2 * tramp-mips.c: JIT trampoline code for MIPS
5 * Mark Mason (mason@broadcom.com)
7 * Based on tramp-ppc.c by:
8 * Dietmar Maurer (dietmar@ximian.com)
9 * Paolo Molaro (lupus@ximian.com)
10 * Carlos Valiente <yo@virutass.net>
13 * (C) 2001 Ximian, Inc.
19 #include <mono/metadata/abi-details.h>
20 #include <mono/metadata/appdomain.h>
21 #include <mono/metadata/marshal.h>
22 #include <mono/metadata/tabledefs.h>
23 #include <mono/arch/mips/mips-codegen.h>
26 #include "mini-mips.h"
29 * get_unbox_trampoline:
31 * @addr: pointer to native code for @m
33 * when value type methods are called through the vtable we need to unbox the
34 * this argument. This method returns a pointer to a trampoline which does
35 * unboxing before calling the method
38 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
41 MonoDomain *domain = mono_domain_get ();
43 start = code = mono_domain_code_reserve (domain, 20);
45 mips_load (code, mips_t9, addr);
46 /* The this pointer is kept in a0 */
47 mips_addiu (code, mips_a0, mips_a0, sizeof (MonoObject));
48 mips_jr (code, mips_t9);
51 mono_arch_flush_icache (start, code - start);
52 g_assert ((code - start) <= 20);
53 /*g_print ("unbox trampoline at %d for %s:%s\n", this_pos, m->klass->name, m->name);
54 g_print ("unbox code is at %p for method at %p\n", start, addr);*/
56 mono_tramp_info_register (mono_tramp_info_create (NULL, start, code - start, NULL, NULL), domain);
62 mono_arch_patch_callsite (guint8 *method_start, guint8 *orig_code, guint8 *addr)
64 guint32 *code = (guint32*)orig_code;
66 /* Locate the address of the method-specific trampoline.
67 The call using the vtable slot that took the processing flow to
68 'arch_create_jit_trampoline' looks something like one of these:
78 On entry, 'code' points just after one of the above sequences.
82 if ((code[-2] >> 26) == 0x03) {
83 //g_print ("direct patching\n");
84 mips_patch ((code-2), (gsize)addr);
87 /* Look for the jalr */
88 if ((code[-2] & 0xfc1f003f) == 0x00000009) {
89 /* The lui / addiu / jalr case */
90 if ((code [-4] >> 26) == 0x0f && (code [-3] >> 26) == 0x09
91 && (code [-2] >> 26) == 0) {
92 mips_patch ((code-4), (gsize)addr);
96 g_print("error: bad patch at 0x%08x\n", code);
97 g_assert_not_reached ();
101 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
103 g_assert_not_reached ();
106 /* Stack size for trampoline function
107 * MIPS_MINIMAL_STACK_SIZE + 16 (args + alignment to mips_magic_trampoline)
108 * + MonoLMF + 14 fp regs + 13 gregs + alignment
109 * #define STACK (MIPS_MINIMAL_STACK_SIZE + 4 * sizeof (gulong) + sizeof (MonoLMF) + 14 * sizeof (double) + 13 * (sizeof (gulong)))
110 * STACK would be 444 for 32 bit darwin
113 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
115 #define STACK (int)(ALIGN_TO(4*IREG_SIZE + 8 + sizeof(MonoLMF) + 32, 8))
118 * Stack frame description when the generic trampoline is called.
120 * --------------------
122 * -------------------
123 * Saved FP registers 0-13
124 * -------------------
125 * Saved general registers 0-12
126 * -------------------
127 * param area for 3 args to mips_magic_trampoline
128 * -------------------
130 * -------------------
133 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
136 guint8 *buf, *tramp, *code = NULL;
138 GSList *unwind_ops = NULL;
139 MonoJumpInfo *ji = NULL;
140 int max_code_len = 768;
142 /* AOT not supported on MIPS yet */
145 /* Now we'll create in 'buf' the MIPS trampoline code. This
146 is the trampoline code common to all methods */
148 code = buf = mono_global_codeman_reserve (max_code_len);
150 /* Allocate the stack frame, and save the return address */
151 mips_addiu (code, mips_sp, mips_sp, -STACK);
152 mips_sw (code, mips_ra, mips_sp, STACK + MIPS_RET_ADDR_OFFSET);
154 /* we build the MonoLMF structure on the stack - see mini-mips.h */
155 /* offset of MonoLMF from sp */
156 lmf = STACK - sizeof (MonoLMF) - 8;
158 for (i = 0; i < MONO_MAX_IREGS; i++)
159 MIPS_SW (code, i, mips_sp, lmf + G_STRUCT_OFFSET (MonoLMF, iregs[i]));
160 for (i = 0; i < MONO_MAX_FREGS; i++)
161 MIPS_SWC1 (code, i, mips_sp, lmf + G_STRUCT_OFFSET (MonoLMF, fregs[i]));
163 /* Set the magic number */
164 mips_load_const (code, mips_at, MIPS_LMF_MAGIC2);
165 mips_sw (code, mips_at, mips_sp, lmf + G_STRUCT_OFFSET(MonoLMF, magic));
168 mips_addiu (code, mips_at, mips_sp, STACK);
169 MIPS_SW (code, mips_at, mips_sp, lmf + G_STRUCT_OFFSET (MonoLMF, iregs[mips_sp]));
171 /* save method info (it was in t8) */
172 mips_sw (code, mips_t8, mips_sp, lmf + G_STRUCT_OFFSET(MonoLMF, method));
174 /* save the IP (caller ip) */
175 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
176 mips_sw (code, mips_zero, mips_sp, lmf + G_STRUCT_OFFSET(MonoLMF, eip));
178 mips_sw (code, mips_ra, mips_sp, lmf + G_STRUCT_OFFSET(MonoLMF, eip));
181 /* jump to mono_get_lmf_addr here */
182 mips_load (code, mips_t9, mono_get_lmf_addr);
183 mips_jalr (code, mips_t9, mips_ra);
186 /* v0 now points at the (MonoLMF **) for the current thread */
188 /* new_lmf->lmf_addr = lmf_addr -- useful when unwinding */
189 mips_sw (code, mips_v0, mips_sp, lmf + G_STRUCT_OFFSET(MonoLMF, lmf_addr));
191 /* new_lmf->previous_lmf = *lmf_addr */
192 mips_lw (code, mips_at, mips_v0, 0);
193 mips_sw (code, mips_at, mips_sp, lmf + G_STRUCT_OFFSET(MonoLMF, previous_lmf));
195 /* *(lmf_addr) = new_lmf */
196 mips_addiu (code, mips_at, mips_sp, lmf);
197 mips_sw (code, mips_at, mips_v0, 0);
200 * Now we're ready to call mips_magic_trampoline ().
203 /* Arg 1: pointer to registers so that the magic trampoline can
204 * access what we saved above
206 mips_addiu (code, mips_a0, mips_sp, lmf + G_STRUCT_OFFSET (MonoLMF, iregs[0]));
208 /* Arg 2: code (next address to the instruction that called us) */
209 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
210 mips_move (code, mips_a1, mips_zero);
212 mips_lw (code, mips_a1, mips_sp, STACK + MIPS_RET_ADDR_OFFSET);
215 /* Arg 3: MonoMethod *method. */
216 mips_lw (code, mips_a2, mips_sp, lmf + G_STRUCT_OFFSET (MonoLMF, method));
218 /* Arg 4: Trampoline */
219 mips_move (code, mips_a3, mips_zero);
221 /* Now go to the trampoline */
222 tramp = (guint8*)mono_get_trampoline_func (tramp_type);
223 mips_load (code, mips_t9, (guint32)tramp);
224 mips_jalr (code, mips_t9, mips_ra);
227 /* Code address is now in v0, move it to at */
228 mips_move (code, mips_at, mips_v0);
231 * Now unwind the MonoLMF
234 /* t0 = current_lmf->previous_lmf */
235 mips_lw (code, mips_t0, mips_sp, lmf + G_STRUCT_OFFSET(MonoLMF, previous_lmf));
237 mips_lw (code, mips_t1, mips_sp, lmf + G_STRUCT_OFFSET(MonoLMF, lmf_addr));
238 /* (*lmf_addr) = previous_lmf */
239 mips_sw (code, mips_t0, mips_t1, 0);
241 /* Restore the callee-saved & argument registers */
242 for (i = 0; i < MONO_MAX_IREGS; i++) {
243 if ((MONO_ARCH_CALLEE_SAVED_REGS | MONO_ARCH_CALLEE_REGS | MIPS_ARG_REGS) & (1 << i))
244 MIPS_LW (code, i, mips_sp, lmf + G_STRUCT_OFFSET (MonoLMF, iregs[i]));
246 for (i = 0; i < MONO_MAX_FREGS; i++)
247 MIPS_LWC1 (code, i, mips_sp, lmf + G_STRUCT_OFFSET (MonoLMF, fregs[i]));
249 /* Non-standard function epilogue. Instead of doing a proper
250 * return, we just jump to the compiled code.
252 /* Restore ra & stack pointer, and jump to the code */
254 if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
255 mips_move (code, mips_v0, mips_at);
256 mips_lw (code, mips_ra, mips_sp, STACK + MIPS_RET_ADDR_OFFSET);
257 mips_addiu (code, mips_sp, mips_sp, STACK);
258 if (MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type))
259 mips_jr (code, mips_ra);
261 mips_jr (code, mips_at);
264 /* Flush instruction cache, since we've generated code */
265 mono_arch_flush_icache (buf, code - buf);
268 g_assert ((code - buf) <= max_code_len);
271 tramp_name = mono_get_generic_trampoline_name (tramp_type);
272 *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
279 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
281 guint8 *code, *buf, *tramp;
283 tramp = mono_get_trampoline_code (tramp_type);
285 code = buf = mono_domain_code_reserve (domain, 32);
287 /* Prepare the jump to the generic trampoline code
288 * mono_arch_create_trampoline_code() knows we're putting this in t8
290 mips_load (code, mips_t8, arg1);
292 /* Now jump to the generic trampoline code */
293 mips_load (code, mips_at, tramp);
294 mips_jr (code, mips_at);
297 /* Flush instruction cache, since we've generated code */
298 mono_arch_flush_icache (buf, code - buf);
300 g_assert ((code - buf) <= 32);
303 *code_len = code - buf;
309 mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
311 guint8 *code, *start;
314 MonoDomain *domain = mono_domain_get ();
318 start = code = mono_domain_code_reserve (domain, buf_len);
320 mips_load (code, MONO_ARCH_RGCTX_REG, mrgctx);
321 mips_load (code, mips_at, addr);
322 mips_jr (code, mips_at);
325 g_assert ((code - start) <= buf_len);
327 mono_arch_flush_icache (start, code - start);
329 mono_tramp_info_register (mono_tramp_info_create (NULL, start, code - start, NULL, NULL), domain);
335 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
341 guint8 **rgctx_null_jumps;
345 MonoJumpInfo *ji = NULL;
346 GSList *unwind_ops = NULL;
348 mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
349 index = MONO_RGCTX_SLOT_INDEX (slot);
351 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (gpointer);
352 for (depth = 0; ; ++depth) {
353 int size = mono_class_rgctx_get_array_size (depth, mrgctx);
355 if (index < size - 1)
360 tramp_size = 64 + 16 * depth;
362 code = buf = mono_global_codeman_reserve (tramp_size);
364 mono_add_unwind_op_def_cfa (unwind_ops, code, buf, mips_sp, 0);
366 rgctx_null_jumps = g_malloc (sizeof (guint8*) * (depth + 2));
369 /* The vtable/mrgctx is in a0 */
370 g_assert (MONO_ARCH_VTABLE_REG == mips_a0);
373 mips_move (code, mips_a1, mips_a0);
375 /* load rgctx ptr from vtable */
376 g_assert (mips_is_imm16 (MONO_STRUCT_OFFSET (MonoVTable, runtime_generic_context)));
377 mips_lw (code, mips_a1, mips_a0, MONO_STRUCT_OFFSET (MonoVTable, runtime_generic_context));
378 /* is the rgctx ptr null? */
379 /* if yes, jump to actual trampoline */
380 rgctx_null_jumps [njumps ++] = code;
381 mips_beq (code, mips_a1, mips_zero, 0);
385 for (i = 0; i < depth; ++i) {
386 /* load ptr to next array */
387 if (mrgctx && i == 0) {
388 g_assert (mips_is_imm16 (MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT));
389 mips_lw (code, mips_a1, mips_a1, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT);
391 mips_lw (code, mips_a1, mips_a1, 0);
393 /* is the ptr null? */
394 /* if yes, jump to actual trampoline */
395 rgctx_null_jumps [njumps ++] = code;
396 mips_beq (code, mips_a1, mips_zero, 0);
401 g_assert (mips_is_imm16 (sizeof (gpointer) * (index + 1)));
402 mips_lw (code, mips_a1, mips_a1, sizeof (gpointer) * (index + 1));
403 /* is the slot null? */
404 /* if yes, jump to actual trampoline */
405 rgctx_null_jumps [njumps ++] = code;
406 mips_beq (code, mips_a1, mips_zero, 0);
408 /* otherwise return, result is in R1 */
409 mips_move (code, mips_v0, mips_a1);
410 mips_jr (code, mips_ra);
413 g_assert (njumps <= depth + 2);
414 for (i = 0; i < njumps; ++i)
415 mips_patch ((guint32*)rgctx_null_jumps [i], (guint32)code);
417 g_free (rgctx_null_jumps);
421 /* The vtable/mrgctx is still in a0 */
424 ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("specific_trampoline_lazy_fetch_%u", slot));
425 mips_load (code, mips_at, 0);
426 mips_jr (code, mips_at);
429 tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), &code_len);
430 mips_load (code, mips_at, tramp);
431 mips_jr (code, mips_at);
435 mono_arch_flush_icache (buf, code - buf);
437 g_assert (code - buf <= tramp_size);
440 char *name = mono_get_rgctx_fetch_trampoline_name (slot);
441 *info = mono_tramp_info_create (name, buf, code - buf, ji, unwind_ops);