Gitiles
Code Review Sign In
gerrit-public.fairphone.software / kernel / msm-4.19 / 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 / . / arch / parisc / hpux / gate.S
blob: 2680a1c0fa7742dd0b23652bdf09fc58e7e710a5 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame^]1/*
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>
12#include <asm/offsets.h>
13#include <asm/unistd.h>
14#include <asm/errno.h>
15
16#ifdef __LP64__
17 .level 2.0w
18#else
19 .level 1.1
20#endif
21 .text
22
23#ifdef __LP64__
24#define FRAME_SIZE 128
25#else
26#define FRAME_SIZE 64
27#endif
28 .import hpux_call_table
29 .import hpux_syscall_exit,code
30 .export hpux_gateway_page
31
32 .align 4096
33hpux_gateway_page:
34 nop
35#ifdef __LP64__
36#warning NEEDS WORK for 64-bit
37#endif
38 ldw -64(%r30), %r29 ;! 8th argument
39 ldw -60(%r30), %r19 ;! 7th argument
40 ldw -56(%r30), %r20 ;! 6th argument
41 ldw -52(%r30), %r21 ;! 5th argument
42 gate .+8, %r0 /* become privileged */
43 mtsp %r0,%sr4 /* get kernel space into sr4 */
44 mtsp %r0,%sr5 /* get kernel space into sr5 */
45 mtsp %r0,%sr6 /* get kernel space into sr6 */
46 mfsp %sr7,%r1 /* save user sr7 */
47 mtsp %r1,%sr3 /* and store it in sr3 */
48
49 mtctl %r30,%cr28
50 mfctl %cr30,%r1
51 xor %r1,%r30,%r30 /* ye olde xor trick */
52 xor %r1,%r30,%r1
53 xor %r1,%r30,%r30
54 ldo TASK_SZ_ALGN+FRAME_SIZE(%r30),%r30 /* set up kernel stack */
55
56 /* N.B.: It is critical that we don't set sr7 to 0 until r30
57 * contains a valid kernel stack pointer. It is also
58 * critical that we don't start using the kernel stack
59 * until after sr7 has been set to 0.
60 */
61
62 mtsp %r0,%sr7 /* get kernel space into sr7 */
63 STREG %r1,TASK_PT_GR30-TASK_SZ_ALGN-FRAME_SIZE(%r30) /* save usp */
64 ldo -TASK_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr in %r1 */
65
66 /* Save some registers for sigcontext and potential task
67 switch (see entry.S for the details of which ones are
68 saved/restored). TASK_PT_PSW is zeroed so we can see whether
69 a process is on a syscall or not. For an interrupt the real
70 PSW value is stored. This is needed for gdb and sys_ptrace. */
71 STREG %r0, TASK_PT_PSW(%r1)
72 STREG %r2, TASK_PT_GR2(%r1) /* preserve rp */
73 STREG %r19, TASK_PT_GR19(%r1) /* 7th argument */
74 STREG %r20, TASK_PT_GR20(%r1) /* 6th argument */
75 STREG %r21, TASK_PT_GR21(%r1) /* 5th argument */
76 STREG %r22, TASK_PT_GR22(%r1) /* syscall # */
77 STREG %r23, TASK_PT_GR23(%r1) /* 4th argument */
78 STREG %r24, TASK_PT_GR24(%r1) /* 3rd argument */
79 STREG %r25, TASK_PT_GR25(%r1) /* 2nd argument */
80 STREG %r26, TASK_PT_GR26(%r1) /* 1st argument */
81 STREG %r27, TASK_PT_GR27(%r1) /* user dp */
82 STREG %r28, TASK_PT_GR28(%r1) /* return value 0 */
83 STREG %r28, TASK_PT_ORIG_R28(%r1) /* return value 0 (saved for signals) */
84 STREG %r29, TASK_PT_GR29(%r1) /* 8th argument */
85 STREG %r31, TASK_PT_GR31(%r1) /* preserve syscall return ptr */
86
87 ldo TASK_PT_FR0(%r1), %r27 /* save fpregs from the kernel */
88 save_fp %r27 /* or potential task switch */
89
90 mfctl %cr11, %r27 /* i.e. SAR */
91 STREG %r27, TASK_PT_SAR(%r1)
92
93 loadgp
94
95 stw %r21, -52(%r30) ;! 5th argument
96 stw %r20, -56(%r30) ;! 6th argument
97 stw %r19, -60(%r30) ;! 7th argument
98 stw %r29, -64(%r30) ;! 8th argument
99
100 ldil L%hpux_call_table, %r21
101 ldo R%hpux_call_table(%r21), %r21
102 comiclr,>>= __NR_HPUX_syscalls, %r22, %r0
103 b,n syscall_nosys
104 ldwx,s %r22(%r21), %r21
105 ldil L%hpux_syscall_exit,%r2
106 be 0(%sr7,%r21)
107 ldo R%hpux_syscall_exit(%r2),%r2
108
109syscall_nosys:
110 ldil L%hpux_syscall_exit,%r1
111 be R%hpux_syscall_exit(%sr7,%r1)
112 ldo -ENOSYS(%r0),%r28
113
114 .align 4096
115 .export end_hpux_gateway_page
116end_hpux_gateway_page: