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[PATCH] syscall cancellation support for HPPA

From: Carlos O'Donell <carlos at baldric dot uwo dot ca>
To: libc-alpha <libc-alpha at sources dot redhat dot com>,parisc-linux at lists dot parisc-linux dot org
Date: Fri, 10 Oct 2003 17:08:45 -0400
Subject: [PATCH] syscall cancellation support for HPPA
libc-alpha,

Passes testsuite.

Cheers,
Carlos.
===

2003-10-10  Carlos O'Donell  <carlos@baldric.uwo.ca>

	* linuxthreads/sysdeps/unix/sysv/linux/hppa/sysdep-cancel.h: 
	New file.

--- libc/linuxthreads/sysdeps/unix/sysv/linux/hppa/sysdep-cancel.h.orig	1969-12-31 19:00:00.000000000 -0500
+++ libc/linuxthreads/sysdeps/unix/sysv/linux/hppa/sysdep-cancel.h	2003-08-30 17:26:42.000000000 -0400
@@ -0,0 +1,190 @@
+/* Copyright (C) 2003 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Carlos O'Donell <carlos@baldric.uwo.ca>, 2003.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sysdep.h>
+#ifndef __ASSEMBLER__
+# include <linuxthreads/internals.h>
+#endif
+
+#if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
+
+# ifndef NO_ERROR
+#  define NO_ERROR -0x1000
+# endif
+
+# undef PSEUDO
+# define PSEUDO(name, syscall_name, args)				\
+  ENTRY (name)								\
+    SINGLE_THREAD_P					ASM_LINE_SEP	\
+    cmpib,<> 0,%ret0,Lpseudo_cancel			ASM_LINE_SEP	\
+    nop							ASM_LINE_SEP	\
+    DO_CALL(syscall_name, args)				ASM_LINE_SEP	\
+    /* DONE! */						ASM_LINE_SEP	\
+    bv 0(2)						ASM_LINE_SEP	\
+    nop							ASM_LINE_SEP	\
+  Lpseudo_cancel:					ASM_LINE_SEP	\
+    /* store return ptr */				ASM_LINE_SEP	\
+    stw %rp, -20(%sr0,%sp)				ASM_LINE_SEP	\
+    /* save syscall args */				ASM_LINE_SEP	\
+    PUSHARGS_##args /* MACRO */				ASM_LINE_SEP	\
+    STW_PIC						ASM_LINE_SEP	\
+    CENABLE /* FUNC CALL */				ASM_LINE_SEP	\
+    ldo 64(%sp), %sp					ASM_LINE_SEP	\
+    ldo -64(%sp), %sp					ASM_LINE_SEP	\
+    LDW_PIC						ASM_LINE_SEP	\
+    /* restore syscall args */				ASM_LINE_SEP	\
+    POPARGS_##args					ASM_LINE_SEP	\
+    /* save r4 in arg0 stack slot */			ASM_LINE_SEP	\
+    stw %r4, -36(%sr0,%sp)				ASM_LINE_SEP	\
+    /* save mask from cenable */			ASM_LINE_SEP	\
+    copy %ret0, %r4					ASM_LINE_SEP	\
+    ble 0x100(%sr2,%r0)					ASM_LINE_SEP    \
+    ldi SYS_ify (syscall_name), %r20			ASM_LINE_SEP	\
+    LDW_PIC						ASM_LINE_SEP	\
+    /* pass mask as arg0 to cdisable */			ASM_LINE_SEP	\
+    copy %r4, %r26					ASM_LINE_SEP	\
+    copy %ret0, %r4					ASM_LINE_SEP	\
+    CDISABLE						ASM_LINE_SEP	\
+    ldo 64(%sp), %sp					ASM_LINE_SEP	\
+    ldo -64(%sp), %sp					ASM_LINE_SEP	\
+    LDW_PIC						ASM_LINE_SEP	\
+    /* compare error */					ASM_LINE_SEP	\
+    ldi NO_ERROR,%r1					ASM_LINE_SEP	\
+    /* branch if no error */				ASM_LINE_SEP	\
+    cmpb,>>=,n %r1,%r4,Lpre_end				ASM_LINE_SEP	\
+    nop							ASM_LINE_SEP	\
+    SYSCALL_ERROR_HANDLER				ASM_LINE_SEP	\
+    ldo 64(%sp), %sp					ASM_LINE_SEP	\
+    ldo -64(%sp), %sp					ASM_LINE_SEP	\
+    /* No need to LDW_PIC */				ASM_LINE_SEP	\
+    /* make syscall res value positive */		ASM_LINE_SEP	\
+    sub %r0, %r4, %r4					ASM_LINE_SEP	\
+    /* store into errno location */			ASM_LINE_SEP	\
+    stw %r4, 0(%sr0,%ret0)				ASM_LINE_SEP	\
+    /* return -1 */					ASM_LINE_SEP	\
+    ldo -1(%r0), %ret0					ASM_LINE_SEP	\
+  Lpre_end:						ASM_LINE_SEP	\
+    ldw -20(%sr0,%sp), %rp             			ASM_LINE_SEP	\
+    /* No need to LDW_PIC */				ASM_LINE_SEP	\
+    ldw -36(%sr0,%sp), %r4				ASM_LINE_SEP
+
+/* Save arguments into our frame */
+# define PUSHARGS_0	/* nothing to do */
+# define PUSHARGS_1	PUSHARGS_0 stw %r26, -36(%sr0,%sp)	ASM_LINE_SEP
+# define PUSHARGS_2	PUSHARGS_1 stw %r25, -40(%sr0,%sp)	ASM_LINE_SEP
+# define PUSHARGS_3	PUSHARGS_2 stw %r24, -44(%sr0,%sp)	ASM_LINE_SEP
+# define PUSHARGS_4	PUSHARGS_3 stw %r23, -48(%sr0,%sp)	ASM_LINE_SEP
+# define PUSHARGS_5	PUSHARGS_4 /* Args are on the stack... */
+# define PUSHARGS_6	PUSHARGS_5
+
+/* Bring them back from the stack */
+# define POPARGS_0	/* nothing to do */
+# define POPARGS_1	POPARGS_0 ldw -36(%sr0,%sp), %r26	ASM_LINE_SEP
+# define POPARGS_2	POPARGS_1 ldw -40(%sr0,%sp), %r25	ASM_LINE_SEP
+# define POPARGS_3	POPARGS_2 ldw -44(%sr0,%sp), %r24	ASM_LINE_SEP
+# define POPARGS_4	POPARGS_3 ldw -48(%sr0,%sp), %r23	ASM_LINE_SEP
+# define POPARGS_5	POPARGS_4 ldw -52(%sr0,%sp), %r22	ASM_LINE_SEP
+# define POPARGS_6	POPARGS_5 ldw -54(%sr0,%sp), %r21	ASM_LINE_SEP
+
+# ifdef IS_IN_libpthread
+#  ifdef PIC
+#   define CENABLE .import __pthread_enable_asynccancel,code ASM_LINE_SEP \
+			bl __pthread_enable_asynccancel,%r2 ASM_LINE_SEP
+#   define CDISABLE .import __pthread_disable_asynccancel,code ASM_LINE_SEP \
+			bl __pthread_disable_asynccancel,%r2 ASM_LINE_SEP 
+#  else
+#   define CENABLE .import __pthread_enable_asynccancel,code ASM_LINE_SEP \
+			bl __pthread_enable_asynccancel,%r2 ASM_LINE_SEP
+#   define CDISABLE .import __pthread_disable_asynccancel,code ASM_LINE_SEP \
+			bl __pthread_disable_asynccancel,%r2 ASM_LINE_SEP 
+#  endif
+# elif !defined NOT_IN_libc
+#  ifdef PIC
+#   define CENABLE .import __libc_enable_asynccancel,code ASM_LINE_SEP \
+			bl __libc_enable_asynccancel,%r2 ASM_LINE_SEP 
+#   define CDISABLE	.import __libc_disable_asynccancel,code ASM_LINE_SEP \
+			bl __libc_disable_asynccancel,%r2 ASM_LINE_SEP 
+#  else
+#   define CENABLE .import __libc_enable_asynccancel,code ASM_LINE_SEP \
+			bl __libc_enable_asynccancel,%r2 ASM_LINE_SEP 
+#   define CDISABLE	.import __libc_disable_asynccancel,code ASM_LINE_SEP \
+			bl __libc_disable_asynccancel,%r2 ASM_LINE_SEP 
+#  endif
+# else
+#  ifdef PIC
+#   define CENABLE .import __librt_enable_asynccancel,code ASM_LINE_SEP \
+			bl __librt_enable_asynccancel,%r2 ASM_LINE_SEP 
+#   define CDISABLE .import __librt_disable_asynccancel,code ASM_LINE_SEP \
+			bl __librt_disable_asynccancel,%r2 ASM_LINE_SEP 
+#  else
+#   define CENABLE .import __librt_enable_asynccancel,code ASM_LINE_SEP \
+			bl __librt_enable_asynccancel,%r2 ASM_LINE_SEP 
+#   define CDISABLE .import __librt_disable_asynccancel,code ASM_LINE_SEP \
+			bl __librt_disable_asynccancel,%r2 ASM_LINE_SEP 
+#  endif
+# endif	
+
+/* p_header.multiple_threads is +12 from the pthread_descr struct start,
+   We could have called __get_cr27() but we really want less overhead */
+# define MULTIPLE_THREADS_OFFSET 0xC
+
+/* cr27 has been initialized to 0x0 by kernel */
+# define NO_THREAD_CR27 0x0
+			
+# ifdef IS_IN_libpthread
+#  define __local_multiple_threads __pthread_multiple_threads
+# elif !defined NOT_IN_libc
+#  define __local_multiple_threads __libc_multiple_threads
+# else
+#  define __local_multiple_threads __librt_multiple_threads
+# endif
+
+# ifndef __ASSEMBLER__
+ extern int __local_multiple_threads attribute_hidden;
+#  define SINGLE_THREAD_P __builtin_expect (__local_multiple_threads == 0, 1)
+# else
+/* This ALT version requires newer kernel support */
+#  define SINGLE_THREAD_P_MFCTL						\
+	mfctl %cr27, %ret0					ASM_LINE_SEP	\
+	cmpib,= NO_THREAD_CR27,%ret0,Lstp			ASM_LINE_SEP	\
+	nop							ASM_LINE_SEP	\
+	ldw MULTIPLE_THREADS_OFFSET(%sr0,%ret0),%ret0		ASM_LINE_SEP	\
+ Lstp:								ASM_LINE_SEP	
+#  ifdef PIC
+/* Slower version uses GOT to get value of __local_multiple_threads */
+#   define SINGLE_THREAD_P							\
+	addil LT%__local_multiple_threads, %r19			ASM_LINE_SEP	\
+	ldw RT%__local_multiple_threads(%sr0,%r1), %ret0	ASM_LINE_SEP	\
+	ldw 0(%sr0,%ret0), %ret0 				ASM_LINE_SEP
+#  else
+  /* Slow non-pic version using DP */
+#   define SINGLE_THREAD_P								\
+	addil LR%__local_multiple_threads-$global$,%r27  		ASM_LINE_SEP	\
+	ldw RR%__local_multiple_threads-$global$(%sr0,%r1),%ret0	ASM_LINE_SEP
+#  endif	
+# endif
+#elif !defined __ASSEMBLER__
+
+/* This code should never be used but we define it anyhow.  */
+# define SINGLE_THREAD_P (1)
+
+#endif
+/* !defined NOT_IN_libc || defined IS_IN_libpthread */
+
+
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