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Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h')
| -rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h | 345 |
1 files changed, 345 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h b/REORG.TODO/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h new file mode 100644 index 0000000000..e22d9b6b13 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h @@ -0,0 +1,345 @@ +/* Assembler macros for 64 bit S/390. + Copyright (C) 2001-2017 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 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, see + <http://www.gnu.org/licenses/>. */ + +#ifndef _LINUX_S390_SYSDEP_H +#define _LINUX_S390_SYSDEP_H + +#include <sysdeps/s390/s390-64/sysdep.h> +#include <sysdeps/unix/sysdep.h> +#include <sysdeps/unix/sysv/linux/sysdep.h> +#include <dl-sysdep.h> /* For RTLD_PRIVATE_ERRNO. */ +#include <tls.h> + +/* Define __set_errno() for INLINE_SYSCALL macro below. */ +#ifndef __ASSEMBLER__ +#include <errno.h> +#endif + +/* 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 + +/* + * Newer kernel versions redefined __NR_pread and __NR_pwrite to + * __NR_pread64 and __NR_pwrite64. + */ +#ifndef __NR_pread +# define __NR_pread __NR_pread64 +#endif +#ifndef __NR_pwrite +# define __NR_pwrite __NR_pwrite64 +#endif + +#undef SYS_ify +#define SYS_ify(syscall_name) __NR_##syscall_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 that no syscall returns a value + in -1 .. -4095 as a valid result so we can savely test with -4095. */ + +#undef PSEUDO +#define PSEUDO(name, syscall_name, args) \ + .text; \ + ENTRY (name) \ + DO_CALL (syscall_name, args); \ + lghi %r4,-4095 ; \ + clgr %r2,%r4 ; \ + jgnl SYSCALL_ERROR_LABEL + +#undef PSEUDO_END +#define PSEUDO_END(name) \ + SYSCALL_ERROR_HANDLER; \ + END (name) + +#undef PSEUDO_NOERRNO +#define PSEUDO_NOERRNO(name, syscall_name, args) \ + .text; \ + ENTRY (name) \ + DO_CALL (syscall_name, args) + +#undef PSEUDO_END_NOERRNO +#define PSEUDO_END_NOERRNO(name) \ + SYSCALL_ERROR_HANDLER; \ + END (name) + +#undef PSEUDO_ERRVAL +#define PSEUDO_ERRVAL(name, syscall_name, args) \ + .text; \ + ENTRY (name) \ + DO_CALL (syscall_name, args); \ + lcgr %r2,%r2 + +#undef PSEUDO_END_ERRVAL +#define PSEUDO_END_ERRVAL(name) \ + SYSCALL_ERROR_HANDLER; \ + END (name) + +#ifndef PIC +# define SYSCALL_ERROR_LABEL syscall_error +# define SYSCALL_ERROR_HANDLER +#else +# if RTLD_PRIVATE_ERRNO +# define SYSCALL_ERROR_LABEL 0f +# define SYSCALL_ERROR_HANDLER \ +0: larl %r1,rtld_errno; \ + lcr %r2,%r2; \ + st %r2,0(%r1); \ + lghi %r2,-1; \ + br %r14 +# elif defined _LIBC_REENTRANT +# if IS_IN (libc) +# define SYSCALL_ERROR_ERRNO __libc_errno +# else +# define SYSCALL_ERROR_ERRNO errno +# endif +# define SYSCALL_ERROR_LABEL 0f +# define SYSCALL_ERROR_HANDLER \ +0: lcr %r0,%r2; \ + larl %r1,SYSCALL_ERROR_ERRNO@indntpoff; \ + lg %r1,0(%r1); \ + ear %r2,%a0; \ + sllg %r2,%r2,32; \ + ear %r2,%a1; \ + st %r0,0(%r1,%r2); \ + lghi %r2,-1; \ + br %r14 +# else +# define SYSCALL_ERROR_LABEL 0f +# define SYSCALL_ERROR_HANDLER \ +0: larl %r1,_GLOBAL_OFFSET_TABLE_; \ + lg %r1,errno@GOT(%r1); \ + lcr %r2,%r2; \ + st %r2,0(%r1); \ + lghi %r2,-1; \ + br %r14 +# endif /* _LIBC_REENTRANT */ +#endif /* PIC */ + +/* 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 + arg 6 7 call-saved + + (Of course a function with say 3 arguments does not have entries for + arguments 4 and 5.) + For system calls with 6 parameters a stack operation is required + to load the 6th parameter to register 7. Call saved register 7 is + moved to register 0 and back to avoid an additional stack frame. + */ + +#define DO_CALL(syscall, args) \ + .if args > 5; \ + lgr %r0,%r7; \ + lg %r7,160(%r15); \ + .endif; \ + .if SYS_ify (syscall) < 256; \ + svc SYS_ify (syscall); \ + .else; \ + lghi %r1,SYS_ify (syscall); \ + svc 0; \ + .endif; \ + .if args > 5; \ + lgr %r7,%r0; \ + .endif + +#define ret \ + br 14 + +#define ret_NOERRNO \ + br 14 + +#define ret_ERRVAL \ + br 14 + +#endif /* __ASSEMBLER__ */ + +#undef INLINE_SYSCALL +#define INLINE_SYSCALL(name, nr, args...) \ + ({ \ + long _ret = INTERNAL_SYSCALL (name, , nr, args); \ + if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (_ret, ))) \ + { \ + __set_errno (INTERNAL_SYSCALL_ERRNO (_ret, )); \ + _ret = -1; \ + } \ + _ret; }) + +#undef INTERNAL_SYSCALL_DECL +#define INTERNAL_SYSCALL_DECL(err) do { } while (0) + +#undef INTERNAL_SYSCALL_DIRECT +#define INTERNAL_SYSCALL_DIRECT(name, err, nr, args...) \ + ({ \ + DECLARGS_##nr(args) \ + register long _ret __asm__("2"); \ + __asm__ __volatile__ ( \ + "svc %b1\n\t" \ + : "=d" (_ret) \ + : "i" (__NR_##name) ASMFMT_##nr \ + : "memory" ); \ + _ret; }) + +#undef INTERNAL_SYSCALL_SVC0 +#define INTERNAL_SYSCALL_SVC0(name, err, nr, args...) \ + ({ \ + DECLARGS_##nr(args) \ + register unsigned long _nr __asm__("1") = (unsigned long)(__NR_##name); \ + register long _ret __asm__("2"); \ + __asm__ __volatile__ ( \ + "svc 0\n\t" \ + : "=d" (_ret) \ + : "d" (_nr) ASMFMT_##nr \ + : "memory" ); \ + _ret; }) + +#undef INTERNAL_SYSCALL_NCS +#define INTERNAL_SYSCALL_NCS(no, err, nr, args...) \ + ({ \ + DECLARGS_##nr(args) \ + register unsigned long _nr __asm__("1") = (unsigned long)(no); \ + register long _ret __asm__("2"); \ + __asm__ __volatile__ ( \ + "svc 0\n\t" \ + : "=d" (_ret) \ + : "d" (_nr) ASMFMT_##nr \ + : "memory" ); \ + _ret; }) + +#undef INTERNAL_SYSCALL +#define INTERNAL_SYSCALL(name, err, nr, args...) \ + (((__NR_##name) < 256) ? \ + INTERNAL_SYSCALL_DIRECT(name, err, nr, args) : \ + INTERNAL_SYSCALL_SVC0(name, err,nr, args)) + +#undef INTERNAL_SYSCALL_ERROR_P +#define INTERNAL_SYSCALL_ERROR_P(val, err) \ + ((unsigned long) (val) >= -4095UL) + +#undef INTERNAL_SYSCALL_ERRNO +#define INTERNAL_SYSCALL_ERRNO(val, err) (-(val)) + +#define DECLARGS_0() +#define DECLARGS_1(arg1) \ + register unsigned long gpr2 __asm__ ("2") = (unsigned long)(arg1); +#define DECLARGS_2(arg1, arg2) \ + DECLARGS_1(arg1) \ + register unsigned long gpr3 __asm__ ("3") = (unsigned long)(arg2); +#define DECLARGS_3(arg1, arg2, arg3) \ + DECLARGS_2(arg1, arg2) \ + register unsigned long gpr4 __asm__ ("4") = (unsigned long)(arg3); +#define DECLARGS_4(arg1, arg2, arg3, arg4) \ + DECLARGS_3(arg1, arg2, arg3) \ + register unsigned long gpr5 __asm__ ("5") = (unsigned long)(arg4); +#define DECLARGS_5(arg1, arg2, arg3, arg4, arg5) \ + DECLARGS_4(arg1, arg2, arg3, arg4) \ + register unsigned long gpr6 __asm__ ("6") = (unsigned long)(arg5); +#define DECLARGS_6(arg1, arg2, arg3, arg4, arg5, arg6) \ + DECLARGS_5(arg1, arg2, arg3, arg4, arg5) \ + register unsigned long gpr7 __asm__ ("7") = (unsigned long)(arg6); + +#define ASMFMT_0 +#define ASMFMT_1 , "0" (gpr2) +#define ASMFMT_2 , "0" (gpr2), "d" (gpr3) +#define ASMFMT_3 , "0" (gpr2), "d" (gpr3), "d" (gpr4) +#define ASMFMT_4 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5) +#define ASMFMT_5 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6) +#define ASMFMT_6 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6), "d" (gpr7) + +#define CLOBBER_0 , "3", "4", "5" +#define CLOBBER_1 , "3", "4", "5" +#define CLOBBER_2 , "4", "5" +#define CLOBBER_3 , "5" +#define CLOBBER_4 +#define CLOBBER_5 +#define CLOBBER_6 + +/* List of system calls which are supported as vsyscalls. */ +#define HAVE_CLOCK_GETRES_VSYSCALL 1 +#define HAVE_CLOCK_GETTIME_VSYSCALL 1 +#define HAVE_GETTIMEOFDAY_VSYSCALL 1 +#define HAVE_GETCPU_VSYSCALL 1 + +/* This version is for internal uses when there is no desire + to set errno */ +#define INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, nr, args...) \ + ({ \ + long int _ret = ENOSYS; \ + \ + __typeof (__vdso_##name) vdsop = __vdso_##name; \ + PTR_DEMANGLE (vdsop); \ + if (vdsop != NULL) \ + _ret = INTERNAL_VSYSCALL_CALL (vdsop, err, nr, ##args); \ + else \ + err = 1 << 28; \ + _ret; \ + }) + +#define INTERNAL_VSYSCALL_CALL(fn, err, nr, args...) \ + ({ \ + DECLARGS_##nr(args) \ + register long _ret __asm__("2"); \ + __asm__ __volatile__ ( \ + "lgr 10,14\n\t" \ + "basr 14,%1\n\t" \ + "lgr 14,10\n\t" \ + : "=d" (_ret) \ + : "a" (fn) ASMFMT_##nr \ + : "cc", "memory", "0", "1", "10" CLOBBER_##nr); \ + _ret; }) + +/* Pointer mangling support. */ +#if IS_IN (rtld) +/* We cannot use the thread descriptor because in ld.so we use setjmp + earlier than the descriptor is initialized. */ +#else +/* For the time being just use stack_guard rather than a separate + pointer_guard. */ +# ifdef __ASSEMBLER__ +# define PTR_MANGLE(reg, tmpreg) \ + ear tmpreg,%a0; \ + sllg tmpreg,tmpreg,32; \ + ear tmpreg,%a1; \ + xg reg,STACK_GUARD(tmpreg) +# define PTR_MANGLE2(reg, tmpreg) \ + xg reg,STACK_GUARD(tmpreg) +# define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg) +# else +# define PTR_MANGLE(var) \ + (var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ()) +# define PTR_DEMANGLE(var) PTR_MANGLE (var) +# endif +#endif + +#endif /* _LINUX_S390_SYSDEP_H */ |