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/* Copyright (C) 1992-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Brendan Kehoe (brendan@zen.org).
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/>. */
#include <sysdeps/unix/sysdep.h>
#include <dl-sysdep.h> /* Defines RTLD_PRIVATE_ERRNO. */
#ifdef __ASSEMBLER__
#ifdef __linux__
# include <alpha/regdef.h>
#else
# include <regdef.h>
#endif
#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>
/* ??? Linux needs to be able to override INLINE_SYSCALL for one
particular special case. Make this easy. */
#undef INLINE_SYSCALL
#define INLINE_SYSCALL(name, nr, args...) \
INLINE_SYSCALL1(name, nr, args)
#define INLINE_SYSCALL1(name, nr, args...) \
({ \
long _sc_ret, _sc_err; \
inline_syscall##nr(__NR_##name, args); \
if (__builtin_expect (_sc_err, 0)) \
{ \
__set_errno (_sc_ret); \
_sc_ret = -1L; \
} \
_sc_ret; \
})
#define INTERNAL_SYSCALL(name, err_out, nr, args...) \
INTERNAL_SYSCALL1(name, err_out, nr, args)
#define INTERNAL_SYSCALL1(name, err_out, nr, args...) \
INTERNAL_SYSCALL_NCS(__NR_##name, err_out, nr, args)
#define INTERNAL_SYSCALL_NCS(name, err_out, nr, args...) \
({ \
long _sc_ret, _sc_err; \
inline_syscall##nr(name, args); \
err_out = _sc_err; \
_sc_ret; \
})
#define INTERNAL_SYSCALL_DECL(err) \
long int err __attribute__((unused))
/* 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)(long)(arg) : (long)(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) ((void)val, err)
#define INTERNAL_SYSCALL_ERRNO(val, err) ((void)err, val)
#define inline_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 inline_syscall0(name, args...) \
{ \
register long _sc_19 __asm__("$19"); \
register long _sc_0 = name; \
__asm__ __volatile__ \
("callsys # %0 %1 <= %2" \
: "+v"(_sc_0), "=r"(_sc_19) \
: : inline_syscall_clobbers, \
"$16", "$17", "$18", "$20", "$21"); \
_sc_ret = _sc_0, _sc_err = _sc_19; \
}
#define inline_syscall1(name,arg1) \
{ \
register long _tmp_16 = syscall_promote (arg1); \
register long _sc_0 = name; \
register long _sc_16 __asm__("$16") = _tmp_16; \
register long _sc_19 __asm__("$19"); \
__asm__ __volatile__ \
("callsys # %0 %1 <= %2 %3" \
: "+v"(_sc_0), "=r"(_sc_19), "+r"(_sc_16) \
: : inline_syscall_clobbers, \
"$17", "$18", "$20", "$21"); \
_sc_ret = _sc_0, _sc_err = _sc_19; \
}
#define inline_syscall2(name,arg1,arg2) \
{ \
register long _tmp_16 = syscall_promote (arg1); \
register long _tmp_17 = syscall_promote (arg2); \
register long _sc_0 = name; \
register long _sc_16 __asm__("$16") = _tmp_16; \
register long _sc_17 __asm__("$17") = _tmp_17; \
register long _sc_19 __asm__("$19"); \
__asm__ __volatile__ \
("callsys # %0 %1 <= %2 %3 %4" \
: "+v"(_sc_0), "=r"(_sc_19), \
"+r"(_sc_16), "+r"(_sc_17) \
: : inline_syscall_clobbers, \
"$18", "$20", "$21"); \
_sc_ret = _sc_0, _sc_err = _sc_19; \
}
#define inline_syscall3(name,arg1,arg2,arg3) \
{ \
register long _tmp_16 = syscall_promote (arg1); \
register long _tmp_17 = syscall_promote (arg2); \
register long _tmp_18 = syscall_promote (arg3); \
register long _sc_0 = name; \
register long _sc_16 __asm__("$16") = _tmp_16; \
register long _sc_17 __asm__("$17") = _tmp_17; \
register long _sc_18 __asm__("$18") = _tmp_18; \
register long _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) \
: : inline_syscall_clobbers, "$20", "$21"); \
_sc_ret = _sc_0, _sc_err = _sc_19; \
}
#define inline_syscall4(name,arg1,arg2,arg3,arg4) \
{ \
register long _tmp_16 = syscall_promote (arg1); \
register long _tmp_17 = syscall_promote (arg2); \
register long _tmp_18 = syscall_promote (arg3); \
register long _tmp_19 = syscall_promote (arg4); \
register long _sc_0 = name; \
register long _sc_16 __asm__("$16") = _tmp_16; \
register long _sc_17 __asm__("$17") = _tmp_17; \
register long _sc_18 __asm__("$18") = _tmp_18; \
register long _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) \
: : inline_syscall_clobbers, "$20", "$21"); \
_sc_ret = _sc_0, _sc_err = _sc_19; \
}
#define inline_syscall5(name,arg1,arg2,arg3,arg4,arg5) \
{ \
register long _tmp_16 = syscall_promote (arg1); \
register long _tmp_17 = syscall_promote (arg2); \
register long _tmp_18 = syscall_promote (arg3); \
register long _tmp_19 = syscall_promote (arg4); \
register long _tmp_20 = syscall_promote (arg5); \
register long _sc_0 = name; \
register long _sc_16 __asm__("$16") = _tmp_16; \
register long _sc_17 __asm__("$17") = _tmp_17; \
register long _sc_18 __asm__("$18") = _tmp_18; \
register long _sc_19 __asm__("$19") = _tmp_19; \
register long _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) \
: : inline_syscall_clobbers, "$21"); \
_sc_ret = _sc_0, _sc_err = _sc_19; \
}
#define inline_syscall6(name,arg1,arg2,arg3,arg4,arg5,arg6) \
{ \
register long _tmp_16 = syscall_promote (arg1); \
register long _tmp_17 = syscall_promote (arg2); \
register long _tmp_18 = syscall_promote (arg3); \
register long _tmp_19 = syscall_promote (arg4); \
register long _tmp_20 = syscall_promote (arg5); \
register long _tmp_21 = syscall_promote (arg6); \
register long _sc_0 = name; \
register long _sc_16 __asm__("$16") = _tmp_16; \
register long _sc_17 __asm__("$17") = _tmp_17; \
register long _sc_18 __asm__("$18") = _tmp_18; \
register long _sc_19 __asm__("$19") = _tmp_19; \
register long _sc_20 __asm__("$20") = _tmp_20; \
register long _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) \
: : inline_syscall_clobbers); \
_sc_ret = _sc_0, _sc_err = _sc_19; \
}
#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 */
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