re-worked assemlber to load from file and have real labels
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943f45dcc3
commit
2810109764
222
assembler.rb
222
assembler.rb
@ -1,27 +1,5 @@
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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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$bytes.push *s.bytes
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$bytes.push 0 # null terminate
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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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# assembler.rb
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# # # REGISTER NAMES # # #
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def r0() 0 end # zero
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@ -57,6 +35,71 @@ def sp() 29 end # stack pointer
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def fp() 30 end # frame pointer
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def ra() 31 end # return address
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class Assembler
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def initialize(base, size)
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@base_addr = base
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@file_size = size
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end
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def inspect
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"(Assembler base_addr:0x#{@base_addr.to_s 16} file_size:0x#{@file_size.to_s 16})"
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end
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# TODO: Sub-labels
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def label(l)
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return if @first_pass == false
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raise "error redefinition of label #{l.to_s}" if @labels.member?(l.to_s)
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@labels[l.to_s] = @bytes.length + @base_addr
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end
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def method_missing(m, *args, &block)
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return 0 if @first_pass
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if m.to_s[0, 2] == "l_" then
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return @labels[m.to_s[2..]] if @labels.member?(m.to_s[2..])
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raise "label doesn't exist #{m.to_s}"
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else
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super
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end
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end
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def assemble(source)
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@first_pass = true
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@labels = {}
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@bytes = []
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binding.eval source
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@first_pass = false
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@bytes = []
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binding.eval source
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puts "assembled 0x#{@bytes.length.to_s 16} (#{@bytes.length}) bytes"
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raise "CODE IS GREATER THAN FILESIZE" if @bytes.length > @file_size
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zero_fill @file_size - 1
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return @bytes
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end
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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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@bytes.push 0 # null terminate
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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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@ -150,8 +193,6 @@ def jr(reg)
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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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@ -163,138 +204,27 @@ def lwi(val, dest)
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ori dest, val, dest
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end
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def label
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return $bytes.length + $base_addr
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end
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# this is a terrible idea and im doing it
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#$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 * 3
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$gp0 = 0x1F801810
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$gp1 = 0x1F801814
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base_addr = 0x80010000 # 0x10000 # 0x80010000
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file_size = 0x800 * 3
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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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f = File.new "exe-header.asm.rb", "r"
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exe_header = Assembler.new(base_addr, 0x800).assemble f.read
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f.close
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# # # PROGRAM CODE # # #
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nop
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jmp $base_addr + 0x400
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nop
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l_hello_world = label
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string "ello wrld!\n"
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l_printf = label
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addiu r0, 0xa0, at # address of bios func
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jr at
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addiu r0, 0x3f, t1 # printf number
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zero_fill 0x400 - 1
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nop
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lwi l_hello_world, a0
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jal l_printf
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addiu sp, -16, sp # delay slot
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addiu sp, 16, sp
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nop ; nop ; nop ; nop
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# THIS IS NEEDED
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lwi $gp1, t0
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lwi 0x03_00_00_00, t1 # display enable
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sw t1, 0, t0
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lwi $gp0, t0
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lwi 0xe1_000000 + 0b0_0_0_1_0_01_00_0_0000, t1
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sw t1, 0, t0
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# THIS IS NEEDED
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lwi 0xe4_000000 + (640) + (480 << 10), t1 # Drawing Area bottom right
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sw t1, 0, t0
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def line(st, en)
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lwi 0x40_ffffff, t1 # monochrome line, color ffffff
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sw t1, 0, t0
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lwi st, t1 # line vert 1
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sw t1, 0, t0
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lwi en, t1 # line vert 2
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sw t1, 0, t0
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end
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# l_end_loop = label
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line 0x0010_0010, 0x0030_0030
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line 0x0030_0030, 0x0060_0000
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line 0x0060_000a, 0x00f0_0060
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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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l_end_loop = label
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nop
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lwi l_end_loop, t9
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jr t9
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nop
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puts "assembled 0x#{$bytes.length.to_s 16} (#{$bytes.length}) bytes"
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raise "CODE IS GREATER THAN FILESIZE" if $bytes.length > $file_size
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zero_fill $file_size - 1
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f = File.new "main.asm.rb", "r"
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binary = Assembler.new(base_addr, file_size).assemble f.read
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f.close
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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.write exe_header.pack("C*")
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f.write binary.pack("C*")
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f.close
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18
exe-header.asm.rb
Normal file
18
exe-header.asm.rb
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@ -0,0 +1,18 @@
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# exe-header.asm.rb
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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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78
main.asm.rb
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78
main.asm.rb
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@ -0,0 +1,78 @@
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# main.asm.rb
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$gp0 = 0x1F801810
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$gp1 = 0x1F801814
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jmp l_start
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nop
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label :hello_world
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string "ello wrld!\n"
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label :printf
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addiu r0, 0xa0, at # address of bios func
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jr at
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addiu r0, 0x3f, t1 # printf number
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label :draw_line
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# todo: draw line function, take args in a0 - a3
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# tood: implement shift left so we can use that
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lwi $gp0, t0
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lwi 0x40_ffffff, t1 # monochrome line, color ffffff
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sw t1, 0, t0
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# lwi st, t1 # line vert 1
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sw t1, 0, t0
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# lwi en, t1 # line vert 2
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sw t1, 0, t0
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label :start
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nop ; nop ; nop ; nop
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# THIS IS NEEDED
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lwi $gp1, t0
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lwi 0x03_00_00_00, t1 # display enable
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sw t1, 0, t0
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lwi $gp0, t0
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lwi 0xe1_000000 + 0b0_0_0_1_0_01_00_0_0000, t1
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sw t1, 0, t0
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# THIS IS NEEDED
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lwi 0xe4_000000 + (640) + (480 << 10), t1 # Drawing Area bottom right
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sw t1, 0, t0
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def line(st, en)
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lwi 0x40_ffffff, t1 # monochrome line, color ffffff
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sw t1, 0, t0
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lwi st, t1 # line vert 1
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sw t1, 0, t0
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lwi en, t1 # line vert 2
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sw t1, 0, t0
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end
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line 0x0010_0010, 0x0030_0030
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line 0x0030_0030, 0x0060_0000
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line 0x0060_000a, 0x00f0_0060
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lwi l_hello_world, a0
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jal l_printf
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addiu sp, -16, sp # delay slot
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addiu sp, 16, sp
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label :end_loop
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lwi l_end_loop, t9
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jr t9
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nop
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