summaryrefslogtreecommitdiffstats
path: root/xpcom/reflect/xptcall/md/win32/xptcinvoke_x86_gnu.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'xpcom/reflect/xptcall/md/win32/xptcinvoke_x86_gnu.cpp')
-rw-r--r--xpcom/reflect/xptcall/md/win32/xptcinvoke_x86_gnu.cpp106
1 files changed, 106 insertions, 0 deletions
diff --git a/xpcom/reflect/xptcall/md/win32/xptcinvoke_x86_gnu.cpp b/xpcom/reflect/xptcall/md/win32/xptcinvoke_x86_gnu.cpp
new file mode 100644
index 000000000..0e73e99f3
--- /dev/null
+++ b/xpcom/reflect/xptcall/md/win32/xptcinvoke_x86_gnu.cpp
@@ -0,0 +1,106 @@
+/* -*- 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"
+
+extern "C" {
+void __attribute__ ((__used__)) __attribute__ ((regparm(3)))
+invoke_copy_to_stack(uint32_t paramCount, nsXPTCVariant* s, uint32_t* d)
+{
+ for(uint32_t i = paramCount; i >0; i--, d++, s++)
+ {
+ if(s->IsPtrData())
+ {
+ *((void**)d) = s->ptr;
+ continue;
+ }
+
+ switch(s->type)
+ {
+ case nsXPTType::T_I8 : *((int8_t*) d) = s->val.i8; break;
+ case nsXPTType::T_I16 : *((int16_t*) d) = s->val.i16; break;
+ case nsXPTType::T_I32 : *((int32_t*) d) = s->val.i32; break;
+ case nsXPTType::T_I64 : *((int64_t*) d) = s->val.i64; d++; break;
+ case nsXPTType::T_U8 : *((uint8_t*) d) = s->val.u8; break;
+ case nsXPTType::T_U16 : *((uint16_t*)d) = s->val.u16; break;
+ case nsXPTType::T_U32 : *((uint32_t*)d) = s->val.u32; break;
+ case nsXPTType::T_U64 : *((uint64_t*)d) = s->val.u64; d++; break;
+ case nsXPTType::T_FLOAT : *((float*) d) = s->val.f; break;
+ case nsXPTType::T_DOUBLE : *((double*) d) = s->val.d; d++; break;
+ case nsXPTType::T_BOOL : *((bool*) d) = s->val.b; break;
+ case nsXPTType::T_CHAR : *((char*) d) = s->val.c; break;
+ case nsXPTType::T_WCHAR : *((wchar_t*) d) = s->val.wc; break;
+ default:
+ // all the others are plain pointer types
+ *((void**)d) = s->val.p;
+ break;
+ }
+ }
+}
+} // extern "C"
+
+/*
+ EXPORT_XPCOM_API(nsresult)
+ NS_InvokeByIndex(nsISupports* that, uint32_t methodIndex,
+ uint32_t paramCount, nsXPTCVariant* params);
+
+ Each param takes at most two 4-byte words.
+ It doesn't matter if we push too many words, and calculating the exact
+ amount takes time.
+
+ that = ebp + 0x08
+ methodIndex = ebp + 0x0c
+ paramCount = ebp + 0x10
+ params = ebp + 0x14
+
+*/
+
+__asm__ (
+ ".text\n\t"
+/* alignment here seems unimportant here; this was 16, now it's 2 which
+ is what xptcstubs uses. */
+ ".align 2\n\t"
+ ".globl _NS_InvokeByIndex\n\t"
+ "_NS_InvokeByIndex:\n\t"
+ "pushl %ebp\n\t"
+ "movl %esp, %ebp\n\t"
+ "movl 0x10(%ebp), %eax\n\t"
+ "leal 0(,%eax,8),%edx\n\t"
+
+ /* set up call frame for method. */
+ "subl %edx, %esp\n\t" /* make room for params. */
+/* Align to maximum x86 data size: 128 bits == 16 bytes == XMM register size.
+ * This is to avoid protection faults where SSE+ alignment of stack pointer
+ * is assumed and required, e.g. by GCC4's -ftree-vectorize option.
+ */
+ "andl $0xfffffff0, %esp\n\t" /* drop(?) stack ptr to 128-bit align */
+/* $esp should be aligned to a 16-byte boundary here (note we include an
+ * additional 4 bytes in a later push instruction). This will ensure $ebp
+ * in the function called below is aligned to a 0x8 boundary. SSE instructions
+ * like movapd/movdqa expect memory operand to be aligned on a 16-byte
+ * boundary. The GCC compiler will generate the memory operand using $ebp
+ * with an 8-byte offset.
+ */
+ "subl $0xc, %esp\n\t" /* lower again; push/call below will re-align */
+ "movl %esp, %ecx\n\t" /* ecx = d */
+ "movl 8(%ebp), %edx\n\t" /* edx = this */
+ "pushl %edx\n\t" /* push this. esp % 16 == 0 */
+
+ "movl 0x14(%ebp), %edx\n\t"
+ "call _invoke_copy_to_stack\n\t"
+ "movl 0x08(%ebp), %ecx\n\t" /* 'that' */
+ "movl (%ecx), %edx\n\t"
+ "movl 0x0c(%ebp), %eax\n\t" /* function index */
+ "leal (%edx,%eax,4), %edx\n\t"
+ "call *(%edx)\n\t"
+ "movl %ebp, %esp\n\t"
+ "popl %ebp\n\t"
+ "ret\n"
+ ".section .drectve\n\t"
+ ".ascii \" -export:NS_InvokeByIndex\"\n\t"
+ ".text\n\t"
+);