src/org/ibex/nestedvm/support.s

   1 #include "syscalls.h"
   2
   3 #define zero $0
   4 #define v0 $2
   5 #define v1 $3
   6 #define a0 $4
   7 #define a1 $5
   8 #define a2 $6
   9 #define a3 $7
  10 #define t0 $8
  11 #define t1 $9
  12 #define ra $31
  13
  14 /* We intentionally don't take advantage of delay slots because
  15    the compiler removes them anyway */
  16
  17 .set noreorder;
  18
  19 #define SYSCALL(name) SYSCALL2(name,SYS_##name)
  20 #define SYSCALL2(name,number)  \
  21     .section .text.name,"ax",@progbits; \
  22     .align 2;       \
  23     .globl name;    \
  24     .ent name;      \
  25 name:               \
  26     li v0, number;  \
  27     syscall;        \
  28     j ra;           \
  29     nop;            \
  30     .end name;
  31
  32 #define SYSCALL_R(name)        \
  33     .section .text._##name##_r,"ax",@progbits; \
  34     .align 2;                  \
  35     .globl _##name##_r;        \
  36     .ent _##name##_r;          \
  37 _##name##_r:                   \
  38     li v0, SYS_##name;         \
  39     move t0, a0;               \
  40     move a0, a1;               \
  41     move a1, a2;               \
  42     move a2, a3;               \
  43     syscall;                   \
  44     addu t1,v0,255;            \
  45     sltu t1,t1,255;            \
  46     bne t1,zero,$L##name##_errno;\
  47     nop;                       \
  48     j ra;                      \
  49     nop;                       \
  50 $L##name##_errno:              \
  51     move a0, t0;               \
  52     move a1, v0;               \
  53     j _syscall_set_errno;      \
  54     nop;                       \
  55     .end _##name##_r;
  56
  57
  58     .align   2
  59     .globl   _call_helper
  60     .ent     _call_helper
  61 _call_helper:
  62     subu $sp,$sp,32
  63
  64     /* addr */
  65     move $2,$4
  66
  67     /* args 1-4 */
  68     move $4,$5
  69     move $5,$6
  70     move $6,$7
  71     move $7,$16
  72
  73     /* args 5 and 6 */
  74     sw $17,16($sp)
  75     sw $18,20($sp)
  76
  77     /* call the func */
  78     jal $31,$2
  79     nop
  80
  81     move $3,$2
  82     li $2,SYS_pause
  83     syscall
  84
  85     /* shouldn't get here */
  86     li $2,SYS_exit
  87     li $3,1
  88     syscall
  89
  90     .end _call_helper
  91
  92 SYSCALL2(_exit,SYS_exit)
  93 SYSCALL2(_pause,SYS_pause)
  94 SYSCALL_R(open)
  95 SYSCALL_R(close)
  96 SYSCALL_R(read)
  97 SYSCALL_R(write)
  98 SYSCALL_R(sbrk)
  99 SYSCALL_R(fstat)
 100 SYSCALL(isatty)
 101 SYSCALL_R(lseek)
 102 SYSCALL_R(kill)
 103 SYSCALL_R(getpid)
 104 SYSCALL2(_call_java,SYS_calljava)
 105 SYSCALL_R(stat)
 106 SYSCALL_R(gettimeofday)
 107 SYSCALL(sleep)
 108 SYSCALL_R(times)
 109 SYSCALL_R(mkdir)
 110 SYSCALL(getpagesize)
 111 SYSCALL_R(unlink)
 112 SYSCALL_R(utime)
 113 SYSCALL_R(chdir)
 114 SYSCALL_R(pipe)
 115 SYSCALL_R(dup2)
 116 SYSCALL_R(fork)
 117 SYSCALL_R(waitpid)
 118 SYSCALL_R(getcwd)
 119 SYSCALL_R(execve)
 120 SYSCALL_R(fcntl)
 121 SYSCALL_R(rmdir)
 122 SYSCALL_R(sysconf)