[PATCH 08/17] riscv: abstract out CSR names for supervisor vs machine mode

From: Christoph Hellwig
Date: Mon Jun 10 2019 - 18:21:17 EST

Many of the privileged CSRs exist in a supervisor and machine version
that are used very similarly. Provide a new X-naming layer so that
we don't have to ifdef everywhere for M-mode Linux support.

Contains contributions from Damien Le Moal <Damien.LeMoal@xxxxxxx>.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
arch/riscv/Kconfig | 4 ++
arch/riscv/include/asm/asm.h | 6 +++
arch/riscv/include/asm/csr.h | 58 ++++++++++++++++++++++++++--
arch/riscv/include/asm/irqflags.h | 12 +++---
arch/riscv/include/asm/processor.h | 2 +-
arch/riscv/include/asm/ptrace.h | 16 ++++----
arch/riscv/include/asm/switch_to.h | 8 ++--
arch/riscv/kernel/asm-offsets.c | 8 ++--
arch/riscv/kernel/entry.S | 62 ++++++++++++++++--------------
arch/riscv/kernel/fpu.S | 8 ++--
arch/riscv/kernel/head.S | 16 ++++----
arch/riscv/kernel/irq.c | 4 +-
arch/riscv/kernel/process.c | 15 ++++----
arch/riscv/kernel/signal.c | 21 +++++-----
arch/riscv/kernel/traps.c | 16 ++++----
arch/riscv/lib/uaccess.S | 12 +++---
arch/riscv/mm/extable.c | 4 +-
arch/riscv/mm/fault.c | 6 +--
drivers/clocksource/timer-riscv.c | 8 ++--
drivers/irqchip/irq-sifive-plic.c | 4 +-
20 files changed, 179 insertions(+), 111 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 2e3b60cdeef4..9f2ebd035e80 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -53,6 +53,10 @@ config RISCV
select ARCH_HAS_MMIOWB
select HAVE_EBPF_JIT if 64BIT

+# set if we run in machine mode, cleared if we run in supervisor mode
+config M_MODE
+ bool
+
config MMU
def_bool y

diff --git a/arch/riscv/include/asm/asm.h b/arch/riscv/include/asm/asm.h
index 5a02b7d50940..14604f01e9f8 100644
--- a/arch/riscv/include/asm/asm.h
+++ b/arch/riscv/include/asm/asm.h
@@ -65,4 +65,10 @@
#error "Unexpected __SIZEOF_SHORT__"
#endif

+#ifdef CONFIG_M_MODE
+# define Xret mret
+#else
+# define Xret sret
+#endif
+
#endif /* _ASM_RISCV_ASM_H */
diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h
index a18923fa23c8..026a761835b7 100644
--- a/arch/riscv/include/asm/csr.h
+++ b/arch/riscv/include/asm/csr.h
@@ -11,8 +11,11 @@

/* Status register flags */
#define SR_SIE _AC(0x00000002, UL) /* Supervisor Interrupt Enable */
+#define SR_MIE _AC(0x00000008, UL) /* Machine Interrupt Enable */
#define SR_SPIE _AC(0x00000020, UL) /* Previous Supervisor IE */
+#define SR_MPIE _AC(0x00000080, UL) /* Previous Machine IE */
#define SR_SPP _AC(0x00000100, UL) /* Previously Supervisor */
+#define SR_MPP _AC(0x00001800, UL) /* Previously Machine */
#define SR_SUM _AC(0x00040000, UL) /* Supervisor User Memory Access */

#define SR_FS _AC(0x00006000, UL) /* Floating-point Status */
@@ -44,8 +47,8 @@
#define SATP_MODE SATP_MODE_39
#endif

-/* SCAUSE */
-#define SCAUSE_IRQ_FLAG (_AC(1, UL) << (__riscv_xlen - 1))
+/* *CAUSE */
+#define XCAUSE_IRQ_FLAG (_AC(1, UL) << (__riscv_xlen - 1))

#define IRQ_U_SOFT 0
#define IRQ_S_SOFT 1
@@ -67,11 +70,26 @@
#define EXC_LOAD_PAGE_FAULT 13
#define EXC_STORE_PAGE_FAULT 15

-/* SIE (Interrupt Enable) and SIP (Interrupt Pending) flags */
+/* MIE / MIP flags: */
+#define MIE_MSIE (_AC(0x1, UL) << IRQ_M_SOFT)
+#define MIE_MTIE (_AC(0x1, UL) << IRQ_M_TIMER)
+#define MIE_MEIE (_AC(0x1, UL) << IRQ_M_EXT)
+
+/* SIE / SIP flags: */
#define SIE_SSIE (_AC(0x1, UL) << IRQ_S_SOFT)
#define SIE_STIE (_AC(0x1, UL) << IRQ_S_TIMER)
#define SIE_SEIE (_AC(0x1, UL) << IRQ_S_EXT)

+/* symbolic CSR names: */
+#define CSR_MSTATUS 0x300
+#define CSR_MIE 0x304
+#define CSR_MTVEC 0x305
+#define CSR_MSCRATCH 0x340
+#define CSR_MEPC 0x341
+#define CSR_MCAUSE 0x342
+#define CSR_MTVAL 0x343
+#define CSR_MIP 0x344
+
#define CSR_CYCLE 0xc00
#define CSR_TIME 0xc01
#define CSR_INSTRET 0xc02
@@ -89,6 +107,40 @@
#define CSR_TIMEH 0xc81
#define CSR_INSTRETH 0xc82

+#ifdef CONFIG_M_MODE
+# define CSR_XSTATUS CSR_MSTATUS
+# define CSR_XIE CSR_MIE
+# define CSR_XTVEC CSR_MTVEC
+# define CSR_XSCRATCH CSR_MSCRATCH
+# define CSR_XEPC CSR_MEPC
+# define CSR_XCAUSE CSR_MCAUSE
+# define CSR_XTVAL CSR_MTVAL
+# define CSR_XIP CSR_MIP
+
+# define SR_XIE SR_MIE
+# define SR_XPIE SR_MPIE
+# define SR_XPP SR_MPP
+
+# define XIE_XTIE MIE_MTIE
+# define XIE_XEIE MIE_MEIE
+#else /* CONFIG_M_MODE */
+# define CSR_XSTATUS CSR_SSTATUS
+# define CSR_XIE CSR_SIE
+# define CSR_XTVEC CSR_STVEC
+# define CSR_XSCRATCH CSR_SSCRATCH
+# define CSR_XEPC CSR_SEPC
+# define CSR_XCAUSE CSR_SCAUSE
+# define CSR_XTVAL CSR_STVAL
+# define CSR_XIP CSR_SIP
+
+# define SR_XIE SR_SIE
+# define SR_XPIE SR_SPIE
+# define SR_XPP SR_SPP
+
+# define XIE_XTIE SIE_STIE
+# define XIE_XEIE SIE_SEIE
+#endif /* CONFIG_M_MODE */
+
#ifndef __ASSEMBLY__

#define csr_swap(csr, val) \
diff --git a/arch/riscv/include/asm/irqflags.h b/arch/riscv/include/asm/irqflags.h
index e70f647ce3b7..ba2828a37d72 100644
--- a/arch/riscv/include/asm/irqflags.h
+++ b/arch/riscv/include/asm/irqflags.h
@@ -13,31 +13,31 @@
/* read interrupt enabled status */
static inline unsigned long arch_local_save_flags(void)
{
- return csr_read(CSR_SSTATUS);
+ return csr_read(CSR_XSTATUS);
}

/* unconditionally enable interrupts */
static inline void arch_local_irq_enable(void)
{
- csr_set(CSR_SSTATUS, SR_SIE);
+ csr_set(CSR_XSTATUS, SR_XIE);
}

/* unconditionally disable interrupts */
static inline void arch_local_irq_disable(void)
{
- csr_clear(CSR_SSTATUS, SR_SIE);
+ csr_clear(CSR_XSTATUS, SR_XIE);
}

/* get status and disable interrupts */
static inline unsigned long arch_local_irq_save(void)
{
- return csr_read_clear(CSR_SSTATUS, SR_SIE);
+ return csr_read_clear(CSR_XSTATUS, SR_XIE);
}

/* test flags */
static inline int arch_irqs_disabled_flags(unsigned long flags)
{
- return !(flags & SR_SIE);
+ return !(flags & SR_XIE);
}

/* test hardware interrupt enable bit */
@@ -49,7 +49,7 @@ static inline int arch_irqs_disabled(void)
/* set interrupt enabled status */
static inline void arch_local_irq_restore(unsigned long flags)
{
- csr_set(CSR_SSTATUS, flags & SR_SIE);
+ csr_set(CSR_XSTATUS, flags & SR_XIE);
}

#endif /* _ASM_RISCV_IRQFLAGS_H */
diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
index f539149d04c2..46f825e34575 100644
--- a/arch/riscv/include/asm/processor.h
+++ b/arch/riscv/include/asm/processor.h
@@ -42,7 +42,7 @@ struct thread_struct {
((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE \
- ALIGN(sizeof(struct pt_regs), STACK_ALIGN)))

-#define KSTK_EIP(tsk) (task_pt_regs(tsk)->sepc)
+#define KSTK_EIP(tsk) (task_pt_regs(tsk)->xepc)
#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)


diff --git a/arch/riscv/include/asm/ptrace.h b/arch/riscv/include/asm/ptrace.h
index d48d1e13973c..7684d81d0e84 100644
--- a/arch/riscv/include/asm/ptrace.h
+++ b/arch/riscv/include/asm/ptrace.h
@@ -12,7 +12,7 @@
#ifndef __ASSEMBLY__

struct pt_regs {
- unsigned long sepc;
+ unsigned long xepc;
unsigned long ra;
unsigned long sp;
unsigned long gp;
@@ -44,10 +44,10 @@ struct pt_regs {
unsigned long t4;
unsigned long t5;
unsigned long t6;
- /* Supervisor CSRs */
- unsigned long sstatus;
- unsigned long sbadaddr;
- unsigned long scause;
+ /* Supervisor/Machine CSRs */
+ unsigned long xstatus;
+ unsigned long xbadaddr;
+ unsigned long xcause;
/* a0 value before the syscall */
unsigned long orig_a0;
};
@@ -58,18 +58,18 @@ struct pt_regs {
#define REG_FMT "%08lx"
#endif

-#define user_mode(regs) (((regs)->sstatus & SR_SPP) == 0)
+#define user_mode(regs) (((regs)->xstatus & SR_XPP) == 0)


/* Helpers for working with the instruction pointer */
static inline unsigned long instruction_pointer(struct pt_regs *regs)
{
- return regs->sepc;
+ return regs->xepc;
}
static inline void instruction_pointer_set(struct pt_regs *regs,
unsigned long val)
{
- regs->sepc = val;
+ regs->xepc = val;
}

#define profile_pc(regs) instruction_pointer(regs)
diff --git a/arch/riscv/include/asm/switch_to.h b/arch/riscv/include/asm/switch_to.h
index 853b65ef656d..4cbe33bb5dd7 100644
--- a/arch/riscv/include/asm/switch_to.h
+++ b/arch/riscv/include/asm/switch_to.h
@@ -16,13 +16,13 @@ extern void __fstate_restore(struct task_struct *restore_from);

static inline void __fstate_clean(struct pt_regs *regs)
{
- regs->sstatus |= (regs->sstatus & ~(SR_FS)) | SR_FS_CLEAN;
+ regs->xstatus |= (regs->xstatus & ~(SR_FS)) | SR_FS_CLEAN;
}

static inline void fstate_save(struct task_struct *task,
struct pt_regs *regs)
{
- if ((regs->sstatus & SR_FS) == SR_FS_DIRTY) {
+ if ((regs->xstatus & SR_FS) == SR_FS_DIRTY) {
__fstate_save(task);
__fstate_clean(regs);
}
@@ -31,7 +31,7 @@ static inline void fstate_save(struct task_struct *task,
static inline void fstate_restore(struct task_struct *task,
struct pt_regs *regs)
{
- if ((regs->sstatus & SR_FS) != SR_FS_OFF) {
+ if ((regs->xstatus & SR_FS) != SR_FS_OFF) {
__fstate_restore(task);
__fstate_clean(regs);
}
@@ -43,7 +43,7 @@ static inline void __switch_to_aux(struct task_struct *prev,
struct pt_regs *regs;

regs = task_pt_regs(prev);
- if (unlikely(regs->sstatus & SR_SD))
+ if (unlikely(regs->xstatus & SR_SD))
fstate_save(prev, regs);
fstate_restore(next, task_pt_regs(next));
}
diff --git a/arch/riscv/kernel/asm-offsets.c b/arch/riscv/kernel/asm-offsets.c
index 9f5628c38ac9..d631ad41917b 100644
--- a/arch/riscv/kernel/asm-offsets.c
+++ b/arch/riscv/kernel/asm-offsets.c
@@ -71,7 +71,7 @@ void asm_offsets(void)
OFFSET(TASK_THREAD_FCSR, task_struct, thread.fstate.fcsr);

DEFINE(PT_SIZE, sizeof(struct pt_regs));
- OFFSET(PT_SEPC, pt_regs, sepc);
+ OFFSET(PT_XEPC, pt_regs, xepc);
OFFSET(PT_RA, pt_regs, ra);
OFFSET(PT_FP, pt_regs, s0);
OFFSET(PT_S0, pt_regs, s0);
@@ -105,9 +105,9 @@ void asm_offsets(void)
OFFSET(PT_T6, pt_regs, t6);
OFFSET(PT_GP, pt_regs, gp);
OFFSET(PT_ORIG_A0, pt_regs, orig_a0);
- OFFSET(PT_SSTATUS, pt_regs, sstatus);
- OFFSET(PT_SBADADDR, pt_regs, sbadaddr);
- OFFSET(PT_SCAUSE, pt_regs, scause);
+ OFFSET(PT_XSTATUS, pt_regs, xstatus);
+ OFFSET(PT_XBADADDR, pt_regs, xbadaddr);
+ OFFSET(PT_XCAUSE, pt_regs, xcause);

/*
* THREAD_{F,X}* might be larger than a S-type offset can handle, but
diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
index bc7a56e1ca6f..18eeb1eec9d5 100644
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
@@ -26,14 +26,14 @@

/*
* If coming from userspace, preserve the user thread pointer and load
- * the kernel thread pointer. If we came from the kernel, sscratch
- * will contain 0, and we should continue on the current TP.
+ * the kernel thread pointer. If we came from the kernel, the scratch
+ * register will contain 0, and we should continue on the current TP.
*/
- csrrw tp, CSR_SSCRATCH, tp
+ csrrw tp, CSR_XSCRATCH, tp
bnez tp, _save_context

_restore_kernel_tpsp:
- csrr tp, CSR_SSCRATCH
+ csrr tp, CSR_XSCRATCH
REG_S sp, TASK_TI_KERNEL_SP(tp)
_save_context:
REG_S sp, TASK_TI_USER_SP(tp)
@@ -79,16 +79,16 @@ _save_context:
li t0, SR_SUM | SR_FS

REG_L s0, TASK_TI_USER_SP(tp)
- csrrc s1, CSR_SSTATUS, t0
- csrr s2, CSR_SEPC
- csrr s3, CSR_STVAL
- csrr s4, CSR_SCAUSE
- csrr s5, CSR_SSCRATCH
+ csrrc s1, CSR_XSTATUS, t0
+ csrr s2, CSR_XEPC
+ csrr s3, CSR_XTVAL
+ csrr s4, CSR_XCAUSE
+ csrr s5, CSR_XSCRATCH
REG_S s0, PT_SP(sp)
- REG_S s1, PT_SSTATUS(sp)
- REG_S s2, PT_SEPC(sp)
- REG_S s3, PT_SBADADDR(sp)
- REG_S s4, PT_SCAUSE(sp)
+ REG_S s1, PT_XSTATUS(sp)
+ REG_S s2, PT_XEPC(sp)
+ REG_S s3, PT_XBADADDR(sp)
+ REG_S s4, PT_XCAUSE(sp)
REG_S s5, PT_TP(sp)
.endm

@@ -97,10 +97,10 @@ _save_context:
* registers from the stack.
*/
.macro RESTORE_ALL
- REG_L a0, PT_SSTATUS(sp)
- REG_L a2, PT_SEPC(sp)
- csrw CSR_SSTATUS, a0
- csrw CSR_SEPC, a2
+ REG_L a0, PT_XSTATUS(sp)
+ REG_L a2, PT_XEPC(sp)
+ csrw CSR_XSTATUS, a0
+ csrw CSR_XEPC, a2

REG_L x1, PT_RA(sp)
REG_L x3, PT_GP(sp)
@@ -144,10 +144,10 @@ ENTRY(handle_exception)
SAVE_ALL

/*
- * Set sscratch register to 0, so that if a recursive exception
+ * Set the scratch register to 0, so that if a recursive exception
* occurs, the exception vector knows it came from the kernel
*/
- csrw CSR_SSCRATCH, x0
+ csrw CSR_XSCRATCH, x0

/* Load the global pointer */
.option push
@@ -167,7 +167,7 @@ ENTRY(handle_exception)
tail do_IRQ
1:
/* Exceptions run with interrupts enabled */
- csrs sstatus, SR_SIE
+ csrs CSR_XSTATUS, SR_MIE

/* Handle syscalls */
li t0, EXC_SYSCALL
@@ -194,7 +194,7 @@ handle_syscall:
* scall instruction on sret
*/
addi s2, s2, 0x4
- REG_S s2, PT_SEPC(sp)
+ REG_S s2, PT_XEPC(sp)
/* Trace syscalls, but only if requested by the user. */
REG_L t0, TASK_TI_FLAGS(tp)
andi t0, t0, _TIF_SYSCALL_WORK
@@ -221,9 +221,15 @@ ret_from_syscall:
bnez t0, handle_syscall_trace_exit

ret_from_exception:
- REG_L s0, PT_SSTATUS(sp)
- csrc sstatus, SR_SIE
+ REG_L s0, PT_XSTATUS(sp)
+ csrc CSR_XSTATUS, SR_MIE
+#ifdef CONFIG_M_MODE
+ /* the MPP value is too large to be used as an immediate arg for addi */
+ li t0, SR_MPP
+ and s0, s0, t0
+#else
andi s0, s0, SR_SPP
+#endif
bnez s0, resume_kernel

resume_userspace:
@@ -237,14 +243,14 @@ resume_userspace:
REG_S s0, TASK_TI_KERNEL_SP(tp)

/*
- * Save TP into sscratch, so we can find the kernel data structures
- * again.
+ * Save TP into the scratch register , so we can find the kernel data
+ * structures again.
*/
- csrw CSR_SSCRATCH, tp
+ csrw CSR_XSCRATCH, tp

restore_all:
RESTORE_ALL
- sret
+ Xret

#if IS_ENABLED(CONFIG_PREEMPT)
resume_kernel:
@@ -265,7 +271,7 @@ work_pending:
bnez s1, work_resched
work_notifysig:
/* Handle pending signals and notify-resume requests */
- csrs sstatus, SR_SIE /* Enable interrupts for do_notify_resume() */
+ csrs CSR_XSTATUS, SR_MIE /* Enable interrupts for do_notify_resume() */
move a0, sp /* pt_regs */
move a1, s0 /* current_thread_info->flags */
tail do_notify_resume
diff --git a/arch/riscv/kernel/fpu.S b/arch/riscv/kernel/fpu.S
index 1defb0618aff..1dade31f4564 100644
--- a/arch/riscv/kernel/fpu.S
+++ b/arch/riscv/kernel/fpu.S
@@ -23,7 +23,7 @@ ENTRY(__fstate_save)
li a2, TASK_THREAD_F0
add a0, a0, a2
li t1, SR_FS
- csrs sstatus, t1
+ csrs CSR_XSTATUS, t1
frcsr t0
fsd f0, TASK_THREAD_F0_F0(a0)
fsd f1, TASK_THREAD_F1_F0(a0)
@@ -58,7 +58,7 @@ ENTRY(__fstate_save)
fsd f30, TASK_THREAD_F30_F0(a0)
fsd f31, TASK_THREAD_F31_F0(a0)
sw t0, TASK_THREAD_FCSR_F0(a0)
- csrc sstatus, t1
+ csrc CSR_XSTATUS, t1
ret
ENDPROC(__fstate_save)

@@ -67,7 +67,7 @@ ENTRY(__fstate_restore)
add a0, a0, a2
li t1, SR_FS
lw t0, TASK_THREAD_FCSR_F0(a0)
- csrs sstatus, t1
+ csrs CSR_XSTATUS, t1
fld f0, TASK_THREAD_F0_F0(a0)
fld f1, TASK_THREAD_F1_F0(a0)
fld f2, TASK_THREAD_F2_F0(a0)
@@ -101,6 +101,6 @@ ENTRY(__fstate_restore)
fld f30, TASK_THREAD_F30_F0(a0)
fld f31, TASK_THREAD_F31_F0(a0)
fscsr t0
- csrc sstatus, t1
+ csrc CSR_XSTATUS, t1
ret
ENDPROC(__fstate_restore)
diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
index 5681179183d4..cb5691d82b0b 100644
--- a/arch/riscv/kernel/head.S
+++ b/arch/riscv/kernel/head.S
@@ -16,8 +16,8 @@
__INIT
ENTRY(_start)
/* Mask all interrupts */
- csrw CSR_SIE, zero
- csrw CSR_SIP, zero
+ csrw CSR_XIE, zero
+ csrw CSR_XIP, zero

/* flush the instruction cache */
fence.i
@@ -36,7 +36,7 @@ ENTRY(_start)
* floating point in kernel space
*/
li t0, SR_FS
- csrc sstatus, t0
+ csrc CSR_XSTATUS, t0

/* Pick one hart to run the main boot sequence */
la a3, hart_lottery
@@ -85,7 +85,7 @@ relocate:
/* Point stvec to virtual address of intruction after satp write */
la a0, 1f
add a0, a0, a1
- csrw CSR_STVEC, a0
+ csrw CSR_XTVEC, a0

/* Compute satp for kernel page tables, but don't load it yet */
la a2, swapper_pg_dir
@@ -108,7 +108,7 @@ relocate:
1:
/* Set trap vector to spin forever to help debug */
la a0, .Lsecondary_park
- csrw CSR_STVEC, a0
+ csrw CSR_XTVEC, a0

/* Reload the global pointer */
.option push
@@ -134,7 +134,7 @@ relocate:

/* Set trap vector to spin forever to help debug */
la a3, .Lsecondary_park
- csrw CSR_STVEC, a3
+ csrw CSR_XTVEC, a3

slli a3, a0, LGREG
la a1, __cpu_up_stack_pointer
@@ -196,7 +196,7 @@ ENTRY(reset_regs)
li t4, 0
li t5, 0
li t6, 0
- csrw sscratch, 0
+ csrw CSR_XSCRATCH, 0

#ifdef CONFIG_FPU
csrr t0, misa
@@ -204,7 +204,7 @@ ENTRY(reset_regs)
bnez t0, .Lreset_regs_done

li t1, SR_FS
- csrs sstatus, t1
+ csrs CSR_XSTATUS, t1
fmv.s.x f0, zero
fmv.s.x f1, zero
fmv.s.x f2, zero
diff --git a/arch/riscv/kernel/irq.c b/arch/riscv/kernel/irq.c
index 6d8659388c49..804ff70bb853 100644
--- a/arch/riscv/kernel/irq.c
+++ b/arch/riscv/kernel/irq.c
@@ -29,7 +29,7 @@ asmlinkage void __irq_entry do_IRQ(struct pt_regs *regs)
struct pt_regs *old_regs = set_irq_regs(regs);

irq_enter();
- switch (regs->scause & ~SCAUSE_IRQ_FLAG) {
+ switch (regs->xcause & ~XCAUSE_IRQ_FLAG) {
case INTERRUPT_CAUSE_TIMER:
riscv_timer_interrupt();
break;
@@ -46,7 +46,7 @@ asmlinkage void __irq_entry do_IRQ(struct pt_regs *regs)
handle_arch_irq(regs);
break;
default:
- pr_alert("unexpected interrupt cause 0x%lx", regs->scause);
+ pr_alert("unexpected interrupt cause 0x%lx", regs->xcause);
BUG();
}
irq_exit();
diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c
index f23794bd1e90..1f03920d07d3 100644
--- a/arch/riscv/kernel/process.c
+++ b/arch/riscv/kernel/process.c
@@ -34,7 +34,7 @@ void show_regs(struct pt_regs *regs)
show_regs_print_info(KERN_DEFAULT);

pr_cont("sepc: " REG_FMT " ra : " REG_FMT " sp : " REG_FMT "\n",
- regs->sepc, regs->ra, regs->sp);
+ regs->xepc, regs->ra, regs->sp);
pr_cont(" gp : " REG_FMT " tp : " REG_FMT " t0 : " REG_FMT "\n",
regs->gp, regs->tp, regs->t0);
pr_cont(" t1 : " REG_FMT " t2 : " REG_FMT " s0 : " REG_FMT "\n",
@@ -56,17 +56,17 @@ void show_regs(struct pt_regs *regs)
pr_cont(" t5 : " REG_FMT " t6 : " REG_FMT "\n",
regs->t5, regs->t6);

- pr_cont("sstatus: " REG_FMT " sbadaddr: " REG_FMT " scause: " REG_FMT "\n",
- regs->sstatus, regs->sbadaddr, regs->scause);
+ pr_cont("status: " REG_FMT " badaddr: " REG_FMT " cause: " REG_FMT "\n",
+ regs->xstatus, regs->xbadaddr, regs->xcause);
}

void start_thread(struct pt_regs *regs, unsigned long pc,
unsigned long sp)
{
- regs->sstatus = SR_SPIE;
+ regs->xstatus = SR_XPIE;
if (has_fpu)
- regs->sstatus |= SR_FS_INITIAL;
- regs->sepc = pc;
+ regs->xstatus |= SR_FS_INITIAL;
+ regs->xepc = pc;
regs->sp = sp;
set_fs(USER_DS);
}
@@ -101,7 +101,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
const register unsigned long gp __asm__ ("gp");
memset(childregs, 0, sizeof(struct pt_regs));
childregs->gp = gp;
- childregs->sstatus = SR_SPP | SR_SPIE; /* Supervisor, irqs on */
+ /* Supervisor/Machine, irqs on: */
+ childregs->xstatus = SR_XPP | SR_XPIE;

p->thread.ra = (unsigned long)ret_from_kernel_thread;
p->thread.s[0] = usp; /* fn */
diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c
index 1fe1b02e44d0..dfb26b64e17a 100644
--- a/arch/riscv/kernel/signal.c
+++ b/arch/riscv/kernel/signal.c
@@ -124,7 +124,7 @@ SYSCALL_DEFINE0(rt_sigreturn)
pr_info_ratelimited(
"%s[%d]: bad frame in %s: frame=%p pc=%p sp=%p\n",
task->comm, task_pid_nr(task), __func__,
- frame, (void *)regs->sepc, (void *)regs->sp);
+ frame, (void *)regs->xepc, (void *)regs->sp);
}
force_sig(SIGSEGV, task);
return 0;
@@ -199,7 +199,7 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
* We always pass siginfo and mcontext, regardless of SA_SIGINFO,
* since some things rely on this (e.g. glibc's debug/segfault.c).
*/
- regs->sepc = (unsigned long)ksig->ka.sa.sa_handler;
+ regs->xepc = (unsigned long)ksig->ka.sa.sa_handler;
regs->sp = (unsigned long)frame;
regs->a0 = ksig->sig; /* a0: signal number */
regs->a1 = (unsigned long)(&frame->info); /* a1: siginfo pointer */
@@ -208,7 +208,7 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
#if DEBUG_SIG
pr_info("SIG deliver (%s:%d): sig=%d pc=%p ra=%p sp=%p\n",
current->comm, task_pid_nr(current), ksig->sig,
- (void *)regs->sepc, (void *)regs->ra, frame);
+ (void *)regs->xepc, (void *)regs->ra, frame);
#endif

return 0;
@@ -220,10 +220,9 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
int ret;

/* Are we from a system call? */
- if (regs->scause == EXC_SYSCALL) {
+ if (regs->xcause == EXC_SYSCALL) {
/* Avoid additional syscall restarting via ret_from_exception */
- regs->scause = -1UL;
-
+ regs->xcause = -1UL;
/* If so, check system call restarting.. */
switch (regs->a0) {
case -ERESTART_RESTARTBLOCK:
@@ -239,7 +238,7 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
/* fallthrough */
case -ERESTARTNOINTR:
regs->a0 = regs->orig_a0;
- regs->sepc -= 0x4;
+ regs->xepc -= 0x4;
break;
}
}
@@ -261,9 +260,9 @@ static void do_signal(struct pt_regs *regs)
}

/* Did we come from a system call? */
- if (regs->scause == EXC_SYSCALL) {
+ if (regs->xcause == EXC_SYSCALL) {
/* Avoid additional syscall restarting via ret_from_exception */
- regs->scause = -1UL;
+ regs->xcause = -1UL;

/* Restart the system call - no handlers present */
switch (regs->a0) {
@@ -271,12 +270,12 @@ static void do_signal(struct pt_regs *regs)
case -ERESTARTSYS:
case -ERESTARTNOINTR:
regs->a0 = regs->orig_a0;
- regs->sepc -= 0x4;
+ regs->xepc -= 0x4;
break;
case -ERESTART_RESTARTBLOCK:
regs->a0 = regs->orig_a0;
regs->a7 = __NR_restart_syscall;
- regs->sepc -= 0x4;
+ regs->xepc -= 0x4;
break;
}
}
diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index 6b32190ba73c..e028276928f8 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -40,7 +40,7 @@ void die(struct pt_regs *regs, const char *str)
print_modules();
show_regs(regs);

- ret = notify_die(DIE_OOPS, str, regs, 0, regs->scause, SIGSEGV);
+ ret = notify_die(DIE_OOPS, str, regs, 0, regs->xcause, SIGSEGV);

bust_spinlocks(0);
add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
@@ -84,7 +84,7 @@ static void do_trap_error(struct pt_regs *regs, int signo, int code,
#define DO_ERROR_INFO(name, signo, code, str) \
asmlinkage void name(struct pt_regs *regs) \
{ \
- do_trap_error(regs, signo, code, regs->sepc, "Oops - " str); \
+ do_trap_error(regs, signo, code, regs->xepc, "Oops - " str); \
}

DO_ERROR_INFO(do_trap_unknown,
@@ -127,12 +127,12 @@ asmlinkage void do_trap_break(struct pt_regs *regs)
if (!user_mode(regs)) {
enum bug_trap_type type;

- type = report_bug(regs->sepc, regs);
+ type = report_bug(regs->xepc, regs);
switch (type) {
case BUG_TRAP_TYPE_NONE:
break;
case BUG_TRAP_TYPE_WARN:
- regs->sepc += get_break_insn_length(regs->sepc);
+ regs->xepc += get_break_insn_length(regs->xepc);
break;
case BUG_TRAP_TYPE_BUG:
die(regs, "Kernel BUG");
@@ -140,7 +140,7 @@ asmlinkage void do_trap_break(struct pt_regs *regs)
}
#endif /* CONFIG_GENERIC_BUG */

- force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)(regs->sepc), current);
+ force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)(regs->xepc), current);
}

#ifdef CONFIG_GENERIC_BUG
@@ -165,9 +165,9 @@ void __init trap_init(void)
* Set sup0 scratch register to 0, indicating to exception vector
* that we are presently executing in the kernel
*/
- csr_write(CSR_SSCRATCH, 0);
+ csr_write(CSR_XSCRATCH, 0);
/* Set the exception vector address */
- csr_write(CSR_STVEC, &handle_exception);
+ csr_write(CSR_XTVEC, &handle_exception);
/* Enable all interrupts */
- csr_write(CSR_SIE, -1);
+ csr_write(CSR_XIE, -1);
}
diff --git a/arch/riscv/lib/uaccess.S b/arch/riscv/lib/uaccess.S
index 399e6f0c2d98..f47a2ea4dc89 100644
--- a/arch/riscv/lib/uaccess.S
+++ b/arch/riscv/lib/uaccess.S
@@ -18,7 +18,7 @@ ENTRY(__asm_copy_from_user)

/* Enable access to user memory */
li t6, SR_SUM
- csrs sstatus, t6
+ csrs CSR_XSTATUS, t6

add a3, a1, a2
/* Use word-oriented copy only if low-order bits match */
@@ -47,7 +47,7 @@ ENTRY(__asm_copy_from_user)

3:
/* Disable access to user memory */
- csrc sstatus, t6
+ csrc CSR_XSTATUS, t6
li a0, 0
ret
4: /* Edge case: unalignment */
@@ -72,7 +72,7 @@ ENTRY(__clear_user)

/* Enable access to user memory */
li t6, SR_SUM
- csrs sstatus, t6
+ csrs CSR_XSTATUS, t6

add a3, a0, a1
addi t0, a0, SZREG-1
@@ -94,7 +94,7 @@ ENTRY(__clear_user)

3:
/* Disable access to user memory */
- csrc sstatus, t6
+ csrc CSR_XSTATUS, t6
li a0, 0
ret
4: /* Edge case: unalignment */
@@ -114,11 +114,11 @@ ENDPROC(__clear_user)
/* Fixup code for __copy_user(10) and __clear_user(11) */
10:
/* Disable access to user memory */
- csrs sstatus, t6
+ csrs CSR_XSTATUS, t6
mv a0, a2
ret
11:
- csrs sstatus, t6
+ csrs CSR_XSTATUS, t6
mv a0, a1
ret
.previous
diff --git a/arch/riscv/mm/extable.c b/arch/riscv/mm/extable.c
index 7aed9178d365..e0659deeb16b 100644
--- a/arch/riscv/mm/extable.c
+++ b/arch/riscv/mm/extable.c
@@ -15,9 +15,9 @@ int fixup_exception(struct pt_regs *regs)
{
const struct exception_table_entry *fixup;

- fixup = search_exception_tables(regs->sepc);
+ fixup = search_exception_tables(regs->xepc);
if (fixup) {
- regs->sepc = fixup->fixup;
+ regs->xepc = fixup->fixup;
return 1;
}
return 0;
diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
index fd7662afddea..82b110e9eaff 100644
--- a/arch/riscv/mm/fault.c
+++ b/arch/riscv/mm/fault.c
@@ -31,8 +31,8 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
int code = SEGV_MAPERR;
vm_fault_t fault;

- cause = regs->scause;
- addr = regs->sbadaddr;
+ cause = regs->xcause;
+ addr = regs->xbadaddr;

tsk = current;
mm = tsk->mm;
@@ -50,7 +50,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
goto vmalloc_fault;

/* Enable interrupts if they were enabled in the parent context. */
- if (likely(regs->sstatus & SR_SPIE))
+ if (likely(regs->xstatus & SR_XPIE))
local_irq_enable();

/*
diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c
index 5e6038fbf115..2e2d363faabf 100644
--- a/drivers/clocksource/timer-riscv.c
+++ b/drivers/clocksource/timer-riscv.c
@@ -28,7 +28,7 @@
static int riscv_clock_next_event(unsigned long delta,
struct clock_event_device *ce)
{
- csr_set(sie, SIE_STIE);
+ csr_set(CSR_XIE, XIE_XTIE);
sbi_set_timer(get_cycles64() + delta);
return 0;
}
@@ -70,13 +70,13 @@ static int riscv_timer_starting_cpu(unsigned int cpu)
ce->cpumask = cpumask_of(cpu);
clockevents_config_and_register(ce, riscv_timebase, 100, 0x7fffffff);

- csr_set(sie, SIE_STIE);
+ csr_set(CSR_XIE, XIE_XTIE);
return 0;
}

static int riscv_timer_dying_cpu(unsigned int cpu)
{
- csr_clear(sie, SIE_STIE);
+ csr_clear(CSR_XIE, XIE_XTIE);
return 0;
}

@@ -85,7 +85,7 @@ void riscv_timer_interrupt(void)
{
struct clock_event_device *evdev = this_cpu_ptr(&riscv_clock_event);

- csr_clear(sie, SIE_STIE);
+ csr_clear(CSR_XIE, XIE_XTIE);
evdev->event_handler(evdev);
}

diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index c72c036aea76..4ee96ac90ea4 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -179,7 +179,7 @@ static void plic_handle_irq(struct pt_regs *regs)

WARN_ON_ONCE(!handler->present);

- csr_clear(sie, SIE_SEIE);
+ csr_clear(CSR_XIE, XIE_XEIE);
while ((hwirq = readl(claim))) {
int irq = irq_find_mapping(plic_irqdomain, hwirq);

@@ -190,7 +190,7 @@ static void plic_handle_irq(struct pt_regs *regs)
generic_handle_irq(irq);
writel(hwirq, claim);
}
- csr_set(sie, SIE_SEIE);
+ csr_set(CSR_XIE, XIE_XEIE);
}

/*
--
2.20.1