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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [libgloss/] [mn10300/] [cygmon.c] - Rev 455
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/* cygmon.c -- Glue code for linking apps to run on top of Cygmon. * * Copyright (c) 1998, 1999, 2000, 2001 Red Hat, Inc. * * The authors hereby grant permission to use, copy, modify, distribute, * and license this software and its documentation for any purpose, provided * that existing copyright notices are retained in all copies and that this * notice is included verbatim in any distributions. No written agreement, * license, or royalty fee is required for any of the authorized uses. * Modifications to this software may be copyrighted by their authors * and need not follow the licensing terms described here, provided that * the new terms are clearly indicated on the first page of each file where * they apply. */ #include <errno.h> // These need to be kept in sync with the definitions in Cygmon. #define SYS_meminfo 1001 #include "syscall.h" /* Structure filled in by get_mem_info. Only the size field is actually used (by sbrk), so the others aren't even filled in. */ struct s_mem { unsigned int size; unsigned int icsize; unsigned int dcsize; }; // Perform a system call. // Unused parameters should be set to 0. int __trap0(unsigned long func, unsigned long p1, unsigned long p2, unsigned long p3) { int ret = 0; #ifdef __AM33__ { register unsigned long d0 asm ("d0") = func; register unsigned long d1 asm ("d1") = p1; register unsigned long d2 asm ("d2") = p2; register unsigned long d3 asm ("d3") = p3; asm volatile (" syscall 0\n" " nop" : "+d" (d0) : "d" (d1), "d" (d2), "d" (d3) : "memory"); ret = d0; } #endif if (func == SYS_exit) { while (1) { asm volatile (" .byte 0xff "); // trigger a breakpoint to drop back into Cygmon } } if (ret != 0) errno = ret; return ret; } void * get_mem_info (mem) struct s_mem *mem; { unsigned long totmem = 0, topmem = 0; register int numbanks; numbanks = __trap0(SYS_meminfo, (unsigned long)&totmem, (unsigned long)&topmem, 0); mem->size = totmem; return (void*)topmem; }
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