mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-19 11:30:06 +00:00
213 lines
9.1 KiB
C
213 lines
9.1 KiB
C
|
/* Copyright (C) 2000 Free Software Foundation, Inc.
|
||
|
|
Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
|
||
|
|
This file is part of the GNU C Library.
|
||
|
|
|
||
|
|
The GNU C Library is free software; you can redistribute it and/or
|
||
|
|
modify it under the terms of the GNU Library General Public License as
|
||
|
|
published by the Free Software Foundation; either version 2 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
|
||
|
|
Library General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Library General Public
|
||
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
||
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
||
|
|
Boston, MA 02111-1307, USA. */
|
||
|
|
|
||
|
|
#ifndef _LINUX_S390_SYSDEP_H
|
||
|
|
#define _LINUX_S390_SYSEDP_H
|
||
|
|
|
||
|
|
#include <sysdeps/s390/sysdep.h>
|
||
|
|
#include <sysdeps/unix/sysdep.h>
|
||
|
|
|
||
|
|
/* 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. */
|
||
|
|
/* in newer 2.1 kernels __NR_syscall is missing so we define it here */
|
||
|
|
#define __NR_syscall 0
|
||
|
|
|
||
|
|
#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
|
||
|
|
|
||
|
|
#ifdef __ASSEMBLER__
|
||
|
|
|
||
|
|
/* 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 gpr2 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 savely test with -4095. */
|
||
|
|
|
||
|
|
#define SYSCALL_ERROR_LABEL 0f
|
||
|
|
|
||
|
|
#undef PSEUDO
|
||
|
|
#define PSEUDO(name, syscall_name, args) \
|
||
|
|
.text; \
|
||
|
|
ENTRY (name) \
|
||
|
|
DO_CALL (args, syscall_name); \
|
||
|
|
lhi %r4,-4095 ; \
|
||
|
|
clr %r2,%r4 ; \
|
||
|
|
jnl SYSCALL_ERROR_LABEL ; \
|
||
|
|
L(pseudo_end):
|
||
|
|
|
||
|
|
#undef PSEUDO_END
|
||
|
|
#define PSEUDO_END(name) \
|
||
|
|
SYSCALL_ERROR_HANDLER; \
|
||
|
|
END (name)
|
||
|
|
|
||
|
|
#ifndef _LIBC_REENTRANT
|
||
|
|
#ifndef PIC
|
||
|
|
#define SYSCALL_ERROR_HANDLER \
|
||
|
|
0: lcr %r2,%r2 ; \
|
||
|
|
basr %r1,0 ; \
|
||
|
|
1: l %r1,2f-1b(%r1) \
|
||
|
|
st %r2,0(%r1) \
|
||
|
|
lhi %r2,-1 \
|
||
|
|
br %r14 \
|
||
|
|
2: .long errno
|
||
|
|
#else
|
||
|
|
#define SYSCALL_ERROR_HANDLER \
|
||
|
|
0: basr %r1,0 ; \
|
||
|
|
1: al %r1,2f-1b(%r1) ; \
|
||
|
|
l %r1,errno@GOT12(%r1) ; \
|
||
|
|
lcr %r2,%r2 ; \
|
||
|
|
st %r2,0(%r1) ; \
|
||
|
|
lhi %r2,-1 ; \
|
||
|
|
br %r14 ; \
|
||
|
|
2: .long _GLOBAL_OFFSET_TABLE_-1b
|
||
|
|
#endif /* PIC */
|
||
|
|
#else
|
||
|
|
#define SYSCALL_ERROR_HANDLER \
|
||
|
|
0: basr %r1,0 ; \
|
||
|
|
1: al %r1,2f-1b(%r1) ; \
|
||
|
|
br %r1 ; \
|
||
|
|
2: .long __syscall_error@PLT-1b
|
||
|
|
#endif /* _LIBC_REENTRANT */
|
||
|
|
|
||
|
|
/* Linux takes system call arguments in registers:
|
||
|
|
|
||
|
|
syscall number 1 call-clobbered
|
||
|
|
arg 1 2 call-clobbered
|
||
|
|
arg 2 3 call-clobbered
|
||
|
|
arg 3 4 call-clobbered
|
||
|
|
arg 4 5 call-clobbered
|
||
|
|
arg 5 6 call-saved
|
||
|
|
|
||
|
|
(Of course a function with say 3 arguments does not have entries for
|
||
|
|
arguments 4 and 5.)
|
||
|
|
S390 does not need to do ANY stack operations to get its parameters
|
||
|
|
right.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define DO_CALL(args, syscall) \
|
||
|
|
svc SYS_ify (syscall)
|
||
|
|
|
||
|
|
#define ret \
|
||
|
|
br 14
|
||
|
|
|
||
|
|
#endif /* __ASSEMBLER__ */
|
||
|
|
|
||
|
|
#undef INLINE_SYSCALL
|
||
|
|
#define INLINE_SYSCALL(name, nr, args...) \
|
||
|
|
({ \
|
||
|
|
DECLARGS_##nr(args) \
|
||
|
|
int err; \
|
||
|
|
asm volatile ( \
|
||
|
|
LOADARGS_##nr \
|
||
|
|
"svc %b1\n\t" \
|
||
|
|
"lr %0,%%r2\n\t" \
|
||
|
|
: "=d" (err) \
|
||
|
|
: "I" (__NR_##name) ASMFMT_##nr \
|
||
|
|
: "memory", "cc", "2", "3", "4", "5", "6"); \
|
||
|
|
if (err >= 0xfffff001) \
|
||
|
|
{ \
|
||
|
|
__set_errno(-err); \
|
||
|
|
err = 0xffffffff; \
|
||
|
|
} \
|
||
|
|
(int) err; })
|
||
|
|
|
||
|
|
#define DECLARGS_0()
|
||
|
|
#define DECLARGS_1(arg1) \
|
||
|
|
unsigned int gpr2 = (unsigned int) (arg1);
|
||
|
|
#define DECLARGS_2(arg1, arg2) \
|
||
|
|
DECLARGS_1(arg1) \
|
||
|
|
unsigned int gpr3 = (unsigned int) (arg2);
|
||
|
|
#define DECLARGS_3(arg1, arg2, arg3) \
|
||
|
|
DECLARGS_2(arg1, arg2) \
|
||
|
|
unsigned int gpr4 = (unsigned int) (arg3);
|
||
|
|
#define DECLARGS_4(arg1, arg2, arg3, arg4) \
|
||
|
|
DECLARGS_3(arg1, arg2, arg3) \
|
||
|
|
unsigned int gpr5 = (unsigned int) (arg4);
|
||
|
|
#define DECLARGS_5(arg1, arg2, arg3, arg4, arg5) \
|
||
|
|
DECLARGS_4(arg1, arg2, arg3, arg4) \
|
||
|
|
unsigned int gpr6 = (unsigned int) (arg5);
|
||
|
|
|
||
|
|
#define LOADARGS_0
|
||
|
|
#define LOADARGS_1 "L 2,%2\n\t"
|
||
|
|
#define LOADARGS_2 LOADARGS_1 "L 3,%3\n\t"
|
||
|
|
#define LOADARGS_3 LOADARGS_2 "L 4,%4\n\t"
|
||
|
|
#define LOADARGS_4 LOADARGS_3 "L 5,%5\n\t"
|
||
|
|
#define LOADARGS_5 LOADARGS_4 "L 6,%6\n\t"
|
||
|
|
|
||
|
|
#define ASMFMT_0
|
||
|
|
#define ASMFMT_1 , "m" (gpr2)
|
||
|
|
#define ASMFMT_2 , "m" (gpr2), "m" (gpr3)
|
||
|
|
#define ASMFMT_3 , "m" (gpr2), "m" (gpr3), "m" (gpr4)
|
||
|
|
#define ASMFMT_4 , "m" (gpr2), "m" (gpr3), "m" (gpr4), "m" (gpr5)
|
||
|
|
#define ASMFMT_5 , "m" (gpr2), "m" (gpr3), "m" (gpr4), "m" (gpr5), "m" (gpr6)
|
||
|
|
|
||
|
|
#if 0
|
||
|
|
#undef INLINE_SYSCALL
|
||
|
|
#define INLINE_SYSCALL(name, nr, args...) \
|
||
|
|
({ \
|
||
|
|
DECLARGS_##nr(args) \
|
||
|
|
asm volatile ( \
|
||
|
|
"svc %b1\n\t" \
|
||
|
|
: "+d" (gpr2) \
|
||
|
|
: "I" (__NR_##name) ASMFMT_##nr : "memory", "cc"); \
|
||
|
|
if (gpr2 >= 0xfffff001) \
|
||
|
|
{ \
|
||
|
|
__set_errno(-gpr2); \
|
||
|
|
gpr2 = 0xffffffff; \
|
||
|
|
} \
|
||
|
|
(int) gpr2; })
|
||
|
|
|
||
|
|
#define DECLARGS_0() \
|
||
|
|
register unsigned int gpr2 asm("2");
|
||
|
|
#define DECLARGS_1(arg1) \
|
||
|
|
register unsigned int gpr2 asm("2") = (unsigned int) (arg1);
|
||
|
|
#define DECLARGS_2(arg1, arg2) \
|
||
|
|
DECLARGS_1(arg1) \
|
||
|
|
register unsigned int gpr3 asm("3") = (unsigned int) (arg2);
|
||
|
|
#define DECLARGS_3(arg1, arg2, arg3) \
|
||
|
|
DECLARGS_2(arg1, arg2) \
|
||
|
|
register unsigned int gpr4 asm("4") = (unsigned int) (arg3);
|
||
|
|
#define DECLARGS_4(arg1, arg2, arg3, arg4) \
|
||
|
|
DECLARGS_3(arg1, arg2, arg3) \
|
||
|
|
register unsigned int gpr5 asm("5") = (unsigned int) (arg4);
|
||
|
|
#define DECLARGS_5(arg1, arg2, arg3, arg4, arg5) \
|
||
|
|
DECLARGS_4(arg1, arg2, arg3, arg4) \
|
||
|
|
register unsigned int gpr6 asm("6") = (unsigned int) (arg5);
|
||
|
|
|
||
|
|
#define ASMFMT_0
|
||
|
|
#define ASMFMT_1
|
||
|
|
#define ASMFMT_2 , "d" (gpr3)
|
||
|
|
#define ASMFMT_3 , "d" (gpr3), "d" (gpr4)
|
||
|
|
#define ASMFMT_4 , "d" (gpr3), "d" (gpr4), "d" (gpr5)
|
||
|
|
#define ASMFMT_5 , "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6)
|
||
|
|
|
||
|
|
#endif /* 0 */
|
||
|
|
|
||
|
|
#endif /* _LINUX_S390_SYSDEP_H */
|