* Authors:
* Paolo Molaro (lupus@ximian.com)
*
- * (C) 2001 Ximian, Inc.
+ * (C) 2001-2003 Ximian, Inc.
+ * Copyright 2003-2011 Novell Inc
+ * Copyright 2011 Xamarin Inc
*/
#include <config.h>
#include "mini.h"
#include "mini-arm.h"
-/*
- * Return the instruction to jump from code to target, 0 if not
- * reachable with a single instruction
- */
-static guint32
-branch_for_target_reachable (guint8 *branch, guint8 *target)
-{
- gint diff = target - branch - 8;
- g_assert ((diff & 3) == 0);
- if (diff >= 0) {
- if (diff <= 33554431)
- return (ARMCOND_AL << ARMCOND_SHIFT) | (ARM_BR_TAG) | (diff >> 2);
- } else {
- /* diff between 0 and -33554432 */
- if (diff >= -33554432)
- return (ARMCOND_AL << ARMCOND_SHIFT) | (ARM_BR_TAG) | ((diff >> 2) & ~0xff000000);
- }
- return 0;
-}
-
-/*
- * mono_arch_get_unbox_trampoline:
- * @m: method pointer
- * @addr: pointer to native code for @m
- *
- * when value type methods are called through the vtable we need to unbox the
- * this argument. This method returns a pointer to a trampoline which does
- * unboxing before calling the method
- */
-gpointer
-mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
-{
- guint8 *code, *start;
- int this_pos = 0;
- MonoDomain *domain = mono_domain_get ();
-
- if (MONO_TYPE_ISSTRUCT (mono_method_signature (m)->ret))
- this_pos = 1;
+#define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
- mono_domain_lock (domain);
- start = code = mono_code_manager_reserve (domain->code_mp, 16);
- mono_domain_unlock (domain);
-
- ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 4);
- ARM_ADD_REG_IMM8 (code, this_pos, this_pos, sizeof (MonoObject));
- ARM_MOV_REG_REG (code, ARMREG_PC, ARMREG_IP);
- *(guint32*)code = (guint32)addr;
- code += 4;
- mono_arch_flush_icache (start, code - start);
- g_assert ((code - start) <= 16);
- /*g_print ("unbox trampoline at %d for %s:%s\n", this_pos, m->klass->name, m->name);
- g_print ("unbox code is at %p for method at %p\n", start, addr);*/
-
- return start;
-}
+static guint8* nullified_class_init_trampoline;
void
mono_arch_patch_callsite (guint8 *method_start, guint8 *code_ptr, guint8 *addr)
}
void
-mono_arch_patch_plt_entry (guint8 *code, guint8 *addr)
+mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
{
- guint32 ins = branch_for_target_reachable (code, addr);
+ guint8 *jump_entry;
+
+ /* Patch the jump table entry used by the plt entry */
+ if (*(guint32*)code == 0xe59fc000) {
+ /* ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0); */
+ guint32 offset = ((guint32*)code)[2];
+
+ jump_entry = code + offset + 12;
+ } else if (*(guint16*)(code - 4) == 0xf8df) {
+ /*
+ * Thumb PLT entry, begins with ldr.w ip, [pc, #8], code points to entry + 4, see
+ * mono_arm_get_thumb_plt_entry ().
+ */
+ guint32 offset;
+
+ code -= 4;
+ offset = *(guint32*)(code + 12);
+ jump_entry = code + offset + 8;
+ } else {
+ g_assert_not_reached ();
+ }
- if (ins)
- /* Patch the branch */
- ((guint32*)code) [0] = ins;
- else
- /* Patch the jump address */
- ((guint32*)code) [1] = (guint32)addr;
- mono_arch_flush_icache ((guint8*)code, 4);
+ *(guint8**)jump_entry = addr;
}
void
-mono_arch_nullify_class_init_trampoline (guint8 *code, gssize *regs)
+mono_arch_nullify_class_init_trampoline (guint8 *code, mgreg_t *regs)
{
- return;
+ mono_arch_patch_callsite (NULL, code, nullified_class_init_trampoline);
}
void
-mono_arch_nullify_plt_entry (guint8 *code)
+mono_arch_nullify_plt_entry (guint8 *code, mgreg_t *regs)
{
- guint8 buf [4];
- guint8 *p;
+ if (mono_aot_only && !nullified_class_init_trampoline)
+ nullified_class_init_trampoline = mono_aot_get_trampoline ("nullified_class_init_trampoline");
- p = buf;
- ARM_MOV_REG_REG (p, ARMREG_PC, ARMREG_LR);
+ mono_arch_patch_plt_entry (code, NULL, regs, nullified_class_init_trampoline);
+}
+
+#ifndef DISABLE_JIT
- ((guint32*)code) [0] = ((guint32*)buf) [0];
- mono_arch_flush_icache ((guint8*)code, 4);
+#define arm_is_imm12(v) ((int)(v) > -4096 && (int)(v) < 4096)
+
+/*
+ * Return the instruction to jump from code to target, 0 if not
+ * reachable with a single instruction
+ */
+static guint32
+branch_for_target_reachable (guint8 *branch, guint8 *target)
+{
+ gint diff = target - branch - 8;
+ g_assert ((diff & 3) == 0);
+ if (diff >= 0) {
+ if (diff <= 33554431)
+ return (ARMCOND_AL << ARMCOND_SHIFT) | (ARM_BR_TAG) | (diff >> 2);
+ } else {
+ /* diff between 0 and -33554432 */
+ if (diff >= -33554432)
+ return (ARMCOND_AL << ARMCOND_SHIFT) | (ARM_BR_TAG) | ((diff >> 2) & ~0xff000000);
+ }
+ return 0;
}
+static inline guint8*
+emit_bx (guint8* code, int reg)
+{
+ if (mono_arm_thumb_supported ())
+ ARM_BX (code, reg);
+ else
+ ARM_MOV_REG_REG (code, ARMREG_PC, reg);
+ return code;
+}
/* Stack size for trampoline function
*/
-#define STACK (sizeof (MonoLMF))
+#define STACK ALIGN_TO (sizeof (MonoLMF), 8)
/* Method-specific trampoline code fragment size */
#define METHOD_TRAMPOLINE_SIZE 64
/* Jump-specific trampoline code fragment size */
#define JUMP_TRAMPOLINE_SIZE 64
-#define GEN_TRAMP_SIZE 192
-
-/*
- * Stack frame description when the generic trampoline is called.
- * caller frame
- * ------------------- old sp
- * MonoLMF
- * ------------------- sp
- */
guchar*
-mono_arch_create_trampoline_code (MonoTrampolineType tramp_type)
+mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
{
guint8 *buf, *code = NULL;
guint8 *load_get_lmf_addr, *load_trampoline;
gpointer *constants;
+ int cfa_offset, lmf_offset, regsave_size, lr_offset;
+ GSList *unwind_ops = NULL;
+ MonoJumpInfo *ji = NULL;
+ int buf_len;
/* Now we'll create in 'buf' the ARM trampoline code. This
is the trampoline code common to all methods */
-
- code = buf = mono_global_codeman_reserve (GEN_TRAMP_SIZE);
+
+ buf_len = 212;
+ code = buf = mono_global_codeman_reserve (buf_len);
/*
* At this point lr points to the specific arg and sp points to the saved
* regs on the stack (all but PC and SP). The original LR value has been
* saved as sp + LR_OFFSET by the push in the specific trampoline
*/
-#define LR_OFFSET (sizeof (gpointer) * 13)
- ARM_MOV_REG_REG (buf, ARMREG_V1, ARMREG_SP);
- ARM_LDR_IMM (buf, ARMREG_V2, ARMREG_LR, 0);
- ARM_LDR_IMM (buf, ARMREG_V3, ARMREG_SP, LR_OFFSET);
+
+ /* The offset of lmf inside the stack frame */
+ lmf_offset = STACK - sizeof (MonoLMF);
+ /* The size of the area already allocated by the push in the specific trampoline */
+ regsave_size = 14 * sizeof (mgreg_t);
+ /* The offset where lr was saved inside the regsave area */
+ lr_offset = 13 * sizeof (mgreg_t);
+
+ // FIXME: Finish the unwind info, the current info allows us to unwind
+ // when the trampoline is not in the epilog
+
+ // CFA = SP + (num registers pushed) * 4
+ cfa_offset = 14 * sizeof (mgreg_t);
+ mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, cfa_offset);
+ // PC saved at sp+LR_OFFSET
+ mono_add_unwind_op_offset (unwind_ops, code, buf, ARMREG_LR, -4);
+
+ if (aot && tramp_type != MONO_TRAMPOLINE_GENERIC_CLASS_INIT) {
+ /*
+ * The trampoline contains a pc-relative offset to the got slot
+ * preceeding the got slot where the value is stored. The offset can be
+ * found at [lr + 0].
+ */
+ ARM_LDR_IMM (code, ARMREG_V2, ARMREG_LR, 0);
+ ARM_ADD_REG_IMM (code, ARMREG_V2, ARMREG_V2, 4, 0);
+ ARM_LDR_REG_REG (code, ARMREG_V2, ARMREG_V2, ARMREG_LR);
+ } else {
+ if (tramp_type != MONO_TRAMPOLINE_GENERIC_CLASS_INIT)
+ ARM_LDR_IMM (code, ARMREG_V2, ARMREG_LR, 0);
+ else
+ ARM_MOV_REG_REG (code, ARMREG_V2, MONO_ARCH_VTABLE_REG);
+ }
+ ARM_LDR_IMM (code, ARMREG_V3, ARMREG_SP, lr_offset);
/* ok, now we can continue with the MonoLMF setup, mostly untouched
* from emit_prolog in mini-arm.c
- * This is a sinthetized call to mono_get_lmf_addr ()
+ * This is a synthetized call to mono_get_lmf_addr ()
*/
- load_get_lmf_addr = buf;
- buf += 4;
- ARM_MOV_REG_REG (buf, ARMREG_LR, ARMREG_PC);
- ARM_MOV_REG_REG (buf, ARMREG_PC, ARMREG_R0);
+ if (aot) {
+ ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_get_lmf_addr");
+ ARM_LDR_IMM (code, ARMREG_R0, ARMREG_PC, 0);
+ ARM_B (code, 0);
+ *(gpointer*)code = NULL;
+ code += 4;
+ ARM_LDR_REG_REG (code, ARMREG_R0, ARMREG_PC, ARMREG_R0);
+ } else {
+ load_get_lmf_addr = code;
+ code += 4;
+ }
+ ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
+ code = emit_bx (code, ARMREG_R0);
/* we build the MonoLMF structure on the stack - see mini-arm.h
* The pointer to the struct is put in r1.
* the iregs array is already allocated on the stack by push.
*/
- ARM_SUB_REG_IMM8 (buf, ARMREG_SP, ARMREG_SP, sizeof (MonoLMF) - sizeof (guint) * 14);
- ARM_ADD_REG_IMM8 (buf, ARMREG_R1, ARMREG_SP, STACK - sizeof (MonoLMF));
+ ARM_SUB_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, STACK - regsave_size);
+ cfa_offset += STACK - regsave_size;
+ mono_add_unwind_op_def_cfa_offset (unwind_ops, code, buf, cfa_offset);
+ /* V1 == lmf */
+ ARM_ADD_REG_IMM8 (code, ARMREG_V1, ARMREG_SP, STACK - sizeof (MonoLMF));
+
+ /*
+ * The stack now looks like:
+ * <saved regs>
+ * v1 -> <rest of LMF>
+ * sp -> <alignment>
+ */
+
/* r0 is the result from mono_get_lmf_addr () */
- ARM_STR_IMM (buf, ARMREG_R0, ARMREG_R1, G_STRUCT_OFFSET (MonoLMF, lmf_addr));
+ ARM_STR_IMM (code, ARMREG_R0, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, lmf_addr));
/* new_lmf->previous_lmf = *lmf_addr */
- ARM_LDR_IMM (buf, ARMREG_R2, ARMREG_R0, G_STRUCT_OFFSET (MonoLMF, previous_lmf));
- ARM_STR_IMM (buf, ARMREG_R2, ARMREG_R1, G_STRUCT_OFFSET (MonoLMF, previous_lmf));
+ ARM_LDR_IMM (code, ARMREG_R2, ARMREG_R0, G_STRUCT_OFFSET (MonoLMF, previous_lmf));
+ ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, previous_lmf));
/* *(lmf_addr) = r1 */
- ARM_STR_IMM (buf, ARMREG_R1, ARMREG_R0, G_STRUCT_OFFSET (MonoLMF, previous_lmf));
+ ARM_STR_IMM (code, ARMREG_V1, ARMREG_R0, G_STRUCT_OFFSET (MonoLMF, previous_lmf));
/* save method info (it's in v2) */
- if ((tramp_type == MONO_TRAMPOLINE_GENERIC) || (tramp_type == MONO_TRAMPOLINE_JUMP))
- ARM_STR_IMM (buf, ARMREG_V2, ARMREG_R1, G_STRUCT_OFFSET (MonoLMF, method));
- ARM_STR_IMM (buf, ARMREG_SP, ARMREG_R1, G_STRUCT_OFFSET (MonoLMF, ebp));
+ if ((tramp_type == MONO_TRAMPOLINE_JIT) || (tramp_type == MONO_TRAMPOLINE_JUMP))
+ ARM_STR_IMM (code, ARMREG_V2, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, method));
+ else {
+ ARM_MOV_REG_IMM8 (code, ARMREG_R2, 0);
+ ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, method));
+ }
+ /* save caller SP */
+ ARM_ADD_REG_IMM8 (code, ARMREG_R2, ARMREG_SP, cfa_offset);
+ ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, sp));
+ /* save caller FP */
+ ARM_LDR_IMM (code, ARMREG_R2, ARMREG_V1, (G_STRUCT_OFFSET (MonoLMF, iregs) + ARMREG_FP*4));
+ ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, fp));
/* save the IP (caller ip) */
if (tramp_type == MONO_TRAMPOLINE_JUMP) {
- ARM_MOV_REG_IMM8 (buf, ARMREG_R2, 0);
+ ARM_MOV_REG_IMM8 (code, ARMREG_R2, 0);
} else {
- /* assumes STACK == sizeof (MonoLMF) */
- ARM_LDR_IMM (buf, ARMREG_R2, ARMREG_SP, (G_STRUCT_OFFSET (MonoLMF, iregs) + 13*4));
+ ARM_LDR_IMM (code, ARMREG_R2, ARMREG_V1, (G_STRUCT_OFFSET (MonoLMF, iregs) + 13*4));
}
- ARM_STR_IMM (buf, ARMREG_R2, ARMREG_R1, G_STRUCT_OFFSET (MonoLMF, eip));
+ ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, ip));
/*
* Now we're ready to call xxx_trampoline ().
*/
- /* Arg 1: the saved registers. It was put in v1 */
- ARM_MOV_REG_REG (buf, ARMREG_R0, ARMREG_V1);
+ /* Arg 1: the saved registers */
+ ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, iregs));
/* Arg 2: code (next address to the instruction that called us) */
if (tramp_type == MONO_TRAMPOLINE_JUMP) {
- ARM_MOV_REG_IMM8 (buf, ARMREG_R1, 0);
+ ARM_MOV_REG_IMM8 (code, ARMREG_R1, 0);
} else {
- ARM_MOV_REG_REG (buf, ARMREG_R1, ARMREG_V3);
+ ARM_MOV_REG_REG (code, ARMREG_R1, ARMREG_V3);
}
/* Arg 3: the specific argument, stored in v2
*/
- ARM_MOV_REG_REG (buf, ARMREG_R2, ARMREG_V2);
+ ARM_MOV_REG_REG (code, ARMREG_R2, ARMREG_V2);
+
+ if (aot) {
+ char *icall_name = g_strdup_printf ("trampoline_func_%d", tramp_type);
+ ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, icall_name);
+ ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
+ ARM_B (code, 0);
+ *(gpointer*)code = NULL;
+ code += 4;
+ ARM_LDR_REG_REG (code, ARMREG_IP, ARMREG_PC, ARMREG_IP);
+ } else {
+ load_trampoline = code;
+ code += 4;
+ }
- load_trampoline = buf;
- buf += 4;
+ ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
+ code = emit_bx (code, ARMREG_IP);
- ARM_MOV_REG_REG (buf, ARMREG_LR, ARMREG_PC);
- ARM_MOV_REG_REG (buf, ARMREG_PC, ARMREG_IP);
-
/* OK, code address is now on r0. Move it to the place on the stack
* where IP was saved (it is now no more useful to us and it can be
* clobbered). This way we can just restore all the regs in one inst
* and branch to IP.
*/
- ARM_STR_IMM (buf, ARMREG_R0, ARMREG_V1, (ARMREG_R12 * 4));
+ ARM_STR_IMM (code, ARMREG_R0, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, iregs) + (ARMREG_R12 * sizeof (mgreg_t)));
/* Check for thread interruption */
/* This is not perf critical code so no need to check the interrupt flag */
/*
* Have to call the _force_ variant, since there could be a protected wrapper on the top of the stack.
*/
- ARM_LDR_IMM (buf, ARMREG_IP, ARMREG_PC, 0);
- ARM_B (buf, 0);
- *(gpointer*)buf = mono_thread_force_interruption_checkpoint;
- buf += 4;
- ARM_MOV_REG_REG (buf, ARMREG_LR, ARMREG_PC);
- ARM_MOV_REG_REG (buf, ARMREG_PC, ARMREG_IP);
+ if (aot) {
+ ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_force_interruption_checkpoint");
+ ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
+ ARM_B (code, 0);
+ *(gpointer*)code = NULL;
+ code += 4;
+ ARM_LDR_REG_REG (code, ARMREG_IP, ARMREG_PC, ARMREG_IP);
+ } else {
+ ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
+ ARM_B (code, 0);
+ *(gpointer*)code = mono_thread_force_interruption_checkpoint;
+ code += 4;
+ }
+ ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
+ code = emit_bx (code, ARMREG_IP);
/*
* Now we restore the MonoLMF (see emit_epilogue in mini-arm.c)
* and the rest of the registers, so the method called will see
* the same state as before we executed.
- * The pointer to MonoLMF is in r2.
*/
- ARM_MOV_REG_REG (buf, ARMREG_R2, ARMREG_SP);
/* ip = previous_lmf */
- ARM_LDR_IMM (buf, ARMREG_IP, ARMREG_R2, G_STRUCT_OFFSET (MonoLMF, previous_lmf));
+ ARM_LDR_IMM (code, ARMREG_IP, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, previous_lmf));
/* lr = lmf_addr */
- ARM_LDR_IMM (buf, ARMREG_LR, ARMREG_R2, G_STRUCT_OFFSET (MonoLMF, lmf_addr));
+ ARM_LDR_IMM (code, ARMREG_LR, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, lmf_addr));
/* *(lmf_addr) = previous_lmf */
- ARM_STR_IMM (buf, ARMREG_IP, ARMREG_LR, G_STRUCT_OFFSET (MonoLMF, previous_lmf));
+ ARM_STR_IMM (code, ARMREG_IP, ARMREG_LR, G_STRUCT_OFFSET (MonoLMF, previous_lmf));
/* Non-standard function epilogue. Instead of doing a proper
* return, we just jump to the compiled code.
/* Restore the registers and jump to the code:
* Note that IP has been conveniently set to the method addr.
*/
- ARM_ADD_REG_IMM8 (buf, ARMREG_SP, ARMREG_SP, sizeof (MonoLMF) - sizeof (guint) * 14);
- ARM_POP_NWB (buf, 0x5fff);
- /* do we need to set sp? */
- ARM_ADD_REG_IMM8 (buf, ARMREG_SP, ARMREG_SP, (14 * 4));
- if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT)
- ARM_MOV_REG_REG (buf, ARMREG_PC, ARMREG_LR);
+ ARM_ADD_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, STACK - regsave_size);
+ ARM_POP_NWB (code, 0x5fff);
+ if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
+ ARM_MOV_REG_REG (code, ARMREG_R0, ARMREG_IP);
+ ARM_ADD_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, regsave_size);
+ if ((tramp_type == MONO_TRAMPOLINE_CLASS_INIT) || (tramp_type == MONO_TRAMPOLINE_GENERIC_CLASS_INIT) || (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH))
+ code = emit_bx (code, ARMREG_LR);
else
- ARM_MOV_REG_REG (buf, ARMREG_PC, ARMREG_IP);
+ code = emit_bx (code, ARMREG_IP);
- constants = (gpointer*)buf;
+ constants = (gpointer*)code;
constants [0] = mono_get_lmf_addr;
constants [1] = (gpointer)mono_get_trampoline_func (tramp_type);
- /* backpatch by emitting the missing instructions skipped above */
- ARM_LDR_IMM (load_get_lmf_addr, ARMREG_R0, ARMREG_PC, (buf - load_get_lmf_addr - 8));
- ARM_LDR_IMM (load_trampoline, ARMREG_IP, ARMREG_PC, (buf + 4 - load_trampoline - 8));
+ if (!aot) {
+ /* backpatch by emitting the missing instructions skipped above */
+ ARM_LDR_IMM (load_get_lmf_addr, ARMREG_R0, ARMREG_PC, (code - load_get_lmf_addr - 8));
+ ARM_LDR_IMM (load_trampoline, ARMREG_IP, ARMREG_PC, (code + 4 - load_trampoline - 8));
+ }
- buf += 8;
+ code += 8;
/* Flush instruction cache, since we've generated code */
- mono_arch_flush_icache (code, buf - code);
+ mono_arch_flush_icache (buf, code - buf);
/* Sanity check */
- g_assert ((buf - code) <= GEN_TRAMP_SIZE);
+ g_assert ((code - buf) <= buf_len);
- return code;
+ if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT)
+ /* Initialize the nullified class init trampoline used in the AOT case */
+ nullified_class_init_trampoline = mono_arch_get_nullified_class_init_trampoline (NULL);
+
+ if (info)
+ *info = mono_tramp_info_create (mono_get_generic_trampoline_name (tramp_type), buf, code - buf, ji, unwind_ops);
+
+ return buf;
+}
+
+gpointer
+mono_arch_get_nullified_class_init_trampoline (MonoTrampInfo **info)
+{
+ guint8 *buf, *code;
+
+ code = buf = mono_global_codeman_reserve (16);
+
+ code = emit_bx (code, ARMREG_LR);
+
+ mono_arch_flush_icache (buf, code - buf);
+
+ if (info)
+ *info = mono_tramp_info_create (g_strdup_printf ("nullified_class_init_trampoline"), buf, code - buf, NULL, NULL);
+
+ return buf;
}
#define SPEC_TRAMP_SIZE 24
tramp = mono_get_trampoline_code (tramp_type);
mono_domain_lock (domain);
- code = buf = mono_code_manager_reserve_align (domain->code_mp, size, 4);
- if ((short_branch = branch_for_target_reachable (code + 8, tramp))) {
+ code = buf = mono_domain_code_reserve_align (domain, size, 4);
+ if ((short_branch = branch_for_target_reachable (code + 4, tramp))) {
size = 12;
- mono_code_manager_commit (domain->code_mp, code, SPEC_TRAMP_SIZE, size);
+ mono_domain_code_commit (domain, code, SPEC_TRAMP_SIZE, size);
}
mono_domain_unlock (domain);
* tramp-literal
*/
/* We save all the registers, except PC and SP */
- ARM_PUSH (buf, 0x5fff);
+ ARM_PUSH (code, 0x5fff);
if (short_branch) {
- constants = (gpointer*)buf;
+ constants = (gpointer*)code;
constants [0] = GUINT_TO_POINTER (short_branch | (1 << 24));
constants [1] = arg1;
- buf += 8;
+ code += 8;
} else {
- ARM_LDR_IMM (buf, ARMREG_R1, ARMREG_PC, 8); /* temp reg */
- ARM_MOV_REG_REG (buf, ARMREG_LR, ARMREG_PC);
- ARM_MOV_REG_REG (buf, ARMREG_PC, ARMREG_R1);
+ ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 8); /* temp reg */
+ ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
+ code = emit_bx (code, ARMREG_R1);
- constants = (gpointer*)buf;
+ constants = (gpointer*)code;
constants [0] = arg1;
constants [1] = tramp;
- buf += 8;
+ code += 8;
}
/* Flush instruction cache, since we've generated code */
- mono_arch_flush_icache (code, buf - code);
+ mono_arch_flush_icache (buf, code - buf);
- g_assert ((buf - code) <= size);
+ g_assert ((code - buf) <= size);
if (code_len)
- *code_len = buf - code;
+ *code_len = code - buf;
- return code;
+ return buf;
+}
+
+/*
+ * mono_arch_get_unbox_trampoline:
+ * @m: method pointer
+ * @addr: pointer to native code for @m
+ *
+ * when value type methods are called through the vtable we need to unbox the
+ * this argument. This method returns a pointer to a trampoline which does
+ * unboxing before calling the method
+ */
+gpointer
+mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
+{
+ guint8 *code, *start;
+ MonoDomain *domain = mono_domain_get ();
+
+ start = code = mono_domain_code_reserve (domain, 16);
+
+ ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 4);
+ ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_R0, sizeof (MonoObject));
+ code = emit_bx (code, ARMREG_IP);
+ *(guint32*)code = (guint32)addr;
+ code += 4;
+ mono_arch_flush_icache (start, code - start);
+ g_assert ((code - start) <= 16);
+ /*g_print ("unbox trampoline at %d for %s:%s\n", this_pos, m->klass->name, m->name);
+ g_print ("unbox code is at %p for method at %p\n", start, addr);*/
+
+ return start;
+}
+
+gpointer
+mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
+{
+ guint8 *code, *start;
+ int buf_len;
+
+ MonoDomain *domain = mono_domain_get ();
+
+ buf_len = 16;
+
+ start = code = mono_domain_code_reserve (domain, buf_len);
+
+ ARM_LDR_IMM (code, MONO_ARCH_RGCTX_REG, ARMREG_PC, 0);
+ ARM_LDR_IMM (code, ARMREG_PC, ARMREG_PC, 0);
+ *(guint32*)code = (guint32)mrgctx;
+ code += 4;
+ *(guint32*)code = (guint32)addr;
+ code += 4;
+
+ g_assert ((code - start) <= buf_len);
+
+ mono_arch_flush_icache (start, code - start);
+
+ return start;
+}
+
+gpointer
+mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
+{
+ guint8 *tramp;
+ guint8 *code, *buf;
+ int tramp_size;
+ guint32 code_len;
+ guint8 **rgctx_null_jumps;
+ int depth, index;
+ int i, njumps;
+ gboolean mrgctx;
+ MonoJumpInfo *ji = NULL;
+ GSList *unwind_ops = NULL;
+
+ mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
+ index = MONO_RGCTX_SLOT_INDEX (slot);
+ if (mrgctx)
+ index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / 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 = 64 + 16 * depth;
+
+ code = buf = mono_global_codeman_reserve (tramp_size);
+
+ mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, 0);
+
+ rgctx_null_jumps = g_malloc (sizeof (guint8*) * (depth + 2));
+ njumps = 0;
+
+ /* The vtable/mrgctx is in R0 */
+ g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
+
+ if (mrgctx) {
+ /* get mrgctx ptr */
+ ARM_MOV_REG_REG (code, ARMREG_R1, ARMREG_R0);
+ } else {
+ /* load rgctx ptr from vtable */
+ g_assert (arm_is_imm12 (G_STRUCT_OFFSET (MonoVTable, runtime_generic_context)));
+ ARM_LDR_IMM (code, ARMREG_R1, ARMREG_R0, G_STRUCT_OFFSET (MonoVTable, runtime_generic_context));
+ /* is the rgctx ptr null? */
+ ARM_CMP_REG_IMM (code, ARMREG_R1, 0, 0);
+ /* if yes, jump to actual trampoline */
+ rgctx_null_jumps [njumps ++] = code;
+ ARM_B_COND (code, ARMCOND_EQ, 0);
+ }
+
+ for (i = 0; i < depth; ++i) {
+ /* load ptr to next array */
+ if (mrgctx && i == 0) {
+ g_assert (arm_is_imm12 (MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT));
+ ARM_LDR_IMM (code, ARMREG_R1, ARMREG_R1, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT);
+ } else {
+ ARM_LDR_IMM (code, ARMREG_R1, ARMREG_R1, 0);
+ }
+ /* is the ptr null? */
+ ARM_CMP_REG_IMM (code, ARMREG_R1, 0, 0);
+ /* if yes, jump to actual trampoline */
+ rgctx_null_jumps [njumps ++] = code;
+ ARM_B_COND (code, ARMCOND_EQ, 0);
+ }
+
+ /* fetch slot */
+ code = mono_arm_emit_load_imm (code, ARMREG_R2, sizeof (gpointer) * (index + 1));
+ ARM_LDR_REG_REG (code, ARMREG_R1, ARMREG_R1, ARMREG_R2);
+ /* is the slot null? */
+ ARM_CMP_REG_IMM (code, ARMREG_R1, 0, 0);
+ /* if yes, jump to actual trampoline */
+ rgctx_null_jumps [njumps ++] = code;
+ ARM_B_COND (code, ARMCOND_EQ, 0);
+ /* otherwise return, result is in R1 */
+ ARM_MOV_REG_REG (code, ARMREG_R0, ARMREG_R1);
+ code = emit_bx (code, ARMREG_LR);
+
+ g_assert (njumps <= depth + 2);
+ for (i = 0; i < njumps; ++i)
+ arm_patch (rgctx_null_jumps [i], code);
+
+ g_free (rgctx_null_jumps);
+
+ /* Slowpath */
+
+ /* The vtable/mrgctx is still in R0 */
+
+ if (aot) {
+ ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("specific_trampoline_lazy_fetch_%u", slot));
+ ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 0);
+ ARM_B (code, 0);
+ *(gpointer*)code = NULL;
+ code += 4;
+ ARM_LDR_REG_REG (code, ARMREG_PC, ARMREG_PC, ARMREG_R1);
+ } else {
+ tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), &code_len);
+
+ /* Jump to the actual trampoline */
+ ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 0); /* temp reg */
+ code = emit_bx (code, ARMREG_R1);
+ *(gpointer*)code = tramp;
+ code += 4;
+ }
+
+ mono_arch_flush_icache (buf, code - buf);
+
+ g_assert (code - buf <= tramp_size);
+
+ if (info)
+ *info = mono_tramp_info_create (mono_get_rgctx_fetch_trampoline_name (slot), buf, code - buf, ji, unwind_ops);
+
+ return buf;
+}
+
+#define arm_is_imm8(v) ((v) > -256 && (v) < 256)
+
+gpointer
+mono_arch_create_generic_class_init_trampoline (MonoTrampInfo **info, gboolean aot)
+{
+ guint8 *tramp;
+ guint8 *code, *buf;
+ static int byte_offset = -1;
+ static guint8 bitmask;
+ guint8 *jump;
+ int tramp_size;
+ guint32 code_len, imm8;
+ gint rot_amount;
+ GSList *unwind_ops = NULL;
+ MonoJumpInfo *ji = NULL;
+
+ 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);
+
+ g_assert (arm_is_imm8 (byte_offset));
+ ARM_LDRSB_IMM (code, ARMREG_IP, MONO_ARCH_VTABLE_REG, byte_offset);
+ imm8 = mono_arm_is_rotated_imm8 (bitmask, &rot_amount);
+ g_assert (imm8 >= 0);
+ ARM_AND_REG_IMM (code, ARMREG_IP, ARMREG_IP, imm8, rot_amount);
+ ARM_CMP_REG_IMM (code, ARMREG_IP, 0, 0);
+ jump = code;
+ ARM_B_COND (code, ARMCOND_EQ, 0);
+
+ /* Initialized case */
+ ARM_MOV_REG_REG (code, ARMREG_PC, ARMREG_LR);
+
+ /* Uninitialized case */
+ arm_patch (jump, code);
+
+ if (aot) {
+ ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, "specific_trampoline_generic_class_init");
+ ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 0);
+ ARM_B (code, 0);
+ *(gpointer*)code = NULL;
+ code += 4;
+ ARM_LDR_REG_REG (code, ARMREG_PC, ARMREG_PC, ARMREG_R1);
+ } else {
+ tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_GENERIC_CLASS_INIT, mono_get_root_domain (), &code_len);
+
+ /* Jump to the actual trampoline */
+ ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 0); /* temp reg */
+ code = emit_bx (code, ARMREG_R1);
+ *(gpointer*)code = tramp;
+ code += 4;
+ }
+
+ mono_arch_flush_icache (buf, code - buf);
+
+ g_assert (code - buf <= tramp_size);
+
+ if (info)
+ *info = mono_tramp_info_create (g_strdup_printf ("generic_class_init_trampoline"), buf, code - buf, ji, unwind_ops);
+
+ return buf;
+}
+
+#else
+
+guchar*
+mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
+{
+ g_assert_not_reached ();
+ return NULL;
}
gpointer
-mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 encoded_offset)
+mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
{
- /* FIXME: implement! */
g_assert_not_reached ();
return NULL;
}
-guint32
-mono_arch_get_rgctx_lazy_fetch_offset (gpointer *regs)
+gpointer
+mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
{
- /* FIXME: implement! */
g_assert_not_reached ();
- return 0;
+ return NULL;
+}
+
+gpointer
+mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
+{
+ g_assert_not_reached ();
+ return NULL;
+}
+
+gpointer
+mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
+{
+ g_assert_not_reached ();
+ return NULL;
+}
+
+gpointer
+mono_arch_create_generic_class_init_trampoline (MonoTrampInfo **info, gboolean aot)
+{
+ g_assert_not_reached ();
+ return NULL;
+}
+
+#endif /* DISABLE_JIT */
+
+guint8*
+mono_arch_get_call_target (guint8 *code)
+{
+ guint32 ins = ((guint32*)(gpointer)code) [-1];
+
+#if MONOTOUCH
+ /* Should be a 'bl' or a 'b' */
+ if (((ins >> 25) & 0x7) == 0x5) {
+#else
+ /* Should be a 'bl' */
+ if ((((ins >> 25) & 0x7) == 0x5) && (((ins >> 24) & 0x1) == 0x1)) {
+#endif
+ gint32 disp = ((gint32)ins) & 0xffffff;
+ guint8 *target = code - 4 + 8 + (disp * 4);
+
+ return target;
+ } else {
+ return NULL;
+ }
+}
+
+guint32
+mono_arch_get_plt_info_offset (guint8 *plt_entry, mgreg_t *regs, guint8 *code)
+{
+ /* The offset is stored as the 4th word of the plt entry */
+ return ((guint32*)plt_entry) [3];
+}
+
+/*
+ * Return the address of the PLT entry called by the thumb code CODE.
+ */
+guint8*
+mono_arm_get_thumb_plt_entry (guint8 *code)
+{
+ int s, j1, j2, imm10, imm11, i1, i2, imm32;
+ guint8 *bl, *base;
+ guint16 t1, t2;
+ guint8 *target;
+
+ /* code should be right after a BL */
+ code = (guint8*)((mgreg_t)code & ~1);
+ base = (guint8*)((mgreg_t)code & ~3);
+ bl = code - 4;
+ t1 = ((guint16*)bl) [0];
+ t2 = ((guint16*)bl) [1];
+
+ g_assert ((t1 >> 11) == 0x1e);
+
+ s = (t1 >> 10) & 0x1;
+ imm10 = (t1 >> 0) & 0x3ff;
+ j1 = (t2 >> 13) & 0x1;
+ j2 = (t2 >> 11) & 0x1;
+ imm11 = t2 & 0x7ff;
+
+ i1 = (s ^ j1) ? 0 : 1;
+ i2 = (s ^ j2) ? 0 : 1;
+
+ imm32 = (imm11 << 1) | (imm10 << 12) | (i2 << 22) | (i1 << 23);
+ // FIXME:
+ g_assert (s == 0);
+
+ target = code + imm32;
+
+ /* target now points to the thumb plt entry */
+ /* ldr.w r12, [pc, #8] */
+ g_assert (((guint16*)target) [0] == 0xf8df);
+ g_assert (((guint16*)target) [1] == 0xc008);
+
+ /*
+ * The PLT info offset is at offset 16, but mono_arch_get_plt_entry_offset () returns
+ * the 3rd word, so compensate by returning a different value.
+ */
+ target += 4;
+
+ return target;
}
projects / mono.git / blobdiff