88 lines
1.2 KiB
C
88 lines
1.2 KiB
C
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#include "rules.y"
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gpr: GPR
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e16
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: absexp
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{
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/* Allow signed or unsigned 16-bit values. */
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if (($1 < -0x8000) || ($1 > 0xffff))
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serror("16-bit signed value out of range");
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$$ = (uint16_t) $1;
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}
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;
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e9
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: absexp
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{
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/* Allow signed or unsigned 9-bit values. */
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if (($1 < -0x100) || ($1 > 0x1ff))
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serror("9-bit signed value out of range");
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$$ = (uint16_t) $1;
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}
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;
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u20
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: absexp
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{
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if (($1 < 0) || ($1 > 0xfffff))
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serror("20-bit unsigned value out of range");
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$$ = $1;
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}
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;
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u5
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: absexp
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{
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if (($1 < 0) || ($1 > 0x1f))
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serror("5-bit unsigned value out of range");
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$$ = $1;
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}
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;
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offset16
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: expr
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{
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int dist = $1.val - DOTVAL;
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fit(fitx(dist, 18));
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if (dist & 0x3)
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serror("jump targets must be 4-aligned");
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newrelo($1.typ, RELOMIPS | RELPC | FIXUPFLAGS);
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$$ = (dist >> 2) & 0x0000ffff;
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}
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;
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abs26
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: expr
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{
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int target = $1.val;
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fit(fitx(target, 28));
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if (target & 0x3)
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serror("jump targets must be 4-aligned");
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newrelo($1.typ, RELOMIPS | FIXUPFLAGS);
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$$ = (target >> 2) & 0x03fffffd;
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}
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;
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extmsblsb
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: u5 ',' u5
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{
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int pos = $1;
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int size = $3;
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$$ = ((size-1) << 5) | pos;
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}
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;
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insmsblsb
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: u5 ',' u5
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{
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int pos = $1;
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int size = $3;
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$$ = ((pos+size-1) << 5) | pos;
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}
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;
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