alpha: Refactor syscall and Use Linux kABI for syscall return

It highly unlikely that alpha will be ported to anything else than
Linux, so this patch moves the generic unix syscall definition to
Linux and adapt it to Linux kernel ABI.

It changes the internal_syscall* macros to return a negative value
instead of the '$19' register value on the 'err' macro argument.

The macro INTERNAL_SYSCALL_DECL is no longer required, and the
INTERNAL_SYSCALL_ERROR_P macro follows the other Linux kABIs.

Checked on alpha-linux-gnu.

1 files changed, 347 insertions, 7 deletions

diff --git a/sysdeps/unix/sysv/linux/alpha/sysdep.h b/sysdeps/unix/sysv/linux/alpha/sysdep.h
index f8c9e589ec..218e207e50 100644
--- a/sysdeps/unix/sysv/linux/alpha/sysdep.h
+++ b/sysdeps/unix/sysv/linux/alpha/sysdep.h
@@ -19,14 +19,10 @@
 #ifndef _LINUX_ALPHA_SYSDEP_H
 #define _LINUX_ALPHA_SYSDEP_H 1
 
-#ifdef __ASSEMBLER__
-#include <asm/pal.h>
-#include <alpha/regdef.h>
-#endif
-
 /* There is some commonality.  */
 #include <sysdeps/unix/sysv/linux/sysdep.h>
-#include <sysdeps/unix/alpha/sysdep.h>
+#include <sysdeps/unix/sysdep.h>
+#include <dl-sysdep.h>         /* Defines RTLD_PRIVATE_ERRNO.  */
 
 #include <tls.h>
 
@@ -39,4 +35,348 @@
 
 #define SINGLE_THREAD_BY_GLOBAL 1
 
-#endif /* _LINUX_ALPHA_SYSDEP_H */
+#ifdef __ASSEMBLER__
+#include <asm/pal.h>
+#include <alpha/regdef.h>
+
+#define __LABEL(x)	x##:
+
+#define LEAF(name, framesize)			\
+  .globl name;					\
+  .align 4;					\
+  .ent name, 0;					\
+  __LABEL(name)					\
+  .frame sp, framesize, ra
+
+#define ENTRY(name)				\
+  .globl name;					\
+  .align 4;					\
+  .ent name, 0;					\
+  __LABEL(name)					\
+  .frame sp, 0, ra
+
+/* Mark the end of function SYM.  */
+#undef END
+#define END(sym)	.end sym
+
+#ifdef PROF
+# define PSEUDO_PROF				\
+	.set noat;				\
+	lda	AT, _mcount;			\
+	jsr	AT, (AT), _mcount;		\
+	.set at
+#else
+# define PSEUDO_PROF
+#endif
+
+#ifdef PROF
+# define PSEUDO_PROLOGUE			\
+	.frame sp, 0, ra;			\
+	ldgp	gp,0(pv);			\
+	PSEUDO_PROF;				\
+	.prologue 1
+#elif defined PIC
+# define PSEUDO_PROLOGUE			\
+	.frame sp, 0, ra;			\
+	.prologue 0
+#else
+# define PSEUDO_PROLOGUE			\
+	.frame sp, 0, ra;			\
+	ldgp	gp,0(pv);			\
+	.prologue 1
+#endif /* PROF */
+
+#ifdef PROF
+# define USEPV_PROF	std
+#else
+# define USEPV_PROF	no
+#endif
+
+#if RTLD_PRIVATE_ERRNO
+# define SYSCALL_ERROR_LABEL	$syscall_error
+# define SYSCALL_ERROR_HANDLER			\
+$syscall_error:					\
+	stl	v0, rtld_errno(gp)	!gprel;	\
+	lda	v0, -1;				\
+	ret
+# define SYSCALL_ERROR_FALLTHRU
+#elif defined(PIC)
+# define SYSCALL_ERROR_LABEL		__syscall_error !samegp
+# define SYSCALL_ERROR_HANDLER
+# define SYSCALL_ERROR_FALLTHRU		br SYSCALL_ERROR_LABEL
+#else
+# define SYSCALL_ERROR_LABEL		$syscall_error
+# define SYSCALL_ERROR_HANDLER			\
+$syscall_error:					\
+	jmp $31, __syscall_error
+# define SYSCALL_ERROR_FALLTHRU
+#endif /* RTLD_PRIVATE_ERRNO */
+
+/* Overridden by specific syscalls.  */
+#undef PSEUDO_PREPARE_ARGS
+#define PSEUDO_PREPARE_ARGS	/* Nothing.  */
+
+#define PSEUDO(name, syscall_name, args)	\
+	.globl name;				\
+	.align 4;				\
+	.ent name,0;				\
+__LABEL(name)					\
+	PSEUDO_PROLOGUE;			\
+	PSEUDO_PREPARE_ARGS			\
+	lda	v0, SYS_ify(syscall_name);	\
+	call_pal PAL_callsys;			\
+	bne	a3, SYSCALL_ERROR_LABEL
+
+#undef PSEUDO_END
+#define PSEUDO_END(sym)				\
+	SYSCALL_ERROR_HANDLER;			\
+	END(sym)
+
+#define PSEUDO_NOERRNO(name, syscall_name, args)	\
+	.globl name;					\
+	.align 4;					\
+	.ent name,0;					\
+__LABEL(name)						\
+	PSEUDO_PROLOGUE;				\
+	PSEUDO_PREPARE_ARGS				\
+	lda	v0, SYS_ify(syscall_name);		\
+	call_pal PAL_callsys;
+
+#undef PSEUDO_END_NOERRNO
+#define PSEUDO_END_NOERRNO(sym)  END(sym)
+
+#define ret_NOERRNO ret
+
+#define PSEUDO_ERRVAL(name, syscall_name, args)	\
+	.globl name;					\
+	.align 4;					\
+	.ent name,0;					\
+__LABEL(name)						\
+	PSEUDO_PROLOGUE;				\
+	PSEUDO_PREPARE_ARGS				\
+	lda	v0, SYS_ify(syscall_name);		\
+	call_pal PAL_callsys;
+
+#undef PSEUDO_END_ERRVAL
+#define PSEUDO_END_ERRVAL(sym)  END(sym)
+
+#define ret_ERRVAL ret
+
+#define r0	v0
+#define r1	a4
+
+#define MOVE(x,y)	mov x,y
+
+#else /* !ASSEMBLER */
+
+/* In order to get __set_errno() definition in INLINE_SYSCALL.  */
+#include <errno.h>
+
+#undef INLINE_SYSCALL
+#define INLINE_SYSCALL(name, nr, args...)				\
+({									\
+	INTERNAL_SYSCALL_DECL (_sc_err);				\
+	long int _sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, args);	\
+	if (INTERNAL_SYSCALL_ERROR_P (_sc_ret, _sc_err))		\
+	  {								\
+	    __set_errno (INTERNAL_SYSCALL_ERRNO (_sc_ret, _sc_err));	\
+	    _sc_ret = -1L;						\
+	  }								\
+	_sc_ret;							\
+})
+
+#define INTERNAL_SYSCALL(name, err_out, nr, args...) \
+	internal_syscall##nr(__NR_##name, args)
+
+#define INTERNAL_SYSCALL_NCS(name, err_out, nr, args...) \
+	internal_syscall##nr(name, args)
+
+#define INTERNAL_SYSCALL_DECL(err) do { } while (0)
+
+/* The normal Alpha calling convention sign-extends 32-bit quantties
+   no matter what the "real" sign of the 32-bit type.  We want to
+   preserve that when filling in values for the kernel.  */
+#define syscall_promote(arg) \
+  (sizeof (arg) == 4 ? (long int)(int)(long int)(arg) : (long int)(arg))
+
+/* Make sure and "use" the variable that we're not returning,
+   in order to suppress unused variable warnings.  */
+#define INTERNAL_SYSCALL_ERROR_P(val, err) \
+	((unsigned long) (val) > -4096UL)
+#define INTERNAL_SYSCALL_ERRNO(val, err)	(-(val))
+
+#define internal_syscall_clobbers				\
+	"$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",	\
+	"$22", "$23", "$24", "$25", "$27", "$28", "memory"
+
+/* It is moderately important optimization-wise to limit the lifetime
+   of the hard-register variables as much as possible.  Thus we copy
+   in/out as close to the asm as possible.  */
+
+#define internal_syscall0(name, args...)			\
+({								\
+	register long int _sc_19 __asm__("$19");		\
+	register long int _sc_0 = name;				\
+	__asm__ __volatile__					\
+	  ("callsys # %0 %1 <= %2"				\
+	   : "+v"(_sc_0), "=r"(_sc_19)				\
+	   : : internal_syscall_clobbers,			\
+	     "$16", "$17", "$18", "$20", "$21");		\
+	_sc_19 != 0 ? -_sc_0 : _sc_0;				\
+})
+
+#define internal_syscall1(name,arg1)				\
+({								\
+	register long int _tmp_16 = syscall_promote (arg1);	\
+	register long int _sc_0 = name;				\
+	register long int _sc_16 __asm__("$16") = _tmp_16;	\
+	register long int _sc_19 __asm__("$19");		\
+	__asm__ __volatile__					\
+	  ("callsys # %0 %1 <= %2 %3"				\
+	   : "+v"(_sc_0), "=r"(_sc_19), "+r"(_sc_16)		\
+	   : : internal_syscall_clobbers,			\
+	     "$17", "$18", "$20", "$21");			\
+	_sc_19 != 0 ? -_sc_0 : _sc_0;				\
+})
+
+#define internal_syscall2(name,arg1,arg2)			\
+({								\
+	register long int _tmp_16 = syscall_promote (arg1);	\
+	register long int _tmp_17 = syscall_promote (arg2);	\
+	register long int _sc_0 = name;				\
+	register long int _sc_16 __asm__("$16") = _tmp_16;	\
+	register long int _sc_17 __asm__("$17") = _tmp_17;	\
+	register long int _sc_19 __asm__("$19");		\
+	__asm__ __volatile__					\
+	  ("callsys # %0 %1 <= %2 %3 %4"			\
+	   : "+v"(_sc_0), "=r"(_sc_19),				\
+	     "+r"(_sc_16), "+r"(_sc_17)				\
+	   : : internal_syscall_clobbers,			\
+	     "$18", "$20", "$21");				\
+	_sc_19 != 0 ? -_sc_0 : _sc_0;				\
+})
+
+#define internal_syscall3(name,arg1,arg2,arg3)			\
+({								\
+	register long int _tmp_16 = syscall_promote (arg1);	\
+	register long int _tmp_17 = syscall_promote (arg2);	\
+	register long int _tmp_18 = syscall_promote (arg3);	\
+	register long int _sc_0 = name;				\
+	register long int _sc_16 __asm__("$16") = _tmp_16;	\
+	register long int _sc_17 __asm__("$17") = _tmp_17;	\
+	register long int _sc_18 __asm__("$18") = _tmp_18;	\
+	register long int _sc_19 __asm__("$19");		\
+	__asm__ __volatile__					\
+	  ("callsys # %0 %1 <= %2 %3 %4 %5"			\
+	   : "+v"(_sc_0), "=r"(_sc_19), "+r"(_sc_16),		\
+	     "+r"(_sc_17), "+r"(_sc_18)				\
+	   : : internal_syscall_clobbers, "$20", "$21");	\
+	_sc_19 != 0 ? -_sc_0 : _sc_0;				\
+})
+
+#define internal_syscall4(name,arg1,arg2,arg3,arg4)		\
+({								\
+	register long int _tmp_16 = syscall_promote (arg1);	\
+	register long int _tmp_17 = syscall_promote (arg2);	\
+	register long int _tmp_18 = syscall_promote (arg3);	\
+	register long int _tmp_19 = syscall_promote (arg4);	\
+	register long int _sc_0 = name;				\
+	register long int _sc_16 __asm__("$16") = _tmp_16;	\
+	register long int _sc_17 __asm__("$17") = _tmp_17;	\
+	register long int _sc_18 __asm__("$18") = _tmp_18;	\
+	register long int _sc_19 __asm__("$19") = _tmp_19;	\
+	__asm__ __volatile__					\
+	  ("callsys # %0 %1 <= %2 %3 %4 %5 %6"			\
+	   : "+v"(_sc_0), "+r"(_sc_19), "+r"(_sc_16),		\
+	     "+r"(_sc_17), "+r"(_sc_18)				\
+	   : : internal_syscall_clobbers, "$20", "$21");	\
+	_sc_19 != 0 ? -_sc_0 : _sc_0;				\
+})
+
+#define internal_syscall5(name,arg1,arg2,arg3,arg4,arg5)	\
+({								\
+	register long int _tmp_16 = syscall_promote (arg1);	\
+	register long int _tmp_17 = syscall_promote (arg2);	\
+	register long int _tmp_18 = syscall_promote (arg3);	\
+	register long int _tmp_19 = syscall_promote (arg4);	\
+	register long int _tmp_20 = syscall_promote (arg5);	\
+	register long int _sc_0 = name;				\
+	register long int _sc_16 __asm__("$16") = _tmp_16;	\
+	register long int _sc_17 __asm__("$17") = _tmp_17;	\
+	register long int _sc_18 __asm__("$18") = _tmp_18;	\
+	register long int _sc_19 __asm__("$19") = _tmp_19;	\
+	register long int _sc_20 __asm__("$20") = _tmp_20;	\
+	__asm__ __volatile__					\
+	  ("callsys # %0 %1 <= %2 %3 %4 %5 %6 %7"		\
+	   : "+v"(_sc_0), "+r"(_sc_19), "+r"(_sc_16),		\
+	     "+r"(_sc_17), "+r"(_sc_18), "+r"(_sc_20)		\
+	   : : internal_syscall_clobbers, "$21");		\
+	_sc_19 != 0 ? -_sc_0 : _sc_0;				\
+})
+
+#define internal_syscall6(name,arg1,arg2,arg3,arg4,arg5,arg6)	\
+({								\
+	register long int _tmp_16 = syscall_promote (arg1);	\
+	register long int _tmp_17 = syscall_promote (arg2);	\
+	register long int _tmp_18 = syscall_promote (arg3);	\
+	register long int _tmp_19 = syscall_promote (arg4);	\
+	register long int _tmp_20 = syscall_promote (arg5);	\
+	register long int _tmp_21 = syscall_promote (arg6);	\
+	register long int _sc_0 = name;				\
+	register long int _sc_16 __asm__("$16") = _tmp_16;	\
+	register long int _sc_17 __asm__("$17") = _tmp_17;	\
+	register long int _sc_18 __asm__("$18") = _tmp_18;	\
+	register long int _sc_19 __asm__("$19") = _tmp_19;	\
+	register long int _sc_20 __asm__("$20") = _tmp_20;	\
+	register long int _sc_21 __asm__("$21") = _tmp_21;	\
+	__asm__ __volatile__					\
+	  ("callsys # %0 %1 <= %2 %3 %4 %5 %6 %7 %8"		\
+	   : "+v"(_sc_0), "+r"(_sc_19), "+r"(_sc_16),		\
+	     "+r"(_sc_17), "+r"(_sc_18), "+r"(_sc_20),		\
+	     "+r"(_sc_21)					\
+	   : : internal_syscall_clobbers);			\
+	_sc_19 != 0 ? -_sc_0 : _sc_0;				\
+})
+#endif /* ASSEMBLER */
+
+/* Pointer mangling support.  Note that tls access is slow enough that
+   we don't deoptimize things by placing the pointer check value there.  */
+
+#ifdef __ASSEMBLER__
+# if IS_IN (rtld)
+#  define PTR_MANGLE(dst, src, tmp)				\
+	ldah	tmp, __pointer_chk_guard_local($29) !gprelhigh;	\
+	ldq	tmp, __pointer_chk_guard_local(tmp) !gprellow;	\
+	xor	src, tmp, dst
+#  define PTR_MANGLE2(dst, src, tmp)				\
+	xor	src, tmp, dst
+# elif defined SHARED
+#  define PTR_MANGLE(dst, src, tmp)		\
+	ldq	tmp, __pointer_chk_guard;	\
+	xor	src, tmp, dst
+# else
+#  define PTR_MANGLE(dst, src, tmp)		\
+	ldq	tmp, __pointer_chk_guard_local;	\
+	xor	src, tmp, dst
+# endif
+# define PTR_MANGLE2(dst, src, tmp)		\
+	xor	src, tmp, dst
+# define PTR_DEMANGLE(dst, tmp)   PTR_MANGLE(dst, dst, tmp)
+# define PTR_DEMANGLE2(dst, tmp)  PTR_MANGLE2(dst, dst, tmp)
+#else
+# include <stdint.h>
+# if (IS_IN (rtld) \
+      || (!defined SHARED && (IS_IN (libc) \
+			      || IS_IN (libpthread))))
+extern uintptr_t __pointer_chk_guard_local attribute_relro attribute_hidden;
+#  define PTR_MANGLE(var) \
+	(var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard_local)
+# else
+extern uintptr_t __pointer_chk_guard attribute_relro;
+#  define PTR_MANGLE(var) \
+	(var) = (__typeof(var)) ((uintptr_t) (var) ^ __pointer_chk_guard)
+# endif
+# define PTR_DEMANGLE(var)  PTR_MANGLE(var)
+#endif /* ASSEMBLER */
+
+#endif /* _LINUX_ALPHA_SYSDEP_H  */