Merge branch 'test_programs' into 'decode_print'

ONGOING: Test programs

See merge request simpleos/burritos!5

test_programs/Makefile

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+TOPDIR=.
+include $(TOPDIR)/Makefile.config
+
+# 
+# Main targets
+#
+objdumps:
+	$(MAKE) -C riscv_instructions
+
+programs:
+	$(MAKE) -C programs
+
+clean:
+	rm -rf $(TOPDIR)/target

test_programs/Makefile.config

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+# This is part of a GNU -*- Makefile -*-, to specify system-dependent 
+# parts of the Makefile enviroment.
+#
+# This gets included as part of the GNU-Makefile used in each of 
+# the subdirectories.
+#
+# Depending on your platform, you need to select the correct definition.
+
+## RISCV target compilation toolchain
+RISCV_PREFIX=/opt/riscv/bin/
+RISCV_AS = $(RISCV_PREFIX)riscv64-unknown-elf-gcc -x assembler-with-cpp -march=rv64imfd
+RISCV_GCC = $(RISCV_PREFIX)riscv64-unknown-elf-gcc
+RISCV_LD = $(RISCV_PREFIX)riscv64-unknown-elf-ld
+RISCV_OBJDUMP = $(RISCV_PREFIX)riscv64-unknown-elf-objdump
+RISCV_ASFLAGS = $(RISCV_CPPFLAGS)
+RISCV_CPPFLAGS = #nil
+RISCV_CFLAGS = -Wall $(RISCV_CPPFLAGS) -march=rv64imfd
+RISCV_LDFLAGS = #nil

test_programs/Makefile.objdumps

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+include $(TOPDIR)/Makefile.config
+
+COVERAGE = $(TOPDIR)/riscv_instructions
+
+AS  = $(RISCV_AS) -c
+GCC = $(RISCV_GCC)
+LD  = $(RISCV_LD)
+
+INCPATH += -I$(TOPDIR) -I$(COVERAGE)
+ASFLAGS  = $(RISCV_ASFLAGS) $(INCPATH)
+CFLAGS   = $(RISCV_CFLAGS) $(INCPATH)
+
+# Rules
+%.a:
+	$(AR) rcv $@ $^
+
+%.o: %.c
+	$(GCC) $(CFLAGS) -c $<
+
+%.o: %.s
+	$(AS) $(ASFLAGS) -c $<
+
+$(PROGRAMS):
+	$(LD) $+ -o $@

test_programs/README.md

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+# BurritOS Test programs
+This folder contains small C programs pertaining to the assessment of the correctness of BurritOS' behavior.
+
+## Folder Structure
+ - **riscv_instructions**: contains small programs for testing simulator instruction coverage.
+
+## How to build
+### In the Makefile.config file
+Set the variables to the correct paths for the [RISCV Newlib compilation toolchain](https://github.com/riscv-collab/riscv-gnu-toolchain). Simply changing the `RISCV_PREFIX` variable should do the trick. **Do not forget to add a trailing slash**.
+
+### Exporting objdumps
+
+```
+$ make objdumps
+```
+
+### Compiling programs
+```
+$ make programs
+```
+
+### Cleaning
+```
+$ make clean
+```
+
+### Output folder
+Compilation results are located in the target/objdumps and target/programs directories.

test_programs/riscv_instructions/Makefile

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+TOPDIR = ../
+include $(TOPDIR)/Makefile.objdumps

test_programs/riscv_instructions/boolean_logic/comparisons.c

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+int main() {
+    int x = 0;
+    int y = 1;
+    while (x <= y) {
+        if (x > y) {
+            x += 1;
+        } else if (x == y) {
+            x += y;
+        } else if (x < y) {
+            y += 1;
+        } else {
+            return;
+        }
+    }
+}

test_programs/riscv_instructions/boolean_logic/if.c

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+int main() {
+    int x = 1;
+    if (x == 1 && x > 0) {
+        x = 2;
+    } else if (x || x == 0 ) {
+        x = 3;
+    } else {
+        x = 0;
+    }
+}

test_programs/riscv_instructions/boolean_logic/switch.c

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+int main() {
+    int x = 0;
+    switch(1) {
+        case 1: x = 1; break;
+        default: return;
+    }
+}

test_programs/riscv_instructions/jump_instructions/jump.c

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+int test() {
+    return 1;
+}
+
+int main() {
+    int x = test();
+}

test_programs/riscv_instructions/jump_instructions/ret.c

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+int main() {
+    return 1;
+}

test_programs/riscv_instructions/simple_arithmerics/README.md

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+# Simple arithmetics program
+
+These allow to check whether the following instructions are correctly implemented.
+
+- addi
+- sd
+- sw
+- li
+- sw
+- lw
+- mv
+- addw
+- nop
+- ld
+- ret

test_programs/riscv_instructions/simple_arithmerics/unsigned_addition.c

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+// EXPECTS TWO VARIABLES WITH A VALUE OF UNSIGNED 1
+void main() {
+    unsigned int x = 0;
+    unsigned int y = 1;
+    x = x + y;
+}

test_programs/riscv_instructions/simple_arithmerics/unsigned_division.c

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+// Expecting two variables with a value of two
+void main() {
+    unsigned int x = 4;
+    unsigned int y = 2;
+    x = x / y;
+}

test_programs/riscv_instructions/simple_arithmerics/unsigned_multiplication.c

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+// EXPECTS TWO VARIABLES WITH A VALUE OF UNSIGNED 2
+void main() {
+    unsigned int x = 1;
+    unsigned int y = 2;
+    x = x * y;
+}

test_programs/riscv_instructions/simple_arithmerics/unsigned_substraction.c

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+// EXPECTS TWO VARIABLES WITH A VALUE OF UNSIGNED 1
+void main() {
+    unsigned int x = 1;
+    unsigned int y = 1;
+    x = x - y;
+}