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         ldm sp, {r1,r2,r3}
  12         bl SoMain
  13
  14         mov r4, r0
  15
  16         pop {r0,r1,r2}
  17         blx r4
  18
  19         b _exit
  20
  21 @ Stupid GCC
  22 .globl __ucmpdi2
  23 __ucmpdi2:
  24         cmp r0, r2
  25         movmi r0, #0
  26         movmi pc, lr
  27         movhi r0, #2
  28         movhi pc, lr
  29         cmp r1, r2
  30         movmi r0, #0
  31         movmi pc, lr
  32         movhi r0, #2
  33         movhi pc, lr
  34         mov r0, #1
  35         mov pc, lr
  36
  37 @ Well, can't blame it
  38 @ - Clear the instruction cache
  39 .globl __clear_cache
  40 __clear_cache:
  41         svc #0x1001
  42         mov pc, lr
  43
  44 @ DEST
  45 @ SRC
  46 @_memcpy:
  47 @       push rbp
  48 @       mov rbp, rsp
  49 @
  50 @       ; RDI - First Param
  51 @       ; RSI - Second Param
  52 @       mov rcx, rdx    ; RDX - Third
  53 @       rep movsb
  54 @
  55 @       pop rbp
  56 @       ret
  57 @
  58 .globl _errno
  59 _errno: .long   0       @ Placed in .text, to allow use of relative addressing
  60
  61 .macro syscall0 _name, _num
  62 .globl \_name
  63 \_name:
  64         push {lr}
  65         svc #\_num
  66         str r2, _errno
  67         pop {pc}
  68 .endm
  69
  70 .macro syscall5 _name, _num
  71 .globl \_name
  72 \_name:
  73         push {r4, lr}
  74         ldr r4, [sp,#4]
  75         svc #\_num
  76         str r2, _errno
  77         pop {r4, pc}
  78 .endm
  79
  80 .macro syscall6 _name, _num
  81 .globl \_name
  82 \_name:
  83         push {r4,r5,lr}
  84         ldr r4, [sp,#8]
  85         ldr r5, [sp,#12]
  86         svc #\_num
  87         str r2, _errno
  88         pop {r4,r5,pc}
  89 .endm
  90
  91 #define SYSCALL0(_name,_num)    syscall0 _name, _num
  92 #define SYSCALL1(_name,_num)    SYSCALL0(_name, _num)
  93 #define SYSCALL2(_name,_num)    SYSCALL0(_name, _num)
  94 #define SYSCALL3(_name,_num)    SYSCALL0(_name, _num)
  95 #define SYSCALL4(_name,_num)    SYSCALL0(_name, _num)
  96 // TODO: 5/6 need special handling, because the args are on the stack
  97 #define SYSCALL5(_name,_num)    syscall5 _name, _num
  98 #define SYSCALL6(_name,_num)    syscall6 _name, _num
  99
 100 // Override the clone syscall
 101 #define _exit   _exit_raw
 102 #define _clone  _clone_raw
 103 #include "syscalls.s.h"
 104 #undef _exit
 105 #undef _clone
 106
 107 .globl _clone
 108 _clone:
 109         push {r4}
 110         mov r4, r1
 111         svc #SYS_CLONE
 112         str r2, _errno
 113         tst r4, r4
 114         beq _clone_ret
 115         @ If in child, set SP
 116         tst r0,r0
 117         movne sp, r4
 118 _clone_ret:
 119         pop {r4}
 120         mov pc, lr
 121
 122 .globl _exit
 123 _exit:
 124         svc #0
 125         b .
 126