https://github.com/oleks/compsys16-assembly
https://github.com/oleks/compsys16-assembly
Last synced: about 2 months ago
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- Host: GitHub
- URL: https://github.com/oleks/compsys16-assembly
- Owner: oleks
- Created: 2016-09-29T10:07:01.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2016-09-29T13:46:48.000Z (over 8 years ago)
- Last Synced: 2025-02-10T13:44:11.819Z (3 months ago)
- Language: Makefile
- Size: 12.7 KB
- Stars: 0
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
CompSys 2016 Assembly Explorer
==============================
Assembly files are here: `asm/*.S`.
To compile them all, just type
~~~
$ make
~~~
For each, we generate an object file (ending in `.o`) and an executable binary
(ending in `.bin`).
## Disassembling
Disassembling lets you inspect exactly the instructions that your assembly code
was assembled into.
You can use the `make` to quickly dump things as well.
For instance, see `asm/3.27.S`.
We can disassemble the object file as follows:
~~~
$ make dump-3.27.o
~~~
And disassemble the binary:
~~~
$ make dump-3.27.bin
~~~
## GDB
Disassembling doesn't give you insight into the run-time behaviour of your code.
You can use `make` to quickly run your code through GDB.
~~~
$ make gdb-3.27.bin
~~~
This will set a breakpoint at `main` and run the program, stopping at the first
line.
To validate how the stack behaves proceed as follows:
~~~
(gdb) print $rsp
$1 = (void *) 0x7fffffffdaf0
(gdb) step
top () at asm/3.27.S:8
8 sub $0x5, %rdi
(gdb) print $rsp
$2 = (void *) 0x7fffffffdae8
~~~