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[Atomics] Fix disassembly for ia32 xchg_b and xchg_w

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https://codereview.chromium.org/1938213002 added xchg_b and xchg_w, but didn't
add it to the disassembler, and there were no tests that caught it.

BUG=v8:4614
TBR=bmeurer@chromium.org
LOG=n

Review-Url: https://codereview.chromium.org/1947673002
Cr-Commit-Position: refs/heads/master@{#35998}
This commit is contained in:
binji 2016-05-03 12:58:22 -07:00 committed by Commit bot
parent 4930a16ed3
commit af677d7b34
1 changed files with 20 additions and 12 deletions
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32
src/ia32/disasm-ia32.cc
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@ -30,18 +30,19 @@ struct ByteMnemonic {
};
static const ByteMnemonic two_operands_instr[] = {
{0x01, "add", OPER_REG_OP_ORDER}, {0x03, "add", REG_OPER_OP_ORDER},
{0x09, "or", OPER_REG_OP_ORDER}, {0x0B, "or", REG_OPER_OP_ORDER},
{0x13, "adc", REG_OPER_OP_ORDER}, {0x1B, "sbb", REG_OPER_OP_ORDER},
{0x21, "and", OPER_REG_OP_ORDER}, {0x23, "and", REG_OPER_OP_ORDER},
{0x29, "sub", OPER_REG_OP_ORDER}, {0x2A, "subb", REG_OPER_OP_ORDER},
{0x2B, "sub", REG_OPER_OP_ORDER}, {0x31, "xor", OPER_REG_OP_ORDER},
{0x33, "xor", REG_OPER_OP_ORDER}, {0x38, "cmpb", OPER_REG_OP_ORDER},
{0x39, "cmp", OPER_REG_OP_ORDER}, {0x3A, "cmpb", REG_OPER_OP_ORDER},
{0x3B, "cmp", REG_OPER_OP_ORDER}, {0x84, "test_b", REG_OPER_OP_ORDER},
{0x85, "test", REG_OPER_OP_ORDER}, {0x87, "xchg", REG_OPER_OP_ORDER},
{0x8A, "mov_b", REG_OPER_OP_ORDER}, {0x8B, "mov", REG_OPER_OP_ORDER},
{0x8D, "lea", REG_OPER_OP_ORDER}, {-1, "", UNSET_OP_ORDER}};
{0x01, "add", OPER_REG_OP_ORDER}, {0x03, "add", REG_OPER_OP_ORDER},
{0x09, "or", OPER_REG_OP_ORDER}, {0x0B, "or", REG_OPER_OP_ORDER},
{0x13, "adc", REG_OPER_OP_ORDER}, {0x1B, "sbb", REG_OPER_OP_ORDER},
{0x21, "and", OPER_REG_OP_ORDER}, {0x23, "and", REG_OPER_OP_ORDER},
{0x29, "sub", OPER_REG_OP_ORDER}, {0x2A, "subb", REG_OPER_OP_ORDER},
{0x2B, "sub", REG_OPER_OP_ORDER}, {0x31, "xor", OPER_REG_OP_ORDER},
{0x33, "xor", REG_OPER_OP_ORDER}, {0x38, "cmpb", OPER_REG_OP_ORDER},
{0x39, "cmp", OPER_REG_OP_ORDER}, {0x3A, "cmpb", REG_OPER_OP_ORDER},
{0x3B, "cmp", REG_OPER_OP_ORDER}, {0x84, "test_b", REG_OPER_OP_ORDER},
{0x85, "test", REG_OPER_OP_ORDER}, {0x86, "xchg_b", REG_OPER_OP_ORDER},
{0x87, "xchg", REG_OPER_OP_ORDER}, {0x8A, "mov_b", REG_OPER_OP_ORDER},
{0x8B, "mov", REG_OPER_OP_ORDER}, {0x8D, "lea", REG_OPER_OP_ORDER},
{-1, "", UNSET_OP_ORDER}};
static const ByteMnemonic zero_operands_instr[] = {
{0xC3, "ret", UNSET_OP_ORDER},
@ -1607,6 +1608,13 @@ int DisassemblerIA32::InstructionDecode(v8::internal::Vector<char> out_buffer,
} else if (*data == 0x8B) {
data++;
data += PrintOperands("mov_w", REG_OPER_OP_ORDER, data);
} else if (*data == 0x87) {
data++;
int mod, regop, rm;
get_modrm(*data, &mod, &regop, &rm);
AppendToBuffer("xchg_w ");
data += PrintRightOperand(data);
AppendToBuffer(",%s", NameOfCPURegister(regop));
} else if (*data == 0x89) {
data++;
int mod, regop, rm;