| /* libunwind - a platform-independent unwind library |
| Copyright (C) 2002-2005 Hewlett-Packard Co |
| Contributed by David Mosberger-Tang <davidm@hpl.hp.com> |
| |
| This file is part of libunwind. |
| |
| Permission is hereby granted, free of charge, to any person obtaining |
| a copy of this software and associated documentation files (the |
| "Software"), to deal in the Software without restriction, including |
| without limitation the rights to use, copy, modify, merge, publish, |
| distribute, sublicense, and/or sell copies of the Software, and to |
| permit persons to whom the Software is furnished to do so, subject to |
| the following conditions: |
| |
| The above copyright notice and this permission notice shall be |
| included in all copies or substantial portions of the Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
| LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ |
| |
| #include "unwind_i.h" |
| |
| /* Apply rotation to a general register. REG must be in the range 0-127. */ |
| |
| static inline int |
| rotate_gr (struct cursor *c, int reg) |
| { |
| unsigned int rrb_gr, sor; |
| int preg; |
| |
| sor = 8 * ((c->cfm >> 14) & 0xf); |
| rrb_gr = (c->cfm >> 18) & 0x7f; |
| |
| if ((unsigned) (reg - 32) >= sor) |
| preg = reg; |
| else |
| { |
| preg = reg + rrb_gr; /* apply rotation */ |
| if ((unsigned) (preg - 32) >= sor) |
| preg -= sor; /* wrap around */ |
| } |
| if (sor) |
| Debug (15, "sor=%u rrb.gr=%u, r%d -> r%d\n", sor, rrb_gr, reg, preg); |
| return preg; |
| } |
| |
| /* Apply rotation to a floating-point register. The number REG must |
| be in the range of 0-127. */ |
| |
| static inline int |
| rotate_fr (struct cursor *c, int reg) |
| { |
| unsigned int rrb_fr; |
| int preg; |
| |
| rrb_fr = (c->cfm >> 25) & 0x7f; |
| if (reg < 32) |
| preg = reg; /* register not part of the rotating partition */ |
| else |
| { |
| preg = reg + rrb_fr; /* apply rotation */ |
| if (preg > 127) |
| preg -= 96; /* wrap around */ |
| } |
| if (rrb_fr) |
| Debug (15, "rrb.fr=%u, f%d -> f%d\n", rrb_fr, reg, preg); |
| return preg; |
| } |