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comparison: xpcom/reflect/xptcall/src/md/unix/xptcstubs_ppc_linux.cpp
xpcom/reflect/xptcall/src/md/unix/xptcstubs_ppc_linux.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:3c474077dc0e |
|---|---|
| 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/. */ | |
| 5 | |
| 6 // Implement shared vtbl methods. | |
| 7 | |
| 8 #include "xptcprivate.h" | |
| 9 #include "xptiprivate.h" | |
| 10 | |
| 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. | |
| 33 | |
| 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; | |
| 47 | |
| 48 NS_ASSERTION(self,"no self"); | |
| 49 | |
| 50 self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info); | |
| 51 NS_ASSERTION(info,"no method info"); | |
| 52 if (! info) | |
| 53 return NS_ERROR_UNEXPECTED; | |
| 54 | |
| 55 paramCount = info->GetParamCount(); | |
| 56 | |
| 57 // setup variant array pointer | |
| 58 if(paramCount > PARAM_BUFFER_COUNT) | |
| 59 dispatchParams = new nsXPTCMiniVariant[paramCount]; | |
| 60 else | |
| 61 dispatchParams = paramBuffer; | |
| 62 | |
| 63 NS_ASSERTION(dispatchParams,"no place for params"); | |
| 64 if (! dispatchParams) | |
| 65 return NS_ERROR_OUT_OF_MEMORY; | |
| 66 | |
| 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; | |
| 74 | |
| 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]; | |
| 79 | |
| 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 } | |
| 130 | |
| 131 if(param.IsOut() || !type.IsArithmetic()) { | |
| 132 dp->val.p = (void*) tempu32; | |
| 133 continue; | |
| 134 } | |
| 135 | |
| 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; | |
| 148 | |
| 149 default: | |
| 150 NS_ERROR("bad type"); | |
| 151 break; | |
| 152 } | |
| 153 } | |
| 154 | |
| 155 result = self->mOuter->CallMethod((uint16_t)methodIndex, | |
| 156 info, | |
| 157 dispatchParams); | |
| 158 | |
| 159 if (dispatchParams != paramBuffer) | |
| 160 delete [] dispatchParams; | |
| 161 | |
| 162 return result; | |
| 163 } | |
| 164 | |
| 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 ;-). | |
| 170 | |
| 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... | |
| 183 | |
| 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 ); | |
| 209 | |
| 210 #define SENTINEL_ENTRY(n) \ | |
| 211 nsresult nsXPTCStubBase::Sentinel##n() \ | |
| 212 { \ | |
| 213 NS_ERROR("nsXPTCStubBase::Sentinel called"); \ | |
| 214 return NS_ERROR_NOT_IMPLEMENTED; \ | |
| 215 } | |
| 216 | |
| 217 #include "xptcstubsdef.inc" |
