1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/xpcom/reflect/xptcall/src/md/unix/xptcstubs_x86_64_darwin.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,190 @@
1.4 +/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + *
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +// Implement shared vtbl methods.
1.11 +
1.12 +// Keep this in sync with the linux version.
1.13 +
1.14 +#include "xptcprivate.h"
1.15 +#include "xptiprivate.h"
1.16 +
1.17 +// The Darwin/x86-64 ABI passes the first 6 integer parameters and the
1.18 +// first 8 floating point parameters in registers (rdi, rsi, rdx, rcx,
1.19 +// r8, r9 and xmm0-xmm7), no stack space is allocated for these by the
1.20 +// caller. The rest of the parameters are passed in the callers stack
1.21 +// area.
1.22 +
1.23 +const uint32_t PARAM_BUFFER_COUNT = 16;
1.24 +const uint32_t GPR_COUNT = 6;
1.25 +const uint32_t FPR_COUNT = 8;
1.26 +
1.27 +// PrepareAndDispatch() is called by SharedStub() and calls the actual method.
1.28 +//
1.29 +// - 'args[]' contains the arguments passed on stack
1.30 +// - 'gpregs[]' contains the arguments passed in integer registers
1.31 +// - 'fpregs[]' contains the arguments passed in floating point registers
1.32 +//
1.33 +// The parameters are mapped into an array of type 'nsXPTCMiniVariant'
1.34 +// and then the method gets called.
1.35 +
1.36 +extern "C" nsresult ATTRIBUTE_USED
1.37 +PrepareAndDispatch(nsXPTCStubBase * self, uint32_t methodIndex,
1.38 + uint64_t * args, uint64_t * gpregs, double *fpregs)
1.39 +{
1.40 + nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
1.41 + nsXPTCMiniVariant* dispatchParams = nullptr;
1.42 + const nsXPTMethodInfo* info;
1.43 + uint32_t paramCount;
1.44 + uint32_t i;
1.45 + nsresult result = NS_ERROR_FAILURE;
1.46 +
1.47 + NS_ASSERTION(self,"no self");
1.48 +
1.49 + self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info);
1.50 + NS_ASSERTION(info,"no method info");
1.51 + if (!info)
1.52 + return NS_ERROR_UNEXPECTED;
1.53 +
1.54 + paramCount = info->GetParamCount();
1.55 +
1.56 + // setup variant array pointer
1.57 + if (paramCount > PARAM_BUFFER_COUNT)
1.58 + dispatchParams = new nsXPTCMiniVariant[paramCount];
1.59 + else
1.60 + dispatchParams = paramBuffer;
1.61 +
1.62 + NS_ASSERTION(dispatchParams,"no place for params");
1.63 + if (!dispatchParams)
1.64 + return NS_ERROR_OUT_OF_MEMORY;
1.65 +
1.66 + uint64_t* ap = args;
1.67 + uint32_t nr_gpr = 1; // skip one GPR register for 'that'
1.68 + uint32_t nr_fpr = 0;
1.69 + uint64_t value;
1.70 +
1.71 + for (i = 0; i < paramCount; i++) {
1.72 + const nsXPTParamInfo& param = info->GetParam(i);
1.73 + const nsXPTType& type = param.GetType();
1.74 + nsXPTCMiniVariant* dp = &dispatchParams[i];
1.75 +
1.76 + if (!param.IsOut() && type == nsXPTType::T_DOUBLE) {
1.77 + if (nr_fpr < FPR_COUNT)
1.78 + dp->val.d = fpregs[nr_fpr++];
1.79 + else
1.80 + dp->val.d = *(double*) ap++;
1.81 + continue;
1.82 + }
1.83 + else if (!param.IsOut() && type == nsXPTType::T_FLOAT) {
1.84 + if (nr_fpr < FPR_COUNT)
1.85 + // The value in %xmm register is already prepared to
1.86 + // be retrieved as a float. Therefore, we pass the
1.87 + // value verbatim, as a double without conversion.
1.88 + dp->val.d = fpregs[nr_fpr++];
1.89 + else
1.90 + dp->val.f = *(float*) ap++;
1.91 + continue;
1.92 + }
1.93 + else {
1.94 + if (nr_gpr < GPR_COUNT)
1.95 + value = gpregs[nr_gpr++];
1.96 + else
1.97 + value = *ap++;
1.98 + }
1.99 +
1.100 + if (param.IsOut() || !type.IsArithmetic()) {
1.101 + dp->val.p = (void*) value;
1.102 + continue;
1.103 + }
1.104 +
1.105 + switch (type) {
1.106 + case nsXPTType::T_I8: dp->val.i8 = (int8_t) value; break;
1.107 + case nsXPTType::T_I16: dp->val.i16 = (int16_t) value; break;
1.108 + case nsXPTType::T_I32: dp->val.i32 = (int32_t) value; break;
1.109 + case nsXPTType::T_I64: dp->val.i64 = (int64_t) value; break;
1.110 + case nsXPTType::T_U8: dp->val.u8 = (uint8_t) value; break;
1.111 + case nsXPTType::T_U16: dp->val.u16 = (uint16_t) value; break;
1.112 + case nsXPTType::T_U32: dp->val.u32 = (uint32_t) value; break;
1.113 + case nsXPTType::T_U64: dp->val.u64 = (uint64_t) value; break;
1.114 + // Cast to uint8_t first, to remove garbage on upper 56 bits.
1.115 + case nsXPTType::T_BOOL: dp->val.b = (bool)(uint8_t) value; break;
1.116 + case nsXPTType::T_CHAR: dp->val.c = (char) value; break;
1.117 + case nsXPTType::T_WCHAR: dp->val.wc = (wchar_t) value; break;
1.118 +
1.119 + default:
1.120 + NS_ERROR("bad type");
1.121 + break;
1.122 + }
1.123 + }
1.124 +
1.125 + result = self->mOuter->CallMethod((uint16_t) methodIndex, info, dispatchParams);
1.126 +
1.127 + if (dispatchParams != paramBuffer)
1.128 + delete [] dispatchParams;
1.129 +
1.130 + return result;
1.131 +}
1.132 +
1.133 +// Darwin/x86-64 uses gcc >= 4.2
1.134 +
1.135 +#define STUB_ENTRY(n) \
1.136 +asm(".section __TEXT,__text\n\t" \
1.137 + ".align 3\n\t" \
1.138 + ".if " #n " < 10\n\t" \
1.139 + ".globl __ZN14nsXPTCStubBase5Stub" #n "Ev\n\t" \
1.140 + "__ZN14nsXPTCStubBase5Stub" #n "Ev:\n\t" \
1.141 + ".elseif " #n " < 100\n\t" \
1.142 + ".globl __ZN14nsXPTCStubBase6Stub" #n "Ev\n\t" \
1.143 + "__ZN14nsXPTCStubBase6Stub" #n "Ev:\n\t" \
1.144 + ".elseif " #n " < 1000\n\t" \
1.145 + ".globl __ZN14nsXPTCStubBase7Stub" #n "Ev\n\t" \
1.146 + "__ZN14nsXPTCStubBase7Stub" #n "Ev:\n\t" \
1.147 + ".else\n\t" \
1.148 + ".err \"stub number " #n " >= 1000 not yet supported\"\n\t" \
1.149 + ".endif\n\t" \
1.150 + "movl $" #n ", %eax\n\t" \
1.151 + "jmp SharedStub\n\t");
1.152 +
1.153 +// static nsresult SharedStub(uint32_t methodIndex)
1.154 +asm(".section __TEXT,__text\n\t"
1.155 + ".align 3\n\t"
1.156 + "SharedStub:\n\t"
1.157 + // make room for gpregs (48), fpregs (64)
1.158 + "pushq %rbp\n\t"
1.159 + "movq %rsp,%rbp\n\t"
1.160 + "subq $112,%rsp\n\t"
1.161 + // save GP registers
1.162 + "movq %rdi,-112(%rbp)\n\t"
1.163 + "movq %rsi,-104(%rbp)\n\t"
1.164 + "movq %rdx, -96(%rbp)\n\t"
1.165 + "movq %rcx, -88(%rbp)\n\t"
1.166 + "movq %r8 , -80(%rbp)\n\t"
1.167 + "movq %r9 , -72(%rbp)\n\t"
1.168 + "leaq -112(%rbp),%rcx\n\t"
1.169 + // save FP registers
1.170 + "movsd %xmm0,-64(%rbp)\n\t"
1.171 + "movsd %xmm1,-56(%rbp)\n\t"
1.172 + "movsd %xmm2,-48(%rbp)\n\t"
1.173 + "movsd %xmm3,-40(%rbp)\n\t"
1.174 + "movsd %xmm4,-32(%rbp)\n\t"
1.175 + "movsd %xmm5,-24(%rbp)\n\t"
1.176 + "movsd %xmm6,-16(%rbp)\n\t"
1.177 + "movsd %xmm7, -8(%rbp)\n\t"
1.178 + "leaq -64(%rbp),%r8\n\t"
1.179 + // rdi has the 'self' pointer already
1.180 + "movl %eax,%esi\n\t"
1.181 + "leaq 16(%rbp),%rdx\n\t"
1.182 + "call _PrepareAndDispatch\n\t"
1.183 + "leave\n\t"
1.184 + "ret\n\t");
1.185 +
1.186 +#define SENTINEL_ENTRY(n) \
1.187 +nsresult nsXPTCStubBase::Sentinel##n() \
1.188 +{ \
1.189 + NS_ERROR("nsXPTCStubBase::Sentinel called"); \
1.190 + return NS_ERROR_NOT_IMPLEMENTED; \
1.191 +}
1.192 +
1.193 +#include "xptcstubsdef.inc"
