The Tor Browser: xpcom/reflect/xptcall/src/md/unix/xptcstubs_asm

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

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

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

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

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

     8 #ifdef ANDROID

     9 #include <asm/regdef.h>

    10 #include <asm/asm.h>

    11 #include <machine/asm.h>

    12 #else

    13 #include <sys/regdef.h>

    14 #include <sys/asm.h>

    15 #endif

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

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

    19 # argument slots is sometimes predefined in the header files.

    20 #ifndef NARGSAVE

    21 #define NARGSAVE 4

    22 #endif

    24 #define LOCALSZ 2	/* gp, ra */

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

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

    28 #define GPOFF (FRAMESZ - (2*SZREG))

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

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

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

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

    35 	.text

    37 #define STUB_ENTRY(x)						\

    38 	.if x < 10;						\

    39 	.globl	_ZN14nsXPTCStubBase5Stub ##x ##Ev;		\

    40 	.type	_ZN14nsXPTCStubBase5Stub ##x ##Ev,@function;	\

    41 	.aent	_ZN14nsXPTCStubBase5Stub ##x ##Ev,0;		\

    42 _ZN14nsXPTCStubBase5Stub ##x ##Ev:;				\

    43 	SETUP_GP;						\

    44 	li	t0,x;						\

    45 	b	sharedstub;					\

    46 	.elseif x < 100;					\

    47 	.globl	_ZN14nsXPTCStubBase6Stub ##x ##Ev;		\

    48 	.type	_ZN14nsXPTCStubBase6Stub ##x ##Ev,@function;	\

    49 	.aent	_ZN14nsXPTCStubBase6Stub ##x ##Ev,0;		\

    50 _ZN14nsXPTCStubBase6Stub ##x ##Ev:;				\

    51 	SETUP_GP;						\

    52 	li	t0,x;						\

    53 	b	sharedstub;					\

    54 	.elseif x < 1000;					\

    55 	.globl	_ZN14nsXPTCStubBase7Stub ##x ##Ev;		\

    56 	.type	_ZN14nsXPTCStubBase7Stub ##x ##Ev,@function;	\

    57 	.aent	_ZN14nsXPTCStubBase7Stub ##x ##Ev,0;		\

    58 _ZN14nsXPTCStubBase7Stub ##x ##Ev:;				\

    59 	SETUP_GP;						\

    60 	li	t0,x;						\

    61 	b	sharedstub;					\

    62 	.else;							\

    63 	.err;							\

    64 	.endif

    66 # SENTINEL_ENTRY is handled in the cpp file.

    67 #define SENTINEL_ENTRY(x)

    69 #

    70 # open a dummy frame for the function entries

    71 #

    72 	.align	2

    73 	.type	dummy,@function

    74 	.ent	dummy, 0

    75 	.frame	sp, FRAMESZ, ra

    76 dummy:

    77 	SETUP_GP

    79 #include "xptcstubsdef.inc"

    81 sharedstub:

    82 	subu	sp, FRAMESZ

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

    85 	.mask 0x900000F0, RAOFF-FRAMESZ

    87 	sw	ra, RAOFF(sp)

    88 	SAVE_GP(GPOFF)

    90 	# Micro-optimization: a0 is already loaded, and its slot gets

    91 	# ignored by PrepareAndDispatch, so no need to save it here.

    92 	# sw	a0, A0OFF(sp)

    93 	sw	a1, A1OFF(sp)

    94 	sw	a2, A2OFF(sp)

    95 	sw	a3, A3OFF(sp)

    97 	la	t9, PrepareAndDispatch

    99 	# t0 is methodIndex

   100 	move	a1, t0

   101 	# have a2 point to the begin of the argument space on stack

   102 	addiu	a2, sp, FRAMESZ

   104 	# PrepareAndDispatch(that, methodIndex, args)

   105 	jalr	t9

   107 	# Micro-optimization: Using jalr explicitly has the side-effect

   108 	# of not triggering .cprestore. This is ok because we have no

   109 	# gp reference below this point. It also allows better

   110 	# instruction sscheduling.

   111 	# lw	gp, GPOFF(fp)

   113  	lw	ra, RAOFF(sp)

   114 	addiu	sp, FRAMESZ

   115 	j	ra

   116 	END(dummy)

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