gears/services/mpi/hcall.h

   1 #ifndef __HCALL__
   2 #define __HCALL__
   3
   4 /*
   5   Calling convention:
   6
   7 64 bit:
   8   rax = hcall number
   9   rbx = 0x6464646464646464...
  10   rcx = 1st arg
  11   rdx = 2nd arg
  12   rsi = 3rd arg
  13   rdi = 4th arg
  14   r8  = 5th arg
  15   r9  = 6th arg
  16   r10 = 7th arg
  17   r11 = 8th arg
  18
  19 32 bit:
  20   eax = hcall number
  21   ebx = 0x32323232
  22   arguments on stack in C order (first argument is TOS)
  23      arguments are also 32 bit
  24 */
  25 #define HCALL64(rc,id,a,b,c,d,e,f,g,h)                \
  26   asm volatile ("movq %1, %%rax; "                    \
  27                 "pushq %%rbx; "                       \
  28                 "movq $0x6464646464646464, %%rbx; "   \
  29                 "movq %2, %%rcx; "                    \
  30                 "movq %3, %%rdx; "                    \
  31                 "movq %4, %%rsi; "                    \
  32                 "movq %5, %%rdi; "                    \
  33                 "movq %6, %%r8 ; "                    \
  34                 "movq %7, %%r9 ; "                    \
  35                 "movq %8, %%r10; "                    \
  36                 "movq %9, %%r11; "                    \
  37                 "vmmcall ;       "                    \
  38                 "movq %%rax, %0; "                    \
  39                 "popq %%rbx; "                        \
  40                 : "=r"(rc)                            \
  41                 : "m"(id),                            \
  42                   "m"(a), "m"(b), "m"(c), "m"(d),     \
  43                   "m"(e), "m"(f), "m"(g), "m"(h)      \
  44                 : "%rax","%rcx","%rdx","%rsi","%rdi", \
  45                   "%r8","%r9","%r10","%r11"           \
  46                 )
  47
  48 #define HCALL32(rc,id,a,b,c,d,e,f,g,h)                \
  49   asm volatile ("movl %1, %%eax; "                    \
  50                 "pushl %%ebx; "                       \
  51                 "movl $0x32323232, %%ebx; "           \
  52                 "pushl %9;"                           \
  53                 "pushl %8;"                           \
  54                 "pushl %7;"                           \
  55                 "pushl %6;"                           \
  56                 "pushl %5;"                           \
  57                 "pushl %4;"                           \
  58                 "pushl %3;"                           \
  59                 "pushl %2;"                           \
  60                 "vmmcall ;       "                    \
  61                 "movl %%eax, %0; "                    \
  62                 "addl $32, %%esp; "                   \
  63                 "popl %%ebx; "                        \
  64                 : "=r"(rc)                            \
  65                 : "m"(id),                            \
  66                   "m"(a), "m"(b), "m"(c), "m"(d),     \
  67                 "m"(e), "m"(f), "m"(g), "m"(h)        \
  68                 : "%eax"                              \
  69                 )
  70
  71 #ifdef __x86_64__
  72 #define HCALL(rc,id,a,b,c,d,e,f,g,h)  HCALL64(rc,id,a,b,c,d,e,f,g,h)
  73 #else
  74 #define HCALL(rc,id,a,b,c,d,e,f,g,h)  HCALL32(rc,id,a,b,c,d,e,f,g,h)
  75 #endif
  76
  77 #endif