xpcom/reflect/xptcall/src/md/unix/xptcstubs_ppc_linux.cpp@129ffea94266
xpcom/reflect/xptcall/src/md/unix/xptcstubs_ppc_linux.cpp
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6 // Implement shared vtbl methods.
8 #include "xptcprivate.h"
9 #include "xptiprivate.h"
11 // The Linux/PPC ABI (aka PPC/SYSV ABI) passes the first 8 integral
12 // parameters and the first 8 floating point parameters in registers
13 // (r3-r10 and f1-f8), no stack space is allocated for these by the
14 // caller. The rest of the parameters are passed in the callers stack
15 // area. The stack pointer has to retain 16-byte alignment, longlongs
16 // and doubles are aligned on 8-byte boundaries.
17 #ifndef __NO_FPRS__
18 #define PARAM_BUFFER_COUNT 16
19 #define GPR_COUNT 8
20 #define FPR_COUNT 8
21 #else
22 #define PARAM_BUFFER_COUNT 8
23 #define GPR_COUNT 8
24 #endif
25 // PrepareAndDispatch() is called by SharedStub() and calls the actual method.
26 //
27 // - 'args[]' contains the arguments passed on stack
28 // - 'gprData[]' contains the arguments passed in integer registers
29 // - 'fprData[]' contains the arguments passed in floating point registers
30 //
31 // The parameters are mapped into an array of type 'nsXPTCMiniVariant'
32 // and then the method gets called.
34 extern "C" nsresult ATTRIBUTE_USED
35 PrepareAndDispatch(nsXPTCStubBase* self,
36 uint32_t methodIndex,
37 uint32_t* args,
38 uint32_t *gprData,
39 double *fprData)
40 {
41 nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
42 nsXPTCMiniVariant* dispatchParams = nullptr;
43 const nsXPTMethodInfo* info = nullptr;
44 uint32_t paramCount;
45 uint32_t i;
46 nsresult result = NS_ERROR_FAILURE;
48 NS_ASSERTION(self,"no self");
50 self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info);
51 NS_ASSERTION(info,"no method info");
52 if (! info)
53 return NS_ERROR_UNEXPECTED;
55 paramCount = info->GetParamCount();
57 // setup variant array pointer
58 if(paramCount > PARAM_BUFFER_COUNT)
59 dispatchParams = new nsXPTCMiniVariant[paramCount];
60 else
61 dispatchParams = paramBuffer;
63 NS_ASSERTION(dispatchParams,"no place for params");
64 if (! dispatchParams)
65 return NS_ERROR_OUT_OF_MEMORY;
67 uint32_t* ap = args;
68 uint32_t gpr = 1; // skip one GPR register
69 #ifndef __NO_FPRS__
70 uint32_t fpr = 0;
71 #endif
72 uint32_t tempu32;
73 uint64_t tempu64;
75 for(i = 0; i < paramCount; i++) {
76 const nsXPTParamInfo& param = info->GetParam(i);
77 const nsXPTType& type = param.GetType();
78 nsXPTCMiniVariant* dp = &dispatchParams[i];
80 if (!param.IsOut() && type == nsXPTType::T_DOUBLE) {
81 #ifndef __NO_FPRS__
82 if (fpr < FPR_COUNT)
83 dp->val.d = fprData[fpr++];
84 #else
85 if (gpr & 1)
86 gpr++;
87 if (gpr + 1 < GPR_COUNT) {
88 dp->val.d = *(double*) &gprData[gpr];
89 gpr += 2;
90 }
91 #endif
92 else {
93 if ((uint32_t) ap & 4) ap++; // doubles are 8-byte aligned on stack
94 dp->val.d = *(double*) ap;
95 ap += 2;
96 }
97 continue;
98 }
99 else if (!param.IsOut() && type == nsXPTType::T_FLOAT) {
100 #ifndef __NO_FPRS__
101 if (fpr < FPR_COUNT)
102 dp->val.f = (float) fprData[fpr++]; // in registers floats are passed as doubles
103 #else
104 if (gpr < GPR_COUNT)
105 dp->val.f = *(float*) &gprData[gpr++];
106 #endif
107 else
108 dp->val.f = *(float*) ap++;
109 continue;
110 }
111 else if (!param.IsOut() && (type == nsXPTType::T_I64
112 || type == nsXPTType::T_U64)) {
113 if (gpr & 1) gpr++; // longlongs are aligned in odd/even register pairs, eg. r5/r6
114 if ((gpr + 1) < GPR_COUNT) {
115 tempu64 = *(uint64_t*) &gprData[gpr];
116 gpr += 2;
117 }
118 else {
119 if ((uint32_t) ap & 4) ap++; // longlongs are 8-byte aligned on stack
120 tempu64 = *(uint64_t*) ap;
121 ap += 2;
122 }
123 }
124 else {
125 if (gpr < GPR_COUNT)
126 tempu32 = gprData[gpr++];
127 else
128 tempu32 = *ap++;
129 }
131 if(param.IsOut() || !type.IsArithmetic()) {
132 dp->val.p = (void*) tempu32;
133 continue;
134 }
136 switch(type) {
137 case nsXPTType::T_I8: dp->val.i8 = (int8_t) tempu32; break;
138 case nsXPTType::T_I16: dp->val.i16 = (int16_t) tempu32; break;
139 case nsXPTType::T_I32: dp->val.i32 = (int32_t) tempu32; break;
140 case nsXPTType::T_I64: dp->val.i64 = (int64_t) tempu64; break;
141 case nsXPTType::T_U8: dp->val.u8 = (uint8_t) tempu32; break;
142 case nsXPTType::T_U16: dp->val.u16 = (uint16_t) tempu32; break;
143 case nsXPTType::T_U32: dp->val.u32 = (uint32_t) tempu32; break;
144 case nsXPTType::T_U64: dp->val.u64 = (uint64_t) tempu64; break;
145 case nsXPTType::T_BOOL: dp->val.b = (bool) tempu32; break;
146 case nsXPTType::T_CHAR: dp->val.c = (char) tempu32; break;
147 case nsXPTType::T_WCHAR: dp->val.wc = (wchar_t) tempu32; break;
149 default:
150 NS_ERROR("bad type");
151 break;
152 }
153 }
155 result = self->mOuter->CallMethod((uint16_t)methodIndex,
156 info,
157 dispatchParams);
159 if (dispatchParams != paramBuffer)
160 delete [] dispatchParams;
162 return result;
163 }
165 // Load r11 with the constant 'n' and branch to SharedStub().
166 //
167 // XXX Yes, it's ugly that we're relying on gcc's name-mangling here;
168 // however, it's quick, dirty, and'll break when the ABI changes on
169 // us, which is what we want ;-).
171 // gcc-3 version
172 //
173 // As G++3 ABI contains the length of the functionname in the mangled
174 // name, it is difficult to get a generic assembler mechanism like
175 // in the G++ 2.95 case.
176 // Create names would be like:
177 // _ZN14nsXPTCStubBase5Stub1Ev
178 // _ZN14nsXPTCStubBase6Stub12Ev
179 // _ZN14nsXPTCStubBase7Stub123Ev
180 // _ZN14nsXPTCStubBase8Stub1234Ev
181 // etc.
182 // Use assembler directives to get the names right...
184 # define STUB_ENTRY(n) \
185 __asm__ ( \
186 ".align 2 \n\t" \
187 ".if "#n" < 10 \n\t" \
188 ".globl _ZN14nsXPTCStubBase5Stub"#n"Ev \n\t" \
189 ".type _ZN14nsXPTCStubBase5Stub"#n"Ev,@function \n\n" \
190 "_ZN14nsXPTCStubBase5Stub"#n"Ev: \n\t" \
191 \
192 ".elseif "#n" < 100 \n\t" \
193 ".globl _ZN14nsXPTCStubBase6Stub"#n"Ev \n\t" \
194 ".type _ZN14nsXPTCStubBase6Stub"#n"Ev,@function \n\n" \
195 "_ZN14nsXPTCStubBase6Stub"#n"Ev: \n\t" \
196 \
197 ".elseif "#n" < 1000 \n\t" \
198 ".globl _ZN14nsXPTCStubBase7Stub"#n"Ev \n\t" \
199 ".type _ZN14nsXPTCStubBase7Stub"#n"Ev,@function \n\n" \
200 "_ZN14nsXPTCStubBase7Stub"#n"Ev: \n\t" \
201 \
202 ".else \n\t" \
203 ".err \"stub number "#n" >= 1000 not yet supported\"\n" \
204 ".endif \n\t" \
205 \
206 "li 11,"#n" \n\t" \
207 "b SharedStub@local \n" \
208 );
210 #define SENTINEL_ENTRY(n) \
211 nsresult nsXPTCStubBase::Sentinel##n() \
212 { \
213 NS_ERROR("nsXPTCStubBase::Sentinel called"); \
214 return NS_ERROR_NOT_IMPLEMENTED; \
215 }
217 #include "xptcstubsdef.inc"
