1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
/* -*- 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/. */
// Implement shared vtbl methods.
#include "xptcprivate.h"
#include "xptiprivate.h"
// The Linux/PPC64 ABI passes the first 8 integral
// parameters and the first 13 floating point parameters in registers
// (r3-r10 and f1-f13), no stack space is allocated for these by the
// caller. The rest of the parameters are passed in the caller's stack
// area. The stack pointer has to retain 16-byte alignment.
// The PowerPC64 platform ABI can be found here:
// http://www.freestandards.org/spec/ELF/ppc64/
// and in particular:
// http://www.freestandards.org/spec/ELF/ppc64/PPC-elf64abi-1.9.html#FUNC-CALL
#define PARAM_BUFFER_COUNT 16
#define GPR_COUNT 7
#define FPR_COUNT 13
// PrepareAndDispatch() is called by SharedStub() and calls the actual method.
//
// - 'args[]' contains the arguments passed on stack
// - 'gprData[]' contains the arguments passed in integer registers
// - 'fprData[]' contains the arguments passed in floating point registers
//
// The parameters are mapped into an array of type 'nsXPTCMiniVariant'
// and then the method gets called.
#include <stdio.h>
extern "C" nsresult ATTRIBUTE_USED
PrepareAndDispatch(nsXPTCStubBase* self,
uint64_t methodIndex,
uint64_t* args,
uint64_t *gprData,
double *fprData)
{
nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
nsXPTCMiniVariant* dispatchParams = nullptr;
const nsXPTMethodInfo* info;
uint32_t paramCount;
uint32_t i;
nsresult result = NS_ERROR_FAILURE;
NS_ASSERTION(self,"no self");
self->mEntry->GetMethodInfo(uint16_t(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;
uint64_t* ap = args;
uint64_t tempu64;
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 (i < FPR_COUNT)
dp->val.d = fprData[i];
else
dp->val.d = *(double*) ap;
} else if (!param.IsOut() && type == nsXPTType::T_FLOAT) {
if (i < FPR_COUNT)
dp->val.f = (float) fprData[i]; // in registers floats are passed as doubles
else {
float *p = (float *)ap;
#ifndef __LITTLE_ENDIAN__
p++;
#endif
dp->val.f = *p;
}
} else { /* integer type or pointer */
if (i < GPR_COUNT)
tempu64 = gprData[i];
else
tempu64 = *ap;
if (param.IsOut() || !type.IsArithmetic())
dp->val.p = (void*) tempu64;
else if (type == nsXPTType::T_I8)
dp->val.i8 = (int8_t) tempu64;
else if (type == nsXPTType::T_I16)
dp->val.i16 = (int16_t) tempu64;
else if (type == nsXPTType::T_I32)
dp->val.i32 = (int32_t) tempu64;
else if (type == nsXPTType::T_I64)
dp->val.i64 = (int64_t) tempu64;
else if (type == nsXPTType::T_U8)
dp->val.u8 = (uint8_t) tempu64;
else if (type == nsXPTType::T_U16)
dp->val.u16 = (uint16_t) tempu64;
else if (type == nsXPTType::T_U32)
dp->val.u32 = (uint32_t) tempu64;
else if (type == nsXPTType::T_U64)
dp->val.u64 = (uint64_t) tempu64;
else if (type == nsXPTType::T_BOOL)
dp->val.b = (bool) tempu64;
else if (type == nsXPTType::T_CHAR)
dp->val.c = (char) tempu64;
else if (type == nsXPTType::T_WCHAR)
dp->val.wc = (wchar_t) tempu64;
else
NS_ERROR("bad type");
}
if (i >= 7)
ap++;
}
result = self->mOuter->CallMethod((uint16_t) methodIndex, info,
dispatchParams);
if (dispatchParams != paramBuffer)
delete [] dispatchParams;
return result;
}
// Load r11 with the constant 'n' and branch to SharedStub().
//
// XXX Yes, it's ugly that we're relying on gcc's name-mangling here;
// however, it's quick, dirty, and'll break when the ABI changes on
// us, which is what we want ;-).
// gcc-3 version
//
// As G++3 ABI contains the length of the functionname in the mangled
// name, it is difficult to get a generic assembler mechanism like
// in the G++ 2.95 case.
// Create names would be like:
// _ZN14nsXPTCStubBase5Stub1Ev
// _ZN14nsXPTCStubBase6Stub12Ev
// _ZN14nsXPTCStubBase7Stub123Ev
// _ZN14nsXPTCStubBase8Stub1234Ev
// etc.
// Use assembler directives to get the names right...
#if _CALL_ELF == 2
# 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\n" \
"_ZN14nsXPTCStubBase5Stub"#n"Ev: \n\t" \
"0: addis 2,12,.TOC.-0b@ha \n\t" \
"addi 2,2,.TOC.-0b@l \n\t" \
".localentry _ZN14nsXPTCStubBase5Stub"#n"Ev,.-_ZN14nsXPTCStubBase5Stub"#n"Ev \n\t" \
\
".elseif "#n" < 100 \n\t" \
".globl _ZN14nsXPTCStubBase6Stub"#n"Ev \n\t" \
".type _ZN14nsXPTCStubBase6Stub"#n"Ev,@function \n\n" \
"_ZN14nsXPTCStubBase6Stub"#n"Ev: \n\t" \
"0: addis 2,12,.TOC.-0b@ha \n\t" \
"addi 2,2,.TOC.-0b@l \n\t" \
".localentry _ZN14nsXPTCStubBase6Stub"#n"Ev,.-_ZN14nsXPTCStubBase6Stub"#n"Ev \n\t" \
\
".elseif "#n" < 1000 \n\t" \
".globl _ZN14nsXPTCStubBase7Stub"#n"Ev \n\t" \
".type _ZN14nsXPTCStubBase7Stub"#n"Ev,@function \n\n" \
"_ZN14nsXPTCStubBase7Stub"#n"Ev: \n\t" \
"0: addis 2,12,.TOC.-0b@ha \n\t" \
"addi 2,2,.TOC.-0b@l \n\t" \
".localentry _ZN14nsXPTCStubBase7Stub"#n"Ev,.-_ZN14nsXPTCStubBase7Stub"#n"Ev \n\t" \
\
".else \n\t" \
".err \"stub number "#n" >= 1000 not yet supported\"\n" \
".endif \n\t" \
\
"li 11,"#n" \n\t" \
"b SharedStub \n" \
);
#else
# define STUB_ENTRY(n) \
__asm__ ( \
".section \".toc\",\"aw\" \n\t" \
".section \".text\" \n\t" \
".align 2 \n\t" \
".if "#n" < 10 \n\t" \
".globl _ZN14nsXPTCStubBase5Stub"#n"Ev \n\t" \
".section \".opd\",\"aw\" \n\t" \
".align 3 \n\t" \
"_ZN14nsXPTCStubBase5Stub"#n"Ev: \n\t" \
".quad ._ZN14nsXPTCStubBase5Stub"#n"Ev,.TOC.@tocbase \n\t" \
".previous \n\t" \
".type _ZN14nsXPTCStubBase5Stub"#n"Ev,@function \n\n" \
"._ZN14nsXPTCStubBase5Stub"#n"Ev: \n\t" \
\
".elseif "#n" < 100 \n\t" \
".globl _ZN14nsXPTCStubBase6Stub"#n"Ev \n\t" \
".section \".opd\",\"aw\" \n\t" \
".align 3 \n\t" \
"_ZN14nsXPTCStubBase6Stub"#n"Ev: \n\t" \
".quad ._ZN14nsXPTCStubBase6Stub"#n"Ev,.TOC.@tocbase \n\t" \
".previous \n\t" \
".type _ZN14nsXPTCStubBase6Stub"#n"Ev,@function \n\n" \
"._ZN14nsXPTCStubBase6Stub"#n"Ev: \n\t" \
\
".elseif "#n" < 1000 \n\t" \
".globl _ZN14nsXPTCStubBase7Stub"#n"Ev \n\t" \
".section \".opd\",\"aw\" \n\t" \
".align 3 \n\t" \
"_ZN14nsXPTCStubBase7Stub"#n"Ev: \n\t" \
".quad ._ZN14nsXPTCStubBase7Stub"#n"Ev,.TOC.@tocbase \n\t" \
".previous \n\t" \
".type _ZN14nsXPTCStubBase7Stub"#n"Ev,@function \n\n" \
"._ZN14nsXPTCStubBase7Stub"#n"Ev: \n\t" \
\
".else \n\t" \
".err \"stub number "#n" >= 1000 not yet supported\"\n" \
".endif \n\t" \
\
"li 11,"#n" \n\t" \
"b SharedStub \n" \
);
#endif
#define SENTINEL_ENTRY(n) \
nsresult nsXPTCStubBase::Sentinel##n() \
{ \
NS_ERROR("nsXPTCStubBase::Sentinel called"); \
return NS_ERROR_NOT_IMPLEMENTED; \
}
#include "xptcstubsdef.inc"
|
