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 */
68 .long 0 /* line number table start */
69 .long 0 /* line number table size */
73 .long 0 /* frame size */
74 .long 0 /* codeinfo pointer */
78 This method gets called with 3 arguments:
79 1st arg: addres of method to call (fake invokevirtual here)
80 2nd arg: uint64_t array of argument registers followed by stack
81 3rd arg: number of 8 byte stack slots to be copied.
83 coldifire does not use any argument registers, so just the stack has to be copied
86 asm_vm_call_method_int:
87 asm_vm_call_method_long:
88 asm_vm_call_method_float:
89 asm_vm_call_method_double:
91 #if defined(ENABLE_SOFTFLOAT)
92 addal #(-12*4),%sp /* create stackframe to save registers, and 1 slot for method invocation */
93 moveml %d2/%d3/%d4/%d5/%d6/%d7/%a2/%a3/%a4/%a5/%fp,%sp@ /* save registers */
95 /* fetch arguments from vmargs data structure */
96 movel %sp@(12*4+1*4),%a3 /* method */
97 movel %sp@(12*4+2*4),%a2 /* arg array */
98 movel %sp@(12*4+3*4),%d2 /* arg count */
100 movel %a3, %sp@(12*4) /* copy method address to stackslot */
101 leal %sp@(12*4), %a3 /* and store that address in %a3 */
103 addal #(-12*4-6*8), %sp
104 moveml %d2/%d3/%d4/%d5/%d6/%d7/%a2/%a3/%a4/%a5/%fp,%sp@ /* save registers */
105 fmovemd %fp2/%fp3/%fp4/%fp5/%fp6/%fp7,%sp@(11*4) /* save registers */
107 /* fetch arguments from vmargs data structure */
108 movel %sp@(12*4+6*8+1*4),%a3 /* method */
109 movel %sp@(12*4+6*8+2*4),%a2 /* arg array */
110 movel %sp@(12*4+6*8+3*4),%d2 /* arg count */
112 movel %a3, %sp@(11*4+6*8) /* copy method address to stackslot */
113 leal %sp@(11*4+6*8), %a3 /* and store that address in %a3 */
116 moveal %sp, %a5 /* memorize stack */
118 tstl %d2 /* do we have arguments ? */
119 beq L_asm_vm_call_method_copy_done
120 movel %d2, %d3 /* create stackframe */
121 asll #3, %d3 /* number args * 8 */
123 moveal %sp, %a4 /* %a4 is temp stack pointer */
125 L_asm_vm_call_method_copy_loop:
127 movel %d3, %a4@(0) /* copy 4 bytes */
129 movel %d3, %a4@(4) /* a whole stack slot has been copied */
134 tstl %d2 /* do we have more arguments ? */
135 beq L_asm_vm_call_method_copy_done
136 br L_asm_vm_call_method_copy_loop
139 L_asm_vm_call_method_copy_done:
140 /* now we fake method invocation as it would happen from invokevirtual */
141 /* this is needed as we patch the caller site, so we need a writeable slot */
142 /* %a3 points to the address containing the method, %a3 == REG_METHODPTR */
147 L_asm_vm_call_method_return:
148 movel %a5, %sp /* pop arguments off stack */
150 #if defined(ENABLE_SOFTFLOAT)
151 moveml %sp@, %d2/%d3/%d4/%d5/%d6/%d7/%a2/%a3/%a4/%a5/%fp /* restore registers */
152 addal #(12*4),%sp /* restore stack */
154 fmovemd %sp@(12*4), %fp2/%fp3/%fp4/%fp5/%fp6/%fp7 /* restore registers */
155 moveml %sp@, %d2/%d3/%d4/%d5/%d6/%d7/%a2/%a3/%a4/%a5/%fp /* restore registers */
156 addal #(12*4+6*8),%sp /* restore stack */
158 moveal %d0, %a0 /* XXX return value in %a0, too, gcc sometimes expects addresses in %a0, wired */
159 asm_vm_call_method_end: /* symbol needed to insert method into avl tree */
160 rts /* return to c code */
162 /* asm_vm_call_method_exception_handler ********************************************************************
164 * calls void *builtin_throw_exception(java_objectheader *xptr) when no other handler is appropiate
165 * this functions gets called indirectly from asm_handle_exception, which back then moved xptr to %a2
166 * clear software design is in the eye of the beholder.
167 ************************************************************************************************************/
168 asm_vm_call_method_exception_handler:
169 movel %a2, %sp@- /* push xptr argument */
170 jsr builtin_throw_exception
171 lea %sp@(4), %sp /* pop arg off stack */
172 jmp L_asm_vm_call_method_return
175 /* asm_call_jit_compiler ************************************************************************************
176 * Invokes compiler for untranslated java methods.
177 * C prototype: void asm_call_jit_compiler(void);
178 * BUT: this does not match reality, arguments _ARE_ passed via createcompilerstub and asm_vm_call_method...
179 * arguments passed via %a2(methodinfo) == REG_ATMP1
180 * %a3(mptr) == REG_ATMP2
181 ************************************************************************************************************/
182 asm_call_jit_compiler:
183 addal #(-4*4),%sp /* create stackframe to save registers */
184 moveml %a0/%a1/%d0/%d1,%sp@ /* save volatile registers */
185 #if !defined(ENABLE_SOFTFLOAT)
187 fmovemd %fp0/%fp1, %sp@
188 movel %sp@(8*4), %sp@-
191 movel %sp@(4*4), %sp@- /* push arguments onto stack (ra)*/
192 pea %sp@(4*4+8) /* the old stack pointer*/
194 movel %a3,%sp@- /* mptr */
195 movel %a2,%sp@- /* methodinfo */
197 /* C prototype: u1 *jit_asm_compile(methodinfo *m, u1 *mptr, u1 *sp, u1 *ra); */
198 jsr jit_asm_compile /* invoke compiler */
199 addal #(4*4),%sp /* pop arguments off stack */
200 moveal %d0, %a2 /* to tmp register */
202 #if !defined(ENABLE_SOFTFLOAT)
203 fmovemd %sp@, %fp0/%fp1
207 moveml %sp@,%a0/%a1/%d0/%d1 /* restore volatile registers */
208 addal #(4*4),%sp /* remove stackframe */
210 tstl %a2 /* check for exception */
211 beq L_asm_call_jit_compiler_exception
213 jmp %a2@ /* invoke java method */
214 jsr 0 /* we should not ever return here */
216 L_asm_call_jit_compiler_exception:
217 jsr exceptions_get_and_clear_exception /* exception object in %d0 now */
218 moveal %d0, %a2 /* move exception object into sptr register */
219 moveal %sp@+, %a3 /* pop return address into exception address reg */
220 jmp asm_handle_exception /* handle exception */
223 /* asm_patcher_wrapper ********************************************************
225 prepares arguments on stack
226 calls patcher_wrapper signature: java_objectheader *patcher_wrapper(u1 *sp, u1 *pv, u1 *ra);
231 16 pointer to virtual java_objectheader
232 12 last byte of machine code (xmcode)
233 8 machine code (which is patched back later)
234 4 unresolved field reference
235 0 patcher function pointer to call
236 *******************************************************************************/
239 /* save scratch registers */
245 #if defined(ENABLE_SOFTFLOAT)
246 /* calculate original value of sp */
251 fmovemd %fp0/%fp1, %sp@
257 clrl %sp@- /* pass ra */
258 clrl %sp@- /* pass pv, if null use findmethod */
259 movel %d0, %sp@- /* pass sp of patcher stub */
260 jsr patcher_wrapper /* return value in %d0 */
262 lea %sp@(3*4), %sp /* pop arguments off stack */
263 tst %d0 /* test if exception occured */
264 bne L_asm_patcher_wrapper_exception
266 #if !defined(ENABLE_SOFTFLOAT)
267 fmovemd %sp@, %fp0/%fp1
275 lea %sp@(6*4), %sp /* restore stack and remove patcher stub*/
276 rts /* back to jit code */
278 L_asm_patcher_wrapper_exception:
279 /* WARNING: the stack is still disturbed, look at asm_patcher_wrapper for details */
280 /* we do not need to restore the content of the registers, I hope */
281 #if !defined(ENABLE_SOFTFLOAT)
287 lea %sp@(5*4), %sp /* restore stack and remove patcher stub*/
288 movel %sp@+, %d4 /* restore REG_ITMP3, stored in emit_patcher_stubs */
289 moveal %d0, %a2 /* xptr, pointer to exception object */
290 moveal %sp@+, %a3 /* pop return address into exception address register */
291 jmp asm_handle_exception /* handle exception */
292 illegal /* XXX: we never come back */
295 asm_abstractmethoderror:
297 /* asm_handle_exception ********************************************************
299 * This function handles an exception. It does not use the usual calling *
300 * conventions. The exception pointer is passed in REG_ATMP1 and the *
301 * pc from the exception raising position is passed in REG_ATMP2. It searches *
302 * the local exception table for a handler. If no one is found, it unwinds *
303 * stacks and continues searching the callers. *
305 * void asm_handle_exception (void);
306 * exception object pointer...%a2 exception raising address...%a3 *
308 *******************************************************************************/
309 asm_handle_nat_exception:
311 asm_handle_exception:
312 L_asm_handle_exception_stack_loop:
313 /* save temporary registers */
318 #if !defined(ENABLE_SOFTFLOAT)
320 fmovemd %fp0, %sp@(0)
321 fmovemd %fp1, %sp@(8)
324 /* we need the dseg, figure it out */
325 movel %a3, %sp@- /* push ra argument */
326 jsr md_codegen_get_pv_from_pc /* pv in %d0 now */
327 movel %d0, %d2 /* move to safe register */
328 lea %sp@(4), %sp /* pop args off stack */
330 /* now call the following c function */
331 /* u1 *exceptions_handle_exception(java_objectheader *xptr, u1 *xpc, u1 *pv, u1 *sp) */
332 #if !defined(ENABLE_SOFTFLOAT)
340 jsr exceptions_handle_exception /* %d0 is address of handler or 0 when not catched */
341 lea %sp@(4*4), %sp /* pop args off stack */
343 beq L_asm_handle_exception_not_catched
345 /* %d0 contains address of exception handler */
348 /* restore temporary registers */
353 #if !defined(ENABLE_SOFTFLOAT)
354 fmovemd %fp0, %sp@(0)
355 fmovemd %fp1, %sp@(8)
361 L_asm_handle_exception_not_catched:
362 /* we did not find an exception handler in this stackframe */
363 /* remove this frame and search in the one above */
364 /* %a2 containts exception object ptr, %d2 the actual pv */
366 /* remove temporary registers stored */
367 #if !defined(ENABLE_SOFTFLOAT)
368 addal #4*4 + 8*2, %sp
374 movel %a3@(FrameSize), %d2
377 addal %d2, %a0 /* %a0 now points to top of stackframe, where saved regs are */
379 /* the saved registers have to be restored */
380 /* XXX ugly hack: intsave and adrsave share one field */
381 movel %a3@(IntSave), %d0
382 andil #0x0000ffff, %d0 /* this is IntSave */
384 beq L_asm_handle_ex_int_done
388 beq L_asm_handle_ex_int_done
392 beq L_asm_handle_ex_int_done
395 L_asm_handle_ex_int_done:
397 movel %a3@(IntSave), %d0
398 andil #0xffff0000, %d0 /* this is AdrSave */
404 beq L_asm_handle_ex_adr_done
408 beq L_asm_handle_ex_adr_done
412 beq L_asm_handle_ex_adr_done
416 L_asm_handle_ex_adr_done:
418 #if !defined(ENABLE_SOFTFLOAT)
419 movel %a3@(FltSave), %d0
421 beq L_asm_handle_ex_flt_done
422 fmovemd %a0@(-8), %fp7
425 beq L_asm_handle_ex_flt_done
426 fdmoved %a0@(-16), %fp6
429 beq L_asm_handle_ex_flt_done
430 fdmoved %a0@(-24), %fp5
432 L_asm_handle_ex_flt_done:
436 addal %d2, %sp /* remove old stackframe */
437 moveal %sp@+, %a3 /* make return address, new exception rasing address */
438 subal #2, %a3 /* it was a jsr %aX, which is 4 bytes long */
439 jmp L_asm_handle_exception_stack_loop
447 * These are local overrides for various environment variables in Emacs.
448 * Please do not remove this and leave it at the end of the file, where
449 * Emacs will automagically detect them.
450 * ---------------------------------------------------------------------
453 * indent-tabs-mode: t
457 * vim:noexpandtab:sw=4:ts=4: