mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 04:50:07 +00:00
688903eb3e
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
164 lines
3.9 KiB
C
164 lines
3.9 KiB
C
/* Copyright (C) 2004-2018 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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
/* Common bits for implementing software divide. */
|
|
|
|
#include <sysdep.h>
|
|
#ifdef __linux__
|
|
# include <asm/gentrap.h>
|
|
# include <asm/pal.h>
|
|
#else
|
|
# include <machine/pal.h>
|
|
#endif
|
|
|
|
/* These are not normal C functions. Argument registers are t10 and t11;
|
|
the result goes in t12; the return address is in t9. Only t12 and AT
|
|
may be clobbered. */
|
|
#define X t10
|
|
#define Y t11
|
|
#define RV t12
|
|
#define RA t9
|
|
|
|
/* The secureplt format does not allow the division routines to be called
|
|
via plt; there aren't enough registers free to be clobbered. Avoid
|
|
setting the symbol type to STT_FUNC, so that the linker won't be tempted
|
|
to create a plt entry. */
|
|
#define funcnoplt notype
|
|
|
|
/* None of these functions should use implicit anything. */
|
|
.set nomacro
|
|
.set noat
|
|
|
|
/* Code fragment to invoke _mcount for profiling. This should be invoked
|
|
directly after allocation of the stack frame. */
|
|
.macro CALL_MCOUNT
|
|
#ifdef PROF
|
|
stq ra, 0(sp)
|
|
stq pv, 8(sp)
|
|
stq gp, 16(sp)
|
|
cfi_rel_offset (ra, 0)
|
|
cfi_rel_offset (pv, 8)
|
|
cfi_rel_offset (gp, 16)
|
|
br AT, 1f
|
|
.set macro
|
|
1: ldgp gp, 0(AT)
|
|
mov RA, ra
|
|
lda AT, _mcount
|
|
jsr AT, (AT), _mcount
|
|
.set nomacro
|
|
ldq ra, 0(sp)
|
|
ldq pv, 8(sp)
|
|
ldq gp, 16(sp)
|
|
cfi_restore (ra)
|
|
cfi_restore (pv)
|
|
cfi_restore (gp)
|
|
/* Realign subsequent code with what we'd have without this
|
|
macro at all. This means aligned with one arithmetic insn
|
|
used within the bundle. */
|
|
.align 4
|
|
nop
|
|
#endif
|
|
.endm
|
|
|
|
/* In order to make the below work, all top-level divide routines must
|
|
use the same frame size. */
|
|
#define FRAME 64
|
|
|
|
/* Code fragment to generate an integer divide-by-zero fault. When
|
|
building libc.so, we arrange for there to be one copy of this code
|
|
placed late in the dso, such that all branches are forward. When
|
|
building libc.a, we use multiple copies to avoid having an out of
|
|
range branch. Users should jump to DIVBYZERO. */
|
|
|
|
.macro DO_DIVBYZERO
|
|
#ifdef PIC
|
|
#define DIVBYZERO __divbyzero
|
|
.section .gnu.linkonce.t.divbyzero, "ax", @progbits
|
|
.globl __divbyzero
|
|
.type __divbyzero, @function
|
|
.usepv __divbyzero, no
|
|
.hidden __divbyzero
|
|
#else
|
|
#define DIVBYZERO $divbyzero
|
|
#endif
|
|
|
|
.align 4
|
|
DIVBYZERO:
|
|
cfi_startproc
|
|
cfi_return_column (RA)
|
|
cfi_def_cfa_offset (FRAME)
|
|
|
|
mov a0, RV
|
|
unop
|
|
lda a0, GEN_INTDIV
|
|
call_pal PAL_gentrap
|
|
|
|
mov RV, a0
|
|
clr RV
|
|
lda sp, FRAME(sp)
|
|
cfi_def_cfa_offset (0)
|
|
ret $31, (RA), 1
|
|
|
|
cfi_endproc
|
|
.size DIVBYZERO, .-DIVBYZERO
|
|
.endm
|
|
|
|
/* Like the ev6 instructions, but fall back to stack use on prior machines. */
|
|
|
|
.arch ev6
|
|
|
|
.macro _ITOFS gr, fr, slot
|
|
#ifdef __alpha_fix__
|
|
itofs \gr, \fr
|
|
#else
|
|
stl \gr, \slot(sp)
|
|
lds \fr, \slot(sp)
|
|
#endif
|
|
.endm
|
|
|
|
.macro _ITOFT gr, fr, slot
|
|
#ifdef __alpha_fix__
|
|
itoft \gr, \fr
|
|
#else
|
|
stq \gr, \slot(sp)
|
|
ldt \fr, \slot(sp)
|
|
#endif
|
|
.endm
|
|
|
|
.macro _FTOIT fr, gr, slot
|
|
#ifdef __alpha_fix__
|
|
ftoit \fr, \gr
|
|
#else
|
|
stt \fr, \slot(sp)
|
|
ldq \gr, \slot(sp)
|
|
#endif
|
|
.endm
|
|
|
|
/* Similarly, but move two registers. Schedules better for pre-ev6. */
|
|
|
|
.macro _ITOFT2 gr1, fr1, slot1, gr2, fr2, slot2
|
|
#ifdef __alpha_fix__
|
|
itoft \gr1, \fr1
|
|
itoft \gr2, \fr2
|
|
#else
|
|
stq \gr1, \slot1(sp)
|
|
stq \gr2, \slot2(sp)
|
|
ldt \fr1, \slot1(sp)
|
|
ldt \fr2, \slot2(sp)
|
|
#endif
|
|
.endm
|