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315 lines
10 KiB
315 lines
10 KiB
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_ARCH_X86_ASM_SUPPORT_X86_S_
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#define ART_RUNTIME_ARCH_X86_ASM_SUPPORT_X86_S_
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#include "asm_support_x86.h"
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#include "interpreter/cfi_asm_support.h"
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// Regular gas(1) & current clang/llvm assembler support named macro parameters.
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#define MACRO0(macro_name) .macro macro_name
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#define MACRO1(macro_name, macro_arg1) .macro macro_name macro_arg1
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#define MACRO2(macro_name, macro_arg1, macro_arg2) .macro macro_name macro_arg1, macro_arg2
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#define MACRO3(macro_name, macro_arg1, macro_arg2, macro_arg3) .macro macro_name macro_arg1, macro_arg2, macro_arg3
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#define MACRO4(macro_name, macro_arg1, macro_arg2, macro_arg3, macro_arg4) .macro macro_name macro_arg1, macro_arg2, macro_arg3, macro_arg4
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#define MACRO5(macro_name, macro_arg1, macro_arg2, macro_arg3, macro_arg4, macro_arg5) .macro macro_name macro_arg1, macro_arg2, macro_arg3, macro_arg4, macro_arg5
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#define END_MACRO .endm
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#if defined(__clang__)
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// Clang/llvm does not support .altmacro. However, the clang/llvm preprocessor doesn't
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// separate the backslash and parameter by a space. Everything just works.
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#define RAW_VAR(name) \name
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#define VAR(name) \name
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#define CALLVAR(name) SYMBOL(\name)
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#define PLT_VAR(name) \name@PLT
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#define REG_VAR(name) %\name
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#define CALL_MACRO(name) \name
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#else
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// Regular gas(1) uses \argument_name for macro arguments.
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// We need to turn on alternate macro syntax so we can use & instead or the preprocessor
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// will screw us by inserting a space between the \ and the name. Even in this mode there's
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// no special meaning to $, so literals are still just $x. The use of altmacro means % is a
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// special character meaning care needs to be taken when passing registers as macro
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// arguments.
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.altmacro
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#define RAW_VAR(name) name&
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#define VAR(name) name&
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#define CALLVAR(name) SYMBOL(name&)
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#define PLT_VAR(name) name&@PLT
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#define REG_VAR(name) %name
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#define CALL_MACRO(name) name&
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#endif
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#define LITERAL(value) $value
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#if defined(__APPLE__)
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#define MACRO_LITERAL(value) $(value)
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#else
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#define MACRO_LITERAL(value) $value
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#endif
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#if defined(__APPLE__)
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#define FUNCTION_TYPE(name)
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#define SIZE(name)
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#else
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#define FUNCTION_TYPE(name) .type name, @function
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#define SIZE(name) .size name, .-name
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#endif
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// CFI support.
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#if !defined(__APPLE__)
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#define CFI_STARTPROC .cfi_startproc
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#define CFI_ENDPROC .cfi_endproc
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#define CFI_ADJUST_CFA_OFFSET(size) .cfi_adjust_cfa_offset size
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#define CFI_DEF_CFA(reg,size) .cfi_def_cfa reg,size
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#define CFI_DEF_CFA_REGISTER(reg) .cfi_def_cfa_register reg
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#define CFI_RESTORE(reg) .cfi_restore reg
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#define CFI_REL_OFFSET(reg,size) .cfi_rel_offset reg,size
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#define CFI_REGISTER(orig_reg, current_reg) .cfi_register orig_reg, current_reg
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#define CFI_REMEMBER_STATE .cfi_remember_state
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// The spec is not clear whether the CFA is part of the saved state and tools
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// differ in the behaviour, so explicitly set the CFA to avoid any ambiguity.
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// The restored CFA state should match the CFA state during CFI_REMEMBER_STATE.
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// `objdump -Wf libart.so | egrep "_cfa|_state"` is useful to audit the opcodes.
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#define CFI_RESTORE_STATE_AND_DEF_CFA(reg,off) .cfi_restore_state .cfi_def_cfa reg,off
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#define CFI_ESCAPE(...) .cfi_escape __VA_ARGS__
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#else
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// Mac OS' doesn't like cfi_* directives.
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#define CFI_STARTPROC
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#define CFI_ENDPROC
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#define CFI_ADJUST_CFA_OFFSET(size)
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#define CFI_DEF_CFA(reg,size)
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#define CFI_DEF_CFA_REGISTER(reg)
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#define CFI_RESTORE(reg)
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#define CFI_REL_OFFSET(reg,size)
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#define CFI_REGISTER(orig_reg, current_reg)
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#define CFI_REMEMBER_STATE
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#define CFI_RESTORE_STATE_AND_DEF_CFA(reg,off)
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#define CFI_ESCAPE(...)
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#endif
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#define CFI_REG_eax 0
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#define CFI_REG_ecx 1
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#define CFI_REG_edx 2
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#define CFI_REG_ebx 3
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#define CFI_REG_esp 4
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#define CFI_REG_ebp 5
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#define CFI_REG_esi 6
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#define CFI_REG_edi 7
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#define CFI_REG_eip 8
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#define CFI_REG(reg) CFI_REG_##reg
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MACRO3(CFI_EXPRESSION_BREG, n, b, offset)
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.if (-0x40 <= (\offset)) && ((\offset) < 0x40)
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CFI_EXPRESSION_BREG_1(\n, \b, \offset)
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.elseif (-0x2000 <= (\offset)) && ((\offset) < 0x2000)
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CFI_EXPRESSION_BREG_2(\n, \b, \offset)
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.else
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.error "Unsupported offset"
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.endif
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END_MACRO
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// Symbols. On a Mac, we need a leading underscore.
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#if !defined(__APPLE__)
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#define SYMBOL(name) name
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#define PLT_SYMBOL(name) name ## @PLT
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#else
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// Mac OS' symbols have an _ prefix.
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#define SYMBOL(name) _ ## name
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#define PLT_SYMBOL(name) _ ## name
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#endif
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// Directive to hide a function symbol.
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#if defined(__APPLE__)
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#define ASM_HIDDEN .private_extern
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#else
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#define ASM_HIDDEN .hidden
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#endif
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/* Cache alignment for function entry */
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MACRO0(ALIGN_FUNCTION_ENTRY)
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// ART-compiled functions have OatQuickMethodHeader but assembly funtions do not.
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// Prefix the assembly code with 0xFFs, which means there is no method header.
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.byte 0xFF, 0xFF, 0xFF, 0xFF
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// Cache alignment for function entry.
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.balign 16, 0xFF
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END_MACRO
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MACRO2(DEFINE_FUNCTION_CUSTOM_CFA, c_name, cfa_offset)
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FUNCTION_TYPE(SYMBOL(\c_name))
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ASM_HIDDEN CALLVAR(c_name)
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.globl CALLVAR(c_name)
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ALIGN_FUNCTION_ENTRY
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CALLVAR(c_name):
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CFI_STARTPROC
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// Ensure we get an appropriate starting CFA.
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CFI_DEF_CFA(esp, RAW_VAR(cfa_offset))
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END_MACRO
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MACRO1(DEFINE_FUNCTION, c_name)
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DEFINE_FUNCTION_CUSTOM_CFA RAW_VAR(c_name), __SIZEOF_POINTER__
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END_MACRO
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MACRO1(END_FUNCTION, c_name)
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CFI_ENDPROC
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SIZE(SYMBOL(\c_name))
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END_MACRO
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MACRO1(PUSH, reg)
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pushl REG_VAR(reg)
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CFI_ADJUST_CFA_OFFSET(4)
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CFI_REL_OFFSET(REG_VAR(reg), 0)
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END_MACRO
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MACRO1(POP, reg)
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popl REG_VAR(reg)
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CFI_ADJUST_CFA_OFFSET(-4)
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CFI_RESTORE(REG_VAR(reg))
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END_MACRO
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// Arguments do not need .cfi_rel_offset as they are caller-saved and
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// therefore cannot hold caller's variables or unwinding data.
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MACRO1(PUSH_ARG, reg)
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pushl REG_VAR(reg)
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CFI_ADJUST_CFA_OFFSET(4)
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END_MACRO
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MACRO1(POP_ARG, reg)
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popl REG_VAR(reg)
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CFI_ADJUST_CFA_OFFSET(-4)
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END_MACRO
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MACRO1(CFI_RESTORE_REG, reg)
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CFI_RESTORE(REG_VAR(reg))
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END_MACRO
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MACRO1(INCREASE_FRAME, frame_adjustment)
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subl MACRO_LITERAL(RAW_VAR(frame_adjustment)), %esp
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CFI_ADJUST_CFA_OFFSET((RAW_VAR(frame_adjustment)))
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END_MACRO
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MACRO1(DECREASE_FRAME, frame_adjustment)
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addl MACRO_LITERAL(RAW_VAR(frame_adjustment)), %esp
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CFI_ADJUST_CFA_OFFSET(-(RAW_VAR(frame_adjustment)))
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END_MACRO
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#define UNREACHABLE int3
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MACRO1(UNIMPLEMENTED,name)
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FUNCTION_TYPE(\name)
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.globl VAR(name)
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ALIGN_FUNCTION_ENTRY
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VAR(name):
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CFI_STARTPROC
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UNREACHABLE
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UNREACHABLE
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CFI_ENDPROC
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SIZE(\name)
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END_MACRO
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MACRO1(SETUP_GOT_NOSAVE, got_reg)
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#ifndef __APPLE__
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.ifc VAR(got_reg), ebx
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call __x86.get_pc_thunk.bx
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addl $_GLOBAL_OFFSET_TABLE_, %ebx
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.else
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.error "Unknown GOT register \got_reg"
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.endif
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#endif
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END_MACRO
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MACRO2(LOAD_RUNTIME_INSTANCE, reg, got_reg)
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SETUP_GOT_NOSAVE \got_reg
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// Load Runtime::instance_ from GOT.
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movl SYMBOL(_ZN3art7Runtime9instance_E)@GOT(REG_VAR(got_reg)), REG_VAR(reg)
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movl (REG_VAR(reg)), REG_VAR(reg)
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END_MACRO
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// Macros to poison (negate) the reference for heap poisoning.
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MACRO1(POISON_HEAP_REF, rRef)
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#ifdef USE_HEAP_POISONING
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neg REG_VAR(rRef)
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#endif // USE_HEAP_POISONING
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END_MACRO
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// Macros to unpoison (negate) the reference for heap poisoning.
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MACRO1(UNPOISON_HEAP_REF, rRef)
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#ifdef USE_HEAP_POISONING
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neg REG_VAR(rRef)
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#endif // USE_HEAP_POISONING
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END_MACRO
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/*
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* Macro that sets up the callee save frame to conform with
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* Runtime::CreateCalleeSaveMethod(kSaveRefsAndArgs), except for pushing the method
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*/
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MACRO0(SETUP_SAVE_REFS_AND_ARGS_FRAME_REGISTERS_ONLY)
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PUSH edi // Save callee saves
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PUSH esi
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PUSH ebp
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PUSH_ARG ebx // Save args.
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PUSH_ARG edx
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PUSH_ARG ecx
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// Create space for FPR args.
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INCREASE_FRAME 4 * 8
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// Save FPRs.
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movsd %xmm0, 0(%esp)
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movsd %xmm1, 8(%esp)
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movsd %xmm2, 16(%esp)
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movsd %xmm3, 24(%esp)
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// Ugly compile-time check, but we only have the preprocessor.
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// First +4: implicit return address pushed on stack when caller made call.
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// Last +4: we're not pushing the method on the stack here.
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#if (FRAME_SIZE_SAVE_REFS_AND_ARGS != 4 + 6*4 + 4*8 + 4)
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#error "FRAME_SIZE_SAVE_REFS_AND_ARGS(X86) size not as expected."
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#endif
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END_MACRO
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MACRO0(RESTORE_SAVE_REFS_AND_ARGS_FRAME)
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// Restore FPRs. EAX is still on the stack.
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movsd 4(%esp), %xmm0
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movsd 12(%esp), %xmm1
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movsd 20(%esp), %xmm2
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movsd 28(%esp), %xmm3
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DECREASE_FRAME 36 // Remove FPRs and method pointer.
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POP_ARG ecx // Restore args
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POP_ARG edx
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POP_ARG ebx
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POP ebp // Restore callee saves
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POP esi
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POP edi
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END_MACRO
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/*
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* Macro that calls through to artDeliverPendingExceptionFromCode, where the pending
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* exception is Thread::Current()->exception_ when the runtime method frame is ready.
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*/
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MACRO0(DELIVER_PENDING_EXCEPTION_FRAME_READY)
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// Outgoing argument set up
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INCREASE_FRAME 12 // alignment padding
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pushl %fs:THREAD_SELF_OFFSET // pass Thread::Current()
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CFI_ADJUST_CFA_OFFSET(4)
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call SYMBOL(artDeliverPendingExceptionFromCode) // artDeliverPendingExceptionFromCode(Thread*)
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UNREACHABLE
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CFI_ADJUST_CFA_OFFSET(-16) // Reset CFA in case there is more code afterwards.
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END_MACRO
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#endif // ART_RUNTIME_ARCH_X86_ASM_SUPPORT_X86_S_
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