2 * tramp-hppa.c: JIT trampoline code for hppa
4 * Copyright (c) 2007 Randolph Chung
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
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10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
29 #include <mono/arch/hppa/hppa-codegen.h>
30 #include <mono/metadata/appdomain.h>
31 #include <mono/metadata/marshal.h>
32 #include <mono/metadata/tabledefs.h>
35 #include "mini-hppa.h"
37 /* sizeof (MonoLMF) == 320 + HPPA_STACK_LMF_OFFSET + linkage area (64 bytes)
38 * leave some room to spare
40 #define TRAMP_STACK_SIZE 512
41 /* Method-specific trampoline code fragment size */
42 #define METHOD_TRAMPOLINE_SIZE 128
43 /* Jump-specific trampoline code fragment size */
44 #define JUMP_TRAMPOLINE_SIZE 64
47 * mono_arch_get_unbox_trampoline:
49 * @addr: pointer to native code for @m
51 * when value type methods are called through the vtable we need to unbox the
52 * this argument. This method returns a pointer to a trampoline which does
53 * unboxing before calling the method
56 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
59 int this_pos = hppa_r26;
60 MonoDomain *domain = mono_domain_get ();
62 if (!mono_method_signature (m)->ret->byref && MONO_TYPE_ISSTRUCT (mono_method_signature (m)->ret))
65 mono_domain_lock (domain);
66 start = code = mono_code_manager_reserve (domain->code_mp, 20);
67 mono_domain_unlock (domain);
69 hppa_set (code, addr, hppa_r1);
70 hppa_ldo (code, sizeof (MonoObject), this_pos, this_pos);
71 hppa_bv (code, hppa_r0, hppa_r1);
74 mono_arch_flush_icache (start, code - start);
75 g_assert ((code - start) <= 20);
80 mono_arch_patch_callsite (guint8 *p, guint8 *addr)
82 guint32 *code = (void *)p;
83 /* Search for and patch the calling sequence
87 * CEE_CALL outputs the following sequence:
91 * bb,>=,n r1, 30, .+16
97 * XXXXXXXXXXXXXXXX <- code points here
100 /* Go back to the branching insn */
103 /* We can patch the code only if it is a direct call. In some cases
104 * we can reach here via a reg-indirect call. In that case we can't
107 if ((code[0] >> 26) == 0x39 && /* ble */
108 (code[-4] >> 26) == 0x31 && /* bb */
109 (code[-6] >> 26) == 0x08) /* ldil */ {
110 hppa_patch (&code[-6], addr);
111 mono_arch_flush_icache (&code[-6], 8);
113 printf("Can't patch callsite!\n");
118 mono_arch_patch_plt_entry (guint8 *code, guint8 *addr)
120 g_assert_not_reached ();
124 mono_arch_nullify_class_init_trampoline (guint8 *code8, gssize *regs)
126 guint32 *buf = (guint32 *)((unsigned long)code8 & ~3);
130 if (code[0] == 0x08000240) /* nop - already nullified */
132 g_assert ((code[0] >> 26) == 0x39); /* ble */
136 mono_arch_flush_icache (buf, 8);
141 mono_arch_nullify_plt_entry (guint8 *code)
143 g_assert_not_reached ();
146 #define ALIGN_TO(val,align) (((val) + ((align) - 1)) & ~((align) - 1))
149 * Stack frame description when the generic trampoline is called.
151 * --------------------
153 * -------------------
154 * incoming argument registers
155 * -------------------
157 * -------------------
160 mono_arch_create_trampoline_code (MonoTrampolineType tramp_type)
162 guint8 *buf, *code = NULL;
165 code = buf = mono_global_codeman_reserve (1024);
167 /* Trampoline is called with "method" in r20 */
168 hppa_stw (buf, hppa_r2, -20, hppa_sp);
169 hppa_copy (buf, hppa_sp, hppa_r1);
170 hppa_ldo (buf, TRAMP_STACK_SIZE, hppa_sp, hppa_sp);
172 /* Save the MonoLMF structure on the stack */
173 offset = HPPA_STACK_LMF_OFFSET + G_STRUCT_OFFSET (MonoLMF, regs);
174 for (i = 0; i < 32; i++) {
175 if (HPPA_IS_SAVED_GREG (i)) {
176 hppa_stw (buf, i, offset, hppa_r1);
177 offset += sizeof(ulong);
180 hppa_copy (buf, hppa_r1, hppa_r3);
181 hppa_set (buf, HPPA_STACK_LMF_OFFSET + G_STRUCT_OFFSET (MonoLMF, fregs), hppa_r1);
182 for (i = 0; i < 32; i++) {
183 if (HPPA_IS_SAVED_FREG (i)) {
184 hppa_fstdx (buf, i, hppa_r1, hppa_r3);
185 hppa_ldo (buf, sizeof(double), hppa_r1, hppa_r1);
188 /* Save the method info stored in r20 */
189 hppa_stw (buf, hppa_r20, HPPA_STACK_LMF_OFFSET + G_STRUCT_OFFSET (MonoLMF, method), hppa_r3);
190 hppa_stw (buf, hppa_r3, HPPA_STACK_LMF_OFFSET + G_STRUCT_OFFSET (MonoLMF, ebp), hppa_sp);
191 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
192 hppa_stw (buf, hppa_r0, HPPA_STACK_LMF_OFFSET + G_STRUCT_OFFSET (MonoLMF, eip), hppa_r3);
194 hppa_stw (buf, hppa_r2, HPPA_STACK_LMF_OFFSET + G_STRUCT_OFFSET (MonoLMF, eip), hppa_r3);
197 /* Save the incoming arguments too, before they can trashed by the
198 * call to the magic trampoline
200 offset = HPPA_STACK_LMF_OFFSET + sizeof (MonoLMF);
201 for (i = hppa_r23; i <= hppa_r26; i++) {
202 hppa_stw (buf, i, offset, hppa_r3);
203 offset += sizeof(ulong);
205 hppa_stw (buf, hppa_r28, offset, hppa_r3);
206 offset += sizeof(ulong);
207 offset = ALIGN_TO (offset, sizeof(double));
208 hppa_ldo (buf, offset, hppa_r3, hppa_r1);
209 for (i = hppa_fr4; i <= hppa_fr7; i++) {
210 hppa_fstds (buf, i, 0, hppa_r1);
211 hppa_ldo (buf, sizeof(double), hppa_r1, hppa_r1);
214 /* Call mono_get_lmf_addr */
215 hppa_set (buf, mono_get_lmf_addr, hppa_r1);
216 hppa_depi (buf, 0, 31, 2, hppa_r1);
217 hppa_ldw (buf, 0, hppa_r1, hppa_r1);
218 hppa_ble (buf, 0, hppa_r1);
219 hppa_copy (buf, hppa_r31, hppa_r2);
221 /* r28 now points at the (MonoLMF **) for the current thread. */
223 /* new_lmf->lmf_addr = lmf_addr */
224 hppa_stw (buf, hppa_r28, HPPA_STACK_LMF_OFFSET + G_STRUCT_OFFSET (MonoLMF, lmf_addr), hppa_r3);
226 /* new_lmf->previous_lmf = *lmf_addr */
227 hppa_ldw (buf, 0, hppa_r28, hppa_r1);
228 hppa_stw (buf, hppa_r1, HPPA_STACK_LMF_OFFSET + G_STRUCT_OFFSET (MonoLMF, previous_lmf), hppa_r3);
229 /* *lmf_addr = new_lmf */
230 hppa_ldo (buf, HPPA_STACK_LMF_OFFSET, hppa_r3, hppa_r1);
231 hppa_stw (buf, hppa_r1, 0, hppa_r28);
233 /* Call mono_magic_trampoline (gssize *regs, guint8 *code, MonoMethod *m, guint8* tramp) */
234 hppa_ldo (buf, HPPA_STACK_LMF_OFFSET + G_STRUCT_OFFSET (MonoLMF, regs), hppa_r3, hppa_r26);
235 hppa_ldw (buf, HPPA_STACK_LMF_OFFSET + G_STRUCT_OFFSET (MonoLMF, method), hppa_r3, hppa_r24);
236 if (tramp_type == MONO_TRAMPOLINE_JUMP)
237 hppa_copy (buf, hppa_r0, hppa_r25);
239 hppa_ldw (buf, -20, hppa_r3, hppa_r25);
240 /* clear the lower two (privilege) bits */
241 hppa_depi (buf, 0, 31, 2, hppa_r25);
243 hppa_copy (buf, hppa_r0, hppa_r23);
245 if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT)
246 hppa_set (buf, mono_class_init_trampoline, hppa_r1);
248 hppa_set (buf, mono_magic_trampoline, hppa_r1);
250 hppa_depi (buf, 0, 31, 2, hppa_r1);
251 hppa_ldw (buf, 0, hppa_r1, hppa_r1);
252 hppa_ble (buf, 0, hppa_r1);
253 hppa_copy (buf, hppa_r31, hppa_r2);
255 /* Code address is now in r28 */
258 hppa_ldw (buf, HPPA_STACK_LMF_OFFSET + G_STRUCT_OFFSET (MonoLMF, previous_lmf), hppa_r3, hppa_r20);
259 hppa_ldw (buf, HPPA_STACK_LMF_OFFSET + G_STRUCT_OFFSET (MonoLMF, lmf_addr), hppa_r3, hppa_r21);
260 hppa_stw (buf, hppa_r20, 0, hppa_r21);
262 hppa_copy (buf, hppa_r28, hppa_r20);
264 /* Restore arguments */
265 offset = HPPA_STACK_LMF_OFFSET + sizeof (MonoLMF);
266 for (i = hppa_r23; i <= hppa_r26; i++) {
267 hppa_ldw (buf, offset, hppa_r3, i);
268 offset += sizeof(ulong);
270 hppa_ldw (buf, offset, hppa_r3, hppa_r28);
271 offset += sizeof(ulong);
272 offset = ALIGN_TO (offset, sizeof(double));
273 hppa_ldo (buf, offset, hppa_r3, hppa_r1);
274 for (i = hppa_fr4; i <= hppa_fr7; i++) {
275 hppa_fldds (buf, 0, hppa_r1, i);
276 hppa_ldo (buf, sizeof(double), hppa_r1, hppa_r1);
279 /* Restore registers */
280 hppa_set (buf, HPPA_STACK_LMF_OFFSET + G_STRUCT_OFFSET (MonoLMF, fregs), hppa_r1);
281 for (i = 0; i < 32; i++) {
282 if (HPPA_IS_SAVED_FREG (i)) {
283 hppa_flddx (buf, hppa_r1, hppa_r3, i);
284 hppa_ldo (buf, sizeof(double), hppa_r1, hppa_r1);
288 hppa_copy (buf, hppa_r3, hppa_r1);
289 offset = HPPA_STACK_LMF_OFFSET + G_STRUCT_OFFSET (MonoLMF, regs);
290 for (i = 0; i < 32; i++) {
291 if (HPPA_IS_SAVED_GREG (i)) {
292 hppa_ldw (buf, offset, hppa_r1, i);
293 offset += sizeof(ulong);
296 /* Jump to the compiled code in hppa_r28 */
297 hppa_ldw (buf, -20, hppa_r1, hppa_r2);
298 hppa_bv (buf, hppa_r0, hppa_r20);
299 hppa_ldo (buf, -TRAMP_STACK_SIZE, hppa_sp, hppa_sp);
301 g_assert ((buf - code) <= 1024);
306 * This method is only called when running in the Mono Debugger.
309 mono_debugger_create_notification_function (void)
313 ptr = buf = mono_global_codeman_reserve (16);
315 g_assert_not_reached ();
321 * mono_arch_create_class_init_trampoline:
322 * @vtable: the type to initialize
324 * Creates a trampoline function to run a type initializer.
325 * If the trampoline is called, it calls mono_runtime_class_init with the
326 * given vtable, then patches the caller code so it does not get called any
329 * Returns: a pointer to the newly created code
332 mono_arch_create_class_init_trampoline (MonoVTable *vtable)
334 guint8 *code, *buf, *tramp;
335 tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_CLASS_INIT);
336 /* This is the method-specific part of the trampoline. Its purpose is
337 to provide the generic part with the MonoMethod *method pointer. */
338 mono_domain_lock (vtable->domain);
339 code = buf = mono_code_manager_reserve (vtable->domain->code_mp, METHOD_TRAMPOLINE_SIZE);
340 mono_domain_unlock (vtable->domain);
342 hppa_stw (buf, hppa_r2, -20, hppa_sp);
343 hppa_copy (buf, hppa_r3, hppa_r1);
344 hppa_copy (buf, hppa_sp, hppa_r3);
345 hppa_stwm (buf, hppa_r1, 64, hppa_sp);
347 /* mono_class_init_trampoline (regs, code, vtable, tramp) */
348 hppa_copy (buf, hppa_r0, hppa_r26);
349 hppa_copy (buf, hppa_r2, hppa_r25);
350 hppa_set (buf, vtable, hppa_r24);
351 hppa_copy (buf, hppa_r0, hppa_r23);
353 hppa_set (buf, mono_class_init_trampoline, hppa_r1);
354 hppa_depi (buf, 0, 31, 2, hppa_r1);
355 hppa_ldw (buf, 0, hppa_r1, hppa_r1);
356 hppa_ble (buf, 0, hppa_r1);
357 hppa_copy (buf, hppa_r31, hppa_r2);
359 hppa_ldw (buf, -20, hppa_r3, hppa_r2);
360 hppa_ldo (buf, 64, hppa_r3, hppa_sp);
361 hppa_bv (buf, hppa_r0, hppa_r2);
362 hppa_ldwm (buf, -64, hppa_sp, hppa_r3);
364 /* Flush instruction cache, since we've generated code */
365 mono_arch_flush_icache (code, buf - code);
368 g_assert ((buf - code) <= METHOD_TRAMPOLINE_SIZE);
370 mono_jit_stats.method_trampolines++;
376 create_specific_tramp (MonoMethod *method, guint8* tramp, MonoDomain *domain)
381 mono_domain_lock (domain);
382 code = buf = mono_code_manager_reserve (domain->code_mp, 20);
383 mono_domain_unlock (domain);
385 /* Call trampoline, with the "method" pointer in r20 */
386 hppa_set (buf, tramp, hppa_r1);
387 hppa_ldil (buf, hppa_lsel (method), hppa_r20);
388 hppa_bv (buf, hppa_r0, hppa_r1);
389 hppa_ldo (buf, hppa_rsel (method), hppa_r20, hppa_r20);
391 /* Flush instruction cache, since we've generated code */
392 mono_arch_flush_icache (code, buf - code);
394 g_assert ((buf - code) <= 20);
396 ji = g_new0 (MonoJitInfo, 1);
398 ji->code_start = code;
399 ji->code_size = buf - code;
401 mono_jit_stats.method_trampolines++;
408 mono_arch_create_jump_trampoline (MonoMethod *method)
411 MonoDomain* domain = mono_domain_get ();
413 tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_JUMP);
414 return create_specific_tramp (method, tramp, domain);
418 * arch_create_jit_trampoline:
419 * @method: pointer to the method info
421 * Creates a trampoline function for virtual methods. If the created
422 * code is called it first starts JIT compilation of method,
423 * and then calls the newly created method. It also replaces the
424 * corresponding vtable entry (see mono_magic_trampoline).
426 * A trampoline consists of two parts: a main fragment, shared by all method
427 * trampolines, and some code specific to each method, which hard-codes a
428 * reference to that method and then calls the main fragment.
430 * The main fragment contains a call to 'arm_magic_trampoline', which performs
431 * call to the JIT compiler and substitutes the method-specific fragment with
432 * some code that directly calls the JIT-compiled method.
434 * Returns: a pointer to the newly created code
437 mono_arch_create_jit_trampoline (MonoMethod *method)
441 MonoDomain* domain = mono_domain_get ();
444 tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_GENERIC);
445 ji = create_specific_tramp (method, tramp, domain);
446 code_start = ji->code_start;
453 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 encoded_offset)
455 /* FIXME: implement! */
456 g_assert_not_reached ();
461 mono_arch_get_rgctx_lazy_fetch_offset (gpointer *regs)
463 /* FIXME: implement! */
464 g_assert_not_reached ();