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/*
* Standalone Hello World program - tests for presence of the FP
* support code and also shows how to interface to the
* standalone C kernel's error handler.
*
* Copyright (C) 1993 Advanced RISC Machines Limited.
*/
#include "rtstand.h"
extern void __swi(0) put_char(int ch);
extern void __swi(2) put_string(char *string);
/* First let's roll our own, primitive hex number printer.
* Strictly %#.8X format.
*/
static void puth(unsigned n) {
int j;
put_string("0X");
for (j = 0; j < 8; ++j) {
put_char("0123456789ABCDEF"[n >> 28]);
n <<= 4;
}
}
static jmp_buf err_label;
/* This is the function weakly-referenced from the standalone C kernel.
* If it exists, it will be called when a run-time error occurs.
* If the error is a 'pseudo-error', raised because the error-handler
* has been called directly, then the user's register set *r will contain
* random values for a1-a4 and ip (r[0-3], r[12]) and r[15] will be
* identical to r[14].
*/
void __err_handler(__rt_error *e, __rt_registers *r) {
put_string("errhandler called: code = ");
puth(e->errnum);
put_string(": "); put_string(e->errmess); put_string("\r\n");
put_string("caller's pc = "); puth(r->r[15]);
put_string("\r\nreturning...\r\n");
#ifdef LONGJMP
longjmp(err_label, e->errnum);
#endif
}
#ifdef DIVIDE_ERROR
#define LIMIT 0
#else
#define LIMIT 1
#endif
int main(int argc, char *argv[]) {
int rc;
put_string("(the floating point instruction-set is ");
if (!__rt_fpavailable()) put_string("not ");
put_string("available)\r\n");
/* Set up the jmp_buffer, and if returning due to longjmp then
* goto errlabel
*/
if ((rc = setjmp(err_label)) != 0) goto errlabel;
if (__rt_fpavailable()) {
float a;
put_string("Using Floating point, but casting to int ...\r\n");
for (a=(float) 10.0;a>=(float) LIMIT;a-=(float) 1.0) {
put_string("10000 / "); puth((int) a); put_string(" = ");
puth((int) (10000.0/a)); put_string("\r\n");
}
} else {
int a;
put_string("Using integer arithmetic ...\r\n");
for (a=10;a>=LIMIT;a--) {
put_string("10000 / "); puth(a); put_string(" = ");
puth(10000/a); put_string("\r\n");
}
}
return 0;
errlabel:
put_string("\nReturning from __err_handler() with errnum = ");
puth(rc);
put_string("\r\n\n");
return 0;
}
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