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Diffstat (limited to 'libgloss/xstormy16/eva_app.c')
-rw-r--r-- | libgloss/xstormy16/eva_app.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/libgloss/xstormy16/eva_app.c b/libgloss/xstormy16/eva_app.c new file mode 100644 index 000000000..f6069fc7c --- /dev/null +++ b/libgloss/xstormy16/eva_app.c @@ -0,0 +1,78 @@ +/* eva_app.c -- Glue code for linking apps to run under GDB debugger control. + * + * Copyright (c) 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 "glue.h" + +typedef void (*write_proc_t)(char *buf, int nbytes); +typedef int (*read_proc_t)(char *buf, int nbytes); + +/* There is no "syscall", so we just call directly into the stub code + at fixed addresses. */ +#define STUB_WRITE(p,n) ((write_proc_t)0x8084)((p),(n)) +#define STUB_READ(p,n) ((read_proc_t)0x8088)((p),(n)) + +/* + * print -- do a raw print of a string + */ +void +print(char *ptr) +{ + STUB_WRITE(ptr, strlen(ptr)); +} + +/* + * write -- write bytes to the serial port. Ignore fd, since + * stdout and stderr are the same. Since we have no filesystem, + * open will only return an error. + */ +int +_write (int fd, char *buf, int nbytes) +{ + STUB_WRITE(buf, nbytes); + return (nbytes); +} + +int +_read (int fd, char *buf, int nbytes) +{ + return STUB_READ(buf, nbytes); +} + +extern char _end[]; +#define HEAP_LIMIT ((char *)0xffff) + +void * +_sbrk(int inc) +{ + static char *heap_ptr = _end; + void *base; + + if (inc > (HEAP_LIMIT - heap_ptr)) + return (void *)-1; + + base = heap_ptr; + heap_ptr += inc; + + return base; +} + +void +_exit(int n) +{ + while (1) + { + asm volatile ("nop"); + asm volatile (".hword 0x0006"); /* breakpoint (special illegal insn) */ + } +} |