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Support for floating-point loads and stores

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This commit is contained in:
dingusdev 2020-02-02 12:54:44 -07:00
parent 254b9d3b55
commit 96e9351190
1 changed files with 30 additions and 2 deletions
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32
cpu/ppc/ppcdisasm.cpp
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@ -78,6 +78,9 @@ const char* opc_int_ldst[16] = { /* integer load and store instructions */
"lha", "lhau", "sth", "sthu", "lmw", "stmw"
};
const char* opc_flt_ldst[8] = { /* integer load and store instructions */
"lfs", "lfsu", "lfd", "lfdu", "stfs", "stfsu", "sftd", "sftdu"
};
/** various formatting helpers. */
void fmt_oneop(string& buf, const char* opc, int src)
@ -726,6 +729,31 @@ void opc_intldst(PPCDisasmContext* ctx)
}
}
void opc_fltldst(PPCDisasmContext* ctx)
{
int32_t opcode = (ctx->instr_code >> 26) - 48;
int32_t ra = (ctx->instr_code >> 16) & 0x1F;
int32_t rd = (ctx->instr_code >> 21) & 0x1F;
int32_t imm = SIGNEXT(ctx->instr_code & 0xFFFF, 15);
/* ra = 0 is forbidden for loads and stores with update */
/* ra = rd is forbidden for loads with update */
if ((((opcode == 1) || (opcode == 3)) && ra == rd) || ((opcode & 1) && !ra))
{
opc_illegal(ctx);
return;
}
if (ra) {
ctx->instr_str = my_sprintf("%-8sfr%d, %s0x%X(r%d)", opc_flt_ldst[opcode],
rd, ((imm < 0) ? "-" : ""), abs(imm), ra);
}
else {
ctx->instr_str = my_sprintf("%-8sfr%d, %s0x%X", opc_flt_ldst[opcode],
rd, ((imm < 0) ? "-" : ""), abs(imm));
}
}
/** main dispatch table. */
static std::function<void(PPCDisasmContext*)> OpcodeDispatchTable[64] = {
opc_illegal, opc_illegal, opc_illegal, opc_twi,
@ -740,8 +768,8 @@ static std::function<void(PPCDisasmContext*)> OpcodeDispatchTable[64] = {
opc_intldst, opc_intldst, opc_intldst, opc_intldst,
opc_intldst, opc_intldst, opc_intldst, opc_intldst,
opc_intldst, opc_intldst, opc_intldst, opc_intldst,
opc_illegal, opc_illegal, opc_illegal, opc_illegal,
opc_illegal, opc_illegal, opc_illegal, opc_illegal,
opc_fltldst, opc_fltldst, opc_fltldst, opc_fltldst,
opc_fltldst, opc_fltldst, opc_fltldst, opc_fltldst,
opc_illegal, opc_illegal, opc_illegal, opc_illegal,
opc_illegal, opc_illegal, opc_illegal, opc_illegal