Annotation of sys/arch/sh/include/asm.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: asm.h,v 1.1.1.1 2006/10/06 21:02:55 miod Exp $ */
! 2: /* $NetBSD: asm.h,v 1.25 2006/01/20 22:02:40 christos Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1990 The Regents of the University of California.
! 6: * All rights reserved.
! 7: *
! 8: * This code is derived from software contributed to Berkeley by
! 9: * William Jolitz.
! 10: *
! 11: * Redistribution and use in source and binary forms, with or without
! 12: * modification, are permitted provided that the following conditions
! 13: * are met:
! 14: * 1. Redistributions of source code must retain the above copyright
! 15: * notice, this list of conditions and the following disclaimer.
! 16: * 2. Redistributions in binary form must reproduce the above copyright
! 17: * notice, this list of conditions and the following disclaimer in the
! 18: * documentation and/or other materials provided with the distribution.
! 19: * 3. Neither the name of the University nor the names of its contributors
! 20: * may be used to endorse or promote products derived from this software
! 21: * without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 33: * SUCH DAMAGE.
! 34: *
! 35: * @(#)asm.h 5.5 (Berkeley) 5/7/91
! 36: */
! 37:
! 38: #ifndef _SH_ASM_H_
! 39: #define _SH_ASM_H_
! 40:
! 41: #ifdef __ELF__
! 42: # define _C_LABEL(x) x
! 43: #else
! 44: #ifdef __STDC__
! 45: # define _C_LABEL(x) _ ## x
! 46: #else
! 47: # define _C_LABEL(x) _/**/x
! 48: #endif
! 49: #endif
! 50: #define _ASM_LABEL(x) x
! 51:
! 52: #ifdef __STDC__
! 53: # define __CONCAT(x,y) x ## y
! 54: # define __STRING(x) #x
! 55: #else
! 56: # define __CONCAT(x,y) x/**/y
! 57: # define __STRING(x) "x"
! 58: #endif
! 59:
! 60: /* let kernels and others override entrypoint alignment */
! 61: #ifndef _ALIGN_TEXT
! 62: # define _ALIGN_TEXT .align 2
! 63: #endif
! 64:
! 65: #ifdef __ELF__
! 66: #define _ENTRY(x) \
! 67: .text ;\
! 68: _ALIGN_TEXT ;\
! 69: .globl x ;\
! 70: .type x,@function ;\
! 71: x:
! 72: #else /* !__ELF__ */
! 73: #define _ENTRY(x) \
! 74: .text ;\
! 75: _ALIGN_TEXT ;\
! 76: .globl x ;\
! 77: x:
! 78: #endif /* !__ELF__ */
! 79:
! 80: #ifdef GPROF
! 81: #define _PROF_PROLOGUE \
! 82: mov.l 1f,r1 ; \
! 83: mova 2f,r0 ; \
! 84: jmp @r1 ; \
! 85: nop ; \
! 86: .align 2 ; \
! 87: 1: .long __mcount ; \
! 88: 2:
! 89: #else /* !GPROF */
! 90: #define _PROF_PROLOGUE
! 91: #endif /* !GPROF */
! 92:
! 93: #define ENTRY(y) _ENTRY(_C_LABEL(y)) _PROF_PROLOGUE
! 94: #define NENTRY(y) _ENTRY(_C_LABEL(y))
! 95: #define ASENTRY(y) _ENTRY(_ASM_LABEL(y)) _PROF_PROLOGUE
! 96:
! 97: #define SET_ENTRY_SIZE(y) \
! 98: .size _C_LABEL(y), . - _C_LABEL(y)
! 99:
! 100: #define SET_ASENTRY_SIZE(y) \
! 101: .size _ASM_LABEL(y), . - _ASM_LABEL(y)
! 102:
! 103: #ifdef __ELF__
! 104: #define ALTENTRY(name) \
! 105: .globl _C_LABEL(name) ;\
! 106: .type _C_LABEL(name),@function ;\
! 107: _C_LABEL(name):
! 108: #else
! 109: #define ALTENTRY(name) \
! 110: .globl _C_LABEL(name) ;\
! 111: _C_LABEL(name):
! 112: #endif
! 113:
! 114:
! 115: /*
! 116: * Hide the gory details of PIC calls vs. normal calls. Use as in the
! 117: * following example:
! 118: *
! 119: * sts.l pr, @-sp
! 120: * PIC_PROLOGUE(.L_got, r0) ! saves old r12 on stack
! 121: * ...
! 122: * mov.l .L_function_1, r0
! 123: * 1: CALL r0 ! each call site needs a label
! 124: * nop
! 125: * ...
! 126: * mov.l .L_function_2, r0
! 127: * 2: CALL r0
! 128: * nop
! 129: * ...
! 130: * PIC_EPILOGUE ! restores r12 from stack
! 131: * lds.l @sp+, pr ! so call in right order
! 132: * rts
! 133: * nop
! 134: *
! 135: * .align 2
! 136: * .L_got:
! 137: * PIC_GOT_DATUM
! 138: * .L_function_1: ! if you call the same function twice
! 139: * CALL_DATUM(function, 1b) ! provide call datum for each call
! 140: * .L_function_2:
! 141: * CALL_DATUM(function, 2b)
! 142: */
! 143:
! 144: #ifdef PIC
! 145:
! 146: #define PIC_PLT(x) x@PLT
! 147: #define PIC_GOT(x) x@GOT
! 148: #define PIC_GOTOFF(x) x@GOTOFF
! 149:
! 150: #define PIC_PROLOGUE(got) \
! 151: mov.l r12, @-sp; \
! 152: PIC_PROLOGUE_NOSAVE(got)
! 153:
! 154: /*
! 155: * Functions that do non local jumps don't need to preserve r12,
! 156: * so we can shave off two instructions to save/restore it.
! 157: */
! 158: #define PIC_PROLOGUE_NOSAVE(got) \
! 159: mov.l got, r12; \
! 160: mova got, r0; \
! 161: add r0, r12
! 162:
! 163: #define PIC_EPILOGUE \
! 164: mov.l @sp+, r12
! 165:
! 166: #define PIC_EPILOGUE_SLOT \
! 167: PIC_EPILOGUE
! 168:
! 169: #define PIC_GOT_DATUM \
! 170: .long _GLOBAL_OFFSET_TABLE_
! 171:
! 172: #define CALL bsrf
! 173: #define JUMP braf
! 174:
! 175: #define CALL_DATUM(function, lpcs) \
! 176: .long PIC_PLT(function) - ((lpcs) + 4 - (.))
! 177:
! 178: /*
! 179: * This will result in text relocations in the shared library,
! 180: * unless the function is local or has hidden or protected visibility.
! 181: * Does not require PIC prologue.
! 182: */
! 183: #define CALL_DATUM_LOCAL(function, lpcs) \
! 184: .long function - ((lpcs) + 4)
! 185:
! 186: #else /* !PIC */
! 187:
! 188: #define PIC_PROLOGUE(label)
! 189: #define PIC_PROLOGUE_NOSAVE(label)
! 190: #define PIC_EPILOGUE
! 191: #define PIC_EPILOGUE_SLOT nop
! 192: #define PIC_GOT_DATUM
! 193:
! 194: #define CALL jsr @
! 195: #define JUMP jmp @
! 196:
! 197: #define CALL_DATUM(function, lpcs) \
! 198: .long function
! 199:
! 200: #define CALL_DATUM_LOCAL(function, lpcs) \
! 201: .long function
! 202:
! 203: #endif /* !PIC */
! 204:
! 205:
! 206: #define ASMSTR .asciz
! 207:
! 208: #ifdef __ELF__
! 209: #define WEAK_ALIAS(alias,sym) \
! 210: .weak _C_LABEL(alias); \
! 211: _C_LABEL(alias) = _C_LABEL(sym)
! 212: #endif
! 213:
! 214: #define WARN_REFERENCES(_sym,_msg) \
! 215: .section .gnu.warning._sym; .ascii _msg; .previous
! 216:
! 217: #endif /* !_SH_ASM_H_ */
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