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1 : /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 : *
3 : * This Source Code Form is subject to the terms of the Mozilla Public
4 : * License, v. 2.0. If a copy of the MPL was not distributed with this
5 : * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6 :
7 : // Implement shared vtbl methods.
8 :
9 : // Keep this in sync with the darwin version.
10 :
11 : #include "xptcprivate.h"
12 : #include "xptiprivate.h"
13 :
14 : // The Linux/x86-64 ABI passes the first 6 integer parameters and the
15 : // first 8 floating point parameters in registers (rdi, rsi, rdx, rcx,
16 : // r8, r9 and xmm0-xmm7), no stack space is allocated for these by the
17 : // caller. The rest of the parameters are passed in the callers stack
18 : // area.
19 :
20 : const uint32_t PARAM_BUFFER_COUNT = 16;
21 : const uint32_t GPR_COUNT = 6;
22 : const uint32_t FPR_COUNT = 8;
23 :
24 : // PrepareAndDispatch() is called by SharedStub() and calls the actual method.
25 : //
26 : // - 'args[]' contains the arguments passed on stack
27 : // - 'gpregs[]' contains the arguments passed in integer registers
28 : // - 'fpregs[]' contains the arguments passed in floating point registers
29 : //
30 : // The parameters are mapped into an array of type 'nsXPTCMiniVariant'
31 : // and then the method gets called.
32 :
33 : extern "C" nsresult ATTRIBUTE_USED
34 680 : PrepareAndDispatch(nsXPTCStubBase * self, uint32_t methodIndex,
35 : uint64_t * args, uint64_t * gpregs, double *fpregs)
36 : {
37 680 : nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
38 680 : nsXPTCMiniVariant* dispatchParams = nullptr;
39 : const nsXPTMethodInfo* info;
40 : uint32_t paramCount;
41 : uint32_t i;
42 680 : nsresult result = NS_ERROR_FAILURE;
43 :
44 680 : NS_ASSERTION(self,"no self");
45 :
46 680 : self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info);
47 680 : NS_ASSERTION(info,"no method info");
48 680 : if (!info)
49 0 : return NS_ERROR_UNEXPECTED;
50 :
51 680 : paramCount = info->GetParamCount();
52 :
53 : // setup variant array pointer
54 680 : if (paramCount > PARAM_BUFFER_COUNT)
55 0 : dispatchParams = new nsXPTCMiniVariant[paramCount];
56 : else
57 680 : dispatchParams = paramBuffer;
58 :
59 680 : NS_ASSERTION(dispatchParams,"no place for params");
60 680 : if (!dispatchParams)
61 0 : return NS_ERROR_OUT_OF_MEMORY;
62 :
63 680 : uint64_t* ap = args;
64 680 : uint32_t nr_gpr = 1; // skip one GPR register for 'that'
65 680 : uint32_t nr_fpr = 0;
66 : uint64_t value;
67 :
68 2277 : for (i = 0; i < paramCount; i++) {
69 1597 : const nsXPTParamInfo& param = info->GetParam(i);
70 1597 : const nsXPTType& type = param.GetType();
71 1597 : nsXPTCMiniVariant* dp = &dispatchParams[i];
72 :
73 1597 : if (!param.IsOut() && type == nsXPTType::T_DOUBLE) {
74 0 : if (nr_fpr < FPR_COUNT)
75 0 : dp->val.d = fpregs[nr_fpr++];
76 : else
77 0 : dp->val.d = *(double*)ap++;
78 0 : continue;
79 : }
80 1597 : if (!param.IsOut() && type == nsXPTType::T_FLOAT) {
81 0 : if (nr_fpr < FPR_COUNT)
82 : // The value in %xmm register is already prepared to
83 : // be retrieved as a float. Therefore, we pass the
84 : // value verbatim, as a double without conversion.
85 0 : dp->val.d = fpregs[nr_fpr++];
86 : else
87 0 : dp->val.f = *(float*)ap++;
88 0 : continue;
89 : }
90 1597 : if (nr_gpr < GPR_COUNT)
91 1570 : value = gpregs[nr_gpr++];
92 : else
93 27 : value = *ap++;
94 :
95 1597 : if (param.IsOut() || !type.IsArithmetic()) {
96 1466 : dp->val.p = (void*) value;
97 1466 : continue;
98 : }
99 :
100 131 : switch (type) {
101 0 : case nsXPTType::T_I8: dp->val.i8 = (int8_t) value; break;
102 0 : case nsXPTType::T_I16: dp->val.i16 = (int16_t) value; break;
103 28 : case nsXPTType::T_I32: dp->val.i32 = (int32_t) value; break;
104 18 : case nsXPTType::T_I64: dp->val.i64 = (int64_t) value; break;
105 0 : case nsXPTType::T_U8: dp->val.u8 = (uint8_t) value; break;
106 10 : case nsXPTType::T_U16: dp->val.u16 = (uint16_t) value; break;
107 65 : case nsXPTType::T_U32: dp->val.u32 = (uint32_t) value; break;
108 0 : case nsXPTType::T_U64: dp->val.u64 = (uint64_t) value; break;
109 : // Cast to uint8_t first, to remove garbage on upper 56 bits.
110 10 : case nsXPTType::T_BOOL: dp->val.b = (bool)(uint8_t) value; break;
111 0 : case nsXPTType::T_CHAR: dp->val.c = (char) value; break;
112 0 : case nsXPTType::T_WCHAR: dp->val.wc = (wchar_t) value; break;
113 :
114 : default:
115 0 : NS_ERROR("bad type");
116 0 : break;
117 : }
118 : }
119 :
120 680 : result = self->mOuter->CallMethod((uint16_t) methodIndex, info, dispatchParams);
121 :
122 680 : if (dispatchParams != paramBuffer)
123 0 : delete [] dispatchParams;
124 :
125 680 : return result;
126 : }
127 :
128 : // Linux/x86-64 uses gcc >= 3.1
129 : // We don't include .cfi_startproc/endproc directives for the individual stubs
130 : // because there's no extra CFI bits to define beyond the default CIE.
131 : #define STUB_ENTRY(n) \
132 : asm(".section \".text\"\n\t" \
133 : ".align 2\n\t" \
134 : ".if " #n " < 10\n\t" \
135 : ".globl _ZN14nsXPTCStubBase5Stub" #n "Ev\n\t" \
136 : ".hidden _ZN14nsXPTCStubBase5Stub" #n "Ev\n\t" \
137 : ".type _ZN14nsXPTCStubBase5Stub" #n "Ev,@function\n" \
138 : "_ZN14nsXPTCStubBase5Stub" #n "Ev:\n\t" \
139 : ".elseif " #n " < 100\n\t" \
140 : ".globl _ZN14nsXPTCStubBase6Stub" #n "Ev\n\t" \
141 : ".hidden _ZN14nsXPTCStubBase6Stub" #n "Ev\n\t" \
142 : ".type _ZN14nsXPTCStubBase6Stub" #n "Ev,@function\n" \
143 : "_ZN14nsXPTCStubBase6Stub" #n "Ev:\n\t" \
144 : ".elseif " #n " < 1000\n\t" \
145 : ".globl _ZN14nsXPTCStubBase7Stub" #n "Ev\n\t" \
146 : ".hidden _ZN14nsXPTCStubBase7Stub" #n "Ev\n\t" \
147 : ".type _ZN14nsXPTCStubBase7Stub" #n "Ev,@function\n" \
148 : "_ZN14nsXPTCStubBase7Stub" #n "Ev:\n\t" \
149 : ".else\n\t" \
150 : ".err \"stub number " #n " >= 1000 not yet supported\"\n\t" \
151 : ".endif\n\t" \
152 : "movl $" #n ", %eax\n\t" \
153 : "jmp SharedStub\n\t" \
154 : ".if " #n " < 10\n\t" \
155 : ".size _ZN14nsXPTCStubBase5Stub" #n "Ev,.-_ZN14nsXPTCStubBase5Stub" #n "Ev\n\t" \
156 : ".elseif " #n " < 100\n\t" \
157 : ".size _ZN14nsXPTCStubBase6Stub" #n "Ev,.-_ZN14nsXPTCStubBase6Stub" #n "Ev\n\t" \
158 : ".else\n\t" \
159 : ".size _ZN14nsXPTCStubBase7Stub" #n "Ev,.-_ZN14nsXPTCStubBase7Stub" #n "Ev\n\t" \
160 : ".endif");
161 :
162 : // static nsresult SharedStub(uint32_t methodIndex)
163 : asm(".section \".text\"\n\t"
164 : ".align 2\n\t"
165 : ".type SharedStub,@function\n\t"
166 : "SharedStub:\n\t"
167 : ".cfi_startproc\n\t"
168 : // make room for gpregs (48), fpregs (64)
169 : "pushq %rbp\n\t"
170 : ".cfi_def_cfa_offset 16\n\t"
171 : ".cfi_offset 6, -16\n\t"
172 : "movq %rsp,%rbp\n\t"
173 : ".cfi_def_cfa_register 6\n\t"
174 : "subq $112,%rsp\n\t"
175 : // save GP registers
176 : "movq %rdi,-112(%rbp)\n\t"
177 : "movq %rsi,-104(%rbp)\n\t"
178 : "movq %rdx, -96(%rbp)\n\t"
179 : "movq %rcx, -88(%rbp)\n\t"
180 : "movq %r8 , -80(%rbp)\n\t"
181 : "movq %r9 , -72(%rbp)\n\t"
182 : ".cfi_offset 5, -24\n\t" // rdi
183 : ".cfi_offset 4, -32\n\t" // rsi
184 : ".cfi_offset 1, -40\n\t" // rdx
185 : ".cfi_offset 2, -48\n\t" // rcx
186 : ".cfi_offset 8, -56\n\t" // r8
187 : ".cfi_offset 9, -64\n\t" // r9
188 : "leaq -112(%rbp),%rcx\n\t"
189 : // save FP registers
190 : "movsd %xmm0,-64(%rbp)\n\t"
191 : "movsd %xmm1,-56(%rbp)\n\t"
192 : "movsd %xmm2,-48(%rbp)\n\t"
193 : "movsd %xmm3,-40(%rbp)\n\t"
194 : "movsd %xmm4,-32(%rbp)\n\t"
195 : "movsd %xmm5,-24(%rbp)\n\t"
196 : "movsd %xmm6,-16(%rbp)\n\t"
197 : "movsd %xmm7, -8(%rbp)\n\t"
198 : "leaq -64(%rbp),%r8\n\t"
199 : // rdi has the 'self' pointer already
200 : "movl %eax,%esi\n\t"
201 : "leaq 16(%rbp),%rdx\n\t"
202 : "call PrepareAndDispatch@plt\n\t"
203 : "leave\n\t"
204 : ".cfi_def_cfa 7, 8\n\t"
205 : "ret\n\t"
206 : ".cfi_endproc\n\t"
207 : ".size SharedStub,.-SharedStub");
208 :
209 : #define SENTINEL_ENTRY(n) \
210 : nsresult nsXPTCStubBase::Sentinel##n() \
211 : { \
212 : NS_ERROR("nsXPTCStubBase::Sentinel called"); \
213 : return NS_ERROR_NOT_IMPLEMENTED; \
214 : }
215 :
216 : #include "xptcstubsdef.inc"
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