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collapseos/kernel/pgm.asm

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pgm: new kernel module The pgm module implements a shell hook so that when an unknown command is typed, we look into the mounted filesystem and look for a file with the same name as the command. If we find one, we load it in memory and run it.
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; 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.
;
pgm: have its own file handle
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; *** Requirements ***
; fs
;
pgm: new kernel module The pgm module implements a shell hook so that when an unknown command is typed, we look into the mounted filesystem and look for a file with the same name as the command. If we find one, we load it in memory and run it.
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; *** Defines ***
; PGM_CODEADDR: Memory address where to place the code we load.
pgm: have its own file handle
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;
; *** Variables ***
.equ PGM_HANDLE PGM_RAMSTART
.equ PGM_RAMEND PGM_HANDLE+FS_HANDLE_SIZE
pgm: new kernel module The pgm module implements a shell hook so that when an unknown command is typed, we look into the mounted filesystem and look for a file with the same name as the command. If we find one, we load it in memory and run it.
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; Routine suitable to plug into SHELL_CMDHOOK. HL points to the full cmdline.
shell: allow cmds to be shorter than 4 chars
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; which has been processed to replace the first ' ' with a null char.
pgm: new kernel module The pgm module implements a shell hook so that when an unknown command is typed, we look into the mounted filesystem and look for a file with the same name as the command. If we find one, we load it in memory and run it.
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pgmShellHook:
call fsIsOn
jr nz, .noFile
shell: allow cmds to be shorter than 4 chars
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; (HL) is suitable for a direct fsFindFN call
pgm: new kernel module The pgm module implements a shell hook so that when an unknown command is typed, we look into the mounted filesystem and look for a file with the same name as the command. If we find one, we load it in memory and run it.
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call fsFindFN
jr nz, .noFile
shell: allow cmds to be shorter than 4 chars
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; We have a file! Advance HL to args
xor a
call findchar
inc hl ; beginning of args
; Alright, ready to run!
pgm: new kernel module The pgm module implements a shell hook so that when an unknown command is typed, we look into the mounted filesystem and look for a file with the same name as the command. If we find one, we load it in memory and run it.
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jp pgmRun
.noFile:
ld a, SHELL_ERR_IO_ERROR
ret
; Loads code in file that FS_PTR is currently pointing at and place it in
pgm: properly pass shell args in HL
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; PGM_CODEADDR. Then, jump to PGM_CODEADDR. We expect HL to point to unparsed
; arguments being given to the program.
pgm: new kernel module The pgm module implements a shell hook so that when an unknown command is typed, we look into the mounted filesystem and look for a file with the same name as the command. If we find one, we load it in memory and run it.
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pgmRun:
call fsIsValid
jr nz, .ioError
pgm: properly pass shell args in HL
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push hl ; unparsed args
pgm: have its own file handle
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ld ix, PGM_HANDLE
pgm: new kernel module The pgm module implements a shell hook so that when an unknown command is typed, we look into the mounted filesystem and look for a file with the same name as the command. If we find one, we load it in memory and run it.
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call fsOpen
pgm: adapt to recent blkdev change With fsGetC becoming a "random address" API, it broke pgm. This commit fixes it. To avoid adding the weight of a blkdev in pgm, I manage the read offset directly in pgm.
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ld hl, 0 ; addr that we read in file handle
ld de, PGM_CODEADDR ; addr in mem we write to
pgm: new kernel module The pgm module implements a shell hook so that when an unknown command is typed, we look into the mounted filesystem and look for a file with the same name as the command. If we find one, we load it in memory and run it.
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.loop:
call fsGetC ; we use Z at end of loop
pgm: adapt to recent blkdev change With fsGetC becoming a "random address" API, it broke pgm. This commit fixes it. To avoid adding the weight of a blkdev in pgm, I manage the read offset directly in pgm.
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ld (de), a ; Z preserved
pgm: new kernel module The pgm module implements a shell hook so that when an unknown command is typed, we look into the mounted filesystem and look for a file with the same name as the command. If we find one, we load it in memory and run it.
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inc hl ; Z preserved in 16-bit
pgm: adapt to recent blkdev change With fsGetC becoming a "random address" API, it broke pgm. This commit fixes it. To avoid adding the weight of a blkdev in pgm, I manage the read offset directly in pgm.
2019-06-06 04:45:38 +10:00
inc de ; Z preserved in 16-bit
pgm: new kernel module The pgm module implements a shell hook so that when an unknown command is typed, we look into the mounted filesystem and look for a file with the same name as the command. If we find one, we load it in memory and run it.
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jr z, .loop
pgm: properly pass shell args in HL
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pop hl ; recall args
pgm: new kernel module The pgm module implements a shell hook so that when an unknown command is typed, we look into the mounted filesystem and look for a file with the same name as the command. If we find one, we load it in memory and run it.
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; ready to jump!
jp PGM_CODEADDR
.ioError:
ld a, SHELL_ERR_IO_ERROR
ret
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