reactos/dll/opengl/mesa/src/mesa/x86-64/calling_convention.txt

   1 Register Usage
   2 rax      temporary register; with variable arguments passes information
   3          about the number of SSE registers used; 1st return register
   4
   5 rbx*     callee-saved register; optionally used as base pointer
   6
   7 rcx      used to pass 4th integer argument to functions
   8
   9 rdx      used to pass 3rd argument to functions 2nd return register
  10
  11 rsp*     stack pointer
  12
  13 rbp*     callee-saved register; optionally used as frame pointer
  14
  15 rsi      used to pass 2nd argument to functions
  16
  17 rdi      used to pass 1st argument to functions
  18
  19 r8       used to pass 5th argument to functions
  20
  21 r9       used to pass 6th argument to functions
  22
  23 r10      temporary register, used for passing a function's static chain pointer
  24
  25 r11      temporary register
  26
  27 r12-15*  callee-saved registers
  28
  29 xmm01   used to pass and return floating point arguments
  30
  31 xmm27   used to pass floating point arguments
  32
  33 xmm815  temporary registers
  34
  35 mmx07   temporary registers
  36
  37 st0      temporary register; used to return long double arguments
  38
  39 st1      temporary registers; used to return long double arguments
  40
  41 st27    temporary registers
  42
  43 fs       Reserved for system use (as thread specific data register)
  44
  45
  46
  47 *) must be preserved across function calls
  48
  49 Integer arguments from list: rdi,rsi,rdx,rcx,r8,r9,stack
  50 Floating point arguments from list: xmm0-xmm7