Index: head/lib/libproc/proc_bkpt.c
===================================================================
--- head/lib/libproc/proc_bkpt.c
+++ head/lib/libproc/proc_bkpt.c
@@ -61,6 +61,9 @@
 #elif defined(__powerpc__)
 #define	BREAKPOINT_INSTR	0x7fe00008	/* trap */
 #define	BREAKPOINT_INSTR_SZ	4
+#elif defined(__riscv__)
+#define	BREAKPOINT_INSTR	0x00100073	/* sbreak */
+#define	BREAKPOINT_INSTR_SZ	4
 #else
 #error "Add support for your architecture"
 #endif
Index: head/lib/libproc/proc_regs.c
===================================================================
--- head/lib/libproc/proc_regs.c
+++ head/lib/libproc/proc_regs.c
@@ -66,6 +66,8 @@
 		*regvalue = regs.r_regs[PC];
 #elif defined(__powerpc__)
 		*regvalue = regs.pc;
+#elif defined(__riscv__)
+		*regvalue = regs.sepc;
 #endif
 		break;
 	case REG_SP:
@@ -81,6 +83,8 @@
 		*regvalue = regs.r_regs[SP];
 #elif defined(__powerpc__)
 		*regvalue = regs.fixreg[1];
+#elif defined(__riscv__)
+		*regvalue = regs.sp;
 #endif
 		break;
 	default:
@@ -117,6 +121,8 @@
 		regs.r_regs[PC] = regvalue;
 #elif defined(__powerpc__)
 		regs.pc = regvalue;
+#elif defined(__riscv__)
+		regs.sepc = regvalue;
 #endif
 		break;
 	case REG_SP:
@@ -132,6 +138,8 @@
 		regs.r_regs[PC] = regvalue;
 #elif defined(__powerpc__)
 		regs.fixreg[1] = regvalue;
+#elif defined(__riscv__)
+		regs.sp = regvalue;
 #endif
 		break;
 	default: