[src/trunk]: src/sys/arch/riscv Update CAUSE_* defines to reflect riscv-privi...

[skrll <skrll%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/a7790b09a14f
branches:  trunk
changeset: 941943:a7790b09a14f
user:      skrll <skrll%NetBSD.org@localhost>
date:      Sun Nov 01 21:09:48 2020 +0000

description:
Update CAUSE_* defines to reflect riscv-privileged-20190608.pdf

diffstat:

 sys/arch/riscv/include/sysreg.h |  28 +++++++++++++++---------
 sys/arch/riscv/riscv/trap.c     |  46 +++++++++++++++++++---------------------
 2 files changed, 39 insertions(+), 35 deletions(-)

diffs (153 lines):

diff -r b314abba6e4f -r a7790b09a14f sys/arch/riscv/include/sysreg.h
--- a/sys/arch/riscv/include/sysreg.h   Sun Nov 01 21:06:22 2020 +0000
+++ b/sys/arch/riscv/include/sysreg.h   Sun Nov 01 21:09:48 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: sysreg.h,v 1.5 2020/03/14 16:12:16 skrll Exp $ */
+/* $NetBSD: sysreg.h,v 1.6 2020/11/01 21:09:48 skrll Exp $ */
 
 /*
  * Copyright (c) 2014 The NetBSD Foundation, Inc.
@@ -155,18 +155,24 @@
 }
 
 // Cause register
-#define CAUSE_MISALIGNED_FETCH         0
-#define CAUSE_FAULT_FETCH              1
+#define CAUSE_FETCH_MISALIGNED         0
+#define CAUSE_FETCH_ACCESS             1
 #define CAUSE_ILLEGAL_INSTRUCTION      2
-#define CAUSE_PRIVILEGED_INSTRUCTION   3
-#define CAUSE_MISALIGNED_LOAD          4
-#define CAUSE_FAULT_LOAD               5
-#define CAUSE_MISALIGNED_STORE         6
-#define CAUSE_FAULT_STORE              7
+#define CAUSE_BREAKPOINT               3
+#define CAUSE_LOAD_MISALIGNED          4
+#define CAUSE_LOAD_ACCESS              5
+#define CAUSE_STORE_MISALIGNED         6
+#define CAUSE_STORE_ACCESS             7
 #define CAUSE_SYSCALL                  8
-#define CAUSE_BREAKPOINT               9
-#define CAUSE_FP_DISABLED              10
-#define CAUSE_ACCELERATOR_DISABLED     12
+#define CAUSE_USER_ECALL               8
+#define CAUSE_SUPERVISOR_ECALL         9
+/* 10 is reserved */
+#define CAUSE_MACHINE_ECALL            11
+#define CAUSE_FETCH_PAGE_FAULT         12
+#define CAUSE_LOAD_PAGE_FAULT          13
+/* 14 is Reserved */
+#define CAUSE_STORE_PAGE_FAULT         15
+/* >= 16 is reserved */
 
 static inline uint64_t
 riscvreg_cycle_read(void)
diff -r b314abba6e4f -r a7790b09a14f sys/arch/riscv/riscv/trap.c
--- a/sys/arch/riscv/riscv/trap.c       Sun Nov 01 21:06:22 2020 +0000
+++ b/sys/arch/riscv/riscv/trap.c       Sun Nov 01 21:09:48 2020 +0000
@@ -32,7 +32,7 @@
 #define __PMAP_PRIVATE
 #define __UFETCHSTORE_PRIVATE
 
-__RCSID("$NetBSD: trap.c,v 1.9 2020/11/01 21:06:22 skrll Exp $");
+__RCSID("$NetBSD: trap.c,v 1.10 2020/11/01 21:09:48 skrll Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -46,27 +46,24 @@
 
 #include <riscv/locore.h>
 
-#define        INSTRUCTION_TRAP_MASK   (__BIT(CAUSE_PRIVILEGED_INSTRUCTION) \
-                               |__BIT(CAUSE_ILLEGAL_INSTRUCTION))
+#define        INSTRUCTION_TRAP_MASK   (__BIT(CAUSE_ILLEGAL_INSTRUCTION))
 
-#define        FAULT_TRAP_MASK         (__BIT(CAUSE_FAULT_FETCH) \
-                               |__BIT(CAUSE_FAULT_LOAD) \
-                               |__BIT(CAUSE_FAULT_STORE))
+#define        FAULT_TRAP_MASK         (__BIT(CAUSE_FETCH_ACCESS) \
+                               |__BIT(CAUSE_LOAD_ACCESS) \
+                               |__BIT(CAUSE_STORE_ACCESS))
 
-#define        MISALIGNED_TRAP_MASK    (__BIT(CAUSE_MISALIGNED_FETCH) \
-                               |__BIT(CAUSE_MISALIGNED_LOAD) \
-                               |__BIT(CAUSE_MISALIGNED_STORE))
+#define        MISALIGNED_TRAP_MASK    (__BIT(CAUSE_FETCH_MISALIGNED) \
+                               |__BIT(CAUSE_LOAD_MISALIGNED) \
+                               |__BIT(CAUSE_STORE_MISALIGNED))
 
 static const char * const causenames[] = {
-       [CAUSE_MISALIGNED_FETCH] = "misaligned fetch",
-       [CAUSE_MISALIGNED_LOAD] = "misaligned load",
-       [CAUSE_MISALIGNED_STORE] = "misaligned store",
-       [CAUSE_FAULT_FETCH] = "fetch",
-       [CAUSE_FAULT_LOAD] = "load",
-       [CAUSE_FAULT_STORE] = "store",
-       [CAUSE_FP_DISABLED] = "fp disabled",
+       [CAUSE_FETCH_MISALIGNED] = "misaligned fetch",
+       [CAUSE_LOAD_MISALIGNED] = "misaligned load",
+       [CAUSE_STORE_MISALIGNED] = "misaligned store",
+       [CAUSE_FETCH_ACCESS] = "fetch",
+       [CAUSE_LOAD_ACCESS] = "load",
+       [CAUSE_STORE_ACCESS] = "store",
        [CAUSE_ILLEGAL_INSTRUCTION] = "illegal instruction",
-       [CAUSE_PRIVILEGED_INSTRUCTION] = "privileged instruction",
        [CAUSE_BREAKPOINT] = "breakpoint",
 };
 
@@ -220,11 +217,11 @@
 static inline vm_prot_t
 get_faulttype(register_t cause)
 {
-       if (cause == CAUSE_FAULT_LOAD)
+       if (cause == CAUSE_LOAD_ACCESS)
                return VM_PROT_READ;
-       if (cause == CAUSE_FAULT_STORE)
+       if (cause == CAUSE_STORE_ACCESS)
                return VM_PROT_READ | VM_PROT_WRITE;
-       KASSERT(cause == CAUSE_FAULT_FETCH);
+       KASSERT(cause == CAUSE_FETCH_ACCESS);
        return VM_PROT_READ | VM_PROT_EXECUTE;
 }
 
@@ -256,12 +253,12 @@
                        attr |= VM_PAGEMD_REFERENCED;
                }
 #if 0          /* XXX Outdated */
-               if (cause == CAUSE_FAULT_STORE) {
+               if (cause == CAUSE_STORE_ACCESS) {
                        if ((npte & PTE_NW) != 0) {
                                npte &= ~PTE_NW;
                                attr |= VM_PAGEMD_MODIFIED;
                        }
-               } else if (cause == CAUSE_FAULT_FETCH) {
+               } else if (cause == CAUSE_FETCH_ACCESS) {
                        if ((npte & PTE_NX) != 0) {
                                npte &= ~PTE_NX;
                                attr |= VM_PAGEMD_EXECPAGE;
@@ -349,9 +346,8 @@
 trap_instruction(struct trapframe *tf, register_t epc, register_t status,
     register_t cause, register_t badaddr, bool usertrap_p, ksiginfo_t *ksi)
 {
-       const bool prvopc_p = (cause == CAUSE_PRIVILEGED_INSTRUCTION);
        if (usertrap_p) {
-               trap_ksi_init(ksi, SIGILL, prvopc_p ? ILL_PRVOPC : ILL_ILLOPC,
+               trap_ksi_init(ksi, SIGILL, ILL_ILLOPC,
                    (intptr_t)badaddr, cause);
        }
        return false;
@@ -395,12 +391,14 @@
        } else if (fault_mask & INSTRUCTION_TRAP_MASK) {
                ok = trap_instruction(tf, epc, status, cause, addr,
                    usertrap_p, &ksi);
+#if 0
        } else if (fault_mask && __BIT(CAUSE_FP_DISABLED)) {
                if (!usertrap_p) {
                        panic("%s: fp used @ %#"PRIxREGISTER" in kernel!",
                            __func__, tf->tf_pc);
                }
                fpu_load();
+#endif
        } else if (fault_mask & MISALIGNED_TRAP_MASK) {
                ok = trap_misalignment(tf, epc, status, cause, addr,
                    usertrap_p, &ksi);