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