Usermode/Libraries/ld-acess.so_src/arch/armv7.S.h

   1 //
   2 // Acess2 ARMv7 - System Calls
   3 //
   4
   5 #include "../../../../Kernel/include/syscalls.h"
   6
   7 .globl _start
   8 .extern SoMain
   9 _start:
  10         pop {r0}
  11         bl SoMain
  12
  13         mov r4, r0
  14
  15         pop {r0,r1,r2}
  16         blx r4
  17
  18         b _exit
  19
  20 @ Stupid GCC
  21 .globl __ucmpdi2
  22 __ucmpdi2:
  23         cmp r0, r2
  24         movmi r0, #0
  25         movmi pc, lr
  26         movhi r0, #2
  27         movhi pc, lr
  28         cmp r1, r2
  29         movmi r0, #0
  30         movmi pc, lr
  31         movhi r0, #2
  32         movhi pc, lr
  33         mov r0, #1
  34         mov pc, lr
  35
  36 @ Well, can't blame it
  37 @ - Clear the instruction cache
  38 .globl __clear_cache
  39 __clear_cache:
  40         svc #0x1001
  41         mov pc, lr
  42
  43 @ DEST
  44 @ SRC
  45 @_memcpy:
  46 @       push rbp
  47 @       mov rbp, rsp
  48 @
  49 @       ; RDI - First Param
  50 @       ; RSI - Second Param
  51 @       mov rcx, rdx    ; RDX - Third
  52 @       rep movsb
  53 @
  54 @       pop rbp
  55 @       ret
  56 @
  57 .globl _errno
  58 _errno: .long   0       @ Placed in .text, to allow use of relative addressing
  59
  60 .macro syscall0 _name, _num
  61 .globl \_name
  62 \_name:
  63         push {lr}
  64         svc #\_num
  65         str r2, _errno
  66         pop {pc}
  67 .endm
  68
  69 .macro syscall5 _name, _num
  70 .globl \_name
  71 \_name:
  72         push {r4, lr}
  73         ldr r4, [sp,#4]
  74         svc #\_num
  75         str r2, _errno
  76         pop {r4, pc}
  77 .endm
  78
  79 .macro syscall6 _name, _num
  80 .globl \_name
  81 \_name:
  82         push {r4,r5,lr}
  83         ldr r4, [sp,#8]
  84         ldr r5, [sp,#12]
  85         svc #\_num
  86         str r2, _errno
  87         pop {r4,r5,pc}
  88 .endm
  89
  90 #define SYSCALL0(_name,_num)    syscall0 _name, _num
  91 #define SYSCALL1(_name,_num)    SYSCALL0(_name, _num)
  92 #define SYSCALL2(_name,_num)    SYSCALL0(_name, _num)
  93 #define SYSCALL3(_name,_num)    SYSCALL0(_name, _num)
  94 #define SYSCALL4(_name,_num)    SYSCALL0(_name, _num)
  95 // TODO: 5/6 need special handling, because the args are on the stack
  96 #define SYSCALL5(_name,_num)    syscall5 _name, _num
  97 #define SYSCALL6(_name,_num)    syscall6 _name, _num
  98
  99 // Override the clone syscall
 100 #define _exit   _exit_raw
 101 #define _clone  _clone_raw
 102 #include "syscalls.s.h"
 103 #undef _exit
 104 #undef _clone
 105
 106 .globl _clone
 107 _clone:
 108         push {r4}
 109         mov r4, r1
 110         svc #SYS_CLONE
 111         str r2, _errno
 112         tst r4, r4
 113         beq _clone_ret
 114         @ If in child, set SP
 115         tst r0,r0
 116         movne sp, r4
 117 _clone_ret:
 118         pop {r4}
 119         mov pc, lr
 120
 121 .globl _exit
 122 _exit:
 123         svc #0
 124         b .
 125