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Fix the Linux/m68k target #370

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Merged
davidgiven merged 1 commit into from
Jul 16, 2026
Merged

Fix the Linux/m68k target #370

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45 changes: 23 additions & 22 deletions plat/linux68k/boot.s
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
#
! $Source: /cvsroot/tack/Ack/plat/linux386/boot.s,v $
! $Source: /cvsroot/tack/Ack/plat/linux68k/boot.s,v $
! $State: Exp $
! $Revision: 1.3 $
! $Revision: 1.4 $

! Declare segments (the order is important).

Expand All @@ -18,30 +18,31 @@ begtext:
!
! On entry, the stack looks like this:
!
! sp+.. NULL
! sp+8+(4*argc) env (X quads)
! sp+8+(4*argc) envp[0] ...
! sp+4+(4*argc) NULL
! sp+4 argv (argc quads)
! sp+4 argv[0] ... argv[argc-1]
! sp argc
!
! The ACK actually expects:
!
! sp+8 argc
! sp+4 argv
! sp env
! _main parameters are:
! argc (word), argv (pointer), envp (pointer)
! sp+12 envp
! sp+8 argv
! sp+4 argc
! sp return

move.l (0, sp), d0 ! d0 = argc
lea (4, sp), a0 ! a0 = argv

move.l d0, d1
asl.l #2, d1 ! d1 = argc*4
add.l a0, d1 ! d1 = &argv[argc]
add.l #4, d1 ! d1 = envp

move.l d1, -(sp) ! envp
move.l a0, -(sp) ! argv
move.l d0, -(sp) ! argc
pea (0) ! return

move.l (0, sp), d0 ! d0 = argc
move.l (4, sp), d1 ! d1 = argv
move.l d0, d2
asl.l #2, d2
move.l (sp, d2), d2
add.l #12, d2 ! d2 = environ

move.l d2, -(sp) ! environ
move.l d0, -(sp) ! argc
move.l d1, -(sp) ! argv
pea (0) ! dummy, representing the return address

jmp (__m_a_i_n)

! This provides an emergency exit routine used by EM.
Expand Down
25 changes: 15 additions & 10 deletions plat/linux68k/libsys/_syscall.s
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
#
! $Source: /cvsroot/tack/Ack/plat/linux386/libsys/_syscall.s,v $
! $Source: /cvsroot/tack/Ack/plat/linux68k/libsys/_syscall.s,v $
! $State: Exp $
! $Revision: 1.1 $
! $Revision: 1.2 $

! Declare segments (the order is important).

Expand All @@ -13,21 +13,26 @@
.sect .text

EINVAL = 22

! Perform a Linux system call.

.define __syscall
__syscall:
move.l (4, sp), d0
move.l (8, sp), d1
move.l (12, sp), d2
move.l (16, sp), d3
move.l d2, -(sp)
move.l d3, -(sp)
! Stack: (0)saved d3, (4)saved d2, (8)ret, (12)op, (16)p1, (20)p2, (24)p3
move.l (12, sp), d0
move.l (16, sp), d1
move.l (20, sp), d2
move.l (24, sp), d3
trap #0

move.l (sp)+, d3
move.l (sp)+, d2

tst.l d0
bmi 1f
rts

1:
neg.l d0
! It just so happens that errnos 1-34 are the same in Linux as in ACK.
Expand All @@ -39,7 +44,7 @@ __syscall:
3:
move.l #-1, d0
rts

2:
move.l #EINVAL, (_errno)
bra 3b
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