2 * tramp-x86.c: JIT trampoline code for x86
5 * Dietmar Maurer (dietmar@ximian.com)
7 * (C) 2001 Ximian, Inc.
13 #include <mono/metadata/appdomain.h>
14 #include <mono/metadata/marshal.h>
15 #include <mono/metadata/tabledefs.h>
16 #include <mono/arch/amd64/amd64-codegen.h>
17 #include <mono/metadata/mono-debug-debugger.h>
19 #ifdef HAVE_VALGRIND_MEMCHECK_H
20 #include <valgrind/memcheck.h>
24 #include "mini-amd64.h"
26 #define IS_REX(inst) (((inst) >= 0x40) && ((inst) <= 0x4f))
28 static guint8* nullified_class_init_trampoline;
31 * mono_arch_get_unbox_trampoline:
33 * @addr: pointer to native code for @m
35 * when value type methods are called through the vtable we need to unbox the
36 * this argument. This method returns a pointer to a trampoline which does
37 * unboxing before calling the method
40 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
43 int this_reg = AMD64_RDI;
44 MonoDomain *domain = mono_domain_get ();
46 if (!mono_method_signature (m)->ret->byref && MONO_TYPE_ISSTRUCT (mono_method_signature (m)->ret))
49 mono_domain_lock (domain);
50 start = code = mono_code_manager_reserve (domain->code_mp, 20);
51 mono_domain_unlock (domain);
53 amd64_alu_reg_imm (code, X86_ADD, this_reg, sizeof (MonoObject));
54 /* FIXME: Optimize this */
55 amd64_mov_reg_imm (code, AMD64_RAX, addr);
56 amd64_jump_reg (code, AMD64_RAX);
57 g_assert ((code - start) < 20);
59 mono_arch_flush_icache (start, code - start);
65 mono_arch_patch_callsite (guint8 *code, guint8 *addr)
67 if (((code [-13] == 0x49) && (code [-12] == 0xbb)) || (code [-5] == 0xe8)) {
68 if (code [-5] != 0xe8)
69 InterlockedExchangePointer ((gpointer*)(code - 11), addr);
71 g_assert ((((guint64)(addr)) >> 32) == 0);
72 g_assert ((((guint64)(code)) >> 32) == 0);
73 InterlockedExchange ((guint32*)(code - 4), ((gint64)addr - (gint64)code));
76 else if ((code [-7] == 0x41) && (code [-6] == 0xff) && (code [-5] == 0x15)) {
77 /* call *<OFFSET>(%rip) */
78 gpointer *got_entry = (gpointer*)((guint8*)code + (*(guint32*)(code - 4)));
79 InterlockedExchangePointer (got_entry, addr);
84 mono_arch_nullify_class_init_trampoline (guint8 *code, gssize *regs)
89 * A given byte sequence can match more than case here, so we have to be
90 * really careful about the ordering of the cases. Longer sequences
93 if ((code [-4] == 0x41) && (code [-3] == 0xff) && (code [-2] == 0x15)) {
94 gpointer *vtable_slot;
96 /* call *<OFFSET>(%rip) */
97 vtable_slot = mono_arch_get_vcall_slot_addr (code + 3, (gpointer*)regs);
98 g_assert (vtable_slot);
100 *vtable_slot = nullified_class_init_trampoline;
101 } else if (code [-2] == 0xe8) {
103 guint8 *buf = code - 2;
110 } else if ((code [0] == 0x49) && (code [1] == 0xff)) {
112 /* amd64_set_reg_template is 10 bytes long */
113 guint8* buf = code - 10;
115 /* FIXME: Make this thread safe */
116 /* Padding code suggested by the AMD64 Opt Manual */
130 } else if (code [0] == 0x90 || code [0] == 0xeb || code [0] == 0x66) {
131 /* Already changed by another thread */
134 printf ("Invalid trampoline sequence: %x %x %x %x %x %x %x\n", code [0], code [1], code [2], code [3],
135 code [4], code [5], code [6]);
136 g_assert_not_reached ();
141 mono_arch_patch_delegate_trampoline (guint8 *code, guint8 *tramp, gssize *regs, guint8 *addr)
147 if ((code [-3] == 0xff) && (amd64_modrm_reg (code [-2]) == 0x2) && (amd64_modrm_mod (code [-2]) == 0x1)) {
148 /* call *[reg+disp8] */
149 if (IS_REX (code [-4]))
151 reg = amd64_modrm_rm (code [-2]);
152 disp = *(guint8*)(code - 1);
153 //printf ("B: [%%r%d+0x%x]\n", reg, disp);
158 for (i = -16; i < 0; ++i)
159 printf ("%d ", code [i]);
161 g_assert_not_reached ();
164 reg += amd64_rex_b (rex);
166 /* R11 is clobbered by the trampoline code */
167 g_assert (reg != AMD64_R11);
169 *(gpointer*)(((guint64)(regs [reg])) + disp) = addr;
173 mono_arch_create_trampoline_code (MonoTrampolineType tramp_type)
175 guint8 *buf, *code, *tramp;
176 int i, lmf_offset, offset, method_offset, tramp_offset, saved_regs_offset, saved_fpregs_offset, framesize;
179 if (tramp_type == MONO_TRAMPOLINE_JUMP)
184 code = buf = mono_global_codeman_reserve (512);
186 framesize = 512 + sizeof (MonoLMF);
187 framesize = (framesize + (MONO_ARCH_FRAME_ALIGNMENT - 1)) & ~ (MONO_ARCH_FRAME_ALIGNMENT - 1);
192 * Allocate a new stack frame and transfer the two arguments received on
193 * the stack to our frame.
195 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
196 amd64_pop_reg (code, AMD64_R11);
198 amd64_push_reg (code, AMD64_RBP);
199 amd64_mov_reg_reg (code, AMD64_RBP, AMD64_RSP, 8);
200 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, framesize);
203 * The method is at offset -8 from the new RBP, so no need to
207 method_offset = - offset;
210 tramp_offset = - offset;
211 amd64_mov_membase_reg (code, AMD64_RBP, tramp_offset, AMD64_R11, 8);
213 /* Save all registers */
215 offset += AMD64_NREG * 8;
216 saved_regs_offset = - offset;
217 for (i = 0; i < AMD64_NREG; ++i)
218 amd64_mov_membase_reg (code, AMD64_RBP, saved_regs_offset + (i * 8), i, 8);
220 saved_fpregs_offset = - offset;
221 for (i = 0; i < 8; ++i)
222 amd64_movsd_membase_reg (code, AMD64_RBP, saved_fpregs_offset + (i * 8), i);
226 offset += sizeof (MonoLMF);
227 lmf_offset = - offset;
231 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RBP, 8, 8);
233 amd64_mov_reg_imm (code, AMD64_R11, 0);
234 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, rip), AMD64_R11, 8);
236 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RSP, framesize, 8);
237 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, ebp), AMD64_R11, 8);
239 amd64_mov_reg_reg (code, AMD64_R11, AMD64_RSP, 8);
240 amd64_alu_reg_imm (code, X86_ADD, AMD64_R11, framesize + 16);
241 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, rsp), AMD64_R11, 8);
243 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RBP, method_offset, 8);
244 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, method), AMD64_R11, 8);
245 /* Save callee saved regs */
246 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, rbx), AMD64_RBX, 8);
247 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, r12), AMD64_R12, 8);
248 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, r13), AMD64_R13, 8);
249 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, r14), AMD64_R14, 8);
250 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, r15), AMD64_R15, 8);
252 amd64_mov_reg_imm (code, AMD64_R11, mono_get_lmf_addr);
253 amd64_call_reg (code, AMD64_R11);
256 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, lmf_addr), AMD64_RAX, 8);
257 /* Save previous_lmf */
258 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RAX, 0, 8);
259 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, previous_lmf), AMD64_R11, 8);
261 amd64_lea_membase (code, AMD64_R11, AMD64_RBP, lmf_offset);
262 amd64_mov_membase_reg (code, AMD64_RAX, 0, AMD64_R11, 8);
266 /* Arg1 is the pointer to the saved registers */
267 amd64_lea_membase (code, AMD64_RDI, AMD64_RBP, saved_regs_offset);
269 /* Arg2 is the address of the calling code */
271 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_RBP, 8, 8);
273 amd64_mov_reg_imm (code, AMD64_RSI, 0);
275 /* Arg3 is the method/vtable ptr */
276 amd64_mov_reg_membase (code, AMD64_RDX, AMD64_RBP, method_offset, 8);
278 /* Arg4 is the trampoline address */
279 amd64_mov_reg_membase (code, AMD64_RCX, AMD64_RBP, tramp_offset, 8);
281 if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT)
282 tramp = (guint8*)mono_class_init_trampoline;
283 else if (tramp_type == MONO_TRAMPOLINE_AOT)
284 tramp = (guint8*)mono_aot_trampoline;
285 else if (tramp_type == MONO_TRAMPOLINE_DELEGATE)
286 tramp = (guint8*)mono_delegate_trampoline;
288 tramp = (guint8*)mono_magic_trampoline;
290 amd64_mov_reg_imm (code, AMD64_RAX, tramp);
291 amd64_call_reg (code, AMD64_RAX);
295 amd64_mov_reg_membase (code, AMD64_RCX, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, previous_lmf), 8);
296 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, lmf_addr), 8);
297 amd64_mov_membase_reg (code, AMD64_R11, 0, AMD64_RCX, 8);
299 /* Restore argument registers */
300 for (i = 0; i < AMD64_NREG; ++i)
301 if (AMD64_IS_ARGUMENT_REG (i))
302 amd64_mov_reg_membase (code, i, AMD64_RBP, saved_regs_offset + (i * 8), 8);
304 for (i = 0; i < 8; ++i)
305 amd64_movsd_reg_membase (code, i, AMD64_RBP, saved_fpregs_offset + (i * 8));
310 if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT)
313 /* call the compiled method */
314 amd64_jump_reg (code, X86_EAX);
316 g_assert ((code - buf) <= 512);
318 mono_arch_flush_icache (buf, code - buf);
320 if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT) {
321 /* Initialize the nullified class init trampoline used in the AOT case */
322 nullified_class_init_trampoline = code = mono_global_codeman_reserve (16);
329 #define TRAMPOLINE_SIZE 34
332 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
334 guint8 *code, *buf, *tramp, *real_code;
335 int size, jump_offset;
337 tramp = mono_get_trampoline_code (tramp_type);
339 code = buf = g_alloca (TRAMPOLINE_SIZE);
341 /* push trampoline address */
342 amd64_lea_membase (code, AMD64_R11, AMD64_RIP, -7);
343 amd64_push_reg (code, AMD64_R11);
346 if (amd64_is_imm32 ((gint64)arg1))
347 amd64_push_imm (code, (gint64)arg1);
349 amd64_mov_reg_imm (code, AMD64_R11, arg1);
350 amd64_push_reg (code, AMD64_R11);
353 jump_offset = code - buf;
354 amd64_jump_disp (code, 0xffffffff);
356 g_assert ((code - buf) <= TRAMPOLINE_SIZE);
358 mono_domain_lock (domain);
360 * FIXME: Changing the size to code - buf causes strange crashes during
363 real_code = mono_code_manager_reserve (domain->code_mp, TRAMPOLINE_SIZE);
365 mono_domain_unlock (domain);
367 memcpy (real_code, buf, size);
370 g_assert ((((gint64)tramp) >> 32) == 0);
371 code = (guint8*)real_code + jump_offset;
372 amd64_jump_disp (code, tramp - code);
374 mono_jit_stats.method_trampolines++;
379 mono_arch_flush_icache (real_code, size);
385 mono_arch_invalidate_method (MonoJitInfo *ji, void *func, gpointer func_arg)
387 /* FIXME: This is not thread safe */
388 guint8 *code = ji->code_start;
390 amd64_mov_reg_imm (code, AMD64_RDI, func_arg);
391 amd64_mov_reg_imm (code, AMD64_R11, func);
393 x86_push_imm (code, (guint64)func_arg);
394 amd64_call_reg (code, AMD64_R11);
398 * This method is only called when running in the Mono Debugger.
401 mono_debugger_create_notification_function (gpointer *notification_address)
405 ptr = buf = mono_global_codeman_reserve (16);
407 x86_breakpoint (buf);
408 if (notification_address)
409 *notification_address = buf;