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m68k updates for v6.14

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- Use the generic muldi3 libgcc function,
   - Miscellaneous fixes and improvements.
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Merge tag 'm68k-for-v6.14-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k

Pull m68k updates from Geert Uytterhoeven:

 - Use the generic muldi3 libgcc function

 - Miscellaneous fixes and improvements

* tag 'm68k-for-v6.14-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k:
  m68k: libgcc: Fix lvalue abuse in umul_ppmm()
  m68k: vga: Fix I/O defines
  zorro: Constify 'struct bin_attribute'
  m68k: atari: Use str_on_off() helper in atari_nvram_proc_read()
  m68k: Use kernel's generic muldi3 libgcc function
This commit is contained in:
Linus Torvalds 2025-01-20 21:18:36 -08:00
commit e7244cc382
9 changed files with 55 additions and 109 deletions
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8
arch/Kconfig
View file

@ -1526,6 +1526,14 @@ config HAVE_ARCH_COMPILER_H
linux/compiler-*.h in order to override macro definitions that those
headers generally provide.
config HAVE_ARCH_LIBGCC_H
bool
help
An architecture can select this if it provides an
asm/libgcc.h header that should be included after
linux/libgcc.h in order to override macro definitions that
header generally provides.
config HAVE_ARCH_PREL32_RELOCATIONS
bool
help

2
arch/m68k/Kconfig
View file

@ -23,7 +23,9 @@ config M68K
select GENERIC_LIB_ASHLDI3
select GENERIC_LIB_ASHRDI3
select GENERIC_LIB_LSHRDI3
select GENERIC_LIB_MULDI3
select HAS_IOPORT if PCI || ISA || ATARI_ROM_ISA
select HAVE_ARCH_LIBGCC_H
select HAVE_ARCH_SECCOMP
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ASM_MODVERSIONS

6
arch/m68k/atari/nvram.c
View file

@ -16,7 +16,9 @@
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/spinlock.h>
#include <linux/string_choices.h>
#include <linux/types.h>
#include <asm/atarihw.h>
#include <asm/atariints.h>
@ -198,7 +200,7 @@ static void atari_nvram_proc_read(unsigned char *nvram, struct seq_file *seq,
seq_printf(seq, "0x%02x (undefined)\n", nvram[1]);
seq_printf(seq, "SCSI arbitration : %s\n",
(nvram[16] & 0x80) ? "on" : "off");
str_on_off(nvram[16] & 0x80));
seq_puts(seq, "SCSI host ID : ");
if (nvram[16] & 0x80)
seq_printf(seq, "%d\n", nvram[16] & 7);
@ -236,7 +238,7 @@ static void atari_nvram_proc_read(unsigned char *nvram, struct seq_file *seq,
vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC");
seq_printf(seq,
" %soverscan, compat. mode %s%s\n",
vmode & 64 ? "" : "no ", vmode & 128 ? "on" : "off",
vmode & 64 ? "" : "no ", str_on_off(vmode & 128),
vmode & 256 ?
(vmode & 16 ? ", line doubling" : ", half screen") : "");
}

27
arch/m68k/include/asm/libgcc.h Normal file
View file

@ -0,0 +1,27 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_M68K_LIBGCC_H
#define __ASM_M68K_LIBGCC_H
#ifndef CONFIG_CPU_HAS_NO_MULDIV64
/*
* For those 68K CPUs that support 64bit multiply define umul_ppm()
* for the common muldi3 libgcc helper function (in lib/muldi3.c).
* CPUs that don't have it (like the original 68000 and ColdFire)
* will fallback to using the C-coded version of umul_ppmm().
*/
#define umul_ppmm(w1, w0, u, v) \
do { \
unsigned long __u = (u), __v = (v); \
unsigned long __w0, __w1; \
\
__asm__ ("mulu%.l %3,%1:%0" \
: "=d" (__w0), \
"=d" (__w1) \
: "%0" (__u), \
"dmi" (__v)); \
\
(w0) = __w0; (w1) = __w1; \
} while (0)
#endif /* !CONFIG_CPU_HAS_NO_MULDIV64 */
#endif /* __ASM_M68K_LIBGCC_H */

8
arch/m68k/include/asm/vga.h
View file

@ -9,7 +9,7 @@
*/
#ifndef CONFIG_PCI
#include <asm/raw_io.h>
#include <asm/io.h>
#include <asm/kmap.h>
/*
@ -29,9 +29,9 @@
#define inw_p(port) 0
#define outb_p(port, val) do { } while (0)
#define outw(port, val) do { } while (0)
#define readb raw_inb
#define writeb raw_outb
#define writew raw_outw
#define readb __raw_readb
#define writeb __raw_writeb
#define writew __raw_writew
#endif /* CONFIG_PCI */
#endif /* _ASM_M68K_VGA_H */

2
arch/m68k/lib/Makefile
View file

@ -4,7 +4,7 @@
# Makefile for m68k-specific library files..
#
lib-y := muldi3.o memcpy.o memset.o memmove.o
lib-y := memcpy.o memset.o memmove.o
lib-$(CONFIG_MMU) += uaccess.o
lib-$(CONFIG_CPU_HAS_NO_MULDIV64) += mulsi3.o divsi3.o udivsi3.o

97
arch/m68k/lib/muldi3.c
View file

@ -1,97 +0,0 @@
/* muldi3.c extracted from gcc-2.7.2.3/libgcc2.c and
gcc-2.7.2.3/longlong.h which is: */
/* Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU CC 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 General Public License for more details. */
#include <linux/compiler.h>
#include <linux/export.h>
#include <linux/libgcc.h>
#ifdef CONFIG_CPU_HAS_NO_MULDIV64
#define SI_TYPE_SIZE 32
#define __BITS4 (SI_TYPE_SIZE / 4)
#define __ll_B (1L << (SI_TYPE_SIZE / 2))
#define __ll_lowpart(t) ((USItype) (t) % __ll_B)
#define __ll_highpart(t) ((USItype) (t) / __ll_B)
#define umul_ppmm(w1, w0, u, v) \
do { \
USItype __x0, __x1, __x2, __x3; \
USItype __ul, __vl, __uh, __vh; \
\
__ul = __ll_lowpart (u); \
__uh = __ll_highpart (u); \
__vl = __ll_lowpart (v); \
__vh = __ll_highpart (v); \
\
__x0 = (USItype) __ul * __vl; \
__x1 = (USItype) __ul * __vh; \
__x2 = (USItype) __uh * __vl; \
__x3 = (USItype) __uh * __vh; \
\
__x1 += __ll_highpart (__x0);/* this can't give carry */ \
__x1 += __x2; /* but this indeed can */ \
if (__x1 < __x2) /* did we get it? */ \
__x3 += __ll_B; /* yes, add it in the proper pos. */ \
\
(w1) = __x3 + __ll_highpart (__x1); \
(w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0); \
} while (0)
#else
#define umul_ppmm(w1, w0, u, v) \
__asm__ ("mulu%.l %3,%1:%0" \
: "=d" ((USItype)(w0)), \
"=d" ((USItype)(w1)) \
: "%0" ((USItype)(u)), \
"dmi" ((USItype)(v)))
#endif
#define __umulsidi3(u, v) \
({DIunion __w; \
umul_ppmm (__w.s.high, __w.s.low, u, v); \
__w.ll; })
typedef int SItype __mode(SI);
typedef unsigned int USItype __mode(SI);
typedef int DItype __mode(DI);
typedef int word_type __mode(__word__);
struct DIstruct {SItype high, low;};
typedef union
{
struct DIstruct s;
DItype ll;
} DIunion;
DItype
__muldi3 (DItype u, DItype v)
{
DIunion w;
DIunion uu, vv;
uu.ll = u;
vv.ll = v;
w.ll = __umulsidi3 (uu.s.low, vv.s.low);
w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
+ (USItype) uu.s.high * (USItype) vv.s.low);
return w.ll;
}
EXPORT_SYMBOL(__muldi3);

10
drivers/zorro/zorro-sysfs.c
View file

@ -81,7 +81,7 @@ static struct attribute *zorro_device_attrs[] = {
};
static ssize_t zorro_read_config(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr,
const struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t count)
{
struct zorro_dev *z = to_zorro_dev(kobj_to_dev(kobj));
@ -98,23 +98,23 @@ static ssize_t zorro_read_config(struct file *filp, struct kobject *kobj,
return memory_read_from_buffer(buf, count, &off, &cd, sizeof(cd));
}
static struct bin_attribute zorro_config_attr = {
static const struct bin_attribute zorro_config_attr = {
.attr = {
.name = "config",
.mode = S_IRUGO,
},
.size = sizeof(struct ConfigDev),
.read = zorro_read_config,
.read_new = zorro_read_config,
};
static struct bin_attribute *zorro_device_bin_attrs[] = {
static const struct bin_attribute *const zorro_device_bin_attrs[] = {
&zorro_config_attr,
NULL
};
static const struct attribute_group zorro_device_attr_group = {
.attrs = zorro_device_attrs,
.bin_attrs = zorro_device_bin_attrs,
.bin_attrs_new = zorro_device_bin_attrs,
};
const struct attribute_group *zorro_device_attribute_groups[] = {

4
include/linux/libgcc.h
View file

@ -34,4 +34,8 @@ long long notrace __lshrdi3(long long u, word_type b);
long long notrace __muldi3(long long u, long long v);
word_type notrace __ucmpdi2(unsigned long long a, unsigned long long b);
#ifdef CONFIG_HAVE_ARCH_LIBGCC_H
#include <asm/libgcc.h>
#endif
#endif /* __ASM_LIBGCC_H */