arch/i386-pc/exec/userstate.s

   1 #include <aros/i386/asm.h>
   2
   3         .text
   4         .align  16
   5
   6         .globl  cpu_SuperState
   7         .type   cpu_SuperState, @function
   8
   9         // This is a SuperState() helper. It's called via Supervisor().
  10         // Its job is to restore a stack pointer and return to user's code.
  11 cpu_SuperState:
  12         movl    %esp, %eax              // return int handler stack
  13         movl    12(%eax),%esp           // use user stack
  14         pushl   (%eax)                  // push return address
  15         ret                             // return from SuperState() call
  16
  17         .size  cpu_SuperState, .-cpu_SuperState
  18
  19         .globl  AROS_SLIB_ENTRY(UserState, Exec, 26)
  20         .type   AROS_SLIB_ENTRY(UserState, Exec, 26), @function
  21
  22 AROS_SLIB_ENTRY(UserState, Exec, 26):
  23         popl    %ecx                    // Get return address
  24         movl    (%esp), %eax            // Get supervisor return stack
  25         movl    %ecx, (%eax)            // Set return address
  26         movl    %esp, 12(%eax)          // Set USP in exception stack frame
  27         movl    %eax, %esp              // SSP = SP
  28         iret                            // Exit from interrupt
  29
  30         .size  AROS_SLIB_ENTRY(UserState, Exec, 26), .-AROS_SLIB_ENTRY(UserState, Exec, 26)