64 lines
1.5 KiB
ArmAsm
64 lines
1.5 KiB
ArmAsm
|
.define ___Get_PC, ___Set_PC, ___u_LiB
|
||
|
|
.sect .text; .sect .rom; .sect .data
|
||
|
|
|
||
|
|
! $Header$
|
||
|
|
|
||
|
|
! This is the machine-dependant part of the ACK debugger support.
|
||
|
|
! ___Get_PC takes a frame pointer (local base) argument and returns the
|
||
|
|
! return address from this frame.
|
||
|
|
! ___Set_PC takes a frame pointer (local base) argument plus a return
|
||
|
|
! address and sets the return address of this frame to the
|
||
|
|
! return address supplied.
|
||
|
|
! ___u_LiB saves the scratch registers and then calls ___uX_LiB;
|
||
|
|
! when ___uX_LiB returns, the scratch registers are restored.
|
||
|
|
! ___u_LiB is the solution chosen for the MC68020 back-end.
|
||
|
|
! Other back-ends could choose different solutions.
|
||
|
|
|
||
|
|
! The local base of ___uX_LiB is kind of special: because of ___u_LiB,
|
||
|
|
! the "interesting" return address of this particular stack-frame is found
|
||
|
|
! in a different place than the one of a normal stack-frame:
|
||
|
|
! the "interesting" return address is in fact the return address of
|
||
|
|
! ___u_LiB. Therefore, we save the local base of ___uX_LiB in sv_a6.
|
||
|
|
|
||
|
|
.sect .data
|
||
|
|
sv_a6:
|
||
|
|
.data4 0
|
||
|
|
|
||
|
|
.sect .text
|
||
|
|
___Get_PC:
|
||
|
|
move.l (4,sp),d0
|
||
|
|
beq 1f
|
||
|
|
move.l d0,a0
|
||
|
|
cmp.l (sv_a6),d0
|
||
|
|
beq 2f
|
||
|
|
move.l (4,a0),d0
|
||
|
|
1:
|
||
|
|
rts
|
||
|
|
2:
|
||
|
|
move.l (32,a0),d0
|
||
|
|
rts
|
||
|
|
|
||
|
|
___Set_PC:
|
||
|
|
move.l (4,sp),d0
|
||
|
|
beq 1f
|
||
|
|
move.l d0,a0
|
||
|
|
cmp.l (sv_a6),d0
|
||
|
|
beq 2f
|
||
|
|
move.l (8,sp),(4,a0)
|
||
|
|
1:
|
||
|
|
rts
|
||
|
|
2:
|
||
|
|
move.l (8,sp),(32,a0)
|
||
|
|
rts
|
||
|
|
|
||
|
|
___u_LiB:
|
||
|
|
movem.l d0/d1/d2/a0/a1,-(sp)
|
||
|
|
move.l (sv_a6),-(sp)
|
||
|
|
move.l sp,d0
|
||
|
|
sub.l #8,d0
|
||
|
|
move.l d0,(sv_a6) ! this is the LB of __uX_LiB
|
||
|
|
jsr (___uX_LiB)
|
||
|
|
move.l (sp)+,(sv_a6)
|
||
|
|
movem.l (sp)+,d0/d1/d2/a0/a1
|
||
|
|
rts
|