Annotation of sys/arch/arm/arm/copystr.S, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: copystr.S,v 1.2 2006/11/15 19:48:29 miod Exp $ */
! 2: /* $NetBSD: copystr.S,v 1.8 2002/10/13 14:54:48 bjh21 Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1995 Mark Brinicombe.
! 6: * All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. All advertising materials mentioning features or use of this software
! 17: * must display the following acknowledgement:
! 18: * This product includes software developed by Mark Brinicombe.
! 19: * 4. The name of the company nor the name of the author may be used to
! 20: * endorse or promote products derived from this software without specific
! 21: * prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
! 24: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
! 25: * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 26: * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
! 27: * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
! 28: * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
! 29: * 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: * copystr.S
! 36: *
! 37: * optimised and fault protected copystr functions
! 38: *
! 39: * Created : 16/05/95
! 40: */
! 41:
! 42: #include "assym.h"
! 43: #include <machine/asm.h>
! 44: #include <sys/errno.h>
! 45:
! 46: .text
! 47: .align 0
! 48: #ifdef MULTIPROCESSOR
! 49: .Lcpu_info:
! 50: .word _C_LABEL(cpu_info)
! 51: #else
! 52: .Lcurpcb:
! 53: .word _C_LABEL(curpcb)
! 54: #endif
! 55:
! 56: /*
! 57: * r0 - from
! 58: * r1 - to
! 59: * r2 - maxlens
! 60: * r3 - lencopied
! 61: *
! 62: * Copy string from r0 to r1
! 63: */
! 64: ENTRY(copystr)
! 65: stmfd sp!, {r4-r5} /* stack is 8 byte aligned */
! 66: teq r2, #0x00000000
! 67: mov r5, #0x00000000
! 68: moveq r0, #ENAMETOOLONG
! 69: beq 2f
! 70:
! 71: 1: ldrb r4, [r0], #0x0001
! 72: add r5, r5, #0x00000001
! 73: teq r4, #0x00000000
! 74: strb r4, [r1], #0x0001
! 75: teqne r5, r2
! 76: bne 1b
! 77:
! 78: teq r4, #0x00000000
! 79: moveq r0, #0x00000000
! 80: movne r0, #ENAMETOOLONG
! 81:
! 82: 2: teq r3, #0x00000000
! 83: strne r5, [r3]
! 84:
! 85: ldmfd sp!, {r4-r5} /* stack is 8 byte aligned */
! 86: mov pc, lr
! 87:
! 88: #ifdef __PROG32
! 89: #define SAVE_REGS stmfd sp!, {r4-r6}
! 90: #define RESTORE_REGS ldmfd sp!, {r4-r6}
! 91: #else
! 92: /* Need to save R14_svc because it'll get trampled if we take a page fault. */
! 93: #define SAVE_REGS stmfd sp!, {r4-r6, r14}
! 94: #define RESTORE_REGS ldmfd sp!, {r4-r6, r14}
! 95: #endif
! 96:
! 97: /*
! 98: * r0 - user space address
! 99: * r1 - kernel space address
! 100: * r2 - maxlens
! 101: * r3 - lencopied
! 102: *
! 103: * Copy string from user space to kernel space
! 104: */
! 105: ENTRY(copyinstr)
! 106: SAVE_REGS
! 107:
! 108: teq r2, #0x00000000
! 109: mov r6, #0x00000000
! 110: moveq r0, #ENAMETOOLONG
! 111: beq 2f
! 112:
! 113: #ifdef MULTIPROCESSOR
! 114: /* XXX Probably not appropriate for non-Hydra SMPs */
! 115: stmfd sp!, {r0-r3, r14}
! 116: bl _C_LABEL(cpu_number)
! 117: ldr r4, .Lcpu_info
! 118: ldr r4, [r4, r0, lsl #2]
! 119: ldr r4, [r4, #CI_CURPCB]
! 120: ldmfd sp!, {r0-r3, r14}
! 121: #else
! 122: ldr r4, .Lcurpcb
! 123: ldr r4, [r4]
! 124: #endif
! 125:
! 126: #ifdef DEBUG
! 127: teq r4, #0x00000000
! 128: beq .Lcopystrpcbfault
! 129: #endif
! 130:
! 131: adr r5, .Lcopystrfault
! 132: str r5, [r4, #PCB_ONFAULT]
! 133:
! 134: 1: ldrbt r5, [r0], #0x0001
! 135: add r6, r6, #0x00000001
! 136: teq r5, #0x00000000
! 137: strb r5, [r1], #0x0001
! 138: teqne r6, r2
! 139: bne 1b
! 140:
! 141: mov r0, #0x00000000
! 142: str r0, [r4, #PCB_ONFAULT]
! 143:
! 144: teq r5, #0x00000000
! 145: moveq r0, #0x00000000
! 146: movne r0, #ENAMETOOLONG
! 147:
! 148: 2: teq r3, #0x00000000
! 149: strne r6, [r3]
! 150:
! 151: RESTORE_REGS
! 152: mov pc, lr
! 153:
! 154: /*
! 155: * r0 - kernel space address
! 156: * r1 - user space address
! 157: * r2 - maxlens
! 158: * r3 - lencopied
! 159: *
! 160: * Copy string from kernel space to user space
! 161: */
! 162: ENTRY(copyoutstr)
! 163: SAVE_REGS
! 164:
! 165: teq r2, #0x00000000
! 166: mov r6, #0x00000000
! 167: moveq r0, #ENAMETOOLONG
! 168: beq 2f
! 169:
! 170: #ifdef MULTIPROCESSOR
! 171: /* XXX Probably not appropriate for non-Hydra SMPs */
! 172: stmfd sp!, {r0-r3, r14}
! 173: bl _C_LABEL(cpu_number)
! 174: ldr r4, .Lcpu_info
! 175: ldr r4, [r4, r0, lsl #2]
! 176: ldr r4, [r4, #CI_CURPCB]
! 177: ldmfd sp!, {r0-r3, r14}
! 178: #else
! 179: ldr r4, .Lcurpcb
! 180: ldr r4, [r4]
! 181: #endif
! 182:
! 183: #ifdef DEBUG
! 184: teq r4, #0x00000000
! 185: beq .Lcopystrpcbfault
! 186: #endif
! 187:
! 188: adr r5, .Lcopystrfault
! 189: str r5, [r4, #PCB_ONFAULT]
! 190:
! 191: 1: ldrb r5, [r0], #0x0001
! 192: add r6, r6, #0x00000001
! 193: teq r5, #0x00000000
! 194: strbt r5, [r1], #0x0001
! 195: teqne r6, r2
! 196: bne 1b
! 197:
! 198: mov r0, #0x00000000
! 199: str r0, [r4, #PCB_ONFAULT]
! 200:
! 201: teq r5, #0x00000000
! 202: moveq r0, #0x00000000
! 203: movne r0, #ENAMETOOLONG
! 204:
! 205: 2: teq r3, #0x00000000
! 206: strne r6, [r3]
! 207:
! 208: RESTORE_REGS
! 209: mov pc, lr
! 210:
! 211: /* A fault occurred during the copy */
! 212: .Lcopystrfault:
! 213: mov r1, #0x00000000
! 214: str r1, [r4, #PCB_ONFAULT]
! 215: RESTORE_REGS
! 216: mov pc, lr
! 217:
! 218: #ifdef DEBUG
! 219: .Lcopystrpcbfault:
! 220: mov r2, r1
! 221: mov r1, r0
! 222: adr r0, Lcopystrpcbfaulttext
! 223: bic sp, sp, #7 /* align stack to 8 bytes */
! 224: b _C_LABEL(panic)
! 225:
! 226: Lcopystrpcbfaulttext:
! 227: .asciz "No valid PCB during copyinoutstr() addr1=%08x addr2=%08x\n"
! 228: .align 0
! 229: #endif
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