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Fix BSS obliteration by mliparam during exec().

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Using mliparam at this time could lead to corruption at the
start of the new executed program if BSS is real full and
mliparam is over $BB00.
The fix is to open the file from the loader stub instead of doing
it before the C library shutdown.
This commit is contained in:
Colin Leroy-Mira 2023-12-12 18:03:00 +01:00 committed by Oliver Schmidt
parent 05aae60816
commit 1093d169ad
1 changed files with 31 additions and 34 deletions
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65
libsrc/apple2/exec.s
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@ -121,35 +121,9 @@ setbuf: lda #$00 ; Low byte
dex
dex
; Set I/O buffer
sta mliparam + MLI::OPEN::IO_BUFFER
stx mliparam + MLI::OPEN::IO_BUFFER+1
; PATHNAME already set
.assert MLI::OPEN::PATHNAME = MLI::INFO::PATHNAME, error
; Lower file level to avoid program file
; being closed by C library shutdown code
ldx LEVEL
stx level
beq :+
dec LEVEL
; Open file
: lda #OPEN_CALL
ldx #OPEN_COUNT
jsr callmli
; Restore file level
ldx level
stx LEVEL
bcc :+
jmp oserr
; Get and save fd
: lda mliparam + MLI::OPEN::REF_NUM
sta read_ref
sta close_ref
; Set OPEN MLI call I/O buffer parameter
sta io_buffer
stx io_buffer+1
.ifdef __APPLE2ENH__
; Calling the 80 column firmware needs the ROM switched
@ -194,14 +168,25 @@ setbuf: lda #$00 ; Low byte
; Initiate C library shutdown
jmp _exit
.bss
level : .res 1
.rodata
source:
; Open program file
; PATHNAME parameter is already set (we reuse
; the copy at $0280); IO_BUFFER has been setup
; before shutting down the C library
jsr $BF00
.byte OPEN_CALL
.word open_param
bcs error
; Copy REF_NUM to MLI READ and CLOSE parameters
lda open_ref
sta read_ref
sta close_ref
; Read whole program file
source: jsr $BF00
jsr $BF00
.byte READ_CALL
.word read_param
bcs error
@ -254,6 +239,14 @@ jump: jmp (data_buffer)
file_type = * - source + target
.byte $00
open_param = * - source + target
.byte $03 ; PARAM_COUNT
.addr $0280 ; PATHNAME
io_buffer = * - source + target
.addr $0000 ; IO_BUFFER
open_ref = * - source + target
.byte $00 ; REF_NUM
read_param = * - source + target
.byte $04 ; PARAM_COUNT
read_ref = * - source + target
@ -285,4 +278,8 @@ size = * - source
target = DOSWARM - size
; Make sure that the loader isn't too big, and
; fits in $300-$3D0
.assert target >= $300, error
dosvec: jmp quit