зеркало из https://github.com/mozilla/gecko-dev.git
145 строки
5.2 KiB
C++
145 строки
5.2 KiB
C++
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* Platform specific code to invoke XPCOM methods on native objects */
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#include "xptcprivate.h"
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/* Prototype specifies unmangled function name and disables unused warning */
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static void
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invoke_copy_to_stack(uint64_t* d, uint32_t paramCount, nsXPTCVariant* s)
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__asm__("invoke_copy_to_stack") __attribute__((used));
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static void
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invoke_copy_to_stack(uint64_t* d, uint32_t paramCount, nsXPTCVariant* s)
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{
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const uint8_t NUM_ARG_REGS = 6-1; // -1 for "this" pointer
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for(uint32_t i = 0; i < paramCount; i++, d++, s++)
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{
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if(s->IsPtrData())
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{
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*d = (uint64_t)s->ptr;
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continue;
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}
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switch(s->type)
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{
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case nsXPTType::T_I8 : *d = (uint64_t)s->val.i8; break;
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case nsXPTType::T_I16 : *d = (uint64_t)s->val.i16; break;
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case nsXPTType::T_I32 : *d = (uint64_t)s->val.i32; break;
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case nsXPTType::T_I64 : *d = (uint64_t)s->val.i64; break;
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case nsXPTType::T_U8 : *d = (uint64_t)s->val.u8; break;
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case nsXPTType::T_U16 : *d = (uint64_t)s->val.u16; break;
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case nsXPTType::T_U32 : *d = (uint64_t)s->val.u32; break;
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case nsXPTType::T_U64 : *d = (uint64_t)s->val.u64; break;
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case nsXPTType::T_FLOAT :
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if(i < NUM_ARG_REGS)
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{
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// convert floats to doubles if they are to be passed
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// via registers so we can just deal with doubles later
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union { uint64_t u64; double d; } t;
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t.d = (double)s->val.f;
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*d = t.u64;
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}
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else
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// otherwise copy to stack normally
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*d = (uint64_t)s->val.u32;
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break;
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case nsXPTType::T_DOUBLE : *d = (uint64_t)s->val.u64; break;
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case nsXPTType::T_BOOL : *d = (uint64_t)s->val.b; break;
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case nsXPTType::T_CHAR : *d = (uint64_t)s->val.c; break;
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case nsXPTType::T_WCHAR : *d = (uint64_t)s->val.wc; break;
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default:
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// all the others are plain pointer types
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*d = (uint64_t)s->val.p;
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break;
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}
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}
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}
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/*
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* EXPORT_XPCOM_API(nsresult)
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* NS_InvokeByIndex(nsISupports* that, uint32_t methodIndex,
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* uint32_t paramCount, nsXPTCVariant* params)
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*/
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__asm__(
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"#### NS_InvokeByIndex ####\n"
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".text\n\t"
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".align 5\n\t"
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".globl NS_InvokeByIndex\n\t"
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".ent NS_InvokeByIndex\n"
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"NS_InvokeByIndex:\n\t"
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".frame $15,32,$26,0\n\t"
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".mask 0x4008000,-32\n\t"
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"ldgp $29,0($27)\n"
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"$NS_InvokeByIndex..ng:\n\t"
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"subq $30,32,$30\n\t"
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"stq $26,0($30)\n\t"
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"stq $15,8($30)\n\t"
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"bis $30,$30,$15\n\t"
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".prologue 1\n\t"
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/*
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* Allocate enough stack space to hold the greater of 6 or "paramCount"+1
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* parameters. (+1 for "this" pointer) Room for at least 6 parameters
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* is required for storage of those passed via registers.
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*/
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"bis $31,5,$2\n\t" /* count = MAX(5, "paramCount") */
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"cmplt $2,$18,$1\n\t"
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"cmovne $1,$18,$2\n\t"
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"s8addq $2,16,$1\n\t" /* room for count+1 params (8 bytes each) */
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"bic $1,15,$1\n\t" /* stack space is rounded up to 0 % 16 */
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"subq $30,$1,$30\n\t"
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"stq $16,0($30)\n\t" /* save "that" (as "this" pointer) */
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"stq $17,16($15)\n\t" /* save "methodIndex" */
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"addq $30,8,$16\n\t" /* pass stack pointer */
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"bis $18,$18,$17\n\t" /* pass "paramCount" */
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"bis $19,$19,$18\n\t" /* pass "params" */
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"bsr $26,$invoke_copy_to_stack..ng\n\t" /* call invoke_copy_to_stack */
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/*
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* Copy the first 6 parameters to registers and remove from stack frame.
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* Both the integer and floating point registers are set for each parameter
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* except the first which is the "this" pointer. (integer only)
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* The floating point registers are all set as doubles since the
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* invoke_copy_to_stack function should have converted the floats.
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*/
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"ldq $16,0($30)\n\t" /* integer registers */
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"ldq $17,8($30)\n\t"
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"ldq $18,16($30)\n\t"
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"ldq $19,24($30)\n\t"
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"ldq $20,32($30)\n\t"
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"ldq $21,40($30)\n\t"
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"ldt $f17,8($30)\n\t" /* floating point registers */
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"ldt $f18,16($30)\n\t"
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"ldt $f19,24($30)\n\t"
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"ldt $f20,32($30)\n\t"
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"ldt $f21,40($30)\n\t"
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"addq $30,48,$30\n\t" /* remove params from stack */
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/*
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* Call the virtual function with the constructed stack frame.
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*/
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"bis $16,$16,$1\n\t" /* load "this" */
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"ldq $2,16($15)\n\t" /* load "methodIndex" */
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"ldq $1,0($1)\n\t" /* load vtable */
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"s8addq $2,$31,$2\n\t" /* vtable index = "methodIndex" * 8 */
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"addq $1,$2,$1\n\t"
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"ldq $27,0($1)\n\t" /* load address of function */
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"jsr $26,($27),0\n\t" /* call virtual function */
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"ldgp $29,0($26)\n\t"
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"bis $15,$15,$30\n\t"
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"ldq $26,0($30)\n\t"
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"ldq $15,8($30)\n\t"
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"addq $30,32,$30\n\t"
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"ret $31,($26),1\n\t"
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".end NS_InvokeByIndex"
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);
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