mirror of
https://github.com/hsoft/collapseos.git
synced 2024-07-21 15:00:19 +10:00
019d05f64c
That's my mega-commit you've all been waiting for. The code for the shell share more routines with userspace apps than with kernel units, because, well, its behavior is that of a userspace app, not a device driver. This created a weird situation with libraries and jump tables. Some routine belonging to the `kernel/` directory felt weird there. And then comes `apps/basic`, which will likely share even more code with the shell. I was seeing myself creating huge jump tables to reuse code from the shell. It didn't feel right. Moreover, we'll probably want basic-like apps to optionnally replace the shell. So here I am with this huge change in the project structure. I didn't test all recipes on hardware yet, I will do later. I might have broken some... But now, the structure feels better and the line between what belongs to `kernel` and what belongs to `apps` feels clearer.
52 lines
1.4 KiB
NASM
52 lines
1.4 KiB
NASM
; pgm - execute programs loaded from filesystem
|
|
;
|
|
; Implements a shell hook that searches the filesystem for a file with the same
|
|
; name as the cmd, loads that file in memory and executes it, sending the
|
|
; program a pointer to *unparsed* arguments in HL.
|
|
;
|
|
; We expect the loaded program to return a status code in A. 0 means success,
|
|
; non-zero means error. Programs should avoid having error code overlaps with
|
|
; the shell so that we know where the error comes from.
|
|
;
|
|
; *** Requirements ***
|
|
; fs
|
|
;
|
|
; *** Defines ***
|
|
; PGM_CODEADDR: Memory address where to place the code we load.
|
|
;
|
|
; *** Variables ***
|
|
.equ PGM_HANDLE PGM_RAMSTART
|
|
.equ PGM_RAMEND @+FS_HANDLE_SIZE
|
|
|
|
; Routine suitable to plug into SHELL_CMDHOOK. HL points to the full cmdline.
|
|
; which has been processed to replace the first ' ' with a null char.
|
|
pgmShellHook:
|
|
; (HL) is suitable for a direct fsFindFN call
|
|
call fsFindFN
|
|
jr nz, .noFile
|
|
; We have a file! Advance HL to args
|
|
xor a
|
|
call findchar
|
|
inc hl ; beginning of args
|
|
; Alright, ready to run!
|
|
jp .run
|
|
.noFile:
|
|
ld a, SHELL_ERR_IO_ERROR
|
|
ret
|
|
.run:
|
|
push hl ; unparsed args
|
|
ld ix, PGM_HANDLE
|
|
call fsOpen
|
|
ld hl, 0 ; addr that we read in file handle
|
|
ld de, PGM_CODEADDR ; addr in mem we write to
|
|
.loop:
|
|
call fsGetB ; we use Z at end of loop
|
|
ld (de), a ; Z preserved
|
|
inc hl ; Z preserved in 16-bit
|
|
inc de ; Z preserved in 16-bit
|
|
jr z, .loop
|
|
|
|
pop hl ; recall args
|
|
; ready to jump!
|
|
jp PGM_CODEADDR
|