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383 lines
12 KiB
C
383 lines
12 KiB
C
/* Copyright (C) 1992-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Brendan Kehoe (brendan@zen.org).
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdeps/unix/sysdep.h>
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#include <dl-sysdep.h> /* Defines RTLD_PRIVATE_ERRNO. */
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#ifdef __ASSEMBLER__
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#ifdef __linux__
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# include <alpha/regdef.h>
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#else
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# include <regdef.h>
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#endif
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#define __LABEL(x) x##:
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#define LEAF(name, framesize) \
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.globl name; \
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.align 4; \
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.ent name, 0; \
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__LABEL(name) \
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.frame sp, framesize, ra
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#define ENTRY(name) \
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.globl name; \
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.align 4; \
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.ent name, 0; \
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__LABEL(name) \
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.frame sp, 0, ra
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/* Mark the end of function SYM. */
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#undef END
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#define END(sym) .end sym
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#ifdef PROF
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# define PSEUDO_PROF \
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.set noat; \
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lda AT, _mcount; \
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jsr AT, (AT), _mcount; \
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.set at
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#else
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# define PSEUDO_PROF
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#endif
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#ifdef PROF
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# define PSEUDO_PROLOGUE \
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.frame sp, 0, ra; \
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ldgp gp,0(pv); \
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PSEUDO_PROF; \
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.prologue 1
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#elif defined PIC
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# define PSEUDO_PROLOGUE \
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.frame sp, 0, ra; \
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.prologue 0
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#else
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# define PSEUDO_PROLOGUE \
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.frame sp, 0, ra; \
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ldgp gp,0(pv); \
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.prologue 1
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#endif /* PROF */
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#ifdef PROF
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# define USEPV_PROF std
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#else
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# define USEPV_PROF no
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#endif
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#if RTLD_PRIVATE_ERRNO
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# define SYSCALL_ERROR_LABEL $syscall_error
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# define SYSCALL_ERROR_HANDLER \
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$syscall_error: \
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stl v0, rtld_errno(gp) !gprel; \
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lda v0, -1; \
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ret
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# define SYSCALL_ERROR_FALLTHRU
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#elif defined(PIC)
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# define SYSCALL_ERROR_LABEL __syscall_error !samegp
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# define SYSCALL_ERROR_HANDLER
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# define SYSCALL_ERROR_FALLTHRU br SYSCALL_ERROR_LABEL
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#else
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# define SYSCALL_ERROR_LABEL $syscall_error
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# define SYSCALL_ERROR_HANDLER \
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$syscall_error: \
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jmp $31, __syscall_error
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# define SYSCALL_ERROR_FALLTHRU
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#endif /* RTLD_PRIVATE_ERRNO */
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/* Overridden by specific syscalls. */
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#undef PSEUDO_PREPARE_ARGS
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#define PSEUDO_PREPARE_ARGS /* Nothing. */
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#define PSEUDO(name, syscall_name, args) \
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.globl name; \
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.align 4; \
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.ent name,0; \
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__LABEL(name) \
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PSEUDO_PROLOGUE; \
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PSEUDO_PREPARE_ARGS \
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lda v0, SYS_ify(syscall_name); \
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call_pal PAL_callsys; \
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bne a3, SYSCALL_ERROR_LABEL
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#undef PSEUDO_END
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#define PSEUDO_END(sym) \
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SYSCALL_ERROR_HANDLER; \
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END(sym)
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#define PSEUDO_NOERRNO(name, syscall_name, args) \
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.globl name; \
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.align 4; \
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.ent name,0; \
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__LABEL(name) \
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PSEUDO_PROLOGUE; \
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PSEUDO_PREPARE_ARGS \
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lda v0, SYS_ify(syscall_name); \
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call_pal PAL_callsys;
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#undef PSEUDO_END_NOERRNO
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#define PSEUDO_END_NOERRNO(sym) END(sym)
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#define ret_NOERRNO ret
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#define PSEUDO_ERRVAL(name, syscall_name, args) \
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.globl name; \
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.align 4; \
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.ent name,0; \
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__LABEL(name) \
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PSEUDO_PROLOGUE; \
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PSEUDO_PREPARE_ARGS \
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lda v0, SYS_ify(syscall_name); \
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call_pal PAL_callsys;
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#undef PSEUDO_END_ERRVAL
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#define PSEUDO_END_ERRVAL(sym) END(sym)
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#define ret_ERRVAL ret
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#define r0 v0
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#define r1 a4
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#define MOVE(x,y) mov x,y
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#else /* !ASSEMBLER */
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/* In order to get __set_errno() definition in INLINE_SYSCALL. */
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#include <errno.h>
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/* ??? Linux needs to be able to override INLINE_SYSCALL for one
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particular special case. Make this easy. */
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#undef INLINE_SYSCALL
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#define INLINE_SYSCALL(name, nr, args...) \
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INLINE_SYSCALL1(name, nr, args)
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#define INLINE_SYSCALL1(name, nr, args...) \
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({ \
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long _sc_ret, _sc_err; \
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inline_syscall##nr(__NR_##name, args); \
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if (__builtin_expect (_sc_err, 0)) \
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{ \
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__set_errno (_sc_ret); \
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_sc_ret = -1L; \
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} \
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_sc_ret; \
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})
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#define INTERNAL_SYSCALL(name, err_out, nr, args...) \
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INTERNAL_SYSCALL1(name, err_out, nr, args)
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#define INTERNAL_SYSCALL1(name, err_out, nr, args...) \
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INTERNAL_SYSCALL_NCS(__NR_##name, err_out, nr, args)
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#define INTERNAL_SYSCALL_NCS(name, err_out, nr, args...) \
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({ \
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long _sc_ret, _sc_err; \
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inline_syscall##nr(name, args); \
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err_out = _sc_err; \
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_sc_ret; \
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})
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#define INTERNAL_SYSCALL_DECL(err) \
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long int err __attribute__((unused))
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/* The normal Alpha calling convention sign-extends 32-bit quantties
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no matter what the "real" sign of the 32-bit type. We want to
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preserve that when filling in values for the kernel. */
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#define syscall_promote(arg) \
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(sizeof(arg) == 4 ? (long)(int)(long)(arg) : (long)(arg))
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/* Make sure and "use" the variable that we're not returning,
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in order to suppress unused variable warnings. */
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#define INTERNAL_SYSCALL_ERROR_P(val, err) ((void)val, err)
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#define INTERNAL_SYSCALL_ERRNO(val, err) ((void)err, val)
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#define inline_syscall_clobbers \
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"$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", \
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"$22", "$23", "$24", "$25", "$27", "$28", "memory"
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/* It is moderately important optimization-wise to limit the lifetime
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of the hard-register variables as much as possible. Thus we copy
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in/out as close to the asm as possible. */
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#define inline_syscall0(name, args...) \
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{ \
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register long _sc_19 __asm__("$19"); \
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register long _sc_0 = name; \
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__asm__ __volatile__ \
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("callsys # %0 %1 <= %2" \
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: "+v"(_sc_0), "=r"(_sc_19) \
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: : inline_syscall_clobbers, \
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"$16", "$17", "$18", "$20", "$21"); \
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_sc_ret = _sc_0, _sc_err = _sc_19; \
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}
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#define inline_syscall1(name,arg1) \
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{ \
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register long _tmp_16 = syscall_promote (arg1); \
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register long _sc_0 = name; \
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register long _sc_16 __asm__("$16") = _tmp_16; \
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register long _sc_19 __asm__("$19"); \
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__asm__ __volatile__ \
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("callsys # %0 %1 <= %2 %3" \
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: "+v"(_sc_0), "=r"(_sc_19), "+r"(_sc_16) \
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: : inline_syscall_clobbers, \
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"$17", "$18", "$20", "$21"); \
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_sc_ret = _sc_0, _sc_err = _sc_19; \
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}
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#define inline_syscall2(name,arg1,arg2) \
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{ \
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register long _tmp_16 = syscall_promote (arg1); \
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register long _tmp_17 = syscall_promote (arg2); \
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register long _sc_0 = name; \
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register long _sc_16 __asm__("$16") = _tmp_16; \
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register long _sc_17 __asm__("$17") = _tmp_17; \
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register long _sc_19 __asm__("$19"); \
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__asm__ __volatile__ \
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("callsys # %0 %1 <= %2 %3 %4" \
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: "+v"(_sc_0), "=r"(_sc_19), \
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"+r"(_sc_16), "+r"(_sc_17) \
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: : inline_syscall_clobbers, \
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"$18", "$20", "$21"); \
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_sc_ret = _sc_0, _sc_err = _sc_19; \
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}
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#define inline_syscall3(name,arg1,arg2,arg3) \
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{ \
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register long _tmp_16 = syscall_promote (arg1); \
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register long _tmp_17 = syscall_promote (arg2); \
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register long _tmp_18 = syscall_promote (arg3); \
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register long _sc_0 = name; \
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register long _sc_16 __asm__("$16") = _tmp_16; \
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register long _sc_17 __asm__("$17") = _tmp_17; \
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register long _sc_18 __asm__("$18") = _tmp_18; \
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register long _sc_19 __asm__("$19"); \
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__asm__ __volatile__ \
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("callsys # %0 %1 <= %2 %3 %4 %5" \
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: "+v"(_sc_0), "=r"(_sc_19), "+r"(_sc_16), \
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"+r"(_sc_17), "+r"(_sc_18) \
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: : inline_syscall_clobbers, "$20", "$21"); \
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_sc_ret = _sc_0, _sc_err = _sc_19; \
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}
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#define inline_syscall4(name,arg1,arg2,arg3,arg4) \
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{ \
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register long _tmp_16 = syscall_promote (arg1); \
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register long _tmp_17 = syscall_promote (arg2); \
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register long _tmp_18 = syscall_promote (arg3); \
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register long _tmp_19 = syscall_promote (arg4); \
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register long _sc_0 = name; \
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register long _sc_16 __asm__("$16") = _tmp_16; \
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register long _sc_17 __asm__("$17") = _tmp_17; \
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register long _sc_18 __asm__("$18") = _tmp_18; \
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register long _sc_19 __asm__("$19") = _tmp_19; \
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__asm__ __volatile__ \
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("callsys # %0 %1 <= %2 %3 %4 %5 %6" \
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: "+v"(_sc_0), "+r"(_sc_19), "+r"(_sc_16), \
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"+r"(_sc_17), "+r"(_sc_18) \
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: : inline_syscall_clobbers, "$20", "$21"); \
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_sc_ret = _sc_0, _sc_err = _sc_19; \
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}
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#define inline_syscall5(name,arg1,arg2,arg3,arg4,arg5) \
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{ \
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register long _tmp_16 = syscall_promote (arg1); \
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register long _tmp_17 = syscall_promote (arg2); \
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register long _tmp_18 = syscall_promote (arg3); \
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register long _tmp_19 = syscall_promote (arg4); \
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register long _tmp_20 = syscall_promote (arg5); \
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register long _sc_0 = name; \
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register long _sc_16 __asm__("$16") = _tmp_16; \
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register long _sc_17 __asm__("$17") = _tmp_17; \
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register long _sc_18 __asm__("$18") = _tmp_18; \
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register long _sc_19 __asm__("$19") = _tmp_19; \
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register long _sc_20 __asm__("$20") = _tmp_20; \
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__asm__ __volatile__ \
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("callsys # %0 %1 <= %2 %3 %4 %5 %6 %7" \
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: "+v"(_sc_0), "+r"(_sc_19), "+r"(_sc_16), \
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"+r"(_sc_17), "+r"(_sc_18), "+r"(_sc_20) \
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: : inline_syscall_clobbers, "$21"); \
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_sc_ret = _sc_0, _sc_err = _sc_19; \
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}
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#define inline_syscall6(name,arg1,arg2,arg3,arg4,arg5,arg6) \
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{ \
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register long _tmp_16 = syscall_promote (arg1); \
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register long _tmp_17 = syscall_promote (arg2); \
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register long _tmp_18 = syscall_promote (arg3); \
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register long _tmp_19 = syscall_promote (arg4); \
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register long _tmp_20 = syscall_promote (arg5); \
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register long _tmp_21 = syscall_promote (arg6); \
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register long _sc_0 = name; \
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register long _sc_16 __asm__("$16") = _tmp_16; \
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register long _sc_17 __asm__("$17") = _tmp_17; \
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register long _sc_18 __asm__("$18") = _tmp_18; \
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register long _sc_19 __asm__("$19") = _tmp_19; \
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register long _sc_20 __asm__("$20") = _tmp_20; \
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register long _sc_21 __asm__("$21") = _tmp_21; \
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__asm__ __volatile__ \
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("callsys # %0 %1 <= %2 %3 %4 %5 %6 %7 %8" \
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: "+v"(_sc_0), "+r"(_sc_19), "+r"(_sc_16), \
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"+r"(_sc_17), "+r"(_sc_18), "+r"(_sc_20), \
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"+r"(_sc_21) \
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: : inline_syscall_clobbers); \
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_sc_ret = _sc_0, _sc_err = _sc_19; \
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}
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#endif /* ASSEMBLER */
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/* Pointer mangling support. Note that tls access is slow enough that
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we don't deoptimize things by placing the pointer check value there. */
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#ifdef __ASSEMBLER__
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# if IS_IN (rtld)
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# define PTR_MANGLE(dst, src, tmp) \
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ldah tmp, __pointer_chk_guard_local($29) !gprelhigh; \
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ldq tmp, __pointer_chk_guard_local(tmp) !gprellow; \
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xor src, tmp, dst
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# define PTR_MANGLE2(dst, src, tmp) \
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xor src, tmp, dst
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# elif defined SHARED
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# define PTR_MANGLE(dst, src, tmp) \
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ldq tmp, __pointer_chk_guard; \
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xor src, tmp, dst
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# else
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# define PTR_MANGLE(dst, src, tmp) \
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ldq tmp, __pointer_chk_guard_local; \
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xor src, tmp, dst
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# endif
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# define PTR_MANGLE2(dst, src, tmp) \
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xor src, tmp, dst
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# define PTR_DEMANGLE(dst, tmp) PTR_MANGLE(dst, dst, tmp)
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# define PTR_DEMANGLE2(dst, tmp) PTR_MANGLE2(dst, dst, tmp)
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#else
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# include <stdint.h>
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# if (IS_IN (rtld) \
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|| (!defined SHARED && (IS_IN (libc) \
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|| IS_IN (libpthread))))
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extern uintptr_t __pointer_chk_guard_local attribute_relro attribute_hidden;
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# define PTR_MANGLE(var) \
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(var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard_local)
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# else
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extern uintptr_t __pointer_chk_guard attribute_relro;
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# define PTR_MANGLE(var) \
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(var) = (__typeof(var)) ((uintptr_t) (var) ^ __pointer_chk_guard)
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# endif
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# define PTR_DEMANGLE(var) PTR_MANGLE(var)
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#endif /* ASSEMBLER */
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