3 * JIT trampoline code for MIPS
6 * Mark Mason (mason@broadcom.com)
8 * Based on tramp-ppc.c by:
9 * Dietmar Maurer (dietmar@ximian.com)
10 * Paolo Molaro (lupus@ximian.com)
11 * Carlos Valiente <yo@virutass.net>
14 * (C) 2001 Ximian, Inc.
20 #include <mono/metadata/abi-details.h>
21 #include <mono/metadata/appdomain.h>
22 #include <mono/metadata/marshal.h>
23 #include <mono/metadata/tabledefs.h>
24 #include <mono/arch/mips/mips-codegen.h>
27 #include "mini-mips.h"
30 * get_unbox_trampoline:
32 * @addr: pointer to native code for @m
34 * when value type methods are called through the vtable we need to unbox the
35 * this argument. This method returns a pointer to a trampoline which does
36 * unboxing before calling the method
39 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
42 MonoDomain *domain = mono_domain_get ();
44 start = code = mono_domain_code_reserve (domain, 20);
46 mips_load (code, mips_t9, addr);
47 /* The this pointer is kept in a0 */
48 mips_addiu (code, mips_a0, mips_a0, sizeof (MonoObject));
49 mips_jr (code, mips_t9);
52 mono_arch_flush_icache (start, code - start);
53 g_assert ((code - start) <= 20);
54 /*g_print ("unbox trampoline at %d for %s:%s\n", this_pos, m->klass->name, m->name);
55 g_print ("unbox code is at %p for method at %p\n", start, addr);*/
57 mono_tramp_info_register (mono_tramp_info_create (NULL, start, code - start, NULL, NULL), domain);
63 mono_arch_patch_callsite (guint8 *method_start, guint8 *orig_code, guint8 *addr)
65 guint32 *code = (guint32*)orig_code;
67 /* Locate the address of the method-specific trampoline.
68 The call using the vtable slot that took the processing flow to
69 'arch_create_jit_trampoline' looks something like one of these:
79 On entry, 'code' points just after one of the above sequences.
83 if ((code[-2] >> 26) == 0x03) {
84 //g_print ("direct patching\n");
85 mips_patch ((code-2), (gsize)addr);
88 /* Look for the jalr */
89 if ((code[-2] & 0xfc1f003f) == 0x00000009) {
90 /* The lui / addiu / jalr case */
91 if ((code [-4] >> 26) == 0x0f && (code [-3] >> 26) == 0x09
92 && (code [-2] >> 26) == 0) {
93 mips_patch ((code-4), (gsize)addr);
97 g_print("error: bad patch at 0x%08x\n", code);
98 g_assert_not_reached ();
102 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
104 g_assert_not_reached ();
107 /* Stack size for trampoline function
108 * MIPS_MINIMAL_STACK_SIZE + 16 (args + alignment to mips_magic_trampoline)
109 * + MonoLMF + 14 fp regs + 13 gregs + alignment
110 * #define STACK (MIPS_MINIMAL_STACK_SIZE + 4 * sizeof (gulong) + sizeof (MonoLMF) + 14 * sizeof (double) + 13 * (sizeof (gulong)))
111 * STACK would be 444 for 32 bit darwin
114 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
116 #define STACK (int)(ALIGN_TO(4*IREG_SIZE + 8 + sizeof(MonoLMF) + 32, 8))
119 * Stack frame description when the generic trampoline is called.
121 * --------------------
123 * -------------------
124 * Saved FP registers 0-13
125 * -------------------
126 * Saved general registers 0-12
127 * -------------------
128 * param area for 3 args to mips_magic_trampoline
129 * -------------------
131 * -------------------
134 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
137 guint8 *buf, *tramp, *code = NULL;
139 GSList *unwind_ops = NULL;
140 MonoJumpInfo *ji = NULL;
141 int max_code_len = 768;
143 /* AOT not supported on MIPS yet */
146 /* Now we'll create in 'buf' the MIPS trampoline code. This
147 is the trampoline code common to all methods */
149 code = buf = mono_global_codeman_reserve (max_code_len);
151 /* Allocate the stack frame, and save the return address */
152 mips_addiu (code, mips_sp, mips_sp, -STACK);
153 mips_sw (code, mips_ra, mips_sp, STACK + MIPS_RET_ADDR_OFFSET);
155 /* we build the MonoLMF structure on the stack - see mini-mips.h */
156 /* offset of MonoLMF from sp */
157 lmf = STACK - sizeof (MonoLMF) - 8;
159 for (i = 0; i < MONO_MAX_IREGS; i++)
160 MIPS_SW (code, i, mips_sp, lmf + G_STRUCT_OFFSET (MonoLMF, iregs[i]));
161 for (i = 0; i < MONO_MAX_FREGS; i++)
162 MIPS_SWC1 (code, i, mips_sp, lmf + G_STRUCT_OFFSET (MonoLMF, fregs[i]));
164 /* Set the magic number */
165 mips_load_const (code, mips_at, MIPS_LMF_MAGIC2);
166 mips_sw (code, mips_at, mips_sp, lmf + G_STRUCT_OFFSET(MonoLMF, magic));
169 mips_addiu (code, mips_at, mips_sp, STACK);
170 MIPS_SW (code, mips_at, mips_sp, lmf + G_STRUCT_OFFSET (MonoLMF, iregs[mips_sp]));
172 /* save method info (it was in t8) */
173 mips_sw (code, mips_t8, mips_sp, lmf + G_STRUCT_OFFSET(MonoLMF, method));
175 /* save the IP (caller ip) */
176 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
177 mips_sw (code, mips_zero, mips_sp, lmf + G_STRUCT_OFFSET(MonoLMF, eip));
179 mips_sw (code, mips_ra, mips_sp, lmf + G_STRUCT_OFFSET(MonoLMF, eip));
182 /* jump to mono_get_lmf_addr here */
183 mips_load (code, mips_t9, mono_get_lmf_addr);
184 mips_jalr (code, mips_t9, mips_ra);
187 /* v0 now points at the (MonoLMF **) for the current thread */
189 /* new_lmf->lmf_addr = lmf_addr -- useful when unwinding */
190 mips_sw (code, mips_v0, mips_sp, lmf + G_STRUCT_OFFSET(MonoLMF, lmf_addr));
192 /* new_lmf->previous_lmf = *lmf_addr */
193 mips_lw (code, mips_at, mips_v0, 0);
194 mips_sw (code, mips_at, mips_sp, lmf + G_STRUCT_OFFSET(MonoLMF, previous_lmf));
196 /* *(lmf_addr) = new_lmf */
197 mips_addiu (code, mips_at, mips_sp, lmf);
198 mips_sw (code, mips_at, mips_v0, 0);
201 * Now we're ready to call mips_magic_trampoline ().
204 /* Arg 1: pointer to registers so that the magic trampoline can
205 * access what we saved above
207 mips_addiu (code, mips_a0, mips_sp, lmf + G_STRUCT_OFFSET (MonoLMF, iregs[0]));
209 /* Arg 2: code (next address to the instruction that called us) */
210 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
211 mips_move (code, mips_a1, mips_zero);
213 mips_lw (code, mips_a1, mips_sp, STACK + MIPS_RET_ADDR_OFFSET);
216 /* Arg 3: MonoMethod *method. */
217 mips_lw (code, mips_a2, mips_sp, lmf + G_STRUCT_OFFSET (MonoLMF, method));
219 /* Arg 4: Trampoline */
220 mips_move (code, mips_a3, mips_zero);
222 /* Now go to the trampoline */
223 tramp = (guint8*)mono_get_trampoline_func (tramp_type);
224 mips_load (code, mips_t9, (guint32)tramp);
225 mips_jalr (code, mips_t9, mips_ra);
228 /* Code address is now in v0, move it to at */
229 mips_move (code, mips_at, mips_v0);
232 * Now unwind the MonoLMF
235 /* t0 = current_lmf->previous_lmf */
236 mips_lw (code, mips_t0, mips_sp, lmf + G_STRUCT_OFFSET(MonoLMF, previous_lmf));
238 mips_lw (code, mips_t1, mips_sp, lmf + G_STRUCT_OFFSET(MonoLMF, lmf_addr));
239 /* (*lmf_addr) = previous_lmf */
240 mips_sw (code, mips_t0, mips_t1, 0);
242 /* Restore the callee-saved & argument registers */
243 for (i = 0; i < MONO_MAX_IREGS; i++) {
244 if ((MONO_ARCH_CALLEE_SAVED_REGS | MONO_ARCH_CALLEE_REGS | MIPS_ARG_REGS) & (1 << i))
245 MIPS_LW (code, i, mips_sp, lmf + G_STRUCT_OFFSET (MonoLMF, iregs[i]));
247 for (i = 0; i < MONO_MAX_FREGS; i++)
248 MIPS_LWC1 (code, i, mips_sp, lmf + G_STRUCT_OFFSET (MonoLMF, fregs[i]));
250 /* Non-standard function epilogue. Instead of doing a proper
251 * return, we just jump to the compiled code.
253 /* Restore ra & stack pointer, and jump to the code */
255 if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
256 mips_move (code, mips_v0, mips_at);
257 mips_lw (code, mips_ra, mips_sp, STACK + MIPS_RET_ADDR_OFFSET);
258 mips_addiu (code, mips_sp, mips_sp, STACK);
259 if (MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type))
260 mips_jr (code, mips_ra);
262 mips_jr (code, mips_at);
265 /* Flush instruction cache, since we've generated code */
266 mono_arch_flush_icache (buf, code - buf);
269 g_assert ((code - buf) <= max_code_len);
272 tramp_name = mono_get_generic_trampoline_name (tramp_type);
273 *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
280 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
282 guint8 *code, *buf, *tramp;
284 tramp = mono_get_trampoline_code (tramp_type);
286 code = buf = mono_domain_code_reserve (domain, 32);
288 /* Prepare the jump to the generic trampoline code
289 * mono_arch_create_trampoline_code() knows we're putting this in t8
291 mips_load (code, mips_t8, arg1);
293 /* Now jump to the generic trampoline code */
294 mips_load (code, mips_at, tramp);
295 mips_jr (code, mips_at);
298 /* Flush instruction cache, since we've generated code */
299 mono_arch_flush_icache (buf, code - buf);
301 g_assert ((code - buf) <= 32);
304 *code_len = code - buf;
310 mono_arch_get_static_rgctx_trampoline (gpointer arg, gpointer addr)
312 guint8 *code, *start;
315 MonoDomain *domain = mono_domain_get ();
319 start = code = mono_domain_code_reserve (domain, buf_len);
321 mips_load (code, MONO_ARCH_RGCTX_REG, arg);
322 mips_load (code, mips_at, addr);
323 mips_jr (code, mips_at);
326 g_assert ((code - start) <= buf_len);
328 mono_arch_flush_icache (start, code - start);
330 mono_tramp_info_register (mono_tramp_info_create (NULL, start, code - start, NULL, NULL), domain);
336 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
342 guint8 **rgctx_null_jumps;
346 MonoJumpInfo *ji = NULL;
347 GSList *unwind_ops = NULL;
349 mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
350 index = MONO_RGCTX_SLOT_INDEX (slot);
352 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (gpointer);
353 for (depth = 0; ; ++depth) {
354 int size = mono_class_rgctx_get_array_size (depth, mrgctx);
356 if (index < size - 1)
361 tramp_size = 64 + 16 * depth;
363 code = buf = mono_global_codeman_reserve (tramp_size);
365 mono_add_unwind_op_def_cfa (unwind_ops, code, buf, mips_sp, 0);
367 rgctx_null_jumps = g_malloc (sizeof (guint8*) * (depth + 2));
370 /* The vtable/mrgctx is in a0 */
371 g_assert (MONO_ARCH_VTABLE_REG == mips_a0);
374 mips_move (code, mips_a1, mips_a0);
376 /* load rgctx ptr from vtable */
377 g_assert (mips_is_imm16 (MONO_STRUCT_OFFSET (MonoVTable, runtime_generic_context)));
378 mips_lw (code, mips_a1, mips_a0, MONO_STRUCT_OFFSET (MonoVTable, runtime_generic_context));
379 /* is the rgctx ptr null? */
380 /* if yes, jump to actual trampoline */
381 rgctx_null_jumps [njumps ++] = code;
382 mips_beq (code, mips_a1, mips_zero, 0);
386 for (i = 0; i < depth; ++i) {
387 /* load ptr to next array */
388 if (mrgctx && i == 0) {
389 g_assert (mips_is_imm16 (MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT));
390 mips_lw (code, mips_a1, mips_a1, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT);
392 mips_lw (code, mips_a1, mips_a1, 0);
394 /* is the ptr null? */
395 /* if yes, jump to actual trampoline */
396 rgctx_null_jumps [njumps ++] = code;
397 mips_beq (code, mips_a1, mips_zero, 0);
402 g_assert (mips_is_imm16 (sizeof (gpointer) * (index + 1)));
403 mips_lw (code, mips_a1, mips_a1, sizeof (gpointer) * (index + 1));
404 /* is the slot null? */
405 /* if yes, jump to actual trampoline */
406 rgctx_null_jumps [njumps ++] = code;
407 mips_beq (code, mips_a1, mips_zero, 0);
409 /* otherwise return, result is in R1 */
410 mips_move (code, mips_v0, mips_a1);
411 mips_jr (code, mips_ra);
414 g_assert (njumps <= depth + 2);
415 for (i = 0; i < njumps; ++i)
416 mips_patch ((guint32*)rgctx_null_jumps [i], (guint32)code);
418 g_free (rgctx_null_jumps);
422 /* The vtable/mrgctx is still in a0 */
425 ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("specific_trampoline_lazy_fetch_%u", slot));
426 mips_load (code, mips_at, 0);
427 mips_jr (code, mips_at);
430 tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), &code_len);
431 mips_load (code, mips_at, tramp);
432 mips_jr (code, mips_at);
436 mono_arch_flush_icache (buf, code - buf);
438 g_assert (code - buf <= tramp_size);
441 char *name = mono_get_rgctx_fetch_trampoline_name (slot);
442 *info = mono_tramp_info_create (name, buf, code - buf, ji, unwind_ops);