2 * Linux/PARISC Project (http://www.parisc-linux.org/)
4 * HP-UX System Call Wrapper routines and System Call Return Path
6 * Copyright (C) 2000 Hewlett-Packard (John Marvin)
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2, or (at your option)
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #warning PA64 support needs more work...did first cut
27 #include <asm/asm-offsets.h>
28 #include <asm/assembly.h>
29 #include <asm/signal.h>
30 #include <linux/linkage.h>
35 /* These should probably go in a header file somewhere.
36 * They are duplicated in kernel/wrappers.S
37 * Possibly we should consider consolidating these
38 * register save/restore macros.
42 #warning NEEDS WORK for 64-bit
44 STREG %r3, PT_GR3(\regs)
45 STREG %r4, PT_GR4(\regs)
46 STREG %r5, PT_GR5(\regs)
47 STREG %r6, PT_GR6(\regs)
48 STREG %r7, PT_GR7(\regs)
49 STREG %r8, PT_GR8(\regs)
50 STREG %r9, PT_GR9(\regs)
51 STREG %r10,PT_GR10(\regs)
52 STREG %r11,PT_GR11(\regs)
53 STREG %r12,PT_GR12(\regs)
54 STREG %r13,PT_GR13(\regs)
55 STREG %r14,PT_GR14(\regs)
56 STREG %r15,PT_GR15(\regs)
57 STREG %r16,PT_GR16(\regs)
58 STREG %r17,PT_GR17(\regs)
59 STREG %r18,PT_GR18(\regs)
62 .macro reg_restore regs
63 LDREG PT_GR3(\regs), %r3
64 LDREG PT_GR4(\regs), %r4
65 LDREG PT_GR5(\regs), %r5
66 LDREG PT_GR6(\regs), %r6
67 LDREG PT_GR7(\regs), %r7
68 LDREG PT_GR8(\regs), %r8
69 LDREG PT_GR9(\regs), %r9
70 LDREG PT_GR10(\regs),%r10
71 LDREG PT_GR11(\regs),%r11
72 LDREG PT_GR12(\regs),%r12
73 LDREG PT_GR13(\regs),%r13
74 LDREG PT_GR14(\regs),%r14
75 LDREG PT_GR15(\regs),%r15
76 LDREG PT_GR16(\regs),%r16
77 LDREG PT_GR17(\regs),%r17
78 LDREG PT_GR18(\regs),%r18
84 ENTRY(hpux_fork_wrapper)
85 ldo TASK_REGS-TASK_SZ_ALGN-64(%r30),%r1 ;! get pt regs
91 STREG %r2,PT_GR19(%r1) ;! save for child
92 STREG %r30,PT_GR21(%r1) ;! save for child
94 LDREG PT_GR30(%r1),%r25
103 ldo TASK_REGS-TASK_SZ_ALGN-64(%r30),%r1 ;! get pt regs
108 * HP-UX wants pid (child gets parent pid, parent gets child pid)
109 * in r28 and a flag in r29 (r29 == 1 for child, 0 for parent).
110 * Linux fork returns 0 for child, pid for parent. Since HP-UX
111 * libc stub throws away parent pid and returns 0 for child,
112 * we'll just return 0 for parent pid now. Only applications
113 * that jump directly to the gateway page (not supported) will
114 * know the difference. We can fix this later if necessary.
118 comb,>>=,n %r28,%r1,fork_exit /* just let the syscall exit handle it */
120 or,tr %r0,%r0,%r29 /* r28 <> 0, we are parent, set r29 to 0 */
121 ldo 1(%r0),%r29 /* r28 == 0, we are child, set r29 to 1 */
126 ENDPROC(hpux_fork_wrapper)
128 /* Set the return value for the child */
130 ENTRY(hpux_child_return)
131 #if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
132 bl,n schedule_tail, %r2
135 LDREG TASK_PT_GR19-TASK_SZ_ALGN-128(%r30),%r2
138 ENDPROC(hpux_child_return)
142 ENTRY(hpux_execv_wrapper)
143 copy %r0,%r24 /* NULL environment */
145 ENTRY(hpux_execve_wrapper)
147 ldo TASK_REGS-TASK_SZ_ALGN-64(%r30),%r1 ;! get pt regs
150 * Do we need to save/restore r3-r18 here?
151 * I don't think so. why would new thread need old
155 /* Store arg0, arg1 and arg2 so that hpux_execve will find them */
157 STREG %r26,PT_GR26(%r1)
158 STREG %r25,PT_GR25(%r1)
159 STREG %r24,PT_GR24(%r1)
169 /* If exec succeeded we need to load the args */
172 comb,>>= %r28,%r1,exec_error
174 ldo -TASK_SZ_ALGN-64(%r30),%r1 ;! get task ptr
175 LDREG TASK_PT_GR26(%r1),%r26
176 LDREG TASK_PT_GR25(%r1),%r25
177 LDREG TASK_PT_GR24(%r1),%r24
178 LDREG TASK_PT_GR23(%r1),%r23
179 copy %r0,%r2 /* Flag to syscall_exit not to clear args */
184 ENDPROC(hpux_execv_wrapper)
188 /* HP-UX expects pipefd's returned in r28 & r29 */
190 ENTRY(hpux_pipe_wrapper)
194 ldo -56(%r30),%r26 /* pass local array to hpux_pipe */
198 comb,>>= %r28,%r1,pipe_exit /* let syscall exit handle it */
201 /* if success, load fd's from stack array */
209 ENDPROC(hpux_pipe_wrapper)
213 ENTRY(hpux_syscall_exit)
216 * HP-UX call return conventions:
221 * r29 = secondary return value
225 * r29 = secondary return value
227 * For now, we'll just check to see if r28 is < (unsigned long)-1024
228 * (to handle addresses > 2 Gb) and if so set r22 to zero. If not,
229 * we'll complement r28 and set r22 to 1. Wrappers will be
230 * needed for syscalls that care about the secondary return value.
231 * The wrapper may also need a way of avoiding the following code,
232 * but we'll deal with that when it becomes necessary.
236 comb,<< %r28,%r1,no_error
243 ENDPROC(hpux_syscall_exit)
245 .import hpux_unimplemented
247 ENTRY(hpux_unimplemented_wrapper)
249 STREG %r22,-64(%r30) /* overwrite arg8 with syscall number */
250 ENDPROC(hpux_unimplemented_wrapper)