LXR linux/arch/sparc/kernel/sclow.S

   1/* sclow.S: Low level special syscall handling.
   2 *          Basically these are cases where we can completely
   3 *          handle the system call without saving any state
   4 *          because we know that the process will not sleep.
   5 *
   6 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   7 */
   8
   9#include <asm/ptrace.h>
  10#include <asm/asm-offsets.h>
  11#include <asm/errno.h>
  12#include <asm/winmacro.h>
  13#include <asm/thread_info.h>
  14#include <asm/psr.h>
  15#include <asm/page.h>
  16
  17#define CC_AND_RETT  \
  18        set     PSR_C, %l4; \
  19        andn    %l0, %l4, %l4; \
  20        wr      %l4, 0x0, %psr; \
  21        nop; nop; nop; \
  22        jmp     %l2; \
  23        rett    %l2 + 4;
  24
  25#define SC_AND_RETT  \
  26        set     PSR_C, %l4; \
  27        or      %l0, %l4, %l4; \
  28        wr      %l4, 0x0, %psr; \
  29        nop; nop; nop; \
  30        jmp     %l2; \
  31        rett    %l2 + 4;
  32
  33#define LABEL(func)  func##_low
  34
  35        .globl  LABEL(sunosnop)
  36LABEL(sunosnop):
  37        CC_AND_RETT
  38
  39#if (ASIZ_task_uid == 2 && ASIZ_task_euid == 2)
  40        .globl  LABEL(sunosgetuid)
  41LABEL(sunosgetuid):
  42        LOAD_CURRENT(l4, l5)
  43        ld      [%l4 + TI_TASK], %l4
  44        lduh    [%l4 + AOFF_task_uid], %i0
  45        lduh    [%l4 + AOFF_task_euid], %i1
  46        CC_AND_RETT
  47#endif
  48
  49#if (ASIZ_task_gid == 2 && ASIZ_task_egid == 2)
  50        .globl  LABEL(sunosgetgid)
  51LABEL(sunosgetgid):
  52        LOAD_CURRENT(l4, l5)
  53        ld      [%l4 + TI_TASK], %l4
  54        lduh    [%l4 + AOFF_task_gid], %i0
  55        lduh    [%l4 + AOFF_task_egid], %i1
  56        CC_AND_RETT
  57#endif
  58
  59        .globl  LABEL(sunosmctl)
  60LABEL(sunosmctl):
  61        mov     0, %i0
  62        CC_AND_RETT
  63
  64        .globl  LABEL(sunosgdtsize)
  65LABEL(sunosgdtsize):    
  66        mov     256, %i0
  67        CC_AND_RETT
  68
  69        .globl  LABEL(getpagesize)
  70LABEL(getpagesize):
  71        set     PAGE_SIZE, %i0
  72        CC_AND_RETT
  73
  74        /* XXX sys_nice() XXX */
  75        /* XXX sys_setpriority() XXX */
  76        /* XXX sys_getpriority() XXX */
  77        /* XXX sys_setregid() XXX */
  78        /* XXX sys_setgid() XXX */
  79        /* XXX sys_setreuid() XXX */
  80        /* XXX sys_setuid() XXX */
  81        /* XXX sys_setfsuid() XXX */
  82        /* XXX sys_setfsgid() XXX */
  83        /* XXX sys_setpgid() XXX */
  84        /* XXX sys_getpgid() XXX */
  85        /* XXX sys_setsid() XXX */
  86        /* XXX sys_getsid() XXX */
  87