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/* Copyright (C) 1999-2023 Free Software Foundation, Inc.
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
<https://www.gnu.org/licenses/>. */
#ifndef _LINUX_IA64_SYSDEP_H
#define _LINUX_IA64_SYSDEP_H 1
#include <sysdeps/unix/sysdep.h>
#include <sysdeps/unix/sysv/linux/sysdep.h>
#include <sysdeps/ia64/sysdep.h>
#include <dl-sysdep.h>
#include <tls.h>
#include <asm/break.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
#ifndef IA64_USE_NEW_STUB
# if defined USE_DL_SYSINFO && IS_IN (libc)
# define IA64_USE_NEW_STUB 1
# else
# define IA64_USE_NEW_STUB 0
# endif
#endif
#if IA64_USE_NEW_STUB && !USE_DL_SYSINFO
# error IA64_USE_NEW_STUB needs USE_DL_SYSINFO
#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. */
#undef SYSCALL_ERROR_LABEL
#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 __IA64_BREAK_SYSCALL
#if 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__ */
#undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
#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.
*/
#if IA64_USE_NEW_STUB
# define INTERNAL_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;\
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); \
_r10 == -1 ? -_r8 : _r8; \
})
#else /* !IA64_USE_NEW_STUB */
# define INTERNAL_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; \
LOAD_REGS_##nr \
__asm __volatile (BREAK_INSN (__IA64_BREAK_SYSCALL) \
: "=r" (_r8), "=r" (_r10), "=r" (_r15) \
ASM_OUTARGS_##nr \
: "2" (_r15) ASM_ARGS_##nr \
: "memory" ASM_CLOBBERS_##nr); \
_r10 == -1 ? -_r8 : _r8; \
})
#endif /* !IA64_USE_NEW_STUB */
#define INTERNAL_SYSCALL(name, nr, args...) \
INTERNAL_SYSCALL_NCS (__NR_##name, nr, ##args)
#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)
#if 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", "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"
#if 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__ */
#endif /* linux/ia64/sysdep.h */
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