95 lines
4.8 KiB
Text
95 lines
4.8 KiB
Text
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01111111 01000101 01001100 01000110 # ELF Magic
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00000010 00000010 00000001 00000000 # 64 bit big endian elf
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00000000000000000000000000000000
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00000000000000000000000000000000 # padding
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0000000000000010 0000000000010101 # PPC ELF
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00000000000000000000000000000001 # original version elf
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00000000000000000000000000000000
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00010000000000000000000001111000 # Program Entry position
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00000000000000000000000000000000
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00000000000000000000000001000000 # Program header table position
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00000000000000000000000000000000
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00000000000000000000000000000000 # Section Header table position
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00000000000000000000000000000000 # Flags
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0000000001000000 0000000000111000 # Header Size, Size of an entry in the program header table
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0000000000000001 0000000001000000 # One program header, section header size
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0000000000000000 0000000000000000 # no section headers, no section name section
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00000000000000000000000000000001 # PT_LOAD
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00000000000000000000000000000111 # rwx
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00000000000000000000000000000000
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00000000000000000000000000000000 # Load from ZERO
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00000000000000000000000000000000
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00010000000000000000000000000000 # Load at l6MB
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00000000000000000000000000000000
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00010000000000000000000000000000 # Who cares about physical address
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00000000000000000000000000000000
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00000000000000000000000100111100 # size
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00000000000000000000000000000000
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00000000000000000000000100111100 # memory size
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00000000000000000000000000000000
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00000000000000000000000000000100 # align 4 bytes
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#.section .text
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#.global _start
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#
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#_start:
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111010 00011 00001 0000000000000000 # ld 3, O(l) // get argc
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001011 000 0 1 00011 0000000000000011 # cmpdi 3, 3 // check if argc is 3
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010000 01100 00000 00000000101101 0 0 # blt exit // exit otherwise
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#
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001110 00011 00000 1111111110011100 # li 3, -lOO // AT_FDCWD
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111010 00100 00001 0000000000010000 # ld 4, 16(l) // first argument
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001110 00101 00000 0000000000000000 # li 5, O // O_RDONLY
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001110 00110 00000 0000000000000000 # li 6, O // no mode
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001110 00000 00000 0000000100011110 # li O, 286 // openat
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010001 00000 00000 0000 0000000 000 1 0 # sc
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010000 01100 00011 00000000100110 0 0 # bso exit // exit otherwise
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011111 00011 01100 00011 0110111100 0 # mr l2, 3 // save file descriptor
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#
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001110 00011 00000 1111111110011100 # li 3, -lOO // AT_FDCWD
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111010 00100 00001 0000000000011000 # ld 4, 24(l) // second argument
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001110 00101 00000 0000001001000001 # li 5, 577 // O_TRUNC | O_CREAT | O_WRONLY
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001110 00110 00000 0000000111101101 # li 6, 493 // rwxr-xr-x
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001110 00000 00000 0000000100011110 # li O, 286 // openat
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010001 00000 00000 0000 0000000 000 1 0 # sc
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010000 01100 00011 00000000011110 0 0 # bso exit // exit otherwise
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011111 00011 01101 00011 0110111100 0 # mr l3, 3 // save file descriptor
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#
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#.Lloop_init:
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001110 01110 00000 0000000000000000 # li l4, O // accumulator
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001110 01111 00000 0000000000100000 # li l5, 32 // Counter
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#.Lread_loop:
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011111 01100 00011 01100 0110111100 0 # mr 3, l2 // source fd
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011111 00001 00100 00001 0110111100 0 # mr 4, l // destination buffer
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001110 00101 00000 0000000000000001 # li 5, l // size
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001110 00000 00000 0000000000000011 # li O, 3 // read
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010001 00000 00000 0000 0000000 000 1 0 # sc
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010000 01100 00011 00000000010101 0 0 # bso exit // exit otherwise
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001011 000 0 1 00011 0000000000000000 # cmpdi 3, O // check if eof
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010000 01100 00010 00000000010011 0 0 # beq exit
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#
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100010 00011 00001 0000000000000000 # lbz 3, O(l) // get byte
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011100 00011 00100 0000000011111110 # andi. 4, 3, OxFE // clear bottom bit
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001011 000 0 0 00100 0000000000110000 # cmpwi 4, Ox3O // check if byte is a number
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010000 00100 00010 11111111110101 0 0 # bne .Lread_loop // loop if not
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#
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011100 00011 00011 0000000000000001 # andi. 3, 3, l // get the bottom bit
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010101 01110 01110 00001 00000 11110 0 # rlwinm l4, l4, l, O, 3O // shift accumulator
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011111 01110 01110 00011 0110111100 0 # or l4, l4, 3 // add bottom bit to accumulator
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001110 01111 01111 1111111111111111 # addi l5, l5, -l // decrement counter
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001011 000 0 0 01111 0000000000000000 # cmpwi l5, O // check if counter is O
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010000 00100 00010 11111111101111 0 0 # bne .Lread_loop // loop if not
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#
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100100 01110 00001 0000000000000000 # stw l4, O(l) // store accumulator
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011111 01101 00011 01101 0110111100 0 # mr 3, l3 // dest fd
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011111 00001 00100 00001 0110111100 0 # mr 4, l // source buffer
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001110 00101 00000 0000000000000100 # li 5, 4 // size
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001110 00000 00000 0000000000000100 # li O, 4 // write
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010001 00000 00000 0000 0000000 000 1 0 # sc
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010000 01100 00011 00000000000010 0 0 # bso exit // exit otherwise
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010010 11111111111111111110010100 # b .Lloop_init // loop
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#exit:
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001110 00000 00000 0000000000000001 # li O, l // exit
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010001 00000 00000 0000 0000000 000 1 0 # sc
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