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 #include "xptcprivate.h"
7
8 #ifndef __AARCH64EL__
9 #error "Only little endian compatibility was tested"
10 #endif
11
12 template<typename T> void
get_value_and_advance(T * aOutValue,void * & aStack)13 get_value_and_advance(T* aOutValue, void*& aStack) {
14 #ifdef __APPLE__
15 const size_t aligned_size = sizeof(T);
16 #else
17 const size_t aligned_size = 8;
18 #endif
19 // Ensure the pointer is aligned for the type
20 uintptr_t addr = (reinterpret_cast<uintptr_t>(aStack) + aligned_size - 1) & ~(aligned_size - 1);
21 memcpy(aOutValue, reinterpret_cast<void*>(addr), sizeof(T));
22 aStack = reinterpret_cast<void*>(addr + aligned_size);
23 }
24
25 /*
26 * This is for AArch64 ABI
27 *
28 * When we're called, the "gp" registers are stored in gprData and
29 * the "fp" registers are stored in fprData. Each array has 8 regs
30 * but first reg in gprData is a placeholder for 'self'.
31 */
32 extern "C" nsresult ATTRIBUTE_USED
PrepareAndDispatch(nsXPTCStubBase * self,uint32_t methodIndex,void * args,uint64_t * gprData,double * fprData)33 PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, void* args,
34 uint64_t *gprData, double *fprData)
35 {
36 #define PARAM_GPR_COUNT 8
37 #define PARAM_FPR_COUNT 8
38
39 nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
40 const nsXPTMethodInfo* info;
41
42 NS_ASSERTION(self,"no self");
43
44 self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info);
45 NS_ASSERTION(info,"no method info");
46
47 uint32_t paramCount = info->GetParamCount();
48
49 const uint8_t indexOfJSContext = info->IndexOfJSContext();
50
51 void* ap = args;
52 uint32_t next_gpr = 1; // skip first arg which is 'self'
53 uint32_t next_fpr = 0;
54 for (uint32_t i = 0; i < paramCount; i++) {
55 const nsXPTParamInfo& param = info->GetParam(i);
56 const nsXPTType& type = param.GetType();
57 nsXPTCMiniVariant* dp = ¶mBuffer[i];
58
59 if (i == indexOfJSContext) {
60 if (next_gpr < PARAM_GPR_COUNT)
61 next_gpr++;
62 else {
63 void* value;
64 get_value_and_advance(&value, ap);
65 }
66 }
67
68 if (param.IsOut() || !type.IsArithmetic()) {
69 if (next_gpr < PARAM_GPR_COUNT) {
70 dp->val.p = (void*)gprData[next_gpr++];
71 } else {
72 get_value_and_advance(&dp->val.p, ap);
73 }
74 continue;
75 }
76
77 switch (type) {
78 case nsXPTType::T_I8:
79 if (next_gpr < PARAM_GPR_COUNT) {
80 dp->val.i8 = (int8_t)gprData[next_gpr++];
81 } else {
82 get_value_and_advance(&dp->val.i8, ap);
83 }
84 break;
85
86 case nsXPTType::T_I16:
87 if (next_gpr < PARAM_GPR_COUNT) {
88 dp->val.i16 = (int16_t)gprData[next_gpr++];
89 } else {
90 get_value_and_advance(&dp->val.i16, ap);
91 }
92 break;
93
94 case nsXPTType::T_I32:
95 if (next_gpr < PARAM_GPR_COUNT) {
96 dp->val.i32 = (int32_t)gprData[next_gpr++];
97 } else {
98 get_value_and_advance(&dp->val.i32, ap);
99 }
100 break;
101
102 case nsXPTType::T_I64:
103 if (next_gpr < PARAM_GPR_COUNT) {
104 dp->val.i64 = (int64_t)gprData[next_gpr++];
105 } else {
106 get_value_and_advance(&dp->val.i64, ap);
107 }
108 break;
109
110 case nsXPTType::T_U8:
111 if (next_gpr < PARAM_GPR_COUNT) {
112 dp->val.u8 = (uint8_t)gprData[next_gpr++];
113 } else {
114 get_value_and_advance(&dp->val.u8, ap);
115 }
116 break;
117
118 case nsXPTType::T_U16:
119 if (next_gpr < PARAM_GPR_COUNT) {
120 dp->val.u16 = (uint16_t)gprData[next_gpr++];
121 } else {
122 get_value_and_advance(&dp->val.u16, ap);
123 }
124 break;
125
126 case nsXPTType::T_U32:
127 if (next_gpr < PARAM_GPR_COUNT) {
128 dp->val.u32 = (uint32_t)gprData[next_gpr++];
129 } else {
130 get_value_and_advance(&dp->val.u32, ap);
131 }
132 break;
133
134 case nsXPTType::T_U64:
135 if (next_gpr < PARAM_GPR_COUNT) {
136 dp->val.u64 = (uint64_t)gprData[next_gpr++];
137 } else {
138 get_value_and_advance(&dp->val.u64, ap);
139 }
140 break;
141
142 case nsXPTType::T_FLOAT:
143 if (next_fpr < PARAM_FPR_COUNT) {
144 memcpy(&dp->val.f, &fprData[next_fpr++], sizeof(dp->val.f));
145 } else {
146 get_value_and_advance(&dp->val.f, ap);
147 }
148 break;
149
150 case nsXPTType::T_DOUBLE:
151 if (next_fpr < PARAM_FPR_COUNT) {
152 memcpy(&dp->val.d, &fprData[next_fpr++], sizeof(dp->val.d));
153 } else {
154 get_value_and_advance(&dp->val.d, ap);
155 }
156 break;
157
158 case nsXPTType::T_BOOL:
159 if (next_gpr < PARAM_GPR_COUNT) {
160 dp->val.b = (bool)(uint8_t)gprData[next_gpr++];
161 } else {
162 uint8_t value;
163 get_value_and_advance(&value, ap);
164 dp->val.b = (bool)value;
165 }
166 break;
167
168 case nsXPTType::T_CHAR:
169 if (next_gpr < PARAM_GPR_COUNT) {
170 dp->val.c = (char)gprData[next_gpr++];
171 } else {
172 get_value_and_advance(&dp->val.c, ap);
173 }
174 break;
175
176 case nsXPTType::T_WCHAR:
177 if (next_gpr < PARAM_GPR_COUNT) {
178 dp->val.wc = (wchar_t)gprData[next_gpr++];
179 } else {
180 get_value_and_advance(&dp->val.wc, ap);
181 }
182 break;
183
184 default:
185 NS_ASSERTION(0, "bad type");
186 break;
187 }
188 }
189
190 nsresult result = self->mOuter->CallMethod((uint16_t)methodIndex, info,
191 paramBuffer);
192
193 return result;
194 }
195
196 #ifdef __APPLE__
197 #define GNU(str)
198 #define UNDERSCORE "__"
199 #else
200 #define GNU(str) str
201 #define UNDERSCORE "_"
202 #endif
203
204 // Load w17 with the constant 'n' and branch to SharedStub().
205 # define STUB_ENTRY(n) \
206 __asm__ ( \
207 ".text\n\t" \
208 ".align 2\n\t" \
209 ".if "#n" < 10 \n\t" \
210 ".globl " UNDERSCORE "ZN14nsXPTCStubBase5Stub"#n"Ev \n\t" \
211 GNU(".hidden _ZN14nsXPTCStubBase5Stub"#n"Ev \n\t") \
212 GNU(".type _ZN14nsXPTCStubBase5Stub"#n"Ev,@function \n\n")\
213 "" UNDERSCORE "ZN14nsXPTCStubBase5Stub"#n"Ev: \n\t" \
214 ".elseif "#n" < 100 \n\t" \
215 ".globl " UNDERSCORE "ZN14nsXPTCStubBase6Stub"#n"Ev \n\t" \
216 GNU(".hidden _ZN14nsXPTCStubBase6Stub"#n"Ev \n\t") \
217 GNU(".type _ZN14nsXPTCStubBase6Stub"#n"Ev,@function \n\n")\
218 "" UNDERSCORE "ZN14nsXPTCStubBase6Stub"#n"Ev: \n\t" \
219 ".elseif "#n" < 1000 \n\t" \
220 ".globl " UNDERSCORE "ZN14nsXPTCStubBase7Stub"#n"Ev \n\t" \
221 GNU(".hidden _ZN14nsXPTCStubBase7Stub"#n"Ev \n\t") \
222 GNU(".type _ZN14nsXPTCStubBase7Stub"#n"Ev,@function \n\n")\
223 UNDERSCORE "ZN14nsXPTCStubBase7Stub"#n"Ev: \n\t" \
224 ".else \n\t" \
225 ".err \"stub number "#n" >= 1000 not yet supported\"\n" \
226 ".endif \n\t" \
227 "mov w17,#"#n" \n\t" \
228 "b SharedStub \n" \
229 );
230
231 #define SENTINEL_ENTRY(n) \
232 nsresult nsXPTCStubBase::Sentinel##n() \
233 { \
234 NS_ASSERTION(0,"nsXPTCStubBase::Sentinel called"); \
235 return NS_ERROR_NOT_IMPLEMENTED; \
236 }
237
238 #include "xptcstubsdef.inc"
239