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/offset.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:
117