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author | Filippos Karapetis | 2011-12-27 03:10:53 +0200 |
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committer | Filippos Karapetis | 2011-12-27 03:11:22 +0200 |
commit | 107805c34309401ac1367b8739a358dd2aaabf55 (patch) | |
tree | bd55169a1e2cbe4fe07fa9c62ff8d79a0cf78048 /engines | |
parent | a95f34bc64ada8f1d35466a0e4cb10c96ba95580 (diff) | |
download | scummvm-rg350-107805c34309401ac1367b8739a358dd2aaabf55.tar.gz scummvm-rg350-107805c34309401ac1367b8739a358dd2aaabf55.tar.bz2 scummvm-rg350-107805c34309401ac1367b8739a358dd2aaabf55.zip |
DREAMWEB: Remove almost all of the ASM runtime
Diffstat (limited to 'engines')
-rw-r--r-- | engines/dreamweb/runtime.h | 374 |
1 files changed, 1 insertions, 373 deletions
diff --git a/engines/dreamweb/runtime.h b/engines/dreamweb/runtime.h index 9b70d164a6..0bbef5028e 100644 --- a/engines/dreamweb/runtime.h +++ b/engines/dreamweb/runtime.h @@ -32,387 +32,15 @@ namespace DreamGen { -struct Register { - union { - uint16 _value; - uint8 _part[2]; - }; - inline Register(): _value() {} - inline Register& operator=(uint16 v) { _value = v; return *this; } - inline operator uint16&() { return _value; } -}; - -template<int kIndex> //from low to high -struct RegisterPart { - uint8 &_value; - - explicit inline RegisterPart(Register ®) : _value(reg._part[kIndex]) {} - - inline operator uint8&() { - return _value; - } - - inline RegisterPart& operator=(const RegisterPart& o) { - _value = o._value; - return *this; - } - - inline RegisterPart& operator=(uint8 v) { - _value = v; - return *this; - } -}; - -#ifdef SCUMM_LITTLE_ENDIAN - typedef RegisterPart<0> LowPartOfRegister; - typedef RegisterPart<1> HighPartOfRegister; -#else - typedef RegisterPart<1> LowPartOfRegister; - typedef RegisterPart<0> HighPartOfRegister; -#endif - -struct Flags { - bool _z, _c, _s, _o; - inline Flags(): _z(true), _c(false), _s(false), _o(false) {} - - inline bool z() const { return _z; } - inline bool c() const { return _c; } - inline bool s() const { return _s; } - - inline bool l() const { return _o != _s; } - inline bool le() const { return _o != _s|| _z; } - - inline void update_zs(uint8 v) { - _s = v & 0x80; - _z = v == 0; - } - - inline void update_zs(uint16 v) { - _s = v & 0x8000; - _z = v == 0; - } - - inline void update_o(uint8 v, uint8 a, uint8 b) { - uint8 s1 = a & 0x80, s2 = b & 0x80; - _o = (s1 == s2) && (v & 0x80) != s1; - } - - inline void update_o(uint16 v, uint16 a, uint16 b) { - uint16 s1 = a & 0x8000, s2 = b & 0x8000; - _o = (s1 == s2) && (v & 0x8000) != s1; - } -}; - class Context { public: - Register ax, dx, bx, cx, si, di; - LowPartOfRegister al; - HighPartOfRegister ah; - LowPartOfRegister bl; - HighPartOfRegister bh; - LowPartOfRegister cl; - HighPartOfRegister ch; - LowPartOfRegister dl; - HighPartOfRegister dh; - - SegmentRef cs; MutableSegmentRef ds; - MutableSegmentRef es; - Flags flags; - - Context(SegmentManager *segMan): al(ax), ah(ax), bl(bx), bh(bx), cl(cx), ch(cx), dl(dx), dh(dx), - cs(segMan->data), - ds(segMan, segMan->data), - es(segMan, segMan->data) { - - } - - inline void _cmp(uint8 a, uint8 b) { - _sub(a, b); - } - - inline void _cmp(uint16 a, uint16 b) { - _sub(a, b); - } - - inline void _test(uint8 a, uint8 b) { - _and(a, b); - } - - inline void _test(uint16 a, uint16 b) { - _and(a, b); - } - - inline void _add(uint8 &dst, uint8 src) { - unsigned r = (unsigned)dst + src; - flags.update_o((uint8)r, dst, src); - flags._c = r >= 0x100; - dst = r; - flags.update_zs(dst); - } - - inline void _add(uint16 &dst, uint16 src) { - unsigned r = (unsigned)dst + src; - flags.update_o((uint16)r, dst, src); - flags._c = r >= 0x10000; - dst = r; - flags.update_zs(dst); - } - - inline void _sub(uint8 &dst, uint8 src) { - flags.update_o(uint8(dst - src), dst, (uint8)-src); - flags._c = dst < src; - dst -= src; - flags.update_zs(dst); - } - - inline void _sub(uint16 &dst, uint16 src) { - flags.update_o(uint16(dst - src), dst, (uint16)-src); - flags._c = dst < src; - dst -= src; - flags.update_zs(dst); - } - - inline void _inc(uint8 &dst) { - flags.update_o((uint8)(dst + 1), dst, 1); - ++dst; - flags.update_zs(dst); - } - - inline void _inc(uint16 &dst) { - flags.update_o((uint16)(dst + 1), dst, 1); - ++dst; - flags.update_zs(dst); - } - inline void _dec(uint8 &dst) { - flags.update_o(uint8(dst - 1), dst, 1); - --dst; - flags.update_zs(dst); - } - - inline void _dec(uint16 &dst) { - flags.update_o(uint16(dst - 1), dst, 1); - --dst; - flags.update_zs(dst); - } - - inline void _and(uint8 &dst, uint8 src) { - dst &= src; - flags.update_zs(dst); - flags._c = flags._o = false; - } - - inline void _and(uint16 &dst, uint16 src) { - dst &= src; - flags.update_zs(dst); - flags._c = flags._o = false; - } + Context(SegmentManager *segMan): ds(segMan, segMan->data) { - inline void _or(uint8 &dst, uint8 src) { - dst |= src; - flags.update_zs(dst); - flags._c = flags._o = false; - } - - inline void _or(uint16 &dst, uint16 src) { - dst |= src; - flags.update_zs(dst); - flags._c = flags._o = false; - } - - inline void _xor(uint8 &dst, uint8 src) { - dst ^= src; - flags.update_zs(dst); - flags._c = flags._o = false; - } - - inline void _xor(uint16 &dst, uint16 src) { - dst ^= src; - flags.update_zs(dst); - flags._c = flags._o = false; - } - - inline void _shr(uint8 &dst, uint8 src) { - src &= 0x1f; - if (src > 0) { - dst >>= (src - 1); - flags._c = dst & 1; - dst >>= 1; - flags.update_zs(dst); - } - if (src == 1) - flags._o = dst & 0x80; - } - - inline void _shr(uint16 &dst, uint8 src) { - src &= 0x1f; - if (src > 0) { - dst >>= (src - 1); - flags._c = dst & 1; - dst >>= 1; - flags.update_zs(dst); - } - if (src == 1) - flags._o = dst & 0x8000; - } - - inline void _shl(uint8 &dst, uint8 src) { - src &= 0x1f; - if (src > 0) { - dst <<= (src - 1); - flags._c = dst & 0x80; - dst <<= 1; - flags.update_zs(dst); - } - if (src == 1) - flags._o = ((dst & 0x80) != 0) == flags._c; - } - inline void _shl(uint16 &dst, uint8 src) { - src &= 0x1f; - if (src > 0) { - dst <<= (src - 1); - flags._c = dst & 0x8000; - dst <<= 1; - flags.update_zs(dst); - } - if (src == 1) - flags._o = ((dst & 0x8000) != 0) == flags._c; - } - - inline void _mul(uint8 src) { - unsigned r = unsigned(al) * src; - ax = (uint16)r; - flags._c = r >= 0x10000; - flags._z = r == 0; - flags._s = r & 0x8000; - flags._o = ah != 0; - } - - inline void _mul(uint16 src) { - unsigned r = unsigned(ax) * src; //assuming here that we have at least 32 bits - dx = (r >> 16) & 0xffff; - ax = r & 0xffff; - flags._c = false; - flags._z = r == 0; - flags._s = r & 0x80000000; - flags._o = dx != 0; - } - - inline void _neg(uint8 &src) { - uint8 r = 0; - _sub(r, src); - src = r; - } - - inline void _neg(uint16 &src) { - uint16 r = 0; - _sub(r, src); - src = r; - } - - inline void _lodsb() { - al = ds.byte(si++); - } - - inline void _lodsw() { - ax = ds.word(si); - si += 2; - } - - inline void _movsb() { - es.byte(di++) = ds.byte(si++); - } - - inline void _movsb(uint size, bool clear_cx = false) { - assert(size != 0xffff); - //fixme: add overlap and segment boundary check and rewrite - while (size--) - _movsb(); - if (clear_cx) - cx = 0; - } - - inline void _movsw() { - _movsb(); - _movsb(); - } - - inline void _movsw(uint size, bool clear_cx = false) { - assert(size != 0xffff); - _movsb(size * 2, clear_cx); - } - - inline void _stosb() { - es.byte(di++) = al; - } - - inline void _stosb(uint size, bool clear_cx = false) { - assert(size != 0xffff); - uint8 *dst = es.ptr(di, size); - memset(dst, al, size); - di += size; - if (clear_cx) - cx = 0; - } - - inline void _stosw() { - es.byte(di++) = al; - es.byte(di++) = ah; - } - - inline void _stosw(uint size, bool clear_cx = false) { - assert(size != 0xffff); - uint8 *dst = es.ptr(di, size * 2); - di += 2 * size; - while (size--) { - *dst++ = al; - *dst++ = ah; - } - if (clear_cx) - cx = 0; - } - - inline void _xchg(uint16 &a, uint16 &b) { - uint16 x = a; - a = b; - b = x; - } - - inline void _xchg(uint8 &a, uint8 &b) { - uint8 t = a; - a = b; - b = t; - } - - Common::Array<uint16> stack; - inline void push(uint16 v) { - stack.push_back(v); - } - - inline uint16 pop() { - assert(!stack.empty()); - uint16 v = stack.back(); - stack.pop_back(); - return v; } }; -class StackChecker { - const Context &_context; - const uint _stackDepth; - -public: - StackChecker(const Context &context): _context(context), _stackDepth(context.stack.size()) {} - ~StackChecker() { assert(_context.stack.size() == _stackDepth); } -}; - -#ifndef NDEBUG -# define STACK_CHECK StackChecker checker(*this) -#else -# define STACK_CHECK do {} while (0) -#endif - } // End of namespace DreamGen #endif |