78 lines
3.0 KiB
Markdown
78 lines
3.0 KiB
Markdown
# TCPU
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Machine code interpreter written in pure C. Can execute programs up to 1 MEGABYTE (1048576 bytes) in size!!!
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## Building
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1. Install [cbuild](https://timerix.ddns.net:3322/Timerix/cbuild.git)
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2. Install [SDL3](https://github.com/libsdl-org/SDL) and [SDL3_image](https://github.com/libsdl-org/SDL_image) from package manager or source.
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3. ```sh
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cbuild build_exec_dbg
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```
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## Assembly language
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### Registers
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| name | code | size (bits) |
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|-----|------|----|
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| rax | 0x01 | 64 |
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| eax | 0x02 | 32 |
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| ax | 0x04 | 16 |
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| al | 0x07 | 8 |
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| ah | 0x08 | 8 |
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| rbx | 0x11 | 64 |
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| ebx | 0x12 | 32 |
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| bx | 0x14 | 16 |
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| bl | 0x17 | 8 |
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| bh | 0x18 | 8 |
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| rcx | 0x21 | 64 |
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| ecx | 0x22 | 32 |
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| cx | 0x24 | 16 |
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| cl | 0x27 | 8 |
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| ch | 0x28 | 8 |
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| rdx | 0x31 | 64 |
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| edx | 0x32 | 32 |
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| dx | 0x34 | 16 |
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| dl | 0x37 | 8 |
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| dh | 0x38 | 8 |
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### Instructions
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| name | arguments | details |
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|------|-----------|---------|
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| NOP | | ignored instruction |
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| EXIT | | stop the program with exit code in `eax` |
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| SYS | | call system function |
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| MOVC | `dst_register`, `const_value` | push constant value into `dst_register` |
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| MOVR | `dst_register`, `src_register` | copy value from `src_register` to `dst_register` |
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| ADD | `dst_register`, `src_register` | `dst += src` |
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| SUB | `dst_register`, `src_register` | `dst -= src` |
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| MUL | `dst_register`, `src_register` | `dst *= src` |
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| DIV | `dst_register`, `src_register` | `dst /= src` |
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| MOD | `dst_register`, `src_register` | `dst %= src` |
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| EQ | `dst_register`, `src_register` | `cmp_flag = dst == src` |
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| NE | `dst_register`, `src_register` | `cmp_flag = dst != src` |
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| LT | `dst_register`, `src_register` | `cmp_flag = dst < src` |
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| LE | `dst_register`, `src_register` | `cmp_flag = dst <= src` |
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| GT | `dst_register`, `src_register` | `cmp_flag = dst > src` |
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| GE | `dst_register`, `src_register` | `cmp_flag = dst >= src` |
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| NOT | `dst_register` | `dst = !dst` |
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| INV | `dst_register` | `dst = ~dst` |
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| OR | `dst_register`, `src_register` | `dst = dst \| src` |
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| XOR | `dst_register`, `src_register` | `dst = dst ^ src` |
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| AND | `dst_register`, `src_register` | `dst = dst & src` |
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| JMP | `dst_address_const` | goto `dst` |
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| JNZ | `dst_address_const` | if (`cmp_flag` != 0) goto `dst` |
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| JZ | `dst_address_const` | if (`cmp_flag` == 0) goto `dst` |
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### System functions
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To call a system function you need to push values to registers and write `SYS` opcode. The return value of a function will will be avaliable in `ax` after call.
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| name | `al` | `ah` | `rbx` | `ecx` | details |
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|------|------|------|-------|-------|---------|
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| read | 0 | file number | buffer pointer | buffer size | read data from file |
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| write | 1 | file number | buffer pointer | buffer size | write data to file |
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