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/* sclow.S: Low level special syscall handling.
* Basically these are cases where we can completely
* handle the system call without saving any state
* because we know that the process will not sleep.
*
* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
*/
#include <asm/cprefix.h>
#include <asm/ptrace.h>
#include <asm/errno.h>
#include <asm/winmacro.h>
#include <asm/psr.h>
#define CC_AND_RETT \
set PSR_C, %l4; \
andn %l0, %l4, %l4; \
wr %l4, 0x0, %psr; \
nop; nop; nop; \
jmp %l2; \
rett %l2 + 4;
#define SC_AND_RETT \
set PSR_C, %l4; \
or %l0, %l4, %l4; \
wr %l4, 0x0, %psr; \
nop; nop; nop; \
jmp %l2; \
rett %l2 + 4;
#define LABEL(func) CONCAT(func, _low)
.globl LABEL(sunosnop)
LABEL(sunosnop):
CC_AND_RETT
.globl LABEL(sunosgetpid)
LABEL(sunosgetpid):
LOAD_CURRENT(l4, l5)
ld [%l4 + 108], %i0
ld [%l4 + 256], %l5
ld [%l5 + 108], %i1
CC_AND_RETT
.globl LABEL(sunosgetuid)
LABEL(sunosgetuid):
LOAD_CURRENT(l4, l5)
lduh [%l4 + 280], %i0
lduh [%l4 + 282], %i1
CC_AND_RETT
.globl LABEL(sunosgetgid)
LABEL(sunosgetgid):
LOAD_CURRENT(l4, l5)
lduh [%l4 + 288], %i0
lduh [%l4 + 290], %i1
CC_AND_RETT
.globl LABEL(sunosmctl)
LABEL(sunosmctl):
mov 0, %i0
CC_AND_RETT
.globl LABEL(sunosgdtsize)
LABEL(sunosgdtsize):
mov 256, %i0
CC_AND_RETT
.globl LABEL(sunossblock)
LABEL(sunossblock):
LOAD_CURRENT(l4, l5)
set -65793, %l5
and %i0, %l5, %l5
ld [%l4 + TASK_BLOCKED], %i0
or %i0, %l5, %l5
st %l5, [%l4 + TASK_BLOCKED]
CC_AND_RETT
.globl LABEL(sunossmask)
LABEL(sunossmask):
LOAD_CURRENT(l4, l5)
set -65793, %l5
and %i0, %l5, %l5
ld [%l4 + TASK_BLOCKED], %i0
st %l5, [%l4 + TASK_BLOCKED]
CC_AND_RETT
.globl LABEL(getpagesize)
LABEL(getpagesize):
set 4096, %i0
CC_AND_RETT
.globl LABEL(umask)
LABEL(umask):
LOAD_CURRENT(l4, l5)
ld [%l4 + 1560], %l5
and %i0, 511, %l4
lduh [%l5 + 4], %i0
sth %l4, [%l5 + 4]
CC_AND_RETT
.globl LABEL(write)
LABEL(write):
cmp %i0, 255 /* fd >= NR_OPEN */
bgu,a write_error_return
mov EBADF, %i0
LOAD_CURRENT(l4, l5)
ld [%l4 + 1564], %l5
sll %i0, 2, %l6
add %l5, %l6, %l5
ld [%l5 + 36], %l6
cmp %l6, 0 /* !(file=current->files->fd[fd]) */
be,a write_error_return
mov EBADF, %i0
ld [%l6 + 36], %l5
cmp %l5, 0 /* !(inode=file->f_inode) */
be,a write_error_return
mov EBADF, %i0
lduh [%l6], %l5 /* !(file->f_mode & 2) */
andcc %l5, 2, %g0
be,a write_error_return
mov EBADF, %i0
ld [%l6 + 40], %l5
cmp %l5, 0 /* !file->f_op */
be,a write_error_return
mov EINVAL, %i0
ld [%l5 + 8], %l5 /* !file->f_op->write */
cmp %l5, 0
be,a write_error_return
mov EINVAL, %i0
cmp %i2, 0 /* count == 0 */
bne 1f
nop
mov 0, %i0
CC_AND_RETT
1:
/* See if we can do the optimization... */
ld [%l6 + 36], %l5
lduh [%l5 + 16], %l5
srl %l5, 8, %l6
cmp %l6, 1 /* MEM_MAJOR */
bne,a write_is_too_hard
sethi %hi(C_LABEL(quick_sys_write)), %l7
and %l5, 0xff, %l5
cmp %l5, 3 /* NULL_MINOR */
bne,a write_is_too_hard
sethi %hi(C_LABEL(quick_sys_write)), %l7
/* We only optimize for the /dev/null case currently,
* however to stay POSIX4 compliant we must check the
* validity of the passed buffer. Blowlaris2.x does not
* do this and is therefore not POSIX4 compliant!
* If you are going to optimize for benchmarks, fine,
* but to break behavior of a system call in the process
* is complete brain damage...
*/
/* XXX write verify_area thingy for full POSIX conformance! XXX */
mov %i2, %i0
CC_AND_RETT
write_is_too_hard:
b syscall_is_too_hard
or %l7, %lo(C_LABEL(quick_sys_write)), %l7
write_error_return:
SC_AND_RETT
/* XXX sys_nice() XXX */
/* XXX sys_setpriority() XXX */
/* XXX sys_getpriority() XXX */
/* XXX sys_setregid() XXX */
/* XXX sys_setgid() XXX */
/* XXX sys_setreuid() XXX */
/* XXX sys_setuid() XXX */
/* XXX sys_setfsuid() XXX */
/* XXX sys_setfsgid() XXX */
/* XXX sys_setpgid() XXX */
/* XXX sys_getpgid() XXX */
/* XXX sys_setsid() XXX */
/* XXX sys_getsid() XXX */
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