#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:
+ * @gsctx: the generic sharing context
* @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 (MonoGenericSharingContext *gsctx, MonoMethod *m, gpointer addr)
{
guint8 *code, *start;
int this_pos = 4;
MonoDomain *domain = mono_domain_get ();
- if (!mono_method_signature (m)->ret->byref && MONO_TYPE_ISSTRUCT (mono_method_signature (m)->ret))
+ if (MONO_TYPE_ISSTRUCT (mono_method_signature (m)->ret))
this_pos = 8;
mono_domain_lock (domain);
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 *method_start, guint8 *orig_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);
+ guint8 *code;
+ guint8 buf [8];
+ gboolean can_write = mono_breakpoint_clean_code (method_start, orig_code, 8, buf, sizeof (buf));
+
+ code = buf + 8;
+ if (mono_running_on_valgrind ())
+ can_write = FALSE;
+
+ /* 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;
+ orig_code -= 6;
+ if ((code [1] == 0xe8)) {
+ if (can_write) {
+ InterlockedExchange ((gint32*)(orig_code + 2), (guint)addr - ((guint)orig_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 if (code [1] == 0xe9) {
+ /* A PLT entry: jmp <DISP> */
+ if (can_write)
+ InterlockedExchange ((gint32*)(orig_code + 2), (guint)addr - ((guint)orig_code + 1) - 5);
+ } 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;
+void
+mono_arch_patch_plt_entry (guint8 *code, guint8 *addr)
+{
+ /* A PLT entry: jmp <DISP> */
+ g_assert (code [0] == 0xe9);
- return addr;
+ if (!mono_running_on_valgrind ())
+ InterlockedExchange ((gint32*)(code + 1), (guint)addr - (guint)code - 5);
}
-/*
- * 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);
+ guint8 buf [16];
+ gboolean can_write = mono_breakpoint_clean_code (NULL, code, 6, buf, sizeof (buf));
+
+ if (!can_write)
+ return;
code -= 5;
if (code [0] == 0xe8) {
/* 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_nullify_plt_entry (guint8 *code)
+{
+ if (!mono_running_on_valgrind ()) {
+ guint32 ops;
+
+ ops = 0xfeeb;
+ InterlockedExchange ((gint32*)code, ops);
+
+ /* Then change the other bytes to a nop */
+ code [2] = 0x90;
+ code [3] = 0x90;
+ code [4] = 0x90;
+
+ /* Change the first byte to a nop */
+ ops = 0xc3;
+ InterlockedExchange ((gint32*)code, ops);
+ }
+}
+
guchar*
mono_arch_create_trampoline_code (MonoTrampolineType tramp_type)
{
- guint8 *buf, *code;
+ guint8 *buf, *code, *tramp;
+ int pushed_args, pushed_args_caller_saved;
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)
+ */
+
+ /* If this is a generic class init the argument is not on the
+ * stack yet but in MONO_ARCH_VTABLE_REG. We first check
+ * whether the vtable is already initialized in which case we
+ * just return. Otherwise we push it and continue.
+ */
+ if (tramp_type == MONO_TRAMPOLINE_GENERIC_CLASS_INIT) {
+ static int byte_offset = -1;
+ static guint8 bitmask;
+
+ guint8 *jump;
+
+ if (byte_offset < 0)
+ mono_marshal_find_bitfield_offset (MonoVTable, initialized, &byte_offset, &bitmask);
+
+ x86_test_membase_imm (buf, MONO_ARCH_VTABLE_REG, byte_offset, bitmask);
+ jump = buf;
+ x86_branch8 (buf, X86_CC_Z, -1, 1);
+
+ x86_ret (buf);
+
+ x86_patch (jump, buf);
+ x86_push_reg (buf, MONO_ARCH_VTABLE_REG);
+ }
+
+ /* Put all registers into an array on the stack
+ * If this code is changed, make sure to update the offset value in
+ * mono_arch_find_this_argument () in mini-x86.c.
+ */
+ 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_caller_saved = pushed_args = 8;
+
+ /* Align stack on apple */
+ x86_alu_reg_imm (buf, X86_SUB, X86_ESP, 4);
+
+ pushed_args ++;
/* 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 ESP */
+ x86_push_reg (buf, X86_ESP);
+ /* Adjust ESP so it points to the previous frame */
+ x86_alu_membase_imm (buf, X86_ADD, X86_ESP, 0, (pushed_args + 2) * 4);
+
+ pushed_args ++;
+
/* save method info */
- x86_push_membase (buf, X86_ESP, 32);
+ if ((tramp_type == MONO_TRAMPOLINE_GENERIC) || (tramp_type == MONO_TRAMPOLINE_JUMP))
+ x86_push_membase (buf, X86_ESP, pushed_args * sizeof (gpointer));
+ else
+ x86_push_imm (buf, 0);
+
+ pushed_args++;
+
+ /* On apple, the stack is correctly aligned to 16 bytes because pushed_args is
+ * 16 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.
+ */
+ g_assert (pushed_args == 16);
+
/* get the address of lmf for the current thread */
x86_call_code (buf, mono_get_lmf_addr);
/* push lmf */
x86_push_reg (buf, X86_EAX);
/* push *lfm (previous_lmf) */
x86_push_membase (buf, X86_EAX, 0);
+ /* Signal to mono_arch_find_jit_info () that this is a trampoline frame */
+ x86_alu_membase_imm (buf, X86_ADD, X86_ESP, 0, 1);
/* *(lmf) = ESP */
x86_mov_membase_reg (buf, X86_EAX, 0, X86_ESP, 4);
/* save LFM end */
+ pushed_args += 2;
+
+ /* starting the call sequence */
+
+ /* 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 */
-
- if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT)
- x86_call_code (buf, x86_class_init_trampoline);
- else if (tramp_type == MONO_TRAMPOLINE_AOT)
- x86_call_code (buf, x86_aot_trampoline);
- else
- x86_call_code (buf, x86_magic_trampoline);
- x86_alu_reg_imm (buf, X86_ADD, X86_ESP, 8*4);
+ 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
+
+ tramp = (guint8*)mono_get_trampoline_func (tramp_type);
+ x86_call_code (buf, tramp);
+
+ x86_alu_reg_imm (buf, X86_ADD, X86_ESP, 4*4);
+
+ pushed_args -= 4;
+
+ /* Check for thread interruption */
+ /* This is not perf critical code so no need to check the interrupt flag */
+ x86_push_reg (buf, X86_EAX);
+ x86_call_code (buf, (guint8*)mono_thread_force_interruption_checkpoint);
+ x86_pop_reg (buf, X86_EAX);
+
+ /* Restore LMF */
- /* restore LMF start */
/* ebx = previous_lmf */
x86_pop_reg (buf, X86_EBX);
+ pushed_args--;
+ x86_alu_reg_imm (buf, X86_SUB, X86_EBX, 1);
+
/* edi = lmf */
x86_pop_reg (buf, X86_EDI);
+ pushed_args--;
+
/* *(lmf) = previous_lmf */
x86_mov_membase_reg (buf, X86_EDI, 0, X86_EBX, 4);
+
/* discard method info */
x86_pop_reg (buf, X86_ESI);
+ pushed_args--;
+
+ /* discard ESP */
+ x86_pop_reg (buf, X86_ESI);
+ pushed_args--;
+
/* restore caller saved regs */
x86_pop_reg (buf, X86_EBX);
x86_pop_reg (buf, X86_EDI);
x86_pop_reg (buf, X86_ESI);
x86_pop_reg (buf, X86_EBP);
+ pushed_args -= 4;
+
/* discard save IP */
- x86_alu_reg_imm (buf, X86_ADD, X86_ESP, 4);
+ x86_alu_reg_imm (buf, X86_ADD, X86_ESP, 4);
+ pushed_args--;
+
/* 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, (pushed_args - pushed_args_caller_saved + X86_ECX) * 4, 4);
+ x86_mov_reg_membase (buf, X86_EDX, X86_ESP, (pushed_args - pushed_args_caller_saved + X86_EDX) * 4, 4);
+
+ /* Pop saved reg array + stack align + method ptr */
+ x86_alu_reg_imm (buf, X86_ADD, X86_ESP, 10 * 4);
+
+ pushed_args -= 10;
+
+ /* We've popped one more stack item than we've pushed (the
+ method ptr argument), so we must end up at -1. */
+ g_assert (pushed_args == -1);
- if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT)
+ if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT ||
+ tramp_type == MONO_TRAMPOLINE_GENERIC_CLASS_INIT ||
+ tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
x86_ret (buf);
else
/* call the compiled method */
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 MonoJitInfo*
-create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain)
+gpointer
+mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
{
guint8 *code, *buf, *tramp;
- MonoJitInfo *ji;
tramp = mono_get_trampoline_code (tramp_type);
mono_domain_lock (domain);
- code = buf = mono_code_manager_reserve (domain->code_mp, TRAMPOLINE_SIZE);
+ code = buf = mono_code_manager_reserve_align (domain->code_mp, TRAMPOLINE_SIZE, 4);
mono_domain_unlock (domain);
x86_push_imm (buf, arg1);
x86_jump_code (buf, tramp);
g_assert ((buf - code) <= TRAMPOLINE_SIZE);
- ji = g_new0 (MonoJitInfo, 1);
- ji->code_start = code;
- ji->code_size = buf - code;
+ mono_arch_flush_icache (code, buf - code);
- mono_arch_flush_icache (ji->code_start, ji->code_size);
+ if (code_len)
+ *code_len = buf - code;
- mono_jit_stats.method_trampolines++;
-
- return ji;
-}
-
-MonoJitInfo*
-mono_arch_create_jump_trampoline (MonoMethod *method)
-{
- MonoJitInfo *ji = create_specific_trampoline (method, MONO_TRAMPOLINE_JUMP, mono_domain_get ());
-
- ji->method = method;
- return ji;
+ return code;
}
-/**
- * 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)
+mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot)
{
- MonoJitInfo *ji;
- gpointer code_start;
+ guint8 *tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_RGCTX_LAZY_FETCH);
+ guint8 *code, *buf;
+ guint8 **rgctx_null_jumps;
+ int tramp_size;
+ int depth, index;
+ int i;
+ gboolean mrgctx;
+
+ g_assert (tramp);
+
+ mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
+ index = MONO_RGCTX_SLOT_INDEX (slot);
+ if (mrgctx)
+ index += sizeof (MonoMethodRuntimeGenericContext) / sizeof (gpointer);
+ for (depth = 0; ; ++depth) {
+ int size = mono_class_rgctx_get_array_size (depth, mrgctx);
+
+ if (index < size - 1)
+ break;
+ index -= size - 1;
+ }
- ji = create_specific_trampoline (method, MONO_TRAMPOLINE_GENERIC, mono_domain_get ());
- code_start = ji->code_start;
- g_free (ji);
+ tramp_size = 36 + 6 * depth;
- return code_start;
-}
+ code = buf = mono_global_codeman_reserve (tramp_size);
-gpointer
-mono_arch_create_jit_trampoline_from_token (MonoImage *image, guint32 token)
-{
- MonoDomain *domain = mono_domain_get ();
- MonoJitInfo *ji;
- gpointer code_start;
- guint8 *buf, *start;
+ rgctx_null_jumps = g_malloc (sizeof (guint8*) * (depth + 2));
- mono_domain_lock (domain);
- buf = start = mono_code_manager_reserve (domain->code_mp, 2 * sizeof (gpointer));
- mono_domain_unlock (domain);
+ /* load vtable/mrgctx ptr */
+ x86_mov_reg_membase (buf, X86_EAX, X86_ESP, 4, 4);
+ if (!mrgctx) {
+ /* load rgctx ptr from vtable */
+ x86_mov_reg_membase (buf, X86_EAX, X86_EAX, G_STRUCT_OFFSET (MonoVTable, runtime_generic_context), 4);
+ /* is the rgctx ptr null? */
+ x86_test_reg_reg (buf, X86_EAX, X86_EAX);
+ /* if yes, jump to actual trampoline */
+ rgctx_null_jumps [0] = buf;
+ x86_branch8 (buf, X86_CC_Z, -1, 1);
+ }
- *(gpointer*)buf = image;
- buf += sizeof (gpointer);
- *(guint32*)buf = token;
+ for (i = 0; i < depth; ++i) {
+ /* load ptr to next array */
+ if (mrgctx && i == 0)
+ x86_mov_reg_membase (buf, X86_EAX, X86_EAX, sizeof (MonoMethodRuntimeGenericContext), 4);
+ else
+ x86_mov_reg_membase (buf, X86_EAX, X86_EAX, 0, 4);
+ /* is the ptr null? */
+ x86_test_reg_reg (buf, X86_EAX, X86_EAX);
+ /* if yes, jump to actual trampoline */
+ rgctx_null_jumps [i + 1] = buf;
+ x86_branch8 (buf, X86_CC_Z, -1, 1);
+ }
- ji = create_specific_trampoline (start, MONO_TRAMPOLINE_AOT, domain);
- code_start = ji->code_start;
- g_free (ji);
+ /* fetch slot */
+ x86_mov_reg_membase (buf, X86_EAX, X86_EAX, sizeof (gpointer) * (index + 1), 4);
+ /* is the slot null? */
+ x86_test_reg_reg (buf, X86_EAX, X86_EAX);
+ /* if yes, jump to actual trampoline */
+ rgctx_null_jumps [depth + 1] = buf;
+ x86_branch8 (buf, X86_CC_Z, -1, 1);
+ /* otherwise return */
+ x86_ret (buf);
- return code_start;
-}
+ for (i = mrgctx ? 1 : 0; i <= depth + 1; ++i)
+ x86_patch (rgctx_null_jumps [i], buf);
+
+ g_free (rgctx_null_jumps);
+
+ /*
+ * our stack looks like this (tos on top):
+ *
+ * | ret addr |
+ * | vtable ptr |
+ * | ... |
+ *
+ * the trampoline code expects it to look like this:
+ *
+ * | vtable ptr |
+ * | ret addr |
+ * | ... |
+ *
+ * whereas our caller expects to still have one argument on
+ * the stack when we return, so we transform the stack into
+ * this:
+ *
+ * | vtable ptr |
+ * | ret addr |
+ * | dummy |
+ * | ... |
+ *
+ * which actually only requires us to push the vtable ptr, and
+ * the "old" vtable ptr becomes the dummy.
+ */
+
+ x86_push_membase (buf, X86_ESP, 4);
+
+ x86_mov_reg_imm (buf, X86_EAX, slot);
+ x86_jump_code (buf, tramp);
-/**
- * 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)
-{
- MonoJitInfo *ji;
- gpointer code;
+ mono_arch_flush_icache (code, buf - code);
- ji = create_specific_trampoline (vtable, MONO_TRAMPOLINE_CLASS_INIT, vtable->domain);
- code = ji->code_start;
- g_free (ji);
+ g_assert (buf - code <= tramp_size);
return code;
}
+guint32
+mono_arch_get_rgctx_lazy_fetch_offset (gpointer *regs)
+{
+ return (guint32)(regs [X86_EAX]);
+}
+
void
mono_arch_invalidate_method (MonoJitInfo *ji, void *func, gpointer func_arg)
{
x86_push_imm (code, func_arg);
x86_call_code (code, (guint8*)func);
}
-
-/*
- * This method is only called when running in the Mono Debugger.
- */
-gpointer
-mono_debugger_create_notification_function (gpointer *notification_address)
-{
- guint8 *ptr, *buf;
-
- ptr = buf = mono_global_codeman_reserve (16);
-
- x86_breakpoint (buf);
- if (notification_address)
- *notification_address = buf;
- x86_ret (buf);
-
- return ptr;
-}
projects / mono.git / blobdiff