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>
18 #ifdef HAVE_VALGRIND_MEMCHECK_H
19 #include <valgrind/memcheck.h>
23 #include "mini-amd64.h"
25 #define IS_REX(inst) (((inst) >= 0x40) && ((inst) <= 0x4f))
27 static guint8* nullified_class_init_trampoline;
30 * mono_arch_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 int this_reg = AMD64_RDI;
43 MonoDomain *domain = mono_domain_get ();
45 if (!mono_method_signature (m)->ret->byref && MONO_TYPE_ISSTRUCT (mono_method_signature (m)->ret))
48 mono_domain_lock (domain);
49 start = code = mono_code_manager_reserve (domain->code_mp, 20);
50 mono_domain_unlock (domain);
52 amd64_alu_reg_imm (code, X86_ADD, this_reg, sizeof (MonoObject));
53 /* FIXME: Optimize this */
54 amd64_mov_reg_imm (code, AMD64_RAX, addr);
55 amd64_jump_reg (code, AMD64_RAX);
56 g_assert ((code - start) < 20);
58 mono_arch_flush_icache (start, code - start);
64 mono_arch_patch_callsite (guint8 *code, guint8 *addr)
66 if (((code [-13] == 0x49) && (code [-12] == 0xbb)) || (code [-5] == 0xe8)) {
67 if (code [-5] != 0xe8)
68 InterlockedExchangePointer ((gpointer*)(code - 11), addr);
70 g_assert ((((guint64)(addr)) >> 32) == 0);
71 g_assert ((((guint64)(code)) >> 32) == 0);
72 InterlockedExchange ((guint32*)(code - 4), ((gint64)addr - (gint64)code));
75 else if ((code [-7] == 0x41) && (code [-6] == 0xff) && (code [-5] == 0x15)) {
76 /* call *<OFFSET>(%rip) */
77 gpointer *got_entry = (gpointer*)((guint8*)code + (*(guint32*)(code - 4)));
78 InterlockedExchangePointer (got_entry, addr);
83 mono_arch_nullify_class_init_trampoline (guint8 *code, gssize *regs)
88 * A given byte sequence can match more than case here, so we have to be
89 * really careful about the ordering of the cases. Longer sequences
92 if ((code [-4] == 0x41) && (code [-3] == 0xff) && (code [-2] == 0x15)) {
93 gpointer *vtable_slot;
95 /* call *<OFFSET>(%rip) */
96 vtable_slot = mono_arch_get_vcall_slot_addr (code + 3, (gpointer*)regs);
97 g_assert (vtable_slot);
99 *vtable_slot = nullified_class_init_trampoline;
100 } else if (code [-2] == 0xe8) {
102 guint8 *buf = code - 2;
109 } else if ((code [0] == 0x49) && (code [1] == 0xff)) {
111 /* amd64_set_reg_template is 10 bytes long */
112 guint8* buf = code - 10;
114 /* FIXME: Make this thread safe */
115 /* Padding code suggested by the AMD64 Opt Manual */
129 } else if (code [0] == 0x90 || code [0] == 0xeb || code [0] == 0x66) {
130 /* Already changed by another thread */
133 printf ("Invalid trampoline sequence: %x %x %x %x %x %x %x\n", code [0], code [1], code [2], code [3],
134 code [4], code [5], code [6]);
135 g_assert_not_reached ();
140 mono_arch_patch_delegate_trampoline (guint8 *code, guint8 *tramp, gssize *regs, guint8 *addr)
146 if ((code [-3] == 0xff) && (amd64_modrm_reg (code [-2]) == 0x2) && (amd64_modrm_mod (code [-2]) == 0x1)) {
147 /* call *[reg+disp8] */
148 if (IS_REX (code [-4]))
150 reg = amd64_modrm_rm (code [-2]);
151 disp = *(guint8*)(code - 1);
152 //printf ("B: [%%r%d+0x%x]\n", reg, disp);
157 for (i = -16; i < 0; ++i)
158 printf ("%d ", code [i]);
160 g_assert_not_reached ();
163 reg += amd64_rex_b (rex);
165 /* R11 is clobbered by the trampoline code */
166 g_assert (reg != AMD64_R11);
168 *(gpointer*)(((guint64)(regs [reg])) + disp) = addr;
172 mono_arch_create_trampoline_code (MonoTrampolineType tramp_type)
174 guint8 *buf, *code, *tramp;
175 int i, lmf_offset, offset, method_offset, tramp_offset, saved_regs_offset, saved_fpregs_offset, framesize;
178 if (tramp_type == MONO_TRAMPOLINE_JUMP)
183 code = buf = mono_global_codeman_reserve (512);
185 framesize = 512 + sizeof (MonoLMF);
186 framesize = (framesize + (MONO_ARCH_FRAME_ALIGNMENT - 1)) & ~ (MONO_ARCH_FRAME_ALIGNMENT - 1);
191 * Allocate a new stack frame and transfer the two arguments received on
192 * the stack to our frame.
194 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
195 amd64_pop_reg (code, AMD64_R11);
197 amd64_push_reg (code, AMD64_RBP);
198 amd64_mov_reg_reg (code, AMD64_RBP, AMD64_RSP, 8);
199 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, framesize);
202 * The method is at offset -8 from the new RBP, so no need to
206 method_offset = - offset;
209 tramp_offset = - offset;
210 amd64_mov_membase_reg (code, AMD64_RBP, tramp_offset, AMD64_R11, 8);
212 /* Save all registers */
214 offset += AMD64_NREG * 8;
215 saved_regs_offset = - offset;
216 for (i = 0; i < AMD64_NREG; ++i)
217 amd64_mov_membase_reg (code, AMD64_RBP, saved_regs_offset + (i * 8), i, 8);
219 saved_fpregs_offset = - offset;
220 for (i = 0; i < 8; ++i)
221 amd64_movsd_membase_reg (code, AMD64_RBP, saved_fpregs_offset + (i * 8), i);
225 offset += sizeof (MonoLMF);
226 lmf_offset = - offset;
230 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RBP, 8, 8);
232 amd64_mov_reg_imm (code, AMD64_R11, 0);
233 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, rip), AMD64_R11, 8);
235 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RSP, framesize, 8);
236 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, ebp), AMD64_R11, 8);
238 amd64_mov_reg_reg (code, AMD64_R11, AMD64_RSP, 8);
239 amd64_alu_reg_imm (code, X86_ADD, AMD64_R11, framesize + 16);
240 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, rsp), AMD64_R11, 8);
242 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RBP, method_offset, 8);
243 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, method), AMD64_R11, 8);
244 /* Save callee saved regs */
245 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, rbx), AMD64_RBX, 8);
246 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, r12), AMD64_R12, 8);
247 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, r13), AMD64_R13, 8);
248 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, r14), AMD64_R14, 8);
249 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, r15), AMD64_R15, 8);
251 amd64_mov_reg_imm (code, AMD64_R11, mono_get_lmf_addr);
252 amd64_call_reg (code, AMD64_R11);
255 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, lmf_addr), AMD64_RAX, 8);
256 /* Save previous_lmf */
257 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RAX, 0, 8);
258 amd64_mov_membase_reg (code, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, previous_lmf), AMD64_R11, 8);
260 amd64_lea_membase (code, AMD64_R11, AMD64_RBP, lmf_offset);
261 amd64_mov_membase_reg (code, AMD64_RAX, 0, AMD64_R11, 8);
265 /* Arg1 is the pointer to the saved registers */
266 amd64_lea_membase (code, AMD64_RDI, AMD64_RBP, saved_regs_offset);
268 /* Arg2 is the address of the calling code */
270 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_RBP, 8, 8);
272 amd64_mov_reg_imm (code, AMD64_RSI, 0);
274 /* Arg3 is the method/vtable ptr */
275 amd64_mov_reg_membase (code, AMD64_RDX, AMD64_RBP, method_offset, 8);
277 /* Arg4 is the trampoline address */
278 amd64_mov_reg_membase (code, AMD64_RCX, AMD64_RBP, tramp_offset, 8);
280 if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT)
281 tramp = (guint8*)mono_class_init_trampoline;
282 else if (tramp_type == MONO_TRAMPOLINE_AOT)
283 tramp = (guint8*)mono_aot_trampoline;
284 else if (tramp_type == MONO_TRAMPOLINE_DELEGATE)
285 tramp = (guint8*)mono_delegate_trampoline;
287 tramp = (guint8*)mono_magic_trampoline;
289 amd64_mov_reg_imm (code, AMD64_RAX, tramp);
290 amd64_call_reg (code, AMD64_RAX);
294 amd64_mov_reg_membase (code, AMD64_RCX, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, previous_lmf), 8);
295 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RBP, lmf_offset + G_STRUCT_OFFSET (MonoLMF, lmf_addr), 8);
296 amd64_mov_membase_reg (code, AMD64_R11, 0, AMD64_RCX, 8);
298 /* Restore argument registers */
299 for (i = 0; i < AMD64_NREG; ++i)
300 if (AMD64_IS_ARGUMENT_REG (i))
301 amd64_mov_reg_membase (code, i, AMD64_RBP, saved_regs_offset + (i * 8), 8);
303 for (i = 0; i < 8; ++i)
304 amd64_movsd_reg_membase (code, i, AMD64_RBP, saved_fpregs_offset + (i * 8));
309 if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT)
312 /* call the compiled method */
313 amd64_jump_reg (code, X86_EAX);
315 g_assert ((code - buf) <= 512);
317 mono_arch_flush_icache (buf, code - buf);
319 if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT) {
320 /* Initialize the nullified class init trampoline used in the AOT case */
321 nullified_class_init_trampoline = code = mono_global_codeman_reserve (16);
328 #define TRAMPOLINE_SIZE 34
331 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
333 guint8 *code, *buf, *tramp, *real_code;
334 int size, jump_offset;
336 tramp = mono_get_trampoline_code (tramp_type);
338 code = buf = g_alloca (TRAMPOLINE_SIZE);
340 /* push trampoline address */
341 amd64_lea_membase (code, AMD64_R11, AMD64_RIP, -7);
342 amd64_push_reg (code, AMD64_R11);
345 if (amd64_is_imm32 ((gint64)arg1))
346 amd64_push_imm (code, (gint64)arg1);
348 amd64_mov_reg_imm (code, AMD64_R11, arg1);
349 amd64_push_reg (code, AMD64_R11);
352 jump_offset = code - buf;
353 amd64_jump_disp (code, 0xffffffff);
355 g_assert ((code - buf) <= TRAMPOLINE_SIZE);
357 mono_domain_lock (domain);
359 * FIXME: Changing the size to code - buf causes strange crashes during
362 real_code = mono_code_manager_reserve (domain->code_mp, TRAMPOLINE_SIZE);
364 mono_domain_unlock (domain);
366 memcpy (real_code, buf, size);
369 g_assert ((((gint64)tramp) >> 32) == 0);
370 code = (guint8*)real_code + jump_offset;
371 amd64_jump_disp (code, tramp - code);
373 mono_jit_stats.method_trampolines++;
378 mono_arch_flush_icache (real_code, size);
384 mono_arch_invalidate_method (MonoJitInfo *ji, void *func, gpointer func_arg)
386 /* FIXME: This is not thread safe */
387 guint8 *code = ji->code_start;
389 amd64_mov_reg_imm (code, AMD64_RDI, func_arg);
390 amd64_mov_reg_imm (code, AMD64_R11, func);
392 x86_push_imm (code, (guint64)func_arg);
393 amd64_call_reg (code, AMD64_R11);
397 * This method is only called when running in the Mono Debugger.
400 mono_debugger_create_notification_function (gpointer *notification_address)
404 ptr = buf = mono_global_codeman_reserve (16);
406 x86_breakpoint (buf);
407 if (notification_address)
408 *notification_address = buf;