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79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
#include "unwind_i.h"
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/* Apply rotation to a general register. REG must be in the range 0-127. */
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static inline int
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rotate_gr (struct cursor *c, int reg)
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{
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unsigned int rrb_gr, sor;
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int preg;
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sor = 8 * ((c->cfm >> 14) & 0xf);
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rrb_gr = (c->cfm >> 18) & 0x7f;
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if ((unsigned) (reg - 32) >= sor)
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preg = reg;
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else
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{
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preg = reg + rrb_gr; /* apply rotation */
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if ((unsigned) (preg - 32) >= sor)
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preg -= sor; /* wrap around */
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}
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if (sor)
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debug (100, "%s: sor=%u rrb.gr=%u, r%d -> r%d\n",
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__FUNCTION__, sor, rrb_gr, reg, preg);
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return preg;
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}
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/* Apply rotation to a floating-point register. The number REG must
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be in the range of 0-127. */
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static inline int
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rotate_fr (struct cursor *c, int reg)
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{
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unsigned int rrb_fr;
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int preg;
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rrb_fr = (c->cfm >> 25) & 0x7f;
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if (reg < 32)
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preg = reg; /* register not part of the rotating partition */
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else
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{
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preg = reg + rrb_fr; /* apply rotation */
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if (preg > 127)
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preg -= 96; /* wrap around */
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}
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if (rrb_fr)
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debug (100, "%s: rrb.fr=%u, f%d -> f%d\n",
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__FUNCTION__, rrb_fr, reg, preg);
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return preg;
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}
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/* Apply logical-to-physical rotation. */
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static inline unw_word_t
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pr_ltop (struct cursor *c, unw_word_t pr)
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{
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unw_word_t rrb_pr, mask, rot;
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rrb_pr = (c->cfm >> 32) & 0x3f;
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rot = pr >> 16;
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mask = ((unw_word_t) 1 << rrb_pr) - 1;
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rot = ((pr & mask) << (48 - rrb_pr)) | ((pr >> rrb_pr) & mask);
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return (pr & 0xffff) | (rot << 16);
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}
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/* Apply physical-to-logical rotation. */
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static inline unw_word_t
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pr_ptol (struct cursor *c, unw_word_t pr)
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{
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unw_word_t rrb_pr, mask, rot;
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rrb_pr = 48 - ((c->cfm >> 32) & 0x3f);
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rot = pr >> 16;
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mask = ((unw_word_t) 1 << rrb_pr) - 1;
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rot = ((pr & mask) << (48 - rrb_pr)) | ((pr >> rrb_pr) & mask);
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return (pr & 0xffff) | (rot << 16);
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}
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