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author | Kartik K. Agaram <vc@akkartik.com> | 2017-10-13 00:54:59 -0700 |
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committer | Kartik K. Agaram <vc@akkartik.com> | 2017-10-13 00:54:59 -0700 |
commit | 280f5115465501464b2f7e9f4671f9e8f3b52147 (patch) | |
tree | edf239245638eb309e63660ffea39af4ebff6962 /subx/012indirect_addressing.cc | |
parent | 7a219c68bae6dbe214aec69a051015e851e32400 (diff) | |
download | mu-280f5115465501464b2f7e9f4671f9e8f3b52147.tar.gz |
4055
subx: Implement 'and' for the addressing modes we've built so far.
Diffstat (limited to 'subx/012indirect_addressing.cc')
-rw-r--r-- | subx/012indirect_addressing.cc | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/subx/012indirect_addressing.cc b/subx/012indirect_addressing.cc index f9aafda5..6e9a5f01 100644 --- a/subx/012indirect_addressing.cc +++ b/subx/012indirect_addressing.cc @@ -79,3 +79,40 @@ case 0x2b: { // subtract r/m32 from r32 BINARY_ARITHMETIC_OP(-, Reg[arg1].i, *arg2); break; } + +//:: and + +:(scenario and_r32_with_mem_at_r32) +% Reg[0].i = 0x60; +% Mem.at(0x60) = 0x0d; +% Mem.at(0x61) = 0x0c; +% Mem.at(0x62) = 0x0b; +% Mem.at(0x63) = 0x0a; +% Reg[3].i = 0xff; +# op ModRM SIB displacement immediate + 21 18 # and EBX (reg 3) with *EAX (reg 0) ++run: and reg 3 with effective address ++run: effective address is mem at address 0x60 (reg 0) ++run: storing 0x0000000d + +//: + +:(scenario and_mem_at_r32_with_r32) +% Reg[0].i = 0x60; +% Mem.at(0x60) = 0xff; +% Reg[3].i = 0x0a0b0c0d; +# op ModRM SIB displacement immediate + 23 18 # and *EAX (reg 0) with EBX (reg 3) ++run: and effective address with reg 3 ++run: effective address is mem at address 0x60 (reg 0) ++run: storing 0x0000000d + +:(before "End Single-Byte Opcodes") +case 0x23: { // and r/m32 with r32 + uint8_t modrm = next(); + uint8_t arg1 = (modrm>>3)&0x7; + trace(2, "run") << "and effective address with reg " << NUM(arg1) << end(); + const int32_t* arg2 = effective_address(modrm); + BINARY_BITWISE_OP(&, Reg[arg1].u, *arg2); + break; +} |