| // Inferno utils/5c/reg.c |
| // http://code.google.com/p/inferno-os/source/browse/utils/5c/reg.c |
| // |
| // Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved. |
| // Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net) |
| // Portions Copyright © 1997-1999 Vita Nuova Limited |
| // Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com) |
| // Portions Copyright © 2004,2006 Bruce Ellis |
| // Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net) |
| // Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others |
| // Portions Copyright © 2009 The Go Authors. All rights reserved. |
| // |
| // 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 <u.h> |
| #include <libc.h> |
| #include "gg.h" |
| #include "../gc/popt.h" |
| |
| enum { |
| NREGVAR = 32, |
| }; |
| |
| static char* regname[] = { |
| ".R0", |
| ".R1", |
| ".R2", |
| ".R3", |
| ".R4", |
| ".R5", |
| ".R6", |
| ".R7", |
| ".R8", |
| ".R9", |
| ".R10", |
| ".R11", |
| ".R12", |
| ".R13", |
| ".R14", |
| ".R15", |
| ".F0", |
| ".F1", |
| ".F2", |
| ".F3", |
| ".F4", |
| ".F5", |
| ".F6", |
| ".F7", |
| ".F8", |
| ".F9", |
| ".F10", |
| ".F11", |
| ".F12", |
| ".F13", |
| ".F14", |
| ".F15", |
| }; |
| |
| char** |
| regnames(int *n) |
| { |
| *n = NREGVAR; |
| return regname; |
| } |
| |
| uint64 |
| excludedregs(void) |
| { |
| return RtoB(REGSP)|RtoB(REGLINK)|RtoB(REGPC); |
| } |
| |
| uint64 |
| doregbits(int r) |
| { |
| USED(r); |
| return 0; |
| } |
| |
| /* |
| * bit reg |
| * 0 R0 |
| * 1 R1 |
| * ... ... |
| * 10 R10 |
| * 12 R12 |
| * |
| * bit reg |
| * 18 F2 |
| * 19 F3 |
| * ... ... |
| * 31 F15 |
| */ |
| uint64 |
| RtoB(int r) |
| { |
| if(REG_R0 <= r && r <= REG_R15) { |
| if(r >= REGTMP-2 && r != REG_R12) // excluded R9 and R10 for m and g, but not R12 |
| return 0; |
| return 1ULL << (r - REG_R0); |
| } |
| |
| if(REG_F0 <= r && r <= REG_F15) { |
| if(r < REG_F2 || r > REG_F0+NFREG-1) |
| return 0; |
| return 1ULL << ((r - REG_F0) + 16); |
| } |
| |
| return 0; |
| } |
| |
| int |
| BtoR(uint64 b) |
| { |
| // TODO Allow R0 and R1, but be careful with a 0 return |
| // TODO Allow R9. Only R10 is reserved now (just g, not m). |
| b &= 0x11fcL; // excluded R9 and R10 for m and g, but not R12 |
| if(b == 0) |
| return 0; |
| return bitno(b) + REG_R0; |
| } |
| |
| int |
| BtoF(uint64 b) |
| { |
| b &= 0xfffc0000L; |
| if(b == 0) |
| return 0; |
| return bitno(b) - 16 + REG_F0; |
| } |
