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
10 /* Prototype specifies unmangled function name and disables unused warning */
11 static nsresult
12 PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, uint64_t* args)
13 __asm__("PrepareAndDispatch") ATTRIBUTE_USED;
14
15 static nsresult
PrepareAndDispatch(nsXPTCStubBase * self,uint32_t methodIndex,uint64_t * args)16 PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, uint64_t* args)
17 {
18 const uint8_t PARAM_BUFFER_COUNT = 16;
19 const uint8_t NUM_ARG_REGS = 6-1; // -1 for "this" pointer
20
21 nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
22 nsXPTCMiniVariant* dispatchParams = nullptr;
23 const nsXPTMethodInfo* info;
24 uint8_t paramCount;
25 uint8_t i;
26
27 NS_ASSERTION(self,"no self");
28
29 self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info);
30
31 paramCount = info->GetParamCount();
32
33 // setup variant array pointer
34 if(paramCount > PARAM_BUFFER_COUNT)
35 dispatchParams = new nsXPTCMiniVariant[paramCount];
36 else
37 dispatchParams = paramBuffer;
38 NS_ASSERTION(dispatchParams,"no place for params");
39
40 const uint8_t indexOfJSContext = info->IndexOfJSContext();
41
42 // args[0] to args[NUM_ARG_REGS] hold floating point register values
43 uint64_t* ap = args + NUM_ARG_REGS;
44 for(i = 0; i < paramCount; i++, ap++)
45 {
46 const nsXPTParamInfo& param = info->GetParam(i);
47 const nsXPTType& type = param.GetType();
48 nsXPTCMiniVariant* dp = &dispatchParams[i];
49
50 if (i == indexOfJSContext)
51 ap++;
52
53 if(param.IsOut() || !type.IsArithmetic())
54 {
55 dp->val.p = (void*) *ap;
56 continue;
57 }
58 // else
59 switch(type)
60 {
61 case nsXPTType::T_I8 : dp->val.i8 = (int8_t) *ap; break;
62 case nsXPTType::T_I16 : dp->val.i16 = (int16_t) *ap; break;
63 case nsXPTType::T_I32 : dp->val.i32 = (int32_t) *ap; break;
64 case nsXPTType::T_I64 : dp->val.i64 = (int64_t) *ap; break;
65 case nsXPTType::T_U8 : dp->val.u8 = (uint8_t) *ap; break;
66 case nsXPTType::T_U16 : dp->val.u16 = (uint16_t) *ap; break;
67 case nsXPTType::T_U32 : dp->val.u32 = (uint32_t) *ap; break;
68 case nsXPTType::T_U64 : dp->val.u64 = (uint64_t) *ap; break;
69 case nsXPTType::T_FLOAT :
70 if(i < NUM_ARG_REGS)
71 {
72 // floats passed via registers are stored as doubles
73 // in the first NUM_ARG_REGS entries in args
74 dp->val.u64 = (uint64_t) args[i];
75 dp->val.f = (float) dp->val.d; // convert double to float
76 }
77 else
78 dp->val.u32 = (uint32_t) *ap;
79 break;
80 case nsXPTType::T_DOUBLE :
81 // doubles passed via registers are also stored
82 // in the first NUM_ARG_REGS entries in args
83 dp->val.u64 = (i < NUM_ARG_REGS) ? args[i] : *ap;
84 break;
85 case nsXPTType::T_BOOL : dp->val.b = (bool) *ap; break;
86 case nsXPTType::T_CHAR : dp->val.c = (char) *ap; break;
87 case nsXPTType::T_WCHAR : dp->val.wc = (char16_t) *ap; break;
88 default:
89 NS_ERROR("bad type");
90 break;
91 }
92 }
93
94 nsresult result = self->mOuter->CallMethod((uint16_t)methodIndex, info,
95 dispatchParams);
96
97 if(dispatchParams != paramBuffer)
98 delete [] dispatchParams;
99
100 return result;
101 }
102
103 /*
104 * SharedStub()
105 * Collects arguments and calls PrepareAndDispatch. The "methodIndex" is
106 * passed to this function via $1 to preserve the argument registers.
107 */
108 __asm__(
109 "#### SharedStub ####\n"
110 ".text\n\t"
111 ".align 5\n\t"
112 ".ent SharedStub\n"
113 "SharedStub:\n\t"
114 ".frame $30,96,$26,0\n\t"
115 ".mask 0x4000000,-96\n\t"
116 "ldgp $29,0($27)\n"
117 "$SharedStub..ng:\n\t"
118 "subq $30,96,$30\n\t"
119 "stq $26,0($30)\n\t"
120 ".prologue 1\n\t"
121
122 /*
123 * Store arguments passed via registers to the stack.
124 * Floating point registers are stored as doubles and converted
125 * to floats in PrepareAndDispatch if necessary.
126 */
127 "stt $f17,16($30)\n\t" /* floating point registers */
128 "stt $f18,24($30)\n\t"
129 "stt $f19,32($30)\n\t"
130 "stt $f20,40($30)\n\t"
131 "stt $f21,48($30)\n\t"
132 "stq $17,56($30)\n\t" /* integer registers */
133 "stq $18,64($30)\n\t"
134 "stq $19,72($30)\n\t"
135 "stq $20,80($30)\n\t"
136 "stq $21,88($30)\n\t"
137
138 /*
139 * Call PrepareAndDispatch function.
140 */
141 "bis $1,$1,$17\n\t" /* pass "methodIndex" */
142 "addq $30,16,$18\n\t" /* pass "args" */
143 "bsr $26,$PrepareAndDispatch..ng\n\t"
144
145 "ldq $26,0($30)\n\t"
146 "addq $30,96,$30\n\t"
147 "ret $31,($26),1\n\t"
148 ".end SharedStub"
149 );
150
151 /*
152 * nsresult nsXPTCStubBase::Stub##n()
153 * Sets register $1 to "methodIndex" and jumps to SharedStub.
154 */
155 #define STUB_MANGLED_ENTRY(n, symbol) \
156 "#### Stub"#n" ####" "\n\t" \
157 ".text" "\n\t" \
158 ".align 5" "\n\t" \
159 ".globl " symbol "\n\t" \
160 ".ent " symbol "\n" \
161 symbol ":" "\n\t" \
162 ".frame $30,0,$26,0" "\n\t" \
163 "ldgp $29,0($27)" "\n" \
164 "$" symbol "..ng:" "\n\t" \
165 ".prologue 1" "\n\t" \
166 "lda $1,"#n "\n\t" \
167 "br $31,$SharedStub..ng" "\n\t" \
168 ".end " symbol
169
170 #define STUB_ENTRY(n) \
171 __asm__( \
172 ".if "#n" < 10" "\n\t" \
173 STUB_MANGLED_ENTRY(n, "_ZN14nsXPTCStubBase5Stub"#n"Ev") "\n\t" \
174 ".elseif "#n" < 100" "\n\t" \
175 STUB_MANGLED_ENTRY(n, "_ZN14nsXPTCStubBase6Stub"#n"Ev") "\n\t" \
176 ".elseif "#n" < 1000" "\n\t" \
177 STUB_MANGLED_ENTRY(n, "_ZN14nsXPTCStubBase7Stub"#n"Ev") "\n\t" \
178 ".else" "\n\t" \
179 ".err \"Stub"#n" >= 1000 not yet supported.\"" "\n\t" \
180 ".endif" \
181 );
182
183
184 #define SENTINEL_ENTRY(n) \
185 nsresult nsXPTCStubBase::Sentinel##n() \
186 { \
187 NS_ERROR("nsXPTCStubBase::Sentinel called"); \
188 return NS_ERROR_NOT_IMPLEMENTED; \
189 }
190
191 #include "xptcstubsdef.inc"
192