arch/.unmaintained/ppc-native/macros.s

   1 # remap PPC registers to meaningful names
   2 .set r1 ,sp
   3 # the "a6" register
   4 .set r2, base
   5 # int return value register
   6 .set r3, ret
   7 # function arguments
   8 .set r3, arg0
   9 .set r4, arg1
  10 .set r5, arg2
  11 .set r6, arg3
  12 .set r7, arg4
  13 .set r8, arg5
  14 .set r9, arg6
  15 .set r10,arg7
  16 # "scratch" register
  17 .set r30,scr
  18
  19 # jsrlvo macro(offset,base)
  20 .macro jsrlvo
  21         push    scr
  22         lwz     scr,_LVO\1+4(\2)
  23         mtlr    scr
  24         pop     scr
  25         blrl
  26 .endm
  27
  28 # very long jump macro
  29 .macro ljmp
  30        push     scr
  31        addis    scr,0,\1@h
  32        ori      scr,scr,\1@l
  33        mtlr     scr
  34        pop      scr
  35        blr
  36 .endm
  37
  38 # stack macros
  39 .macro pop
  40         lwz     \1,0(sp)
  41         add     sp,sp,4
  42 .endm
  43
  44 .macro push
  45         stwu    \1,-4(sp)
  46 .endm
  47
  48 # subroutine macros
  49 .macro subr
  50     push    scr
  51     mflr    scr
  52     push    scr
  53 .endm
  54
  55 .macro rts
  56     pop    scr
  57     mtlr   scr
  58     pop    scr
  59     blr
  60 .endm
  61
  62 # return from supervisor. _Super_ret_addr will point to a global address
  63 # in the area of exception handler.
  64 .macro rfs
  65         # recall return address
  66         pop     scr
  67         # push it to srr0, so we can rfi
  68         mtsrr0  scr
  69         # recall scr, which is put on the stack in the beginning of Supervisor()
  70         isync
  71         pop     scr
  72         sync
  73         # return to user context
  74         rfi
  75 .endm
  76
  77 # btst.x macros
  78 .macro btstb
  79         push    scr
  80         lbz     scr,0(\2)
  81         rlwinm. r0,scr,31-\1,0,0
  82         pop     scr
  83 .endm
  84
  85 .macro btstw
  86         push    scr
  87         lhz     scr,0(\2)
  88         rlwinm. r0,scr,31-\1,0,0
  89         pop     scr
  90 .endm
  91
  92 .macro btstl
  93         push    scr
  94         lwz     scr,(\2)
  95         rlwinm. r0,scr,31-\1,0,0
  96         pop     scr
  97 .endm
  98
  99 # context save/restore macros
 100 .macro pusha
 101         push    r0
 102         push    r1
 103         push    r2
 104         push    r3
 105         push    r4
 106         push    r5
 107         push    r6
 108         push    r7
 109         push    r8
 110         push    r9
 111         push    r10
 112         push    r11
 113         push    r12
 114         push    r13
 115         push    r14
 116         push    r15
 117         push    r16
 118         push    r17
 119         push    r18
 120         push    r19
 121         push    r20
 122         push    r21
 123         push    r22
 124         push    r23
 125         push    r24
 126         push    r25
 127         push    r26
 128         push    r27
 129         push    r28
 130         push    r29
 131         push    r30
 132         push    r31
 133
 134         mflr    r0
 135         push    r0
 136         mfcr    r0
 137         push    r0
 138 .endm
 139
 140 .macro popa
 141         pop     r0
 142         mtcr    r0
 143         pop     r0
 144         mtlr    r0
 145         pop     r31
 146         pop     r30
 147         pop     r29
 148         pop     r28
 149         pop     r27
 150         pop     r26
 151         pop     r25
 152         pop     r24
 153         pop     r23
 154         pop     r22
 155         pop     r21
 156         pop     r20
 157         pop     r19
 158         pop     r18
 159         pop     r17
 160         pop     r16
 161         pop     r15
 162         pop     r14
 163         pop     r13
 164         pop     r12
 165         pop     r11
 166         pop     r10
 167         pop     r9
 168         pop     r8
 169         pop     r7
 170         pop     r6
 171         pop     r5
 172         pop     r4
 173         pop     r3
 174         pop     r2
 175         pop     r1
 176         pop     r0
 177 .endm