diff options
Diffstat (limited to 'src/cmd/6g/reg.go')
| -rw-r--r-- | src/cmd/6g/reg.go | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/src/cmd/6g/reg.go b/src/cmd/6g/reg.go new file mode 100644 index 0000000000..0629a6248d --- /dev/null +++ b/src/cmd/6g/reg.go @@ -0,0 +1,144 @@ +// 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. + +package main + +import ( + "cmd/internal/obj" + "cmd/internal/obj/x86" +) +import "cmd/internal/gc" + +const ( + NREGVAR = 32 +) + +var regname = []string{ + ".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", +} + +func regnames(n *int) []string { + *n = NREGVAR + return regname +} + +func excludedregs() uint64 { + return RtoB(x86.REG_SP) +} + +func doregbits(r int) uint64 { + var b uint64 + + b = 0 + if r >= x86.REG_AX && r <= x86.REG_R15 { + b |= RtoB(r) + } else if r >= x86.REG_AL && r <= x86.REG_R15B { + b |= RtoB(r - x86.REG_AL + x86.REG_AX) + } else if r >= x86.REG_AH && r <= x86.REG_BH { + b |= RtoB(r - x86.REG_AH + x86.REG_AX) + } else if r >= x86.REG_X0 && r <= x86.REG_X0+15 { + b |= FtoB(r) + } + return b +} + +func RtoB(r int) uint64 { + if r < x86.REG_AX || r > x86.REG_R15 { + return 0 + } + return 1 << uint(r-x86.REG_AX) +} + +func BtoR(b uint64) int { + b &= 0xffff + if gc.Nacl { + b &^= (1<<(x86.REG_BP-x86.REG_AX) | 1<<(x86.REG_R15-x86.REG_AX)) + } else if obj.Framepointer_enabled != 0 { + // BP is part of the calling convention if framepointer_enabled. + b &^= (1 << (x86.REG_BP - x86.REG_AX)) + } + + if b == 0 { + return 0 + } + return gc.Bitno(b) + x86.REG_AX +} + +/* + * bit reg + * 16 X0 + * ... + * 31 X15 + */ +func FtoB(f int) uint64 { + if f < x86.REG_X0 || f > x86.REG_X15 { + return 0 + } + return 1 << uint(f-x86.REG_X0+16) +} + +func BtoF(b uint64) int { + b &= 0xFFFF0000 + if b == 0 { + return 0 + } + return gc.Bitno(b) - 16 + x86.REG_X0 +} |