mirror of
https://github.com/ioacademy-jikim/debugging
synced 2025-06-11 09:56:29 +00:00
62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
#include <assert.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "opcodes.h"
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#define srnmt(b,d) \
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({ \
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__asm__ volatile ( "lghi 8," #b "\n\t" \
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SRNMT(8,d) \
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::: "8"); \
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})
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/* Like srnmt above, except it uses r0 as a base register */
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#define srnmt0(d) \
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({ \
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__asm__ volatile ( SRNMT(0,d) \
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::: "0"); \
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})
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unsigned
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get_dfp_rounding_mode(void)
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{
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unsigned fpc;
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__asm__ volatile ("stfpc %0\n\t" : "=m"(fpc));
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return (fpc & 0x70) >> 4;
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}
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int main(void)
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{
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printf("initial rounding mode = %u\n", get_dfp_rounding_mode());
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/* Set basic rounding modes in various ways */
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srnmt(1,002); // 1 + 2 = 3
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printf("rounding mode = %u\n", get_dfp_rounding_mode());
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srnmt(2,000);
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printf("rounding mode = %u\n", get_dfp_rounding_mode());
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srnmt(0,001);
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printf("rounding mode = %u\n", get_dfp_rounding_mode());
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srnmt(0,000);
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printf("rounding mode = %u\n", get_dfp_rounding_mode());
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srnmt(7,000);
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printf("rounding mode = %u\n", get_dfp_rounding_mode());
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srnmt(0,006);
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printf("rounding mode = %u\n", get_dfp_rounding_mode());
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srnmt0(005);
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printf("rounding mode = %u\n", get_dfp_rounding_mode());
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srnmt0(004);
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printf("rounding mode = %u\n", get_dfp_rounding_mode());
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return 0;
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}
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