1 /* src/vm/jit/m68k/asmpart.S - Java-C interface functions for m68k
3 Copyright (C) 2006, 2007 R. Grafl, A. Krall, C. Kruegel,
4 C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
5 E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
6 J. Wenninger, Institut f. Computersprachen - TU Wien
8 This file is part of CACAO.
10 This program is free software; you can redistribute it and/or
11 modify it under the terms of the GNU General Public License as
12 published by the Free Software Foundation; either version 2, or (at
13 your option) any later version.
15 This program is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
32 #include "vm/jit/methodheader.h"
37 .globl asm_vm_call_method
38 .globl asm_vm_call_method_int
39 .globl asm_vm_call_method_long
40 .globl asm_vm_call_method_float
41 .globl asm_vm_call_method_double
42 .globl asm_vm_call_method_end
43 .globl asm_vm_call_method_exception_handler
45 .globl asm_call_jit_compiler
47 .globl asm_patcher_wrapper
49 .globl asm_abstractmethoderror
51 .globl asm_handle_exception
52 .globl asm_handle_nat_exception
55 * This functions implement the C prototyped funtion
56 * java_objectheader *asm_vm_call_method(methodinfo *m, s4 vmargscount,vm_arg *vmargs);
57 * the _int, _long, _float, _double are used for different return types
59 * The function may still be uncompiled, so the jit compiler gets invoked.
64 /* this is the method header see src/vm/jit/methodheader.h */
66 .long 0 /* catch type all */
67 .long 0 /* handler pc */
69 .long 0 /* start pc */
70 .long 1 /* extable size */
71 .long 0 /* line number table start */
72 .long 0 /* line number table size */
77 .long 0 /* frame size */
78 .long 0 /* codeinfo pointer */
82 This method gets called with 3 arguments:
83 1st arg: addres of method to call (fake invokevirtual here)
84 2nd arg: uint64_t array of argument registers followed by stack
85 3rd arg: number of 8 byte stack slots to be copied.
87 coldifire does not use any argument registers, so just the stack has to be copied
90 asm_vm_call_method_int:
91 asm_vm_call_method_long:
92 asm_vm_call_method_float:
93 asm_vm_call_method_double:
95 #if defined(ENABLE_SOFTFLOAT)
96 addal #(-12*4),%sp /* create stackframe to save registers, and 1 slot for method invocation */
97 moveml %d2/%d3/%d4/%d5/%d6/%d7/%a2/%a3/%a4/%a5/%fp,%sp@ /* save registers */
99 /* fetch arguments from vmargs data structure */
100 movel %sp@(12*4+1*4),%a3 /* method */
101 movel %sp@(12*4+2*4),%a2 /* arg array */
102 movel %sp@(12*4+3*4),%d2 /* arg count */
104 movel %a3, %sp@(12*4) /* copy method address to stackslot */
105 leal %sp@(12*4), %a3 /* and store that address in %a3 */
107 addal #(-12*4-6*8), %sp
108 moveml %d2/%d3/%d4/%d5/%d6/%d7/%a2/%a3/%a4/%a5/%fp,%sp@ /* save registers */
109 fmovemd %fp2/%fp3/%fp4/%fp5/%fp6/%fp7,%sp@(11*4) /* save registers */
111 /* fetch arguments from vmargs data structure */
112 movel %sp@(12*4+6*8+1*4),%a3 /* method */
113 movel %sp@(12*4+6*8+2*4),%a2 /* arg array */
114 movel %sp@(12*4+6*8+3*4),%d2 /* arg count */
116 movel %a3, %sp@(11*4+6*8) /* copy method address to stackslot */
117 leal %sp@(11*4+6*8), %a3 /* and store that address in %a3 */
120 moveal %sp, %a5 /* memorize stack */
122 tstl %d2 /* do we have arguments ? */
123 beq L_asm_vm_call_method_copy_done
124 movel %d2, %d3 /* create stackframe */
125 asll #3, %d3 /* number args * 8 */
127 moveal %sp, %a4 /* %a4 is temp stack pointer */
129 L_asm_vm_call_method_copy_loop:
131 movel %d3, %a4@(0) /* copy 4 bytes */
133 movel %d3, %a4@(4) /* a whole stack slot has been copied */
138 tstl %d2 /* do we have more arguments ? */
139 beq L_asm_vm_call_method_copy_done
140 br L_asm_vm_call_method_copy_loop
143 L_asm_vm_call_method_copy_done:
144 /* now we fake method invocation as it would happen from invokevirtual */
145 /* this is needed as we patch the caller site, so we need a writeable slot */
146 /* %a3 points to the address containing the method, %a3 == REG_METHODPTR */
151 L_asm_vm_call_method_return:
152 movel %a5, %sp /* pop arguments off stack */
154 #if defined(ENABLE_SOFTFLOAT)
155 moveml %sp@, %d2/%d3/%d4/%d5/%d6/%d7/%a2/%a3/%a4/%a5/%fp /* restore registers */
156 addal #(12*4),%sp /* restore stack */
158 fmovemd %sp@(12*4), %fp2/%fp3/%fp4/%fp5/%fp6/%fp7 /* restore registers */
159 moveml %sp@, %d2/%d3/%d4/%d5/%d6/%d7/%a2/%a3/%a4/%a5/%fp /* restore registers */
160 addal #(12*4+6*8),%sp /* restore stack */
162 moveal %d0, %a0 /* XXX return value in %a0, too, gcc sometimes expects addresses in %a0, wired */
163 asm_vm_call_method_end: /* symbol needed to insert method into avl tree */
164 rts /* return to c code */
166 /* asm_vm_call_method_exception_handler ********************************************************************
168 * calls void *builtin_throw_exception(java_objectheader *xptr) when no other handler is appropiate
169 * this functions gets called indirectly from asm_handle_exception, which back then moved xptr to %a2
170 * clear software design is in the eye of the beholder.
171 ************************************************************************************************************/
172 asm_vm_call_method_exception_handler:
173 movel %a2, %sp@- /* push xptr argument */
174 jsr builtin_throw_exception
175 lea %sp@(4), %sp /* pop arg off stack */
176 jmp L_asm_vm_call_method_return
179 /* asm_call_jit_compiler ************************************************************************************
180 * Invokes compiler for untranslated java methods.
181 * C prototype: void asm_call_jit_compiler(void);
182 * BUT: this does not match reality, arguments _ARE_ passed via createcompilerstub and asm_vm_call_method...
183 * arguments passed via %a2(methodinfo) == REG_ATMP1
184 * %a3(mptr) == REG_ATMP2
185 ************************************************************************************************************/
186 asm_call_jit_compiler:
187 addal #(-4*4),%sp /* create stackframe to save registers */
188 moveml %a0/%a1/%d0/%d1,%sp@ /* save volatile registers */
189 #if !defined(ENABLE_SOFTFLOAT)
191 fmovemd %fp0/%fp1, %sp@
192 movel %sp@(8*4), %sp@-
195 movel %sp@(4*4), %sp@- /* push arguments onto stack (ra)*/
196 pea %sp@(4*4+8) /* the old stack pointer*/
198 movel %a3,%sp@- /* mptr */
199 movel %a2,%sp@- /* methodinfo */
201 /* C prototype: u1 *jit_asm_compile(methodinfo *m, u1 *mptr, u1 *sp, u1 *ra); */
202 jsr jit_asm_compile /* invoke compiler */
203 addal #(4*4),%sp /* pop arguments off stack */
204 moveal %d0, %a2 /* to tmp register */
206 #if !defined(ENABLE_SOFTFLOAT)
207 fmovemd %sp@, %fp0/%fp1
211 moveml %sp@,%a0/%a1/%d0/%d1 /* restore volatile registers */
212 addal #(4*4),%sp /* remove stackframe */
214 tstl %a2 /* check for exception */
215 beq L_asm_call_jit_compiler_exception
217 jmp %a2@ /* invoke java method */
218 jsr 0 /* we should not ever return here */
220 L_asm_call_jit_compiler_exception:
221 jsr exceptions_get_and_clear_exception /* exception object in %d0 now */
222 moveal %d0, %a2 /* move exception object into sptr register */
223 moveal %sp@+, %a3 /* pop return address into exception address reg */
224 jmp asm_handle_exception /* handle exception */
227 /* asm_patcher_wrapper ********************************************************
229 prepares arguments on stack
230 calls patcher_wrapper signature: java_objectheader *patcher_wrapper(u1 *sp, u1 *pv, u1 *ra);
235 16 pointer to virtual java_objectheader
236 12 last byte of machine code (xmcode)
237 8 machine code (which is patched back later)
238 4 unresolved field reference
239 0 patcher function pointer to call
240 *******************************************************************************/
243 /* save scratch registers */
249 #if defined(ENABLE_SOFTFLOAT)
250 /* calculate original value of sp */
255 fmovemd %fp0/%fp1, %sp@
261 clrl %sp@- /* pass ra */
262 clrl %sp@- /* pass pv, if null use findmethod */
263 movel %d0, %sp@- /* pass sp of patcher stub */
264 jsr patcher_wrapper /* return value in %d0 */
266 lea %sp@(3*4), %sp /* pop arguments off stack */
267 tst %d0 /* test if exception occured */
268 bne L_asm_patcher_wrapper_exception
270 #if !defined(ENABLE_SOFTFLOAT)
271 fmovemd %sp@, %fp0/%fp1
279 lea %sp@(6*4), %sp /* restore stack and remove patcher stub*/
280 rts /* back to jit code */
282 L_asm_patcher_wrapper_exception:
283 /* WARNING: the stack is still disturbed, look at asm_patcher_wrapper for details */
284 /* we do not need to restore the content of the registers, I hope */
285 #if !defined(ENABLE_SOFTFLOAT)
291 lea %sp@(5*4), %sp /* restore stack and remove patcher stub*/
292 movel %sp@+, %d4 /* restore REG_ITMP3, stored in emit_patcher_stubs */
293 moveal %d0, %a2 /* xptr, pointer to exception object */
294 moveal %sp@+, %a3 /* pop return address into exception address register */
295 jmp asm_handle_exception /* handle exception */
296 illegal /* XXX: we never come back */
299 asm_abstractmethoderror:
301 /* asm_handle_exception ********************************************************
303 * This function handles an exception. It does not use the usual calling *
304 * conventions. The exception pointer is passed in REG_ATMP1 and the *
305 * pc from the exception raising position is passed in REG_ATMP2. It searches *
306 * the local exception table for a handler. If no one is found, it unwinds *
307 * stacks and continues searching the callers. *
309 * void asm_handle_exception (void);
310 * exception object pointer...%a2 exception raising address...%a3 *
312 *******************************************************************************/
313 asm_handle_nat_exception:
315 asm_handle_exception:
316 L_asm_handle_exception_stack_loop:
317 /* save temporary registers */
322 #if !defined(ENABLE_SOFTFLOAT)
324 fmovemd %fp0, %sp@(0)
325 fmovemd %fp1, %sp@(8)
328 /* we need the dseg, figure it out */
329 movel %a3, %sp@- /* push ra argument */
330 jsr md_codegen_get_pv_from_pc /* pv in %d0 now */
331 movel %d0, %d2 /* move to safe register */
332 lea %sp@(4), %sp /* pop args off stack */
334 /* now call the following c function */
335 /* u1 *exceptions_handle_exception(java_objectheader *xptr, u1 *xpc, u1 *pv, u1 *sp) */
336 #if !defined(ENABLE_SOFTFLOAT)
344 jsr exceptions_handle_exception /* %d0 is address of handler or 0 when not catched */
345 lea %sp@(4*4), %sp /* pop args off stack */
347 beq L_asm_handle_exception_not_catched
349 /* %d0 contains address of exception handler */
352 /* restore temporary registers */
357 #if !defined(ENABLE_SOFTFLOAT)
358 fmovemd %fp0, %sp@(0)
359 fmovemd %fp1, %sp@(8)
365 L_asm_handle_exception_not_catched:
366 /* we did not find an exception handler in this stackframe */
367 /* remove this frame and search in the one above */
368 /* %a2 containts exception object ptr, %d2 the actual pv */
370 /* remove temporary registers stored */
371 #if !defined(ENABLE_SOFTFLOAT)
372 addal #4*4 + 8*2, %sp
378 movel %a3@(FrameSize), %d2
381 addal %d2, %a0 /* %a0 now points to top of stackframe, where saved regs are */
383 /* the saved registers have to be restored */
384 /* XXX ugly hack: intsave and adrsave share one field */
385 movel %a3@(IntSave), %d0
386 andil #0x0000ffff, %d0 /* this is IntSave */
388 beq L_asm_handle_ex_int_done
392 beq L_asm_handle_ex_int_done
396 beq L_asm_handle_ex_int_done
399 L_asm_handle_ex_int_done:
401 movel %a3@(IntSave), %d0
402 andil #0xffff0000, %d0 /* this is AdrSave */
408 beq L_asm_handle_ex_adr_done
412 beq L_asm_handle_ex_adr_done
416 beq L_asm_handle_ex_adr_done
420 L_asm_handle_ex_adr_done:
422 #if !defined(ENABLE_SOFTFLOAT)
423 movel %a3@(FltSave), %d0
425 beq L_asm_handle_ex_flt_done
426 fmovemd %a0@(-8), %fp7
429 beq L_asm_handle_ex_flt_done
430 fdmoved %a0@(-16), %fp6
433 beq L_asm_handle_ex_flt_done
434 fdmoved %a0@(-24), %fp5
436 L_asm_handle_ex_flt_done:
440 addal %d2, %sp /* remove old stackframe */
441 moveal %sp@+, %a3 /* make return address, new exception rasing address */
442 subal #2, %a3 /* it was a jsr %aX, which is 4 bytes long */
443 jmp L_asm_handle_exception_stack_loop
451 * These are local overrides for various environment variables in Emacs.
452 * Please do not remove this and leave it at the end of the file, where
453 * Emacs will automagically detect them.
454 * ---------------------------------------------------------------------
457 * indent-tabs-mode: t
461 * vim:noexpandtab:sw=4:ts=4: