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