335 lines
7.3 KiB
NASM
335 lines
7.3 KiB
NASM
;
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; Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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;
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; Use of this source code is governed by a BSD-style license
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; that can be found in the LICENSE file in the root of the source
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; tree. An additional intellectual property rights grant can be found
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; in the file PATENTS. All contributing project authors may
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; be found in the AUTHORS file in the root of the source tree.
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;
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%include "vpx_config.asm"
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; 32/64 bit compatibility macros
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;
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; In general, we make the source use 64 bit syntax, then twiddle with it using
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; the preprocessor to get the 32 bit syntax on 32 bit platforms.
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;
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%ifidn __OUTPUT_FORMAT__,elf32
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%define ABI_IS_32BIT 1
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%elifidn __OUTPUT_FORMAT__,macho32
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%define ABI_IS_32BIT 1
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%elifidn __OUTPUT_FORMAT__,win32
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%define ABI_IS_32BIT 1
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%elifidn __OUTPUT_FORMAT__,aout
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%define ABI_IS_32BIT 1
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%else
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%define ABI_IS_32BIT 0
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%endif
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%if ABI_IS_32BIT
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%define rax eax
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%define rbx ebx
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%define rcx ecx
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%define rdx edx
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%define rsi esi
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%define rdi edi
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%define rsp esp
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%define rbp ebp
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%define movsxd mov
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%macro movq 2
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%ifidn %1,eax
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movd %1,%2
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%elifidn %2,eax
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movd %1,%2
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%elifidn %1,ebx
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movd %1,%2
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%elifidn %2,ebx
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movd %1,%2
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%elifidn %1,ecx
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movd %1,%2
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%elifidn %2,ecx
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movd %1,%2
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%elifidn %1,edx
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movd %1,%2
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%elifidn %2,edx
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movd %1,%2
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%elifidn %1,esi
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movd %1,%2
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%elifidn %2,esi
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movd %1,%2
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%elifidn %1,edi
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movd %1,%2
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%elifidn %2,edi
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movd %1,%2
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%elifidn %1,esp
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movd %1,%2
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%elifidn %2,esp
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movd %1,%2
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%elifidn %1,ebp
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movd %1,%2
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%elifidn %2,ebp
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movd %1,%2
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%else
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movq %1,%2
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%endif
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%endmacro
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%endif
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; sym()
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; Return the proper symbol name for the target ABI.
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;
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; Certain ABIs, notably MS COFF and Darwin MACH-O, require that symbols
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; with C linkage be prefixed with an underscore.
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;
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%ifidn __OUTPUT_FORMAT__,elf32
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%define sym(x) x
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%elifidn __OUTPUT_FORMAT__,elf64
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%define sym(x) x
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%elifidn __OUTPUT_FORMAT__,x64
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%define sym(x) x
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%else
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%define sym(x) _ %+ x
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%endif
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; arg()
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; Return the address specification of the given argument
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;
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%if ABI_IS_32BIT
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%define arg(x) [ebp+8+4*x]
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%else
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; 64 bit ABI passes arguments in registers. This is a workaround to get up
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; and running quickly. Relies on SHADOW_ARGS_TO_STACK
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%ifidn __OUTPUT_FORMAT__,x64
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%define arg(x) [rbp+16+8*x]
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%else
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%define arg(x) [rbp-8-8*x]
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%endif
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%endif
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; REG_SZ_BYTES, REG_SZ_BITS
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; Size of a register
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%if ABI_IS_32BIT
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%define REG_SZ_BYTES 4
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%define REG_SZ_BITS 32
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%else
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%define REG_SZ_BYTES 8
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%define REG_SZ_BITS 64
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%endif
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; ALIGN_STACK <alignment> <register>
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; This macro aligns the stack to the given alignment (in bytes). The stack
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; is left such that the previous value of the stack pointer is the first
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; argument on the stack (ie, the inverse of this macro is 'pop rsp.')
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; This macro uses one temporary register, which is not preserved, and thus
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; must be specified as an argument.
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%macro ALIGN_STACK 2
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mov %2, rsp
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and rsp, -%1
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lea rsp, [rsp - (%1 - REG_SZ_BYTES)]
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push %2
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%endmacro
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;
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; The Microsoft assembler tries to impose a certain amount of type safety in
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; its register usage. YASM doesn't recognize these directives, so we just
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; %define them away to maintain as much compatibility as possible with the
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; original inline assembler we're porting from.
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;
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%idefine PTR
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%idefine XMMWORD
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%idefine MMWORD
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; PIC macros
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;
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%if ABI_IS_32BIT
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%if CONFIG_PIC=1
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%ifidn __OUTPUT_FORMAT__,elf32
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%define GET_GOT_SAVE_ARG 1
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%define WRT_PLT wrt ..plt
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%macro GET_GOT 1
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extern _GLOBAL_OFFSET_TABLE_
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push %1
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call %%get_got
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%%sub_offset:
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jmp %%exitGG
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%%get_got:
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mov %1, [esp]
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add %1, _GLOBAL_OFFSET_TABLE_ + $$ - %%sub_offset wrt ..gotpc
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ret
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%%exitGG:
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%undef GLOBAL
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%define GLOBAL(x) x + %1 wrt ..gotoff
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%undef RESTORE_GOT
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%define RESTORE_GOT pop %1
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%endmacro
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%elifidn __OUTPUT_FORMAT__,macho32
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%define GET_GOT_SAVE_ARG 1
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%macro GET_GOT 1
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push %1
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call %%get_got
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%%get_got:
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pop %1
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%undef GLOBAL
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%define GLOBAL(x) x + %1 - %%get_got
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%undef RESTORE_GOT
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%define RESTORE_GOT pop %1
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%endmacro
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%endif
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%endif
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%define HIDDEN_DATA(x) x
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%else
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%macro GET_GOT 1
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%endmacro
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%define GLOBAL(x) rel x
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%ifidn __OUTPUT_FORMAT__,elf64
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%define WRT_PLT wrt ..plt
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%define HIDDEN_DATA(x) x:data hidden
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%else
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%define HIDDEN_DATA(x) x
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%endif
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%endif
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%ifnmacro GET_GOT
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%macro GET_GOT 1
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%endmacro
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%define GLOBAL(x) x
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%endif
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%ifndef RESTORE_GOT
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%define RESTORE_GOT
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%endif
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%ifndef WRT_PLT
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%define WRT_PLT
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%endif
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%if ABI_IS_32BIT
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%macro SHADOW_ARGS_TO_STACK 1
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%endm
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%define UNSHADOW_ARGS
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%else
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%ifidn __OUTPUT_FORMAT__,x64
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%macro SHADOW_ARGS_TO_STACK 1 ; argc
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%if %1 > 0
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mov arg(0),rcx
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%endif
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%if %1 > 1
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mov arg(1),rdx
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%endif
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%if %1 > 2
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mov arg(2),r8
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%endif
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%if %1 > 3
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mov arg(3),r9
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%endif
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%endm
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%else
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%macro SHADOW_ARGS_TO_STACK 1 ; argc
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%if %1 > 0
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push rdi
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%endif
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%if %1 > 1
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push rsi
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%endif
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%if %1 > 2
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push rdx
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%endif
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%if %1 > 3
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push rcx
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%endif
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%if %1 > 4
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push r8
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%endif
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%if %1 > 5
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push r9
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%endif
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%if %1 > 6
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%assign i %1-6
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%assign off 16
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%rep i
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mov rax,[rbp+off]
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push rax
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%assign off off+8
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%endrep
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%endif
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%endm
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%endif
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%define UNSHADOW_ARGS mov rsp, rbp
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%endif
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; Win64 ABI requires that XMM6:XMM15 are callee saved
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; SAVE_XMM n, [u]
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; store registers 6-n on the stack
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; if u is specified, use unaligned movs.
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; Win64 ABI requires 16 byte stack alignment, but then pushes an 8 byte return
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; value. Typically we follow this up with 'push rbp' - re-aligning the stack -
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; but in some cases this is not done and unaligned movs must be used.
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%ifidn __OUTPUT_FORMAT__,x64
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%macro SAVE_XMM 1-2 a
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%if %1 < 6
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%error Only xmm registers 6-15 must be preserved
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%else
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%assign last_xmm %1
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%define movxmm movdq %+ %2
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%assign xmm_stack_space ((last_xmm - 5) * 16)
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sub rsp, xmm_stack_space
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%assign i 6
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%rep (last_xmm - 5)
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movxmm [rsp + ((i - 6) * 16)], xmm %+ i
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%assign i i+1
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%endrep
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%endif
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%endmacro
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%macro RESTORE_XMM 0
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%ifndef last_xmm
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%error RESTORE_XMM must be paired with SAVE_XMM n
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%else
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%assign i last_xmm
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%rep (last_xmm - 5)
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movxmm xmm %+ i, [rsp +((i - 6) * 16)]
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%assign i i-1
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%endrep
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add rsp, xmm_stack_space
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; there are a couple functions which return from multiple places.
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; otherwise, we could uncomment these:
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; %undef last_xmm
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; %undef xmm_stack_space
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; %undef movxmm
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%endif
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%endmacro
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%else
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%macro SAVE_XMM 1-2
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%endmacro
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%macro RESTORE_XMM 0
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%endmacro
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%endif
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; Name of the rodata section
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;
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; .rodata seems to be an elf-ism, as it doesn't work on OSX.
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;
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%ifidn __OUTPUT_FORMAT__,macho64
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%define SECTION_RODATA section .text
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%elifidn __OUTPUT_FORMAT__,macho32
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%macro SECTION_RODATA 0
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section .text
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%endmacro
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%elifidn __OUTPUT_FORMAT__,aout
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%define SECTION_RODATA section .data
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%else
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%define SECTION_RODATA section .rodata
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%endif
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; Tell GNU ld that we don't require an executable stack.
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%ifidn __OUTPUT_FORMAT__,elf32
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section .note.GNU-stack noalloc noexec nowrite progbits
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section .text
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%elifidn __OUTPUT_FORMAT__,elf64
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section .note.GNU-stack noalloc noexec nowrite progbits
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section .text
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%endif
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