1 /* src/vm/jit/m68k/asmpart.S
8 #include "vm/jit/m68k/offsets.h"
10 #include "vm/jit/methodheader.h"
18 .globl asm_vm_call_method
19 .globl asm_vm_call_method_int
20 .globl asm_vm_call_method_long
21 .globl asm_vm_call_method_float
22 .globl asm_vm_call_method_double
23 .globl asm_vm_call_method_end
24 .globl asm_vm_call_method_exception_handler
26 .globl asm_call_jit_compiler
28 .globl asm_patcher_wrapper
30 .globl asm_getclassvalues_atomic
31 .globl asm_abstractmethoderror
32 .globl asm_criticalsections
34 .globl asm_handle_exception
35 .globl asm_handle_nat_exception
38 * This functions implement the C prototyped funtion
39 * java_objectheader *asm_vm_call_method(methodinfo *m, s4 vmargscount,vm_arg *vmargs);
40 * the _int, _long, _float, _double are used for different return types
42 * The function may still be uncompiled, so the jit compiler gets invoked.
47 /* this is the method header see src/vm/jit/methodheader.h */
49 .long 0 /* catch type all */
50 .long 0 /* handler pc */
52 .long 0 /* start pc */
53 .long 1 /* extable size */
54 .long 0 /* line number table start */
55 .long 0 /* line number table size */
60 .long 0 /* frame size */
61 .long 0 /* codeinfo pointer */
63 asm_vm_call_method_int:
64 asm_vm_call_method_long:
65 asm_vm_call_method_float:
66 asm_vm_call_method_double:
67 addal #(-11*4),%sp /* create stackframe to save registers */
68 moveml %d2/%d3/%d4/%d5/%d6/%d7/%a2/%a3/%a4/%a5/%fp,%sp@ /* save registers */
70 /* fetch arguments from vmargs data structure */
71 movel %sp@(11*4+1*4),%a2 /* methodinfo argument in atmp1 */
72 movel %sp@(11*4+3*4),%a3 /* args block */
73 movel %sp@(11*4+2*4),%d2 /* arg count */
75 moveal %sp, %a5 /* memorize stack */
76 tst %d2 /* do we have arguments ? */
77 beq L_asm_vm_call_method_copy_done
78 subql #1,%d2 /* simplifies offset calulation */
80 movel #(sizevmarg), %d0
83 addal %d0, %a0 /* %a0 points to last vmarg block */
86 L_asm_vm_call_copy_arg:
87 subql #1, %d2 /* why wasn't that here */
89 movel %a0@(offvmargdata+4), %d0
90 movel %d0,%sp@- /* push argument onto stack */
92 movel %a0@(offvmargtype), %d0 /* %d0 contains type of arg */
93 btstl #0, %d0 /* test if 2 word type */
94 beq L_asm_vm_call_copy_1_word_type
95 movel %a0@(offvmargdata), %d0 /* push second word onto stack */
97 L_asm_vm_call_copy_1_word_type:
100 tst %d2 /* arguments left ? */
101 bne L_asm_vm_call_copy_arg
103 L_asm_vm_call_method_copy_done:
105 leal asm_call_jit_compiler,%a4 /* we need to fake a invocation as it would happen from jit code */
106 movel %a4, call_jit_dummy /* we need a writeable memory location */
107 moveal call_jit_dummy, %a4 /* XXX do we have a race condition here ? */
110 L_asm_vm_call_method_return:
111 movel %a5, %sp /* pop arguments off stack */
112 moveml %sp@, %d2/%d3/%d4/%d5/%d6/%d7/%a2/%a3/%a4/%a5/%fp /* restore registers */
113 addal #(11*4),%sp /* restore stack */
114 moveal %d0, %a0 /* return value in %a0, too */
115 asm_vm_call_method_end: /* symbol needed to insert method into avl tree */
116 rts /* return to c code */
118 /* asm_vm_call_method_exception_handler ********************************************************************
120 * calls void *builtin_throw_exception(java_objectheader *xptr) when no other handler is appropiate
121 * this functions gets called indirectly from asm_handle_exception, which back then moved xptr to %a2
122 * clear software design is in the eye of the beholder.
123 ************************************************************************************************************/
124 asm_vm_call_method_exception_handler:
125 movel %a2, %sp@- /* push xptr argument */
126 jsr builtin_throw_exception
127 lea %sp@(4), %sp /* pop arg off stack */
129 jmp L_asm_vm_call_method_return
132 /* asm_call_jit_compiler ************************************************************************************
133 * Invokes compiler for untranslated java methods.
134 * C prototype: void asm_call_jit_compiler(void);
135 * BUT: this does not match reality, arguments _ARE_ passed via createcompilerstub and asm_vm_call_method...
136 * arguments passed via %a2(methodinfo) == REG_ATMP1
137 * %a3(mptr) == REG_ATMP2
138 ************************************************************************************************************/
139 asm_call_jit_compiler:
140 addal #(-4*4),%sp /* create stackframe to save registers */
141 moveml %a0/%a1/%d0/%d1,%sp@ /* save volatile registers */
143 movel %sp@(4*4),%sp@- /* push arguments onto stack (ra)*/
144 pea %sp@(4*4+4) /* the old stack pointer */
145 movel %a3,%sp@- /* mptr */
146 movel %a2,%sp@- /* methodinfo */
148 /* C prototype: u1 *jit_asm_compile(methodinfo *m, u1 *mptr, u1 *sp, u1 *ra); */
149 jsr jit_asm_compile /* invoke compiler */
150 lea %sp@(4*4),%sp /* pop arguments off stack */
151 moveal %d0, %a2 /* to tmp register */
153 moveml %sp@,%a0/%a1/%d0/%d1 /* restore volatile registers */
154 addal #(4*4),%sp /* remove stackframe */
156 tstl %a2 /* check for exception */
157 beq L_asm_call_jit_compiler_exception
159 jmp %a2@ /* invoke java method */
160 jsr 0 /* we should not ever return here */
162 L_asm_call_jit_compiler_exception:
163 jsr exceptions_get_and_clear_exception /* exception object in %d0 now */
164 moveal %d0, %a2 /* move exception object into sptr register */
165 moveal %sp@+, %a3 /* pop return address into exception address reg */
166 jmp asm_handle_exception /* handle exception */
169 /* asm_patcher_wrapper ********************************************************
171 prepares arguments on stack
172 calls patcher_wrapper signature: java_objectheader *patcher_wrapper(u1 *sp, u1 *pv, u1 *ra);
177 16 pointer to virtual java_objectheader
178 12 last byte of machine code (xmcode)
179 8 machine code (which is patched back later)
180 4 unresolved field reference
181 0 patcher function pointer to call
182 *******************************************************************************/
185 /* save scratch registers */
191 /* calculate original value of sp */
195 #if !defined(ENABLE_SOFTFLOAT)
200 clrl %sp@- /* pass ra */
201 clrl %sp@- /* pass pv, if null use findmethod */
202 movel %d0, %sp@- /* pass sp of patcher stub */
203 jsr patcher_wrapper /* return value in %d0 */
205 lea %sp@(3*4), %sp /* pop arguments off stack */
206 tst %d0 /* test if exception occured */
207 bne L_asm_patcher_wrapper_exception
209 #if !defined(ENABLE_SOFTFLOAT)
218 lea %sp@(6*4), %sp /* restore stack and remove patcher stub*/
219 rts /* back to jit code */
221 L_asm_patcher_wrapper_exception:
222 /* WARNING: the stack is still disturbed, look at asm_patcher_wrapper for details */
223 /* we do not need to restore the content of the registers, I hope */
224 #if !defined(ENABLE_SOFTFLOAT)
230 lea %sp@(6*4), %sp /* restore stack and remove patcher stub*/
231 moveal %d0, %a2 /* xptr, pointer to exception object */
232 moveal %sp@+, %a3 /* pop return address into exception address register */
233 jmp asm_handle_exception /* handle exception */
234 illegal /* XXX: we never come back */
236 /********************************************************************************
237 Reads a few values atomically.
239 void asm_getclassvalues_atomic(vftbl_t *super, vftbl_t *sub, castinfo *out);
244 ********************************************************************************/
245 asm_getclassvalues_atomic:
249 movel %a0@(offbaseval), %d0
250 movel %a0@(offdiffval), %d1
253 moveal %a0@(offbaseval), %a0
256 movel %d0, %a1@(offcast_super_baseval)
257 movel %d1, %a1@(offcast_super_diffval)
258 movel %a0, %a1@(offcast_sub_baseval)
262 asm_criticalsections:
263 #if defined(ENABLE_THREADS)
271 asm_abstractmethoderror:
273 /* asm_handle_exception ********************************************************
275 * This function handles an exception. It does not use the usual calling *
276 * conventions. The exception pointer is passed in REG_ATMP1 and the *
277 * pc from the exception raising position is passed in REG_ATMP2. It searches *
278 * the local exception table for a handler. If no one is found, it unwinds *
279 * stacks and continues searching the callers. *
281 * void asm_handle_exception (void);
282 * exception object pointer...%a2 exception raising address...%a3 *
284 *******************************************************************************/
285 asm_handle_nat_exception:
287 asm_handle_exception:
288 L_asm_handle_exception_stack_loop:
290 /* we need the dseg, figure it out */
291 movel %a3, %sp@- /* push ra argument */
292 jsr md_codegen_get_pv_from_pc /* pv in %d0 now */
293 movel %d0, %d2 /* move to safe register */
294 lea %sp@(4), %sp /* pop args off stack */
296 /* now call the following c function */
297 /* u1 *exceptions_handle_exception(java_objectheader *xptr, u1 *xpc, u1 *pv, u1 *sp) */
302 jsr exceptions_handle_exception /* %d0 is address of handler or 0 when not catched */
303 lea %sp@(4*4), %sp /* pop args off stack */
305 beq L_asm_handle_exception_not_catched
307 /* %d0 contains address of exception handler */
311 L_asm_handle_exception_not_catched:
312 /* we did not find an exception handler in this stackframe */
313 /* remove this frame and search in the one above */
314 /* %a2 containts exception object ptr, %d2 the actual pv */
316 movel %a3@(FrameSize), %d2
319 addal %d2, %a0 /* %a0 now points to top of stackframe, where saved regs are */
321 /* the saved registers have to be restored */
322 /* XXX ugly hack: intsave and adrsave share one field */
323 movel %a3@(IntSave), %d0
324 andil #0x0000ffff, %d0 /* this is IntSave */
326 beq L_asm_handle_ex_int_done
330 beq L_asm_handle_ex_int_done
334 beq L_asm_handle_ex_int_done
337 L_asm_handle_ex_int_done:
339 movel %a3@(IntSave), %d0
340 andil #0xffff0000, %d0 /* this is AdrSave */
342 beq L_handle_exception_nat_catched_no_adr
344 L_handle_exception_nat_catched_no_adr:
346 #if !defined(ENABLE_SOFTFLOAT)
351 addal %d2, %sp /* remove old stackframe */
352 moveal %sp@+, %a3 /* make return address, new exception rasing address */
353 subal #2, %a3 /* it was a jsr %aX, which is 4 bytes long */
354 jmp L_asm_handle_exception_stack_loop
362 * These are local overrides for various environment variables in Emacs.
363 * Please do not remove this and leave it at the end of the file, where
364 * Emacs will automagically detect them.
365 * ---------------------------------------------------------------------
368 * indent-tabs-mode: t
372 * vim:noexpandtab:sw=4:ts=4: