The Tor Browser / file comparison
comparison: xpcom/reflect/xptcall/src/md/unix/xptcinvoke_x86_64_solaris.cpp
xpcom/reflect/xptcall/src/md/unix/xptcinvoke_x86_64_solaris.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
equal
deleted
inserted
replaced
| -1:000000000000 | 0:be1fc1e12ecc |
|---|---|
| 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 // Platform specific code to invoke XPCOM methods on native objects | |
| 8 | |
| 9 #include "xptcprivate.h" | |
| 10 #include "alloca.h" | |
| 11 | |
| 12 // 6 integral parameters are passed in registers | |
| 13 const uint32_t GPR_COUNT = 6; | |
| 14 | |
| 15 // 8 floating point parameters are passed in SSE registers | |
| 16 const uint32_t FPR_COUNT = 8; | |
| 17 | |
| 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; | |
| 26 | |
| 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 } | |
| 44 | |
| 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; | |
| 52 | |
| 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 } | |
| 74 | |
| 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 } | |
| 102 | |
| 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); | |
| 109 | |
| 110 // Stack, if used, must be 16-bytes aligned | |
| 111 if (nr_stack) | |
| 112 nr_stack = (nr_stack + 1) & ~1; | |
| 113 | |
| 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); | |
| 119 | |
| 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 } | |
| 131 | |
| 132 // Ensure that assignments to SSE registers won't be optimized away | |
| 133 asm("" ::: "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7"); | |
| 134 | |
| 135 // Get pointer to method | |
| 136 uint64_t methodAddress = *((uint64_t *)that); | |
| 137 methodAddress += 16 + 8 * methodIndex; | |
| 138 methodAddress = *((uint64_t *)methodAddress); | |
| 139 | |
| 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 } |
