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powerpc: Use util::sext for sign extension in disassembler

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This commit is contained in:
AJR 2023-11-09 10:12:30 -05:00
parent 72c3d0a89c
commit f6b94463e4
1 changed files with 4 additions and 8 deletions
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12
src/devices/cpu/powerpc/ppc_dasm.cpp
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@ -559,8 +559,8 @@ std::string powerpc_disassembler::DecodeSigned16(uint32_t op, int do_unsigned)
int16_t s;
s = G_SIMM(op);
if (do_unsigned) // sign extend to unsigned 32-bits
return util::string_format("0x%04X", (uint32_t) s);
if (do_unsigned)
return util::string_format("0x%04X", (uint16_t) s);
else // print as signed 16 bits
{
if (s < 0)
@ -868,16 +868,12 @@ offs_t powerpc_disassembler::dasm_one(std::ostream &stream, uint32_t pc, uint32_
break;
case F_LI:
disp = G_LI(op) * 4;
if (disp & 0x02000000) // sign extend
disp |= 0xfc000000;
disp = util::sext(G_LI(op) * 4, 26);
oprs = util::string_format("0x%08X", disp + ((op & M_AA) ? 0 : pc));
break;
case F_BCx:
disp = G_BD(op) * 4;
if (disp & 0x00008000)
disp |= 0xffff0000;
disp = util::sext(G_BD(op) * 4, 16);
if (G_BO(op) & 0x10) // BI is ignored (don't print CR bit)
oprs = util::string_format("0x%02X,%d,0x%08X", G_BO(op), G_BI(op), disp + ((op & M_AA) ? 0 : pc));