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This commit is contained in:
Kartik Agaram 2020-01-12 21:30:29 -08:00
parent 271f26d791
commit 730e689467
3 changed files with 14 additions and 13 deletions
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7
README.md
View File

@ -465,11 +465,12 @@ trace, or if you have questions or complaints.
### Data Structures
* Kernel strings: null-terminated arrays of bytes. Unsafe and to be avoided,
* Kernel strings: null-terminated regions of memory. Unsafe and to be avoided,
but needed for interacting with the kernel.
* Strings: length-prefixed arrays of bytes. String contents are preceded by
4 bytes (32 bytes) containing the `length` of the array.
* Arrays: length-prefixed regions of memory containing multiple elements of a
single type. Contents are preceded by 4 bytes (32 bits) containing the
`length` of the array in bytes.
* Slices: a pair of 32-bit addresses denoting a [half-open](https://en.wikipedia.org/wiki/Interval_(mathematics))
\[`start`, `end`) interval to live memory with a consistent lifetime.

14
init.linux
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@ -19,19 +19,19 @@ syscall_exit: # status/ebx : int
cd/syscall 0x80/imm8
# http://man7.org/linux/man-pages/man2/read.2.html
syscall_read: # fd/ebx : int, buf/ecx : address, size/edx : int -> nbytes-or-error/eax : int
syscall_read: # fd/ebx : int, buf/ecx : addr, size/edx : int -> nbytes-or-error/eax : int
b8/copy-to-eax 3/imm32
cd/syscall 0x80/imm8
c3/return
# http://man7.org/linux/man-pages/man2/write.2.html
syscall_write: # fd/ebx : int, buf/ecx : address, size/edx : int -> nbytes-or-error/eax : int
syscall_write: # fd/ebx : int, buf/ecx : addr, size/edx : int -> nbytes-or-error/eax : int
b8/copy-to-eax 4/imm32
cd/syscall 0x80/imm8
c3/return
# http://man7.org/linux/man-pages/man2/open.2.html
syscall_open: # filename/ebx : (address null-terminated-string), flags/ecx : int -> fd-or-error/eax : int
syscall_open: # filename/ebx : (addr kernel-string), flags/ecx : int -> fd-or-error/eax : int
b8/copy-to-eax 5/imm32
cd/syscall 0x80/imm8
c3/return
@ -43,25 +43,25 @@ syscall_close: # fd/ebx : int -> status/eax
c3/return
# http://man7.org/linux/man-pages/man2/creat.2.html
syscall_creat: # filename/ebx : (address null-terminated-string) -> fd-or-error/eax : int
syscall_creat: # filename/ebx : (addr kernel-string) -> fd-or-error/eax : int
b8/copy-to-eax 8/imm32
cd/syscall 0x80/imm8
c3/return
# http://man7.org/linux/man-pages/man2/unlink.2.html
syscall_unlink: # filename/ebx : (address null-terminated-string) -> status/eax : int
syscall_unlink: # filename/ebx : (addr kernel-string) -> status/eax : int
b8/copy-to-eax 0xa/imm32
cd/syscall 0x80/imm8
c3/return
# http://man7.org/linux/man-pages/man2/rename.2.html
syscall_rename: # source/ebx : (address null-terminated-string), dest/ecx : (address null-terminated-string) -> status/eax : int
syscall_rename: # source/ebx : (addr kernel-string), dest/ecx : (addr kernel-string) -> status/eax : int
b8/copy-to-eax 0x26/imm32
cd/syscall 0x80/imm8
c3/return
# https://github.com/torvalds/linux/blob/fa121bb3fed6313b1f0af23952301e06cf6d32ed/mm/nommu.c#L1352
syscall_mmap: # arg/ebx : (address mmap_arg_struct) -> status/eax : int
syscall_mmap: # arg/ebx : (addr mmap_arg_struct) -> status/eax : int
# the important thing: ebx+4 contains the 32-bit size to be allocated
b8/copy-to-eax 0x5a/imm32
cd/syscall 0x80/imm8

6
init.soso
View File

@ -17,17 +17,17 @@ syscall_exit: # status/ebx : int
b8/copy-to-eax 8/imm32
cd/syscall 0x80/imm8
syscall_read: # fd/ebx : int, buf/ecx : address, size/edx : int -> nbytes-or-error/eax : int
syscall_read: # fd/ebx : int, buf/ecx : addr, size/edx : int -> nbytes-or-error/eax : int
b8/copy-to-eax 2/imm32
cd/syscall 0x80/imm8
c3/return
syscall_write: # fd/ebx : int, buf/ecx : address, size/edx : int -> nbytes-or-error/eax : int
syscall_write: # fd/ebx : int, buf/ecx : addr, size/edx : int -> nbytes-or-error/eax : int
b8/copy-to-eax 3/imm32
cd/syscall 0x80/imm8
c3/return
syscall_open: # filename/ebx : (address null-terminated-string), flags/ecx : int -> fd-or-error/eax : int
syscall_open: # filename/ebx : (addr kernel-string), flags/ecx : int -> fd-or-error/eax : int
b8/copy-to-eax 0/imm32
cd/syscall 0x80/imm8
c3/return