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# twasm
this will be a self hosted, very minimal subset of 64 bit asm
### goals
I want to compile Bootler and Twasm with the Twasm assembler
### memory map
```
+------ 0x00100000 ------+
| hardware, bios stuff |
+------ 0x00080000 ------+
| output binary |
+------ 0x00070000 ------+
| token table |
+------ 0x00060000 ------+
| test arena |
+------ 0x00050000 ------+
| stack (rsp) |
+------------------------+
| input |
+------------------------+ <- this is lined up to a sector
| | <- and this is less than a sector
+------------------------+
| assembler |
+------ 0x00010000 ------+
| bootloader, bios, etc. |
+------------------------+
```
each word represents a token on the token table.
#### token table (TT)
each token gets loaded into the token table with the following form:
```
+----------+-----------------------+
| 31 16 | 15 0 |
+----------+-----------------------+
| reserved | token id |
+----------+-----------------------+
```
### token IDs
supported tokens are listed below
| token | id | notes |
|-------|--------|-|
| rax | 0x0000 | |
| rbx | 0x0001 | |
| rcx | 0x0002 | |
| rdx | 0x0003 | |
| rsi | 0x0004 | |
| rdi | 0x0005 | |
| rsp | 0x0006 | |
| rbp | 0x0007 | |
| r8 | 0x0008 | |
| r9 | 0x0009 | |
| r10 | 0x000A | |
| r11 | 0x000B | |
| r12 | 0x000C | |
| r13 | 0x000D | |
| r14 | 0x000E | |
| r15 | 0x000F | |
| eax | 0x0010 | |
| ebx | 0x0011 | |
| ecx | 0x0012 | |
| edx | 0x0013 | |
| esi | 0x0014 | |
| edi | 0x0015 | |
| esp | 0x0016 | |
| ebp | 0x0017 | |
| r8d | 0x0018 | |
| r9d | 0x0019 | |
| r10d | 0x001A | |
| r11d | 0x001B | |
| r12d | 0x001C | |
| r13d | 0x001D | |
| r14d | 0x001E | |
| r15d | 0x001F | |
| ax | 0x0020 | |
| bx | 0x0021 | |
| cx | 0x0022 | |
| dx | 0x0023 | |
| si | 0x0024 | |
| di | 0x0025 | |
| sp | 0x0026 | |
| bp | 0x0027 | |
| r8w | 0x0028 | |
| r9w | 0x0029 | |
| r10w | 0x002A | |
| r11w | 0x002B | |
| r12w | 0x002C | |
| r13w | 0x002D | |
| r14w | 0x002E | |
| r15w | 0x002F | |
| al | 0x0030 | |
| bl | 0x0031 | |
| cl | 0x0032 | |
| dl | 0x0033 | |
| sil | 0x0034 | |
| dil | 0x0035 | |
| spl | 0x0036 | |
| bpl | 0x0037 | |
| r8b | 0x0038 | |
| r9b | 0x0039 | |
| r10b | 0x003A | |
| r11b | 0x003B | |
| r12b | 0x003C | |
| r13b | 0x003D | |
| r14b | 0x003E | |
| r15b | 0x003F | |
| ah | 0x0040 | |
| bh | 0x0041 | |
| ch | 0x0042 | |
| dh | 0x0043 | |
| cs | 0x0044 | |
| ds | 0x0045 | |
| es | 0x0046 | |
| fs | 0x0047 | |
| gs | 0x0048 | |
| ss | 0x0049 | |
| cr0 | 0x004A | |
| cr2 | 0x004B | |
| cr3 | 0x004C | |
| cr4 | 0x004D | |
| cr8 | 0x004E | |
| | 0xFFFF | unrecognised token |
|
