diff options
| -rw-r--r-- | subx/015immediate_addressing.cc | 152 |
1 files changed, 135 insertions, 17 deletions
diff --git a/subx/015immediate_addressing.cc b/subx/015immediate_addressing.cc index eedf81a3..7c0da1a0 100644 --- a/subx/015immediate_addressing.cc +++ b/subx/015immediate_addressing.cc @@ -82,7 +82,7 @@ void test_add_imm32_to_r32() { "== 0x1\n" // code segment // op ModR/M SIB displacement immediate " 81 c3 0a 0b 0c 0d\n" // add 0x0d0c0b0a to EBX - // ModR/M in binary: 11 (direct mode) 000 (add imm32) 011 (dest EBX) + // ModR/M in binary: 11 (direct mode) 000 (subop add) 011 (dest EBX) ); CHECK_TRACE_CONTENTS( "run: combine imm32 with r/m32\n" @@ -128,6 +128,61 @@ case 0x81: { // combine imm32 with r/m32 break; } +:(code) +void test_add_imm32_to_r32_signed_overflow() { + Reg[EBX].i = 0x7fffffff; // largest positive signed integer + run( + "== 0x1\n" // code segment + // op ModR/M SIB displacement immediate + " 81 c3 01 00 00 00\n" // add 1 to EBX + // ModR/M in binary: 11 (direct mode) 000 (subop add) 011 (dest EBX) + ); + CHECK_TRACE_CONTENTS( + "run: combine imm32 with r/m32\n" + "run: r/m32 is EBX\n" + "run: imm32 is 0x00000001\n" + "run: subop add\n" + "run: SF=1; ZF=0; CF=0; OF=1\n" + "run: storing 0x80000000\n" + ); +} + +void test_add_imm32_to_r32_unsigned_overflow() { + Reg[EBX].u = 0xffffffff; // largest unsigned number + run( + "== 0x1\n" // code segment + // op ModR/M SIB displacement immediate + " 81 c3 01 00 00 00\n" // add 1 to EBX + // ModR/M in binary: 11 (direct mode) 011 (subop add) 011 (dest EBX) + ); + CHECK_TRACE_CONTENTS( + "run: combine imm32 with r/m32\n" + "run: r/m32 is EBX\n" + "run: imm32 is 0x00000001\n" + "run: subop add\n" + "run: SF=0; ZF=1; CF=1; OF=0\n" + "run: storing 0x00000000\n" + ); +} + +void test_add_imm32_to_r32_unsigned_and_signed_overflow() { + Reg[EBX].u = 0x80000000; // smallest negative signed integer + run( + "== 0x1\n" // code segment + // op ModR/M SIB displacement immediate + " 81 c3 00 00 00 80\n" // add 0x80000000 to EBX + // ModR/M in binary: 11 (direct mode) 011 (subop add) 011 (dest EBX) + ); + CHECK_TRACE_CONTENTS( + "run: combine imm32 with r/m32\n" + "run: r/m32 is EBX\n" + "run: imm32 is 0x80000000\n" + "run: subop add\n" + "run: SF=0; ZF=1; CF=1; OF=1\n" + "run: storing 0x00000000\n" + ); +} + //: :(code) @@ -137,7 +192,7 @@ void test_add_imm32_to_mem_at_r32() { "== 0x1\n" // code segment // op ModR/M SIB displacement immediate " 81 03 0a 0b 0c 0d \n" // add 0x0d0c0b0a to *EBX - // ModR/M in binary: 00 (indirect mode) 000 (add imm32) 011 (dest EBX) + // ModR/M in binary: 00 (indirect mode) 000 (subop add) 011 (dest EBX) "== 0x2000\n" // data segment "01 00 00 00\n" // 0x00000001 ); @@ -198,7 +253,7 @@ void test_subtract_imm32_from_mem_at_r32() { "== 0x1\n" // code segment // op ModR/M SIB displacement immediate " 81 2b 01 00 00 00 \n" // subtract 1 from *EBX - // ModR/M in binary: 00 (indirect mode) 101 (subtract imm32) 011 (dest EBX) + // ModR/M in binary: 00 (indirect mode) 101 (subop subtract) 011 (dest EBX) "== 0x2000\n" // data segment "0a 00 00 00\n" // 0x0000000a ); @@ -231,16 +286,79 @@ case 5: { break; } +:(code) +void test_subtract_imm32_from_mem_at_r32_signed_overflow() { + Reg[EBX].i = 0x2000; + run( + "== 0x1\n" // code segment + // op ModR/M SIB displacement immediate + " 81 2b ff ff ff 7f \n" // subtract largest positive signed integer from *EBX + // ModR/M in binary: 00 (indirect mode) 101 (subop subtract) 011 (dest EBX) + "== 0x2000\n" // data segment + "00 00 00 80\n" // smallest negative signed integer + ); + CHECK_TRACE_CONTENTS( + "run: combine imm32 with r/m32\n" + "run: effective address is 0x00002000 (EBX)\n" + "run: effective address contains 80000000\n" + "run: imm32 is 0x7fffffff\n" + "run: subop subtract\n" + "run: SF=0; ZF=0; CF=0; OF=1\n" + "run: storing 0x00000001\n" + ); +} + +void test_subtract_imm32_from_mem_at_r32_unsigned_overflow() { + Reg[EBX].i = 0x2000; + run( + "== 0x1\n" // code segment + // op ModR/M SIB displacement immediate + " 81 2b 01 00 00 00 \n" // subtract 1 from *EBX + // ModR/M in binary: 00 (indirect mode) 101 (subop subtract) 011 (dest EBX) + "== 0x2000\n" // data segment + "00 00 00 00\n" // 0 + ); + CHECK_TRACE_CONTENTS( + "run: combine imm32 with r/m32\n" + "run: effective address is 0x00002000 (EBX)\n" + "run: effective address contains 0\n" + "run: imm32 is 0x00000001\n" + "run: subop subtract\n" + "run: SF=1; ZF=0; CF=1; OF=0\n" + "run: storing 0xffffffff\n" + ); +} + +void test_subtract_imm32_from_mem_at_r32_signed_and_unsigned_overflow() { + Reg[EBX].i = 0x2000; + run( + "== 0x1\n" // code segment + // op ModR/M SIB displacement immediate + " 81 2b 00 00 00 80 \n" // subtract smallest negative signed integer from *EBX + // ModR/M in binary: 00 (indirect mode) 101 (subop subtract) 011 (dest EBX) + "== 0x2000\n" // data segment + "00 00 00 00\n" // 0 + ); + CHECK_TRACE_CONTENTS( + "run: combine imm32 with r/m32\n" + "run: effective address is 0x00002000 (EBX)\n" + "run: effective address contains 0\n" + "run: imm32 is 0x80000000\n" + "run: subop subtract\n" + "run: SF=1; ZF=0; CF=1; OF=1\n" + "run: storing 0x80000000\n" + ); +} + //: -:(code) void test_subtract_imm32_from_r32() { Reg[EBX].i = 10; run( "== 0x1\n" // code segment // op ModR/M SIB displacement immediate " 81 eb 01 00 00 00 \n" // subtract 1 from EBX - // ModR/M in binary: 11 (direct mode) 101 (subtract imm32) 011 (dest EBX) + // ModR/M in binary: 11 (direct mode) 101 (subop subtract) 011 (dest EBX) ); CHECK_TRACE_CONTENTS( "run: combine imm32 with r/m32\n" @@ -487,7 +605,7 @@ void test_and_imm32_with_mem_at_r32() { "== 0x1\n" // code segment // op ModR/M SIB displacement immediate " 81 23 0a 0b 0c 0d \n" // and 0x0d0c0b0a with *EBX - // ModR/M in binary: 00 (indirect mode) 100 (and imm32) 011 (dest EBX) + // ModR/M in binary: 00 (indirect mode) 100 (subop and) 011 (dest EBX) "== 0x2000\n" // data segment "ff 00 00 00\n" // 0x000000ff ); @@ -524,7 +642,7 @@ void test_and_imm32_with_r32() { "== 0x1\n" // code segment // op ModR/M SIB displacement immediate " 81 e3 0a 0b 0c 0d \n" // and 0x0d0c0b0a with EBX - // ModR/M in binary: 11 (direct mode) 100 (and imm32) 011 (dest EBX) + // ModR/M in binary: 11 (direct mode) 100 (subop and) 011 (dest EBX) ); CHECK_TRACE_CONTENTS( "run: combine imm32 with r/m32\n" @@ -579,7 +697,7 @@ void test_or_imm32_with_mem_at_r32() { "== 0x1\n" // code segment // op ModR/M SIB displacement immediate " 81 0b 0a 0b 0c 0d \n" // or 0x0d0c0b0a with *EBX - // ModR/M in binary: 00 (indirect mode) 001 (or imm32) 011 (dest EBX) + // ModR/M in binary: 00 (indirect mode) 001 (subop or) 011 (dest EBX) "== 0x2000\n" // data segment "a0 b0 c0 d0\n" // 0xd0c0b0a0 ); @@ -614,7 +732,7 @@ void test_or_imm32_with_r32() { "== 0x1\n" // code segment // op ModR/M SIB displacement immediate " 81 cb 0a 0b 0c 0d \n" // or 0x0d0c0b0a with EBX - // ModR/M in binary: 11 (direct mode) 001 (or imm32) 011 (dest EBX) + // ModR/M in binary: 11 (direct mode) 001 (subop or) 011 (dest EBX) ); CHECK_TRACE_CONTENTS( "run: combine imm32 with r/m32\n" @@ -669,7 +787,7 @@ void test_xor_imm32_with_mem_at_r32() { "== 0x1\n" // code segment // op ModR/M SIB displacement immediate " 81 33 0a 0b 0c 0d \n" // xor 0x0d0c0b0a with *EBX - // ModR/M in binary: 00 (indirect mode) 110 (xor imm32) 011 (dest EBX) + // ModR/M in binary: 00 (indirect mode) 110 (subop xor) 011 (dest EBX) "== 0x2000\n" // data segment "a0 b0 c0 d0\n" // 0xd0c0b0a0 ); @@ -704,7 +822,7 @@ void test_xor_imm32_with_r32() { "== 0x1\n" // code segment // op ModR/M SIB displacement immediate " 81 f3 0a 0b 0c 0d \n" // xor 0x0d0c0b0a with EBX - // ModR/M in binary: 11 (direct mode) 110 (xor imm32) 011 (dest EBX) + // ModR/M in binary: 11 (direct mode) 110 (subop xor) 011 (dest EBX) ); CHECK_TRACE_CONTENTS( "run: combine imm32 with r/m32\n" @@ -788,7 +906,7 @@ void test_compare_imm32_with_r32_greater() { "== 0x1\n" // code segment // op ModR/M SIB displacement immediate " 81 fb 07 0b 0c 0d \n" // compare 0x0d0c0b07 with EBX - // ModR/M in binary: 11 (direct mode) 111 (compare imm32) 011 (dest EBX) + // ModR/M in binary: 11 (direct mode) 111 (subop compare) 011 (dest EBX) ); CHECK_TRACE_CONTENTS( "run: combine imm32 with r/m32\n" @@ -817,7 +935,7 @@ void test_compare_imm32_with_r32_lesser() { "== 0x1\n" // code segment // op ModR/M SIB displacement immediate " 81 fb 0a 0b 0c 0d \n" // compare 0x0d0c0b0a with EBX - // ModR/M in binary: 11 (direct mode) 111 (compare imm32) 011 (dest EBX) + // ModR/M in binary: 11 (direct mode) 111 (subop compare) 011 (dest EBX) ); CHECK_TRACE_CONTENTS( "run: combine imm32 with r/m32\n" @@ -834,7 +952,7 @@ void test_compare_imm32_with_r32_equal() { "== 0x1\n" // code segment // op ModR/M SIB displacement immediate " 81 fb 0a 0b 0c 0d \n" // compare 0x0d0c0b0a with EBX - // ModR/M in binary: 11 (direct mode) 111 (compare imm32) 011 (dest EBX) + // ModR/M in binary: 11 (direct mode) 111 (subop compare) 011 (dest EBX) ); CHECK_TRACE_CONTENTS( "run: combine imm32 with r/m32\n" @@ -851,7 +969,7 @@ void test_compare_imm32_with_mem_at_r32_greater() { "== 0x1\n" // code segment // op ModR/M SIB displacement immediate " 81 3b 07 0b 0c 0d \n" // compare 0x0d0c0b07 with *EBX - // ModR/M in binary: 00 (indirect mode) 111 (compare imm32) 011 (dest EBX) + // ModR/M in binary: 00 (indirect mode) 111 (subop compare) 011 (dest EBX) "== 0x2000\n" // data segment "0a 0b 0c 0d\n" // 0x0d0c0b0a ); @@ -870,7 +988,7 @@ void test_compare_imm32_with_mem_at_r32_lesser() { "== 0x1\n" // code segment // op ModR/M SIB displacement immediate " 81 3b 0a 0b 0c 0d \n" // compare 0x0d0c0b0a with *EBX - // ModR/M in binary: 00 (indirect mode) 111 (compare imm32) 011 (dest EBX) + // ModR/M in binary: 00 (indirect mode) 111 (subop compare) 011 (dest EBX) "== 0x2000\n" // data segment "07 0b 0c 0d\n" // 0x0d0c0b07 ); @@ -890,7 +1008,7 @@ void test_compare_imm32_with_mem_at_r32_equal() { "== 0x1\n" // code segment // op ModR/M SIB displacement immediate " 81 3b 0a 0b 0c 0d \n" // compare 0x0d0c0b0a with *EBX - // ModR/M in binary: 00 (indirect mode) 111 (compare imm32) 011 (dest EBX) + // ModR/M in binary: 00 (indirect mode) 111 (subop compare) 011 (dest EBX) "== 0x2000\n" // data segment "0a 0b 0c 0d\n" // 0x0d0c0b0a ); |