/*
* Linux/PARISC Project (http://www.parisc-linux.org/)
*
* HP-UX System Call Wrapper routines and System Call Return Path
*
* Copyright (C) 2000 Hewlett-Packard (John Marvin)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef CONFIG_64BIT
#warning PA64 support needs more work...did first cut
#endif
#include <asm/asm-offsets.h>
#include <asm/assembly.h>
#include <asm/signal.h>
#include <linux/linkage.h>
#include <linux/init.h>
.level LEVEL
__HEAD
/* These should probably go in a header file somewhere.
* They are duplicated in kernel/wrappers.S
* Possibly we should consider consolidating these
* register save/restore macros.
*/
.macro reg_save regs
#ifdef CONFIG_64BIT
#warning NEEDS WORK for 64-bit
#endif
STREG %r3, PT_GR3(\regs)
STREG %r4, PT_GR4(\regs)
STREG %r5, PT_GR5(\regs)
STREG %r6, PT_GR6(\regs)
STREG %r7, PT_GR7(\regs)
STREG %r8, PT_GR8(\regs)
STREG %r9, PT_GR9(\regs)
STREG %r10,PT_GR10(\regs)
STREG %r11,PT_GR11(\regs)
STREG %r12,PT_GR12(\regs)
STREG %r13,PT_GR13(\regs)
STREG %r14,PT_GR14(\regs)
STREG %r15,PT_GR15(\regs)
STREG %r16,PT_GR16(\regs)
STREG %r17,PT_GR17(\regs)
STREG %r18,PT_GR18(\regs)
.endm
.macro reg_restore regs
LDREG PT_GR3(\regs), %r3
LDREG PT_GR4(\regs), %r4
LDREG PT_GR5(\regs), %r5
LDREG PT_GR6(\regs), %r6
LDREG PT_GR7(\regs), %r7
LDREG PT_GR8(\regs), %r8
LDREG PT_GR9(\regs), %r9
LDREG PT_GR10(\regs),%r10
LDREG PT_GR11(\regs),%r11
LDREG PT_GR12(\regs),%r12
LDREG PT_GR13(\regs),%r13
LDREG PT_GR14(\regs),%r14
LDREG PT_GR15(\regs),%r15
LDREG PT_GR16(\regs),%r16
LDREG PT_GR17(\regs),%r17
LDREG PT_GR18(\regs),%r18
.endm
.import sys_fork
ENTRY(hpux_fork_wrapper)
ldo TASK_REGS-TASK_SZ_ALGN-64(%r30),%r1 ;! get pt regs
;! pointer in task
reg_save %r1
STREG %r2,-20(%r30)
ldo 64(%r30),%r30
STREG %r2,PT_GR19(%r1) ;! save for child
STREG %r30,PT_GR21(%r1) ;! save for child
LDREG PT_GR30(%r1),%r25
mtctl %r25,%cr29
copy %r1,%r24
bl sys_clone,%r2
ldi SIGCHLD,%r26
LDREG -84(%r30),%r2
fork_return:
ldo -64(%r30),%r30
ldo TASK_REGS-TASK_SZ_ALGN-64(%r30),%r1 ;! get pt regs
reg_restore %r1
/*
* HP-UX wants pid (child gets parent pid, parent gets child pid)
* in r28 and a flag in r29 (r29 == 1 for child, 0 for parent).
* Linux fork returns 0 for child, pid for parent. Since HP-UX
* libc stub throws away parent pid and returns 0 for child,
* we'll just return 0 for parent pid now. Only applications
* that jump directly to the gateway page (not supported) will
* know the difference. We can fix this later if necessary.
*/
ldo -1024(%r0),%r1
comb,>>=,n %r28,%r1,fork_exit /* just let the syscall exit handle it */
or,= %r28,%r0,%r0
or,tr %r0,%r0,%r29 /* r28 <> 0, we are parent, set r29 to 0 */
ldo 1(%r0),%r29 /* r28 == 0, we are child, set r29 to 1 */
fork_exit:
bv %r0(%r2)
nop
ENDPROC(hpux_fork_wrapper)
/* Set the return value for the child */
ENTRY(hpux_child_return)
#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
bl,n schedule_tail, %r2
#endif
LDREG TASK_PT_GR19-TASK_SZ_ALGN-128(%r30),%r2
b fork_return
copy %r0,%r28
ENDPROC(hpux_child_return)
.import hpux_execve
ENTRY(hpux_execv_wrapper)
copy %r0,%r24 /* NULL environment */
ENTRY(hpux_execve_wrapper)
ldo TASK_REGS-TASK_SZ_ALGN-64(%r30),%r1 ;! get pt regs
/*
* Do we need to save/restore r3-r18 here?
* I don't think so. why would new thread need old
* threads registers?
*/
/* Store arg0, arg1 and arg2 so that hpux_execve will find them */
STREG %r26,PT_GR26(%r1)
STREG %r25,PT_GR25(%r1)
STREG %r24,PT_GR24(%r1)
STREG %r2,-20(%r30)
ldo 64(%r30),%r30
bl hpux_execve,%r2
copy %r1,%arg0
ldo -64(%r30),%r30
LDREG -20(%r30),%r2
/* If exec succeeded we need to load the args */
ldo -1024(%r0),%r1
comb,>>= %r28,%r1,exec_error
copy %r2,%r19
ldo -TASK_SZ_ALGN-64(%r30),%r1 ;! get task ptr
LDREG TASK_PT_GR26(%r1),%r26
LDREG TASK_PT_GR25(%r1),%r25
LDREG TASK_PT_GR24(%r1),%r24
LDREG TASK_PT_GR23(%r1),%r23
copy %r0,%r2 /* Flag to syscall_exit not to clear args */
exec_error:
bv %r0(%r19)
nop
ENDPROC(hpux_execv_wrapper)
.import hpux_pipe
/* HP-UX expects pipefd's returned in r28 & r29 */
ENTRY(hpux_pipe_wrapper)
STREG %r2,-20(%r30)
ldo 64(%r30),%r30
bl hpux_pipe,%r2
ldo -56(%r30),%r26 /* pass local array to hpux_pipe */
ldo -1024(%r0),%r1
comb,>>= %r28,%r1,pipe_exit /* let syscall exit handle it */
LDREG -84(%r30),%r2
/* if success, load fd's from stack array */
LDREG -56(%r30),%r28
LDREG -52(%r30),%r29
pipe_exit:
bv %r0(%r2)
ldo -64(%r30),%r30
ENDPROC(hpux_pipe_wrapper)
.import syscall_exit
ENTRY(hpux_syscall_exit)
/*
*
* HP-UX call return conventions:
*
* if error:
* r22 = 1
* r28 = errno value
* r29 = secondary return value
* else
* r22 = 0
* r28 = return value
* r29 = secondary return value
*
* For now, we'll just check to see if r28 is < (unsigned long)-1024
* (to handle addresses > 2 Gb) and if so set r22 to zero. If not,
* we'll complement r28 and set r22 to 1. Wrappers will be
* needed for syscalls that care about the secondary return value.
* The wrapper may also need a way of avoiding the following code,
* but we'll deal with that when it becomes necessary.
*/
ldo -1024(%r0),%r1
comb,<< %r28,%r1,no_error
copy %r0,%r22
subi 0,%r28,%r28
ldo 1(%r0),%r22
no_error:
b,n syscall_exit
ENDPROC(hpux_syscall_exit)
.import hpux_unimplemented
ENTRY(hpux_unimplemented_wrapper)
b hpux_unimplemented
STREG %r22,-64(%r30) /* overwrite arg8 with syscall number */
ENDPROC(hpux_unimplemented_wrapper)
