xptcinvoke_asm_mips.S

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/* -*- Mode: asm; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-

 * Version: MPL 1.1

 * 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

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* This code is for MIPS using the O32 ABI. */

#ifdef ANDROID

#include <asm/regdef.h>

#include <asm/asm.h>

#include <machine/asm.h>

#else

#include <sys/regdef.h>

#include <sys/asm.h>

#endif

# NARGSAVE is the argument space in the callers frame, including extra

# 'shadowed' space for the argument registers. The minimum of 4

# argument slots is sometimes predefined in the header files.

#ifndef NARGSAVE

#define NARGSAVE 4

#endif

#define LOCALSZ 3	/* gp, fp, ra */

#define FRAMESZ ((((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK)

#define RAOFF (FRAMESZ - (1*SZREG))

#define FPOFF (FRAMESZ - (2*SZREG))

#define GPOFF (FRAMESZ - (3*SZREG))

#define A0OFF (FRAMESZ + (0*SZREG))

#define A1OFF (FRAMESZ + (1*SZREG))

#define A2OFF (FRAMESZ + (2*SZREG))

#define A3OFF (FRAMESZ + (3*SZREG))

	.text

# _NS_InvokeByIndex(that, methodIndex, paramCount, params)

#                      a0       a1          a2         a3

	.globl	_NS_InvokeByIndex

	.align	2

	.type	_NS_InvokeByIndex,@function

	.ent	_NS_InvokeByIndex,0

	.frame	fp, FRAMESZ, ra

_NS_InvokeByIndex:

	SETUP_GP

	subu	sp, FRAMESZ

	# specify the save register mask for gp, fp, ra, a3 - a0

	.mask 0xD00000F0, RAOFF-FRAMESZ

	sw	ra, RAOFF(sp)

	sw	fp, FPOFF(sp)

	# we can't use .cprestore in a variable stack frame

	sw	gp, GPOFF(sp)

	sw	a0, A0OFF(sp)

	sw	a1, A1OFF(sp)

	sw	a2, A2OFF(sp)

	sw	a3, A3OFF(sp)

	# save bottom of fixed frame

	move	fp, sp

	# extern "C" uint32

	# invoke_count_words(uint32_t paramCount, nsXPTCVariant* s);

	la	t9, invoke_count_words

	move	a0, a2

	move	a1, a3

	jalr	t9

	lw  	gp, GPOFF(fp)

	# allocate variable stack, with a size of:

	# wordsize (of 4 bytes) * result (already aligned to dword)

	# but a minimum of 16 byte

	sll	v0, 2

	slt	t0, v0, 16

	beqz	t0, 1f

	li	v0, 16

1:	subu	sp, v0

	# let a0 point to the bottom of the variable stack, allocate

	# another fixed stack for:

	# extern "C" void

	# invoke_copy_to_stack(uint32_t* d, uint32_t paramCount,

	#		       nsXPTCVariant* s);

	la	t9, invoke_copy_to_stack

	move	a0, sp

	lw	a1, A2OFF(fp)

	lw	a2, A3OFF(fp)

	subu	sp, 16

	jalr	t9

	lw  	gp, GPOFF(fp)

	# back to the variable stack frame

	addu	sp, 16

	# calculate the function we need to jump to, which must then be

	# stored in t9

	lw	a0, A0OFF(fp)	# a0 = set "that" to be "this"

	lw	t0, A1OFF(fp)	# a1 = methodIndex

	lw	t9, 0(a0)

	# t0 = methodIndex << PTRLOG

	sll	t0, t0, PTRLOG

	addu	t9, t0

	lw	t9, (t9)

	# Set a1-a3 to what invoke_copy_to_stack told us. a0 is already

	# the "this" pointer. We don't have to care about floating

	# point arguments, the non-FP "this" pointer as first argument

	# means they'll never be used.

	lw	a1, 1*SZREG(sp)

	lw	a2, 2*SZREG(sp)

	lw	a3, 3*SZREG(sp)

	jalr	t9

	# Micro-optimization: There's no gp usage below this point, so

	# we don't reload.

	# lw	gp, GPOFF(fp)

	# leave variable stack frame

	move	sp, fp

	lw	ra, RAOFF(sp)

	lw	fp, FPOFF(sp)

	addiu	sp, FRAMESZ

	j	ra

END(_NS_InvokeByIndex)