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 <sys/syscall.h>
32 #include "vm/jit/arm/md-asm.h"
34 #include "vm/jit/methodheader.h"
42 /* export functions ***********************************************************/
44 .globl asm_vm_call_method
45 .globl asm_vm_call_method_int
46 .globl asm_vm_call_method_long
47 .globl asm_vm_call_method_float
48 .globl asm_vm_call_method_double
49 .globl asm_vm_call_method_exception_handler
50 .globl asm_vm_call_method_end
52 .globl asm_call_jit_compiler
54 .globl asm_handle_exception
55 .globl asm_handle_nat_exception
57 .globl asm_abstractmethoderror
62 /* asm_vm_call_method **********************************************************
64 This function calls a Java-method (which possibly needs compilation)
65 with up to 4 address parameters.
67 This functions calls the JIT-compiler which eventually translates the
68 method into machine code.
70 *******************************************************************************/
74 .word 0 /* catch type all */
75 .word 0 /* handler pc */
77 .word 0 /* start pc */
78 .word 1 /* extable size */
79 .word 0 /* line number table start */
80 .word 0 /* line number table size */
84 .word 0 /* FrameSize */
85 .word 0 /* CodeinfoPointer */
88 asm_vm_call_method_int:
89 asm_vm_call_method_long:
90 /* asm_vm_call_method_float:
91 asm_vm_call_method_double: */
92 SAVE_SCRATCH_REGISTERS /* save our personal scratch regs */
93 stmfd sp!, {v1} /* V1 is used to remember SP */
94 str a0, [sp, #-4]! /* store methods entrypoint */
96 mov v1, sp /* remember SP */
98 mov itmp1, a1 /* address of data structure */
99 mov itmp3, a2 /* stack argument count */
101 ldr a0, [itmp1], #8 /* load argument registers */
106 cmp itmp3, #0 /* do we have stack arguments? */
107 ble asm_calljava_copyfinish /* no -> do not care :-) */
110 sub sp, sp, itmp3, lsl #3 /* create stackframe for arguments */
111 asm_calljava_copyloop: /* reorder stack arguments! */
112 ldr ip, [itmp1], #4 /* load argument */
113 str ip, [sp, itmp2] /* store argument on stack */
114 add itmp2, itmp2, #4 /* next stackslot */
115 ldr ip, [itmp1], #4 /* load argument */
116 str ip, [sp, itmp2] /* store argument on stack */
117 add itmp2, itmp2, #4 /* next stackslot */
118 subs itmp3, itmp3, #1 /* next argument */
119 bgt asm_calljava_copyloop
121 asm_calljava_copyfinish:
122 mov mptr, v1 /* set method pointer */
124 /* REMEMBER: do the method call just like in java! */
125 ldr ip, [mptr] /* fake virtual function call */
129 sub ip, pc, #(fake - asm_vm_call_method)+8
131 mov sp, v1 /* restore SP */
132 add sp, sp, #4 /* free fake address */
134 RESTORE_SCRATCH_REGS_AND_RETURN /* return to caller, restore regs */
136 asm_vm_call_method_exception_handler:
137 mov a0, xptr /* exception pointer is arg1 */
138 bl builtin_throw_exception /* throw the exception */
139 mov res1, #0 /* return NULL */
140 mov res2, #0 /* return NULL */
141 mov sp, v1 /* restore SP */
142 add sp, sp, #4 /* free fake address */
144 RESTORE_SCRATCH_REGS_AND_RETURN /* return to caller, restore regs */
146 asm_vm_call_method_float:
149 asm_vm_call_method_double:
153 asm_vm_call_method_end:
156 /****************** function asm_call_jit_compiler *****************************
158 * Invokes the compiler for untranslated JavaVM methods. *
159 * What this method does: *
160 * - save args and LR *
161 * - fire up jit_compile (pass methodinfo pointer) *
162 * - try to find out where to write back the new method pointer *
163 * - restore args and LR *
164 * - check for exceptions *
165 * - eventually write back new method pointer *
166 * - call jit code (wich will then return to caller) *
168 * These methods can call us: codegen_compilerstub & asm_calljavafunction *
169 * ATTENTION: use REG_ITMP1 to pass methodinfo pointer to me! *
171 *******************************************************************************/
173 #define MYSTACKSIZE (6*4)
175 asm_call_jit_compiler:
176 SAVE_ARGUMENT_REGISTERS /* save our argument registers & LR */
177 sub sp, sp, #4 /* keep stack 8-byte aligned */
179 mov a0, itmp1 /* pass methodinfo pointer */
180 mov a1, mptr /* pass method pointer */
181 add a2, sp, #MYSTACKSIZE /* pass Java sp */
182 mov a3, lr /* pass Java RA (correct for leafs) */
184 mov itmp1, res1 /* save pointer to new jit-code */
186 tst itmp1,itmp1 /* check for exeption */
187 beq L_asm_call_jit_compiler_exception
189 add sp, sp, #4 /* keep stack 8-byte aligned */
190 RESTORE_ARGUMENT_REGISTERS /* load our argument registers & LR */
193 mov pc, ip /* call jit-code */
195 L_asm_call_jit_compiler_exception:
196 bl exceptions_get_and_clear_exception
197 mov xptr, res1 /* get exception */
199 add sp, sp, #4 /* keep stack 8-byte aligned */
200 RESTORE_ARGUMENT_REGISTERS /* load LR */
202 sub xpc, lr, #4 /* xpc = instruction that called us */
203 b asm_handle_nat_exception
206 /********************* function asm_handle_exception ***************************
208 * This function handles an exception. It does not use the usual calling *
209 * conventions. The exception pointer is passed in REG_ITMP1 and the *
210 * pc from the exception raising position is passed in REG_ITMP2. It searches *
211 * the local exception table for a handler. If no one is found, it unwinds *
212 * stacks and continues searching the callers. *
214 * void asm_handle_exception (exceptionptr, exceptionpc); *
216 *******************************************************************************/
218 asm_handle_nat_exception:
219 /*TODO:maybe make a macro out of it!!!*/
220 SAVE_ARGUMENT_REGISTERS
222 bl md_codegen_get_pv_from_pc
224 RESTORE_ARGUMENT_REGISTERS
227 asm_handle_exception:
228 stmfd sp!, {r0 - r3} /* save possible used registers */
229 mov itmp3, #1 /* set maybe-leaf flag */
230 mov a3, #(4*4) /* prepare a3 for handle_exception */
232 asm_handle_exception_loop:
233 stmfd sp!, {ip,lr} /* call exception helper here! */
234 mov a0, xptr /* pass exception pointer */
235 mov a1, xpc /* pass exception pointer */
236 mov a2, ip /* pass data segment pointer */
237 add a3, sp, a3 /* calculate Java sp into a3... */
239 bl exceptions_handle_exception
243 beq asm_handle_exception_not_catched
245 mov xpc, a0 /* move handlerpc into xpc */
246 tst itmp3,itmp3 /* if this is a lead method ... */
247 ldmnefd sp!, {r0 - r3} /* restore argument registers */
249 mov pc, xpc /* jump to handler */
251 asm_handle_exception_not_catched:
252 tst itmp3,itmp3 /* if this is a lead method ... */
253 addne sp, sp, #(4*4) /* remove maybe-leaf stackframe */
254 movne itmp3, #0 /* remove maybe-leaf flag */
256 ldr a2, [ip, #FrameSize] /* t2 = frame size */
257 add a0, sp, a2 /* t0 = pointer to save area */
258 ldr a1, [ip, #IsLeaf] /* t1 = is leaf procedure */
259 tst a1, a1 /* if is leaf ... */
260 ldreq lr, [a0, #-4]! /* ... restore RA */
261 mov xpc, lr /* the new xpc is RA */
263 ldr a1, [ip, #IntSave] /* t1 = saved int register count */
264 rsb a1, a1, #5 /* t1 = count of unsaved registers */
266 add pc, pc, a1, lsl #2 /* do not load unsaved registers */
267 ldr v1, [a0, #-20] /* ... but restore the other ones */
273 add sp, sp, a2 /* unwind stack (using t2) */
274 mov a3, #0 /* prepare a3 for handle_exception */
276 /*TODO:maybe make a macro out of it!!!*/
277 SAVE_ARGUMENT_REGISTERS
279 bl md_codegen_get_pv_from_pc
281 RESTORE_ARGUMENT_REGISTERS
283 b asm_handle_exception_loop
286 /* asm_abstractmethoderror *****************************************************
288 Creates and throws an AbstractMethodError.
290 *******************************************************************************/
292 asm_abstractmethoderror:
293 stmfd sp!, {lr} /* save return address */
294 add a0, sp, #(1*4) /* pass java sp */
295 mov a1, lr /* pass exception address */
296 bl exceptions_asm_new_abstractmethoderror
297 ldmfd sp!, {lr} /* restore return address */
299 mov xptr, res1 /* get exception pointer */
300 sub xpc, lr, #4 /* exception address is ra - 4 */
301 b asm_handle_nat_exception
304 /********************* function asm_cacheflush *********************************
306 * TODO: document me *
308 * void asm_cacheflush(void *p, s4 size); *
310 *******************************************************************************/
312 .equ sys_cacheflush,__ARM_NR_cacheflush /* syscall number for cache flushing */
318 #if defined(__ARM_EABI__)
319 /* According to EABI, the syscall number should be passed via R7,
320 see "http://wiki.debian.org/ArmEabiPort" for additional details. */
324 add r7, r7, #0x000002
328 /* TWISTI: required on iyonix, maybe a linux-2.4 bug */
335 #if defined(__ARM_EABI__)
342 /* disable exec-stacks ********************************************************/
344 #if defined(__linux__) && defined(__ELF__)
345 .section .note.GNU-stack,"",%progbits
350 * These are local overrides for various environment variables in Emacs.
351 * Please do not remove this and leave it at the end of the file, where
352 * Emacs will automagically detect them.
353 * ---------------------------------------------------------------------
356 * indent-tabs-mode: t
360 * vim:noexpandtab:sw=4:ts=4: