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