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root/cebix/SheepShaver/src/kpx_cpu/sheepshaver_glue.cpp

Comparing SheepShaver/src/kpx_cpu/sheepshaver_glue.cpp (file contents):
Revision 1.65 by gbeauche, 2005-07-03T22:02:01Z vs.
Revision 1.66 by gbeauche, 2005-12-06T22:25:13Z

#	Line 177 | Line 177 | public:
177
178		// Make sure the SIGSEGV handler can access CPU registers
179		friend sigsegv_return_t sigsegv_handler(sigsegv_address_t, sigsegv_address_t);
180	–
181	–	// Memory allocator returning areas aligned on 16-byte boundaries
182	–	void *operator new(size_t size);
183	–	void operator delete(void *p);
180		};
181
186	–	// Memory allocator returning sheepshaver_cpu objects aligned on 16-byte boundaries
187	–	// FORMAT: [ alignment ] magic identifier, offset to malloc'ed data, sheepshaver_cpu data
188	–	void *sheepshaver_cpu::operator new(size_t size)
189	–	{
190	–	const int ALIGN = 16;
191	–
192	–	// Allocate enough space for sheepshaver_cpu data + signature + align pad
193	–	uint8 *ptr = (uint8 *)malloc(size + ALIGN * 2);
194	–	if (ptr == NULL)
195	–	throw std::bad_alloc();
196	–
197	–	// Align memory
198	–	int ofs = 0;
199	–	while ((((uintptr)ptr) % ALIGN) != 0)
200	–	ofs++, ptr++;
201	–
202	–	// Insert signature and offset
203	–	struct aligned_block_t {
204	–	uint32 pad[(ALIGN - 8) / 4];
205	–	uint32 signature;
206	–	uint32 offset;
207	–	uint8  data[sizeof(sheepshaver_cpu)];
208	–	};
209	–	aligned_block_t *blk = (aligned_block_t *)ptr;
210	–	blk->signature = FOURCC('S','C','P','U');
211	–	blk->offset = ofs + (&blk->data[0] - (uint8 *)blk);
212	–	assert((((uintptr)&blk->data) % ALIGN) == 0);
213	–	return &blk->data[0];
214	–	}
215	–
216	–	void sheepshaver_cpu::operator delete(void *p)
217	–	{
218	–	uint32 *blk = (uint32 *)p;
219	–	assert(blk[-2] == FOURCC('S','C','P','U'));
220	–	void *ptr = (void *)(((uintptr)p) - blk[-1]);
221	–	free(ptr);
222	–	}
223	–
182		sheepshaver_cpu::sheepshaver_cpu()
183		: powerpc_cpu(enable_jit_p())
184		{

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