187 lines
3.2 KiB
Ruby
187 lines
3.2 KiB
Ruby
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$bytes = []
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def zero_fill(pos)
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while ($bytes.length <= pos) do
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$bytes.push(0)
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end
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end
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def word(i)
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$bytes.push((i & 0x000000ff),
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(i & 0x0000ff00) >> 8,
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(i & 0x00ff0000) >> 16,
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(i & 0xff000000) >> 24)
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end
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def string(s)
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$bytes.push *s.bytes
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while (($bytes.length % 4) != 0) do
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$bytes.push 0
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end
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end
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# # # INSTRUCTIONS # # #
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# ops should always be in format of
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# [src] [args] -> [dest]
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def jmp(addr)
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# TODO: this probs wont show up since we have < 3mb of ram but
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# we can't jump to an address with a different 4 most significant bits
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raise "jmp addr must be 4 byte aligned" if addr % 4 != 0
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op = 0b0000_1000_0000_0000_0000_0000_0000_0000
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op = op | ((addr >> 2) & 0b11_11111111_11111111_11111111)
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word op
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end
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def jal(addr)
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# TODO: same problem as jmp
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raise "jmp addr must be 4 byte aligned" if addr % 4 != 0
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op = 0b0000_1100_0000_0000_0000_0000_0000_0000
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op = op | ((addr >> 2) & 0b11_11111111_11111111_11111111)
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word op
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end
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# load upper immediate
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# NOTE: val will be shifted left by 16
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def lui(val, dest)
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# oooooo ----- ddddd iiiiiiiiiiiiiiii
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op = 0b001111_00000_00000_0000000000000000
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op |= 0xffff & val
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op |= (0b11111 & dest) << 16
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word op
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end
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# shift right logical
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def srl(src, amt, dest)
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# oooooo ----- sssss ddddd hhhhh oooooo
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op = 0b000000_00000_00000_00000_00000_000010
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op |= (src & 0b11111) << 16
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op |= (amt & 0b11111) << 6
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op |= (dest & 0b11111) << 11
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word op
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end
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# or immediate
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def ori(src, bits, dest)
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# oooooo sssss ddddd iiiiiiii iiiiiiii
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op = 0b001101_00000_00000_00000000_00000000
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op |= (src & 0b11111) << 21
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op |= (bits & 0xffff)
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op |= (dest & 0b11111) << 16
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word op
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end
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# store word
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def sw(src, offset, dest)
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# oooooo ddddd sssss iiiiiiii iiiiiiii
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op = 0b101011_00000_00000_00000000_00000000
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op |= (src & 0b11111) << 16
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op |= (offset & 0xffff)
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op |= (dest & 0b11111) << 21
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word op
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end
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# # # PSEUDO-INSTRUCTIONS # # #
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def nop
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word 0x00000000
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end
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# this is a terrible idea and im doing it
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#$labels = {}
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#def method_missing(m, *args)
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# puts m.to_s
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# super
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#end
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# # # CONSTANTS # # #
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$base_addr = 0x80010000 # 0x10000 # 0x80010000
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$file_size = 0x800
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$gp0 = 0x1F801810
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# # # EXE HEADER # # #
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string "PS-X EXE"
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zero_fill 0x00f
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word $base_addr # initial pc
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word 0x00000000 # initial GP/R28
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word $base_addr # destintation address in RAM
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word $file_size # file size excluding header (must be N * 0x800)
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word 0x00000000 # Unknown/Unused
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word 0x00000000 # Unknown/Unused
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word 0x00000000 # Memfill start address
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word 0x00000000 # Memfill size in bytes
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word 0x801ffff0 # Initial SP/R29 & FP/R30 Base
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word 0x00000000 # Initial SP/R29 & FP/R30 Offs
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zero_fill 0x4b # Reserved for A(43h) Function
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# Ascii marker would go here
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zero_fill 0x7ff
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$exe_header = $bytes[0..]
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$bytes = []
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# # # PROGRAM CODE # # #
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nop ; jmp $base_addr + 16 ; nop ; word 0xdeadbeef
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# ops should always be in format of
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# src [args] -> dest
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lui $gp0 >> 16, 1
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ori 1, $gp0, 1
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nop
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#lui 0, 3
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#ori 3, 0xffff, 3
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#sw 1, 0, 2
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32.times do |i|
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ori i, 0xf00d, i
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end
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nop ; nop ; nop ; nop
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nop ; nop ; nop ; nop
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nop ; nop ; nop ; nop
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nop ; nop ; nop ; nop
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jmp $base_addr
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nop
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string "this is a test lol"
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zero_fill $file_size - 1
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f = File.new "LOADTHIS.EXE", "wb"
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f.write $exe_header.pack("C*")
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f.write $bytes.pack("C*")
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f.close
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