forked from Minki/linux
108 lines
3.6 KiB
ArmAsm
108 lines
3.6 KiB
ArmAsm
/*
|
|
*
|
|
* Linux/PARISC Project (http://www.parisc-linux.org/)
|
|
*
|
|
* System call entry code Copyright (c) Matthew Wilcox 1999 <willy@bofh.ai>
|
|
* Licensed under the GNU GPL.
|
|
* thanks to Philipp Rumpf, Mike Shaver and various others
|
|
* sorry about the wall, puffin..
|
|
*/
|
|
|
|
#include <asm/assembly.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/unistd.h>
|
|
#include <asm/errno.h>
|
|
#include <linux/linkage.h>
|
|
|
|
.level LEVEL
|
|
.text
|
|
|
|
.import hpux_call_table
|
|
.import hpux_syscall_exit,code
|
|
|
|
.align PAGE_SIZE
|
|
ENTRY(hpux_gateway_page)
|
|
nop
|
|
#ifdef CONFIG_64BIT
|
|
#warning NEEDS WORK for 64-bit
|
|
#endif
|
|
ldw -64(%r30), %r29 ;! 8th argument
|
|
ldw -60(%r30), %r19 ;! 7th argument
|
|
ldw -56(%r30), %r20 ;! 6th argument
|
|
ldw -52(%r30), %r21 ;! 5th argument
|
|
gate .+8, %r0 /* become privileged */
|
|
mtsp %r0,%sr4 /* get kernel space into sr4 */
|
|
mtsp %r0,%sr5 /* get kernel space into sr5 */
|
|
mtsp %r0,%sr6 /* get kernel space into sr6 */
|
|
mfsp %sr7,%r1 /* save user sr7 */
|
|
mtsp %r1,%sr3 /* and store it in sr3 */
|
|
|
|
mtctl %r30,%cr28
|
|
mfctl %cr30,%r1
|
|
xor %r1,%r30,%r30 /* ye olde xor trick */
|
|
xor %r1,%r30,%r1
|
|
xor %r1,%r30,%r30
|
|
ldo TASK_SZ_ALGN+FRAME_SIZE(%r30),%r30 /* set up kernel stack */
|
|
|
|
/* N.B.: It is critical that we don't set sr7 to 0 until r30
|
|
* contains a valid kernel stack pointer. It is also
|
|
* critical that we don't start using the kernel stack
|
|
* until after sr7 has been set to 0.
|
|
*/
|
|
|
|
mtsp %r0,%sr7 /* get kernel space into sr7 */
|
|
STREG %r1,TASK_PT_GR30-TASK_SZ_ALGN-FRAME_SIZE(%r30) /* save usp */
|
|
ldo -TASK_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr in %r1 */
|
|
|
|
/* Save some registers for sigcontext and potential task
|
|
switch (see entry.S for the details of which ones are
|
|
saved/restored). TASK_PT_PSW is zeroed so we can see whether
|
|
a process is on a syscall or not. For an interrupt the real
|
|
PSW value is stored. This is needed for gdb and sys_ptrace. */
|
|
STREG %r0, TASK_PT_PSW(%r1)
|
|
STREG %r2, TASK_PT_GR2(%r1) /* preserve rp */
|
|
STREG %r19, TASK_PT_GR19(%r1) /* 7th argument */
|
|
STREG %r20, TASK_PT_GR20(%r1) /* 6th argument */
|
|
STREG %r21, TASK_PT_GR21(%r1) /* 5th argument */
|
|
STREG %r22, TASK_PT_GR22(%r1) /* syscall # */
|
|
STREG %r23, TASK_PT_GR23(%r1) /* 4th argument */
|
|
STREG %r24, TASK_PT_GR24(%r1) /* 3rd argument */
|
|
STREG %r25, TASK_PT_GR25(%r1) /* 2nd argument */
|
|
STREG %r26, TASK_PT_GR26(%r1) /* 1st argument */
|
|
STREG %r27, TASK_PT_GR27(%r1) /* user dp */
|
|
STREG %r28, TASK_PT_GR28(%r1) /* return value 0 */
|
|
STREG %r28, TASK_PT_ORIG_R28(%r1) /* return value 0 (saved for signals) */
|
|
STREG %r29, TASK_PT_GR29(%r1) /* 8th argument */
|
|
STREG %r31, TASK_PT_GR31(%r1) /* preserve syscall return ptr */
|
|
|
|
ldo TASK_PT_FR0(%r1), %r27 /* save fpregs from the kernel */
|
|
save_fp %r27 /* or potential task switch */
|
|
|
|
mfctl %cr11, %r27 /* i.e. SAR */
|
|
STREG %r27, TASK_PT_SAR(%r1)
|
|
|
|
loadgp
|
|
|
|
stw %r21, -52(%r30) ;! 5th argument
|
|
stw %r20, -56(%r30) ;! 6th argument
|
|
stw %r19, -60(%r30) ;! 7th argument
|
|
stw %r29, -64(%r30) ;! 8th argument
|
|
|
|
ldil L%hpux_call_table, %r21
|
|
ldo R%hpux_call_table(%r21), %r21
|
|
comiclr,>>= __NR_HPUX_syscalls, %r22, %r0
|
|
b,n syscall_nosys
|
|
LDREGX %r22(%r21), %r21
|
|
ldil L%hpux_syscall_exit,%r2
|
|
be 0(%sr7,%r21)
|
|
ldo R%hpux_syscall_exit(%r2),%r2
|
|
|
|
syscall_nosys:
|
|
ldil L%hpux_syscall_exit,%r1
|
|
be R%hpux_syscall_exit(%sr7,%r1)
|
|
ldo -ENOSYS(%r0),%r28
|
|
ENDPROC(hpux_gateway_page)
|
|
|
|
.align PAGE_SIZE
|
|
ENTRY(end_hpux_gateway_page)
|