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perfaware/part1: Handle listing 0040

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doyle 2023-03-09 23:20:02 +11:00 committed by committed-name
parent c4e2be3926
commit 53ca69bfc5
2 changed files with 49 additions and 69 deletions
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56
part1/sim8086.c
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@ -404,13 +404,13 @@ int main(int argc, char **argv)
// NOTE: Memory mode w/ effective address calculation
// =========================================================
bool direct_address = mod == 0b00 && rm == 0b110;
uint16_t displacement = 0;
int16_t displacement = 0;
if (mod == 0b10 || direct_address) { // Mem mode 16 bit displacement
uint8_t disp_lo = S86_BufferIteratorNextByte(&buffer_it);
uint8_t disp_hi = S86_BufferIteratorNextByte(&buffer_it);
displacement = (uint16_t)disp_lo << 0 | (uint16_t)disp_hi << 8;
displacement = (int16_t)((uint16_t)disp_hi << 8 | (uint16_t)disp_lo << 0);
} else if (mod == 0b01) { // Mem mode 8 bit displacement
displacement = S86_BufferIteratorNextByte(&buffer_it);
displacement = (int8_t)S86_BufferIteratorNextByte(&buffer_it);
} else {
S86_ASSERT(mod == 0b00 /*Mem mode (no displacement)*/);
}
@ -424,18 +424,8 @@ int main(int argc, char **argv)
if (direct_address) {
effective_addr_size += snprintf(effective_addr_buffer + effective_addr_size,
sizeof(effective_addr_buffer) - effective_addr_size,
"%u",
displacement);
} else {
if (rm == 0b110) {
effective_addr_buffer[effective_addr_size++] = 'b';
effective_addr_buffer[effective_addr_size++] = 'p';
if (displacement) {
effective_addr_size += snprintf(effective_addr_buffer + effective_addr_size,
sizeof(effective_addr_buffer) - effective_addr_size,
" + %u",
displacement);
}
"%s%d",
displacement >= 0 ? "" : "-", displacement >= 0 ? displacement : -displacement);
} else {
S86_Str8 base_calc = {0};
switch (rm) {
@ -445,6 +435,7 @@ int main(int argc, char **argv)
case 0b011: base_calc = S86_STR8("bp + di"); break;
case 0b100: base_calc = S86_STR8("si"); break;
case 0b101: base_calc = S86_STR8("di"); break;
case 0b110: base_calc = S86_STR8("bp"); break;
case 0b111: base_calc = S86_STR8("bx"); break;
default: S86_ASSERT(!"Invalid rm value, must be 3 bits"); break;
}
@ -452,12 +443,11 @@ int main(int argc, char **argv)
memcpy(effective_addr_buffer + effective_addr_size, base_calc.data, base_calc.size);
effective_addr_size += S86_CAST(int)base_calc.size;
if (mod == 0b01 || mod == 0b10) {
if ((mod == 0b01 || mod == 0b10) && displacement) {
effective_addr_size += snprintf(effective_addr_buffer + effective_addr_size,
sizeof(effective_addr_buffer) - effective_addr_size,
" + %u",
displacement);
}
" %c %d",
displacement >= 0 ? '+' : '-', displacement >= 0 ? displacement : -displacement);
}
}
effective_addr_buffer[effective_addr_size++] = ']';
@ -485,13 +475,13 @@ int main(int argc, char **argv)
// NOTE: Memory mode w/ effective address calculation
// =========================================================
bool direct_address = mod == 0b00 && rm == 0b110;
uint16_t displacement = 0;
int16_t displacement = 0;
if (mod == 0b10 || direct_address) { // Mem mode 16 bit displacement
uint8_t disp_lo = S86_BufferIteratorNextByte(&buffer_it);
uint8_t disp_hi = S86_BufferIteratorNextByte(&buffer_it);
displacement = (uint16_t)disp_lo << 0 | (uint16_t)disp_hi << 8;
displacement = (int16_t)((uint16_t)disp_lo << 0 | (uint16_t)disp_hi << 8);
} else if (mod == 0b01) { // Mem mode 8 bit displacement
displacement = S86_BufferIteratorNextByte(&buffer_it);
displacement = (int8_t)S86_BufferIteratorNextByte(&buffer_it);
} else {
S86_ASSERT(mod == 0b00 /*Mem mode (no displacement)*/);
}
@ -513,18 +503,8 @@ int main(int argc, char **argv)
if (direct_address) {
effective_addr_size += snprintf(effective_addr_buffer + effective_addr_size,
sizeof(effective_addr_buffer) - effective_addr_size,
"%u",
displacement);
} else {
if (rm == 0b110) {
effective_addr_buffer[effective_addr_size++] = 'b';
effective_addr_buffer[effective_addr_size++] = 'p';
if (displacement) {
effective_addr_size += snprintf(effective_addr_buffer + effective_addr_size,
sizeof(effective_addr_buffer) - effective_addr_size,
" + %u",
displacement);
}
"%s%d",
displacement >= 0 ? "" : "-", displacement >= 0 ? displacement : -displacement);
} else {
S86_Str8 base_calc = {0};
switch (rm) {
@ -534,6 +514,7 @@ int main(int argc, char **argv)
case 0b011: base_calc = S86_STR8("bp + di"); break;
case 0b100: base_calc = S86_STR8("si"); break;
case 0b101: base_calc = S86_STR8("di"); break;
case 0b110: base_calc = S86_STR8("bp"); break;
case 0b111: base_calc = S86_STR8("bx"); break;
default: S86_ASSERT(!"Invalid rm value, must be 3 bits"); break;
}
@ -541,12 +522,11 @@ int main(int argc, char **argv)
memcpy(effective_addr_buffer + effective_addr_size, base_calc.data, base_calc.size);
effective_addr_size += S86_CAST(int)base_calc.size;
if (mod == 0b01 || mod == 0b10) {
if ((mod == 0b01 || mod == 0b10) && displacement) {
effective_addr_size += snprintf(effective_addr_buffer + effective_addr_size,
sizeof(effective_addr_buffer) - effective_addr_size,
" + %u",
displacement);
}
" %c %d",
displacement >= 0 ? '+' : '-', displacement >= 0 ? displacement : -displacement);
}
}
effective_addr_buffer[effective_addr_size++] = ']';

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