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authorPaul Walmsley <paul.walmsley@sifive.com>2019-11-22 18:59:09 -0800
committerPaul Walmsley <paul.walmsley@sifive.com>2019-11-22 18:59:09 -0800
commit5ba9aa56e6d3e8fddb954c2f818d1ce0525235bb (patch)
treeb9f61d0544ed06b7f07000a11797711cdd97d83f /arch/riscv/kernel/entry.S
parent4a979862dde46b738316014ca4995eae2f428413 (diff)
parent405fe7aa0dbaa6cb8cfe62771eee67076d30aca1 (diff)
Merge branch 'next/nommu' into for-next
Conflicts: arch/riscv/boot/Makefile arch/riscv/include/asm/sbi.h
Diffstat (limited to 'arch/riscv/kernel/entry.S')
-rw-r--r--arch/riscv/kernel/entry.S85
1 files changed, 54 insertions, 31 deletions
diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
index c68b987e623e..a1349ca64669 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_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
@@ -267,9 +269,15 @@ ret_from_syscall_rejected:
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:
@@ -283,14 +291,18 @@ 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:
@@ -310,7 +322,7 @@ 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
@@ -409,6 +421,10 @@ ENTRY(__switch_to)
ret
ENDPROC(__switch_to)
+#ifndef CONFIG_MMU
+#define do_page_fault do_trap_unknown
+#endif
+
.section ".rodata"
/* Exception vector table */
ENTRY(excp_vect_table)
@@ -430,3 +446,10 @@ ENTRY(excp_vect_table)
RISCV_PTR do_page_fault /* store page fault */
excp_vect_table_end:
END(excp_vect_table)
+
+#ifndef CONFIG_MMU
+ENTRY(__user_rt_sigreturn)
+ li a7, __NR_rt_sigreturn
+ scall
+END(__user_rt_sigreturn)
+#endif