1 /* src/vm/jit/arm/asmpart.S - Java-C interface functions for ARM
3 Copyright (C) 1996-2005, 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
30 #include "vm/jit/arm/md-asm.h"
32 #include "vm/jit/methodheader.h"
40 /* export functions ***********************************************************/
42 .globl asm_vm_call_method
43 .globl asm_vm_call_method_int
44 .globl asm_vm_call_method_long
45 .globl asm_vm_call_method_float
46 .globl asm_vm_call_method_double
47 .globl asm_vm_call_method_exception_handler
48 .globl asm_vm_call_method_end
50 .globl asm_call_jit_compiler
52 .globl asm_handle_exception
53 .globl asm_handle_nat_exception
55 .globl asm_abstractmethoderror
59 #if !defined(ENABLE_THREADS)
61 .word _no_threads_exceptionptr
65 /* asm_vm_call_method **********************************************************
67 This function calls a Java-method (which possibly needs compilation)
68 with up to 4 address parameters.
70 This functions calls the JIT-compiler which eventually translates the
71 method into machine code.
73 *******************************************************************************/
77 .word 0 /* catch type all */
78 .word 0 /* handler pc */
80 .word 0 /* start pc */
81 .word 1 /* extable size */
82 .word 0 /* line number table start */
83 .word 0 /* line number table size */
88 .word 0 /* FrameSize */
89 .word 0 /* CodeinfoPointer */
92 asm_vm_call_method_int:
93 asm_vm_call_method_long:
94 /* asm_vm_call_method_float:
95 asm_vm_call_method_double: */
96 SAVE_SCRATCH_REGISTERS /* save our personal scratch regs */
97 stmfd sp!, {v1} /* V1 is used to remember SP */
98 str a0, [sp, #-4]! /* store methods entrypoint */
100 mov v1, sp /* remember SP */
102 mov itmp1, a1 /* address of data structure */
103 mov itmp3, a2 /* stack argument count */
105 ldr a0, [itmp1], #8 /* load argument registers */
110 cmp itmp3, #0 /* do we have stack arguments? */
111 ble asm_calljava_copyfinish /* no -> do not care :-) */
114 sub sp, sp, itmp3, lsl #3 /* create stackframe for arguments */
115 asm_calljava_copyloop: /* reorder stack arguments! */
116 ldr ip, [itmp1], #4 /* load argument */
117 str ip, [sp, itmp2] /* store argument on stack */
118 add itmp2, itmp2, #4 /* next stackslot */
119 ldr ip, [itmp1], #4 /* load argument */
120 str ip, [sp, itmp2] /* store argument on stack */
121 add itmp2, itmp2, #4 /* next stackslot */
122 subs itmp3, itmp3, #1 /* next argument */
123 bgt asm_calljava_copyloop
125 asm_calljava_copyfinish:
126 mov mptr, v1 /* set method pointer */
128 /* REMEMBER: do the method call just like in java! */
129 ldr ip, [mptr] /* fake virtual function call */
133 sub ip, pc, #(fake - asm_vm_call_method)+8
135 mov sp, v1 /* restore SP */
136 add sp, sp, #4 /* free fake address */
138 RESTORE_SCRATCH_REGS_AND_RETURN /* return to caller, restore regs */
140 asm_vm_call_method_exception_handler:
141 mov a0, xptr /* exception pointer is arg1 */
142 bl builtin_throw_exception /* throw the exception */
143 mov res1, #0 /* return NULL */
144 mov res2, #0 /* return NULL */
145 mov sp, v1 /* restore SP */
146 add sp, sp, #4 /* free fake address */
148 RESTORE_SCRATCH_REGS_AND_RETURN /* return to caller, restore regs */
150 asm_vm_call_method_float:
153 asm_vm_call_method_double:
157 asm_vm_call_method_end:
160 /****************** function asm_call_jit_compiler *****************************
162 * Invokes the compiler for untranslated JavaVM methods. *
163 * What this method does: *
164 * - save args and LR *
165 * - fire up jit_compile (pass methodinfo pointer) *
166 * - try to find out where to write back the new method pointer *
167 * - restore args and LR *
168 * - check for exceptions *
169 * - eventually write back new method pointer *
170 * - call jit code (wich will then return to caller) *
172 * These methods can call us: codegen_compilerstub & asm_calljavafunction *
173 * ATTENTION: use REG_ITMP1 to pass methodinfo pointer to me! *
175 *******************************************************************************/
177 #define MYSTACKSIZE (6*4)
179 asm_call_jit_compiler:
180 SAVE_ARGUMENT_REGISTERS /* save our argument registers & LR */
181 sub sp, sp, #4 /* keep stack 8-byte aligned */
183 mov a0, itmp1 /* pass methodinfo pointer */
184 mov a1, mptr /* pass method pointer */
185 add a2, sp, #MYSTACKSIZE /* pass Java sp */
186 mov a3, lr /* pass Java RA (correct for leafs) */
188 mov itmp1, res1 /* save pointer to new jit-code */
190 tst itmp1,itmp1 /* check for exeption */
191 beq L_asm_call_jit_compiler_exception
193 add sp, sp, #4 /* keep stack 8-byte aligned */
194 RESTORE_ARGUMENT_REGISTERS /* load our argument registers & LR */
197 mov pc, ip /* call jit-code */
199 L_asm_call_jit_compiler_exception:
200 bl exceptions_get_and_clear_exception
201 mov xptr, res1 /* get exception */
203 add sp, sp, #4 /* keep stack 8-byte aligned */
204 RESTORE_ARGUMENT_REGISTERS /* load LR */
206 sub xpc, lr, #4 /* xpc = instruction that called us */
207 b asm_handle_nat_exception
210 /********************* function asm_handle_exception ***************************
212 * This function handles an exception. It does not use the usual calling *
213 * conventions. The exception pointer is passed in REG_ITMP1 and the *
214 * pc from the exception raising position is passed in REG_ITMP2. It searches *
215 * the local exception table for a handler. If no one is found, it unwinds *
216 * stacks and continues searching the callers. *
218 * void asm_handle_exception (exceptionptr, exceptionpc); *
220 *******************************************************************************/
222 asm_handle_nat_exception:
223 /*TODO:maybe make a macro out of it!!!*/
224 SAVE_ARGUMENT_REGISTERS
226 bl md_codegen_get_pv_from_pc
228 RESTORE_ARGUMENT_REGISTERS
231 asm_handle_exception:
232 stmfd sp!, {r0 - r3} /* save possible used registers */
233 mov itmp3, #1 /* set maybe-leaf flag */
234 mov a3, #(4*4) /* prepare a3 for handle_exception */
236 asm_handle_exception_loop:
237 stmfd sp!, {ip,lr} /* call exception helper here! */
238 mov a0, xptr /* pass exception pointer */
239 mov a1, xpc /* pass exception pointer */
240 mov a2, ip /* pass data segment pointer */
241 add a3, sp, a3 /* calculate Java sp into a3... */
243 bl exceptions_handle_exception
247 beq asm_handle_exception_not_catched
249 mov xpc, a0 /* move handlerpc into xpc */
250 tst itmp3,itmp3 /* if this is a lead method ... */
251 ldmnefd sp!, {r0 - r3} /* restore argument registers */
253 mov pc, xpc /* jump to handler */
255 asm_handle_exception_not_catched:
256 tst itmp3,itmp3 /* if this is a lead method ... */
257 addne sp, sp, #(4*4) /* remove maybe-leaf stackframe */
258 movne itmp3, #0 /* remove maybe-leaf flag */
260 ldr a2, [ip, #FrameSize] /* t2 = frame size */
261 add a0, sp, a2 /* t0 = pointer to save area */
262 ldr a1, [ip, #IsLeaf] /* t1 = is leaf procedure */
263 tst a1, a1 /* if is leaf ... */
264 ldreq lr, [a0, #-4]! /* ... restore RA */
265 mov xpc, lr /* the new xpc is RA */
267 ldr a1, [ip, #IntSave] /* t1 = saved int register count */
268 rsb a1, a1, #5 /* t1 = count of unsaved registers */
270 add pc, pc, a1, lsl #2 /* do not load unsaved registers */
271 ldr v1, [a0, #-20] /* ... but restore the other ones */
277 add sp, sp, a2 /* unwind stack (using t2) */
278 mov a3, #0 /* prepare a3 for handle_exception */
280 /*TODO:maybe make a macro out of it!!!*/
281 SAVE_ARGUMENT_REGISTERS
283 bl md_codegen_get_pv_from_pc
285 RESTORE_ARGUMENT_REGISTERS
287 b asm_handle_exception_loop
290 /* asm_abstractmethoderror *****************************************************
292 Creates and throws an AbstractMethodError.
294 *******************************************************************************/
296 asm_abstractmethoderror:
297 stmfd sp!, {lr} /* save return address */
298 add a0, sp, #(1*4) /* pass java sp */
299 mov a1, lr /* pass exception address */
300 bl exceptions_asm_new_abstractmethoderror
301 ldmfd sp!, {lr} /* restore return address */
303 mov xptr, res1 /* get exception pointer */
304 sub xpc, lr, #4 /* exception address is ra - 4 */
305 b asm_handle_nat_exception
308 /********************* function asm_cacheflush *********************************
310 * TODO: document me *
312 * void asm_cacheflush(void *p, s4 size); *
314 *******************************************************************************/
317 .equ sys_cacheflush, 0x9f0002
323 /* TWISTI: required on iyonix, maybe a linux-2.4 bug */
324 /* TODO: repeair this! */
325 /* cacheflush is messed up beyond all repair! */
335 /* disable exec-stacks ********************************************************/
337 #if defined(__linux__) && defined(__ELF__)
338 .section .note.GNU-stack,"",%progbits
343 * These are local overrides for various environment variables in Emacs.
344 * Please do not remove this and leave it at the end of the file, where
345 * Emacs will automagically detect them.
346 * ---------------------------------------------------------------------
349 * indent-tabs-mode: t
353 * vim:noexpandtab:sw=4:ts=4: