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ec7751332f
The final part of exec() called 'excexit' and only then restored the stack pointer to its value at program entry. 'excexit' does all cleanup (the same as '_exit()'), which means that on the atarixl target the ROM is banked in again. On big programs the 'SP_save' variable might reside at a high memory address which is no longer accessible after the ROM has been banked in. The change just moves the restoration of the stack pointer before the call to 'excexit'. Another change lets exec.s compile if UCASE_FILENAME is not defined. And some other small cleanups, also in open.s.
178 lines
4.0 KiB
ArmAsm
178 lines
4.0 KiB
ArmAsm
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; Christian Groessler, Jan-2003
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;
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; int open(const char *name,int flags,...);
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;
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.include "atari.inc"
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.include "fcntl.inc"
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.include "errno.inc"
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.include "fd.inc"
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.include "zeropage.inc"
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.export _open
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.destructor closeallfiles, 5
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.import _close
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.import clriocb
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.import fddecusage,newfd
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.import findfreeiocb
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.import incsp4
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.import ldaxysp,addysp
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.import __oserror
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.ifdef UCASE_FILENAME
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.import ucase_fn
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.endif
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.proc _open
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dey ; parm count < 4 shouldn't be needed to be checked
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dey ; (it generates a c compiler warning)
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dey
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dey
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beq parmok ; parameter count ok
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jsr addysp ; fix stack, throw away unused parameters
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parmok: jsr findfreeiocb
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beq iocbok ; we found one
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lda #<EMFILE ; "too many open files"
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seterr: jsr __directerrno
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jsr incsp4 ; clean up stack
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lda #$FF
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tax
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rts ; return -1
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; process the mode argument
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iocbok: stx tmp4
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jsr clriocb ; init with zero
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ldy #1
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jsr ldaxysp ; get mode
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ldx tmp4
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pha
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and #O_APPEND
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beq no_app
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pla
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and #15
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cmp #O_RDONLY ; DOS supports append with write-only only
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beq invret
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cmp #O_RDWR
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beq invret
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lda #OPNOT|APPEND
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bne set
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.ifndef UCASE_FILENAME
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invret: lda #<EINVAL ; file name is too long
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jmp seterr
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.endif
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no_app: pla
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and #15
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cmp #O_RDONLY
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bne l1
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lda #OPNIN
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set: sta ICAX1,x
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bne cont
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l1: cmp #O_WRONLY
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bne l2
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lda #OPNOT
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bne set
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l2: ; O_RDWR
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lda #OPNOT|OPNIN
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bne set
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; process the filename argument
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cont: ldy #3
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jsr ldaxysp
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.ifdef UCASE_FILENAME
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.ifdef DEFAULT_DEVICE
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ldy #$80
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.else
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ldy #$00
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.endif
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sty tmp2 ; set flag for ucase_fn
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jsr ucase_fn
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bcc ucok1
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invret: lda #<EINVAL ; file name is too long
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jmp seterr
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ucok1:
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.endif ; defined UCASE_FILENAME
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ldy tmp4
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;AX - points to filename
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;Y - iocb to use, if open needed
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jsr newfd ; maybe we don't need to open and can reuse an iocb
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; returns fd num to use in tmp2, all regs unchanged
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bcs doopen ; C set: open needed
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lda #0 ; clears N flag
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beq finish
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doopen: sta ICBAL,y
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txa
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sta ICBAH,y
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ldx tmp4
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lda #OPEN
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sta ICCOM,x
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jsr CIOV
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; clean up the stack
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finish: php
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txa
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pha
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tya
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pha
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.ifdef UCASE_FILENAME
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ldy tmp3 ; get size
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jsr addysp ; free used space on the stack
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.endif ; defined UCASE_FILENAME
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jsr incsp4 ; clean up stack
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pla
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tay
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pla
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tax
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plp
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bpl ok
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sty tmp3 ; remember error code
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lda #CLOSE
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sta ICCOM,x
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jsr CIOV ; close IOCB again since open failed
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jsr fddecusage ; and decrement usage counter of fd
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lda tmp3 ; put error code into A
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jmp __mappederrno
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ok: lda tmp2 ; get fd
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ldx #0
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stx __oserror
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rts
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.endproc
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; closeallfiles: Close all files opened by the program.
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.proc closeallfiles
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lda #MAX_FD_INDEX-1
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loop: ldx #0
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pha
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jsr _close
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pla
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clc
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sbc #0
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bpl loop
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rts
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.endproc
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