3.4 KiB
| title | TARGET DECK | FILE TAGS | tags | |
|---|---|---|---|---|
| Registers | Obsidian::STEM | x86-64 |
|
Overview
An x86-64 CPU contains a set of 16 general-purpose registers storing 64-bit values. They are used to store integers and pointers.
| 1 Byte | 2 Bytes | 4 Bytes | 8 Bytes | Purpose |
|---|---|---|---|---|
%al |
%ax |
%eax |
%rax |
Return value |
%bl |
%bx |
%ebx |
%rbx |
Callee saved |
%cl |
%cx |
%ecx |
%rcx |
4th argument |
%dl |
%dx |
%edx |
%rdx |
3rd argument |
%sil |
%si |
%esi |
%rsi |
2nd argument |
%dil |
%di |
%edi |
%rdi |
1st argument |
%bpl |
%bp |
%ebp |
%rbp |
Callee saved |
%spl |
%sp |
%esp |
%rsp |
Stack pointer |
%r8b |
%r8w |
%r8d |
%r8 |
5th argument |
%r9b |
%r9w |
%r9d |
%r9 |
6th argument |
%r10b |
%r10w |
%r10d |
%r10 |
Caller saved |
%r11b |
%r11w |
%r11d |
%r11 |
Caller saved |
%r12b |
%r12w |
%r12d |
%r12 |
Callee saved |
%r13b |
%r13w |
%r13d |
%r13 |
Callee saved |
%r14b |
%r14w |
%r14d |
%r14 |
Callee saved |
%r15b |
%r15w |
%r15d |
%r15 |
Callee saved |
%%ANKI Basic How many general-purpose registers are available to x86-64 instructions? Back: 16 Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.
END%%
%%ANKI
Cloze
The x86 64-bit registers all start with prefix {%r}.
Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.
END%%
%%ANKI
Cloze
The x86 32-bit registers all start with prefix {%e}.
Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.
END%%
%%ANKI Basic Instructions that generate 1-byte quantities do what to the remaining bytes of a register? Back: Leaves them alone. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.
END%%
%%ANKI Basic Instructions that generate 2-byte quantities do what to the remaining bytes of a register? Back: Leaves them alone. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.
END%%
%%ANKI Basic Instructions that generate 4-byte quantities do what to the remaining bytes of a register? Back: Zeroes them out. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.
END%%
%%ANKI Basic Instructions that generate 8-byte quantities do what to the remaining bytes of a register? Back: N/A Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.
END%%
Bibliography
- Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.