[ppc64le] Implementation of mono_arch_get_delegate_virtual_invoke_imp…

…l method for ppc64le architecture (#77308)

* [ppc64le] Fixed thunk address 8 byte alignment issue

* Fixed FSharp crash issue

* [ppc64le] Implementation of mono_arch_get_delegate_virtual_invoke_impl method for ppc64le architecture

src/mono/mono/mini/mini-ppc.c

@@ -470,10 +470,54 @@ mono_arch_get_delegate_invoke_impl (MonoMethodSignature *sig, gboolean has_targe
  return start;
 }
 
+/**
+ *
+ * @brief Architecture-specific delegation virtual trampoline processing
+ *
+ * @param[in] @sig - Method signature
+ * @param[in] @method - Method
+ * @param[in] @offset - Offset into vtable
+ * @param[in] @load_imt_reg - Whether to load the LMT register
+ * @returns Trampoline
+ *
+ * Return a pointer to a delegation virtual trampoline
+ */
+
 gpointer
 mono_arch_get_delegate_virtual_invoke_impl (MonoMethodSignature *sig, MonoMethod *method, int offset, gboolean load_imt_reg)
 {
- return NULL;
+ guint8 *code, *start;
+ int size = 32;
+
+ start = code = (guint8 *) mono_global_codeman_reserve (size);
+
+ /*
+ * Replace the "this" argument with the target
+ */
+ ppc_mr (code, ppc_r12, ppc_r3);
+ ppc_ldptr (code, ppc_r3, MONO_STRUCT_OFFSET(MonoDelegate, target), ppc_r12);
+
+ /*
+ * Load the IMT register, if needed
+ */
+ if (load_imt_reg) {
+ ppc_ldptr (code, MONO_ARCH_IMT_REG, MONO_STRUCT_OFFSET(MonoDelegate, method), ppc_r12);
+ }
+
+ /*
+ * Load the vTable
+ */
+ ppc_ldptr (code, ppc_r12, MONO_STRUCT_OFFSET(MonoObject, vtable), ppc_r3);
+ if (!ppc_is_imm16(offset))
+ ppc_addis (code, ppc_r12, ppc_r12, ppc_ha(offset));
+ ppc_ldptr (code, ppc_r12, offset, ppc_r12);
+ ppc_mtctr (code, ppc_r12);
+ ppc_bcctr (code, PPC_BR_ALWAYS, 0);
+
+ mono_arch_flush_icache (start, code - start);
+ MONO_PROFILER_RAISE (jit_code_buffer, (start, code - start, MONO_PROFILER_CODE_BUFFER_DELEGATE_INVOKE, NULL));
+
+ return(start);
 }
 
 gpointer