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ARM: Decode plain binary immediate thumb data processing instructions.

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This commit is contained in:
Gabe Black 2010-06-02 12:58:03 -05:00
parent dcf218155d
commit c7d2f43641
2 changed files with 69 additions and 1 deletions
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2
src/arch/arm/isa/decoder/thumb.isa
View file

@ -159,7 +159,7 @@
0x2: decode LTOPCODE_15 {
0x0: decode HTOPCODE_9 {
0x0: Thumb32DataProcModImm::thumb32DataProcModImm();
0x1: WarnUnimpl::Data_processing_plain_binary_immediate();
0x1: Thumb32DataProcPlainBin::thumb32DataProcPlainBin();
}
0x1: Thumb32BranchesAndMiscCtrl::thumb32BranchesAndMiscCtrl();
}

68
src/arch/arm/isa/formats/data.isa
View file

@ -479,6 +479,74 @@ def format Thumb32DataProcModImm() {{
}
}};
def format Thumb32DataProcPlainBin() {{
decode_block = '''
{
const uint32_t op = bits(machInst, 24, 20);
const IntRegIndex rn = (IntRegIndex)(uint32_t)bits(machInst, 19, 16);
const IntRegIndex rd = (IntRegIndex)(uint32_t)bits(machInst, 11, 8);
switch (op) {
case 0x0:
{
const uint32_t imm = bits(machInst, 7, 0) |
(bits(machInst, 14, 12) << 8) |
(bits(machInst, 26) << 11);
return new AddImm(machInst, rd, rn, imm, true);
}
case 0x4:
{
const uint32_t imm = bits(machInst, 7, 0) |
(bits(machInst, 14, 12) << 8) |
(bits(machInst, 26) << 11) |
(bits(machInst, 19, 16) << 12);
return new MovImm(machInst, rd, INTREG_ZERO, imm, true);
}
case 0xa:
{
const uint32_t imm = bits(machInst, 7, 0) |
(bits(machInst, 14, 12) << 8) |
(bits(machInst, 26) << 11);
return new SubImm(machInst, rd, rn, imm, true);
}
case 0xc:
{
const uint32_t imm = bits(machInst, 7, 0) |
(bits(machInst, 14, 12) << 8) |
(bits(machInst, 26) << 11) |
(bits(machInst, 19, 16) << 12);
return new MovtImm(machInst, rd, rd, imm, true);
}
case 0x12:
if (!(bits(machInst, 14, 12) || bits(machInst, 7, 6))) {
return new WarnUnimplemented("ssat16", machInst);
}
// Fall through on purpose...
case 0x10:
return new WarnUnimplemented("ssat", machInst);
case 0x14:
return new WarnUnimplemented("sbfx", machInst);
case 0x16:
if (rn == 0xf) {
return new WarnUnimplemented("bfc", machInst);
} else {
return new WarnUnimplemented("bfi", machInst);
}
case 0x1a:
if (!(bits(machInst, 14, 12) || bits(machInst, 7, 6))) {
return new WarnUnimplemented("usat16", machInst);
}
// Fall through on purpose...
case 0x18:
return new WarnUnimplemented("usat", machInst);
case 0x1c:
return new WarnUnimplemented("ubfx", machInst);
default:
return new Unknown(machInst);
}
}
'''
}};
def format Thumb32DataProcShiftReg() {{
def decInst(mnem, dest="rd", op1="rn"):