xpcom/reflect/xptcall/src/md/unix/xptcstubs_arm.cpp@129ffea94266
xpcom/reflect/xptcall/src/md/unix/xptcstubs_arm.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 #if !defined(__arm__) && !(defined(LINUX) || defined(ANDROID))
12 #error "This code is for Linux ARM only. Please check if it works for you, too.\nDepends strongly on gcc behaviour."
13 #endif
15 /* Specify explicitly a symbol for this function, don't try to guess the c++ mangled symbol. */
16 static nsresult PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, uint32_t* args) asm("_PrepareAndDispatch")
17 ATTRIBUTE_USED;
19 #ifdef __ARM_EABI__
20 #define DOUBLEWORD_ALIGN(p) ((uint32_t *)((((uint32_t)(p)) + 7) & 0xfffffff8))
21 #else
22 #define DOUBLEWORD_ALIGN(p) (p)
23 #endif
25 // Apple's iOS toolchain is lame and does not support .cfi directives.
26 #ifdef __APPLE__
27 #define CFI(str)
28 #else
29 #define CFI(str) str
30 #endif
32 static nsresult
33 PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, uint32_t* args)
34 {
35 #define PARAM_BUFFER_COUNT 16
37 nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
38 nsXPTCMiniVariant* dispatchParams = nullptr;
39 const nsXPTMethodInfo* info;
40 uint8_t paramCount;
41 uint8_t i;
42 nsresult result = NS_ERROR_FAILURE;
44 NS_ASSERTION(self,"no self");
46 self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info);
47 paramCount = info->GetParamCount();
49 // setup variant array pointer
50 if(paramCount > PARAM_BUFFER_COUNT)
51 dispatchParams = new nsXPTCMiniVariant[paramCount];
52 else
53 dispatchParams = paramBuffer;
54 NS_ASSERTION(dispatchParams,"no place for params");
56 uint32_t* ap = args;
57 for(i = 0; i < paramCount; i++, ap++)
58 {
59 const nsXPTParamInfo& param = info->GetParam(i);
60 const nsXPTType& type = param.GetType();
61 nsXPTCMiniVariant* dp = &dispatchParams[i];
63 if(param.IsOut() || !type.IsArithmetic())
64 {
65 dp->val.p = (void*) *ap;
66 continue;
67 }
68 // else
69 switch(type)
70 {
71 case nsXPTType::T_I8 : dp->val.i8 = *((int8_t*) ap); break;
72 case nsXPTType::T_I16 : dp->val.i16 = *((int16_t*) ap); break;
73 case nsXPTType::T_I32 : dp->val.i32 = *((int32_t*) ap); break;
74 case nsXPTType::T_I64 : ap = DOUBLEWORD_ALIGN(ap);
75 dp->val.i64 = *((int64_t*) ap); ap++; break;
76 case nsXPTType::T_U8 : dp->val.u8 = *((uint8_t*) ap); break;
77 case nsXPTType::T_U16 : dp->val.u16 = *((uint16_t*)ap); break;
78 case nsXPTType::T_U32 : dp->val.u32 = *((uint32_t*)ap); break;
79 case nsXPTType::T_U64 : ap = DOUBLEWORD_ALIGN(ap);
80 dp->val.u64 = *((uint64_t*)ap); ap++; break;
81 case nsXPTType::T_FLOAT : dp->val.f = *((float*) ap); break;
82 case nsXPTType::T_DOUBLE : ap = DOUBLEWORD_ALIGN(ap);
83 dp->val.d = *((double*) ap); ap++; break;
84 case nsXPTType::T_BOOL : dp->val.b = *((bool*) ap); break;
85 case nsXPTType::T_CHAR : dp->val.c = *((char*) ap); break;
86 case nsXPTType::T_WCHAR : dp->val.wc = *((wchar_t*) ap); break;
87 default:
88 NS_ERROR("bad type");
89 break;
90 }
91 }
93 result = self->mOuter->CallMethod((uint16_t)methodIndex, info, dispatchParams);
95 if(dispatchParams != paramBuffer)
96 delete [] dispatchParams;
98 return result;
99 }
101 /*
102 * This is our shared stub.
103 *
104 * r0 = Self.
105 *
106 * The Rules:
107 * We pass an (undefined) number of arguments into this function.
108 * The first 3 C++ arguments are in r1 - r3, the rest are built
109 * by the calling function on the stack.
110 *
111 * We are allowed to corrupt r0 - r3, ip, and lr.
112 *
113 * Other Info:
114 * We pass the stub number in using `ip'.
115 *
116 * Implementation:
117 * - We save r1 to r3 inclusive onto the stack, which will be
118 * immediately below the caller saved arguments.
119 * - setup r2 (PrepareAndDispatch's args pointer) to point at
120 * the base of all these arguments
121 * - Save LR (for the return address)
122 * - Set r1 (PrepareAndDispatch's methodindex argument) from ip
123 * - r0 is passed through (self)
124 * - Call PrepareAndDispatch
125 * - When the call returns, we return by loading the PC off the
126 * stack, and undoing the stack (one instruction)!
127 *
128 */
129 __asm__ ("\n"
130 ".text\n"
131 ".align 2\n"
132 "SharedStub:\n"
133 ".fnstart\n"
134 CFI(".cfi_startproc\n")
135 "stmfd sp!, {r1, r2, r3}\n"
136 ".save {r1, r2, r3}\n"
137 CFI(".cfi_def_cfa_offset 12\n")
138 CFI(".cfi_offset r3, -4\n")
139 CFI(".cfi_offset r2, -8\n")
140 CFI(".cfi_offset r1, -12\n")
141 "mov r2, sp\n"
142 "str lr, [sp, #-4]!\n"
143 ".save {lr}\n"
144 CFI(".cfi_def_cfa_offset 16\n")
145 CFI(".cfi_offset lr, -16\n")
146 "mov r1, ip\n"
147 "bl _PrepareAndDispatch\n"
148 "ldr pc, [sp], #16\n"
149 CFI(".cfi_endproc\n")
150 ".fnend");
152 /*
153 * Create sets of stubs to call the SharedStub.
154 * We don't touch the stack here, nor any registers, other than IP.
155 * IP is defined to be corruptable by a called function, so we are
156 * safe to use it.
157 *
158 * This will work with or without optimisation.
159 */
161 /*
162 * Note : As G++3 ABI contains the length of the functionname in the
163 * mangled name, it is difficult to get a generic assembler mechanism like
164 * in the G++ 2.95 case.
165 * Create names would be like :
166 * _ZN14nsXPTCStubBase5Stub9Ev
167 * _ZN14nsXPTCStubBase6Stub13Ev
168 * _ZN14nsXPTCStubBase7Stub144Ev
169 * Use the assembler directives to get the names right...
170 */
172 #define STUB_ENTRY(n) \
173 __asm__( \
174 ".section \".text\"\n" \
175 " .align 2\n" \
176 " .iflt ("#n" - 10)\n" \
177 " .globl _ZN14nsXPTCStubBase5Stub"#n"Ev\n" \
178 " .type _ZN14nsXPTCStubBase5Stub"#n"Ev,#function\n" \
179 "_ZN14nsXPTCStubBase5Stub"#n"Ev:\n" \
180 " .else\n" \
181 " .iflt ("#n" - 100)\n" \
182 " .globl _ZN14nsXPTCStubBase6Stub"#n"Ev\n" \
183 " .type _ZN14nsXPTCStubBase6Stub"#n"Ev,#function\n" \
184 "_ZN14nsXPTCStubBase6Stub"#n"Ev:\n" \
185 " .else\n" \
186 " .iflt ("#n" - 1000)\n" \
187 " .globl _ZN14nsXPTCStubBase7Stub"#n"Ev\n" \
188 " .type _ZN14nsXPTCStubBase7Stub"#n"Ev,#function\n" \
189 "_ZN14nsXPTCStubBase7Stub"#n"Ev:\n" \
190 " .else\n" \
191 " .err \"stub number "#n"> 1000 not yet supported\"\n" \
192 " .endif\n" \
193 " .endif\n" \
194 " .endif\n" \
195 " mov ip, #"#n"\n" \
196 " b SharedStub\n\t");
198 #if 0
199 /*
200 * This part is left in as comment : this is how the method definition
201 * should look like.
202 */
204 #define STUB_ENTRY(n) \
205 nsresult nsXPTCStubBase::Stub##n () \
206 { \
207 __asm__ ( \
208 " mov ip, #"#n"\n" \
209 " b SharedStub\n\t"); \
210 return 0; /* avoid warnings */ \
211 }
212 #endif
215 #define SENTINEL_ENTRY(n) \
216 nsresult nsXPTCStubBase::Sentinel##n() \
217 { \
218 NS_ERROR("nsXPTCStubBase::Sentinel called"); \
219 return NS_ERROR_NOT_IMPLEMENTED; \
220 }
222 #include "xptcstubsdef.inc"
