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