mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-04 06:09:05 +00:00
Simplify a bunch of code by removing the need for the x86 disassembler table builder to know about extended opcodes. The modrm forms are sufficient to convey the information.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201060 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper
parent
d8fdb19a7f
commit
a73f0e2d49
@ -96,82 +96,8 @@ namespace X86Local {
|
||||
};
|
||||
}
|
||||
|
||||
// If rows are added to the opcode extension tables, then corresponding entries
|
||||
// must be added here.
|
||||
//
|
||||
// If the row corresponds to a single byte (i.e., 8f), then add an entry for
|
||||
// that byte to ONE_BYTE_EXTENSION_TABLES.
|
||||
//
|
||||
// If the row corresponds to two bytes where the first is 0f, add an entry for
|
||||
// the second byte to TWO_BYTE_EXTENSION_TABLES.
|
||||
//
|
||||
// If the row corresponds to some other set of bytes, you will need to modify
|
||||
// the code in RecognizableInstr::emitDecodePath() as well, and add new prefixes
|
||||
// to the X86 TD files, except in two cases: if the first two bytes of such a
|
||||
// new combination are 0f 38 or 0f 3a, you just have to add maps called
|
||||
// THREE_BYTE_38_EXTENSION_TABLES and THREE_BYTE_3A_EXTENSION_TABLES and add a
|
||||
// switch(Opcode) just below the case X86Local::T8: or case X86Local::TA: line
|
||||
// in RecognizableInstr::emitDecodePath().
|
||||
|
||||
#define ONE_BYTE_EXTENSION_TABLES \
|
||||
EXTENSION_TABLE(80) \
|
||||
EXTENSION_TABLE(81) \
|
||||
EXTENSION_TABLE(82) \
|
||||
EXTENSION_TABLE(83) \
|
||||
EXTENSION_TABLE(8f) \
|
||||
EXTENSION_TABLE(c0) \
|
||||
EXTENSION_TABLE(c1) \
|
||||
EXTENSION_TABLE(c6) \
|
||||
EXTENSION_TABLE(c7) \
|
||||
EXTENSION_TABLE(d0) \
|
||||
EXTENSION_TABLE(d1) \
|
||||
EXTENSION_TABLE(d2) \
|
||||
EXTENSION_TABLE(d3) \
|
||||
EXTENSION_TABLE(f6) \
|
||||
EXTENSION_TABLE(f7) \
|
||||
EXTENSION_TABLE(fe) \
|
||||
EXTENSION_TABLE(ff)
|
||||
|
||||
#define TWO_BYTE_EXTENSION_TABLES \
|
||||
EXTENSION_TABLE(00) \
|
||||
EXTENSION_TABLE(01) \
|
||||
EXTENSION_TABLE(0d) \
|
||||
EXTENSION_TABLE(18) \
|
||||
EXTENSION_TABLE(71) \
|
||||
EXTENSION_TABLE(72) \
|
||||
EXTENSION_TABLE(73) \
|
||||
EXTENSION_TABLE(ae) \
|
||||
EXTENSION_TABLE(ba) \
|
||||
EXTENSION_TABLE(c7)
|
||||
|
||||
#define THREE_BYTE_38_EXTENSION_TABLES \
|
||||
EXTENSION_TABLE(F3)
|
||||
|
||||
#define XOP9_MAP_EXTENSION_TABLES \
|
||||
EXTENSION_TABLE(01) \
|
||||
EXTENSION_TABLE(02)
|
||||
|
||||
using namespace X86Disassembler;
|
||||
|
||||
/// needsModRMForDecode - Indicates whether a particular instruction requires a
|
||||
/// ModR/M byte for the instruction to be properly decoded. For example, a
|
||||
/// MRMDestReg instruction needs the Mod field in the ModR/M byte to be set to
|
||||
/// 0b11.
|
||||
///
|
||||
/// @param form - The form of the instruction.
|
||||
/// @return - true if the form implies that a ModR/M byte is required, false
|
||||
/// otherwise.
|
||||
static bool needsModRMForDecode(uint8_t form) {
|
||||
return (form == X86Local::MRMDestReg ||
|
||||
form == X86Local::MRMDestMem ||
|
||||
form == X86Local::MRMSrcReg ||
|
||||
form == X86Local::MRMSrcMem ||
|
||||
form == X86Local::MRMXr ||
|
||||
form == X86Local::MRMXm ||
|
||||
(form >= X86Local::MRM0r && form <= X86Local::MRM7r) ||
|
||||
(form >= X86Local::MRM0m && form <= X86Local::MRM7m));
|
||||
}
|
||||
|
||||
/// isRegFormat - Indicates whether a particular form requires the Mod field of
|
||||
/// the ModR/M byte to be 0b11.
|
||||
///
|
||||
@ -869,169 +795,52 @@ void RecognizableInstr::emitDecodePath(DisassemblerTables &tables) const {
|
||||
|
||||
switch (OpMap) {
|
||||
default: llvm_unreachable("Invalid map!");
|
||||
// Extended two-byte opcodes can start with 66 0f, f2 0f, f3 0f, or 0f
|
||||
case X86Local::OB:
|
||||
case X86Local::TB:
|
||||
opcodeType = TWOBYTE;
|
||||
|
||||
switch (Opcode) {
|
||||
default:
|
||||
if (needsModRMForDecode(Form))
|
||||
filter = new ModFilter(isRegFormat(Form));
|
||||
else
|
||||
filter = new DumbFilter();
|
||||
break;
|
||||
#define EXTENSION_TABLE(n) case 0x##n:
|
||||
TWO_BYTE_EXTENSION_TABLES
|
||||
#undef EXTENSION_TABLE
|
||||
switch (Form) {
|
||||
default:
|
||||
llvm_unreachable("Unhandled two-byte extended opcode");
|
||||
case X86Local::MRM0r:
|
||||
case X86Local::MRM1r:
|
||||
case X86Local::MRM2r:
|
||||
case X86Local::MRM3r:
|
||||
case X86Local::MRM4r:
|
||||
case X86Local::MRM5r:
|
||||
case X86Local::MRM6r:
|
||||
case X86Local::MRM7r:
|
||||
filter = new ExtendedFilter(true, Form - X86Local::MRM0r);
|
||||
break;
|
||||
case X86Local::MRM0m:
|
||||
case X86Local::MRM1m:
|
||||
case X86Local::MRM2m:
|
||||
case X86Local::MRM3m:
|
||||
case X86Local::MRM4m:
|
||||
case X86Local::MRM5m:
|
||||
case X86Local::MRM6m:
|
||||
case X86Local::MRM7m:
|
||||
filter = new ExtendedFilter(false, Form - X86Local::MRM0m);
|
||||
break;
|
||||
MRM_MAPPING
|
||||
} // switch (Form)
|
||||
break;
|
||||
} // switch (Opcode)
|
||||
opcodeToSet = Opcode;
|
||||
break;
|
||||
case X86Local::T8:
|
||||
opcodeType = THREEBYTE_38;
|
||||
switch (Opcode) {
|
||||
default:
|
||||
if (needsModRMForDecode(Form))
|
||||
filter = new ModFilter(isRegFormat(Form));
|
||||
else
|
||||
filter = new DumbFilter();
|
||||
break;
|
||||
#define EXTENSION_TABLE(n) case 0x##n:
|
||||
THREE_BYTE_38_EXTENSION_TABLES
|
||||
#undef EXTENSION_TABLE
|
||||
switch (Form) {
|
||||
default:
|
||||
llvm_unreachable("Unhandled two-byte extended opcode");
|
||||
case X86Local::MRM0r:
|
||||
case X86Local::MRM1r:
|
||||
case X86Local::MRM2r:
|
||||
case X86Local::MRM3r:
|
||||
case X86Local::MRM4r:
|
||||
case X86Local::MRM5r:
|
||||
case X86Local::MRM6r:
|
||||
case X86Local::MRM7r:
|
||||
filter = new ExtendedFilter(true, Form - X86Local::MRM0r);
|
||||
break;
|
||||
case X86Local::MRM0m:
|
||||
case X86Local::MRM1m:
|
||||
case X86Local::MRM2m:
|
||||
case X86Local::MRM3m:
|
||||
case X86Local::MRM4m:
|
||||
case X86Local::MRM5m:
|
||||
case X86Local::MRM6m:
|
||||
case X86Local::MRM7m:
|
||||
filter = new ExtendedFilter(false, Form - X86Local::MRM0m);
|
||||
break;
|
||||
MRM_MAPPING
|
||||
} // switch (Form)
|
||||
break;
|
||||
} // switch (Opcode)
|
||||
opcodeToSet = Opcode;
|
||||
break;
|
||||
case X86Local::TA:
|
||||
opcodeType = THREEBYTE_3A;
|
||||
if (needsModRMForDecode(Form))
|
||||
filter = new ModFilter(isRegFormat(Form));
|
||||
else
|
||||
filter = new DumbFilter();
|
||||
opcodeToSet = Opcode;
|
||||
break;
|
||||
case X86Local::A6:
|
||||
opcodeType = THREEBYTE_A6;
|
||||
if (needsModRMForDecode(Form))
|
||||
filter = new ModFilter(isRegFormat(Form));
|
||||
else
|
||||
filter = new DumbFilter();
|
||||
opcodeToSet = Opcode;
|
||||
break;
|
||||
case X86Local::A7:
|
||||
opcodeType = THREEBYTE_A7;
|
||||
if (needsModRMForDecode(Form))
|
||||
filter = new ModFilter(isRegFormat(Form));
|
||||
else
|
||||
filter = new DumbFilter();
|
||||
opcodeToSet = Opcode;
|
||||
break;
|
||||
case X86Local::XOP8:
|
||||
opcodeType = XOP8_MAP;
|
||||
if (needsModRMForDecode(Form))
|
||||
filter = new ModFilter(isRegFormat(Form));
|
||||
else
|
||||
filter = new DumbFilter();
|
||||
opcodeToSet = Opcode;
|
||||
break;
|
||||
case X86Local::XOP9:
|
||||
opcodeType = XOP9_MAP;
|
||||
switch (Opcode) {
|
||||
default:
|
||||
if (needsModRMForDecode(Form))
|
||||
filter = new ModFilter(isRegFormat(Form));
|
||||
else
|
||||
filter = new DumbFilter();
|
||||
break;
|
||||
#define EXTENSION_TABLE(n) case 0x##n:
|
||||
XOP9_MAP_EXTENSION_TABLES
|
||||
#undef EXTENSION_TABLE
|
||||
switch (Form) {
|
||||
default:
|
||||
llvm_unreachable("Unhandled XOP9 extended opcode");
|
||||
case X86Local::MRM0r:
|
||||
case X86Local::MRM1r:
|
||||
case X86Local::MRM2r:
|
||||
case X86Local::MRM3r:
|
||||
case X86Local::MRM4r:
|
||||
case X86Local::MRM5r:
|
||||
case X86Local::MRM6r:
|
||||
case X86Local::MRM7r:
|
||||
filter = new ExtendedFilter(true, Form - X86Local::MRM0r);
|
||||
break;
|
||||
case X86Local::MRM0m:
|
||||
case X86Local::MRM1m:
|
||||
case X86Local::MRM2m:
|
||||
case X86Local::MRM3m:
|
||||
case X86Local::MRM4m:
|
||||
case X86Local::MRM5m:
|
||||
case X86Local::MRM6m:
|
||||
case X86Local::MRM7m:
|
||||
filter = new ExtendedFilter(false, Form - X86Local::MRM0m);
|
||||
break;
|
||||
MRM_MAPPING
|
||||
} // switch (Form)
|
||||
break;
|
||||
} // switch (Opcode)
|
||||
opcodeToSet = Opcode;
|
||||
break;
|
||||
case X86Local::XOPA:
|
||||
opcodeType = XOPA_MAP;
|
||||
if (needsModRMForDecode(Form))
|
||||
filter = new ModFilter(isRegFormat(Form));
|
||||
else
|
||||
switch (OpMap) {
|
||||
default: llvm_unreachable("Unexpected map!");
|
||||
case X86Local::OB: opcodeType = ONEBYTE; break;
|
||||
case X86Local::TB: opcodeType = TWOBYTE; break;
|
||||
case X86Local::T8: opcodeType = THREEBYTE_38; break;
|
||||
case X86Local::TA: opcodeType = THREEBYTE_3A; break;
|
||||
case X86Local::A6: opcodeType = THREEBYTE_A6; break;
|
||||
case X86Local::A7: opcodeType = THREEBYTE_A7; break;
|
||||
case X86Local::XOP8: opcodeType = XOP8_MAP; break;
|
||||
case X86Local::XOP9: opcodeType = XOP9_MAP; break;
|
||||
case X86Local::XOPA: opcodeType = XOPA_MAP; break;
|
||||
}
|
||||
|
||||
switch (Form) {
|
||||
default:
|
||||
filter = new DumbFilter();
|
||||
break;
|
||||
case X86Local::MRMDestReg: case X86Local::MRMDestMem:
|
||||
case X86Local::MRMSrcReg: case X86Local::MRMSrcMem:
|
||||
case X86Local::MRMXr: case X86Local::MRMXm:
|
||||
filter = new ModFilter(isRegFormat(Form));
|
||||
break;
|
||||
case X86Local::MRM0r: case X86Local::MRM1r:
|
||||
case X86Local::MRM2r: case X86Local::MRM3r:
|
||||
case X86Local::MRM4r: case X86Local::MRM5r:
|
||||
case X86Local::MRM6r: case X86Local::MRM7r:
|
||||
filter = new ExtendedFilter(true, Form - X86Local::MRM0r);
|
||||
break;
|
||||
case X86Local::MRM0m: case X86Local::MRM1m:
|
||||
case X86Local::MRM2m: case X86Local::MRM3m:
|
||||
case X86Local::MRM4m: case X86Local::MRM5m:
|
||||
case X86Local::MRM6m: case X86Local::MRM7m:
|
||||
filter = new ExtendedFilter(false, Form - X86Local::MRM0m);
|
||||
break;
|
||||
MRM_MAPPING
|
||||
} // switch (Form)
|
||||
|
||||
opcodeToSet = Opcode;
|
||||
break;
|
||||
case X86Local::D8:
|
||||
@ -1048,80 +857,6 @@ void RecognizableInstr::emitDecodePath(DisassemblerTables &tables) const {
|
||||
filter = new ExactFilter(Opcode);
|
||||
opcodeToSet = 0xd8 + (OpMap - X86Local::D8);
|
||||
break;
|
||||
case X86Local::OB:
|
||||
opcodeType = ONEBYTE;
|
||||
switch (Opcode) {
|
||||
#define EXTENSION_TABLE(n) case 0x##n:
|
||||
ONE_BYTE_EXTENSION_TABLES
|
||||
#undef EXTENSION_TABLE
|
||||
switch (Form) {
|
||||
default:
|
||||
llvm_unreachable("Fell through the cracks of a single-byte "
|
||||
"extended opcode");
|
||||
case X86Local::MRM0r:
|
||||
case X86Local::MRM1r:
|
||||
case X86Local::MRM2r:
|
||||
case X86Local::MRM3r:
|
||||
case X86Local::MRM4r:
|
||||
case X86Local::MRM5r:
|
||||
case X86Local::MRM6r:
|
||||
case X86Local::MRM7r:
|
||||
filter = new ExtendedFilter(true, Form - X86Local::MRM0r);
|
||||
break;
|
||||
case X86Local::MRM0m:
|
||||
case X86Local::MRM1m:
|
||||
case X86Local::MRM2m:
|
||||
case X86Local::MRM3m:
|
||||
case X86Local::MRM4m:
|
||||
case X86Local::MRM5m:
|
||||
case X86Local::MRM6m:
|
||||
case X86Local::MRM7m:
|
||||
filter = new ExtendedFilter(false, Form - X86Local::MRM0m);
|
||||
break;
|
||||
MRM_MAPPING
|
||||
} // switch (Form)
|
||||
break;
|
||||
case 0xd8:
|
||||
case 0xd9:
|
||||
case 0xda:
|
||||
case 0xdb:
|
||||
case 0xdc:
|
||||
case 0xdd:
|
||||
case 0xde:
|
||||
case 0xdf:
|
||||
switch (Form) {
|
||||
default:
|
||||
llvm_unreachable("Unhandled escape opcode form");
|
||||
case X86Local::MRM0r:
|
||||
case X86Local::MRM1r:
|
||||
case X86Local::MRM2r:
|
||||
case X86Local::MRM3r:
|
||||
case X86Local::MRM4r:
|
||||
case X86Local::MRM5r:
|
||||
case X86Local::MRM6r:
|
||||
case X86Local::MRM7r:
|
||||
filter = new ExtendedFilter(true, Form - X86Local::MRM0r);
|
||||
break;
|
||||
case X86Local::MRM0m:
|
||||
case X86Local::MRM1m:
|
||||
case X86Local::MRM2m:
|
||||
case X86Local::MRM3m:
|
||||
case X86Local::MRM4m:
|
||||
case X86Local::MRM5m:
|
||||
case X86Local::MRM6m:
|
||||
case X86Local::MRM7m:
|
||||
filter = new ExtendedFilter(false, Form - X86Local::MRM0m);
|
||||
break;
|
||||
} // switch (Form)
|
||||
break;
|
||||
default:
|
||||
if (needsModRMForDecode(Form))
|
||||
filter = new ModFilter(isRegFormat(Form));
|
||||
else
|
||||
filter = new DumbFilter();
|
||||
break;
|
||||
} // switch (Opcode)
|
||||
opcodeToSet = Opcode;
|
||||
} // switch (OpMap)
|
||||
|
||||
assert(opcodeType != (OpcodeType)-1 &&
|
||||
|
||||
Loading…
Reference in New Issue
Block a user