Merged various testbench changes from compressed ISA branch

Makefile

@@ -4,6 +4,7 @@ FIRMWARE_OBJS = firmware/start.o firmware/irq.o firmware/print.o firmware/sieve.
 GCC_WARNS  = -Werror -Wall -Wextra -Wshadow -Wundef -Wpointer-arith -Wcast-qual -Wcast-align -Wwrite-strings
 GCC_WARNS += -Wredundant-decls -Wstrict-prototypes -Wmissing-prototypes -pedantic # -Wconversion
 TOOLCHAIN_PREFIX = riscv32-unknown-elf-
+# COMPRESSED_ISA = C
 
 test: testbench.exe firmware/firmware.hex
 	vvp -N testbench.exe
@@ -33,15 +34,15 @@ test_synth: testbench_synth.exe firmware/firmware.hex
 	vvp -N testbench_synth.exe
 
 testbench.exe: testbench.v picorv32.v
-	iverilog -o testbench.exe testbench.v picorv32.v
+	iverilog -o testbench.exe $(subst $(COMPRESSED_ISA),C,-DCOMPRESSED_ISA) testbench.v picorv32.v
 	chmod -x testbench.exe
 
 testbench_sp.exe: testbench.v picorv32.v
-	iverilog -o testbench_sp.exe -DSP_TEST testbench.v picorv32.v
+	iverilog -o testbench_sp.exe $(subst $(COMPRESSED_ISA),C,-DCOMPRESSED_ISA) -DSP_TEST testbench.v picorv32.v
 	chmod -x testbench_sp.exe
 
 testbench_axi.exe: testbench.v picorv32.v
-	iverilog -o testbench_axi.exe -DAXI_TEST testbench.v picorv32.v
+	iverilog -o testbench_axi.exe $(subst $(COMPRESSED_ISA),C,-DCOMPRESSED_ISA) -DAXI_TEST testbench.v picorv32.v
 	chmod -x testbench_axi.exe
 
 testbench_synth.exe: testbench.v synth.v
@@ -65,10 +66,10 @@ firmware/firmware.elf: $(FIRMWARE_OBJS) $(TEST_OBJS) firmware/sections.lds
 	chmod -x $@
 
 firmware/start.o: firmware/start.S
-	$(TOOLCHAIN_PREFIX)gcc -c -m32 -march=RV32IMXcustom -o $@ $<
+	$(TOOLCHAIN_PREFIX)gcc -c -m32 -march=RV32IM$(COMPRESSED_ISA)Xcustom -o $@ $<
 
 firmware/%.o: firmware/%.c
-	$(TOOLCHAIN_PREFIX)gcc -c -m32 -march=RV32I -Os --std=c99 $(GCC_WARNS) -ffreestanding -nostdlib -o $@ $<
+	$(TOOLCHAIN_PREFIX)gcc -c -m32 -march=RV32I$(COMPRESSED_ISA) -Os --std=c99 $(GCC_WARNS) -ffreestanding -nostdlib -o $@ $<
 
 tests/%.o: tests/%.S tests/riscv_test.h tests/test_macros.h
 	$(TOOLCHAIN_PREFIX)gcc -c -m32 -march=RV32IM -o $@ -DTEST_FUNC_NAME=$(notdir $(basename $<)) \

firmware/firmware.h

@@ -18,7 +18,7 @@ uint32_t *irq(uint32_t *regs, uint32_t irqs);
 void print_chr(char ch);
 void print_str(const char *p);
 void print_dec(unsigned int val);
-void print_hex(unsigned int val);
+void print_hex(unsigned int val, int digits);
 
 // sieve.c
 void sieve(void);

firmware/irq.c

@@ -31,30 +31,31 @@ uint32_t *irq(uint32_t *regs, uint32_t irqs)
 	if ((irqs & 6) != 0)
 	{
 		uint32_t pc = regs[0] - 4;
-		uint32_t instr = *(uint32_t*)pc;
+		uint16_t *instr_hwords = (uint16_t*)pc;
+		uint32_t instr = instr_hwords[0] | (instr_hwords[1] << 16);
 
 		print_str("\n");
 		print_str("------------------------------------------------------------\n");
 
 		if ((irqs & 2) != 0) {
-			if (instr == 0x00100073) {
+			if (instr == 0x00100073 || (instr & 0xffff) == 9002) {
 				print_str("SBREAK instruction at 0x");
-				print_hex(pc);
+				print_hex(pc, 8);
 				print_str("\n");
 			} else {
 				print_str("Illegal Instruction at 0x");
-				print_hex(pc);
+				print_hex(pc, 8);
 				print_str(": 0x");
-				print_hex(instr);
+				print_hex(instr, ((instr & 3) == 3) ? 8 : 4);
 				print_str("\n");
 			}
 		}
 
 		if ((irqs & 4) != 0) {
 			print_str("Bus error in Instruction at 0x");
-			print_hex(pc);
+			print_hex(pc, 8);
 			print_str(": 0x");
-			print_hex(instr);
+			print_hex(instr, ((instr & 3) == 3) ? 8 : 4);
 			print_str("\n");
 		}
 
@@ -90,7 +91,7 @@ uint32_t *irq(uint32_t *regs, uint32_t irqs)
 				print_chr(' ');
 			}
 
-			print_hex(regs[r]);
+			print_hex(regs[r], 8);
 			print_str(k == 3 ? "\n" : "    ");
 		}
 

firmware/multest.c

@@ -26,51 +26,51 @@ void multest(void)
 		int64_t as = (int32_t)a, bs = (int32_t)b;
 
 		print_str("input [");
-		print_hex(as >> 32);
+		print_hex(as >> 32, 8);
 		print_str("] ");
-		print_hex(a);
+		print_hex(a, 8);
 		print_str(" [");
-		print_hex(bs >> 32);
+		print_hex(bs >> 32, 8);
 		print_str("] ");
-		print_hex(b);
+		print_hex(b, 8);
 		print_chr('\n');
 
 		uint32_t h_mul, h_mulh, h_mulhsu, h_mulhu;
 		print_str("hard   ");
 
 		h_mul = hard_mul(a, b);
-		print_hex(h_mul);
+		print_hex(h_mul, 8);
 		print_str("  ");
 
 		h_mulh = hard_mulh(a, b);
-		print_hex(h_mulh);
+		print_hex(h_mulh, 8);
 		print_str("  ");
 
 		h_mulhsu = hard_mulhsu(a, b);
-		print_hex(h_mulhsu);
+		print_hex(h_mulhsu, 8);
 		print_str("  ");
 
 		h_mulhu = hard_mulhu(a, b);
-		print_hex(h_mulhu);
+		print_hex(h_mulhu, 8);
 		print_chr('\n');
 
 		uint32_t s_mul, s_mulh, s_mulhsu, s_mulhu;
 		print_str("soft   ");
 
 		s_mul = a * b;
-		print_hex(s_mul);
+		print_hex(s_mul, 8);
 		print_str("  ");
 
 		s_mulh = (as * bs) >> 32;
-		print_hex(s_mulh);
+		print_hex(s_mulh, 8);
 		print_str("  ");
 
 		s_mulhsu = (as * bu) >> 32;
-		print_hex(s_mulhsu);
+		print_hex(s_mulhsu, 8);
 		print_str("  ");
 
 		s_mulhu = (au * bu) >> 32;
-		print_hex(s_mulhu);
+		print_hex(s_mulhu, 8);
 		print_str("  ");
 
 		if (s_mul != h_mul || s_mulh != h_mulh || s_mulhsu != h_mulhsu || s_mulhu != h_mulhu) {

firmware/print.c

@@ -33,9 +33,9 @@ void print_dec(unsigned int val)
 	}
 }
 
-void print_hex(unsigned int val)
+void print_hex(unsigned int val, int digits)
 {
-	for (int i = 32-4; i >= 0; i -= 4)
+	for (int i = (4*digits)-4; i >= 0; i -= 4)
 		*((volatile uint32_t*)OUTPORT) = "0123456789ABCDEF"[(val >> i) % 16];
 }
 

firmware/sieve.c

@@ -72,7 +72,7 @@ void sieve(void)
 	}
 
 	print_str("checksum: ");
-	print_hex(hash);
+	print_hex(hash, 8);
 
 	if (hash == 0x1772A48F) {
 		print_str(" OK\n");

testbench.v

@@ -7,7 +7,6 @@
 
 `timescale 1 ns / 1 ps
 // `define VERBOSE
-// `define AXI_TEST
 
 module testbench;