mirror of https://github.com/cc65/cc65.git
70 lines
1.8 KiB
ArmAsm
70 lines
1.8 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 2003-08-12
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;
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; This module contains a utility function for the machine dependent parts
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; of uname (__sysuname): It copies a packed struct utsname (just the strings
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; without padding) into a struct utsname. The source of the data is an
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; external symbol named "utsdata", the target is passed in a/x.
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; The function is written so that it is a direct replacement for __sysuname
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; for systems where utsdata is fixed. It may also be called via jump or
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; subroutine on systems where utsdata must be changed at runtime.
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;
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.export utscopy
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.import utsdata
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.importzp ptr1, tmp1
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.include "utsname.inc"
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;--------------------------------------------------------------------------
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; Data.
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.rodata
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; Table with offsets into struct utsname
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fieldoffs:
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.byte utsname::sysname
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.byte utsname::nodename
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.byte utsname::release
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.byte utsname::version
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.byte utsname::machine
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fieldcount = * - fieldoffs
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;--------------------------------------------------------------------------
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.code
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.proc utscopy
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sta ptr1
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stx ptr1+1 ; Save buf
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ldx #0
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stx tmp1 ; Field number
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next: ldy tmp1
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cpy #fieldcount
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beq done
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inc tmp1 ; Bump field counter
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lda fieldoffs,y ; Get next field offset
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tay ; Field offset -> y
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loop: lda utsdata,x
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sta (ptr1),y
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inx ; Next char in utsdata
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cmp #$00 ; Check for end of string
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beq next ; Jump for next field
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iny ; Next char in utsname struct
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bne loop ; Copy string
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done: lda #$00 ; Always successful
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rts
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.endproc
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