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56 lines
1.3 KiB
56 lines
1.3 KiB
#include "../common.h" |
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static void |
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decode_and_print_reg_reg_movs(u8 *data, u64 size) |
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{ |
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printf("bits 16\n\n"); |
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/* We do not handle corrupt binaries */ |
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for (u64 i = 0; i < size; i += 2) { |
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u8 b1 = data[i + 0]; |
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u8 b2 = data[i + 1]; |
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u8 D_flag = (b1 & 0x2) >> 1; |
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u8 W_flag = b1 & 0x1; |
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u8 mod = (b2 & 0xC0) >> 6; |
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u8 reg_field = (b2 & 0x38) >> 3; |
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u8 rm_field = b2 & 0x7; |
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const char **regs = W_flag ? REGS_W1 : REGS_W0; |
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const char **rms = W_flag ? RM_W1 : RM_W0; |
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if (D_flag) { |
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/* Instruction destination is specified in REG field */ |
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printf("mov %s, %s\n", regs[reg_field], rms[rm_field]); |
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} else { |
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/* Instruction source is specified in REG field */ |
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printf("mov %s, %s\n", rms[rm_field], regs[reg_field]); |
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} |
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} |
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} |
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int |
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main(int argc, char **argv) |
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{ |
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if (argc != 2) { |
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fprintf(stderr, "Usage: %s binary_file\n", argv[0]); |
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return(1); |
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} |
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char *filename = argv[1]; |
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int fd = open(filename, O_RDONLY); |
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if (fd == -1) { |
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perror("open"); |
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return(1); |
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} |
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u64 size = file_size(fd); |
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u8 *data = read_file(fd, size); |
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decode_and_print_reg_reg_movs(data, size); |
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return(0); |
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} |