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riscv: abstract out CSR names for supervisor vs machine mode

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Many of the privileged CSRs exist in a supervisor and machine version
that are used very similarly.  Provide versions of the CSR names and
fields that map to either the S-mode or M-mode variant depending on
a new CONFIG_RISCV_M_MODE kconfig symbol.

Contains contributions from Damien Le Moal <Damien.LeMoal@wdc.com>
and Paul Walmsley <paul.walmsley@sifive.com>.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de> # for drivers/clocksource, drivers/irqchip
[paul.walmsley@sifive.com: updated to apply]
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
This commit is contained in:
Christoph Hellwig 2019-10-28 13:10:32 +01:00 committed by Paul Walmsley
parent 0c3ac28931
commit a4c3733d32
21 changed files with 199 additions and 135 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/riscv/Kconfig
View File

@ -72,6 +72,10 @@ config ARCH_MMAP_RND_BITS_MAX
default 24 if 64BIT # SV39 based
default 17
# set if we run in machine mode, cleared if we run in supervisor mode
config RISCV_M_MODE
bool
config MMU
def_bool y

72
arch/riscv/include/asm/csr.h
View File

@ -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 */
@ -44,9 +47,10 @@
#define SATP_MODE SATP_MODE_39
#endif
/* SCAUSE */
#define SCAUSE_IRQ_FLAG (_AC(1, UL) << (__riscv_xlen - 1))
/* Exception cause high bit - is an interrupt if set */
#define CAUSE_IRQ_FLAG (_AC(1, UL) << (__riscv_xlen - 1))
/* Interrupt causes (minus the high bit) */
#define IRQ_U_SOFT 0
#define IRQ_S_SOFT 1
#define IRQ_M_SOFT 3
@ -57,6 +61,7 @@
#define IRQ_S_EXT 9
#define IRQ_M_EXT 11
/* Exception causes */
#define EXC_INST_MISALIGNED 0
#define EXC_INST_ACCESS 1
#define EXC_BREAKPOINT 3
@ -67,14 +72,14 @@
#define EXC_LOAD_PAGE_FAULT 13
#define EXC_STORE_PAGE_FAULT 15
/* SIE (Interrupt Enable) and SIP (Interrupt Pending) 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_CYCLE 0xc00
#define CSR_TIME 0xc01
#define CSR_INSTRET 0xc02
#define CSR_CYCLEH 0xc80
#define CSR_TIMEH 0xc81
#define CSR_INSTRETH 0xc82
#define CSR_SSTATUS 0x100
#define CSR_SIE 0x104
#define CSR_STVEC 0x105
@ -85,9 +90,56 @@
#define CSR_STVAL 0x143
#define CSR_SIP 0x144
#define CSR_SATP 0x180
#define CSR_CYCLEH 0xc80
#define CSR_TIMEH 0xc81
#define CSR_INSTRETH 0xc82
#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
#ifdef CONFIG_RISCV_M_MODE
# define CSR_STATUS CSR_MSTATUS
# define CSR_IE CSR_MIE
# define CSR_TVEC CSR_MTVEC
# define CSR_SCRATCH CSR_MSCRATCH
# define CSR_EPC CSR_MEPC
# define CSR_CAUSE CSR_MCAUSE
# define CSR_TVAL CSR_MTVAL
# define CSR_IP CSR_MIP
# define SR_IE SR_MIE
# define SR_PIE SR_MPIE
# define SR_PP SR_MPP
# define IRQ_SOFT IRQ_M_SOFT
# define IRQ_TIMER IRQ_M_TIMER
# define IRQ_EXT IRQ_M_EXT
#else /* CONFIG_RISCV_M_MODE */
# define CSR_STATUS CSR_SSTATUS
# define CSR_IE CSR_SIE
# define CSR_TVEC CSR_STVEC
# define CSR_SCRATCH CSR_SSCRATCH
# define CSR_EPC CSR_SEPC
# define CSR_CAUSE CSR_SCAUSE
# define CSR_TVAL CSR_STVAL
# define CSR_IP CSR_SIP
# define SR_IE SR_SIE
# define SR_PIE SR_SPIE
# define SR_PP SR_SPP
# define IRQ_SOFT IRQ_S_SOFT
# define IRQ_TIMER IRQ_S_TIMER
# define IRQ_EXT IRQ_S_EXT
#endif /* CONFIG_RISCV_M_MODE */
/* IE/IP (Supervisor/Machine Interrupt Enable/Pending) flags */
#define IE_SIE (_AC(0x1, UL) << IRQ_SOFT)
#define IE_TIE (_AC(0x1, UL) << IRQ_TIMER)
#define IE_EIE (_AC(0x1, UL) << IRQ_EXT)
#ifndef __ASSEMBLY__

12
arch/riscv/include/asm/irqflags.h
View File

@ -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_STATUS);
}
/* unconditionally enable interrupts */
static inline void arch_local_irq_enable(void)
{
csr_set(CSR_SSTATUS, SR_SIE);
csr_set(CSR_STATUS, SR_IE);
}
/* unconditionally disable interrupts */
static inline void arch_local_irq_disable(void)
{
csr_clear(CSR_SSTATUS, SR_SIE);
csr_clear(CSR_STATUS, SR_IE);
}
/* 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_STATUS, SR_IE);
}
/* test flags */
static inline int arch_irqs_disabled_flags(unsigned long flags)
{
return !(flags & SR_SIE);
return !(flags & SR_IE);
}
/* 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_STATUS, flags & SR_IE);
}
#endif /* _ASM_RISCV_IRQFLAGS_H */

2
arch/riscv/include/asm/processor.h
View File

@ -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)->epc)
#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)

16
arch/riscv/include/asm/ptrace.h
View File

@ -12,7 +12,7 @@
#ifndef __ASSEMBLY__
struct pt_regs {
unsigned long sepc;
unsigned long epc;
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 status;
unsigned long badaddr;
unsigned long cause;
/* 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)->status & SR_PP) == 0)
/* Helpers for working with the instruction pointer */
static inline unsigned long instruction_pointer(struct pt_regs *regs)
{
return regs->sepc;
return regs->epc;
}
static inline void instruction_pointer_set(struct pt_regs *regs,
unsigned long val)
{
regs->sepc = val;
regs->epc = val;
}
#define profile_pc(regs) instruction_pointer(regs)

10
arch/riscv/include/asm/switch_to.h
View File

@ -17,19 +17,19 @@ 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->status = (regs->status & ~SR_FS) | SR_FS_CLEAN;
}
static inline void fstate_off(struct task_struct *task,
struct pt_regs *regs)
{
regs->sstatus = (regs->sstatus & ~SR_FS) | SR_FS_OFF;
regs->status = (regs->status & ~SR_FS) | SR_FS_OFF;
}
static inline void fstate_save(struct task_struct *task,
struct pt_regs *regs)
{
if ((regs->sstatus & SR_FS) == SR_FS_DIRTY) {
if ((regs->status & SR_FS) == SR_FS_DIRTY) {
__fstate_save(task);
__fstate_clean(regs);
}
@ -38,7 +38,7 @@ 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->status & SR_FS) != SR_FS_OFF) {
__fstate_restore(task);
__fstate_clean(regs);
}
@ -50,7 +50,7 @@ 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->status & SR_SD))
fstate_save(prev, regs);
fstate_restore(next, task_pt_regs(next));
}

8
arch/riscv/kernel/asm-offsets.c
View File

@ -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_EPC, pt_regs, epc);
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_STATUS, pt_regs, status);
OFFSET(PT_BADADDR, pt_regs, badaddr);
OFFSET(PT_CAUSE, pt_regs, cause);
/*
* THREAD_{F,X}* might be larger than a S-type offset can handle, but

74
arch/riscv/kernel/entry.S
View File

@ -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_SCRATCH, tp
bnez tp, _save_context
_restore_kernel_tpsp:
csrr tp, CSR_SSCRATCH
csrr tp, CSR_SCRATCH
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_STATUS, t0
csrr s2, CSR_EPC
csrr s3, CSR_TVAL
csrr s4, CSR_CAUSE
csrr s5, CSR_SCRATCH
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_STATUS(sp)
REG_S s2, PT_EPC(sp)
REG_S s3, PT_BADADDR(sp)
REG_S s4, PT_CAUSE(sp)
REG_S s5, PT_TP(sp)
.endm
@ -97,7 +97,7 @@ _save_context:
* registers from the stack.
*/
.macro RESTORE_ALL
REG_L a0, PT_SSTATUS(sp)
REG_L a0, PT_STATUS(sp)
/*
* The current load reservation is effectively part of the processor's
* state, in the sense that load reservations cannot be shared between
@ -115,11 +115,11 @@ _save_context:
* completes, implementations are allowed to expand reservations to be
* arbitrarily large.
*/
REG_L a2, PT_SEPC(sp)
REG_SC x0, a2, PT_SEPC(sp)
REG_L a2, PT_EPC(sp)
REG_SC x0, a2, PT_EPC(sp)
csrw CSR_SSTATUS, a0
csrw CSR_SEPC, a2
csrw CSR_STATUS, a0
csrw CSR_EPC, a2
REG_L x1, PT_RA(sp)
REG_L x3, PT_GP(sp)
@ -163,10 +163,10 @@ 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_SCRATCH, x0
/* Load the global pointer */
.option push
@ -185,11 +185,13 @@ ENTRY(handle_exception)
move a0, sp /* pt_regs */
tail do_IRQ
1:
/* Exceptions run with interrupts enabled or disabled
depending on the state of sstatus.SR_SPIE */
andi t0, s1, SR_SPIE
/*
* Exceptions run with interrupts enabled or disabled depending on the
* state of SR_PIE in m/sstatus.
*/
andi t0, s1, SR_PIE
beqz t0, 1f
csrs CSR_SSTATUS, SR_SIE
csrs CSR_STATUS, SR_IE
1:
/* Handle syscalls */
@ -217,7 +219,7 @@ handle_syscall:
* scall instruction on sret
*/
addi s2, s2, 0x4
REG_S s2, PT_SEPC(sp)
REG_S s2, PT_EPC(sp)
/* Trace syscalls, but only if requested by the user. */
REG_L t0, TASK_TI_FLAGS(tp)
andi t0, t0, _TIF_SYSCALL_WORK
@ -244,9 +246,15 @@ ret_from_syscall:
bnez t0, handle_syscall_trace_exit
ret_from_exception:
REG_L s0, PT_SSTATUS(sp)
csrc CSR_SSTATUS, SR_SIE
REG_L s0, PT_STATUS(sp)
csrc CSR_STATUS, SR_IE
#ifdef CONFIG_RISCV_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:
@ -260,14 +268,18 @@ 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_SCRATCH, tp
restore_all:
RESTORE_ALL
#ifdef CONFIG_RISCV_M_MODE
mret
#else
sret
#endif
#if IS_ENABLED(CONFIG_PREEMPT)
resume_kernel:
@ -287,7 +299,7 @@ work_pending:
bnez s1, work_resched
work_notifysig:
/* Handle pending signals and notify-resume requests */
csrs CSR_SSTATUS, SR_SIE /* Enable interrupts for do_notify_resume() */
csrs CSR_STATUS, SR_IE /* Enable interrupts for do_notify_resume() */
move a0, sp /* pt_regs */
move a1, s0 /* current_thread_info->flags */
tail do_notify_resume

8
arch/riscv/kernel/fpu.S
View File

@ -23,7 +23,7 @@ ENTRY(__fstate_save)
li a2, TASK_THREAD_F0
add a0, a0, a2
li t1, SR_FS
csrs CSR_SSTATUS, t1
csrs CSR_STATUS, 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 CSR_SSTATUS, t1
csrc CSR_STATUS, 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 CSR_SSTATUS, t1
csrs CSR_STATUS, 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 CSR_SSTATUS, t1
csrc CSR_STATUS, t1
ret
ENDPROC(__fstate_restore)

12
arch/riscv/kernel/head.S
View File

@ -47,8 +47,8 @@ ENTRY(_start)
.global _start_kernel
_start_kernel:
/* Mask all interrupts */
csrw CSR_SIE, zero
csrw CSR_SIP, zero
csrw CSR_IE, zero
csrw CSR_IP, zero
/* Load the global pointer */
.option push
@ -61,7 +61,7 @@ _start_kernel:
* floating point in kernel space
*/
li t0, SR_FS
csrc CSR_SSTATUS, t0
csrc CSR_STATUS, t0
#ifdef CONFIG_SMP
li t0, CONFIG_NR_CPUS
@ -116,7 +116,7 @@ relocate:
/* Point stvec to virtual address of intruction after satp write */
la a2, 1f
add a2, a2, a1
csrw CSR_STVEC, a2
csrw CSR_TVEC, a2
/* Compute satp for kernel page tables, but don't load it yet */
srl a2, a0, PAGE_SHIFT
@ -138,7 +138,7 @@ relocate:
1:
/* Set trap vector to spin forever to help debug */
la a0, .Lsecondary_park
csrw CSR_STVEC, a0
csrw CSR_TVEC, a0
/* Reload the global pointer */
.option push
@ -161,7 +161,7 @@ relocate:
#ifdef CONFIG_SMP
/* Set trap vector to spin forever to help debug */
la a3, .Lsecondary_park
csrw CSR_STVEC, a3
csrw CSR_TVEC, a3
slli a3, a0, LGREG
la a1, __cpu_up_stack_pointer

17
arch/riscv/kernel/irq.c
View File

@ -11,13 +11,6 @@
#include <linux/seq_file.h>
#include <asm/smp.h>
/*
* Possible interrupt causes:
*/
#define INTERRUPT_CAUSE_SOFTWARE IRQ_S_SOFT
#define INTERRUPT_CAUSE_TIMER IRQ_S_TIMER
#define INTERRUPT_CAUSE_EXTERNAL IRQ_S_EXT
int arch_show_interrupts(struct seq_file *p, int prec)
{
show_ipi_stats(p, prec);
@ -29,12 +22,12 @@ asmlinkage __visible 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) {
case INTERRUPT_CAUSE_TIMER:
switch (regs->cause & ~CAUSE_IRQ_FLAG) {
case IRQ_TIMER:
riscv_timer_interrupt();
break;
#ifdef CONFIG_SMP
case INTERRUPT_CAUSE_SOFTWARE:
case IRQ_SOFT:
/*
* We only use software interrupts to pass IPIs, so if a non-SMP
* system gets one, then we don't know what to do.
@ -42,11 +35,11 @@ asmlinkage __visible void __irq_entry do_IRQ(struct pt_regs *regs)
riscv_software_interrupt();
break;
#endif
case INTERRUPT_CAUSE_EXTERNAL:
case IRQ_EXT:
handle_arch_irq(regs);
break;
default:
pr_alert("unexpected interrupt cause 0x%lx", regs->scause);
pr_alert("unexpected interrupt cause 0x%lx", regs->cause);
BUG();
}
irq_exit();

2
arch/riscv/kernel/perf_callchain.c
View File

@ -67,7 +67,7 @@ void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
return;
fp = regs->s0;
perf_callchain_store(entry, regs->sepc);
perf_callchain_store(entry, regs->epc);
fp = user_backtrace(entry, fp, regs->ra);
while (fp && !(fp & 0x3) && entry->nr < entry->max_stack)

17
arch/riscv/kernel/process.c
View File

@ -35,8 +35,8 @@ 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);
pr_cont("epc: " REG_FMT " ra : " REG_FMT " sp : " REG_FMT "\n",
regs->epc, 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",
@ -58,23 +58,23 @@ 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->status, regs->badaddr, regs->cause);
}
void start_thread(struct pt_regs *regs, unsigned long pc,
unsigned long sp)
{
regs->sstatus = SR_SPIE;
regs->status = SR_PIE;
if (has_fpu) {
regs->sstatus |= SR_FS_INITIAL;
regs->status |= SR_FS_INITIAL;
/*
* Restore the initial value to the FP register
* before starting the user program.
*/
fstate_restore(current, regs);
}
regs->sepc = pc;
regs->epc = pc;
regs->sp = sp;
set_fs(USER_DS);
}
@ -110,7 +110,8 @@ 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->status = SR_PP | SR_PIE;
p->thread.ra = (unsigned long)ret_from_kernel_thread;
p->thread.s[0] = usp; /* fn */

21
arch/riscv/kernel/signal.c
View File

@ -124,7 +124,7 @@ badframe:
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->epc, (void *)regs->sp);
}
force_sig(SIGSEGV);
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->epc = (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->epc, (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->cause == EXC_SYSCALL) {
/* Avoid additional syscall restarting via ret_from_exception */
regs->scause = -1UL;
regs->cause = -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->epc -= 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->cause == EXC_SYSCALL) {
/* Avoid additional syscall restarting via ret_from_exception */
regs->scause = -1UL;
regs->cause = -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->epc -= 0x4;
break;
case -ERESTART_RESTARTBLOCK:
regs->a0 = regs->orig_a0;
regs->a7 = __NR_restart_syscall;
regs->sepc -= 0x4;
regs->epc -= 0x4;
break;
}
}

2
arch/riscv/kernel/smp.c
View File

@ -108,7 +108,7 @@ static void send_ipi_single(int cpu, enum ipi_message_type op)
static inline void clear_ipi(void)
{
csr_clear(CSR_SIP, SIE_SSIE);
csr_clear(CSR_IP, IE_SIE);
}
void riscv_software_interrupt(void)

16
arch/riscv/kernel/traps.c
View File

@ -41,7 +41,7 @@ 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->cause, SIGSEGV);
bust_spinlocks(0);
add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
@ -86,7 +86,7 @@ static void do_trap_error(struct pt_regs *regs, int signo, int code,
#define DO_ERROR_INFO(name, signo, code, str) \
asmlinkage __visible void name(struct pt_regs *regs) \
{ \
do_trap_error(regs, signo, code, regs->sepc, "Oops - " str); \
do_trap_error(regs, signo, code, regs->epc, "Oops - " str); \
}
DO_ERROR_INFO(do_trap_unknown,
@ -124,9 +124,9 @@ static inline unsigned long get_break_insn_length(unsigned long pc)
asmlinkage __visible void do_trap_break(struct pt_regs *regs)
{
if (user_mode(regs))
force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->sepc);
else if (report_bug(regs->sepc, regs) == BUG_TRAP_TYPE_WARN)
regs->sepc += get_break_insn_length(regs->sepc);
force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->epc);
else if (report_bug(regs->epc, regs) == BUG_TRAP_TYPE_WARN)
regs->epc += get_break_insn_length(regs->epc);
else
die(regs, "Kernel BUG");
}
@ -153,9 +153,9 @@ 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_SCRATCH, 0);
/* Set the exception vector address */
csr_write(CSR_STVEC, &handle_exception);
csr_write(CSR_TVEC, &handle_exception);
/* Enable all interrupts */
csr_write(CSR_SIE, -1);
csr_write(CSR_IE, -1);
}

12
arch/riscv/lib/uaccess.S
View File

@ -18,7 +18,7 @@ ENTRY(__asm_copy_from_user)
/* Enable access to user memory */
li t6, SR_SUM
csrs CSR_SSTATUS, t6
csrs CSR_STATUS, 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 CSR_SSTATUS, t6
csrc CSR_STATUS, 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 CSR_SSTATUS, t6
csrs CSR_STATUS, t6
add a3, a0, a1
addi t0, a0, SZREG-1
@ -94,7 +94,7 @@ ENTRY(__clear_user)
3:
/* Disable access to user memory */
csrc CSR_SSTATUS, t6
csrc CSR_STATUS, 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 CSR_SSTATUS, t6
csrs CSR_STATUS, t6
mv a0, a2
ret
11:
csrs CSR_SSTATUS, t6
csrs CSR_STATUS, t6
mv a0, a1
ret
.previous

4
arch/riscv/mm/extable.c
View File

@ -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->epc);
if (fixup) {
regs->sepc = fixup->fixup;
regs->epc = fixup->fixup;
return 1;
}
return 0;

6
arch/riscv/mm/fault.c
View File

@ -34,8 +34,8 @@ 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->cause;
addr = regs->badaddr;
tsk = current;
mm = tsk->mm;
@ -53,7 +53,7 @@ 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->status & SR_PIE))
local_irq_enable();
/*

8
drivers/clocksource/timer-riscv.c
View File

@ -19,7 +19,7 @@
static int riscv_clock_next_event(unsigned long delta,
struct clock_event_device *ce)
{
csr_set(sie, SIE_STIE);
csr_set(CSR_IE, IE_TIE);
sbi_set_timer(get_cycles64() + delta);
return 0;
}
@ -61,13 +61,13 @@ 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_IE, IE_TIE);
return 0;
}
static int riscv_timer_dying_cpu(unsigned int cpu)
{
csr_clear(sie, SIE_STIE);
csr_clear(CSR_IE, IE_TIE);
return 0;
}
@ -76,7 +76,7 @@ void riscv_timer_interrupt(void)
{
struct clock_event_device *evdev = this_cpu_ptr(&riscv_clock_event);
csr_clear(sie, SIE_STIE);
csr_clear(CSR_IE, IE_TIE);
evdev->event_handler(evdev);
}

11
drivers/irqchip/irq-sifive-plic.c
View File

@ -181,7 +181,7 @@ static void plic_handle_irq(struct pt_regs *regs)
WARN_ON_ONCE(!handler->present);
csr_clear(sie, SIE_SEIE);
csr_clear(CSR_IE, IE_EIE);
while ((hwirq = readl(claim))) {
int irq = irq_find_mapping(plic_irqdomain, hwirq);
@ -191,7 +191,7 @@ static void plic_handle_irq(struct pt_regs *regs)
else
generic_handle_irq(irq);
}
csr_set(sie, SIE_SEIE);
csr_set(CSR_IE, IE_EIE);
}
/*
@ -252,8 +252,11 @@ static int __init plic_init(struct device_node *node,
continue;
}
/* skip contexts other than supervisor external interrupt */
if (parent.args[0] != IRQ_S_EXT)
/*
* Skip contexts other than external interrupts for our
* privilege level.
*/
if (parent.args[0] != IRQ_EXT)
continue;
hartid = plic_find_hart_id(parent.np);