Add some integration tests and runner

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

run_asm_tests.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+here="$(dirname "$0")"
+cd "$here"
+
+tests="./tests"
+
+RED="\e[31m"
+GREEN="\e[32m"
+RESET="\e[0m"
+
+# Build project
+cargo build
+
+find "$tests" -type f -name '*.asm' | \
+while read fname; do
+    test_name="$(basename "${fname%.asm}")"
+    printf "%s ... " "$test_name"
+    cargo run --quiet "$fname"
+    exit_code="$?"
+    if (( "$exit_code" == 0 )); then
+        echo -e "${GREEN}OK${RESET}"
+    else
+        echo -e "${RED}FAIL${RESET} ($exit_code)"
+    fi
+done

tests/test_add.asm

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+.section data $0x0 {
+    number: .u8 $10
+
+    main:
+        ; Test addition
+        mov %status, $1
+        add %r0, $1
+        cmpeq %r0, $1
+        jz end
+
+        ; Test addition from a register
+        mov %status, $2
+        add %r0, %r0
+        cmpeq %r0, $2
+        jz end
+        
+        ; Test addition from a u8 location
+        mov %status, $3
+        add %r0, (number)u8
+        cmpeq %r0, $12
+        jz end
+
+        ; Test addition overflow
+        mov %status, $4
+        add %r0, $0xFFFFFFFFFFFFFFFF
+        cmpeq %r0, $11
+        jz end
+
+        mov %status, $0
+    end:
+        halt
+
+    .export main
+}
+
+.meta {
+    entry: main
+}

tests/test_div.asm

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+.section data $0x0 {
+    number: .u8 $10
+
+    main:
+        ; Test division
+        mov %status, $1
+        mov %r0, (number)u8
+        div %r0, $2
+        cmpeq %r0, $5
+        jz end
+
+        ; Test integer division
+        mov %status, $2
+        mov %r1, $2
+        div %r0, %r1
+        cmpeq %r0, $2
+        jz end
+        
+        ; Test negative division with idiv
+        mov %status, $3
+        idiv %r0, $0xFFFFFFFFFFFFFFFF        ; -1
+        cmpeq %r0, $0xFFFFFFFFFFFFFFFE      ; -2
+        jz end
+
+        mov %status, $0
+    end:
+        halt
+
+    .export main
+}
+
+.meta {
+    entry: main
+}

tests/test_mod.asm

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+.section data $0x0 {
+    number: .u8 $10
+
+    main:
+        ; Test modulo
+        mov %status, $1
+        mov %r0, (number)u8
+        mod $r0, $4
+        cmpeq %r0, $2
+        jz end
+
+        ; Test modulo from a register
+        mov %status, $2
+        add %r0, %r0
+        cmpeq %r0, $2
+        jz end
+        
+        ; Test mod by zero
+        mov %status, $4
+        add %r0, $0xFFFFFFFFFFFFFFFF
+        cmpeq %r0, $11
+        jz end
+
+        mov %status, $0
+    end:
+        halt
+
+    .export main
+}
+
+.meta {
+    entry: main
+}
+

tests/test_mul.asm

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+.section data $0x0 {
+    number: .u8 $10
+
+    main:
+        ; Test multiplication
+        mov %status, $1
+        mov %r0, (number)u8
+        mul %r0, $1
+        cmpeq %r0, $10
+        jz end
+
+        ; Test multiplication from a register
+        mov %status, $2
+        mov %r1, $2
+        mul %r0, %r1
+        cmpeq %r0, $20
+        jz end
+        
+        ; Test negative multiplication
+        mov %status, $3
+        mul %r0, $0xFFFFFFFFFFFFFFFF        ; -1
+        cmpeq %r0, $0xFFFFFFFFFFFFFFEC      ; -20
+        jz end
+
+        mov %status, $0
+    end:
+        halt
+
+    .export main
+}
+
+.meta {
+    entry: main
+}

tests/test_sub.asm

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+.section data $0x0 {
+    number: .u8 $10
+
+    main:
+        ; Test subtraction
+        mov %status, $1
+        mov %r0, (number)u8
+        sub %r0, $1
+        cmpeq %r0, $9
+        jz end
+
+        ; Test subtraction from a register
+        mov %status, $2
+        mov %r1, $2
+        sub %r0, %r1
+        cmpeq %r0, $7
+        jz end
+        
+        ; Test subtraction overflow
+        mov %status, $3
+        sub %r0, $8
+        cmpeq %r0, $0xFFFFFFFFFFFFFFFF
+        jz end
+
+        mov %status, $0
+    end:
+        halt
+
+    .export main
+}
+
+.meta {
+    entry: main
+}