libpcsxcore/ppc/pasm.s

   1
   2
   3 #define OLD_REGISTER_OFFSET     (19*4)
   4 #define SP_SIZE                 (OLD_REGISTER_OFFSET+4+8)
   5
   6 /*asm void recRun(register void (*func)(), register u32 hw1, register u32 hw2)*/
   7         .text
   8         .align  4
   9         .globl  recRun
  10 recRun:
  11         /* prologue code */
  12         mflr    r0
  13         stmw    r13, -(32-13)*4(r1)
  14         stw             r0, 4(r1)
  15         stwu    r1, -((32-13)*4+8)(r1)
  16
  17         /* execute code */
  18         mtctr   r3
  19         mr      r31, r4
  20         mr      r30, r5
  21         bctrl
  22 /*
  23 }
  24 asm void returnPC()
  25 {*/
  26         .text
  27         .align  4
  28         .globl  returnPC
  29 returnPC:
  30         // end code
  31         lwz             r0, (32-13)*4+8+4(r1)
  32         addi    r1, r1, (32-13)*4+8
  33         mtlr    r0
  34         lmw             r13, -(32-13)*4(r1)
  35         blr
  36 //}*/
  37
  38 // Memory functions that only works with a linear memory
  39
  40         .text
  41         .align  4
  42         .globl  dynMemRead8
  43 dynMemRead8:
  44 // assumes that memory pointer is in r30
  45         addis    r2,r3,-0x1f80
  46         srwi.     r4,r2,16
  47         bne+     .norm8
  48         cmplwi   r2,0x1000
  49         blt-     .norm8
  50         b        psxHwRead8
  51 .norm8:
  52         clrlwi   r5,r3,3
  53         lbzx     r3,r5,r30
  54         blr
  55
  56         .text
  57         .align  4
  58         .globl  dynMemRead16
  59 dynMemRead16:
  60 // assumes that memory pointer is in r30
  61         addis    r2,r3,-0x1f80
  62         srwi.     r4,r2,16
  63         bne+     .norm16
  64         cmplwi   r2,0x1000
  65         blt-     .norm16
  66         b        psxHwRead16
  67 .norm16:
  68         clrlwi   r5,r3,3
  69         lhbrx    r3,r5,r30
  70         blr
  71
  72         .text
  73         .align  4
  74         .globl  dynMemRead32
  75 dynMemRead32:
  76 // assumes that memory pointer is in r30
  77         addis    r2,r3,-0x1f80
  78         srwi.     r4,r2,16
  79         bne+     .norm32
  80         cmplwi   r2,0x1000
  81         blt-     .norm32
  82         b        psxHwRead32
  83 .norm32:
  84         clrlwi   r5,r3,3
  85         lwbrx    r3,r5,r30
  86         blr
  87
  88 /*
  89         N P Z
  90         0 0 0 X
  91 -       0 0 1 X
  92         1 0 0 X
  93         1 0 1 X
  94
  95 P | (!N & Z)
  96 P | !(N | !Z)
  97 */
  98
  99         .text
 100         .align  4
 101         .globl  dynMemWrite32
 102 dynMemWrite32:
 103 // assumes that memory pointer is in r30
 104         addis    r2,r3,-0x1f80
 105         srwi.    r5,r2,16
 106         bne+     .normw32
 107         cmplwi   r2,0x1000
 108         blt      .normw32
 109         b        psxHwWrite32
 110 .normw32:
 111         mtcrf    0xFF, r3
 112         clrlwi   r5,r3,3
 113         crandc   0, 2, 0
 114         cror     2, 1, 0
 115         bne+     .okw32
 116         // write test
 117         li                      r2,0x0130
 118         addis    r2,r2,0xfffe
 119         cmplw    r3,r2
 120         bnelr
 121 .okw32:
 122         stwbrx   r4,r5,r30
 123         blr
 124