michael@0: /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: // Platform specific code to invoke XPCOM methods on native objects
michael@0: 
michael@0: // The purpose of NS_InvokeByIndex() is to map a platform
michael@0: // indepenpent call to the platform ABI. To do that,
michael@0: // NS_InvokeByIndex() has to determine the method to call via vtable
michael@0: // access. The parameters for the method are read from the
michael@0: // nsXPTCVariant* and prepared for th native ABI.  For the Linux/PPC
michael@0: // ABI this means that the first 8 integral and floating point
michael@0: // parameters are passed in registers.
michael@0: 
michael@0: #include "xptcprivate.h"
michael@0: 
michael@0: // 8 integral parameters are passed in registers
michael@0: #define GPR_COUNT     8
michael@0: 
michael@0: // With hardfloat support 8 floating point parameters are passed in registers,
michael@0: // floats are promoted to doubles when passed in registers
michael@0: // In Softfloat mode, everything is handled via gprs
michael@0: #ifndef __NO_FPRS__
michael@0: #define FPR_COUNT     8
michael@0: #endif
michael@0: extern "C" uint32_t
michael@0: invoke_count_words(uint32_t paramCount, nsXPTCVariant* s)
michael@0: {
michael@0:   return uint32_t(((paramCount * 2) + 3) & ~3);
michael@0: }
michael@0: 
michael@0: extern "C" void
michael@0: invoke_copy_to_stack(uint32_t* d,
michael@0:                      uint32_t paramCount,
michael@0:                      nsXPTCVariant* s, 
michael@0:                      uint32_t* gpregs,
michael@0:                      double* fpregs)
michael@0: {
michael@0:     uint32_t gpr = 1; // skip one GP reg for 'that'
michael@0: #ifndef __NO_FPRS__
michael@0:     uint32_t fpr = 0;
michael@0: #endif
michael@0:     uint32_t tempu32;
michael@0:     uint64_t tempu64;
michael@0:     
michael@0:     for(uint32_t i = 0; i < paramCount; i++, s++) {
michael@0:         if(s->IsPtrData()) {
michael@0:             if(s->type == nsXPTType::T_JSVAL)
michael@0:                 tempu32 = (uint32_t) &s->ptr;
michael@0:             else
michael@0:                 tempu32 = (uint32_t) s->ptr;
michael@0:         }
michael@0:         else {
michael@0:             switch(s->type) {
michael@0:             case nsXPTType::T_FLOAT:                                  break;
michael@0:             case nsXPTType::T_DOUBLE:                                 break;
michael@0:             case nsXPTType::T_I8:     tempu32 = s->val.i8;            break;
michael@0:             case nsXPTType::T_I16:    tempu32 = s->val.i16;           break;
michael@0:             case nsXPTType::T_I32:    tempu32 = s->val.i32;           break;
michael@0:             case nsXPTType::T_I64:    tempu64 = s->val.i64;           break;
michael@0:             case nsXPTType::T_U8:     tempu32 = s->val.u8;            break;
michael@0:             case nsXPTType::T_U16:    tempu32 = s->val.u16;           break;
michael@0:             case nsXPTType::T_U32:    tempu32 = s->val.u32;           break;
michael@0:             case nsXPTType::T_U64:    tempu64 = s->val.u64;           break;
michael@0:             case nsXPTType::T_BOOL:   tempu32 = s->val.b;             break;
michael@0:             case nsXPTType::T_CHAR:   tempu32 = s->val.c;             break;
michael@0:             case nsXPTType::T_WCHAR:  tempu32 = s->val.wc;            break;
michael@0:             default:                  tempu32 = (uint32_t) s->val.p;  break;
michael@0:             }
michael@0:         }
michael@0: 
michael@0:         if (!s->IsPtrData() && s->type == nsXPTType::T_DOUBLE) {
michael@0: #ifndef __NO_FPRS__
michael@0:             if (fpr < FPR_COUNT)
michael@0:                 fpregs[fpr++]    = s->val.d;
michael@0: #else
michael@0:             if (gpr & 1)
michael@0:                 gpr++;
michael@0:             if ((gpr + 1) < GPR_COUNT) {
michael@0:                 *((double*) &gpregs[gpr]) = s->val.d;
michael@0:                 gpr += 2;
michael@0:             }
michael@0: #endif
michael@0:             else {
michael@0:                 if ((uint32_t) d & 4) d++; // doubles are 8-byte aligned on stack
michael@0:                 *((double*) d) = s->val.d;
michael@0:                 d += 2;
michael@0:             }
michael@0:         }
michael@0:         else if (!s->IsPtrData() && s->type == nsXPTType::T_FLOAT) {
michael@0: #ifndef __NO_FPRS__
michael@0:             if (fpr < FPR_COUNT)
michael@0:                 fpregs[fpr++]   = s->val.f; // if passed in registers, floats are promoted to doubles
michael@0: #else
michael@0:             if (gpr < GPR_COUNT)
michael@0:                 *((float*) &gpregs[gpr++]) = s->val.f;
michael@0: #endif
michael@0:             else
michael@0:                 *((float*) d++) = s->val.f;
michael@0:         }
michael@0:         else if (!s->IsPtrData() && (s->type == nsXPTType::T_I64
michael@0:                                      || s->type == nsXPTType::T_U64)) {
michael@0:             if (gpr & 1) gpr++; // longlongs are aligned in odd/even register pairs, eg. r5/r6
michael@0:             if ((gpr + 1) < GPR_COUNT) {
michael@0:                 *((uint64_t*) &gpregs[gpr]) = tempu64;
michael@0:                 gpr += 2;
michael@0:             }
michael@0:             else {
michael@0:                 if ((uint32_t) d & 4) d++; // longlongs are 8-byte aligned on stack
michael@0:                 *((uint64_t*) d)            = tempu64;
michael@0:                 d += 2;
michael@0:             }
michael@0:         }
michael@0:         else {
michael@0:             if (gpr < GPR_COUNT)
michael@0:                 gpregs[gpr++] = tempu32;
michael@0:             else
michael@0:                 *d++          = tempu32;
michael@0:         }
michael@0:         
michael@0:     }
michael@0: }
michael@0: 
michael@0: extern "C"
michael@0: EXPORT_XPCOM_API(nsresult)
michael@0: NS_InvokeByIndex(nsISupports* that, uint32_t methodIndex,
michael@0:                  uint32_t paramCount, nsXPTCVariant* params);