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