/*
- * trampoline.c: JIT trampoline code
+ * tramp-x86.c: JIT trampoline code for x86
*
* Authors:
* Dietmar Maurer (dietmar@ximian.com)
#include <glib.h>
#include <mono/metadata/appdomain.h>
+#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/metadata/monitor.h>
+#include <mono/arch/x86/x86-codegen.h>
#ifdef HAVE_VALGRIND_MEMCHECK_H
#include <valgrind/memcheck.h>
#include "mini.h"
#include "mini-x86.h"
-typedef enum {
- MONO_TRAMPOLINE_GENERIC,
- MONO_TRAMPOLINE_JUMP,
- MONO_TRAMPOLINE_CLASS_INIT
-} MonoTrampolineType;
-
-/* adapt to mini later... */
-#define mono_jit_share_code (1)
+static guint8* nullified_class_init_trampoline;
/*
- * Address of the x86 trampoline code. This is used by the debugger to check
- * whether a method is a trampoline.
- */
-guint8 *mono_generic_trampoline_code = NULL;
-
-/*
- * 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 (!m->signature->ret->byref && MONO_TYPE_ISSTRUCT (m->signature->ret))
+ if (MONO_TYPE_ISSTRUCT (mono_method_signature (m)->ret))
this_pos = 8;
- start = code = g_malloc (16);
+ start = code = mono_domain_code_reserve (domain, 16);
x86_alu_membase_imm (code, X86_ADD, X86_ESP, this_pos, sizeof (MonoObject));
x86_jump_code (code, addr);
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)
+gpointer
+mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
{
- guint8 reg;
- gint32 disp;
- char *o;
- gpointer addr;
+ guint8 *code, *start;
+ int buf_len;
+
+ MonoDomain *domain = mono_domain_get ();
+
+ buf_len = 10;
+
+ start = code = mono_domain_code_reserve (domain, buf_len);
- addr = mono_compile_method (m);
- g_assert (addr);
+ x86_mov_reg_imm (code, MONO_ARCH_RGCTX_REG, mrgctx);
+ x86_jump_code (code, addr);
+ g_assert ((code - start) <= buf_len);
+
+ mono_arch_flush_icache (start, code - start);
+
+ return start;
+}
+
+void
+mono_arch_patch_callsite (guint8 *method_start, guint8 *orig_code, guint8 *addr)
+{
+ guint8 *code;
+ guint8 buf [8];
+ gboolean can_write = mono_breakpoint_clean_code (method_start, orig_code, 8, buf, sizeof (buf));
- /* the method was jumped to */
- if (!code)
- return addr;
+ code = buf + 8;
+ if (mono_running_on_valgrind ())
+ can_write = FALSE;
/* go to the start of the call instruction
*
* 0xff m=2,o=2 imm32
*/
code -= 6;
- if ((code [1] != 0xe8) && (code [3] == 0xff) && ((code [4] & 0x18) == 0x10) && ((code [4] >> 6) == 1)) {
- reg = code [4] & 0x07;
- disp = (signed char)code [5];
- } else {
- if ((code [0] == 0xff) && ((code [1] & 0x18) == 0x10) && ((code [1] >> 6) == 2)) {
- reg = code [1] & 0x07;
- disp = *((gint32*)(code + 2));
- } else if ((code [1] == 0xe8)) {
- MonoJitInfo *ji =
- mono_jit_info_table_find (mono_domain_get (), code);
- MonoJitInfo *target_ji =
- mono_jit_info_table_find (mono_domain_get (), addr);
+ orig_code -= 6;
+ if ((code [1] == 0xe8)) {
+ if (can_write) {
+ InterlockedExchange ((gint32*)(orig_code + 2), (guint)addr - ((guint)orig_code + 1) - 5);
- /*
- * If the call was made from domain-neutral to domain-specific
- * code, we can't patch the call site.
- */
- if (ji && target_ji && ! (ji->domain_neutral && !target_ji->domain_neutral)) {
- *((guint32*)(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);
+ //VALGRIND_DISCARD_TRANSLATIONS (code + 2, code + 6);
#endif
- }
- return addr;
- } else if ((code [4] == 0xff) && (((code [5] >> 6) & 0x3) == 0) && (((code [5] >> 3) & 0x7) == 2)) {
- /*
- * This is a interface call: should check the above code can't catch it earlier
- * 8b 40 30 mov 0x30(%eax),%eax
- * ff 10 call *(%eax)
- */
- disp = 0;
- reg = code [5] & 0x07;
- } 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 ();
}
- }
-
- switch (reg) {
- case X86_EAX:
- o = (gpointer)eax;
- break;
- case X86_EDX:
- o = (gpointer)edx;
- break;
- case X86_ECX:
- o = (gpointer)ecx;
- break;
- case X86_ESI:
- o = (gpointer)esi;
- break;
- case X86_EDI:
- o = (gpointer)edi;
- break;
- case X86_EBX:
- o = (gpointer)ebx;
- break;
- default:
+ } 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 ();
}
+}
- o += disp;
-
- if (m->klass->valuetype)
- addr = get_unbox_trampoline (m, addr);
-
- *((gpointer *)o) = 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_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)
{
- int i;
+ guint8 buf [16];
+ gboolean can_write = mono_breakpoint_clean_code (NULL, code, 6, buf, sizeof (buf));
- mono_runtime_class_init (vtable);
+ if (!can_write)
+ return;
code -= 5;
if (code [0] == 0xe8) {
- for (i = 0; i < 5; ++i)
- x86_nop (code);
+ if (!mono_running_on_valgrind ()) {
+ guint32 ops;
+ /*
+ * Thread safe code patching using the algorithm from the paper
+ * 'Practicing JUDO: Java Under Dynamic Optimizations'
+ */
+ /*
+ * First atomically change the the first 2 bytes of the call to a
+ * spinning jump.
+ */
+ ops = 0xfeeb;
+ InterlockedExchange ((gint32*)code, ops);
+
+ /* Then change the other bytes to a nop */
+ code [2] = 0x90;
+ code [3] = 0x90;
+ code [4] = 0x90;
+
+ /* 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 */
+ /* FIXME: the calltree skin trips on the self modifying code above */
- /* Tell valgrind to recompile the patched code */
- VALGRIND_DISCARD_TRANSLATIONS (code, code + 8);
+ /* Tell valgrind to recompile the patched code */
+ //VALGRIND_DISCARD_TRANSLATIONS (code, code + 8);
#endif
- }
- else
- g_assert_not_reached ();
+ }
+ } else if (code [0] == 0x90 || code [0] == 0xeb) {
+ /* Already changed by another thread */
+ ;
+ } else if ((code [-1] == 0xff) && (x86_modrm_reg (code [0]) == 0x2)) {
+ /* call *<OFFSET>(<REG>) -> Call made from AOT code */
+ gpointer *vtable_slot;
+
+ vtable_slot = mono_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]);
+ g_assert_not_reached ();
+ }
}
-static guchar*
-create_trampoline_code (MonoTrampolineType tramp_type)
+void
+mono_arch_nullify_plt_entry (guint8 *code)
{
- guint8 *buf, *code;
- static guint8* generic_jump_trampoline = NULL;
- static guint8 *generic_class_init_trampoline = NULL;
-
- switch (tramp_type) {
- case MONO_TRAMPOLINE_GENERIC:
- if (mono_generic_trampoline_code)
- return mono_generic_trampoline_code;
- break;
- case MONO_TRAMPOLINE_JUMP:
- if (generic_jump_trampoline)
- return generic_jump_trampoline;
- break;
- case MONO_TRAMPOLINE_CLASS_INIT:
- if (generic_class_init_trampoline)
- return generic_class_init_trampoline;
- break;
+ 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, *tramp;
+ int pushed_args, pushed_args_caller_saved;
- code = buf = g_malloc (256);
- /* save caller save regs because we need to do a call */
+ code = buf = mono_global_codeman_reserve (256);
+
+ /* 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
+ * 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_EBX);
- x86_push_reg (buf, X86_EDI);
- x86_push_reg (buf, X86_ESI);
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_JIT) || (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 */
+ pushed_args++;
- if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT)
- x86_call_code (buf, x86_class_init_trampoline);
- else
- x86_call_code (buf, x86_magic_trampoline);
- x86_alu_reg_imm (buf, X86_ADD, X86_ESP, 8*4);
+#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);
- /* restore caller saved regs */
- x86_pop_reg (buf, X86_EBP);
+ pushed_args--;
+
+ /* discard ESP */
x86_pop_reg (buf, X86_ESI);
- x86_pop_reg (buf, X86_EDI);
+ 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);
+ if (!MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type)) {
+ /*
+ * Overwrite the method ptr with the address we need to jump to,
+ * to free %eax.
+ */
+ x86_mov_membase_reg (buf, X86_ESP, pushed_args * sizeof (gpointer), X86_EAX, 4);
+ }
- if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT)
- x86_ret (buf);
- else
- /* call the compiled method */
- x86_jump_reg (buf, X86_EAX);
+ /* 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);
+ if ((tramp_type == MONO_TRAMPOLINE_RESTORE_STACK_PROT) || (tramp_type == MONO_TRAMPOLINE_AOT_PLT))
+ x86_mov_reg_membase (buf, X86_EAX, X86_ESP, (pushed_args - pushed_args_caller_saved + X86_EAX) * 4, 4);
+
+ if (!MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type)) {
+ /* Pop saved reg array + stack align */
+ x86_alu_reg_imm (buf, X86_ADD, X86_ESP, 9 * 4);
+ pushed_args -= 9;
+ g_assert (pushed_args == 0);
+ } else {
+ /* 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);
+ }
+
+ x86_ret (buf);
g_assert ((buf - code) <= 256);
- switch (tramp_type) {
- case MONO_TRAMPOLINE_GENERIC:
- mono_generic_trampoline_code = code;
- break;
- case MONO_TRAMPOLINE_JUMP:
- generic_jump_trampoline = code;
- break;
- case MONO_TRAMPOLINE_CLASS_INIT:
- generic_class_init_trampoline = code;
- break;
+ 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
gpointer
-mono_arch_create_jump_trampoline (MonoMethod *method)
+mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
{
guint8 *code, *buf, *tramp;
-
- if (method->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED)
- return mono_arch_create_jump_trampoline (mono_marshal_get_synchronized_wrapper (method));
-
- /* icalls use method->addr */
- if ((method->iflags & METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL) ||
- (method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL)) {
- MonoMethod *nm;
-
- if (!method->addr && (method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL))
- mono_lookup_pinvoke_call (method);
-
-#ifdef MONO_USE_EXC_TABLES
- if (mono_method_blittable (method)) {
- return method->addr;
- } else {
-#endif
- nm = mono_marshal_get_native_wrapper (method);
- return mono_compile_method (nm);
-#ifdef MONO_USE_EXC_TABLES
- }
-#endif
- }
- tramp = create_trampoline_code (MONO_TRAMPOLINE_JUMP);
+ tramp = mono_get_trampoline_code (tramp_type);
+
+ code = buf = mono_domain_code_reserve_align (domain, TRAMPOLINE_SIZE, 4);
- code = buf = g_malloc (TRAMPOLINE_SIZE);
- x86_push_imm (buf, method);
+ x86_push_imm (buf, arg1);
x86_jump_code (buf, tramp);
g_assert ((buf - code) <= TRAMPOLINE_SIZE);
- mono_jit_stats.method_trampolines++;
+ mono_arch_flush_icache (code, buf - code);
- return code;
+ if (code_len)
+ *code_len = buf - code;
+ 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)
{
- guint8 *code, *buf, *tramp;
+ guint8 *tramp;
+ guint8 *code, *buf;
+ guint8 **rgctx_null_jumps;
+ int tramp_size;
+ int depth, index;
+ int i;
+ gboolean mrgctx;
+
+ 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;
+ }
+
+ tramp_size = 36 + 6 * depth;
+
+ code = buf = mono_global_codeman_reserve (tramp_size);
- /* previously created trampoline code */
- if (method->info)
- return method->info;
+ rgctx_null_jumps = g_malloc (sizeof (guint8*) * (depth + 2));
- /* we immediately compile runtime provided functions */
- if (method->iflags & METHOD_IMPL_ATTRIBUTE_RUNTIME) {
- method->info = mono_compile_method (method);
- return method->info;
+ /* 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);
}
- /* icalls use method->addr */
- if ((method->iflags & METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL) ||
- (method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL)) {
- MonoMethod *nm;
-
- if (!method->addr && (method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL))
- mono_lookup_pinvoke_call (method);
-
-#ifdef MONO_USE_EXC_TABLES
- if (mono_method_blittable (method)) {
- method->info = method->addr;
- } else {
-#endif
- nm = mono_marshal_get_native_wrapper (method);
- method->info = mono_compile_method (nm);
-#ifdef MONO_USE_EXC_TABLES
- }
-#endif
- return method->info;
+ 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);
}
-
- if (method->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED)
- return mono_arch_create_jit_trampoline (mono_marshal_get_synchronized_wrapper (method));
- tramp = create_trampoline_code (MONO_TRAMPOLINE_GENERIC);
+ /* 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);
+
+ for (i = mrgctx ? 1 : 0; i <= depth + 1; ++i)
+ x86_patch (rgctx_null_jumps [i], buf);
+
+ g_free (rgctx_null_jumps);
- code = buf = g_malloc (TRAMPOLINE_SIZE);
- x86_push_imm (buf, method);
+ x86_mov_reg_membase (buf, MONO_ARCH_VTABLE_REG, X86_ESP, 4, 4);
+
+ tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), NULL);
+
+ /* jump to the actual trampoline */
x86_jump_code (buf, tramp);
- g_assert ((buf - code) <= TRAMPOLINE_SIZE);
- /* store trampoline address */
- method->info = code;
+ mono_arch_flush_icache (code, buf - code);
- mono_jit_stats.method_trampolines++;
+ g_assert (buf - code <= tramp_size);
return code;
}
-/**
- * mono_arch_create_class_init_trampoline:
- * @vtable: the type to initialize
+gpointer
+mono_arch_create_generic_class_init_trampoline (void)
+{
+ guint8 *tramp;
+ guint8 *code, *buf;
+ static int byte_offset = -1;
+ static guint8 bitmask;
+ guint8 *jump;
+ int tramp_size;
+
+ tramp_size = 64;
+
+ code = buf = mono_global_codeman_reserve (tramp_size);
+
+ if (byte_offset < 0)
+ mono_marshal_find_bitfield_offset (MonoVTable, initialized, &byte_offset, &bitmask);
+
+ x86_test_membase_imm (code, MONO_ARCH_VTABLE_REG, byte_offset, bitmask);
+ jump = code;
+ x86_branch8 (code, X86_CC_Z, -1, 1);
+
+ x86_ret (code);
+
+ x86_patch (jump, code);
+
+ /* Push the vtable so the stack is the same as in a specific trampoline */
+ x86_push_reg (code, MONO_ARCH_VTABLE_REG);
+
+ tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_GENERIC_CLASS_INIT);
+
+ /* jump to the actual trampoline */
+ x86_jump_code (code, tramp);
+
+ mono_arch_flush_icache (code, code - buf);
+
+ g_assert (code - buf <= tramp_size);
+
+ return buf;
+}
+
+#ifdef MONO_ARCH_MONITOR_OBJECT_REG
+/*
+ * The code produced by this trampoline is equivalent to this:
+ *
+ * if (obj) {
+ * if (obj->synchronisation) {
+ * if (obj->synchronisation->owner == 0) {
+ * if (cmpxch (&obj->synchronisation->owner, TID, 0) == 0)
+ * return;
+ * }
+ * if (obj->synchronisation->owner == TID) {
+ * ++obj->synchronisation->nest;
+ * return;
+ * }
+ * }
+ * }
+ * return full_monitor_enter ();
*
- * 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)
+mono_arch_create_monitor_enter_trampoline (void)
{
- guint8 *code, *buf, *tramp;
+ guint32 code_size;
+ MonoJumpInfo *ji;
- tramp = create_trampoline_code (MONO_TRAMPOLINE_CLASS_INIT);
+ return mono_arch_create_monitor_enter_trampoline_full (&code_size, &ji, FALSE);
+}
- code = buf = g_malloc (TRAMPOLINE_SIZE);
- x86_push_imm (buf, vtable);
- x86_jump_code (buf, tramp);
- g_assert ((buf - code) <= TRAMPOLINE_SIZE);
+gpointer
+mono_arch_create_monitor_enter_trampoline_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
+{
+ guint8 *tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_MONITOR_ENTER);
+ guint8 *code, *buf;
+ guint8 *jump_obj_null, *jump_sync_null, *jump_other_owner, *jump_cmpxchg_failed, *jump_tid;
+ int tramp_size;
+ int owner_offset, nest_offset, dummy;
+
+ g_assert (MONO_ARCH_MONITOR_OBJECT_REG == X86_EAX);
+
+ mono_monitor_threads_sync_members_offset (&owner_offset, &nest_offset, &dummy);
+ g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (owner_offset) == sizeof (gpointer));
+ g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (nest_offset) == sizeof (guint32));
+ owner_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (owner_offset);
+ nest_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (nest_offset);
+
+ tramp_size = 64;
+
+ code = buf = mono_global_codeman_reserve (tramp_size);
+
+ if (mono_thread_get_tls_offset () != -1) {
+ /* MonoObject* obj is in EAX */
+ /* is obj null? */
+ x86_test_reg_reg (buf, X86_EAX, X86_EAX);
+ /* if yes, jump to actual trampoline */
+ jump_obj_null = buf;
+ x86_branch8 (buf, X86_CC_Z, -1, 1);
+
+ /* load obj->synchronization to ECX */
+ x86_mov_reg_membase (buf, X86_ECX, X86_EAX, G_STRUCT_OFFSET (MonoObject, synchronisation), 4);
+ /* is synchronization null? */
+ x86_test_reg_reg (buf, X86_ECX, X86_ECX);
+ /* if yes, jump to actual trampoline */
+ jump_sync_null = buf;
+ x86_branch8 (buf, X86_CC_Z, -1, 1);
+
+ /* load MonoThread* into EDX */
+ buf = mono_x86_emit_tls_get (buf, X86_EDX, mono_thread_get_tls_offset ());
+ /* load TID into EDX */
+ x86_mov_reg_membase (buf, X86_EDX, X86_EDX, G_STRUCT_OFFSET (MonoThread, tid), 4);
+
+ /* is synchronization->owner null? */
+ x86_alu_membase_imm (buf, X86_CMP, X86_ECX, owner_offset, 0);
+ /* if not, jump to next case */
+ jump_tid = buf;
+ x86_branch8 (buf, X86_CC_NZ, -1, 1);
+
+ /* if yes, try a compare-exchange with the TID */
+ /* free up register EAX, needed for the zero */
+ x86_push_reg (buf, X86_EAX);
+ /* zero EAX */
+ x86_alu_reg_reg (buf, X86_XOR, X86_EAX, X86_EAX);
+ /* compare and exchange */
+ x86_prefix (buf, X86_LOCK_PREFIX);
+ x86_cmpxchg_membase_reg (buf, X86_ECX, owner_offset, X86_EDX);
+ /* if not successful, jump to actual trampoline */
+ jump_cmpxchg_failed = buf;
+ x86_branch8 (buf, X86_CC_NZ, -1, 1);
+ /* if successful, pop and return */
+ x86_pop_reg (buf, X86_EAX);
+ x86_ret (buf);
- mono_jit_stats.method_trampolines++;
+ /* next case: synchronization->owner is not null */
+ x86_patch (jump_tid, buf);
+ /* is synchronization->owner == TID? */
+ x86_alu_membase_reg (buf, X86_CMP, X86_ECX, owner_offset, X86_EDX);
+ /* if not, jump to actual trampoline */
+ jump_other_owner = buf;
+ x86_branch8 (buf, X86_CC_NZ, -1, 1);
+ /* if yes, increment nest */
+ x86_inc_membase (buf, X86_ECX, nest_offset);
+ /* return */
+ x86_ret (buf);
+
+ /* push obj */
+ x86_patch (jump_obj_null, buf);
+ x86_patch (jump_sync_null, buf);
+ x86_patch (jump_other_owner, buf);
+ x86_push_reg (buf, X86_EAX);
+ /* jump to the actual trampoline */
+ x86_patch (jump_cmpxchg_failed, buf);
+ x86_jump_code (buf, tramp);
+ } else {
+ /* push obj and jump to the actual trampoline */
+ x86_push_reg (buf, X86_EAX);
+ x86_jump_code (buf, tramp);
+ }
+
+ mono_arch_flush_icache (buf, buf - code);
+ g_assert (buf - code <= tramp_size);
return code;
}
-/*
- * This method is only called when running in the Mono Debugger.
- */
gpointer
-mono_debugger_create_notification_function (gpointer *notification_address)
+mono_arch_create_monitor_exit_trampoline (void)
{
- guint8 *ptr, *buf;
+ guint32 code_size;
+ MonoJumpInfo *ji;
- ptr = buf = g_malloc0 (16);
- x86_breakpoint (buf);
- if (notification_address)
- *notification_address = buf;
- x86_ret (buf);
+ return mono_arch_create_monitor_exit_trampoline_full (&code_size, &ji, FALSE);
+}
+
+gpointer
+mono_arch_create_monitor_exit_trampoline_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
+{
+ guint8 *tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_MONITOR_EXIT);
+ guint8 *code, *buf;
+ guint8 *jump_obj_null, *jump_have_waiters;
+ guint8 *jump_next;
+ int tramp_size;
+ int owner_offset, nest_offset, entry_count_offset;
+
+ g_assert (MONO_ARCH_MONITOR_OBJECT_REG == X86_EAX);
+
+ mono_monitor_threads_sync_members_offset (&owner_offset, &nest_offset, &entry_count_offset);
+ g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (owner_offset) == sizeof (gpointer));
+ g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (nest_offset) == sizeof (guint32));
+ g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (entry_count_offset) == sizeof (gint32));
+ owner_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (owner_offset);
+ nest_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (nest_offset);
+ entry_count_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (entry_count_offset);
+
+ tramp_size = 64;
+
+ code = buf = mono_global_codeman_reserve (tramp_size);
+
+ if (mono_thread_get_tls_offset () != -1) {
+ /* MonoObject* obj is in EAX */
+ /* is obj null? */
+ x86_test_reg_reg (buf, X86_EAX, X86_EAX);
+ /* if yes, jump to actual trampoline */
+ jump_obj_null = buf;
+ x86_branch8 (buf, X86_CC_Z, -1, 1);
+
+ /* load obj->synchronization to ECX */
+ x86_mov_reg_membase (buf, X86_ECX, X86_EAX, G_STRUCT_OFFSET (MonoObject, synchronisation), 4);
+ /* is synchronization null? */
+ x86_test_reg_reg (buf, X86_ECX, X86_ECX);
+ /* if not, jump to next case */
+ jump_next = buf;
+ x86_branch8 (buf, X86_CC_NZ, -1, 1);
+ /* if yes, just return */
+ x86_ret (buf);
+
+ /* next case: synchronization is not null */
+ x86_patch (jump_next, buf);
+ /* load MonoThread* into EDX */
+ buf = mono_x86_emit_tls_get (buf, X86_EDX, mono_thread_get_tls_offset ());
+ /* load TID into EDX */
+ x86_mov_reg_membase (buf, X86_EDX, X86_EDX, G_STRUCT_OFFSET (MonoThread, tid), 4);
+ /* is synchronization->owner == TID */
+ x86_alu_membase_reg (buf, X86_CMP, X86_ECX, owner_offset, X86_EDX);
+ /* if yes, jump to next case */
+ jump_next = buf;
+ x86_branch8 (buf, X86_CC_Z, -1, 1);
+ /* if not, just return */
+ x86_ret (buf);
+
+ /* next case: synchronization->owner == TID */
+ x86_patch (jump_next, buf);
+ /* is synchronization->nest == 1 */
+ x86_alu_membase_imm (buf, X86_CMP, X86_ECX, nest_offset, 1);
+ /* if not, jump to next case */
+ jump_next = buf;
+ x86_branch8 (buf, X86_CC_NZ, -1, 1);
+ /* if yes, is synchronization->entry_count zero? */
+ x86_alu_membase_imm (buf, X86_CMP, X86_ECX, entry_count_offset, 0);
+ /* if not, jump to actual trampoline */
+ jump_have_waiters = buf;
+ x86_branch8 (buf, X86_CC_NZ, -1 , 1);
+ /* if yes, set synchronization->owner to null and return */
+ x86_mov_membase_imm (buf, X86_ECX, owner_offset, 0, 4);
+ x86_ret (buf);
+
+ /* next case: synchronization->nest is not 1 */
+ x86_patch (jump_next, buf);
+ /* decrease synchronization->nest and return */
+ x86_dec_membase (buf, X86_ECX, nest_offset);
+ x86_ret (buf);
+
+ /* push obj and jump to the actual trampoline */
+ x86_patch (jump_obj_null, buf);
+ x86_patch (jump_have_waiters, buf);
+ x86_push_reg (buf, X86_EAX);
+ x86_jump_code (buf, tramp);
+ } else {
+ /* push obj and jump to the actual trampoline */
+ x86_push_reg (buf, X86_EAX);
+ x86_jump_code (buf, tramp);
+ }
- return ptr;
+ mono_arch_flush_icache (buf, buf - code);
+ g_assert (buf - code <= tramp_size);
+
+ return code;
+}
+#else
+gpointer
+mono_arch_create_monitor_enter_trampoline (void)
+{
+ g_assert_not_reached ();
+ return NULL;
}
+gpointer
+mono_arch_create_monitor_exit_trampoline (void)
+{
+ g_assert_not_reached ();
+ return NULL;
+}
+#endif
+
+void
+mono_arch_invalidate_method (MonoJitInfo *ji, void *func, gpointer func_arg)
+{
+ /* FIXME: This is not thread safe */
+ guint8 *code = ji->code_start;
+
+ x86_push_imm (code, func_arg);
+ x86_call_code (code, (guint8*)func);
+}
projects / mono.git / blobdiff