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Details on x86-64 operand forms.

c-declarations
Joshua Potter 2024-04-15 21:21:46 -06:00
parent 45bcc6744c
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notes/.obsidian/plugins/obsidian-to-anki-plugin/data.json
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title: "2024-04-14"
---
- [ ] Anki Flashcards
- [ ] KoL
- [x] Anki Flashcards
- [x] KoL
- [ ] Sheet Music (10 min.)
- [ ] Go (1 Life & Death Problem)
- [ ] Korean (Read 1 Story)
- [ ] Interview Prep (1 Practice Problem)
- [ ] Log Work Hours (Max 3 hours)
- [ ] Log Work Hours (Max 3 hours)
* Read chapter on "Grokking the System Design Interview".

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---
title: "2024-04-15"
---
- [x] Anki Flashcards
- [x] KoL
- [ ] Sheet Music (10 min.)
- [ ] Go (1 Life & Death Problem)
- [ ] Korean (Read 1 Story)
- [x] Interview Prep (1 Practice Problem)
- [x] Log Work Hours (Max 3 hours)
* Notes on the different operand forms x86-64 instructions can take on.
* Setup room config for hide-and-seek application. This will drive the next bout of work.
* Reviewed GraphQL concepts.

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notes/set/trees.md
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@ -1010,15 +1010,6 @@ Reference: Thomas H. Cormen et al., _Introduction to Algorithms_, Fourth edition
<!--ID: 1713118128244-->
END%%
%%ANKI
Basic
What recursive definition describes the number of nodes in each levelof a complete $k$-ary tree?
Back: $a_n = k \cdot a_{n-1}$ with $a_0 = 1$
Reference: Thomas H. Cormen et al., _Introduction to Algorithms_, Fourth edition (Cambridge, Massachusett: The MIT Press, 2022).
Tags: algebra::sequence
<!--ID: 1713118128246-->
END%%
%%ANKI
Basic
What recursive definition describes the number of nodes in each level of a complete $k$-ary tree?

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notes/x86-64/instructions.md
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@ -60,6 +60,311 @@ Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Program
<!--ID: 1710959313826-->
END%%
## Instruction Classes
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.
<!--ID: 1713212889856-->
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.
<!--ID: 1713212889861-->
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.
<!--ID: 1713212889864-->
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.
<!--ID: 1713212889866-->
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.
<!--ID: 1713212889869-->
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.
<!--ID: 1713212889872-->
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.
<!--ID: 1713212889874-->
END%%
There are three types of operands:
* **Immediates**. These denote constant values. In ATT assembly, they are written with a `$` followed by an integer using standard C notation.
* **Registers**. These denote the contents of a register.
* **Memory**. These denote some memory location according to a computed address (i.e. the **effective address**).
| Type | Form | Operand Value | Name |
| --------- | ---------------- | ---------------------------------- | ------------------- |
| Immediate | $\$Imm$ | $Imm$ | Immediate |
| Register | $r_a$ | $R[r_a]$ | Register |
| Memory | $Imm$ | $M[Imm]$ | Absolute |
| Memory | $(r_a)$ | $M[R[r_a]]$ | Indirect |
| Memory | $Imm(r_b)$ | $M[Imm + R[r_b]]$ | Base + displacement |
| Memory | $(r_b, r_i)$ | $M[R[r_b] + R[r_i]]$ | Indexed |
| Memory | $Imm(r_b, r_i)$ | $M[Imm + R[r_b] + R[r_i]]$ | Indexed |
| Memory | $(,r_i,s)$ | $M[R[r_i] \cdot s]$ | Scaled indexed |
| Memory | $Imm(,r_i,s)$ | $M[Imm + R[r_i] \cdot s]$ | Scaled indexed |
| Memory | $(r_b,r_i,s)$ | $M[R[r_b] + R[r_i] \cdot s]$ | Scaled indexed |
| Memory | $Imm(r_b,r_i,s)$ | $M[Imm + R[r_b] + R[r_i] \cdot s]$ | Scaled indexed |
%%ANKI
Basic
What are the three types of operands instructions can act on?
Back: Immediates, registers, and memory addresses.
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713212889877-->
END%%
%%ANKI
Basic
What are the types of source operands instructions can specify?
Back: Immediates, registers, and memory addresses.
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713212889887-->
END%%
%%ANKI
Basic
What are the types of destination operands instructions can specify?
Back: Registers and memory addresses.
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713212889894-->
END%%
%%ANKI
Basic
What does an immediate operand denote?
Back: A constant value.
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713212889897-->
END%%
%%ANKI
Basic
In ATT syntax, how is an immediate written?
Back: Aa a `$` followed by an integer using standard C notation.
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713212889901-->
END%%
%%ANKI
Basic
In ATT syntax, how is a register written?
Back: Aa a `%` followed by the name of the register.
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713212889905-->
END%%
%%ANKI
Basic
What is the operand value of form $\$Imm$?
Back: $Imm$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713212889909-->
END%%
%%ANKI
Basic
What is the operand value of form $r_a$?
Back: $R[r_a]$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713212889912-->
END%%
%%ANKI
Basic
What is the operand value of form $Imm$?
Back: $M[Imm]$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713212889916-->
END%%
%%ANKI
Basic
What is the operand value of form $(r_a)$?
Back: $M[R[r_a]]$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713212889920-->
END%%
%%ANKI
Basic
What is the operand value of form $Imm(r_b)$?
Back: $M[Imm + R[r_b]]$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713212889923-->
END%%
%%ANKI
Basic
What is the operand value of form $(r_b, r_i)$?
Back: $M[R[r_b] + R[r_i]]$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713212889927-->
END%%
%%ANKI
Basic
What is the operand value of form $Imm(r_b, r_i)$?
Back: $M[Imm + R[r_b] + R[r_i]]$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713212889930-->
END%%
%%ANKI
Basic
What is the operand value of form $(,r_i,s)$?
Back: $M[R[r_i] \cdot s]$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713212889933-->
END%%
%%ANKI
Basic
What is the operand value of form $Imm(,r_i,s)$?
Back: $M[Imm + R[r_i] \cdot s]$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713212889937-->
END%%
%%ANKI
Basic
What is the operand value of form $(r_b,r_i,s)$?
Back: $M[R[r_b] + R[r_i] \cdot s]$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713212889941-->
END%%
%%ANKI
Basic
What is the operand value of form $Imm(r_b,r_i,s)$?
Back: $M[Imm + R[r_b] + R[r_i] \cdot s]$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713212889945-->
END%%
%%ANKI
Basic
What distinguishes operand value $r_a$ from $(r_a)$?
Back: The former denotes the register value. The latter denotes the value in memory at the address stored in $r_a$.
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713212889949-->
END%%
%%ANKI
Basic
What values can $s$ take on in operand form $Imm(r_b,r_i,s)$?
Back: $1$, $2$, $4$, or $8$.
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713212889952-->
END%%
%%ANKI
Basic
What operand form is named "immediate"?
Back: $\$Imm$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713213168875-->
END%%
%%ANKI
Basic
What operand form is named "register"?
Back: $r_a$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713213168878-->
END%%
%%ANKI
Basic
What operand form is named "absolute"?
Back: $Imm$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713213168881-->
END%%
%%ANKI
Basic
What operand form is named "indirect"?
Back: $(r_a)$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713213168884-->
END%%
%%ANKI
Basic
What operand form is named "base + displacement"?
Back: $Imm(r_b)$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713213168887-->
END%%
%%ANKI
Basic
What is the most general operand form named "indexed" (*not* "scaled indexed")?
Back: $Imm(r_b, r_i)$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713213168890-->
END%%
%%ANKI
Basic
What is the most general operand form named "scaled indexed" (*not* indexed)?
Back: $Imm(r_b, r_i, s)$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
<!--ID: 1713213168894-->
END%%
## Bibliography
* Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
* Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.