xpcom/reflect/xptcall/src/md/unix/xptcinvoke_x86_64_solaris.cpp@129ffea94266
xpcom/reflect/xptcall/src/md/unix/xptcinvoke_x86_64_solaris.cpp
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
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/. */
7 // Platform specific code to invoke XPCOM methods on native objects
9 #include "xptcprivate.h"
10 #include "alloca.h"
12 // 6 integral parameters are passed in registers
13 const uint32_t GPR_COUNT = 6;
15 // 8 floating point parameters are passed in SSE registers
16 const uint32_t FPR_COUNT = 8;
18 // Remember that these 'words' are 64-bit long
19 static inline void
20 invoke_count_words(uint32_t paramCount, nsXPTCVariant * s,
21 uint32_t & nr_gpr, uint32_t & nr_fpr, uint32_t & nr_stack)
22 {
23 nr_gpr = 1; // skip one GP register for 'that'
24 nr_fpr = 0;
25 nr_stack = 0;
27 /* Compute number of eightbytes of class MEMORY. */
28 for (uint32_t i = 0; i < paramCount; i++, s++) {
29 if (!s->IsPtrData()
30 && (s->type == nsXPTType::T_FLOAT || s->type == nsXPTType::T_DOUBLE)) {
31 if (nr_fpr < FPR_COUNT)
32 nr_fpr++;
33 else
34 nr_stack++;
35 }
36 else {
37 if (nr_gpr < GPR_COUNT)
38 nr_gpr++;
39 else
40 nr_stack++;
41 }
42 }
43 }
45 static void
46 invoke_copy_to_stack(uint64_t * d, uint32_t paramCount, nsXPTCVariant * s,
47 uint64_t * gpregs, double * fpregs)
48 {
49 uint32_t nr_gpr = 1; // skip one GP register for 'that'
50 uint32_t nr_fpr = 0;
51 uint64_t value;
53 for (uint32_t i = 0; i < paramCount; i++, s++) {
54 if (s->IsPtrData())
55 value = (uint64_t) s->ptr;
56 else {
57 switch (s->type) {
58 case nsXPTType::T_FLOAT: break;
59 case nsXPTType::T_DOUBLE: break;
60 case nsXPTType::T_I8: value = s->val.i8; break;
61 case nsXPTType::T_I16: value = s->val.i16; break;
62 case nsXPTType::T_I32: value = s->val.i32; break;
63 case nsXPTType::T_I64: value = s->val.i64; break;
64 case nsXPTType::T_U8: value = s->val.u8; break;
65 case nsXPTType::T_U16: value = s->val.u16; break;
66 case nsXPTType::T_U32: value = s->val.u32; break;
67 case nsXPTType::T_U64: value = s->val.u64; break;
68 case nsXPTType::T_BOOL: value = s->val.b; break;
69 case nsXPTType::T_CHAR: value = s->val.c; break;
70 case nsXPTType::T_WCHAR: value = s->val.wc; break;
71 default: value = (uint64_t) s->val.p; break;
72 }
73 }
75 if (!s->IsPtrData() && s->type == nsXPTType::T_DOUBLE) {
76 if (nr_fpr < FPR_COUNT)
77 fpregs[nr_fpr++] = s->val.d;
78 else {
79 *((double *)d) = s->val.d;
80 d++;
81 }
82 }
83 else if (!s->IsPtrData() && s->type == nsXPTType::T_FLOAT) {
84 if (nr_fpr < FPR_COUNT)
85 // The value in %xmm register is already prepared to
86 // be retrieved as a float. Therefore, we pass the
87 // value verbatim, as a double without conversion.
88 fpregs[nr_fpr++] = s->val.d;
89 else {
90 *((float *)d) = s->val.f;
91 d++;
92 }
93 }
94 else {
95 if (nr_gpr < GPR_COUNT)
96 gpregs[nr_gpr++] = value;
97 else
98 *d++ = value;
99 }
100 }
101 }
103 EXPORT_XPCOM_API(nsresult)
104 NS_InvokeByIndex(nsISupports * that, uint32_t methodIndex,
105 uint32_t paramCount, nsXPTCVariant * params)
106 {
107 uint32_t nr_gpr, nr_fpr, nr_stack;
108 invoke_count_words(paramCount, params, nr_gpr, nr_fpr, nr_stack);
110 // Stack, if used, must be 16-bytes aligned
111 if (nr_stack)
112 nr_stack = (nr_stack + 1) & ~1;
114 // Load parameters to stack, if necessary
115 uint64_t *stack = (uint64_t *) __builtin_alloca(nr_stack * 8);
116 uint64_t gpregs[GPR_COUNT];
117 double fpregs[FPR_COUNT];
118 invoke_copy_to_stack(stack, paramCount, params, gpregs, fpregs);
120 switch (nr_fpr) {
121 case 8: asm("movupd %0, %xmm7" : : "xmm7" (fpregs[7]));
122 case 7: asm("movupd %0, %xmm6" : : "xmm6" (fpregs[6]));
123 case 6: asm("movupd %0, %xmm5" : : "xmm5" (fpregs[5]));
124 case 5: asm("movupd %0, %xmm4" : : "xmm4" (fpregs[4]));
125 case 4: asm("movupd %0, %xmm3" : : "xmm3" (fpregs[3]));
126 case 3: asm("movupd %0, %xmm2" : : "xmm2" (fpregs[2]));
127 case 2: asm("movupd %0, %xmm1" : : "xmm1" (fpregs[1]));
128 case 1: asm("movupd %0, %xmm0" : : "xmm0" (fpregs[0]));
129 case 0:;
130 }
132 // Ensure that assignments to SSE registers won't be optimized away
133 asm("" ::: "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7");
135 // Get pointer to method
136 uint64_t methodAddress = *((uint64_t *)that);
137 methodAddress += 16 + 8 * methodIndex;
138 methodAddress = *((uint64_t *)methodAddress);
140 typedef uint32_t (*Method)(uint64_t, uint64_t, uint64_t, uint64_t, uint64_t, uint64_t);
141 uint32_t result = ((Method)methodAddress)((uint64_t)that, gpregs[1], gpregs[2], gpregs[3], gpregs[4], gpregs[5]);
142 return result;
143 }
