1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/xpcom/reflect/xptcall/src/md/unix/xptcinvoke_gcc_x86_unix.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,97 @@
1.4 +/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +/* Platform specific code to invoke XPCOM methods on native objects */
1.10 +
1.11 +#include "xptcprivate.h"
1.12 +#include "xptc_gcc_x86_unix.h"
1.13 +
1.14 +extern "C" {
1.15 +static void ATTRIBUTE_USED __attribute__ ((regparm(3)))
1.16 +invoke_copy_to_stack(uint32_t paramCount, nsXPTCVariant* s, uint32_t* d)
1.17 +{
1.18 + for(uint32_t i = paramCount; i >0; i--, d++, s++)
1.19 + {
1.20 + if(s->IsPtrData())
1.21 + {
1.22 + *((void**)d) = s->ptr;
1.23 + continue;
1.24 + }
1.25 +
1.26 + switch(s->type)
1.27 + {
1.28 + case nsXPTType::T_I64 : *((int64_t*) d) = s->val.i64; d++; break;
1.29 + case nsXPTType::T_U64 : *((uint64_t*)d) = s->val.u64; d++; break;
1.30 + case nsXPTType::T_DOUBLE : *((double*) d) = s->val.d; d++; break;
1.31 + default : *((void**)d) = s->val.p; break;
1.32 + }
1.33 + }
1.34 +}
1.35 +} // extern "C"
1.36 +
1.37 +/*
1.38 + EXPORT_XPCOM_API(nsresult)
1.39 + NS_InvokeByIndex(nsISupports* that, uint32_t methodIndex,
1.40 + uint32_t paramCount, nsXPTCVariant* params);
1.41 +
1.42 + Each param takes at most two 4-byte words.
1.43 + It doesn't matter if we push too many words, and calculating the exact
1.44 + amount takes time.
1.45 +
1.46 + that = ebp + 0x08
1.47 + methodIndex = ebp + 0x0c
1.48 + paramCount = ebp + 0x10
1.49 + params = ebp + 0x14
1.50 +
1.51 +*/
1.52 +
1.53 +__asm__ (
1.54 + ".text\n\t"
1.55 +/* alignment here seems unimportant here; this was 16, now it's 2 which
1.56 + is what xptcstubs uses. */
1.57 + ".align 2\n\t"
1.58 + ".globl " SYMBOL_UNDERSCORE "NS_InvokeByIndex\n\t"
1.59 +#ifndef XP_MACOSX
1.60 + ".type " SYMBOL_UNDERSCORE "NS_InvokeByIndex,@function\n"
1.61 +#endif
1.62 + SYMBOL_UNDERSCORE "NS_InvokeByIndex:\n\t"
1.63 + "pushl %ebp\n\t"
1.64 + "movl %esp, %ebp\n\t"
1.65 + "movl 0x10(%ebp), %eax\n\t"
1.66 + "leal 0(,%eax,8),%edx\n\t"
1.67 +
1.68 + /* set up call frame for method. */
1.69 + "subl %edx, %esp\n\t" /* make room for params. */
1.70 +/* Align to maximum x86 data size: 128 bits == 16 bytes == XMM register size.
1.71 + * This is to avoid protection faults where SSE+ alignment of stack pointer
1.72 + * is assumed and required, e.g. by GCC4's -ftree-vectorize option.
1.73 + */
1.74 + "andl $0xfffffff0, %esp\n\t" /* drop(?) stack ptr to 128-bit align */
1.75 +/* $esp should be aligned to a 16-byte boundary here (note we include an
1.76 + * additional 4 bytes in a later push instruction). This will ensure $ebp
1.77 + * in the function called below is aligned to a 0x8 boundary. SSE instructions
1.78 + * like movapd/movdqa expect memory operand to be aligned on a 16-byte
1.79 + * boundary. The GCC compiler will generate the memory operand using $ebp
1.80 + * with an 8-byte offset.
1.81 + */
1.82 + "subl $0xc, %esp\n\t" /* lower again; push/call below will re-align */
1.83 + "movl %esp, %ecx\n\t" /* ecx = d */
1.84 + "movl 8(%ebp), %edx\n\t" /* edx = this */
1.85 + "pushl %edx\n\t" /* push this. esp % 16 == 0 */
1.86 +
1.87 + "movl 0x14(%ebp), %edx\n\t"
1.88 + "call " SYMBOL_UNDERSCORE "invoke_copy_to_stack\n\t"
1.89 + "movl 0x08(%ebp), %ecx\n\t" /* 'that' */
1.90 + "movl (%ecx), %edx\n\t"
1.91 + "movl 0x0c(%ebp), %eax\n\t" /* function index */
1.92 + "leal (%edx,%eax,4), %edx\n\t"
1.93 + "call *(%edx)\n\t"
1.94 + "movl %ebp, %esp\n\t"
1.95 + "popl %ebp\n\t"
1.96 + "ret\n"
1.97 +#ifndef XP_MACOSX
1.98 + ".size " SYMBOL_UNDERSCORE "NS_InvokeByIndex, . -" SYMBOL_UNDERSCORE "NS_InvokeByIndex\n\t"
1.99 +#endif
1.100 +);
