MoonchildProductions/UXP#2897: backport upstream xptcinvoke and xptcstubs for Loongarch64

xpcom/reflect/xptcall/md/unix/xptcinvoke_asm_loongarch64.S

@@ -0,0 +1,91 @@
+/* This Source Code Form subject to the terms of 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/.
+ */
+
+  .set NGPREGS, 8
+  .set NFPREGS, 8
+
+  .text
+  .globl  _NS_InvokeByIndex
+  .type   _NS_InvokeByIndex, @function
+/*
+ * _NS_InvokeByIndex(nsISupports* that, uint32_t methodIndex,
+ *                   uint32_t paramCount, nsXPTCVariant* params)
+ */
+_NS_InvokeByIndex:
+  .cfi_startproc
+  addi.d    $sp, $sp, -32
+  .cfi_def_cfa_offset 32
+  st.d      $s0, $sp, 16
+  .cfi_offset 23, -16
+  st.d      $s1, $sp, 8
+  .cfi_offset 24, -24
+  st.d      $s2, $sp, 0
+  .cfi_offset 25, -32
+  st.d      $ra, $sp, 24
+  .cfi_offset 1, -8
+
+  move      $s2, $a0
+  move      $s1, $a1
+  move      $s0, $sp
+  .cfi_def_cfa_register 23
+
+  /* 16-bytes alignment */
+  addi.d    $a0, $a2, 1
+  li.d      $t4, 0xfffffffffffffffe
+  and       $a0, $a0, $t4
+  slli.d    $a0, $a0, 3
+  sub.d     $sp, $sp, $a0
+  move      $a4, $sp
+
+  addi.d    $sp, $sp, -8*(NGPREGS+NFPREGS)
+  move      $a0, $sp
+  addi.d    $a1, $sp, 8*NGPREGS
+
+  bl        invoke_copy_to_stack
+
+  /* 1st argument is this */
+  move      $a0, $s2
+
+  ld.d      $a1, $sp, 8
+  ld.d      $a2, $sp, 16
+  ld.d      $a3, $sp, 24
+  ld.d      $a4, $sp, 32
+  ld.d      $a5, $sp, 40
+  ld.d      $a6, $sp, 48
+  ld.d      $a7, $sp, 56
+
+  fld.d     $fa0, $sp, 64
+  fld.d     $fa1, $sp, 72
+  fld.d     $fa2, $sp, 80
+  fld.d     $fa3, $sp, 88
+  fld.d     $fa4, $sp, 96
+  fld.d     $fa5, $sp, 104
+  fld.d     $fa6, $sp, 112
+  fld.d     $fa7, $sp, 120
+
+  addi.d    $sp, $sp, 8*(NGPREGS+NFPREGS)
+
+  ld.d      $s2, $s2, 0
+  slli.w    $s1, $s1, 3
+  add.d     $s2, $s2, $s1
+  ld.d      $t3, $s2, 0
+  jirl      $ra, $t3, 0
+
+  move      $sp, $s0
+  .cfi_def_cfa_register 3
+  ld.d      $s0, $sp, 16
+  .cfi_restore 23
+  ld.d      $s1, $sp, 8
+  .cfi_restore 24
+  ld.d      $s2, $sp, 0
+  .cfi_restore 25
+  ld.d      $ra, $sp, 24
+  .cfi_restore 1
+  addi.d    $sp, $sp, 32
+  .cfi_def_cfa_offset -32
+  jirl      $zero, $ra, 0
+  .cfi_endproc
+  .size   _NS_InvokeByIndex, .-_NS_InvokeByIndex
+  .section .note.GNU-stack, "", @progbits