| // Derived from Inferno utils/6c/reg.c |
| // http://code.google.com/p/inferno-os/source/browse/utils/6c/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[] = { |
| ".AX", |
| ".CX", |
| ".DX", |
| ".BX", |
| ".SP", |
| ".BP", |
| ".SI", |
| ".DI", |
| ".R8", |
| ".R9", |
| ".R10", |
| ".R11", |
| ".R12", |
| ".R13", |
| ".R14", |
| ".R15", |
| ".X0", |
| ".X1", |
| ".X2", |
| ".X3", |
| ".X4", |
| ".X5", |
| ".X6", |
| ".X7", |
| ".X8", |
| ".X9", |
| ".X10", |
| ".X11", |
| ".X12", |
| ".X13", |
| ".X14", |
| ".X15", |
| }; |
| |
| char** |
| regnames(int *n) |
| { |
| *n = NREGVAR; |
| return regname; |
| } |
| |
| uint64 |
| excludedregs(void) |
| { |
| return RtoB(REG_SP); |
| } |
| |
| uint64 |
| doregbits(int r) |
| { |
| uint64 b; |
| |
| b = 0; |
| if(r >= REG_AX && r <= REG_R15) |
| b |= RtoB(r); |
| else |
| if(r >= REG_AL && r <= REG_R15B) |
| b |= RtoB(r-REG_AL+REG_AX); |
| else |
| if(r >= REG_AH && r <= REG_BH) |
| b |= RtoB(r-REG_AH+REG_AX); |
| else |
| if(r >= REG_X0 && r <= REG_X0+15) |
| b |= FtoB(r); |
| return b; |
| } |
| |
| uint64 |
| RtoB(int r) |
| { |
| |
| if(r < REG_AX || r > REG_R15) |
| return 0; |
| return 1ULL << (r-REG_AX); |
| } |
| |
| int |
| BtoR(uint64 b) |
| { |
| b &= 0xffffULL; |
| if(nacl) |
| b &= ~((1<<(REG_BP-REG_AX)) | (1<<(REG_R15-REG_AX))); |
| else if(framepointer_enabled) |
| // BP is part of the calling convention if framepointer_enabled. |
| b &= ~(1<<(REG_BP-REG_AX)); |
| if(b == 0) |
| return 0; |
| return bitno(b) + REG_AX; |
| } |
| |
| /* |
| * bit reg |
| * 16 X0 |
| * ... |
| * 31 X15 |
| */ |
| uint64 |
| FtoB(int f) |
| { |
| if(f < REG_X0 || f > REG_X15) |
| return 0; |
| return 1ULL << (f - REG_X0 + 16); |
| } |
| |
| int |
| BtoF(uint64 b) |
| { |
| |
| b &= 0xFFFF0000L; |
| if(b == 0) |
| return 0; |
| return bitno(b) - 16 + REG_X0; |
| } |
