#include <mono/metadata/metadata-internals.h>
#include <mono/metadata/marshal.h>
#include <mono/metadata/tabledefs.h>
-#include <mono/arch/x86/x86-codegen.h>
+#include <mono/metadata/mono-debug.h>
#include <mono/metadata/mono-debug-debugger.h>
+#include <mono/arch/x86/x86-codegen.h>
#ifdef HAVE_VALGRIND_MEMCHECK_H
#include <valgrind/memcheck.h>
#include "mini.h"
#include "mini-x86.h"
+static guint8* nullified_class_init_trampoline;
+
/*
- * get_unbox_trampoline:
+ * mono_arch_get_unbox_trampoline:
* @m: method pointer
* @addr: pointer to native code for @m
*
* this argument. This method returns a pointer to a trampoline which does
* unboxing before calling the method
*/
-static gpointer
-get_unbox_trampoline (MonoMethod *m, gpointer addr)
+gpointer
+mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
{
guint8 *code, *start;
int this_pos = 4;
return start;
}
-/**
- * x86_magic_trampoline:
- * @eax: saved x86 register
- * @ecx: saved x86 register
- * @edx: saved x86 register
- * @esi: saved x86 register
- * @edi: saved x86 register
- * @ebx: saved x86 register
- * @code: pointer into caller code
- * @method: the method to translate
- *
- * This method is called by the trampoline functions for virtual
- * methods. It inspects the caller code to find the address of the
- * vtable slot, then calls the JIT compiler and writes the address
- * of the compiled method back to the vtable. All virtual methods
- * are called with: x86_call_membase (inst, basereg, disp). We always
- * use 32 bit displacement to ensure that the length of the call
- * instruction is 6 bytes. We need to get the value of the basereg
- * and the constant displacement.
- */
-static gpointer
-x86_magic_trampoline (int eax, int ecx, int edx, int esi, int edi,
- int ebx, guint8 *code, MonoMethod *m)
+void
+mono_arch_patch_callsite (guint8 *code, guint8 *addr)
{
- gpointer addr;
- gpointer *vtable_slot;
- int regs [X86_NREG];
-
- addr = mono_compile_method (m);
- g_assert (addr);
-
- /* the method was jumped to */
- if (!code)
- return addr;
-
- regs [X86_EAX] = eax;
- regs [X86_ECX] = ecx;
- regs [X86_EDX] = edx;
- regs [X86_ESI] = esi;
- regs [X86_EDI] = edi;
- regs [X86_EBX] = ebx;
-
- vtable_slot = mono_arch_get_vcall_slot_addr (code, (gpointer*)regs);
- if (!vtable_slot) {
- /* go to the start of the call instruction
- *
- * address_byte = (m << 6) | (o << 3) | reg
- * call opcode: 0xff address_byte displacement
- * 0xff m=1,o=2 imm8
- * 0xff m=2,o=2 imm32
- */
- code -= 6;
- if ((code [1] == 0xe8)) {
- if (!mono_running_on_valgrind ()) {
- MonoJitInfo *ji =
- mono_jit_info_table_find (mono_domain_get (), (char*)code);
- MonoJitInfo *target_ji =
- mono_jit_info_table_find (mono_domain_get (), addr);
-
- if (mono_method_same_domain (ji, target_ji)) {
- InterlockedExchange ((gint32*)(code + 2), (guint)addr - ((guint)code + 1) - 5);
+ /* go to the start of the call instruction
+ *
+ * address_byte = (m << 6) | (o << 3) | reg
+ * call opcode: 0xff address_byte displacement
+ * 0xff m=1,o=2 imm8
+ * 0xff m=2,o=2 imm32
+ */
+ code -= 6;
+ if ((code [1] == 0xe8)) {
+ if (!mono_running_on_valgrind ()) {
+ InterlockedExchange ((gint32*)(code + 2), (guint)addr - ((guint)code + 1) - 5);
#ifdef HAVE_VALGRIND_MEMCHECK_H
- /* Tell valgrind to recompile the patched code */
- //VALGRIND_DISCARD_TRANSLATIONS (code + 2, code + 6);
+ /* Tell valgrind to recompile the patched code */
+ //VALGRIND_DISCARD_TRANSLATIONS (code + 2, code + 6);
#endif
- }
- }
- return addr;
- } else {
- printf ("Invalid trampoline sequence: %x %x %x %x %x %x %x\n", code [0], code [1], code [2], code [3],
- code [4], code [5], code [6]);
- g_assert_not_reached ();
}
+ } else {
+ printf ("Invalid trampoline sequence: %x %x %x %x %x %x %x\n", code [0], code [1], code [2], code [3],
+ code [4], code [5], code [6]);
+ g_assert_not_reached ();
}
-
- if (m->klass->valuetype && !mono_aot_is_got_entry (code, (guint8*)vtable_slot))
- addr = get_unbox_trampoline (m, addr);
-
- if (mono_aot_is_got_entry (code, (guint8*)vtable_slot) || mono_domain_owns_vtable_slot (mono_domain_get (), vtable_slot))
- *vtable_slot = addr;
-
- return addr;
}
-/*
- * x86_aot_trampoline:
- *
- * This trampoline handles calls made from AOT code. We try to bypass the
- * normal JIT compilation logic to avoid loading the metadata for the method.
- */
-static gpointer
-x86_aot_trampoline (int eax, int ecx, int edx, int esi, int edi,
- int ebx, guint8 *code, guint8 *token_info)
-{
- MonoImage *image;
- guint32 token;
- MonoMethod *method;
- gpointer addr;
- gpointer *vtable_slot;
- int regs [X86_NREG];
-
- image = *(gpointer*)token_info;
- token_info += sizeof (gpointer);
- token = *(guint32*)token_info;
-
- /* Later we could avoid allocating the MonoMethod */
- method = mono_get_method (image, token, NULL);
- g_assert (method);
-
- if (method->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED)
- method = mono_marshal_get_synchronized_wrapper (method);
-
- addr = mono_compile_method (method);
- g_assert (addr);
-
- regs [X86_EAX] = eax;
- regs [X86_ECX] = ecx;
- regs [X86_EDX] = edx;
- regs [X86_ESI] = esi;
- regs [X86_EDI] = edi;
- regs [X86_EBX] = ebx;
-
- vtable_slot = mono_arch_get_vcall_slot_addr (code, (gpointer*)regs);
- g_assert (vtable_slot);
-
- if (method->klass->valuetype)
- addr = get_unbox_trampoline (method, addr);
-
- if (mono_domain_owns_vtable_slot (mono_domain_get (), vtable_slot))
- *vtable_slot = addr;
-
- return addr;
-}
-
-/**
- * x86_class_init_trampoline:
- * @eax: saved x86 register
- * @ecx: saved x86 register
- * @edx: saved x86 register
- * @esi: saved x86 register
- * @edi: saved x86 register
- * @ebx: saved x86 register
- * @code: pointer into caller code
- * @vtable: the type to initialize
- *
- * This method calls mono_runtime_class_init () to run the static constructor
- * for the type, then patches the caller code so it is not called again.
- */
-static void
-x86_class_init_trampoline (int eax, int ecx, int edx, int esi, int edi,
- int ebx, guint8 *code, MonoVTable *vtable)
+void
+mono_arch_nullify_class_init_trampoline (guint8 *code, gssize *regs)
{
- mono_runtime_class_init (vtable);
-
code -= 5;
if (code [0] == 0xe8) {
if (!mono_running_on_valgrind ()) {
/* Then atomically change the first 4 bytes to a nop as well */
ops = 0x90909090;
InterlockedExchange ((gint32*)code, ops);
-
#ifdef HAVE_VALGRIND_MEMCHECK_H
/* FIXME: the calltree skin trips on the self modifying code above */
;
} else if ((code [-1] == 0xff) && (x86_modrm_reg (code [0]) == 0x2)) {
/* call *<OFFSET>(<REG>) -> Call made from AOT code */
- /* FIXME: Patch up the trampoline */
- ;
+ gpointer *vtable_slot;
+
+ vtable_slot = mono_arch_get_vcall_slot_addr (code + 5, (gpointer*)regs);
+ g_assert (vtable_slot);
+
+ *vtable_slot = nullified_class_init_trampoline;
} else {
printf ("Invalid trampoline sequence: %x %x %x %x %x %x %x\n", code [0], code [1], code [2], code [3],
code [4], code [5], code [6]);
}
}
+void
+mono_arch_patch_delegate_trampoline (guint8 *code, guint8 *tramp, gssize *regs, guint8 *addr)
+{
+ guint32 reg;
+ guint32 disp;
+
+ if ((code [-3] == 0xff) && (x86_modrm_reg (code [-2]) == 0x2) && (x86_modrm_mod (code [-2]) == 0x1)) {
+ /* call *[reg+disp8] */
+ reg = x86_modrm_rm (code [-2]);
+ disp = *(guint8*)(code - 1);
+ //printf ("B: [%%r%d+0x%x]\n", reg, disp);
+ }
+ else {
+ int i;
+
+ for (i = -16; i < 0; ++i)
+ printf ("%d ", code [i]);
+ printf ("\n");
+ g_assert_not_reached ();
+ }
+
+ *(gpointer*)(((guint32)(regs [reg])) + disp) = addr;
+}
+
guchar*
mono_arch_create_trampoline_code (MonoTrampolineType tramp_type)
{
guint8 *buf, *code;
+ int pushed_args;
code = buf = mono_global_codeman_reserve (256);
- /* save caller save regs because we need to do a call */
+ /* Note that there is a single argument to the trampoline
+ * and it is stored at: esp + pushed_args * sizeof (gpointer)
+ * the ret address is at: esp + (pushed_args + 1) * sizeof (gpointer)
+ */
+ /* Put all registers into an array on the stack */
+ x86_push_reg (buf, X86_EDI);
+ x86_push_reg (buf, X86_ESI);
+ x86_push_reg (buf, X86_EBP);
+ x86_push_reg (buf, X86_ESP);
+ x86_push_reg (buf, X86_EBX);
x86_push_reg (buf, X86_EDX);
- x86_push_reg (buf, X86_EAX);
x86_push_reg (buf, X86_ECX);
+ x86_push_reg (buf, X86_EAX);
+
+ pushed_args = 8;
/* save LMF begin */
if (tramp_type == MONO_TRAMPOLINE_JUMP)
x86_push_imm (buf, 0);
else
- x86_push_membase (buf, X86_ESP, 16);
+ x86_push_membase (buf, X86_ESP, (pushed_args + 1) * sizeof (gpointer));
+
+ pushed_args++;
x86_push_reg (buf, X86_EBP);
x86_push_reg (buf, X86_ESI);
x86_push_reg (buf, X86_EDI);
x86_push_reg (buf, X86_EBX);
+ pushed_args += 4;
+
/* save method info */
- x86_push_membase (buf, X86_ESP, 32);
+ x86_push_membase (buf, X86_ESP, pushed_args * sizeof (gpointer));
+
+ pushed_args++;
+
+ /* the stack is correctly aligned to 16 bytes because pushed_args is 14
+ * and there is the extra trampoline arg + the return ip pushed by call
+ * FIXME: Note that if an exception happens while some args are pushed
+ * on the stack, the stack will be misaligned.
+ */
+#ifdef __APPLE__
+ g_assert (pushed_args == 14);
+#endif
/* get the address of lmf for the current thread */
x86_call_code (buf, mono_get_lmf_addr);
/* push lmf */
x86_mov_membase_reg (buf, X86_EAX, 0, X86_ESP, 4);
/* save LFM end */
+ pushed_args += 2;
+
+ /* starting the call sequence */
+#ifdef __APPLE__
+ /* changing esp to keep the stack aligned */
+ x86_alu_reg_imm (buf, X86_SUB, X86_ESP, 8);
+ pushed_args += 2;
+#endif
+
+ /* FIXME: Push the trampoline address */
+ x86_push_imm (buf, 0);
+
+ pushed_args++;
+
/* push the method info */
- x86_push_membase (buf, X86_ESP, 44);
+ x86_push_membase (buf, X86_ESP, pushed_args * sizeof (gpointer));
+
+ pushed_args++;
+
/* push the return address onto the stack */
if (tramp_type == MONO_TRAMPOLINE_JUMP)
x86_push_imm (buf, 0);
else
- x86_push_membase (buf, X86_ESP, 52);
+ x86_push_membase (buf, X86_ESP, (pushed_args + 1) * sizeof (gpointer));
+ pushed_args++;
+ /* push the address of the register array */
+ x86_lea_membase (buf, X86_EAX, X86_ESP, (pushed_args - 8) * sizeof (gpointer));
+ x86_push_reg (buf, X86_EAX);
- /* save all register values */
- x86_push_reg (buf, X86_EBX);
- x86_push_reg (buf, X86_EDI);
- x86_push_reg (buf, X86_ESI);
- x86_push_membase (buf, X86_ESP, 64); /* EDX */
- x86_push_membase (buf, X86_ESP, 64); /* ECX */
- x86_push_membase (buf, X86_ESP, 64); /* EAX */
+ pushed_args++;
+
+#ifdef __APPLE__
+ /* check the stack is aligned after the ret ip is pushed */
+ /*x86_mov_reg_reg (buf, X86_EDX, X86_ESP, 4);
+ x86_alu_reg_imm (buf, X86_AND, X86_EDX, 15);
+ x86_alu_reg_imm (buf, X86_CMP, X86_EDX, 0);
+ x86_branch_disp (buf, X86_CC_Z, 3, FALSE);
+ x86_breakpoint (buf);*/
+#endif
if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT)
- x86_call_code (buf, x86_class_init_trampoline);
+ x86_call_code (buf, mono_class_init_trampoline);
else if (tramp_type == MONO_TRAMPOLINE_AOT)
- x86_call_code (buf, x86_aot_trampoline);
+ x86_call_code (buf, mono_aot_trampoline);
+ else if (tramp_type == MONO_TRAMPOLINE_DELEGATE)
+ x86_call_code (buf, mono_delegate_trampoline);
else
- x86_call_code (buf, x86_magic_trampoline);
- x86_alu_reg_imm (buf, X86_ADD, X86_ESP, 8*4);
+ x86_call_code (buf, mono_magic_trampoline);
+
+#ifdef __APPLE__
+ /* account for the alignment above */
+ x86_alu_reg_imm (buf, X86_ADD, X86_ESP, 6*4);
+#else
+ x86_alu_reg_imm (buf, X86_ADD, X86_ESP, 4*4);
+#endif
/* restore LMF start */
/* ebx = previous_lmf */
x86_alu_reg_imm (buf, X86_ADD, X86_ESP, 4);
/* restore LMF end */
- x86_alu_reg_imm (buf, X86_ADD, X86_ESP, 16);
+ /* Restore caller saved registers */
+ x86_mov_reg_membase (buf, X86_ECX, X86_ESP, 1 * 4, 4);
+ x86_mov_reg_membase (buf, X86_EDX, X86_ESP, 2 * 4, 4);
+
+ /* Pop saved reg array + method ptr */
+ x86_alu_reg_imm (buf, X86_ADD, X86_ESP, 9 * 4);
if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT)
x86_ret (buf);
g_assert ((buf - code) <= 256);
+ if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT) {
+ /* Initialize the nullified class init trampoline used in the AOT case */
+ nullified_class_init_trampoline = buf = mono_global_codeman_reserve (16);
+ x86_ret (buf);
+ }
+
return code;
}
#define TRAMPOLINE_SIZE 10
-static gpointer
-create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
+gpointer
+mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
{
guint8 *code, *buf, *tramp;
return code;
}
-MonoJitInfo*
-mono_arch_create_jump_trampoline (MonoMethod *method)
-{
- MonoJitInfo *ji;
- gpointer code;
- guint32 code_size;
-
- code = create_specific_trampoline (method, MONO_TRAMPOLINE_JUMP, mono_domain_get (), &code_size);
-
- ji = g_new0 (MonoJitInfo, 1);
- ji->code_start = code;
- ji->code_size = code_size;
- ji->method = method;
-
- return ji;
-}
-
-/**
- * mono_arch_create_jit_trampoline:
- * @method: pointer to the method info
- *
- * Creates a trampoline function for virtual methods. If the created
- * code is called it first starts JIT compilation of method,
- * and then calls the newly created method. I also replaces the
- * corresponding vtable entry (see x86_magic_trampoline).
- *
- * Returns: a pointer to the newly created code
- */
-gpointer
-mono_arch_create_jit_trampoline (MonoMethod *method)
-{
- return create_specific_trampoline (method, MONO_TRAMPOLINE_GENERIC, mono_domain_get (), NULL);
-}
-
-gpointer
-mono_arch_create_jit_trampoline_from_token (MonoImage *image, guint32 token)
-{
- MonoDomain *domain = mono_domain_get ();
- guint8 *buf, *start;
-
- mono_domain_lock (domain);
- buf = start = mono_code_manager_reserve (domain->code_mp, 2 * sizeof (gpointer));
- mono_domain_unlock (domain);
-
- *(gpointer*)buf = image;
- buf += sizeof (gpointer);
- *(guint32*)buf = token;
-
- return create_specific_trampoline (start, MONO_TRAMPOLINE_AOT, domain, NULL);
-}
-
-/**
- * mono_arch_create_class_init_trampoline:
- * @vtable: the type to initialize
- *
- * Creates a trampoline function to run a type initializer.
- * If the trampoline is called, it calls mono_runtime_class_init with the
- * given vtable, then patches the caller code so it does not get called any
- * more.
- *
- * Returns: a pointer to the newly created code
- */
-gpointer
-mono_arch_create_class_init_trampoline (MonoVTable *vtable)
-{
- return create_specific_trampoline (vtable, MONO_TRAMPOLINE_CLASS_INIT, vtable->domain, NULL);
-}
-
void
mono_arch_invalidate_method (MonoJitInfo *ji, void *func, gpointer func_arg)
{
/*
* This method is only called when running in the Mono Debugger.
*/
-gpointer
-mono_debugger_create_notification_function (gpointer *notification_address)
+guint8 *
+mono_debugger_create_notification_function ()
{
- guint8 *ptr, *buf;
-
- ptr = buf = mono_global_codeman_reserve (16);
+ guint8 *buf, *code;
+ code = buf = mono_global_codeman_reserve (2);
x86_breakpoint (buf);
- if (notification_address)
- *notification_address = buf;
x86_ret (buf);
-
- return ptr;
+ return code;
}
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