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8b8a692cfd
This updates glibc for the changes in the ELFv2 relating to the stack frame layout. These are described in more detail here: http://gcc.gnu.org/ml/gcc-patches/2013-11/msg01149.html http://gcc.gnu.org/ml/gcc-patches/2013-11/msg01146.html Specifically, the "compiler and linker doublewords" were removed, which has the effect that the save slot for the TOC register is now at offset 24 rather than 40 to the stack pointer. In addition, a function may now no longer necessarily assume that its caller has set up a 64-byte register save area its use. To address the first change, the patch goes through all assembler files and replaces immediate offsets in instructions accessing the ABI-defined stack slots by symbolic offsets. Those already were defined in ucontext_i.sym and used in some of the context routines, but that doesn't really seem like the right place for those defines. The patch instead defines those symbolic offsets in sysdeps.h, in two variants for the old and new ABI, and uses them systematically in all assembler files, not just the context routines. The second change only affected a few assembler files that used the save area to temporarily store some registers. In those cases where this happens within a leaf function, this patch changes the code to store those registers to the "red zone" below the stack pointer. Otherwise, the functions already allocate a stack frame, and the patch changes them to add extra space in these frames as temporary space for the ELFv2 ABI.
135 lines
3.3 KiB
ArmAsm
135 lines
3.3 KiB
ArmAsm
/* Copyright (C) 1995-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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see <http://www.gnu.org/licenses/>. */
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#include <sysdep-cancel.h>
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#include <socketcall.h>
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#define P(a, b) P2(a, b)
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#define P2(a, b) a##b
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/* The socket-oriented system calls are handled unusally in Linux.
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They are all gated through the single `socketcall' system call number.
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`socketcall' takes two arguments: the first is the subcode, specifying
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which socket function is being called; and the second is a pointer to
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the arguments to the specific function.
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The .S files for the other calls just #define socket and #include this.
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They also #define a 'number-of-arguments' word in NARGS, which
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defaults to 3. */
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#ifndef NARGS
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#ifdef socket
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#error NARGS not defined
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#endif
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#define NARGS 3
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#endif
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#ifndef __socket
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# ifndef NO_WEAK_ALIAS
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# define __socket P(__,socket)
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# else
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# define __socket socket
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# endif
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#endif
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#if _CALL_ELF == 2
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#define FRAMESIZE (FRAME_MIN_SIZE+16+64)
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#define stackblock (FRAME_MIN_SIZE+16)
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#else
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#define FRAMESIZE (FRAME_MIN_SIZE+16)
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#define stackblock (FRAMESIZE+FRAME_PARM_SAVE) /* offset to parm save area. */
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#endif
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.text
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ENTRY(__socket)
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CALL_MCOUNT NARGS
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stdu r1,-FRAMESIZE(r1)
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cfi_adjust_cfa_offset(FRAMESIZE)
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#if NARGS >= 1
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std r3,stackblock(r1)
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#endif
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#if NARGS >= 2
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std r4,8+stackblock(r1)
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#endif
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#if NARGS >= 3
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std r5,16+stackblock(r1)
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#endif
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#if NARGS >= 4
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std r6,24+stackblock(r1)
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#endif
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#if NARGS >= 5
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std r7,32+stackblock(r1)
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#endif
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#if NARGS >= 6
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std r8,40+stackblock(r1)
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#endif
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#if NARGS >= 7
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std r9,48+stackblock(r1)
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#endif
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#if NARGS >= 8
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std r10,56+stackblock(r1)
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#endif
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#if NARGS >= 9
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#error too many arguments!
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#endif
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#if defined NEED_CANCELLATION && defined CENABLE
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SINGLE_THREAD_P
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bne- .Lsocket_cancel
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#endif
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li r3,P(SOCKOP_,socket)
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addi r4,r1,stackblock
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DO_CALL(SYS_ify(socketcall))
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addi r1,r1,FRAMESIZE
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cfi_adjust_cfa_offset(-FRAMESIZE)
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PSEUDO_RET
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#if defined NEED_CANCELLATION && defined CENABLE
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.Lsocket_cancel:
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cfi_adjust_cfa_offset(FRAMESIZE)
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mflr r9
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std r9,FRAMESIZE+FRAME_LR_SAVE(r1)
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cfi_offset (lr, FRAME_LR_SAVE)
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CENABLE
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std r3,FRAME_MIN_SIZE+8(r1)
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li r3,P(SOCKOP_,socket)
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addi r4,r1,stackblock
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DO_CALL(SYS_ify(socketcall))
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mfcr r0
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std r3,FRAME_MIN_SIZE(r1)
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std r0,FRAMESIZE+FRAME_CR_SAVE(r1)
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cfi_offset (cr, FRAME_CR_SAVE)
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ld r3,FRAME_MIN_SIZE+8(r1)
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CDISABLE
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ld r4,FRAMESIZE+FRAME_LR_SAVE(r1)
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ld r0,FRAMESIZE+FRAME_CR_SAVE(r1)
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ld r3,FRAME_MIN_SIZE(r1)
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mtlr r4
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mtcr r0
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addi r1,r1,FRAMESIZE
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cfi_adjust_cfa_offset(-FRAMESIZE)
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cfi_restore(lr)
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cfi_restore(cr)
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PSEUDO_RET
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#endif
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PSEUDO_END (__socket)
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#ifndef NO_WEAK_ALIAS
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weak_alias (__socket, socket)
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#endif
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