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-rw-r--r--xpcom/reflect/xptcall/md/unix/xptcinvoke_aarch64.cpp140
1 files changed, 140 insertions, 0 deletions
diff --git a/xpcom/reflect/xptcall/md/unix/xptcinvoke_aarch64.cpp b/xpcom/reflect/xptcall/md/unix/xptcinvoke_aarch64.cpp
new file mode 100644
index 000000000..e5807dbcd
--- /dev/null
+++ b/xpcom/reflect/xptcall/md/unix/xptcinvoke_aarch64.cpp
@@ -0,0 +1,140 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Platform specific code to invoke XPCOM methods on native objects */
+
+#include "xptcprivate.h"
+
+#if !defined(__aarch64__)
+#error "This code is for Linux AArch64 only."
+#endif
+
+
+/* "Procedure Call Standard for the ARM 64-bit Architecture" document, sections
+ * "5.4 Parameter Passing" and "6.1.2 Procedure Calling" contain all the
+ * needed information.
+ *
+ * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042d/IHI0042D_aapcs.pdf
+ */
+
+#ifndef __AARCH64EL__
+#error "Only little endian compatibility was tested"
+#endif
+
+/*
+ * Allocation of integer function arguments initially to registers r1-r7
+ * and then to stack. Handling of 'that' argument which goes to register r0
+ * is handled separately and does not belong here.
+ *
+ * 'ireg_args' - pointer to the current position in the buffer,
+ * corresponding to the register arguments
+ * 'stack_args' - pointer to the current position in the buffer,
+ * corresponding to the arguments on stack
+ * 'end' - pointer to the end of the registers argument
+ * buffer.
+ */
+static inline void alloc_word(uint64_t* &ireg_args,
+ uint64_t* &stack_args,
+ uint64_t* end,
+ uint64_t data)
+{
+ if (ireg_args < end) {
+ *ireg_args = data;
+ ireg_args++;
+ } else {
+ *stack_args = data;
+ stack_args++;
+ }
+}
+
+static inline void alloc_double(double* &freg_args,
+ uint64_t* &stack_args,
+ double* end,
+ double data)
+{
+ if (freg_args < end) {
+ *freg_args = data;
+ freg_args++;
+ } else {
+ memcpy(stack_args, &data, sizeof(data));
+ stack_args++;
+ }
+}
+
+static inline void alloc_float(double* &freg_args,
+ uint64_t* &stack_args,
+ double* end,
+ float data)
+{
+ if (freg_args < end) {
+ memcpy(freg_args, &data, sizeof(data));
+ freg_args++;
+ } else {
+ memcpy(stack_args, &data, sizeof(data));
+ stack_args++;
+ }
+}
+
+
+extern "C" void
+invoke_copy_to_stack(uint64_t* stk, uint64_t *end,
+ uint32_t paramCount, nsXPTCVariant* s)
+{
+ uint64_t *ireg_args = stk;
+ uint64_t *ireg_end = ireg_args + 8;
+ double *freg_args = (double *)ireg_end;
+ double *freg_end = freg_args + 8;
+ uint64_t *stack_args = (uint64_t *)freg_end;
+
+ // leave room for 'that' argument in x0
+ ++ireg_args;
+
+ for (uint32_t i = 0; i < paramCount; i++, s++) {
+ uint64_t word;
+
+ if (s->IsPtrData()) {
+ word = (uint64_t)s->ptr;
+ } else {
+ // According to the ABI, integral types that are smaller than 8
+ // bytes are to be passed in 8-byte registers or 8-byte stack
+ // slots.
+ switch (s->type) {
+ case nsXPTType::T_FLOAT:
+ alloc_float(freg_args, stack_args, freg_end, s->val.f);
+ continue;
+ case nsXPTType::T_DOUBLE:
+ alloc_double(freg_args, stack_args, freg_end, s->val.d);
+ continue;
+ case nsXPTType::T_I8: word = s->val.i8; break;
+ case nsXPTType::T_I16: word = s->val.i16; break;
+ case nsXPTType::T_I32: word = s->val.i32; break;
+ case nsXPTType::T_I64: word = s->val.i64; break;
+ case nsXPTType::T_U8: word = s->val.u8; break;
+ case nsXPTType::T_U16: word = s->val.u16; break;
+ case nsXPTType::T_U32: word = s->val.u32; break;
+ case nsXPTType::T_U64: word = s->val.u64; break;
+ case nsXPTType::T_BOOL: word = s->val.b; break;
+ case nsXPTType::T_CHAR: word = s->val.c; break;
+ case nsXPTType::T_WCHAR: word = s->val.wc; break;
+ default:
+ // all the others are plain pointer types
+ word = reinterpret_cast<uint64_t>(s->val.p);
+ break;
+ }
+ }
+
+ alloc_word(ireg_args, stack_args, ireg_end, word);
+ }
+}
+
+extern "C" nsresult _NS_InvokeByIndex(nsISupports* that, uint32_t methodIndex,
+ uint32_t paramCount, nsXPTCVariant* params);
+
+EXPORT_XPCOM_API(nsresult)
+NS_InvokeByIndex(nsISupports* that, uint32_t methodIndex,
+ uint32_t paramCount, nsXPTCVariant* params)
+{
+ return _NS_InvokeByIndex(that, methodIndex, paramCount, params);
+}