freebsd-nq/sys/mips/include/asm.h

554 lines
14 KiB
C
Raw Normal View History

/* $NetBSD: asm.h,v 1.29 2000/12/14 21:29:51 jeffs Exp $ */
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell.
*
* 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.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS 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.
*
* @(#)machAsmDefs.h 8.1 (Berkeley) 6/10/93
* JNPR: asm.h,v 1.10 2007/08/09 11:23:32 katta
* $FreeBSD$
*/
/*
* machAsmDefs.h --
*
* Macros used when writing assembler programs.
*
* Copyright (C) 1989 Digital Equipment Corporation.
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies.
* Digital Equipment Corporation makes no representations about the
* suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* from: Header: /sprite/src/kernel/mach/ds3100.md/RCS/machAsmDefs.h,
* v 1.2 89/08/15 18:28:24 rab Exp SPRITE (DECWRL)
*/
#ifndef _MACHINE_ASM_H_
#define _MACHINE_ASM_H_
#ifndef NO_REG_DEFS
#include <machine/regdef.h>
#endif
#include <machine/endian.h>
#undef __FBSDID
#if !defined(lint) && !defined(STRIP_FBSDID)
#define __FBSDID(s) .ident s
#else
#define __FBSDID(s) /* nothing */
#endif
/*
* Define -pg profile entry code.
* Must always be noreorder, must never use a macro instruction
* Final addiu to t9 must always equal the size of this _KERN_MCOUNT
*/
#define _KERN_MCOUNT \
.set push; \
.set noreorder; \
.set noat; \
subu sp,sp,16; \
sw t9,12(sp); \
move AT,ra; \
lui t9,%hi(_mcount); \
addiu t9,t9,%lo(_mcount); \
jalr t9; \
nop; \
lw t9,4(sp); \
addiu sp,sp,8; \
addiu t9,t9,40; \
.set pop;
#ifdef GPROF
#define MCOUNT _KERN_MCOUNT
#else
#define MCOUNT
#endif
#define _C_LABEL(x) x
/*
* Endian-independent assembly-code aliases for unaligned memory accesses.
*/
#if BYTE_ORDER == LITTLE_ENDIAN
#define LWLO lwl
#define LWHI lwr
#define SWLO swl
#define SWHI swr
#endif
#if BYTE_ORDER == BIG_ENDIAN
#define LWLO lwr
#define LWHI lwl
#define SWLO swr
#define SWHI swl
#endif
#ifdef USE_AENT
#define AENT(x) \
.aent x, 0
#else
#define AENT(x)
#endif
/*
* WARN_REFERENCES: create a warning if the specified symbol is referenced
*/
#define WARN_REFERENCES(_sym,_msg) \
.section .gnu.warning. ## _sym ; .ascii _msg ; .text
/*
* These are temp registers whose names can be used in either the old
* or new ABI, although they map to different physical registers. In
* the old ABI, they map to t4-t7, and in the new ABI, they map to a4-a7.
*
* Because they overlap with the last 4 arg regs in the new ABI, ta0-ta3
* should be used only when we need more than t0-t3.
*/
#if defined(__mips_n32) || defined(__mips_n64)
#define ta0 $8
#define ta1 $9
#define ta2 $10
#define ta3 $11
#else
#define ta0 $12
#define ta1 $13
#define ta2 $14
#define ta3 $15
#endif /* __mips_n32 || __mips_n64 */
#ifdef __ELF__
# define _C_LABEL(x) x
#else
# define _C_LABEL(x) _ ## x
#endif
/*
* WEAK_ALIAS: create a weak alias.
*/
#define WEAK_ALIAS(alias,sym) \
.weak alias; \
alias = sym
/*
* STRONG_ALIAS: create a strong alias.
*/
#define STRONG_ALIAS(alias,sym) \
.globl alias; \
alias = sym
#define GLOBAL(sym) \
.globl sym; sym:
#define ENTRY(sym) \
.text; .globl sym; .ent sym; sym:
#define ASM_ENTRY(sym) \
.text; .globl sym; .type sym,@function; sym:
/*
* LEAF
* A leaf routine does
* - call no other function,
* - never use any register that callee-saved (S0-S8), and
* - not use any local stack storage.
*/
#define LEAF(x) \
.globl _C_LABEL(x); \
.ent _C_LABEL(x), 0; \
_C_LABEL(x): ; \
.frame sp, 0, ra; \
MCOUNT
/*
* LEAF_NOPROFILE
* No profilable leaf routine.
*/
#define LEAF_NOPROFILE(x) \
.globl _C_LABEL(x); \
.ent _C_LABEL(x), 0; \
_C_LABEL(x): ; \
.frame sp, 0, ra
/*
* XLEAF
* declare alternate entry to leaf routine
*/
#define XLEAF(x) \
.globl _C_LABEL(x); \
AENT (_C_LABEL(x)); \
_C_LABEL(x):
/*
* NESTED
* A function calls other functions and needs
* therefore stack space to save/restore registers.
*/
#define NESTED(x, fsize, retpc) \
.globl _C_LABEL(x); \
.ent _C_LABEL(x), 0; \
_C_LABEL(x): ; \
.frame sp, fsize, retpc; \
MCOUNT
/*
* NESTED_NOPROFILE(x)
* No profilable nested routine.
*/
#define NESTED_NOPROFILE(x, fsize, retpc) \
.globl _C_LABEL(x); \
.ent _C_LABEL(x), 0; \
_C_LABEL(x): ; \
.frame sp, fsize, retpc
/*
* XNESTED
* declare alternate entry point to nested routine.
*/
#define XNESTED(x) \
.globl _C_LABEL(x); \
AENT (_C_LABEL(x)); \
_C_LABEL(x):
/*
* END
* Mark end of a procedure.
*/
#define END(x) \
.end _C_LABEL(x)
/*
* IMPORT -- import external symbol
*/
#define IMPORT(sym, size) \
.extern _C_LABEL(sym),size
/*
* EXPORT -- export definition of symbol
*/
#define EXPORT(x) \
.globl _C_LABEL(x); \
_C_LABEL(x):
/*
* VECTOR
* exception vector entrypoint
* XXX: regmask should be used to generate .mask
*/
#define VECTOR(x, regmask) \
.ent _C_LABEL(x),0; \
EXPORT(x); \
#define VECTOR_END(x) \
EXPORT(x ## End); \
END(x)
#define KSEG0TEXT_START
#define KSEG0TEXT_END
#define KSEG0TEXT .text
/*
* Macros to panic and printf from assembly language.
*/
#define PANIC(msg) \
la a0, 9f; \
jal _C_LABEL(panic); \
nop; \
MSG(msg)
#define PANIC_KSEG0(msg, reg) PANIC(msg)
#define PRINTF(msg) \
la a0, 9f; \
jal _C_LABEL(printf); \
nop; \
MSG(msg)
#define MSG(msg) \
.rdata; \
9: .asciiz msg; \
.text
#define ASMSTR(str) \
.asciiz str; \
.align 3
/*
* Call ast if required
*/
#define DO_AST \
44: \
la s0, _C_LABEL(disableintr) ;\
jalr s0 ;\
nop ;\
GET_CPU_PCPU(s1) ;\
lw s3, PC_CURPCB(s1) ;\
lw s1, PC_CURTHREAD(s1) ;\
lw s2, TD_FLAGS(s1) ;\
li s0, TDF_ASTPENDING | TDF_NEEDRESCHED;\
and s2, s0 ;\
la s0, _C_LABEL(enableintr) ;\
jalr s0 ;\
nop ;\
beq s2, zero, 4f ;\
nop ;\
la s0, _C_LABEL(ast) ;\
jalr s0 ;\
addu a0, s3, U_PCB_REGS ;\
j 44b ;\
nop ;\
4:
/*
* XXX retain dialects XXX
*/
#define ALEAF(x) XLEAF(x)
#define NLEAF(x) LEAF_NOPROFILE(x)
#define NON_LEAF(x, fsize, retpc) NESTED(x, fsize, retpc)
#define NNON_LEAF(x, fsize, retpc) NESTED_NOPROFILE(x, fsize, retpc)
/*
* standard callframe {
* register_t cf_args[4]; arg0 - arg3
* register_t cf_sp; frame pointer
* register_t cf_ra; return address
* };
*/
#define CALLFRAME_SIZ (4 * (4 + 2))
#define CALLFRAME_SP (4 * 4)
#define CALLFRAME_RA (4 * 5)
#define START_FRAME CALLFRAME_SIZ
/*
* While it would be nice to be compatible with the SGI
* REG_L and REG_S macros, because they do not take parameters, it
* is impossible to use them with the _MIPS_SIM_ABIX32 model.
*
* These macros hide the use of mips3 instructions from the
* assembler to prevent the assembler from generating 64-bit style
* ABI calls.
*/
#if !defined(_MIPS_BSD_API) || _MIPS_BSD_API == _MIPS_BSD_API_LP32
#define REG_L lw
#define REG_S sw
#define REG_LI li
#define REG_PROLOGUE .set push
#define REG_EPILOGUE .set pop
#define SZREG 4
#else
#define REG_L ld
#define REG_S sd
#define REG_LI dli
#define REG_PROLOGUE .set push ; .set mips3
#define REG_EPILOGUE .set pop
#define SZREG 8
#endif /* _MIPS_BSD_API */
#define mfc0_macro(data, spr) \
__asm __volatile ("mfc0 %0, $%1" \
: "=r" (data) /* outputs */ \
: "i" (spr)); /* inputs */
#define mtc0_macro(data, spr) \
__asm __volatile ("mtc0 %0, $%1" \
: /* outputs */ \
: "r" (data), "i" (spr)); /* inputs */
#define cfc0_macro(data, spr) \
__asm __volatile ("cfc0 %0, $%1" \
: "=r" (data) /* outputs */ \
: "i" (spr)); /* inputs */
#define ctc0_macro(data, spr) \
__asm __volatile ("ctc0 %0, $%1" \
: /* outputs */ \
: "r" (data), "i" (spr)); /* inputs */
#define lbu_macro(data, addr) \
__asm __volatile ("lbu %0, 0x0(%1)" \
: "=r" (data) /* outputs */ \
: "r" (addr)); /* inputs */
#define lb_macro(data, addr) \
__asm __volatile ("lb %0, 0x0(%1)" \
: "=r" (data) /* outputs */ \
: "r" (addr)); /* inputs */
#define lwl_macro(data, addr) \
__asm __volatile ("lwl %0, 0x0(%1)" \
: "=r" (data) /* outputs */ \
: "r" (addr)); /* inputs */
#define lwr_macro(data, addr) \
__asm __volatile ("lwr %0, 0x0(%1)" \
: "=r" (data) /* outputs */ \
: "r" (addr)); /* inputs */
#define ldl_macro(data, addr) \
__asm __volatile ("ldl %0, 0x0(%1)" \
: "=r" (data) /* outputs */ \
: "r" (addr)); /* inputs */
#define ldr_macro(data, addr) \
__asm __volatile ("ldr %0, 0x0(%1)" \
: "=r" (data) /* outputs */ \
: "r" (addr)); /* inputs */
#define sb_macro(data, addr) \
__asm __volatile ("sb %0, 0x0(%1)" \
: /* outputs */ \
: "r" (data), "r" (addr)); /* inputs */
#define swl_macro(data, addr) \
__asm __volatile ("swl %0, 0x0(%1)" \
: /* outputs */ \
: "r" (data), "r" (addr)); /* inputs */
#define swr_macro(data, addr) \
__asm __volatile ("swr %0, 0x0(%1)" \
: /* outputs */ \
: "r" (data), "r" (addr)); /* inputs */
#define sdl_macro(data, addr) \
__asm __volatile ("sdl %0, 0x0(%1)" \
: /* outputs */ \
: "r" (data), "r" (addr)); /* inputs */
#define sdr_macro(data, addr) \
__asm __volatile ("sdr %0, 0x0(%1)" \
: /* outputs */ \
: "r" (data), "r" (addr)); /* inputs */
#define mfgr_macro(data, gr) \
__asm __volatile ("move %0, $%1" \
: "=r" (data) /* outputs */ \
: "i" (gr)); /* inputs */
#define dmfc0_macro(data, spr) \
__asm __volatile ("dmfc0 %0, $%1" \
: "=r" (data) /* outputs */ \
: "i" (spr)); /* inputs */
#define dmtc0_macro(data, spr, sel) \
__asm __volatile ("dmtc0 %0, $%1, %2" \
: /* no outputs */ \
: "r" (data), "i" (spr), "i" (sel)); /* inputs */
/*
* The DYNAMIC_STATUS_MASK option adds an additional masking operation
* when updating the hardware interrupt mask in the status register.
*
* This is useful for platforms that need to at run-time mask
* interrupts based on motherboard configuration or to handle
* slowly clearing interrupts.
*
* XXX this is only currently implemented for mips3.
*/
#ifdef MIPS_DYNAMIC_STATUS_MASK
#define DYNAMIC_STATUS_MASK(sr,scratch) \
lw scratch, mips_dynamic_status_mask; \
and sr, sr, scratch
#define DYNAMIC_STATUS_MASK_TOUSER(sr,scratch1) \
ori sr, (MIPS_INT_MASK | MIPS_SR_INT_IE); \
DYNAMIC_STATUS_MASK(sr,scratch1)
#else
#define DYNAMIC_STATUS_MASK(sr,scratch)
#define DYNAMIC_STATUS_MASK_TOUSER(sr,scratch1)
#endif
#ifdef SMP
/*
* FREEBSD_DEVELOPERS_FIXME
* In multiprocessor case, store/retrieve the pcpu structure
* address for current CPU in scratch register for fast access.
*/
#error "Write GET_CPU_PCPU for SMP"
#else
#define GET_CPU_PCPU(reg) \
lw reg, _C_LABEL(pcpup);
#endif
/*
* Description of the setjmp buffer
*
* word 0 magic number (dependant on creator)
* 1 RA
* 2 S0
* 3 S1
* 4 S2
* 5 S3
* 6 S4
* 7 S5
* 8 S6
* 9 S7
* 10 SP
* 11 S8
* 12 signal mask (dependant on magic)
* 13 (con't)
* 14 (con't)
* 15 (con't)
*
* The magic number number identifies the jmp_buf and
* how the buffer was created as well as providing
* a sanity check
*
*/
#define _JB_MAGIC__SETJMP 0xBADFACED
#define _JB_MAGIC_SETJMP 0xFACEDBAD
/* Valid for all jmp_buf's */
#define _JB_MAGIC 0
#define _JB_REG_RA 1
#define _JB_REG_S0 2
#define _JB_REG_S1 3
#define _JB_REG_S2 4
#define _JB_REG_S3 5
#define _JB_REG_S4 6
#define _JB_REG_S5 7
#define _JB_REG_S6 8
#define _JB_REG_S7 9
#define _JB_REG_SP 10
#define _JB_REG_S8 11
/* Only valid with the _JB_MAGIC_SETJMP magic */
#define _JB_SIGMASK 12
#endif /* !_MACHINE_ASM_H_ */