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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/parisc/hpux/wrappers.S
downloadlinux-2.6.34-ux500-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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+/*
+ * 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 __LP64__
+#warning PA64 support needs more work...did first cut
+#endif
+
+#include <asm/offsets.h>
+#include <asm/assembly.h>
+#include <asm/signal.h>
+
+#ifdef __LP64__
+ .level 2.0w
+#else
+ .level 1.1
+#endif
+ .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 __LP64__
+#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
+
+
+ .export hpux_fork_wrapper
+ .export hpux_child_return
+ .import sys_fork
+
+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
+
+ /* Set the return value for the child */
+
+hpux_child_return:
+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
+ bl schedule_tail, %r2
+ nop
+#endif
+
+ LDREG TASK_PT_GR19-TASK_SZ_ALGN-128(%r30),%r2
+ b fork_return
+ copy %r0,%r28
+
+ .export hpux_execve_wrapper
+ .export hpux_execv_wrapper
+ .import hpux_execve
+
+hpux_execv_wrapper:
+ copy %r0,%r24 /* NULL environment */
+
+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
+
+ .export hpux_pipe_wrapper
+ .import hpux_pipe
+
+ /* HP-UX expects pipefd's returned in r28 & r29 */
+
+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
+
+ .export hpux_syscall_exit
+ .import syscall_exit
+
+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 syscall_exit
+ nop
+
+ .export hpux_unimplemented_wrapper
+ .import hpux_unimplemented
+
+hpux_unimplemented_wrapper:
+ b hpux_unimplemented
+ STREG %r22,-64(%r30) /* overwrite arg8 with syscall number */