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xpcom/reflect/xptcall/src/md/unix/xptcstubs_x86_64_linux.cpp@6474c204b198 (annotated)

xpcom/reflect/xptcall/src/md/unix/xptcstubs_x86_64_linux.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Wed, 31 Dec 2014 06:09:35 +0100
changeset 0
6474c204b198
permissions
-rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

michael@0 1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0 2 *
michael@0 3 * This Source Code Form is subject to the terms of the Mozilla Public
michael@0 4 * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0 6
michael@0 7 // Implement shared vtbl methods.
michael@0 8
michael@0 9 // Keep this in sync with the darwin version.
michael@0 10
michael@0 11 #include "xptcprivate.h"
michael@0 12 #include "xptiprivate.h"
michael@0 13
michael@0 14 // The Linux/x86-64 ABI passes the first 6 integer parameters and the
michael@0 15 // first 8 floating point parameters in registers (rdi, rsi, rdx, rcx,
michael@0 16 // r8, r9 and xmm0-xmm7), no stack space is allocated for these by the
michael@0 17 // caller. The rest of the parameters are passed in the callers stack
michael@0 18 // area.
michael@0 19
michael@0 20 const uint32_t PARAM_BUFFER_COUNT = 16;
michael@0 21 const uint32_t GPR_COUNT = 6;
michael@0 22 const uint32_t FPR_COUNT = 8;
michael@0 23
michael@0 24 // PrepareAndDispatch() is called by SharedStub() and calls the actual method.
michael@0 25 //
michael@0 26 // - 'args[]' contains the arguments passed on stack
michael@0 27 // - 'gpregs[]' contains the arguments passed in integer registers
michael@0 28 // - 'fpregs[]' contains the arguments passed in floating point registers
michael@0 29 //
michael@0 30 // The parameters are mapped into an array of type 'nsXPTCMiniVariant'
michael@0 31 // and then the method gets called.
michael@0 32
michael@0 33 extern "C" nsresult ATTRIBUTE_USED
michael@0 34 PrepareAndDispatch(nsXPTCStubBase * self, uint32_t methodIndex,
michael@0 35 uint64_t * args, uint64_t * gpregs, double *fpregs)
michael@0 36 {
michael@0 37 nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
michael@0 38 nsXPTCMiniVariant* dispatchParams = nullptr;
michael@0 39 const nsXPTMethodInfo* info;
michael@0 40 uint32_t paramCount;
michael@0 41 uint32_t i;
michael@0 42 nsresult result = NS_ERROR_FAILURE;
michael@0 43
michael@0 44 NS_ASSERTION(self,"no self");
michael@0 45
michael@0 46 self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info);
michael@0 47 NS_ASSERTION(info,"no method info");
michael@0 48 if (!info)
michael@0 49 return NS_ERROR_UNEXPECTED;
michael@0 50
michael@0 51 paramCount = info->GetParamCount();
michael@0 52
michael@0 53 // setup variant array pointer
michael@0 54 if (paramCount > PARAM_BUFFER_COUNT)
michael@0 55 dispatchParams = new nsXPTCMiniVariant[paramCount];
michael@0 56 else
michael@0 57 dispatchParams = paramBuffer;
michael@0 58
michael@0 59 NS_ASSERTION(dispatchParams,"no place for params");
michael@0 60 if (!dispatchParams)
michael@0 61 return NS_ERROR_OUT_OF_MEMORY;
michael@0 62
michael@0 63 uint64_t* ap = args;
michael@0 64 uint32_t nr_gpr = 1; // skip one GPR register for 'that'
michael@0 65 uint32_t nr_fpr = 0;
michael@0 66 uint64_t value;
michael@0 67
michael@0 68 for (i = 0; i < paramCount; i++) {
michael@0 69 const nsXPTParamInfo& param = info->GetParam(i);
michael@0 70 const nsXPTType& type = param.GetType();
michael@0 71 nsXPTCMiniVariant* dp = &dispatchParams[i];
michael@0 72
michael@0 73 if (!param.IsOut() && type == nsXPTType::T_DOUBLE) {
michael@0 74 if (nr_fpr < FPR_COUNT)
michael@0 75 dp->val.d = fpregs[nr_fpr++];
michael@0 76 else
michael@0 77 dp->val.d = *(double*) ap++;
michael@0 78 continue;
michael@0 79 }
michael@0 80 else if (!param.IsOut() && type == nsXPTType::T_FLOAT) {
michael@0 81 if (nr_fpr < FPR_COUNT)
michael@0 82 // The value in %xmm register is already prepared to
michael@0 83 // be retrieved as a float. Therefore, we pass the
michael@0 84 // value verbatim, as a double without conversion.
michael@0 85 dp->val.d = fpregs[nr_fpr++];
michael@0 86 else
michael@0 87 dp->val.f = *(float*) ap++;
michael@0 88 continue;
michael@0 89 }
michael@0 90 else {
michael@0 91 if (nr_gpr < GPR_COUNT)
michael@0 92 value = gpregs[nr_gpr++];
michael@0 93 else
michael@0 94 value = *ap++;
michael@0 95 }
michael@0 96
michael@0 97 if (param.IsOut() || !type.IsArithmetic()) {
michael@0 98 dp->val.p = (void*) value;
michael@0 99 continue;
michael@0 100 }
michael@0 101
michael@0 102 switch (type) {
michael@0 103 case nsXPTType::T_I8: dp->val.i8 = (int8_t) value; break;
michael@0 104 case nsXPTType::T_I16: dp->val.i16 = (int16_t) value; break;
michael@0 105 case nsXPTType::T_I32: dp->val.i32 = (int32_t) value; break;
michael@0 106 case nsXPTType::T_I64: dp->val.i64 = (int64_t) value; break;
michael@0 107 case nsXPTType::T_U8: dp->val.u8 = (uint8_t) value; break;
michael@0 108 case nsXPTType::T_U16: dp->val.u16 = (uint16_t) value; break;
michael@0 109 case nsXPTType::T_U32: dp->val.u32 = (uint32_t) value; break;
michael@0 110 case nsXPTType::T_U64: dp->val.u64 = (uint64_t) value; break;
michael@0 111 // Cast to uint8_t first, to remove garbage on upper 56 bits.
michael@0 112 case nsXPTType::T_BOOL: dp->val.b = (bool)(uint8_t) value; break;
michael@0 113 case nsXPTType::T_CHAR: dp->val.c = (char) value; break;
michael@0 114 case nsXPTType::T_WCHAR: dp->val.wc = (wchar_t) value; break;
michael@0 115
michael@0 116 default:
michael@0 117 NS_ERROR("bad type");
michael@0 118 break;
michael@0 119 }
michael@0 120 }
michael@0 121
michael@0 122 result = self->mOuter->CallMethod((uint16_t) methodIndex, info, dispatchParams);
michael@0 123
michael@0 124 if (dispatchParams != paramBuffer)
michael@0 125 delete [] dispatchParams;
michael@0 126
michael@0 127 return result;
michael@0 128 }
michael@0 129
michael@0 130 // Linux/x86-64 uses gcc >= 3.1
michael@0 131 #define STUB_ENTRY(n) \
michael@0 132 asm(".section \".text\"\n\t" \
michael@0 133 ".align 2\n\t" \
michael@0 134 ".if " #n " < 10\n\t" \
michael@0 135 ".globl _ZN14nsXPTCStubBase5Stub" #n "Ev\n\t" \
michael@0 136 ".hidden _ZN14nsXPTCStubBase5Stub" #n "Ev\n\t" \
michael@0 137 ".type _ZN14nsXPTCStubBase5Stub" #n "Ev,@function\n" \
michael@0 138 "_ZN14nsXPTCStubBase5Stub" #n "Ev:\n\t" \
michael@0 139 ".elseif " #n " < 100\n\t" \
michael@0 140 ".globl _ZN14nsXPTCStubBase6Stub" #n "Ev\n\t" \
michael@0 141 ".hidden _ZN14nsXPTCStubBase6Stub" #n "Ev\n\t" \
michael@0 142 ".type _ZN14nsXPTCStubBase6Stub" #n "Ev,@function\n" \
michael@0 143 "_ZN14nsXPTCStubBase6Stub" #n "Ev:\n\t" \
michael@0 144 ".elseif " #n " < 1000\n\t" \
michael@0 145 ".globl _ZN14nsXPTCStubBase7Stub" #n "Ev\n\t" \
michael@0 146 ".hidden _ZN14nsXPTCStubBase7Stub" #n "Ev\n\t" \
michael@0 147 ".type _ZN14nsXPTCStubBase7Stub" #n "Ev,@function\n" \
michael@0 148 "_ZN14nsXPTCStubBase7Stub" #n "Ev:\n\t" \
michael@0 149 ".else\n\t" \
michael@0 150 ".err \"stub number " #n " >= 1000 not yet supported\"\n\t" \
michael@0 151 ".endif\n\t" \
michael@0 152 "movl $" #n ", %eax\n\t" \
michael@0 153 "jmp SharedStub\n\t" \
michael@0 154 ".if " #n " < 10\n\t" \
michael@0 155 ".size _ZN14nsXPTCStubBase5Stub" #n "Ev,.-_ZN14nsXPTCStubBase5Stub" #n "Ev\n\t" \
michael@0 156 ".elseif " #n " < 100\n\t" \
michael@0 157 ".size _ZN14nsXPTCStubBase6Stub" #n "Ev,.-_ZN14nsXPTCStubBase6Stub" #n "Ev\n\t" \
michael@0 158 ".else\n\t" \
michael@0 159 ".size _ZN14nsXPTCStubBase7Stub" #n "Ev,.-_ZN14nsXPTCStubBase7Stub" #n "Ev\n\t" \
michael@0 160 ".endif");
michael@0 161
michael@0 162 // static nsresult SharedStub(uint32_t methodIndex)
michael@0 163 asm(".section \".text\"\n\t"
michael@0 164 ".align 2\n\t"
michael@0 165 ".type SharedStub,@function\n\t"
michael@0 166 "SharedStub:\n\t"
michael@0 167 // make room for gpregs (48), fpregs (64)
michael@0 168 "pushq %rbp\n\t"
michael@0 169 "movq %rsp,%rbp\n\t"
michael@0 170 "subq $112,%rsp\n\t"
michael@0 171 // save GP registers
michael@0 172 "movq %rdi,-112(%rbp)\n\t"
michael@0 173 "movq %rsi,-104(%rbp)\n\t"
michael@0 174 "movq %rdx, -96(%rbp)\n\t"
michael@0 175 "movq %rcx, -88(%rbp)\n\t"
michael@0 176 "movq %r8 , -80(%rbp)\n\t"
michael@0 177 "movq %r9 , -72(%rbp)\n\t"
michael@0 178 "leaq -112(%rbp),%rcx\n\t"
michael@0 179 // save FP registers
michael@0 180 "movsd %xmm0,-64(%rbp)\n\t"
michael@0 181 "movsd %xmm1,-56(%rbp)\n\t"
michael@0 182 "movsd %xmm2,-48(%rbp)\n\t"
michael@0 183 "movsd %xmm3,-40(%rbp)\n\t"
michael@0 184 "movsd %xmm4,-32(%rbp)\n\t"
michael@0 185 "movsd %xmm5,-24(%rbp)\n\t"
michael@0 186 "movsd %xmm6,-16(%rbp)\n\t"
michael@0 187 "movsd %xmm7, -8(%rbp)\n\t"
michael@0 188 "leaq -64(%rbp),%r8\n\t"
michael@0 189 // rdi has the 'self' pointer already
michael@0 190 "movl %eax,%esi\n\t"
michael@0 191 "leaq 16(%rbp),%rdx\n\t"
michael@0 192 "call PrepareAndDispatch@plt\n\t"
michael@0 193 "leave\n\t"
michael@0 194 "ret\n\t"
michael@0 195 ".size SharedStub,.-SharedStub");
michael@0 196
michael@0 197 #define SENTINEL_ENTRY(n) \
michael@0 198 nsresult nsXPTCStubBase::Sentinel##n() \
michael@0 199 { \
michael@0 200 NS_ERROR("nsXPTCStubBase::Sentinel called"); \
michael@0 201 return NS_ERROR_NOT_IMPLEMENTED; \
michael@0 202 }
michael@0 203
michael@0 204 #include "xptcstubsdef.inc"

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