76 lines
1.7 KiB
Ruby
76 lines
1.7 KiB
Ruby
#!/usr/bin/env ruby
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module Rex
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module Arch
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#
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# Everything here is mostly stolen from vlad's perl sparc stuff
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#
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module Sparc
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#
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# Register number constants
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#
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RegisterNumber =
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{
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'g0' => 0, 'g1' => 1, 'g2' => 2, 'g3' => 3,
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'g4' => 4, 'g5' => 5, 'g6' => 6, 'g7' => 7,
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'o0' => 8, 'o1' => 9, 'o2' => 10, 'o3' => 11,
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'o4' => 12, 'o5' => 13, 'o6' => 14, 'o7' => 15,
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'l0' => 16, 'l1' => 17, 'l2' => 18, 'l3' => 19,
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'l4' => 20, 'l5' => 21, 'l6' => 22, 'l7' => 23,
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'i0' => 24, 'i1' => 25, 'i2' => 26, 'i3' => 27,
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'i4' => 28, 'i5' => 29, 'i6' => 30, 'i7' => 31,
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'sp' => 14, 'fp' => 30,
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} # :nodoc:
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#
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# Encodes a SETHI instruction with the value 'constant' being put into 'dst' register
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#
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def self.sethi(constant, dst)
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[
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(RegisterNumber[dst] << 25) |
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(4 << 22) |
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(constant >> 10)
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].pack('N')
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end
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#
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# Encodes an OR instruction with the value 'constant' being OR'ed with the 'src' register into the 'dst' register
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#
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def self.ori(src, constant, dst)
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[
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(2 << 30) |
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(RegisterNumber[dst] << 25) |
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(2 << 19) |
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(RegisterNumber[src] << 14) |
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(1 << 13) |
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(constant & 0x1fff)
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].pack('N')
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end
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#
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# Puts 'constant' into the 'dst' register using as few instructions as possible by checking the size of the value.
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# XXX: signedness support
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#
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def self.set(constant, dst)
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if (constant <= 4095 and constant >= 0)
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ori('g0', constant, dst)
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elsif (constant & 0x3ff)
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set_dword(constant, dst)
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else
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sethi(constant, dst)
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end
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end
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#
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# Puts 'constant' into the 'dst' register using both sethi and ori (necessary to use both uncessarily in some cases with encoders)
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#
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def self.set_dword(constant, dst)
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sethi(constant, dst) + ori(dst, constant & 0x3ff, dst)
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end
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end
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end end
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