{
/* Patch the jump table entry used by the plt entry */
guint32 offset = ((guint32*)code)[3];
- guint8 *jump_entry = code + offset + 16;
+ guint8 *jump_entry = code + offset + 12;
*(guint8**)jump_entry = addr;
}
void
mono_arch_nullify_class_init_trampoline (guint8 *code, gssize *regs)
{
- return;
+ mono_arch_patch_callsite (NULL, code, nullified_class_init_trampoline);
}
void
* The trampoline contains a pc-relative offset to the got slot where the
* value is stored. The offset can be found at [lr + 4].
*/
+ g_assert (tramp_type != MONO_TRAMPOLINE_GENERIC_CLASS_INIT);
ARM_LDR_IMM (buf, ARMREG_V2, ARMREG_LR, 4);
ARM_LDR_REG_REG (buf, ARMREG_V2, ARMREG_V2, ARMREG_LR);
} else {
- ARM_LDR_IMM (buf, ARMREG_V2, ARMREG_LR, 0);
+ if (tramp_type != MONO_TRAMPOLINE_GENERIC_CLASS_INIT)
+ ARM_LDR_IMM (buf, ARMREG_V2, ARMREG_LR, 0);
+ else
+ ARM_MOV_REG_REG (buf, ARMREG_V2, MONO_ARCH_VTABLE_REG);
}
ARM_LDR_IMM (buf, ARMREG_V3, ARMREG_SP, LR_OFFSET);
*/
ARM_ADD_REG_IMM8 (buf, ARMREG_SP, ARMREG_SP, sizeof (MonoLMF) - sizeof (guint) * 14);
ARM_POP_NWB (buf, 0x5fff);
+ if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
+ ARM_MOV_REG_REG (buf, ARMREG_R0, ARMREG_IP);
/* do we need to set sp? */
ARM_ADD_REG_IMM8 (buf, ARMREG_SP, ARMREG_SP, (14 * 4));
- 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))
ARM_MOV_REG_REG (buf, ARMREG_PC, ARMREG_LR);
else
ARM_MOV_REG_REG (buf, ARMREG_PC, ARMREG_IP);
*code_len = buf - code;
- return buf;
+ return code;
}
#define SPEC_TRAMP_SIZE 24
return code;
}
+#define arm_is_imm12(v) ((int)(v) > -4096 && (int)(v) < 4096)
+
gpointer
-mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 encoded_offset)
+mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot)
{
- /* FIXME: implement! */
- g_assert_not_reached ();
- return NULL;
+ guint8 *tramp;
+ guint8 *code, *buf;
+ int tramp_size;
+ guint32 code_len;
+ guint8 **rgctx_null_jumps;
+ int depth, index;
+ int i, njumps;
+ 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 = 64 + 16 * depth;
+
+ code = buf = mono_global_codeman_reserve (tramp_size);
+
+ 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 (sizeof (MonoMethodRuntimeGenericContext)));
+ ARM_LDR_IMM (code, ARMREG_R1, ARMREG_R1, sizeof (MonoMethodRuntimeGenericContext));
+ } 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);
+ ARM_MOV_REG_REG (code, ARMREG_PC, 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 */
+
+ 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 */
+ ARM_MOV_REG_REG (code, ARMREG_PC, ARMREG_R1);
+ *(guint32*)code = tramp;
+ code += 4;
+
+ mono_arch_flush_icache (buf, code - buf);
+
+ g_assert (code - buf <= tramp_size);
+
+ return buf;
+}
+
+#define arm_is_imm8(v) ((v) > -256 && (v) < 256)
+
+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;
+ guint32 code_len, imm8;
+ gint rot_amount;
+
+ 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);
+
+ 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 */
+ ARM_MOV_REG_REG (code, ARMREG_PC, ARMREG_R1);
+ *(guint32*)code = tramp;
+ code += 4;
+
+ mono_arch_flush_icache (buf, code - buf);
+
+ g_assert (code - buf <= tramp_size);
+
+ return buf;
}
projects / mono.git / blobdiff