michael@0: /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- michael@0: * 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: #include "xptcprivate.h" michael@0: #include "alloca.h" michael@0: michael@0: // 6 integral parameters are passed in registers michael@0: const uint32_t GPR_COUNT = 6; michael@0: michael@0: // 8 floating point parameters are passed in SSE registers michael@0: const uint32_t FPR_COUNT = 8; michael@0: michael@0: // Remember that these 'words' are 64-bit long michael@0: static inline void michael@0: invoke_count_words(uint32_t paramCount, nsXPTCVariant * s, michael@0: uint32_t & nr_gpr, uint32_t & nr_fpr, uint32_t & nr_stack) michael@0: { michael@0: nr_gpr = 1; // skip one GP register for 'that' michael@0: nr_fpr = 0; michael@0: nr_stack = 0; michael@0: michael@0: /* Compute number of eightbytes of class MEMORY. */ michael@0: for (uint32_t i = 0; i < paramCount; i++, s++) { michael@0: if (!s->IsPtrData() michael@0: && (s->type == nsXPTType::T_FLOAT || s->type == nsXPTType::T_DOUBLE)) { michael@0: if (nr_fpr < FPR_COUNT) michael@0: nr_fpr++; michael@0: else michael@0: nr_stack++; michael@0: } michael@0: else { michael@0: if (nr_gpr < GPR_COUNT) michael@0: nr_gpr++; michael@0: else michael@0: nr_stack++; michael@0: } michael@0: } michael@0: } michael@0: michael@0: static void michael@0: invoke_copy_to_stack(uint64_t * d, uint32_t paramCount, nsXPTCVariant * s, michael@0: uint64_t * gpregs, double * fpregs) michael@0: { michael@0: uint32_t nr_gpr = 1; // skip one GP register for 'that' michael@0: uint32_t nr_fpr = 0; michael@0: uint64_t value; michael@0: michael@0: for (uint32_t i = 0; i < paramCount; i++, s++) { michael@0: if (s->IsPtrData()) michael@0: value = (uint64_t) s->ptr; 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: value = s->val.i8; break; michael@0: case nsXPTType::T_I16: value = s->val.i16; break; michael@0: case nsXPTType::T_I32: value = s->val.i32; break; michael@0: case nsXPTType::T_I64: value = s->val.i64; break; michael@0: case nsXPTType::T_U8: value = s->val.u8; break; michael@0: case nsXPTType::T_U16: value = s->val.u16; break; michael@0: case nsXPTType::T_U32: value = s->val.u32; break; michael@0: case nsXPTType::T_U64: value = s->val.u64; break; michael@0: case nsXPTType::T_BOOL: value = s->val.b; break; michael@0: case nsXPTType::T_CHAR: value = s->val.c; break; michael@0: case nsXPTType::T_WCHAR: value = s->val.wc; break; michael@0: default: value = (uint64_t) s->val.p; break; michael@0: } michael@0: } michael@0: michael@0: if (!s->IsPtrData() && s->type == nsXPTType::T_DOUBLE) { michael@0: if (nr_fpr < FPR_COUNT) michael@0: fpregs[nr_fpr++] = s->val.d; michael@0: else { michael@0: *((double *)d) = s->val.d; michael@0: d++; michael@0: } michael@0: } michael@0: else if (!s->IsPtrData() && s->type == nsXPTType::T_FLOAT) { michael@0: if (nr_fpr < FPR_COUNT) michael@0: // The value in %xmm register is already prepared to michael@0: // be retrieved as a float. Therefore, we pass the michael@0: // value verbatim, as a double without conversion. michael@0: fpregs[nr_fpr++] = s->val.d; michael@0: else { michael@0: *((float *)d) = s->val.f; michael@0: d++; michael@0: } michael@0: } michael@0: else { michael@0: if (nr_gpr < GPR_COUNT) michael@0: gpregs[nr_gpr++] = value; michael@0: else michael@0: *d++ = value; michael@0: } michael@0: } michael@0: } michael@0: michael@0: EXPORT_XPCOM_API(nsresult) michael@0: NS_InvokeByIndex(nsISupports * that, uint32_t methodIndex, michael@0: uint32_t paramCount, nsXPTCVariant * params) michael@0: { michael@0: uint32_t nr_gpr, nr_fpr, nr_stack; michael@0: invoke_count_words(paramCount, params, nr_gpr, nr_fpr, nr_stack); michael@0: michael@0: // Stack, if used, must be 16-bytes aligned michael@0: if (nr_stack) michael@0: nr_stack = (nr_stack + 1) & ~1; michael@0: michael@0: // Load parameters to stack, if necessary michael@0: uint64_t *stack = (uint64_t *) __builtin_alloca(nr_stack * 8); michael@0: uint64_t gpregs[GPR_COUNT]; michael@0: double fpregs[FPR_COUNT]; michael@0: invoke_copy_to_stack(stack, paramCount, params, gpregs, fpregs); michael@0: michael@0: switch (nr_fpr) { michael@0: case 8: asm("movupd %0, %xmm7" : : "xmm7" (fpregs[7])); michael@0: case 7: asm("movupd %0, %xmm6" : : "xmm6" (fpregs[6])); michael@0: case 6: asm("movupd %0, %xmm5" : : "xmm5" (fpregs[5])); michael@0: case 5: asm("movupd %0, %xmm4" : : "xmm4" (fpregs[4])); michael@0: case 4: asm("movupd %0, %xmm3" : : "xmm3" (fpregs[3])); michael@0: case 3: asm("movupd %0, %xmm2" : : "xmm2" (fpregs[2])); michael@0: case 2: asm("movupd %0, %xmm1" : : "xmm1" (fpregs[1])); michael@0: case 1: asm("movupd %0, %xmm0" : : "xmm0" (fpregs[0])); michael@0: case 0:; michael@0: } michael@0: michael@0: // Ensure that assignments to SSE registers won't be optimized away michael@0: asm("" ::: "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7"); michael@0: michael@0: // Get pointer to method michael@0: uint64_t methodAddress = *((uint64_t *)that); michael@0: methodAddress += 16 + 8 * methodIndex; michael@0: methodAddress = *((uint64_t *)methodAddress); michael@0: michael@0: typedef uint32_t (*Method)(uint64_t, uint64_t, uint64_t, uint64_t, uint64_t, uint64_t); michael@0: uint32_t result = ((Method)methodAddress)((uint64_t)that, gpregs[1], gpregs[2], gpregs[3], gpregs[4], gpregs[5]); michael@0: return result; michael@0: }