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-rw-r--r--sysdeps/unix/sysv/linux/hppa/sysdep.h419
1 files changed, 419 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/hppa/sysdep.h b/sysdeps/unix/sysv/linux/hppa/sysdep.h
new file mode 100644
index 0000000000..4cfe63c556
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/hppa/sysdep.h
@@ -0,0 +1,419 @@
+/* Assembler macros for PA-RISC.
+   Copyright (C) 1999, 2001, 2002, 2003 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper, <drepper@cygnus.com>, August 1999.
+   Linux/PA-RISC changes by Philipp Rumpf, <prumpf@tux.org>, March 2000.
+
+   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 <asm/unistd.h>
+#include <sysdeps/generic/sysdep.h>
+#include <sys/syscall.h>
+#include "config.h"
+
+#ifndef ASM_LINE_SEP
+# define ASM_LINE_SEP ;
+#endif
+
+#undef SYS_ify
+#define SYS_ify(syscall_name)	(__NR_##syscall_name)
+
+#ifdef PIC
+/* WARNING: CANNOT BE USED IN A NOP! */
+# define STW_PIC stw %r19, -32(%sr0, %sp) ASM_LINE_SEP
+# define LDW_PIC ldw -32(%sr0, %sp), %r19 ASM_LINE_SEP
+# define STW_ASM_PIC	"       copy %%r19, %%r4\n"
+# define LDW_ASM_PIC	"       copy %%r4, %%r19\n"
+# define USING_GR4	"%r4",
+#else
+# define STW_PIC ASM_LINE_SEP
+# define LDW_PIC ASM_LINE_SEP
+# define STW_ASM_PIC	" \n"
+# define LDW_ASM_PIC	" \n"
+# define USING_GR4
+#endif
+
+#ifdef __ASSEMBLER__
+
+/* Syntactic details of assembler.  */
+
+#define ALIGNARG(log2) log2
+
+/* For Linux we can use the system call table in the header file
+	/usr/include/asm/unistd.h
+   of the kernel.  But these symbols do not follow the SYS_* syntax
+   so we have to redefine the `SYS_ify' macro here.  */
+#undef SYS_ify
+#define SYS_ify(syscall_name)	__NR_##syscall_name
+
+/* ELF-like local names start with `.L'.  */
+#undef L
+#define L(name)	.L##name
+
+/* Linux uses a negative return value to indicate syscall errors,
+   unlike most Unices, which use the condition codes' carry flag.
+
+   Since version 2.1 the return value of a system call might be
+   negative even if the call succeeded.  E.g., the `lseek' system call
+   might return a large offset.  Therefore we must not anymore test
+   for < 0, but test for a real error by making sure the value in %eax
+   is a real error number.  Linus said he will make sure the no syscall
+   returns a value in -1 .. -4095 as a valid result so we can safely
+   test with -4095.  */
+
+/* We don't want the label for the error handle to be global when we define
+   it here.  */
+#ifdef PIC
+# define SYSCALL_ERROR_LABEL 0f
+#else
+# define SYSCALL_ERROR_LABEL syscall_error
+#endif
+
+/* Define an entry point visible from C.
+
+   There is currently a bug in gdb which prevents us from specifying
+   incomplete stabs information.  Fake some entries here which specify
+   the current source file.  */
+#define	ENTRY(name)						\
+	.text					ASM_LINE_SEP	\
+	.export C_SYMBOL_NAME(name)		ASM_LINE_SEP	\
+	.type	C_SYMBOL_NAME(name),@function	ASM_LINE_SEP	\
+	C_LABEL(name)				ASM_LINE_SEP	\
+	CALL_MCOUNT				ASM_LINE_SEP
+
+#undef	END
+#define END(name)							\
+1:							ASM_LINE_SEP	\
+.size	C_SYMBOL_NAME(name),1b-C_SYMBOL_NAME(name)	ASM_LINE_SEP
+
+/* If compiled for profiling, call `mcount' at the start of each function.  */
+/* No, don't bother.  gcc will put the call in for us.  */
+#define CALL_MCOUNT		/* Do nothing.  */
+
+/* syscall wrappers consist of
+	#include <sysdep.h>
+	PSEUDO(...)
+	ret
+	PSEUDO_END(...)
+
+   which means
+	ENTRY(name)
+	DO_CALL(...)
+	nop
+	bv 0(2)
+	nop
+*/
+
+#define	PSEUDO(name, syscall_name, args)			\
+  ENTRY (name)							\
+  DO_CALL(syscall_name, args)			ASM_LINE_SEP	\
+  nop						ASM_LINE_SEP
+
+#define ret \
+	/* Return value set by ERRNO code */	ASM_LINE_SEP	\
+	bv 0(2)					ASM_LINE_SEP	\
+	nop					ASM_LINE_SEP
+
+#undef	PSEUDO_END
+#define	PSEUDO_END(name)					\
+  END (name)
+
+/* We don't set the errno on the return from the syscall */
+#define	PSEUDO_NOERRNO(name, syscall_name, args)		\
+  ENTRY (name)							\
+  DO_CALL_NOERRNO(syscall_name, args)		ASM_LINE_SEP	\
+  nop						ASM_LINE_SEP
+
+#define ret_NOERRNO ret
+
+#undef	PSEUDO_END_NOERRNO
+#define	PSEUDO_END_NOERRNO(name)				\
+  END (name)
+
+/* This has to return the error value */
+#undef  PSEUDO_ERRVAL
+#define PSEUDO_ERRVAL(name, syscall_name, args)			\
+	ENTRY(name)						\
+	DO_CALL_ERRVAL(syscall_name, args)	ASM_LINE_SEP	\
+	nop					ASM_LINE_SEP
+
+#define ret_ERRVAL ret
+
+#undef	PSEUDO_END_ERRVAL
+#define PSEUDO_END_ERRVAL(name)					\
+	END(name)
+
+#undef JUMPTARGET
+#define JUMPTARGET(name)	name
+#define SYSCALL_PIC_SETUP	/* Nothing.  */
+
+
+/* All the syscall assembly macros rely on finding the approriate
+   SYSCALL_ERROR_LABEL or rather HANDLER. */
+
+/* int * __errno_location(void) so you have to store your value
+   into the return address! */
+#define DEFAULT_SYSCALL_ERROR_HANDLER 			\
+	.import __errno_location,code	ASM_LINE_SEP	\
+	/* branch to errno handler */	ASM_LINE_SEP	\
+	bl __errno_location,%rp		ASM_LINE_SEP
+
+/* Here are the myriad of configuration options that the above can
+   work for... what we've done is provide the framework for future
+   changes if required to each section */
+
+#ifdef PIC
+# if RTLD_PRIVATE_ERRNO
+#  define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
+# else /* !RTLD_PRIVATE_ERRNO */
+#  if defined _LIBC_REENTRANT
+#   define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
+#  else /* !_LIBC_REENTRANT */
+#   define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
+#  endif /* _LIBC_REENTRANT */
+# endif /* RTLD_PRIVATE_ERRNO */
+#else
+# ifndef _LIBC_REENTRANT
+#  define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
+# else
+#  define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
+# endif
+#endif
+
+
+/* Linux takes system call arguments in registers:
+	syscall number	gr20
+	arg 1		gr26
+	arg 2		gr25
+	arg 3		gr24
+	arg 4		gr23
+	arg 5		gr22
+	arg 6		gr21
+
+   The compiler calls us by the C convention:
+	syscall number	in the DO_CALL macro
+	arg 1		gr26
+	arg 2		gr25
+	arg 3		gr24
+	arg 4		gr23
+	arg 5		-52(gr30)
+	arg 6		-56(gr30)
+
+   gr22 and gr21 are caller-saves, so we can just load the arguments
+   there and generally be happy. */
+
+/* the cmpb...no_error code below inside DO_CALL
+ * is intended to mimic the if (__sys_res...)
+ * code inside INLINE_SYSCALL
+ */
+
+#undef	DO_CALL
+#define DO_CALL(syscall_name, args)				\
+	DOARGS_##args				ASM_LINE_SEP	\
+	STW_PIC					ASM_LINE_SEP	\
+	/* Do syscall, delay loads # */		ASM_LINE_SEP	\
+	ble  0x100(%sr2,%r0)			ASM_LINE_SEP	\
+	ldi SYS_ify (syscall_name), %r20	ASM_LINE_SEP	\
+	ldi -0x1000,%r1				ASM_LINE_SEP	\
+	cmpb,>>=,n %r1,%ret0,0f			ASM_LINE_SEP	\
+	/* save rp or we get lost */		ASM_LINE_SEP	\
+	stw %rp, -20(%sr0,%sp)			ASM_LINE_SEP	\
+	/* Restore r19 from frame */		ASM_LINE_SEP	\
+	LDW_PIC					ASM_LINE_SEP	\
+	stw %ret0, -24(%sr0,%sp)		ASM_LINE_SEP	\
+	SYSCALL_ERROR_HANDLER			ASM_LINE_SEP	\
+	/* create frame */			ASM_LINE_SEP	\
+	ldo 64(%sp), %sp			ASM_LINE_SEP	\
+	ldo -64(%sp), %sp			ASM_LINE_SEP	\
+	/* OPTIMIZE: Don't reload r19 */	ASM_LINE_SEP	\
+	/* do a -1*syscall_ret0 */		ASM_LINE_SEP	\
+	ldw -24(%sr0,%sp), %r26			ASM_LINE_SEP	\
+	sub %r0, %r26, %r26			ASM_LINE_SEP	\
+	/* Store into errno location */		ASM_LINE_SEP	\
+	stw %r26, 0(%sr0,%ret0)			ASM_LINE_SEP	\
+	/* return -1 as error */		ASM_LINE_SEP	\
+	ldo -1(%r0), %ret0			ASM_LINE_SEP	\
+	ldw -20(%sr0,%sp), %rp			ASM_LINE_SEP	\
+0:						ASM_LINE_SEP	\
+	UNDOARGS_##args				ASM_LINE_SEP
+
+/* We do nothing with the return, except hand it back to someone else */
+#undef  DO_CALL_NOERRNO
+#define DO_CALL_NOERRNO(syscall_name, args)			\
+	DOARGS_##args                                           \
+	/* No need to store r19 */		ASM_LINE_SEP	\
+	ble  0x100(%sr2,%r0)                    ASM_LINE_SEP    \
+	ldi SYS_ify (syscall_name), %r20        ASM_LINE_SEP    \
+	/* Caller will restore r19 */		ASM_LINE_SEP	\
+	UNDOARGS_##args
+
+/* Here, we return the ERRVAL in assembly, note we don't call the
+   error handler function, but we do 'negate' the return _IF_
+   it's an error. Not sure if this is the right semantic. */
+
+#undef	DO_CALL_ERRVAL
+#define DO_CALL_ERRVAL(syscall_name, args)			\
+	DOARGS_##args				ASM_LINE_SEP	\
+	/* No need to store r19 */		ASM_LINE_SEP	\
+	ble  0x100(%sr2,%r0)			ASM_LINE_SEP	\
+	ldi SYS_ify (syscall_name), %r20	ASM_LINE_SEP	\
+	/* Caller will restore r19 */		ASM_LINE_SEP	\
+	ldi -0x1000,%r1				ASM_LINE_SEP	\
+	cmpb,>>=,n %r1,%ret0,0f			ASM_LINE_SEP	\
+	sub %r0, %ret0, %ret0			ASM_LINE_SEP	\
+0:						ASM_LINE_SEP	\
+	UNDOARGS_##args				ASM_LINE_SEP
+
+#define DOARGS_0 /* nothing */
+#define DOARGS_1 /* nothing */
+#define DOARGS_2 /* nothing */
+#define DOARGS_3 /* nothing */
+#define DOARGS_4 /* nothing */
+#define DOARGS_5 ldw -52(%r30), %r22		ASM_LINE_SEP
+#define DOARGS_6 ldw -52(%r30), %r22		ASM_LINE_SEP	\
+		 ldw -56(%r30), %r21		ASM_LINE_SEP
+
+
+#define UNDOARGS_0 /* nothing */
+#define UNDOARGS_1 /* nothing */
+#define UNDOARGS_2 /* nothing */
+#define UNDOARGS_3 /* nothing */
+#define UNDOARGS_4 /* nothing */
+#define UNDOARGS_5 /* nothing */
+#define UNDOARGS_6 /* nothing */
+
+#else
+
+/* GCC has to be warned that a syscall may clobber all the ABI
+   registers listed as "caller-saves", see page 8, Table 2
+   in section 2.2.6 of the PA-RISC RUN-TIME architecture
+   document. However! r28 is the result and will conflict with
+   the clobber list so it is left out. Also the input arguments
+   registers r20 -> r26 will conflict with the list so they
+   are treated specially. Although r19 is clobbered by the syscall
+   we cannot say this because it would violate ABI, thus we say
+   r4 is clobbered and use that register to save/restore r19
+   across the syscall. */
+
+#define CALL_CLOB_REGS	"%r1", "%r2", USING_GR4 \
+		 	"%r20", "%r29", "%r31"
+
+#undef INLINE_SYSCALL
+#define INLINE_SYSCALL(name, nr, args...)	({			\
+	long __sys_res;							\
+	{								\
+		register unsigned long __res asm("r28");		\
+		LOAD_ARGS_##nr(args)					\
+		/* FIXME: HACK stw/ldw r19 around syscall */		\
+		asm volatile(						\
+			STW_ASM_PIC					\
+			"	ble  0x100(%%sr2, %%r0)\n"		\
+			"	ldi %1, %%r20\n"			\
+			LDW_ASM_PIC					\
+			: "=r" (__res)					\
+			: "i" (SYS_ify(name)) ASM_ARGS_##nr		\
+			: CALL_CLOB_REGS CLOB_ARGS_##nr			\
+		);							\
+		__sys_res = (long)__res;				\
+	}								\
+	if ( (unsigned long)__sys_res >= (unsigned long)-4095 ){	\
+		__set_errno(-__sys_res);				\
+		__sys_res = -1;						\
+	}								\
+	__sys_res;							\
+})
+
+/* INTERNAL_SYSCALL_DECL - Allows us to setup some function static
+   value to use within the context of the syscall
+   INTERNAL_SYSCALL_ERROR_P - Returns 0 if it wasn't an error, 1 otherwise
+   You are allowed to use the syscall result (val) and the DECL error variable
+   to determine what went wrong.
+   INTERLAL_SYSCALL_ERRNO - Munges the val/err pair into the error number.
+   In our case we just flip the sign. */
+
+#undef INTERNAL_SYSCALL_DECL
+#define INTERNAL_SYSCALL_DECL(err) do { } while (0)
+
+/* Equivalent to  (val < 0)&&(val > -4095) which is what we want */
+#undef INTERNAL_SYSCALL_ERROR_P
+#define INTERNAL_SYSCALL_ERROR_P(val, err) \
+	((unsigned long)val >= (unsigned long)-4095)
+
+#undef INTERNAL_SYSCALL_ERRNO
+#define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
+
+/* Similar to INLINE_SYSCALL but we don't set errno */
+#undef INTERNAL_SYSCALL
+#define INTERNAL_SYSCALL(name, err, nr, args...) 		\
+({								\
+	long __sys_res;						\
+	{							\
+		register unsigned long __res asm("r28");	\
+		LOAD_ARGS_##nr(args)				\
+		/* FIXME: HACK stw/ldw r19 around syscall */	\
+		asm volatile(					\
+			STW_ASM_PIC				\
+			"	ble  0x100(%%sr2, %%r0)\n"	\
+			"	ldi %1, %%r20\n"		\
+			LDW_ASM_PIC				\
+			: "=r" (__res)				\
+			: "i" (SYS_ify(name)) ASM_ARGS_##nr	\
+			: CALL_CLOB_REGS CLOB_ARGS_##nr		\
+		);						\
+		__sys_res = (long)__res;			\
+	}							\
+	__sys_res;						\
+ })
+
+#define LOAD_ARGS_0()
+#define LOAD_ARGS_1(r26)					\
+	register unsigned long __r26 __asm__("r26") = (unsigned long)(r26);   \
+	LOAD_ARGS_0()
+#define LOAD_ARGS_2(r26,r25)					\
+	register unsigned long __r25 __asm__("r25") = (unsigned long)(r25);   \
+	LOAD_ARGS_1(r26)
+#define LOAD_ARGS_3(r26,r25,r24)				\
+	register unsigned long __r24 __asm__("r24") = (unsigned long)(r24);   \
+	LOAD_ARGS_2(r26,r25)
+#define LOAD_ARGS_4(r26,r25,r24,r23)				\
+	register unsigned long __r23 __asm__("r23") = (unsigned long)(r23);   \
+	LOAD_ARGS_3(r26,r25,r24)
+#define LOAD_ARGS_5(r26,r25,r24,r23,r22)			\
+	register unsigned long __r22 __asm__("r22") = (unsigned long)(r22);   \
+	LOAD_ARGS_4(r26,r25,r24,r23)
+#define LOAD_ARGS_6(r26,r25,r24,r23,r22,r21)			\
+	register unsigned long __r21 __asm__("r21") = (unsigned long)(r21);   \
+	LOAD_ARGS_5(r26,r25,r24,r23,r22)
+
+/* Even with zero args we use r20 for the syscall number */
+#define ASM_ARGS_0
+#define ASM_ARGS_1 ASM_ARGS_0, "r" (__r26)
+#define ASM_ARGS_2 ASM_ARGS_1, "r" (__r25)
+#define ASM_ARGS_3 ASM_ARGS_2, "r" (__r24)
+#define ASM_ARGS_4 ASM_ARGS_3, "r" (__r23)
+#define ASM_ARGS_5 ASM_ARGS_4, "r" (__r22)
+#define ASM_ARGS_6 ASM_ARGS_5, "r" (__r21)
+
+/* The registers not listed as inputs but clobbered */
+#define CLOB_ARGS_6
+#define CLOB_ARGS_5 CLOB_ARGS_6, "%r21"
+#define CLOB_ARGS_4 CLOB_ARGS_5, "%r22"
+#define CLOB_ARGS_3 CLOB_ARGS_4, "%r23"
+#define CLOB_ARGS_2 CLOB_ARGS_3, "%r24"
+#define CLOB_ARGS_1 CLOB_ARGS_2, "%r25"
+#define CLOB_ARGS_0 CLOB_ARGS_1, "%r26"
+
+#endif	/* __ASSEMBLER__ */