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Diffstat (limited to 'sysdeps/unix/sysv/linux/ia64/sysdep.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/ia64/sysdep.h | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/ia64/sysdep.h b/sysdeps/unix/sysv/linux/ia64/sysdep.h new file mode 100644 index 0000000000..4b732632d6 --- /dev/null +++ b/sysdeps/unix/sysv/linux/ia64/sysdep.h @@ -0,0 +1,386 @@ +/* Copyright (C) 1999-2014 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Written by Jes Sorensen, <Jes.Sorensen@cern.ch>, April 1999. + Based on code originally written by David Mosberger-Tang + + 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_IA64_SYSDEP_H +#define _LINUX_IA64_SYSDEP_H 1 + +#include <sysdeps/unix/sysdep.h> +#include <sysdeps/ia64/sysdep.h> +#include <dl-sysdep.h> +#include <tls.h> + +/* In order to get __set_errno() definition in INLINE_SYSCALL. */ +#ifndef __ASSEMBLER__ +#include <errno.h> +#endif + +/* As of GAS v2.4.90.0.7, including a ".align" directive inside a + function will cause bad unwind info to be emitted (GAS doesn't know + how to account for the padding introduced by the .align directive). + Turning on this macro will work around this bug by introducing the + necessary padding explicitly. */ +#define GAS_ALIGN_BREAKS_UNWIND_INFO + +/* 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 + +/* This is a kludge to make syscalls.list find these under the names + pread and pwrite, since some kernel headers define those names + and some define the *64 names for the same system calls. */ +#if !defined __NR_pread && defined __NR_pread64 +# define __NR_pread __NR_pread64 +#endif +#if !defined __NR_pwrite && defined __NR_pwrite64 +# define __NR_pwrite __NR_pwrite64 +#endif + +/* This is to help the old kernel headers where __NR_semtimedop is not + available. */ +#ifndef __NR_semtimedop +# define __NR_semtimedop 1247 +#endif + +#if defined USE_DL_SYSINFO \ + && (!defined NOT_IN_libc \ + || defined IS_IN_libpthread || defined IS_IN_librt) +# define IA64_USE_NEW_STUB +#else +# undef IA64_USE_NEW_STUB +#endif + +#ifdef __ASSEMBLER__ + +#undef CALL_MCOUNT +#ifdef PROF +# define CALL_MCOUNT \ + .data; \ +1: data8 0; /* XXX fixme: use .xdata8 once labels work */ \ + .previous; \ + .prologue; \ + .save ar.pfs, r40; \ + alloc out0 = ar.pfs, 8, 0, 4, 0; \ + mov out1 = gp; \ + .save rp, out2; \ + mov out2 = rp; \ + .body; \ + ;; \ + addl out3 = @ltoff(1b), gp; \ + br.call.sptk.many rp = _mcount \ + ;; +#else +# define CALL_MCOUNT /* Do nothing. */ +#endif + +/* 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 %d0 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. */ + +/* We don't want the label for the error handler to be visible in the symbol + table when we define it here. */ +#define SYSCALL_ERROR_LABEL __syscall_error + +#undef PSEUDO +#define PSEUDO(name, syscall_name, args) \ + ENTRY(name) \ + DO_CALL (SYS_ify(syscall_name)); \ + cmp.eq p6,p0=-1,r10; \ +(p6) br.cond.spnt.few __syscall_error; + +#define DO_CALL_VIA_BREAK(num) \ + mov r15=num; \ + break __BREAK_SYSCALL + +#ifdef IA64_USE_NEW_STUB +# ifdef SHARED +# define DO_CALL(num) \ + .prologue; \ + adds r2 = SYSINFO_OFFSET, r13;; \ + ld8 r2 = [r2]; \ + .save ar.pfs, r11; \ + mov r11 = ar.pfs;; \ + .body; \ + mov r15 = num; \ + mov b7 = r2; \ + br.call.sptk.many b6 = b7;; \ + .restore sp; \ + mov ar.pfs = r11; \ + .prologue; \ + .body +# else /* !SHARED */ +# define DO_CALL(num) \ + .prologue; \ + mov r15 = num; \ + movl r2 = _dl_sysinfo;; \ + ld8 r2 = [r2]; \ + .save ar.pfs, r11; \ + mov r11 = ar.pfs;; \ + .body; \ + mov b7 = r2; \ + br.call.sptk.many b6 = b7;; \ + .restore sp; \ + mov ar.pfs = r11; \ + .prologue; \ + .body +# endif +#else +# define DO_CALL(num) DO_CALL_VIA_BREAK(num) +#endif + +#undef PSEUDO_END +#define PSEUDO_END(name) .endp C_SYMBOL_NAME(name); + +#undef PSEUDO_NOERRNO +#define PSEUDO_NOERRNO(name, syscall_name, args) \ + ENTRY(name) \ + DO_CALL (SYS_ify(syscall_name)); + +#undef PSEUDO_END_NOERRNO +#define PSEUDO_END_NOERRNO(name) .endp C_SYMBOL_NAME(name); + +#undef PSEUDO_ERRVAL +#define PSEUDO_ERRVAL(name, syscall_name, args) \ + ENTRY(name) \ + DO_CALL (SYS_ify(syscall_name)); \ + cmp.eq p6,p0=-1,r10; \ +(p6) mov r10=r8; + + +#undef PSEUDO_END_ERRVAL +#define PSEUDO_END_ERRVAL(name) .endp C_SYMBOL_NAME(name); + +#undef END +#define END(name) \ + .size C_SYMBOL_NAME(name), . - C_SYMBOL_NAME(name) ; \ + .endp C_SYMBOL_NAME(name) + +#define ret br.ret.sptk.few b0 +#define ret_NOERRNO ret +#define ret_ERRVAL ret + +#else /* not __ASSEMBLER__ */ + +#define BREAK_INSN_1(num) "break " #num ";;\n\t" +#define BREAK_INSN(num) BREAK_INSN_1(num) + +/* On IA-64 we have stacked registers for passing arguments. The + "out" registers end up being the called function's "in" + registers. + + Also, since we have plenty of registers we have two return values + from a syscall. r10 is set to -1 on error, whilst r8 contains the + (non-negative) errno on error or the return value on success. + */ + +#ifdef IA64_USE_NEW_STUB + +# define DO_INLINE_SYSCALL_NCS(name, nr, args...) \ + LOAD_ARGS_##nr (args) \ + register long _r8 __asm ("r8"); \ + register long _r10 __asm ("r10"); \ + register long _r15 __asm ("r15") = name; \ + register void *_b7 __asm ("b7") = ((tcbhead_t *)__thread_self)->__private;\ + long _retval; \ + LOAD_REGS_##nr \ + /* \ + * Don't specify any unwind info here. We mark ar.pfs as \ + * clobbered. This will force the compiler to save ar.pfs \ + * somewhere and emit appropriate unwind info for that save. \ + */ \ + __asm __volatile ("br.call.sptk.many b6=%0;;\n" \ + : "=b"(_b7), "=r" (_r8), "=r" (_r10), "=r" (_r15) \ + ASM_OUTARGS_##nr \ + : "0" (_b7), "3" (_r15) ASM_ARGS_##nr \ + : "memory", "ar.pfs" ASM_CLOBBERS_##nr); \ + _retval = _r8; + +#else /* !IA64_USE_NEW_STUB */ + +# define DO_INLINE_SYSCALL_NCS(name, nr, args...) \ + LOAD_ARGS_##nr (args) \ + register long _r8 asm ("r8"); \ + register long _r10 asm ("r10"); \ + register long _r15 asm ("r15") = name; \ + long _retval; \ + LOAD_REGS_##nr \ + __asm __volatile (BREAK_INSN (__BREAK_SYSCALL) \ + : "=r" (_r8), "=r" (_r10), "=r" (_r15) \ + ASM_OUTARGS_##nr \ + : "2" (_r15) ASM_ARGS_##nr \ + : "memory" ASM_CLOBBERS_##nr); \ + _retval = _r8; + +#endif /* !IA64_USE_NEW_STUB */ + +#define DO_INLINE_SYSCALL(name, nr, args...) \ + DO_INLINE_SYSCALL_NCS (__NR_##name, nr, ##args) + +#undef INLINE_SYSCALL +#define INLINE_SYSCALL(name, nr, args...) \ + ({ \ + DO_INLINE_SYSCALL_NCS (__NR_##name, nr, args) \ + if (_r10 == -1) \ + { \ + __set_errno (_retval); \ + _retval = -1; \ + } \ + _retval; }) + +#undef INTERNAL_SYSCALL_DECL +#define INTERNAL_SYSCALL_DECL(err) long int err __attribute__ ((unused)) + +#undef INTERNAL_SYSCALL +#define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ + ({ \ + DO_INLINE_SYSCALL_NCS (name, nr, args) \ + err = _r10; \ + _retval; }) +#define INTERNAL_SYSCALL(name, err, nr, args...) \ + INTERNAL_SYSCALL_NCS (__NR_##name, err, nr, ##args) + +#undef INTERNAL_SYSCALL_ERROR_P +#define INTERNAL_SYSCALL_ERROR_P(val, err) \ + ({ (void) (val); \ + (err == -1); \ + }) + +#undef INTERNAL_SYSCALL_ERRNO +#define INTERNAL_SYSCALL_ERRNO(val, err) (val) + +#define LOAD_ARGS_0() +#define LOAD_REGS_0 +#define LOAD_ARGS_1(a1) \ + long _arg1 = (long) (a1); \ + LOAD_ARGS_0 () +#define LOAD_REGS_1 \ + register long _out0 asm ("out0") = _arg1; \ + LOAD_REGS_0 +#define LOAD_ARGS_2(a1, a2) \ + long _arg2 = (long) (a2); \ + LOAD_ARGS_1 (a1) +#define LOAD_REGS_2 \ + register long _out1 asm ("out1") = _arg2; \ + LOAD_REGS_1 +#define LOAD_ARGS_3(a1, a2, a3) \ + long _arg3 = (long) (a3); \ + LOAD_ARGS_2 (a1, a2) +#define LOAD_REGS_3 \ + register long _out2 asm ("out2") = _arg3; \ + LOAD_REGS_2 +#define LOAD_ARGS_4(a1, a2, a3, a4) \ + long _arg4 = (long) (a4); \ + LOAD_ARGS_3 (a1, a2, a3) +#define LOAD_REGS_4 \ + register long _out3 asm ("out3") = _arg4; \ + LOAD_REGS_3 +#define LOAD_ARGS_5(a1, a2, a3, a4, a5) \ + long _arg5 = (long) (a5); \ + LOAD_ARGS_4 (a1, a2, a3, a4) +#define LOAD_REGS_5 \ + register long _out4 asm ("out4") = _arg5; \ + LOAD_REGS_4 +#define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6) \ + long _arg6 = (long) (a6); \ + LOAD_ARGS_5 (a1, a2, a3, a4, a5) +#define LOAD_REGS_6 \ + register long _out5 asm ("out5") = _arg6; \ + LOAD_REGS_5 + +#define ASM_OUTARGS_0 +#define ASM_OUTARGS_1 ASM_OUTARGS_0, "=r" (_out0) +#define ASM_OUTARGS_2 ASM_OUTARGS_1, "=r" (_out1) +#define ASM_OUTARGS_3 ASM_OUTARGS_2, "=r" (_out2) +#define ASM_OUTARGS_4 ASM_OUTARGS_3, "=r" (_out3) +#define ASM_OUTARGS_5 ASM_OUTARGS_4, "=r" (_out4) +#define ASM_OUTARGS_6 ASM_OUTARGS_5, "=r" (_out5) + +#ifdef IA64_USE_NEW_STUB +#define ASM_ARGS_0 +#define ASM_ARGS_1 ASM_ARGS_0, "4" (_out0) +#define ASM_ARGS_2 ASM_ARGS_1, "5" (_out1) +#define ASM_ARGS_3 ASM_ARGS_2, "6" (_out2) +#define ASM_ARGS_4 ASM_ARGS_3, "7" (_out3) +#define ASM_ARGS_5 ASM_ARGS_4, "8" (_out4) +#define ASM_ARGS_6 ASM_ARGS_5, "9" (_out5) +#else +#define ASM_ARGS_0 +#define ASM_ARGS_1 ASM_ARGS_0, "3" (_out0) +#define ASM_ARGS_2 ASM_ARGS_1, "4" (_out1) +#define ASM_ARGS_3 ASM_ARGS_2, "5" (_out2) +#define ASM_ARGS_4 ASM_ARGS_3, "6" (_out3) +#define ASM_ARGS_5 ASM_ARGS_4, "7" (_out4) +#define ASM_ARGS_6 ASM_ARGS_5, "8" (_out5) +#endif + +#define ASM_CLOBBERS_0 ASM_CLOBBERS_1, "out0" +#define ASM_CLOBBERS_1 ASM_CLOBBERS_2, "out1" +#define ASM_CLOBBERS_2 ASM_CLOBBERS_3, "out2" +#define ASM_CLOBBERS_3 ASM_CLOBBERS_4, "out3" +#define ASM_CLOBBERS_4 ASM_CLOBBERS_5, "out4" +#define ASM_CLOBBERS_5 ASM_CLOBBERS_6, "out5" +#define ASM_CLOBBERS_6_COMMON , "out6", "out7", \ + /* Non-stacked integer registers, minus r8, r10, r15. */ \ + "r2", "r3", "r9", "r11", "r12", "r13", "r14", "r16", "r17", "r18", \ + "r19", "r20", "r21", "r22", "r23", "r24", "r25", "r26", "r27", \ + "r28", "r29", "r30", "r31", \ + /* Predicate registers. */ \ + "p6", "p7", "p8", "p9", "p10", "p11", "p12", "p13", "p14", "p15", \ + /* Non-rotating fp registers. */ \ + "f6", "f7", "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \ + /* Branch registers. */ \ + "b6" + +#ifdef IA64_USE_NEW_STUB +# define ASM_CLOBBERS_6 ASM_CLOBBERS_6_COMMON +#else +# define ASM_CLOBBERS_6 ASM_CLOBBERS_6_COMMON , "b7" +#endif + +#endif /* not __ASSEMBLER__ */ + +/* Pointer mangling support. */ +#if defined NOT_IN_libc && defined IS_IN_rtld +/* We cannot use the thread descriptor because in ld.so we use setjmp + earlier than the descriptor is initialized. */ +#else +# ifdef __ASSEMBLER__ +# define PTR_MANGLE(reg, tmpreg) \ + add tmpreg=-16,r13 \ + ;; \ + ld8 tmpreg=[tmpreg] \ + ;; \ + xor reg=reg, 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/ia64/sysdep.h */ |