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diff --git a/cddl/lib/libdtrace/Makefile b/cddl/lib/libdtrace/Makefile
--- a/cddl/lib/libdtrace/Makefile
+++ b/cddl/lib/libdtrace/Makefile
@@ -128,6 +128,7 @@
.if ${MACHINE_CPUARCH} == "riscv"
SRCS+= instr_size.c
+DSRCS+= regs_riscv.d
.endif
YFLAGS+=-d
diff --git a/cddl/lib/libdtrace/regs_riscv.d b/cddl/lib/libdtrace/regs_riscv.d
new file mode 100644
--- /dev/null
+++ b/cddl/lib/libdtrace/regs_riscv.d
@@ -0,0 +1,74 @@
+/*
+ * SPDX-License-Identifier: CDDL 1.0
+ *
+ * Copyright 2023 Christos Margiolis <christos@FreeBSD.org>
+ */
+
+inline int R_ZERO = 0;
+#pragma D binding "1.13" R_ZERO
+inline int R_RA = 1;
+#pragma D binding "1.13" R_RA
+inline int R_SP = 2;
+#pragma D binding "1.13" R_SP
+inline int R_GP = 3;
+#pragma D binding "1.13" R_GP
+inline int R_TP = 4;
+#pragma D binding "1.13" R_TP
+inline int R_T0 = 5;
+#pragma D binding "1.13" R_T0
+inline int R_T1 = 6;
+#pragma D binding "1.13" R_T1
+inline int R_T2 = 7;
+#pragma D binding "1.13" R_T2
+inline int R_S0 = 8;
+#pragma D binding "1.13" R_S0
+inline int R_FP = 8;
+#pragma D binding "1.13" R_FP
+inline int R_S1 = 9;
+#pragma D binding "1.13" R_S1
+inline int R_A0 = 10;
+#pragma D binding "1.13" R_A0
+inline int R_A1 = 11;
+#pragma D binding "1.13" R_A1
+inline int R_A2 = 12;
+#pragma D binding "1.13" R_A2
+inline int R_A3 = 13;
+#pragma D binding "1.13" R_A3
+inline int R_A4 = 14;
+#pragma D binding "1.13" R_A4
+inline int R_A5 = 15;
+#pragma D binding "1.13" R_A5
+inline int R_A6 = 16;
+#pragma D binding "1.13" R_A6
+inline int R_A7 = 17;
+#pragma D binding "1.13" R_A7
+inline int R_S2 = 18;
+#pragma D binding "1.13" R_S2
+inline int R_S3 = 19;
+#pragma D binding "1.13" R_S3
+inline int R_S4 = 20;
+#pragma D binding "1.13" R_S4
+inline int R_S5 = 21;
+#pragma D binding "1.13" R_S5
+inline int R_S6 = 22;
+#pragma D binding "1.13" R_S6
+inline int R_S7 = 23;
+#pragma D binding "1.13" R_S7
+inline int R_S8 = 24;
+#pragma D binding "1.13" R_S8
+inline int R_S9 = 25;
+#pragma D binding "1.13" R_S9
+inline int R_S10 = 26;
+#pragma D binding "1.13" R_S10
+inline int R_S11 = 27;
+#pragma D binding "1.13" R_S11
+inline int R_T3 = 28;
+#pragma D binding "1.13" R_T3
+inline int R_T4 = 29;
+#pragma D binding "1.13" R_T4
+inline int R_T5 = 30;
+#pragma D binding "1.13" R_T5
+inline int R_T6 = 31;
+#pragma D binding "1.13" R_T6
+inline int R_PC = 32;
+#pragma D binding "1.13" R_PC
diff --git a/sys/cddl/dev/dtrace/riscv/dtrace_isa.c b/sys/cddl/dev/dtrace/riscv/dtrace_isa.c
--- a/sys/cddl/dev/dtrace/riscv/dtrace_isa.c
+++ b/sys/cddl/dev/dtrace/riscv/dtrace_isa.c
@@ -311,10 +311,34 @@
ulong_t
dtrace_getreg(struct trapframe *rp, uint_t reg)
{
-
- printf("IMPLEMENT ME: %s\n", __func__);
-
- return (0);
+ switch (reg) {
+ case REG_ZERO:
+ return (0);
+ case REG_RA:
+ return (rp->tf_ra);
+ case REG_SP:
+ return (rp->tf_sp);
+ case REG_GP:
+ return (rp->tf_gp);
+ case REG_TP:
+ return (rp->tf_tp);
+ case REG_T0 ... REG_T2:
+ return (rp->tf_t[reg - REG_T0]);
+ case REG_S0 ... REG_S1:
+ return (rp->tf_s[reg - REG_S0]);
+ case REG_A0 ... REG_A7:
+ return (rp->tf_a[reg - REG_A0]);
+ case REG_S2 ... REG_S11:
+ return (rp->tf_s[reg - REG_S2 + 2]);
+ case REG_T3 ... REG_T6:
+ return (rp->tf_t[reg - REG_T3 + 3]);
+ case REG_PC:
+ return (rp->tf_sepc);
+ default:
+ DTRACE_CPUFLAG_SET(CPU_DTRACE_ILLOP);
+ return (0);
+ }
+ /* NOTREACHED */
}
static int
diff --git a/sys/cddl/dev/dtrace/riscv/regset.h b/sys/cddl/dev/dtrace/riscv/regset.h
--- a/sys/cddl/dev/dtrace/riscv/regset.h
+++ b/sys/cddl/dev/dtrace/riscv/regset.h
@@ -42,7 +42,40 @@
extern "C" {
#endif
-/* Place here */
+#define REG_ZERO 0
+#define REG_RA 1
+#define REG_SP 2
+#define REG_GP 3
+#define REG_TP 4
+#define REG_T0 5
+#define REG_T1 6
+#define REG_T2 7
+#define REG_S0 8
+#define REG_FP 8
+#define REG_S1 9
+#define REG_A0 10
+#define REG_A1 11
+#define REG_A2 12
+#define REG_A3 13
+#define REG_A4 14
+#define REG_A5 15
+#define REG_A6 16
+#define REG_A7 17
+#define REG_S2 18
+#define REG_S3 19
+#define REG_S4 20
+#define REG_S5 21
+#define REG_S6 22
+#define REG_S7 23
+#define REG_S8 24
+#define REG_S9 25
+#define REG_S10 26
+#define REG_S11 27
+#define REG_T3 28
+#define REG_T4 29
+#define REG_T5 30
+#define REG_T6 31
+#define REG_PC 32
#ifdef __cplusplus
}

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