r11,TASK_STACK-THREAD(r12)
|
|
beq- 99f
|
|
addi r11, r11, THREAD_SIZE - INT_FRAME_SIZE
|
|
#ifdef CONFIG_VMAP_STACK
|
|
li r10, MSR_KERNEL & ~(MSR_IR | MSR_RI) /* can take DTLB miss */
|
|
mtmsr r10
|
|
isync
|
|
#endif
|
|
tovirt_vmstack r12, r12
|
|
tophys_novmstack r11, r11
|
|
mflr r10
|
|
stw r10, _LINK(r11)
|
|
#ifdef CONFIG_VMAP_STACK
|
|
mfctr r10
|
|
#else
|
|
mfspr r10,SPRN_SRR0
|
|
#endif
|
|
stw r1,GPR1(r11)
|
|
stw r1,0(r11)
|
|
tovirt_novmstack r1, r11 /* set new kernel sp */
|
|
stw r10,_NIP(r11)
|
|
mfcr r10
|
|
rlwinm r10,r10,0,4,2 /* Clear SO bit in CR */
|
|
stw r10,_CCR(r11) /* save registers */
|
|
#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 */
|
|
stw r2,GPR2(r11)
|
|
addi r10,r10,STACK_FRAME_REGS_MARKER@l
|
|
stw r9,_MSR(r11)
|
|
li r2, \trapno + 1
|
|
stw r10,8(r11)
|
|
stw r2,_TRAP(r11)
|
|
SAVE_GPR(0, r11)
|
|
SAVE_4GPRS(3, r11)
|
|
SAVE_2GPRS(7, r11)
|
|
addi r11,r1,STACK_FRAME_OVERHEAD
|
|
addi r2,r12,-THREAD
|
|
stw r11,PT_REGS(r12)
|
|
#if defined(CONFIG_40x)
|
|
/* Check to see if the dbcr0 register is set up to debug. Use the
|
|
internal debug mode bit to do this. */
|
|
lwz r12,THREAD_DBCR0(r12)
|
|
andis. r12,r12,DBCR0_IDM@h
|
|
#endif
|
|
ACCOUNT_CPU_USER_ENTRY(r2, r11, r12)
|
|
#if defined(CONFIG_40x)
|
|
beq+ 3f
|
|
/* From user and task is ptraced - load up global dbcr0 */
|
|
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
|
|
lwz r12,0(r11)
|
|
mtspr SPRN_DBCR0,r12
|
|
lwz r12,4(r11)
|
|
addi r12,r12,-1
|
|
stw r12,4(r11)
|
|
#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
|
|
/*
|
|
* If MSR is changing we need to keep interrupts disabled at this point
|
|
* otherwise we might risk taking an interrupt before we tell lockdep
|
|
* they are enabled.
|
|
*/
|
|
LOAD_REG_IMMEDIATE(r10, MSR_KERNEL)
|
|
rlwimi r10, r9, 0, MSR_EE
|
|
#else
|
|
LOAD_REG_IMMEDIATE(r10, MSR_KERNEL | MSR_EE)
|
|
#endif
|
|
#if defined(CONFIG_PPC_8xx) && defined(CONFIG_PERF_EVENTS)
|
|
mtspr SPRN_NRI, r0
|
|
#endif
|
|
mtspr SPRN_SRR1,r10
|
|
mtspr SPRN_SRR0,r11
|
|
RFI /* jump to handler, enable MMU */
|
|
99: b ret_from_kernel_syscall
|
|
.endm
|
|
|
|
.macro save_dar_dsisr_on_stack reg1, reg2, sp
|
|
#ifndef CONFIG_VMAP_STACK
|
|
mfspr \reg1, SPRN_DAR
|
|
mfspr \reg2, SPRN_DSISR
|
|
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).
|
|
*
|
|
* Note2: once we have set r1 we are in a position to take exceptions
|
|
* again, and we could thus set MSR:RI at that point.
|
|
*/
|
|
|
|
/*
|
|
* Exception vectors.
|
|
*/
|
|
#ifdef CONFIG_PPC_BOOK3S
|
|
#define START_EXCEPTION(n, label) \
|
|
. = n; \
|
|
DO_KVM n; \
|
|
label:
|
|
|
|
#else
|
|
#define START_EXCEPTION(n, label) \
|
|
. = n; \
|
|
label:
|
|
|
|
#endif
|
|
|
|
#define EXCEPTION(n, label, hdlr, xfer) \
|
|
START_EXCEPTION(n, label) \
|
|
EXCEPTION_PROLOG; \
|
|
addi r3,r1,STACK_FRAME_OVERHEAD; \
|
|
xfer(n, hdlr)
|
|
|
|
#define EXC_XFER_TEMPLATE(hdlr, trap, msr, tfer, ret) \
|
|
li r10,trap; \
|
|
stw r10,_TRAP(r11); \
|
|
LOAD_REG_IMMEDIATE(r10, msr); \
|
|
bl tfer; \
|
|
.long hdlr; \
|
|
.long ret
|
|
|
|
#define EXC_XFER_STD(n, hdlr) \
|
|
EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, transfer_to_handler_full, \
|
|
ret_from_except_full)
|
|
|
|
#define EXC_XFER_LITE(n, hdlr) \
|
|
EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, transfer_to_handler, \
|
|
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)
|
|
slwi r1, r1, 3
|
|
addis r1, r1, emergency_ctx@ha
|
|
#else
|
|
lis r1, emergency_ctx@ha
|
|
#endif
|
|
lwz r1, emergency_ctx@l(r1)
|
|
cmpwi cr1, r1, 0
|
|
bne cr1, 1f
|
|
lis r1, init_thread_union@ha
|
|
addi r1, r1, init_thread_union@l
|
|
1: addi r1, r1, THREAD_SIZE - INT_FRAME_SIZE
|
|
EXCEPTION_PROLOG_2
|
|
SAVE_NVGPRS(r11)
|
|
addi r3, r1, STACK_FRAME_OVERHEAD
|
|
EXC_XFER_STD(0, stack_overflow_exception)
|
|
#endif
|
|
.endm
|
|
|
|
#endif /* __HEAD_32_H__ */
|