forked from Minki/linux
251 lines
6.1 KiB
ArmAsm
251 lines
6.1 KiB
ArmAsm
/*
|
|
* 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>
|
|
|
|
.level LEVEL
|
|
.text
|
|
|
|
/* 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)
|