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add LDR decoding

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Walter Bright 2024-06-28 22:35:37 -07:00 • committed by The Dlang Bot
parent be5dd7c25e
commit 0441fe3b15
1 changed files with 20 additions and 2 deletions
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22
compiler/src/dmd/backend/arm/disasmarm.d
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@ -338,7 +338,7 @@ void disassemble(uint c) @trusted
: ((immhi << 2) | immlo);
p3 = wordtostring(imm);
}
else if (field(ins, 28, 23) == 0x22) // https://www.scs.stanford.edu/~zyedidia/arm64/encodingindex.html#addsub_ext
else if (field(ins, 28, 23) == 0x22) // https://www.scs.stanford.edu/~zyedidia/arm64/encodingindex.html#addsub_imm
{
if (log) printf("Add/subtract (immediate)\n");
uint sf = field(ins, 31, 31);
@ -1637,7 +1637,23 @@ void disassemble(uint c) @trusted
}
}
else
if (field(ins, 31, 31) == 1 && field(ins, 29, 22) == 0xE5) // LDR (immediate) Unsigned offset
{ // https://www.scs.stanford.edu/~zyedidia/arm64/ldr_imm_gen.html
uint imm12 = field(ins, 21, 10);
uint Rn = field(ins, 9, 5);
uint Rt = field(ins, 4, 0);
uint is64 = field(ins, 30, 30);
p1 = "ldr";
p2 = regString(is64, Rt);
size_t n;
if (imm12)
n = snprintf(buf.ptr, cast(uint)buf.length, "[%s,%s]", regString(1, Rn).ptr, wordtostring(imm12 * (is64 ? 8 : 4)).ptr);
else
n = snprintf(buf.ptr, cast(uint)buf.length, "[%s]", regString(1, Rn).ptr);
p3 = buf[0 .. n];
}
else
// https://www.scs.stanford.edu/~zyedidia/arm64/encodingindex.html#ldst Loads and Stores
if (field(ins, 29, 27) == 7 && field(ins, 25, 24) == 1)
{
@ -1954,8 +1970,10 @@ unittest
unittest
{
int line64 = __LINE__;
string[41] cases64 = // 64 bit code gen
string[42] cases64 = // 64 bit code gen
[
"B9 40 0B E0 ldr w0,[sp,#8]",
"39 C0 00 20 ldrsb w0,[x1]",
"39 40 00 20 ldrb w0,[x1]",
"79 C0 00 20 ldrsh w0,[x1]",