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linux: Consolidate brk implementation

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It removes all the arch-specific assembly implementation.  The
outliers are alpha, where its kernel ABI explict return -ENOMEM
in case of failure; and i686, where it can't use
"call *%gs:SYSINFO_OFFSET" during statup in static PIE.

Also some ABIs exports an additional ___brk_addr symbol and to
handle it an internal HAVE_INTERNAL_BRK_ADDR_SYMBOL is added.

Checked on x86_64-linux-gnu, i686-linux-gnu, adn with builsd for
the affected ABIs.

Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
This commit is contained in:
Adhemerval Zanella 2020-06-26 16:06:49 -03:00
parent 880433de13
commit 720480934a
36 changed files with 60 additions and 745 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
sysdeps/unix/sysv/linux/aarch64/sysdep.h
View File

@ -234,6 +234,9 @@
# define INTERNAL_SYSCALL_NCS(number, nr, args...) \
INTERNAL_SYSCALL_RAW (number, nr, args)
#undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
#endif /* __ASSEMBLER__ */
/* Pointer mangling is supported for AArch64. */

83
sysdeps/unix/sysv/linux/alpha/brk.S
View File

@ -1,83 +0,0 @@
/* Copyright (C) 1993-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Brendan Kehoe <brendan@zen.org>, 1993.
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/>. */
/* __brk is a special syscall under Linux since it never returns an
error. Instead, the error condition is indicated by returning the old
break value (instead of the new, requested one). */
#include <sysdep.h>
#include <errno.h>
#ifdef PIC
.section .bss
.align 3
.globl __curbrk
__curbrk: .skip 8
.type __curbrk,@object
.size __curbrk,8
#else
.comm __curbrk, 8
#endif
.text
.align 4
.globl __brk
.ent __brk
.usepv __brk, std
cfi_startproc
__brk:
ldgp gp, 0(t12)
subq sp, 16, sp
cfi_adjust_cfa_offset (16)
#ifdef PROF
.set noat
lda AT, _mcount
jsr AT, (AT), _mcount
.set at
#endif
/* Save the requested brk across the system call. */
stq a0, 0(sp)
ldiq v0, __NR_brk
call_pal PAL_callsys
ldq a0, 0(sp)
addq sp, 16, sp
cfi_adjust_cfa_offset (-16)
/* Be prepared for an OSF-style brk. */
bne a3, SYSCALL_ERROR_LABEL
beq v0, $ok
/* Correctly handle the brk(0) query case. */
cmoveq a0, v0, a0
xor a0, v0, t0
lda v0, ENOMEM
bne t0, SYSCALL_ERROR_LABEL
/* Update __curbrk and return cleanly. */
lda v0, 0
$ok: stq a0, __curbrk
ret
PSEUDO_END(__brk)
cfi_endproc
weak_alias (__brk, brk)

13
sysdeps/unix/sysv/linux/arm/brk.c → sysdeps/unix/sysv/linux/alpha/brk.c
View File

@ -1,5 +1,5 @@
/* brk system call for Linux/ARM.
Copyright (C) 1995-2020 Free Software Foundation, Inc.
/* Change data segment size. Linux/Alpha.
Copyright (C) 2020 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
@ -20,17 +20,14 @@
#include <unistd.h>
#include <sysdep.h>
/* This must be initialized data because commons can't have aliases. */
void *__curbrk = 0;
int
__brk (void *addr)
{
void *newbrk;
__curbrk = newbrk = (void *) INLINE_SYSCALL (brk, 1, addr);
if (newbrk < addr)
/* Alpha brk returns -ENOMEM in case of failure. */
__curbrk = (void *) INTERNAL_SYSCALL_CALL (brk, addr);
if ((unsigned long) __curbrk == -ENOMEM)
{
__set_errno (ENOMEM);
return -1;

1
sysdeps/unix/sysv/linux/alpha/dl-brk.S
View File

@ -1 +0,0 @@
#include <brk.S>

3
sysdeps/unix/sysv/linux/arc/sysdep.h
View File

@ -221,6 +221,9 @@ hidden_proto (__syscall_error)
# define PTR_MANGLE(var) (void) (var)
# define PTR_DEMANGLE(var) (void) (var)
# undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
# define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
#endif /* !__ASSEMBLER__ */
#endif /* linux/arc/sysdep.h */

6
sysdeps/unix/sysv/linux/generic/brk.c → sysdeps/unix/sysv/linux/brk.c
View File

@ -1,6 +1,6 @@
/* Copyright (C) 2011-2020 Free Software Foundation, Inc.
/* Change data segment. Linux generic version.
Copyright (C) 2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
@ -23,10 +23,12 @@
/* This must be initialized data because commons can't have aliases. */
void *__curbrk = 0;
#if HAVE_INTERNAL_BRK_ADDR_SYMBOL
/* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt
to work around different old braindamage in the old Linux ELF dynamic
linker. */
weak_alias (__curbrk, ___brk_addr)
#endif
int
__brk (void *addr)

3
sysdeps/unix/sysv/linux/csky/sysdep.h
View File

@ -461,6 +461,9 @@ __local_syscall_error: \
# define INTERNAL_SYSCALL_NCS(number, nr, args...) \
INTERNAL_SYSCALL_RAW##nr (number, args)
#undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
#endif /* __ASSEMBLER__ */
/* Pointer mangling support. */

5
sysdeps/unix/sysv/linux/dl-brk.c
View File

@ -1,5 +0,0 @@
/* We can use the normal code but we also know the __curbrk is not exported
from ld.so. */
extern void *__curbrk attribute_hidden;
#include <brk.c>

41
sysdeps/unix/sysv/linux/hppa/brk.c
View File

@ -1,41 +0,0 @@
/* brk system call for Linux/HPPA.
Copyright (C) 1995-2020 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/>. */
#include <errno.h>
#include <unistd.h>
#include <sysdep.h>
/* This must be initialized data because commons can't have aliases. */
void *__curbrk = 0;
int
__brk (void *addr)
{
void *newbrk;
__curbrk = newbrk = (void *) INLINE_SYSCALL (brk, 1, addr);
if (newbrk < addr)
{
__set_errno (ENOMEM);
return -1;
}
return 0;
}
weak_alias (__brk, brk)

23
sysdeps/unix/sysv/linux/i386/brk.c
View File

@ -21,25 +21,4 @@
# define I386_USE_SYSENTER 0
#endif
#include <errno.h>
#include <unistd.h>
#include <sysdep.h>
/* This must be initialized data because commons can't have aliases. */
void *__curbrk = 0;
/* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt
to work around different old braindamage in the old Linux ELF dynamic
linker. */
weak_alias (__curbrk, ___brk_addr)
int
__brk (void *addr)
{
void *newbrk = (void *) INTERNAL_SYSCALL_CALL (brk, addr);
__curbrk = newbrk;
if (newbrk < addr)
return INLINE_SYSCALL_ERROR_RETURN_VALUE (ENOMEM);
return 0;
}
weak_alias (__brk, brk)
#include <sysdeps/unix/sysv/linux/brk.c>

3
sysdeps/unix/sysv/linux/i386/sysdep.h
View File

@ -291,6 +291,9 @@ struct libc_do_syscall_args
# define HAVE_TIME_VSYSCALL "__vdso_time"
# define HAVE_CLOCK_GETRES_VSYSCALL "__vdso_clock_getres"
# undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
# define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
/* Define a macro which expands inline into the wrapper code for a system
call. This use is for internal calls that do not need to handle errors
normally. It will never touch errno. This returns just what the kernel

50
sysdeps/unix/sysv/linux/ia64/brk.S
View File

@ -1,50 +0,0 @@
/* brk system call for Linux/ia64
Copyright (C) 1999-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Written by Stéphane Eranian <eranian@hpl.hp.com> and
Jes Sorensen, <Jes.Sorensen@cern.ch>, April 1999.
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 <sysdep.h>
#include <asm/errno.h>
.global __curbrk
.type __curbrk,@object
.size __curbrk,8
.data
.align 8
__curbrk:
data8 0
weak_alias (__curbrk, ___brk_addr)
LEAF(__brk)
.regstk 1, 0, 0, 0
DO_CALL(__NR_brk)
cmp.ltu p6, p0 = ret0, in0
addl r9 = @ltoff(__curbrk), gp
;;
ld8 r9 = [r9]
(p6) mov ret0 = ENOMEM
(p6) br.cond.spnt.few __syscall_error
;;
st8 [r9] = ret0
mov ret0 = 0
ret
END(__brk)
weak_alias (__brk, brk)

1
sysdeps/unix/sysv/linux/ia64/dl-brk.S
View File

@ -1 +0,0 @@
#include <brk.S>

3
sysdeps/unix/sysv/linux/ia64/sysdep.h
View File

@ -172,6 +172,9 @@
#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)

46
sysdeps/unix/sysv/linux/m68k/brk.c
View File

@ -1,46 +0,0 @@
/* brk system call for Linux/m68k.
Copyright (C) 1996-2020 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/>. */
#include <errno.h>
#include <unistd.h>
#include <sysdep.h>
void *__curbrk = 0;
/* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt
to work around different old braindamage in the old Linux/x86 ELF
dynamic linker. Sigh. */
weak_alias (__curbrk, ___brk_addr)
int
__brk (void *addr)
{
void *newbrk;
newbrk = (void *) INTERNAL_SYSCALL_CALL (brk, addr);
__curbrk = newbrk;
if (newbrk < addr)
{
__set_errno (ENOMEM);
return -1;
}
return 0;
}
weak_alias (__brk, brk)

3
sysdeps/unix/sysv/linux/m68k/sysdep.h
View File

@ -292,6 +292,9 @@ SYSCALL_ERROR_LABEL: \
LOAD_REGS_5
#define ASM_ARGS_6 ASM_ARGS_5, "a" (_a0)
#undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
#endif /* not __ASSEMBLER__ */
/* Pointer mangling is not yet supported for M68K. */

42
sysdeps/unix/sysv/linux/microblaze/brk.c
View File

@ -1,42 +0,0 @@
/* Copyright (C) 2011-2020 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/>. */
#include <errno.h>
#include <unistd.h>
#include <sysdep.h>
/* This must be initialized data because commons can't have aliases. */
void *__curbrk = 0;
/* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt
to work around different old braindamage in the old Linux ELF dynamic
linker. */
weak_alias (__curbrk, ___brk_addr)
int
__brk (void *addr)
{
__curbrk = (void *) INTERNAL_SYSCALL_CALL (brk, addr);
if (__curbrk < addr)
{
__set_errno (ENOMEM);
return -1;
}
return 0;
}
weak_alias (__brk, brk)

3
sysdeps/unix/sysv/linux/microblaze/sysdep.h
View File

@ -310,6 +310,9 @@ SYSCALL_ERROR_LABEL_DCL: \
# define SINGLE_THREAD_BY_GLOBAL 1
#undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
#endif /* not __ASSEMBLER__ */
#endif /* _LINUX_MICROBLAZE_SYSDEP_H */

46
sysdeps/unix/sysv/linux/mips/brk.c
View File

@ -1,46 +0,0 @@
/* brk system call for Linux/MIPS.
Copyright (C) 2000-2020 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/>. */
#include <errno.h>
#include <unistd.h>
#include <sysdep.h>
void *__curbrk = 0;
/* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt
to work around different old braindamage in the old Linux/x86 ELF
dynamic linker. Sigh. */
weak_alias (__curbrk, ___brk_addr)
int
__brk (void *addr)
{
void *newbrk;
newbrk = (void *) INTERNAL_SYSCALL_CALL (brk, addr);
__curbrk = newbrk;
if (newbrk < addr)
{
__set_errno (ENOMEM);
return -1;
}
return 0;
}
weak_alias (__brk, brk)

3
sysdeps/unix/sysv/linux/mips/mips32/sysdep.h
View File

@ -43,6 +43,9 @@
#else /* ! __ASSEMBLER__ */
#undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
/* Note that the original Linux syscall restart convention required the
instruction immediately preceding SYSCALL to initialize $v0 with the
syscall number. Then if a restart triggered, $v0 would have been

3
sysdeps/unix/sysv/linux/mips/mips64/sysdep.h
View File

@ -41,6 +41,9 @@
#else /* ! __ASSEMBLER__ */
#undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
#if _MIPS_SIM == _ABIN32
/* Convert X to a long long, without losing any bits if it is one
already or warning if it is a 32-bit pointer. */

3
sysdeps/unix/sysv/linux/nios2/sysdep.h
View File

@ -219,6 +219,9 @@
#define __SYSCALL_CLOBBERS "memory"
#undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
#endif /* __ASSEMBLER__ */
/* Pointer mangling support. */

1
sysdeps/unix/sysv/linux/powerpc/dl-brk.S
View File

@ -1 +0,0 @@
#include <brk.S>

52
sysdeps/unix/sysv/linux/powerpc/powerpc32/brk.S
View File

@ -1,52 +0,0 @@
/* brk system call for Linux/ppc.
Copyright (C) 1995-2020 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/>. */
#include <sysdep.h>
#define _ERRNO_H 1
#include <bits/errno.h>
.comm __curbrk,4,4
.section ".text"
ENTRY (__brk)
mflr r0
stwu r1,-16(r1)
cfi_adjust_cfa_offset (16)
stw r3,8(r1)
stw r0,20(r1)
cfi_offset (lr, 4)
DO_CALL(SYS_ify(brk))
lwz r6,8(r1)
#ifdef PIC
SETUP_GOT_ACCESS(r5,got_label)
addis r5,r5,__curbrk-got_label@ha
stw r3,__curbrk-got_label@l(r5)
#else
lis r4,__curbrk@ha
stw r3,__curbrk@l(r4)
#endif
lwz r0,20(r1)
cmplw r6,r3
addi r1,r1,16
mtlr r0
li r3,0
blelr+
li r3,ENOMEM
b __syscall_error@local
END (__brk)
weak_alias (__brk, brk)

43
sysdeps/unix/sysv/linux/powerpc/powerpc64/brk.S
View File

@ -1,43 +0,0 @@
/* brk system call for Linux. PowerPC64 version.
Copyright (C) 1995-2020 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/>. */
#include <sysdep.h>
#define _ERRNO_H 1
#include <bits/errno.h>
.comm __curbrk,8,8
.section ".toc","aw"
.LC__curbrk:
.tc __curbrk[TC],__curbrk
.section ".text"
ENTRY (__brk)
CALL_MCOUNT 1
std r3,-8(r1)
DO_CALL(SYS_ify(brk))
ld r6,-8(r1)
ld r5,.LC__curbrk@toc(r2)
std r3,0(r5)
cmpld r6,r3
li r3,0
blelr+
li r3,ENOMEM
TAIL_CALL_SYSCALL_ERROR
END (__brk)
weak_alias (__brk, brk)

3
sysdeps/unix/sysv/linux/riscv/sysdep.h
View File

@ -155,6 +155,9 @@
RV64). */
# define HAVE_GETCPU_VSYSCALL "__vdso_getcpu"
# undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
# define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
# define INTERNAL_SYSCALL(name, nr, args...) \
internal_syscall##nr (SYS_ify (name), args)

55
sysdeps/unix/sysv/linux/s390/brk.c
View File

@ -1,55 +0,0 @@
/*
Copyright (C) 2000-2020 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
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <unistd.h>
#include <sysdep.h>
void *__curbrk = 0;
/* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt
to work around different old braindamage in the old Linux/x86 ELF
dynamic linker. Sigh. */
weak_alias (__curbrk, ___brk_addr)
int
__brk (void *addr)
{
void *newbrk;
{
register void *__addr __asm__("2") = addr;
__asm__ ("svc %b1\n\t" /* call sys_brk */
: "=d" (__addr)
: "I" (SYS_ify(brk)), "r" (__addr)
: "cc", "memory" );
newbrk = __addr;
}
__curbrk = newbrk;
if (newbrk < addr)
{
__set_errno (ENOMEM);
return -1;
}
return 0;
}
weak_alias (__brk, brk)

5
sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
View File

@ -175,6 +175,11 @@
#define ret_ERRVAL \
br 14
#else
# undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
# define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
#endif /* __ASSEMBLER__ */
/* Pointer mangling support. */

5
sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
View File

@ -173,6 +173,11 @@
#define ret_ERRVAL \
br 14
#else
# undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
# define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
#endif /* __ASSEMBLER__ */
/* Pointer mangling support. */

47
sysdeps/unix/sysv/linux/sh/brk.c
View File

@ -1,47 +0,0 @@
/* brk system call for Linux/SH.
Copyright (C) 1999-2020 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/>. */
#include <errno.h>
#include <unistd.h>
#include <sysdep.h>
/* This must be initialized data because commons can't have aliases. */
void *__curbrk = 0;
int
__brk (void *addr)
{
void *newbrk;
register long r3 asm ("%r3") = SYS_ify (brk);
register long r4 asm ("%r4") = (long)addr;
asm volatile ("trapa #0x11\n\t" SYSCALL_INST_PAD
: "=z"(newbrk)
: "r" (r3), "r" (r4));
__curbrk = newbrk;
if (newbrk < addr)
{
__set_errno (ENOMEM);
return -1;
}
return 0;
}
weak_alias (__brk, brk)

54
sysdeps/unix/sysv/linux/sparc/sparc32/brk.c
View File

@ -1,54 +0,0 @@
/* brk system call for Linux/SPARC.
Copyright (C) 1995-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Miguel de Icaza (miguel@nuclecu.unam.mx)
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 <errno.h>
#include <unistd.h>
#include <sysdep.h>
/* This must be initialized data because commons can't have aliases. */
void *__curbrk = 0;
/* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt
to work around different old braindamage in the old Linux ELF dynamic
linker. */
weak_alias (__curbrk, ___brk_addr)
int
__brk (void *addr)
{
void *newbrk;
{
register void *o0 __asm__("%o0") = addr;
register int g1 __asm__("%g1") = __NR_brk;
__asm ("t 0x10" : "=r"(o0) : "r"(g1), "0"(o0) : "cc");
newbrk = o0;
}
__curbrk = newbrk;
if (newbrk < addr)
{
__set_errno (ENOMEM);
return -1;
}
return 0;
}
weak_alias (__brk, brk)

3
sysdeps/unix/sysv/linux/sparc/sparc32/sysdep.h
View File

@ -121,6 +121,9 @@ ENTRY(name); \
"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \
"cc", "memory"
#undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
#endif /* __ASSEMBLER__ */
/* Pointer mangling support. */

104
sysdeps/unix/sysv/linux/sparc/sparc64/brk.S
View File

@ -1,104 +0,0 @@
/* Copyright (C) 1997-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Richard Henderson <richard@gnu.ai.mit.edu>, 1997.
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/>. */
/* __brk is a special syscall under Linux since it never returns an
error. Instead, the error condition is indicated by returning the old
break value (instead of the new, requested one). */
#include <sysdep.h>
#include <errno.h>
#ifdef PIC
.section .bss
.align 8
.globl __curbrk
__curbrk: .skip 8
.type __curbrk,@object
.size __curbrk,8
#else
.common __curbrk, 8, 8
#endif
.text
ENTRY (__brk)
save %sp, -192, %sp
cfi_def_cfa_register(%fp)
cfi_window_save
cfi_register(%o7, %i7)
#ifdef PIC
SETUP_PIC_REG(l7)
#endif
LOADSYSCALL(brk)
mov %i0, %o0
ta 0x6d
/* All the ways we can fail... */
bcs,pn %xcc, .Lerr1
nop
brz,pt %i0, .Lok
subcc %i0, %o0, %g0
bne,pn %xcc, .Lerr0
nop
/* Update __curbrk and return cleanly. */
.Lok:
#ifndef PIC
sethi %hi(__curbrk), %g1
or %g1, %lo(__curbrk), %g1
#else
sethi %gdop_hix22(__curbrk), %g1
xor %g1, %gdop_lox10(__curbrk), %g1
ldx [%l7 + %g1], %g1, %gdop(__curbrk)
#endif
stx %o0, [%g1]
mov %g0, %i0
/* Don't use "ret" cause the preprocessor will eat it. */
jmpl %i7+8, %g0
restore
/* What a horrible way to die. */
.Lerr0: set ENOMEM, %o0
.Lerr1:
#ifndef _LIBC_REENTRANT
#ifndef PIC
sethi %hi(errno), %g1
or %g1, %lo(errno), %g1
#else
sethi %gdop_hix22(errno), %g1
xor %g1, %gdop_lox10(errno), %g1
ldx [%l7 + %g1], %g1, %gdop(errno)
#endif
st %o0, [%g1]
#else
#if IS_IN (libc)
call HIDDEN_JUMPTARGET(__errno_location)
#else
call __errno_location
#endif
mov %o0,%l1
st %l1, [%o0]
#endif
sub %g0, 1, %i0
jmpl %i7+8, %g0
restore
END (__brk)
weak_alias (__brk, brk)

1
sysdeps/unix/sysv/linux/sparc/sparc64/dl-brk.S
View File

@ -1 +0,0 @@
#include <brk.S>

4
sysdeps/unix/sysv/linux/sysdep.h
View File

@ -99,4 +99,8 @@
it missing due the usage of a old generic version without it). */
#define HAVE_INTERNAL_SEND_SYMBOL 1
/* Export the ___brk_addr symbol on brk.c implementation (some ABIs export
it due and old crtstuff.c code). */
#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 0
#endif /* _SYSDEP_LINUX_H */

41
sysdeps/unix/sysv/linux/x86_64/brk.c
View File

@ -1,41 +0,0 @@
/* brk system call for Linux/x86_64.
Copyright (C) 1995-2020 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/>. */
#include <errno.h>
#include <unistd.h>
#include <sysdep.h>
/* This must be initialized data because commons can't have aliases. */
void *__curbrk = 0;
int
__brk (void *addr)
{
void *newbrk;
__curbrk = newbrk = (void *) INLINE_SYSCALL (brk, 1, addr);
if (newbrk < addr)
{
__set_errno (ENOMEM);
return -1;
}
return 0;
}
weak_alias (__brk, brk)