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_abstractmethoderror
47 .globl asm_handle_exception
48 .globl asm_handle_nat_exception
51 * This functions implement the C prototyped funtion
52 * java_objectheader *asm_vm_call_method(methodinfo *m, s4 vmargscount,vm_arg *vmargs);
53 * the _int, _long, _float, _double are used for different return types
55 * The function may still be uncompiled, so the jit compiler gets invoked.
60 /* this is the method header see src/vm/jit/methodheader.h */
64 .long 0 /* line number table start */
65 .long 0 /* line number table size */
69 .long 0 /* frame size */
70 .long 0 /* codeinfo pointer */
74 This method gets called with 3 arguments:
75 1st arg: addres of method to call (fake invokevirtual here)
76 2nd arg: uint64_t array of argument registers followed by stack
77 3rd arg: number of 8 byte stack slots to be copied.
79 coldifire does not use any argument registers, so just the stack has to be copied
82 asm_vm_call_method_int:
83 asm_vm_call_method_long:
84 asm_vm_call_method_float:
85 asm_vm_call_method_double:
87 #if defined(ENABLE_SOFTFLOAT)
88 addal #(-12*4),%sp /* create stackframe to save registers, and 1 slot for method invocation */
89 moveml %d2/%d3/%d4/%d5/%d6/%d7/%a2/%a3/%a4/%a5/%fp,%sp@ /* save registers */
91 /* fetch arguments from vmargs data structure */
92 movel %sp@(12*4+1*4),%a3 /* method */
93 movel %sp@(12*4+2*4),%a2 /* arg array */
94 movel %sp@(12*4+3*4),%d2 /* arg count */
96 movel %a3, %sp@(12*4) /* copy method address to stackslot */
97 leal %sp@(12*4), %a3 /* and store that address in %a3 */
99 addal #(-12*4-6*8), %sp
100 moveml %d2/%d3/%d4/%d5/%d6/%d7/%a2/%a3/%a4/%a5/%fp,%sp@ /* save registers */
101 fmovemd %fp2/%fp3/%fp4/%fp5/%fp6/%fp7,%sp@(11*4) /* save registers */
103 /* fetch arguments from vmargs data structure */
104 movel %sp@(12*4+6*8+1*4),%a3 /* method */
105 movel %sp@(12*4+6*8+2*4),%a2 /* arg array */
106 movel %sp@(12*4+6*8+3*4),%d2 /* arg count */
108 movel %a3, %sp@(12*4+6*8) /* copy method address to stackslot */
109 leal %sp@(12*4+6*8), %a3 /* and store that address in %a3 */
112 moveal %sp, %a5 /* memorize stack */
114 tstl %d2 /* do we have arguments ? */
115 beq L_asm_vm_call_method_copy_done
116 movel %d2, %d3 /* create stackframe */
117 asll #3, %d3 /* number args * 8 */
119 moveal %sp, %a4 /* %a4 is temp stack pointer */
121 L_asm_vm_call_method_copy_loop:
123 movel %d3, %a4@(0) /* copy 4 bytes */
125 movel %d3, %a4@(4) /* a whole stack slot has been copied */
130 tstl %d2 /* do we have more arguments ? */
131 beq L_asm_vm_call_method_copy_done
132 br L_asm_vm_call_method_copy_loop
135 L_asm_vm_call_method_copy_done:
136 /* now we fake method invocation as it would happen from invokevirtual */
137 /* this is needed as we patch the caller site, so we need a writeable slot */
138 /* %a3 points to the address containing the method, %a3 == REG_METHODPTR */
143 L_asm_vm_call_method_return:
144 movel %a5, %sp /* pop arguments off stack */
146 #if defined(ENABLE_SOFTFLOAT)
147 moveml %sp@, %d2/%d3/%d4/%d5/%d6/%d7/%a2/%a3/%a4/%a5/%fp /* restore registers */
148 addal #(12*4),%sp /* restore stack */
150 fmovemd %sp@(12*4), %fp2/%fp3/%fp4/%fp5/%fp6/%fp7 /* restore registers */
151 moveml %sp@, %d2/%d3/%d4/%d5/%d6/%d7/%a2/%a3/%a4/%a5/%fp /* restore registers */
152 addal #(12*4+6*8),%sp /* restore stack */
154 moveal %d0, %a0 /* XXX return value in %a0, too, gcc sometimes expects addresses in %a0, wired */
155 asm_vm_call_method_end: /* symbol needed to insert method into avl tree */
156 rts /* return to c code */
158 /* asm_vm_call_method_exception_handler ********************************************************************
160 * calls void *builtin_throw_exception(java_objectheader *xptr) when no other handler is appropiate
161 * this functions gets called indirectly from asm_handle_exception, which back then moved xptr to %a2
162 * clear software design is in the eye of the beholder.
163 ************************************************************************************************************/
164 asm_vm_call_method_exception_handler:
165 movel %a2, %sp@- /* push xptr argument */
166 jsr builtin_throw_exception
167 lea %sp@(4), %sp /* pop arg off stack */
168 jmp L_asm_vm_call_method_return
171 asm_abstractmethoderror:
173 /* asm_handle_exception ********************************************************
175 * This function handles an exception. It does not use the usual calling *
176 * conventions. The exception pointer is passed in REG_ATMP1 and the *
177 * pc from the exception raising position is passed in REG_ATMP2. It searches *
178 * the local exception table for a handler. If no one is found, it unwinds *
179 * stacks and continues searching the callers. *
181 * void asm_handle_exception (void);
182 * exception object pointer...%a2 exception raising address...%a3 *
184 *******************************************************************************/
185 asm_handle_nat_exception:
187 asm_handle_exception:
188 L_asm_handle_exception_stack_loop:
189 /* save temporary registers */
194 #if !defined(ENABLE_SOFTFLOAT)
196 fmovemd %fp0, %sp@(0)
197 fmovemd %fp1, %sp@(8)
200 /* we need the dseg, figure it out */
201 movel %a3, %sp@- /* push ra argument */
202 jsr md_codegen_get_pv_from_pc /* pv in %d0 now */
203 movel %d0, %d2 /* move to safe register */
204 lea %sp@(4), %sp /* pop args off stack */
206 /* now call the following c function */
207 /* u1 *exceptions_handle_exception(java_objectheader *xptr, u1 *xpc, u1 *pv, u1 *sp) */
208 #if !defined(ENABLE_SOFTFLOAT)
216 jsr exceptions_handle_exception /* %d0 is address of handler or 0 when not catched */
217 lea %sp@(4*4), %sp /* pop args off stack */
219 beq L_asm_handle_exception_not_catched
221 /* %d0 contains address of exception handler */
224 /* restore temporary registers */
229 #if !defined(ENABLE_SOFTFLOAT)
230 fmovemd %fp0, %sp@(0)
231 fmovemd %fp1, %sp@(8)
237 L_asm_handle_exception_not_catched:
238 /* we did not find an exception handler in this stackframe */
239 /* remove this frame and search in the one above */
240 /* %a2 containts exception object ptr, %d2 the actual pv */
242 /* remove temporary registers stored */
243 #if !defined(ENABLE_SOFTFLOAT)
244 addal #4*4 + 8*2, %sp
250 movel %a3@(FrameSize), %d2
253 addal %d2, %a0 /* %a0 now points to top of stackframe, where saved regs are */
255 /* the saved registers have to be restored */
256 /* XXX ugly hack: intsave and adrsave share one field */
257 movel %a3@(IntSave), %d0
258 andil #0x0000ffff, %d0 /* this is IntSave */
260 beq L_asm_handle_ex_int_done
264 beq L_asm_handle_ex_int_done
268 beq L_asm_handle_ex_int_done
271 L_asm_handle_ex_int_done:
273 movel %a3@(IntSave), %d0
274 andil #0xffff0000, %d0 /* this is AdrSave */
280 beq L_asm_handle_ex_adr_done
284 beq L_asm_handle_ex_adr_done
288 beq L_asm_handle_ex_adr_done
292 L_asm_handle_ex_adr_done:
294 #if !defined(ENABLE_SOFTFLOAT)
295 movel %a3@(FltSave), %d0
297 beq L_asm_handle_ex_flt_done
298 fmovemd %a0@(-8), %fp7
301 beq L_asm_handle_ex_flt_done
302 fdmoved %a0@(-16), %fp6
305 beq L_asm_handle_ex_flt_done
306 fdmoved %a0@(-24), %fp5
308 L_asm_handle_ex_flt_done:
312 addal %d2, %sp /* remove old stackframe */
313 moveal %sp@+, %a3 /* make return address, new exception rasing address */
314 subal #2, %a3 /* it was a jsr %aX, which is 4 bytes long */
315 jmp L_asm_handle_exception_stack_loop
323 * These are local overrides for various environment variables in Emacs.
324 * Please do not remove this and leave it at the end of the file, where
325 * Emacs will automagically detect them.
326 * ---------------------------------------------------------------------
329 * indent-tabs-mode: t
333 * vim:noexpandtab:sw=4:ts=4: