Annotation of sys/arch/i386/i386/db_magic.s, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: db_magic.s,v 1.2 2003/04/17 03:42:14 drahn Exp $ */
! 2:
! 3: /*
! 4: * Mach Operating System
! 5: * Copyright (c) 1995 Carnegie Mellon University
! 6: * All Rights Reserved.
! 7: *
! 8: * Permission to use, copy, modify and distribute this software and its
! 9: * documentation is hereby granted, provided that both the copyright
! 10: * notice and this permission notice appear in all copies of the
! 11: * software, derivative works or modified versions, and any portions
! 12: * thereof, and that both notices appear in supporting documentation.
! 13: *
! 14: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
! 15: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
! 16: * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
! 17: *
! 18: * Carnegie Mellon requests users of this software to return to
! 19: *
! 20: * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
! 21: * School of Computer Science
! 22: * Carnegie Mellon University
! 23: * Pittsburgh PA 15213-3890
! 24: *
! 25: * any improvements or extensions that they make and grant Carnegie Mellon
! 26: * the rights to redistribute these changes.
! 27: */
! 28:
! 29: #include <machine/asm.h>
! 30: #define S_ARG0 4(%esp)
! 31: #define S_ARG1 8(%esp)
! 32: #define S_ARG2 12(%esp)
! 33: #define S_ARG3 16(%esp)
! 34: #define B_ARG0 8(%ebp)
! 35: #define B_ARG1 12(%ebp)
! 36: #define B_ARG2 16(%ebp)
! 37: #define B_ARG3 20(%ebp)
! 38: /*
! 39: * void outb(unsigned char *io_port,
! 40: * unsigned char byte)
! 41: *
! 42: * Output a byte to an IO port.
! 43: */
! 44: ENTRY(outb)
! 45: movl S_ARG0,%edx /* IO port address */
! 46: movl S_ARG1,%eax /* data to output */
! 47: outb %al,%dx /* send it out */
! 48: ret
! 49: /*
! 50: * unsigned char inb(unsigned char *io_port)
! 51: *
! 52: * Input a byte from an IO port.
! 53: */
! 54: ENTRY(inb)
! 55: movl S_ARG0,%edx /* IO port address */
! 56: xor %eax,%eax /* clear high bits of register */
! 57: inb %dx,%al /* get the byte */
! 58: ret
! 59: /*
! 60: * void outw(unsigned short *io_port,
! 61: * unsigned short word)
! 62: *
! 63: * Output a word to an IO port.
! 64: */
! 65: ENTRY(outw)
! 66: movl S_ARG0,%edx /* IO port address */
! 67: movl S_ARG1,%eax /* data to output */
! 68: outw %ax,%dx /* send it out */
! 69: ret
! 70: /*
! 71: * unsigned short inw(unsigned short *io_port)
! 72: *
! 73: * Input a word from an IO port.
! 74: */
! 75: ENTRY(inw)
! 76: movl S_ARG0,%edx /* IO port address */
! 77: xor %eax,%eax /* clear high bits of register */
! 78: inw %dx,%ax /* get the word */
! 79: ret
! 80: /*
! 81: * void outl(unsigned int *io_port,
! 82: * unsigned int byte)
! 83: *
! 84: * Output an int to an IO port.
! 85: */
! 86: ENTRY(outl)
! 87: movl S_ARG0,%edx /* IO port address */
! 88: movl S_ARG1,%eax /* data to output */
! 89: outl %eax,%dx /* send it out */
! 90: ret
! 91: /*
! 92: * unsigned int inl(unsigned int *io_port)
! 93: *
! 94: * Input an int from an IO port.
! 95: */
! 96: ENTRY(inl)
! 97: movl S_ARG0,%edx /* IO port address */
! 98: inl %dx,%eax /* get the int */
! 99: ret
! 100: ENTRY(dr6)
! 101: movl %db6, %eax
! 102: ret
! 103: /* dr<i>(address, type, len, persistence)
! 104: * type:
! 105: * 00 execution (use len 00)
! 106: * 01 data write
! 107: * 11 data read/write
! 108: * len:
! 109: * 00 one byte
! 110: * 01 two bytes
! 111: * 11 four bytes
! 112: */
! 113: ENTRY(dr0)
! 114: movl S_ARG0, %eax
! 115: movl %eax,_C_LABEL(dr_addr)
! 116: movl %eax, %db0
! 117: movl $0, %ecx
! 118: jmp 0f
! 119: ENTRY(dr1)
! 120: movl S_ARG0, %eax
! 121: movl %eax,_C_LABEL(dr_addr)+1*4
! 122: movl %eax, %db1
! 123: movl $2, %ecx
! 124: jmp 0f
! 125: ENTRY(dr2)
! 126: movl S_ARG0, %eax
! 127: movl %eax,_C_LABEL(dr_addr)+2*4
! 128: movl %eax, %db2
! 129: movl $4, %ecx
! 130: jmp 0f
! 131: ENTRY(dr3)
! 132: movl S_ARG0, %eax
! 133: movl %eax,_C_LABEL(dr_addr)+3*4
! 134: movl %eax, %db3
! 135: movl $6, %ecx
! 136: 0:
! 137: pushl %ebp
! 138: movl %esp, %ebp
! 139: movl %db7, %edx
! 140: movl %edx,_C_LABEL(dr_addr)+4*4
! 141: andl dr_msk(,%ecx,2),%edx /* clear out new entry */
! 142: movl %edx,_C_LABEL(dr_addr)+5*4
! 143: movzbl B_ARG3, %eax
! 144: andb $3, %al
! 145: shll %cl, %eax
! 146: orl %eax, %edx
! 147: movzbl B_ARG1, %eax
! 148: andb $3, %al
! 149: add $0x10, %ecx
! 150: shll %cl, %eax
! 151: orl %eax, %edx
! 152: movzbl B_ARG2, %eax
! 153: andb $3, %al
! 154: add $0x2, %ecx
! 155: shll %cl, %eax
! 156: orl %eax, %edx
! 157: movl %edx, %db7
! 158: movl %edx,_C_LABEL(dr_addr)+7*4
! 159: movl %edx, %eax
! 160: leave
! 161: ret
! 162: .data
! 163: dr_msk:
! 164: .long ~0x000f0003
! 165: .long ~0x00f0000c
! 166: .long ~0x0f000030
! 167: .long ~0xf00000c0
! 168: ENTRY(dr_addr)
! 169: .long 0,0,0,0
! 170: .long 0,0,0,0
! 171: .text
! 172:
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