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Direct Address special case added(MOD 0 R/M 110)

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Joseph Ferano 2024-01-15 12:30:42 +07:00
parent 2a92f04836
commit 5b2542b0dd
1 changed files with 8 additions and 6 deletions
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14
decode.c
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@ -147,18 +147,20 @@ int main(int argc, char** argv)
{ {
// This is a trick because mod == 1 and mod == 2 will displace one and two bytes // This is a trick because mod == 1 and mod == 2 will displace one and two bytes
// respectively but mod == 3 wraps to 0 since it doesn't displace // respectively but mod == 3 wraps to 0 since it doesn't displace
int bytes_to_read = mod % 3; bool is_direct_addr = mod == 0 && rm == 0b110;
int bytes_to_read = is_direct_addr ? 2 : mod % 3;
bytes_read = fread(buf, sizeof(char), bytes_to_read, f); bytes_read = fread(buf, sizeof(char), bytes_to_read, f);
char* eac_name = get_eac_registers(rm); char* eac_name = is_direct_addr ? "" : get_eac_registers(rm);
char disp_buf[16] = {'\0'}; char disp_buf[16] = {'\0'};
if (bytes_to_read > 0) if (bytes_to_read > 0)
{ {
i16 disp = get_data(buf, bytes_to_read - 1); i16 disp = get_data(buf, bytes_to_read - 1);
sprintf(disp_buf, " %s %hd", disp >= 0 ? "+" : "-", abs(disp)); if (is_direct_addr) sprintf(disp_buf, "%d", abs(disp));
else sprintf(disp_buf, " %s %d", disp >= 0 ? "+" : "-", abs(disp));
} }
Register reg = registers[reg_idx]; Register rgstr = registers[reg_idx];
if (d) printf("mov %s, [%s%s] ;1", reg_name(reg, w), eac_name, disp_buf); if (d) printf("mov %s, [%s%s] ;1", reg_name(rgstr, w), eac_name, disp_buf);
else printf("mov [%s%s], %s ;2", eac_name, disp_buf, reg_name(reg, w)); else printf("mov [%s%s], %s ;2", eac_name, disp_buf, reg_name(rgstr, w));
} }
} }
// Immediate to register/memory // Immediate to register/memory