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/*-
* SPDX-License-Identifier: BSD-4-Clause
*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
* Copyright (C) 1995, 1996 TooLs GmbH.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $NetBSD: asm.h,v 1.6.18.1 2000/07/25 08:37:14 kleink Exp $
*/
#ifndef _MACHINE_ASM_H_
#define _MACHINE_ASM_H_
#include <sys/cdefs.h>
#if defined(PIC) && !defined(__powerpc64__)
#define PIC_PROLOGUE XXX
#define PIC_EPILOGUE XXX
#define PIC_PLT(x) x@plt
#ifdef __STDC__
#define PIC_GOT(x) XXX
#else /* not __STDC__ */
#define PIC_GOT(x) XXX
#endif /* __STDC__ */
#else
#define PIC_PROLOGUE
#define PIC_EPILOGUE
#define PIC_PLT(x) x
#define PIC_GOT(x) x
#endif
#define CNAME(csym) csym
#define ASMNAME(asmsym) asmsym
#ifdef __powerpc64__
#define HIDENAME(asmsym) __CONCAT(_,asmsym)
#else
#define HIDENAME(asmsym) __CONCAT(.,asmsym)
#endif
#if !defined(_CALL_ELF) || _CALL_ELF == 1
#ifdef _KERNEL
/* ELFv1 kernel uses global dot symbols */
#define DOT_LABEL(name) __CONCAT(.,name)
#define TYPE_ENTRY(name) .size name,24; \
.type DOT_LABEL(name),@function; \
.globl DOT_LABEL(name);
#define END_SIZE(name) .size DOT_LABEL(name),.-DOT_LABEL(name);
#else /* !_KERNEL */
/* ELFv1 user code uses local function entry points */
#define DOT_LABEL(name) __CONCAT(.L.,name)
#define TYPE_ENTRY(name) .type name,@function;
#define END_SIZE(name) .size name,.-DOT_LABEL(name);
#endif /* _KERNEL */
#else
/* ELFv2 doesn't have any of this complication */
#define DOT_LABEL(name) name
#define TYPE_ENTRY(name) .type name,@function;
#define END_SIZE(name) .size name,.-DOT_LABEL(name);
#endif
#define _GLOBAL(name) \
.data; \
.p2align 2; \
.globl name; \
name:
#ifdef __powerpc64__
#define TOC_NAME_FOR_REF(name) __CONCAT(.L,name)
#define TOC_REF(name) TOC_NAME_FOR_REF(name)@toc
#define TOC_ENTRY(name) \
.section ".toc","aw"; \
TOC_NAME_FOR_REF(name): \
.tc name[TC],name
#endif
#ifdef __powerpc64__
#if !defined(_CALL_ELF) || _CALL_ELF == 1
#define _ENTRY(name) \
.section ".text"; \
.p2align 2; \
.globl name; \
.section ".opd","aw"; \
.p2align 3; \
name: \
.quad DOT_LABEL(name),.TOC.@tocbase,0; \
.previous; \
.p2align 4; \
TYPE_ENTRY(name) \
DOT_LABEL(name): \
.cfi_startproc
#define _NAKED_ENTRY(name) _ENTRY(name)
#else
#define _ENTRY(name) \
.text; \
.p2align 4; \
.globl name; \
.type name,@function; \
name: \
.cfi_startproc; \
addis %r2, %r12, (.TOC.-name)@ha; \
addi %r2, %r2, (.TOC.-name)@l; \
.localentry name, .-name;
/* "Naked" function entry. No TOC prologue for ELFv2. */
#define _NAKED_ENTRY(name) \
.text; \
.p2align 4; \
.globl name; \
.type name,@function; \
name: \
.cfi_startproc; \
.localentry name, .-name;
#endif
#define _END(name) \
.cfi_endproc; \
.long 0; \
.byte 0,0,0,0,0,0,0,0; \
END_SIZE(name)
#define LOAD_ADDR(reg, var) \
lis reg, var@highest; \
ori reg, reg, var@higher; \
rldicr reg, reg, 32, 31; \
oris reg, reg, var@h; \
ori reg, reg, var@l;
#else /* !__powerpc64__ */
#define _ENTRY(name) \
.text; \
.p2align 4; \
.globl name; \
.type name,@function; \
name: \
.cfi_startproc
#define _END(name) \
.cfi_endproc; \
.size name, . - name
#define _NAKED_ENTRY(name) _ENTRY(name)
#define LOAD_ADDR(reg, var) \
lis reg, var@ha; \
ori reg, reg, var@l;
#endif /* __powerpc64__ */
#if defined(PROF) || (defined(_KERNEL) && defined(GPROF))
# ifdef __powerpc64__
# define _PROF_PROLOGUE mflr 0; \
std 3,48(1); \
std 4,56(1); \
std 5,64(1); \
std 0,16(1); \
stdu 1,-112(1); \
bl _mcount; \
nop; \
ld 0,112+16(1); \
ld 3,112+48(1); \
ld 4,112+56(1); \
ld 5,112+64(1); \
mtlr 0; \
addi 1,1,112
# else
# define _PROF_PROLOGUE mflr 0; stw 0,4(1); bl _mcount
# endif
#else
# define _PROF_PROLOGUE
#endif
#define ASEND(y) _END(ASMNAME(y))
#define ASENTRY(y) _ENTRY(ASMNAME(y)); _PROF_PROLOGUE
#define END(y) _END(CNAME(y))
#define ENTRY(y) _ENTRY(CNAME(y)); _PROF_PROLOGUE
#define GLOBAL(y) _GLOBAL(CNAME(y))
#define ASENTRY_NOPROF(y) _ENTRY(ASMNAME(y))
#define ENTRY_NOPROF(y) _ENTRY(CNAME(y))
/* Load NIA without affecting branch prediction */
#define LOAD_LR_NIA bcl 20, 31, .+4
/*
* Magic sequence to return to native endian.
* Overwrites r0 and r11.
*
* The encoding of the instruction "tdi 0, %r0, 0x48" in opposite endian
* happens to be "b . + 8". This is useful because we can write a sequence
* of instructions that can execute in either endian.
*
* Use a sequence of handcoded instructions that switches contexts to the
* instruction following the sequence, but with the correct PSL_LE bit.
*
* The same sequence works for both BE and LE because the xori will flip
* the bit to the other state, and the code only runs when running in the
* wrong endian.
*
* This sequence is NMI-reentrant.
*
* Do not change the length of this sequence without looking at the users,
* this is used in size-constrained places like the reset vector!
*/
#define RETURN_TO_NATIVE_ENDIAN \
tdi 0, %r0, 0x48; /* Endian swapped: b . + 8 */\
b 1f; /* Will fall through to here if correct */\
.long 0xa600607d; /* mfmsr %r11 */\
.long 0x00000038; /* li %r0, 0 */\
.long 0x6401617d; /* mtmsrd %r0, 1 (L=1 EE,RI bits only) */\
.long 0x01006b69; /* xori %r11, %r11, 0x1 (PSL_LE) */\
.long 0xa602087c; /* mflr %r0 */\
.long 0x05009f42; /* LOAD_LR_NIA */\
.long 0xa6037b7d; /* 0: mtsrr1 %r11 */\
.long 0xa602687d; /* mflr %r11 */\
.long 0x18006b39; /* addi %r11, %r11, (1f - 0b) */\
.long 0xa6037a7d; /* mtsrr0 %r11 */\
.long 0xa603087c; /* mtlr %r0 */\
.long 0x2400004c; /* rfid */\
1: /* RETURN_TO_NATIVE_ENDIAN */
#define ASMSTR .asciz
#define RCSID(x) .text; .asciz x
#undef __FBSDID
#if !defined(lint) && !defined(STRIP_FBSDID)
#define __FBSDID(s) .ident s
#else
#define __FBSDID(s) /* nothing */
#endif /* not lint and not STRIP_FBSDID */
#define WEAK_REFERENCE(sym, alias) \
.weak alias; \
.equ alias,sym
#ifdef __STDC__
#define WARN_REFERENCES(_sym,_msg) \
.section .gnu.warning. ## _sym ; .ascii _msg ; .text
#else
#define WARN_REFERENCES(_sym,_msg) \
.section .gnu.warning./**/_sym ; .ascii _msg ; .text
#endif /* __STDC__ */
#endif /* !_MACHINE_ASM_H_ */
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