mirror of https://github.com/dzavalishin/oskit/
65 lines
1.8 KiB
ArmAsm
Executable File
65 lines
1.8 KiB
ArmAsm
Executable File
/*
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* Copyright (c) 1994-1996 Sleepless Software
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* Copyright (c) 1997-1999 University of Utah and the Flux Group.
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* All rights reserved.
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*
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* This file is part of the Flux OSKit. The OSKit is free software, also known
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* as "open source;" you can redistribute it and/or modify it under the terms
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* of the GNU General Public License (GPL), version 2, as published by the Free
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* Software Foundation (FSF). To explore alternate licensing terms, contact
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* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
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*
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* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
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* received a copy of the GPL along with the OSKit; see the file COPYING. If
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* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
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*/
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/*
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* Remote PC serial-line debugging for the Flux OS Toolkit
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*/
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#include <oskit/arm32/asm.h>
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.text
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/*
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* Copy between kernel address space and a GDB buffer,
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* detecting and recovering from any invalid accesses that occur.
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* Since we are merely copying in the same address space (the kernel),
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* both the gdb_copyin and gdb_copyout routines can be the same.
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*
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* arg0: source address
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* arg1: destination address
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* arg2: byte count
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*/
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ENTRY(gdb_copy)
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ldr r3, Lgdb_trap_recover
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ldr ip, copy_fail
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str ip, [r3]
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sub r2, r2, #1
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cmn r2, #1
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moveq pc, lr
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Loop:
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sub r2, r2, #1
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ldrb r3, [r0], #1
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cmn r2, #1
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strb r3, [r1], #1
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bne Loop
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mov r0, #0 /* return 0 for success */
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copy_ret:
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ldr r3, Lgdb_trap_recover
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mov ip, #0
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str ip, [r3]
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mov pc, lr
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copy_fail:
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mov r0, #-1 /* return -1 for failure */
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b copy_ret /* pop frame and return */
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Lgdb_trap_recover:
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.word gdb_trap_recover
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