58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
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/*
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* bdm semihosting support.
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*
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* Copyright (c) 2006 CodeSourcery Inc
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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/* Semihosting uses a user trap handler containing a HALT
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instruction. This wakes the debugger to perform some action. */
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/* This is the semihosting trap hander */
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#define BDM_TRAPNUM 15
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/* This register holds the function enumeration for a semihosting
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command. */
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#define BDM_FUNC_REG "d0"
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/* This register holds the argument for the semihosting call. For most
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functions, this is a pointer to a block of memory that holds the input
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and output parameters for the remote file i/o operation. */
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#define BDM_ARG_REG "d1"
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/* Codes for BDM_FUNC_REG. */
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#define BDM_EXIT 0
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#define BDM_PUTCHAR 1 /* Obsolete */
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#define BDM_OPEN 2
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#define BDM_CLOSE 3
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#define BDM_READ 4
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#define BDM_WRITE 5
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#define BDM_LSEEK 6
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#define BDM_RENAME 7
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#define BDM_UNLINK 8
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#define BDM_STAT 9
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#define BDM_FSTAT 10
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#define BDM_GETTIMEOFDAY 11
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#define BDM_ISATTY 12
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#define BDM_SYSTEM 13
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/* Here is the macro that generates the trap. */
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#define BDM_TRAP(func, arg) \
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__asm__ __volatile__ ("move.l %0,%/" BDM_ARG_REG "\n" \
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"moveq %1,%/" BDM_FUNC_REG "\n" \
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"trap %2" \
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:: "rmi" (arg), "n" (func), "n" (BDM_TRAPNUM) \
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: BDM_FUNC_REG,BDM_ARG_REG,"memory")
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