28 lines
875 B
ArmAsm
28 lines
875 B
ArmAsm
.sect .text; .sect .rom; .sect .data; .sect .bss; .sect .text
|
|
.define .lpb
|
|
|
|
! $Header$
|
|
! special version to work with A68S, by CHL
|
|
! compute AB, given LB
|
|
.lpb:
|
|
cmpl r0,fp
|
|
bneq I1
|
|
moval 4(ap),r0
|
|
rsb
|
|
I1:
|
|
movl 4(r0),r1 ! mask for saved registers
|
|
addl2 $24,r0 ! position of AB if no registers saved
|
|
movl $16,r2 ! position of first bit to test
|
|
I2:
|
|
subl3 r2,$28,r3 ! remaining size of mask
|
|
ffs r2,r3,r1,r2 ! find first bit set in mask
|
|
beql I3 ! no more bits set
|
|
addl2 $4,r0 ! for each saved register
|
|
incl r2
|
|
jbr I2
|
|
I3:
|
|
extzv $30,$2,r1,r2 ! Now find out about the stack alignment
|
|
! between fp and ap
|
|
addl2 r2,r0 ! add alignment
|
|
rsb
|