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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 *
3 * Linux/PARISC Project (http://www.parisc-linux.org/)
4 *
5 * System call entry code Copyright (c) Matthew Wilcox 1999 <willy@bofh.ai>
6 * Licensed under the GNU GPL.
7 * thanks to Philipp Rumpf, Mike Shaver and various others
8 * sorry about the wall, puffin..
9 */
10
11#include <asm/assembly.h>
Sam Ravnborg0013a852005-09-09 20:57:26 +020012#include <asm/asm-offsets.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <asm/unistd.h>
14#include <asm/errno.h>
Helge Deller79793452007-01-28 16:43:32 +010015#include <linux/linkage.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
Helge Deller79793452007-01-28 16:43:32 +010017 .level LEVEL
Kyle McMartindfcf7532008-05-22 14:36:31 -040018 .text
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 .import hpux_call_table
21 .import hpux_syscall_exit,code
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
Kyle McMartin873d50e2007-10-18 00:04:53 -070023 .align PAGE_SIZE
Helge Deller79793452007-01-28 16:43:32 +010024ENTRY(hpux_gateway_page)
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 nop
Helge Deller79793452007-01-28 16:43:32 +010026#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#warning NEEDS WORK for 64-bit
28#endif
29 ldw -64(%r30), %r29 ;! 8th argument
30 ldw -60(%r30), %r19 ;! 7th argument
31 ldw -56(%r30), %r20 ;! 6th argument
32 ldw -52(%r30), %r21 ;! 5th argument
33 gate .+8, %r0 /* become privileged */
34 mtsp %r0,%sr4 /* get kernel space into sr4 */
35 mtsp %r0,%sr5 /* get kernel space into sr5 */
36 mtsp %r0,%sr6 /* get kernel space into sr6 */
37 mfsp %sr7,%r1 /* save user sr7 */
38 mtsp %r1,%sr3 /* and store it in sr3 */
39
40 mtctl %r30,%cr28
41 mfctl %cr30,%r1
42 xor %r1,%r30,%r30 /* ye olde xor trick */
43 xor %r1,%r30,%r1
44 xor %r1,%r30,%r30
45 ldo TASK_SZ_ALGN+FRAME_SIZE(%r30),%r30 /* set up kernel stack */
46
47 /* N.B.: It is critical that we don't set sr7 to 0 until r30
48 * contains a valid kernel stack pointer. It is also
49 * critical that we don't start using the kernel stack
50 * until after sr7 has been set to 0.
51 */
52
53 mtsp %r0,%sr7 /* get kernel space into sr7 */
54 STREG %r1,TASK_PT_GR30-TASK_SZ_ALGN-FRAME_SIZE(%r30) /* save usp */
55 ldo -TASK_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr in %r1 */
56
57 /* Save some registers for sigcontext and potential task
58 switch (see entry.S for the details of which ones are
59 saved/restored). TASK_PT_PSW is zeroed so we can see whether
60 a process is on a syscall or not. For an interrupt the real
61 PSW value is stored. This is needed for gdb and sys_ptrace. */
62 STREG %r0, TASK_PT_PSW(%r1)
63 STREG %r2, TASK_PT_GR2(%r1) /* preserve rp */
64 STREG %r19, TASK_PT_GR19(%r1) /* 7th argument */
65 STREG %r20, TASK_PT_GR20(%r1) /* 6th argument */
66 STREG %r21, TASK_PT_GR21(%r1) /* 5th argument */
67 STREG %r22, TASK_PT_GR22(%r1) /* syscall # */
68 STREG %r23, TASK_PT_GR23(%r1) /* 4th argument */
69 STREG %r24, TASK_PT_GR24(%r1) /* 3rd argument */
70 STREG %r25, TASK_PT_GR25(%r1) /* 2nd argument */
71 STREG %r26, TASK_PT_GR26(%r1) /* 1st argument */
72 STREG %r27, TASK_PT_GR27(%r1) /* user dp */
73 STREG %r28, TASK_PT_GR28(%r1) /* return value 0 */
74 STREG %r28, TASK_PT_ORIG_R28(%r1) /* return value 0 (saved for signals) */
75 STREG %r29, TASK_PT_GR29(%r1) /* 8th argument */
76 STREG %r31, TASK_PT_GR31(%r1) /* preserve syscall return ptr */
77
78 ldo TASK_PT_FR0(%r1), %r27 /* save fpregs from the kernel */
79 save_fp %r27 /* or potential task switch */
80
81 mfctl %cr11, %r27 /* i.e. SAR */
82 STREG %r27, TASK_PT_SAR(%r1)
83
84 loadgp
85
86 stw %r21, -52(%r30) ;! 5th argument
87 stw %r20, -56(%r30) ;! 6th argument
88 stw %r19, -60(%r30) ;! 7th argument
89 stw %r29, -64(%r30) ;! 8th argument
90
91 ldil L%hpux_call_table, %r21
92 ldo R%hpux_call_table(%r21), %r21
93 comiclr,>>= __NR_HPUX_syscalls, %r22, %r0
94 b,n syscall_nosys
Helge Deller79793452007-01-28 16:43:32 +010095 LDREGX %r22(%r21), %r21
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 ldil L%hpux_syscall_exit,%r2
97 be 0(%sr7,%r21)
98 ldo R%hpux_syscall_exit(%r2),%r2
99
100syscall_nosys:
101 ldil L%hpux_syscall_exit,%r1
102 be R%hpux_syscall_exit(%sr7,%r1)
103 ldo -ENOSYS(%r0),%r28
Helge Deller79793452007-01-28 16:43:32 +0100104ENDPROC(hpux_gateway_page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
Kyle McMartin873d50e2007-10-18 00:04:53 -0700106 .align PAGE_SIZE
Helge Deller79793452007-01-28 16:43:32 +0100107ENTRY(end_hpux_gateway_page)