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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_RUNTIME_ARCH_ARM_ASM_SUPPORT_ARM_S_
#define ART_RUNTIME_ARCH_ARM_ASM_SUPPORT_ARM_S_
#include "asm_support_arm.h"
// Define special registers.
// Register holding suspend check count down.
#define rSUSPEND r4
// Register holding Thread::Current().
#define rSELF r9
.syntax unified
.arch armv7-a
.thumb
// Macro to generate the value of Runtime::Current into rDest clobbering rTemp. As it uses labels
// then the labels need to be unique. We bind these to the function name in the ENTRY macros.
.macro RUNTIME_CURRENT name, num, rDest, rTemp
.if .Lruntime_current\num\()_used
.error
.endif
.set .Lruntime_current\num\()_used, 1
ldr \rDest, .Lgot_\name\()_\num @ Load offset of the GOT.
ldr \rTemp, .Lruntime_instance_\name\()_\num @ Load GOT offset of Runtime::instance_.
.Lload_got_\name\()_\num\():
add \rDest, pc @ Fixup GOT address.
ldr \rDest, [\rDest, \rTemp] @ Load address of Runtime::instance_.
ldr \rDest, [\rDest] @ Load Runtime::instance_.
.endm
// Common ENTRY declaration code for ARM and thumb, an ENTRY should always be paired with an END.
// Declares the RUNTIME_CURRENT[123] macros that can be used within an ENTRY and will have literals
// generated at END.
.macro DEF_ENTRY thumb_or_arm, name
\thumb_or_arm
// Clang ignores .thumb_func and requires an explicit .thumb. Investigate whether we should still
// carry around the .thumb_func.
.ifc \thumb_or_arm, .thumb_func
.thumb
.endif
.type \name, #function
.hidden \name // Hide this as a global symbol, so we do not incur plt calls.
.global \name
// Cache alignment for function entry.
.balign 16
\name:
.cfi_startproc
.fnstart
// Track whether RUNTIME_CURRENT was used.
.set .Lruntime_current1_used, 0
.set .Lruntime_current2_used, 0
.set .Lruntime_current3_used, 0
// The RUNTIME_CURRENT macros that are bound to the \name argument of DEF_ENTRY to ensure
// that label names are unique.
.macro RUNTIME_CURRENT1 rDest, rTemp
RUNTIME_CURRENT \name, 1, \rDest, \rTemp
.endm
.macro RUNTIME_CURRENT2 rDest, rTemp
RUNTIME_CURRENT \name, 2, \rDest, \rTemp
.endm
.macro RUNTIME_CURRENT3 rDest, rTemp
RUNTIME_CURRENT \name, 3, \rDest, \rTemp
.endm
.endm
// A thumb2 style ENTRY.
.macro ENTRY name
DEF_ENTRY .thumb_func, \name
.endm
// A ARM style ENTRY.
.macro ARM_ENTRY name
DEF_ENTRY .arm, \name
.endm
// Terminate an ENTRY and generate GOT references.
.macro END name
// Generate offsets of GOT and Runtime::instance_ used in RUNTIME_CURRENT.
.if .Lruntime_current1_used
.Lgot_\name\()_1:
.word _GLOBAL_OFFSET_TABLE_-(.Lload_got_\name\()_1+4)
.Lruntime_instance_\name\()_1:
.word _ZN3art7Runtime9instance_E(GOT)
.endif
.if .Lruntime_current2_used
.Lgot_\name\()_2:
.word _GLOBAL_OFFSET_TABLE_-(.Lload_got_\name\()_2+4)
.Lruntime_instance_\name\()_2:
.word _ZN3art7Runtime9instance_E(GOT)
.endif
.if .Lruntime_current3_used
.Lgot_\name\()_3:
.word _GLOBAL_OFFSET_TABLE_-(.Lload_got_\name\()_3+4)
.Lruntime_instance_\name\()_3:
.word _ZN3art7Runtime9instance_E(GOT)
.endif
// Remove the RUNTIME_CURRENTx macros so they get rebound in the next function entry.
.purgem RUNTIME_CURRENT1
.purgem RUNTIME_CURRENT2
.purgem RUNTIME_CURRENT3
.fnend
.cfi_endproc
.size \name, .-\name
.endm
// Declare an unimplemented ENTRY that will halt a debugger.
.macro UNIMPLEMENTED name
ENTRY \name
bkpt
bkpt
END \name
.endm
#endif // ART_RUNTIME_ARCH_X86_ASM_SUPPORT_X86_S_
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