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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org Code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
// Implement shared vtbl methods.
#include "xptcprivate.h"
// The Linux/x86-64 ABI passes the first 6 integer parameters and the
// first 8 floating point parameters in registers (rdi, rsi, rdx, rcx,
// r8, r9 and xmm0-xmm7), no stack space is allocated for these by the
// caller. The rest of the parameters are passed in the callers stack
// area.
const PRUint32 PARAM_BUFFER_COUNT = 16;
const PRUint32 GPR_COUNT = 6;
const PRUint32 FPR_COUNT = 8;
// PrepareAndDispatch() is called by SharedStub() and calls the actual method.
//
// - 'args[]' contains the arguments passed on stack
// - 'gpregs[]' contains the arguments passed in integer registers
// - 'fpregs[]' contains the arguments passed in floating point registers
//
// The parameters are mapped into an array of type 'nsXPTCMiniVariant'
// and then the method gets called.
extern "C" nsresult
PrepareAndDispatch(nsXPTCStubBase * self, PRUint32 methodIndex,
PRUint64 * args, PRUint64 * gpregs, double *fpregs)
{
nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
nsXPTCMiniVariant* dispatchParams = NULL;
nsIInterfaceInfo* iface_info = NULL;
const nsXPTMethodInfo* info = NULL;
PRUint32 paramCount;
PRUint32 i;
nsresult result = NS_ERROR_FAILURE;
NS_ASSERTION(self,"no self");
self->GetInterfaceInfo(&iface_info);
NS_ASSERTION(iface_info,"no interface info");
if (!iface_info)
return NS_ERROR_UNEXPECTED;
iface_info->GetMethodInfo(PRUint16(methodIndex), &info);
NS_ASSERTION(info,"no method info");
if (!info)
return NS_ERROR_UNEXPECTED;
paramCount = info->GetParamCount();
// setup variant array pointer
if (paramCount > PARAM_BUFFER_COUNT)
dispatchParams = new nsXPTCMiniVariant[paramCount];
else
dispatchParams = paramBuffer;
NS_ASSERTION(dispatchParams,"no place for params");
if (!dispatchParams)
return NS_ERROR_OUT_OF_MEMORY;
PRUint64* ap = args;
PRUint32 nr_gpr = 1; // skip one GPR register for 'that'
PRUint32 nr_fpr = 0;
PRUint64 value;
for (i = 0; i < paramCount; i++) {
const nsXPTParamInfo& param = info->GetParam(i);
const nsXPTType& type = param.GetType();
nsXPTCMiniVariant* dp = &dispatchParams[i];
if (!param.IsOut() && type == nsXPTType::T_DOUBLE) {
if (nr_fpr < FPR_COUNT)
dp->val.d = fpregs[nr_fpr++];
else
dp->val.d = *(double*) ap++;
continue;
}
else if (!param.IsOut() && type == nsXPTType::T_FLOAT) {
if (nr_fpr < FPR_COUNT)
// The value in %xmm register is already prepared to
// be retrieved as a float. Therefore, we pass the
// value verbatim, as a double without conversion.
dp->val.d = *(double*) ap++;
else
dp->val.f = *(float*) ap++;
continue;
}
else {
if (nr_gpr < GPR_COUNT)
value = gpregs[nr_gpr++];
else
value = *ap++;
}
if (param.IsOut() || !type.IsArithmetic()) {
dp->val.p = (void*) value;
continue;
}
switch (type) {
case nsXPTType::T_I8: dp->val.i8 = (PRInt8) value; break;
case nsXPTType::T_I16: dp->val.i16 = (PRInt16) value; break;
case nsXPTType::T_I32: dp->val.i32 = (PRInt32) value; break;
case nsXPTType::T_I64: dp->val.i64 = (PRInt64) value; break;
case nsXPTType::T_U8: dp->val.u8 = (PRUint8) value; break;
case nsXPTType::T_U16: dp->val.u16 = (PRUint16) value; break;
case nsXPTType::T_U32: dp->val.u32 = (PRUint32) value; break;
case nsXPTType::T_U64: dp->val.u64 = (PRUint64) value; break;
case nsXPTType::T_BOOL: dp->val.b = (PRBool) value; break;
case nsXPTType::T_CHAR: dp->val.c = (char) value; break;
case nsXPTType::T_WCHAR: dp->val.wc = (wchar_t) value; break;
default:
NS_ASSERTION(0, "bad type");
break;
}
}
result = self->CallMethod((PRUint16) methodIndex, info, dispatchParams);
NS_RELEASE(iface_info);
if (dispatchParams != paramBuffer)
delete [] dispatchParams;
return result;
}
#if defined(__GXX_ABI_VERSION) && __GXX_ABI_VERSION >= 100 /* G++ V3 ABI */
// Linux/x86-64 uses gcc >= 3.1
#define STUB_ENTRY(n) \
asm(".section \".text\"\n\t" \
".align 2\n\t" \
".if " #n " < 10\n\t" \
".globl _ZN14nsXPTCStubBase5Stub" #n "Ev\n\t" \
".type _ZN14nsXPTCStubBase5Stub" #n "Ev,@function\n" \
"_ZN14nsXPTCStubBase5Stub" #n "Ev:\n\t" \
".elseif " #n " < 100\n\t" \
".globl _ZN14nsXPTCStubBase6Stub" #n "Ev\n\t" \
".type _ZN14nsXPTCStubBase6Stub" #n "Ev,@function\n" \
"_ZN14nsXPTCStubBase6Stub" #n "Ev:\n\t" \
".elseif " #n " < 1000\n\t" \
".globl _ZN14nsXPTCStubBase7Stub" #n "Ev\n\t" \
".type _ZN14nsXPTCStubBase7Stub" #n "Ev,@function\n" \
"_ZN14nsXPTCStubBase7Stub" #n "Ev:\n\t" \
".else\n\t" \
".err \"stub number " #n " >= 1000 not yet supported\"\n\t" \
".endif\n\t" \
"movl $" #n ", %eax\n\t" \
"jmp SharedStub\n\t" \
".if " #n " < 10\n\t" \
".size _ZN14nsXPTCStubBase5Stub" #n "Ev,.-_ZN14nsXPTCStubBase5Stub" #n "Ev\n\t" \
".elseif " #n " < 100\n\t" \
".size _ZN14nsXPTCStubBase6Stub" #n "Ev,.-_ZN14nsXPTCStubBase6Stub" #n "Ev\n\t" \
".else\n\t" \
".size _ZN14nsXPTCStubBase7Stub" #n "Ev,.-_ZN14nsXPTCStubBase7Stub" #n "Ev\n\t" \
".endif");
// static nsresult SharedStub(PRUint32 methodIndex)
asm(".section \".text\"\n\t"
".align 2\n\t"
".type SharedStub,@function\n\t"
"SharedStub:\n\t"
// make room for gpregs (48), fpregs (64)
"pushq %rbp\n\t"
"movq %rsp,%rbp\n\t"
"subq $112,%rsp\n\t"
// save GP registers
"movq %rdi,-112(%rbp)\n\t"
"movq %rsi,-104(%rbp)\n\t"
"movq %rdx, -96(%rbp)\n\t"
"movq %rcx, -88(%rbp)\n\t"
"movq %r8 , -80(%rbp)\n\t"
"movq %r9 , -72(%rbp)\n\t"
"leaq -112(%rbp),%rcx\n\t"
// save FP registers
"movsd %xmm0,-64(%rbp)\n\t"
"movsd %xmm1,-56(%rbp)\n\t"
"movsd %xmm2,-48(%rbp)\n\t"
"movsd %xmm3,-40(%rbp)\n\t"
"movsd %xmm4,-32(%rbp)\n\t"
"movsd %xmm5,-24(%rbp)\n\t"
"movsd %xmm6,-16(%rbp)\n\t"
"movsd %xmm7, -8(%rbp)\n\t"
"leaq -64(%rbp),%r8\n\t"
// rdi has the 'self' pointer already
"movl %eax,%esi\n\t"
"leaq 16(%rbp),%rdx\n\t"
"call PrepareAndDispatch@plt\n\t"
"leave\n\t"
"ret\n\t"
".size SharedStub,.-SharedStub");
#define SENTINEL_ENTRY(n) \
nsresult nsXPTCStubBase::Sentinel##n() \
{ \
NS_ASSERTION(0,"nsXPTCStubBase::Sentinel called"); \
return NS_ERROR_NOT_IMPLEMENTED; \
}
#include "xptcstubsdef.inc"
#else
#error "Unsupported compiler. Use gcc >= 3.1 for Linux/x86-64."
#endif /* __GNUC__ */
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