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Code Issues Releases Wiki Activity

m68k updates for v5.15 (take three) 

- Signal handling fixes,
   - Removal of set_fs().
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Merge tag 'm68k-for-v5.15-tag3' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k

Pull more m68k updates from Geert Uytterhoeven:

 - signal handling fixes

 - removal of set_fs()

[ The set_fs removal isn't strictly a fix, but it's been pending for a
  while and is very welcome. The signal handling fixes resolved an issue
  that was incorrectly attributed to the set_fs changes    - Linus ]

* tag 'm68k-for-v5.15-tag3' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k:
  m68k: Remove set_fs()
  m68k: Provide __{get,put}_kernel_nofault
  m68k: Factor the 8-byte lowlevel {get,put}_user code into helpers
  m68k: Use BUILD_BUG for passing invalid sizes to get_user/put_user
  m68k: Remove the 030 case in virt_to_phys_slow
  m68k: Document that access_ok is broken for !CONFIG_CPU_HAS_ADDRESS_SPACES
  m68k: Leave stack mangling to asm wrapper of sigreturn()
  m68k: Update ->thread.esp0 before calling syscall_trace() in ret_from_signal
  m68k: Handle arrivals of multiple signals correctly
This commit is contained in:
Linus Torvalds 2021-09-28 13:24:43 -07:00
parent dca50f08a0 9fde034864
commit e7bd807e8c
24 changed files with 300 additions and 353 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/m68k/68000/entry.S
View File

@ -15,7 +15,6 @@
#include <asm/unistd.h>
#include <asm/errno.h>
#include <asm/setup.h>
#include <asm/segment.h>
#include <asm/traps.h>
#include <asm/asm-offsets.h>
#include <asm/entry.h>
@ -25,7 +24,6 @@
.globl system_call
.globl resume
.globl ret_from_exception
.globl ret_from_signal
.globl sys_call_table
.globl bad_interrupt
.globl inthandler1
@ -59,8 +57,6 @@ do_trace:
subql #4,%sp /* dummy return address */
SAVE_SWITCH_STACK
jbsr syscall_trace_leave
ret_from_signal:
RESTORE_SWITCH_STACK
addql #4,%sp
jra ret_from_exception

1
arch/m68k/Kconfig
View File

@ -29,7 +29,6 @@ config M68K
select NO_DMA if !MMU && !COLDFIRE
select OLD_SIGACTION
select OLD_SIGSUSPEND3
select SET_FS
select UACCESS_MEMCPY if !MMU
select VIRT_TO_BUS
select ZONE_DMA

4
arch/m68k/coldfire/entry.S
View File

@ -31,7 +31,6 @@
#include <asm/thread_info.h>
#include <asm/errno.h>
#include <asm/setup.h>
#include <asm/segment.h>
#include <asm/asm-offsets.h>
#include <asm/entry.h>
@ -51,7 +50,6 @@ sw_usp:
.globl system_call
.globl resume
.globl ret_from_exception
.globl ret_from_signal
.globl sys_call_table
.globl inthandler
@ -98,8 +96,6 @@ ENTRY(system_call)
subql #4,%sp /* dummy return address */
SAVE_SWITCH_STACK
jbsr syscall_trace_leave
ret_from_signal:
RESTORE_SWITCH_STACK
addql #4,%sp

31
arch/m68k/include/asm/processor.h
View File

@ -9,7 +9,6 @@
#define __ASM_M68K_PROCESSOR_H
#include <linux/thread_info.h>
#include <asm/segment.h>
#include <asm/fpu.h>
#include <asm/ptrace.h>
@ -75,11 +74,37 @@ static inline void wrusp(unsigned long usp)
#define TASK_UNMAPPED_BASE 0
#endif
/* Address spaces (or Function Codes in Motorola lingo) */
#define USER_DATA 1
#define USER_PROGRAM 2
#define SUPER_DATA 5
#define SUPER_PROGRAM 6
#define CPU_SPACE 7
#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES
/*
* Set the SFC/DFC registers for special MM operations. For most normal
* operation these remain set to USER_DATA for the uaccess routines.
*/
static inline void set_fc(unsigned long val)
{
WARN_ON_ONCE(in_interrupt());
__asm__ __volatile__ ("movec %0,%/sfc\n\t"
"movec %0,%/dfc\n\t"
: /* no outputs */ : "r" (val) : "memory");
}
#else
static inline void set_fc(unsigned long val)
{
}
#endif /* CONFIG_CPU_HAS_ADDRESS_SPACES */
struct thread_struct {
unsigned long ksp; /* kernel stack pointer */
unsigned long usp; /* user stack pointer */
unsigned short sr; /* saved status register */
unsigned short fs; /* saved fs (sfc, dfc) */
unsigned short fc; /* saved fc (sfc, dfc) */
unsigned long crp[2]; /* cpu root pointer */
unsigned long esp0; /* points to SR of stack frame */
unsigned long faddr; /* info about last fault */
@ -92,7 +117,7 @@ struct thread_struct {
#define INIT_THREAD { \
.ksp = sizeof(init_stack) + (unsigned long) init_stack, \
.sr = PS_S, \
.fs = __KERNEL_DS, \
.fc = USER_DATA, \
}
/*

59
arch/m68k/include/asm/segment.h
View File

@ -1,59 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _M68K_SEGMENT_H
#define _M68K_SEGMENT_H
/* define constants */
/* Address spaces (FC0-FC2) */
#define USER_DATA (1)
#ifndef __USER_DS
#define __USER_DS (USER_DATA)
#endif
#define USER_PROGRAM (2)
#define SUPER_DATA (5)
#ifndef __KERNEL_DS
#define __KERNEL_DS (SUPER_DATA)
#endif
#define SUPER_PROGRAM (6)
#define CPU_SPACE (7)
#ifndef __ASSEMBLY__
typedef struct {
unsigned long seg;
} mm_segment_t;
#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES
/*
* Get/set the SFC/DFC registers for MOVES instructions
*/
#define USER_DS MAKE_MM_SEG(__USER_DS)
#define KERNEL_DS MAKE_MM_SEG(__KERNEL_DS)
static inline mm_segment_t get_fs(void)
{
mm_segment_t _v;
__asm__ ("movec %/dfc,%0":"=r" (_v.seg):);
return _v;
}
static inline void set_fs(mm_segment_t val)
{
__asm__ __volatile__ ("movec %0,%/sfc\n\t"
"movec %0,%/dfc\n\t"
: /* no outputs */ : "r" (val.seg) : "memory");
}
#else
#define USER_DS MAKE_MM_SEG(TASK_SIZE)
#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))
#endif
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
#endif /* __ASSEMBLY__ */
#endif /* _M68K_SEGMENT_H */

3
arch/m68k/include/asm/thread_info.h
View File

@ -4,7 +4,6 @@
#include <asm/types.h>
#include <asm/page.h>
#include <asm/segment.h>
/*
* On machines with 4k pages we default to an 8k thread size, though we
@ -27,7 +26,6 @@
struct thread_info {
struct task_struct *task; /* main task structure */
unsigned long flags;
mm_segment_t addr_limit; /* thread address space */
int preempt_count; /* 0 => preemptable, <0 => BUG */
__u32 cpu; /* should always be 0 on m68k */
unsigned long tp_value; /* thread pointer */
@ -37,7 +35,6 @@ struct thread_info {
#define INIT_THREAD_INFO(tsk) \
{ \
.task = &tsk, \
.addr_limit = KERNEL_DS, \
.preempt_count = INIT_PREEMPT_COUNT, \
}

11
arch/m68k/include/asm/tlbflush.h
View File

@ -13,13 +13,12 @@ static inline void flush_tlb_kernel_page(void *addr)
if (CPU_IS_COLDFIRE) {
mmu_write(MMUOR, MMUOR_CNL);
} else if (CPU_IS_040_OR_060) {
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
set_fc(SUPER_DATA);
__asm__ __volatile__(".chip 68040\n\t"
"pflush (%0)\n\t"
".chip 68k"
: : "a" (addr));
set_fs(old_fs);
set_fc(USER_DATA);
} else if (CPU_IS_020_OR_030)
__asm__ __volatile__("pflush #4,#4,(%0)" : : "a" (addr));
}
@ -84,12 +83,8 @@ static inline void flush_tlb_mm(struct mm_struct *mm)
static inline void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
{
if (vma->vm_mm == current->active_mm) {
mm_segment_t old_fs = force_uaccess_begin();
if (vma->vm_mm == current->active_mm)
__flush_tlb_one(addr);
force_uaccess_end(old_fs);
}
}
static inline void flush_tlb_range(struct vm_area_struct *vma,

4
arch/m68k/include/asm/traps.h
View File

@ -267,6 +267,10 @@ struct frame {
} un;
};
#ifdef CONFIG_M68040
asmlinkage void berr_040cleanup(struct frame *fp);
#endif
#endif /* __ASSEMBLY__ */
#endif /* _M68K_TRAPS_H */

215
arch/m68k/include/asm/uaccess.h
View File

@ -9,13 +9,16 @@
*/
#include <linux/compiler.h>
#include <linux/types.h>
#include <asm/segment.h>
#include <asm/extable.h>
/* We let the MMU do all checking */
static inline int access_ok(const void __user *addr,
unsigned long size)
{
/*
* XXX: for !CONFIG_CPU_HAS_ADDRESS_SPACES this really needs to check
* for TASK_SIZE!
*/
return 1;
}
@ -35,12 +38,9 @@ static inline int access_ok(const void __user *addr,
#define MOVES "move"
#endif
extern int __put_user_bad(void);
extern int __get_user_bad(void);
#define __put_user_asm(res, x, ptr, bwl, reg, err) \
#define __put_user_asm(inst, res, x, ptr, bwl, reg, err) \
asm volatile ("\n" \
"1: "MOVES"."#bwl" %2,%1\n" \
"1: "inst"."#bwl" %2,%1\n" \
"2:\n" \
" .section .fixup,\"ax\"\n" \
" .even\n" \
@ -56,6 +56,31 @@ asm volatile ("\n" \
: "+d" (res), "=m" (*(ptr)) \
: #reg (x), "i" (err))
#define __put_user_asm8(inst, res, x, ptr) \
do { \
const void *__pu_ptr = (const void __force *)(ptr); \
\
asm volatile ("\n" \
"1: "inst".l %2,(%1)+\n" \
"2: "inst".l %R2,(%1)\n" \
"3:\n" \
" .section .fixup,\"ax\"\n" \
" .even\n" \
"10: movel %3,%0\n" \
" jra 3b\n" \
" .previous\n" \
"\n" \
" .section __ex_table,\"a\"\n" \
" .align 4\n" \
" .long 1b,10b\n" \
" .long 2b,10b\n" \
" .long 3b,10b\n" \
" .previous" \
: "+d" (res), "+a" (__pu_ptr) \
: "r" (x), "i" (-EFAULT) \
: "memory"); \
} while (0)
/*
* These are the main single-value transfer routines. They automatically
* use the right size if we just have the right pointer type.
@ -68,51 +93,29 @@ asm volatile ("\n" \
__chk_user_ptr(ptr); \
switch (sizeof (*(ptr))) { \
case 1: \
__put_user_asm(__pu_err, __pu_val, ptr, b, d, -EFAULT); \
__put_user_asm(MOVES, __pu_err, __pu_val, ptr, b, d, -EFAULT); \
break; \
case 2: \
__put_user_asm(__pu_err, __pu_val, ptr, w, r, -EFAULT); \
__put_user_asm(MOVES, __pu_err, __pu_val, ptr, w, r, -EFAULT); \
break; \
case 4: \
__put_user_asm(__pu_err, __pu_val, ptr, l, r, -EFAULT); \
__put_user_asm(MOVES, __pu_err, __pu_val, ptr, l, r, -EFAULT); \
break; \
case 8: \
{ \
const void __user *__pu_ptr = (ptr); \
asm volatile ("\n" \
"1: "MOVES".l %2,(%1)+\n" \
"2: "MOVES".l %R2,(%1)\n" \
"3:\n" \
" .section .fixup,\"ax\"\n" \
" .even\n" \
"10: movel %3,%0\n" \
" jra 3b\n" \
" .previous\n" \
"\n" \
" .section __ex_table,\"a\"\n" \
" .align 4\n" \
" .long 1b,10b\n" \
" .long 2b,10b\n" \
" .long 3b,10b\n" \
" .previous" \
: "+d" (__pu_err), "+a" (__pu_ptr) \
: "r" (__pu_val), "i" (-EFAULT) \
: "memory"); \
__put_user_asm8(MOVES, __pu_err, __pu_val, ptr); \
break; \
} \
default: \
__pu_err = __put_user_bad(); \
break; \
BUILD_BUG(); \
} \
__pu_err; \
})
#define put_user(x, ptr) __put_user(x, ptr)
#define __get_user_asm(res, x, ptr, type, bwl, reg, err) ({ \
#define __get_user_asm(inst, res, x, ptr, type, bwl, reg, err) ({ \
type __gu_val; \
asm volatile ("\n" \
"1: "MOVES"."#bwl" %2,%1\n" \
"1: "inst"."#bwl" %2,%1\n" \
"2:\n" \
" .section .fixup,\"ax\"\n" \
" .even\n" \
@ -130,53 +133,57 @@ asm volatile ("\n" \
(x) = (__force typeof(*(ptr)))(__force unsigned long)__gu_val; \
})
#define __get_user_asm8(inst, res, x, ptr) \
do { \
const void *__gu_ptr = (const void __force *)(ptr); \
union { \
u64 l; \
__typeof__(*(ptr)) t; \
} __gu_val; \
\
asm volatile ("\n" \
"1: "inst".l (%2)+,%1\n" \
"2: "inst".l (%2),%R1\n" \
"3:\n" \
" .section .fixup,\"ax\"\n" \
" .even\n" \
"10: move.l %3,%0\n" \
" sub.l %1,%1\n" \
" sub.l %R1,%R1\n" \
" jra 3b\n" \
" .previous\n" \
"\n" \
" .section __ex_table,\"a\"\n" \
" .align 4\n" \
" .long 1b,10b\n" \
" .long 2b,10b\n" \
" .previous" \
: "+d" (res), "=&r" (__gu_val.l), \
"+a" (__gu_ptr) \
: "i" (-EFAULT) \
: "memory"); \
(x) = __gu_val.t; \
} while (0)
#define __get_user(x, ptr) \
({ \
int __gu_err = 0; \
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
case 1: \
__get_user_asm(__gu_err, x, ptr, u8, b, d, -EFAULT); \
__get_user_asm(MOVES, __gu_err, x, ptr, u8, b, d, -EFAULT); \
break; \
case 2: \
__get_user_asm(__gu_err, x, ptr, u16, w, r, -EFAULT); \
__get_user_asm(MOVES, __gu_err, x, ptr, u16, w, r, -EFAULT); \
break; \
case 4: \
__get_user_asm(__gu_err, x, ptr, u32, l, r, -EFAULT); \
__get_user_asm(MOVES, __gu_err, x, ptr, u32, l, r, -EFAULT); \
break; \
case 8: { \
const void __user *__gu_ptr = (ptr); \
union { \
u64 l; \
__typeof__(*(ptr)) t; \
} __gu_val; \
asm volatile ("\n" \
"1: "MOVES".l (%2)+,%1\n" \
"2: "MOVES".l (%2),%R1\n" \
"3:\n" \
" .section .fixup,\"ax\"\n" \
" .even\n" \
"10: move.l %3,%0\n" \
" sub.l %1,%1\n" \
" sub.l %R1,%R1\n" \
" jra 3b\n" \
" .previous\n" \
"\n" \
" .section __ex_table,\"a\"\n" \
" .align 4\n" \
" .long 1b,10b\n" \
" .long 2b,10b\n" \
" .previous" \
: "+d" (__gu_err), "=&r" (__gu_val.l), \
"+a" (__gu_ptr) \
: "i" (-EFAULT) \
: "memory"); \
(x) = __gu_val.t; \
case 8: \
__get_user_asm8(MOVES, __gu_err, x, ptr); \
break; \
} \
default: \
__gu_err = __get_user_bad(); \
break; \
BUILD_BUG(); \
} \
__gu_err; \
})
@ -322,16 +329,19 @@ __constant_copy_to_user(void __user *to, const void *from, unsigned long n)
switch (n) {
case 1:
__put_user_asm(res, *(u8 *)from, (u8 __user *)to, b, d, 1);
__put_user_asm(MOVES, res, *(u8 *)from, (u8 __user *)to,
b, d, 1);
break;
case 2:
__put_user_asm(res, *(u16 *)from, (u16 __user *)to, w, r, 2);
__put_user_asm(MOVES, res, *(u16 *)from, (u16 __user *)to,
w, r, 2);
break;
case 3:
__constant_copy_to_user_asm(res, to, from, tmp, 3, w, b,);
break;
case 4:
__put_user_asm(res, *(u32 *)from, (u32 __user *)to, l, r, 4);
__put_user_asm(MOVES, res, *(u32 *)from, (u32 __user *)to,
l, r, 4);
break;
case 5:
__constant_copy_to_user_asm(res, to, from, tmp, 5, l, b,);
@ -380,8 +390,65 @@ raw_copy_to_user(void __user *to, const void *from, unsigned long n)
#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER
#define user_addr_max() \
(uaccess_kernel() ? ~0UL : TASK_SIZE)
#define HAVE_GET_KERNEL_NOFAULT
#define __get_kernel_nofault(dst, src, type, err_label) \
do { \
type *__gk_dst = (type *)(dst); \
type *__gk_src = (type *)(src); \
int __gk_err = 0; \
\
switch (sizeof(type)) { \
case 1: \
__get_user_asm("move", __gk_err, *__gk_dst, __gk_src, \
u8, b, d, -EFAULT); \
break; \
case 2: \
__get_user_asm("move", __gk_err, *__gk_dst, __gk_src, \
u16, w, r, -EFAULT); \
break; \
case 4: \
__get_user_asm("move", __gk_err, *__gk_dst, __gk_src, \
u32, l, r, -EFAULT); \
break; \
case 8: \
__get_user_asm8("move", __gk_err, *__gk_dst, __gk_src); \
break; \
default: \
BUILD_BUG(); \
} \
if (unlikely(__gk_err)) \
goto err_label; \
} while (0)
#define __put_kernel_nofault(dst, src, type, err_label) \
do { \
type __pk_src = *(type *)(src); \
type *__pk_dst = (type *)(dst); \
int __pk_err = 0; \
\
switch (sizeof(type)) { \
case 1: \
__put_user_asm("move", __pk_err, __pk_src, __pk_dst, \
b, d, -EFAULT); \
break; \
case 2: \
__put_user_asm("move", __pk_err, __pk_src, __pk_dst, \
w, r, -EFAULT); \
break; \
case 4: \
__put_user_asm("move", __pk_err, __pk_src, __pk_dst, \
l, r, -EFAULT); \
break; \
case 8: \
__put_user_asm8("move", __pk_err, __pk_src, __pk_dst); \
break; \
default: \
BUILD_BUG(); \
} \
if (unlikely(__pk_err)) \
goto err_label; \
} while (0)
extern long strncpy_from_user(char *dst, const char __user *src, long count);
extern __must_check long strnlen_user(const char __user *str, long n);

2
arch/m68k/kernel/asm-offsets.c
View File

@ -31,7 +31,7 @@ int main(void)
DEFINE(THREAD_KSP, offsetof(struct thread_struct, ksp));
DEFINE(THREAD_USP, offsetof(struct thread_struct, usp));
DEFINE(THREAD_SR, offsetof(struct thread_struct, sr));
DEFINE(THREAD_FS, offsetof(struct thread_struct, fs));
DEFINE(THREAD_FC, offsetof(struct thread_struct, fc));
DEFINE(THREAD_CRP, offsetof(struct thread_struct, crp));
DEFINE(THREAD_ESP0, offsetof(struct thread_struct, esp0));
DEFINE(THREAD_FPREG, offsetof(struct thread_struct, fp));

58
arch/m68k/kernel/entry.S
View File

@ -36,7 +36,6 @@
#include <linux/linkage.h>
#include <asm/errno.h>
#include <asm/setup.h>
#include <asm/segment.h>
#include <asm/traps.h>
#include <asm/unistd.h>
#include <asm/asm-offsets.h>
@ -78,20 +77,38 @@ ENTRY(__sys_clone3)
ENTRY(sys_sigreturn)
SAVE_SWITCH_STACK
movel %sp,%sp@- | switch_stack pointer
pea %sp@(SWITCH_STACK_SIZE+4) | pt_regs pointer
movel %sp,%a1 | switch_stack pointer
lea %sp@(SWITCH_STACK_SIZE),%a0 | pt_regs pointer
lea %sp@(-84),%sp | leave a gap
movel %a1,%sp@-
movel %a0,%sp@-
jbsr do_sigreturn
addql #8,%sp
RESTORE_SWITCH_STACK
rts
jra 1f | shared with rt_sigreturn()
ENTRY(sys_rt_sigreturn)
SAVE_SWITCH_STACK
movel %sp,%sp@- | switch_stack pointer
pea %sp@(SWITCH_STACK_SIZE+4) | pt_regs pointer
movel %sp,%a1 | switch_stack pointer
lea %sp@(SWITCH_STACK_SIZE),%a0 | pt_regs pointer
lea %sp@(-84),%sp | leave a gap
movel %a1,%sp@-
movel %a0,%sp@-
| stack contents:
| [original pt_regs address] [original switch_stack address]
| [gap] [switch_stack] [pt_regs] [exception frame]
jbsr do_rt_sigreturn
addql #8,%sp
1:
| stack contents now:
| [original pt_regs address] [original switch_stack address]
| [unused part of the gap] [moved switch_stack] [moved pt_regs]
| [replacement exception frame]
| return value of do_{rt_,}sigreturn() points to moved switch_stack.
movel %d0,%sp | discard the leftover junk
RESTORE_SWITCH_STACK
| stack contents now is just [syscall return address] [pt_regs] [frame]
| return pt_regs.d0
movel %sp@(PT_OFF_D0+4),%d0
rts
ENTRY(buserr)
@ -182,25 +199,6 @@ do_trace_exit:
addql #4,%sp
jra .Lret_from_exception
ENTRY(ret_from_signal)
movel %curptr@(TASK_STACK),%a1
tstb %a1@(TINFO_FLAGS+2)
jge 1f
jbsr syscall_trace
1: RESTORE_SWITCH_STACK
addql #4,%sp
/* on 68040 complete pending writebacks if any */
#ifdef CONFIG_M68040
bfextu %sp@(PT_OFF_FORMATVEC){#0,#4},%d0
subql #7,%d0 | bus error frame ?
jbne 1f
movel %sp,%sp@-
jbsr berr_040cleanup
addql #4,%sp
1:
#endif
jra .Lret_from_exception
ENTRY(system_call)
SAVE_ALL_SYS
@ -338,7 +336,7 @@ resume:
/* save fs (sfc,%dfc) (may be pointing to kernel memory) */
movec %sfc,%d0
movew %d0,%a0@(TASK_THREAD+THREAD_FS)
movew %d0,%a0@(TASK_THREAD+THREAD_FC)
/* save usp */
/* it is better to use a movel here instead of a movew 8*) */
@ -424,7 +422,7 @@ resume:
movel %a0,%usp
/* restore fs (sfc,%dfc) */
movew %a1@(TASK_THREAD+THREAD_FS),%a0
movew %a1@(TASK_THREAD+THREAD_FC),%a0
movec %a0,%sfc
movec %a0,%dfc

4
arch/m68k/kernel/process.c
View File

@ -92,7 +92,7 @@ void show_regs(struct pt_regs * regs)
void flush_thread(void)
{
current->thread.fs = __USER_DS;
current->thread.fc = USER_DATA;
#ifdef CONFIG_FPU
if (!FPU_IS_EMU) {
unsigned long zero = 0;
@ -155,7 +155,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long arg,
* Must save the current SFC/DFC value, NOT the value when
* the parent was last descheduled - RGH 10-08-96
*/
p->thread.fs = get_fs().seg;
p->thread.fc = USER_DATA;
if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) {
/* kernel thread */

197
arch/m68k/kernel/signal.c
View File

@ -447,7 +447,7 @@ static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
fpu_version = sc->sc_fpstate[0];
if (CPU_IS_020_OR_030 &&
if (CPU_IS_020_OR_030 && !regs->stkadj &&
regs->vector >= (VEC_FPBRUC * 4) &&
regs->vector <= (VEC_FPNAN * 4)) {
/* Clear pending exception in 68882 idle frame */
@ -510,7 +510,7 @@ static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *
if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
context_size = fpstate[1];
fpu_version = fpstate[0];
if (CPU_IS_020_OR_030 &&
if (CPU_IS_020_OR_030 && !regs->stkadj &&
regs->vector >= (VEC_FPBRUC * 4) &&
regs->vector <= (VEC_FPNAN * 4)) {
/* Clear pending exception in 68882 idle frame */
@ -641,56 +641,35 @@ static inline void siginfo_build_tests(void)
static int mangle_kernel_stack(struct pt_regs *regs, int formatvec,
void __user *fp)
{
int fsize = frame_extra_sizes(formatvec >> 12);
if (fsize < 0) {
int extra = frame_extra_sizes(formatvec >> 12);
char buf[sizeof_field(struct frame, un)];
if (extra < 0) {
/*
* user process trying to return with weird frame format
*/
pr_debug("user process returning with weird frame format\n");
return 1;
return -1;
}
if (!fsize) {
regs->format = formatvec >> 12;
regs->vector = formatvec & 0xfff;
} else {
struct switch_stack *sw = (struct switch_stack *)regs - 1;
/* yes, twice as much as max(sizeof(frame.un.fmt<x>)) */
unsigned long buf[sizeof_field(struct frame, un) / 2];
if (extra && copy_from_user(buf, fp, extra))
return -1;
regs->format = formatvec >> 12;
regs->vector = formatvec & 0xfff;
if (extra) {
void *p = (struct switch_stack *)regs - 1;
struct frame *new = (void *)regs - extra;
int size = sizeof(struct pt_regs)+sizeof(struct switch_stack);
/* that'll make sure that expansion won't crap over data */
if (copy_from_user(buf + fsize / 4, fp, fsize))
return 1;
/* point of no return */
regs->format = formatvec >> 12;
regs->vector = formatvec & 0xfff;
#define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
__asm__ __volatile__ (
#ifdef CONFIG_COLDFIRE
" movel %0,%/sp\n\t"
" bra ret_from_signal\n"
#else
" movel %0,%/a0\n\t"
" subl %1,%/a0\n\t" /* make room on stack */
" movel %/a0,%/sp\n\t" /* set stack pointer */
/* move switch_stack and pt_regs */
"1: movel %0@+,%/a0@+\n\t"
" dbra %2,1b\n\t"
" lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */
" lsrl #2,%1\n\t"
" subql #1,%1\n\t"
/* copy to the gap we'd made */
"2: movel %4@+,%/a0@+\n\t"
" dbra %1,2b\n\t"
" bral ret_from_signal\n"
memmove(p - extra, p, size);
memcpy(p - extra + size, buf, extra);
current->thread.esp0 = (unsigned long)&new->ptregs;
#ifdef CONFIG_M68040
/* on 68040 complete pending writebacks if any */
if (new->ptregs.format == 7) // bus error frame
berr_040cleanup(new);
#endif
: /* no outputs, it doesn't ever return */
: "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
"n" (frame_offset), "a" (buf + fsize/4)
: "a0");
#undef frame_offset
}
return 0;
return extra;
}
static inline int
@ -698,7 +677,6 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __u
{
int formatvec;
struct sigcontext context;
int err = 0;
siginfo_build_tests();
@ -707,7 +685,7 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __u
/* get previous context */
if (copy_from_user(&context, usc, sizeof(context)))
goto badframe;
return -1;
/* restore passed registers */
regs->d0 = context.sc_d0;
@ -720,15 +698,10 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __u
wrusp(context.sc_usp);
formatvec = context.sc_formatvec;
err = restore_fpu_state(&context);
if (restore_fpu_state(&context))
return -1;
if (err || mangle_kernel_stack(regs, formatvec, fp))
goto badframe;
return 0;
badframe:
return 1;
return mangle_kernel_stack(regs, formatvec, fp);
}
static inline int
@ -745,7 +718,7 @@ rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
err = __get_user(temp, &uc->uc_mcontext.version);
if (temp != MCONTEXT_VERSION)
goto badframe;
return -1;
/* restore passed registers */
err |= __get_user(regs->d0, &gregs[0]);
err |= __get_user(regs->d1, &gregs[1]);
@ -774,22 +747,17 @@ rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
err |= restore_altstack(&uc->uc_stack);
if (err)
goto badframe;
return -1;
if (mangle_kernel_stack(regs, temp, &uc->uc_extra))
goto badframe;
return 0;
badframe:
return 1;
return mangle_kernel_stack(regs, temp, &uc->uc_extra);
}
asmlinkage int do_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
asmlinkage void *do_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
{
unsigned long usp = rdusp();
struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
sigset_t set;
int size;
if (!access_ok(frame, sizeof(*frame)))
goto badframe;
@ -801,20 +769,22 @@ asmlinkage int do_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
set_current_blocked(&set);
if (restore_sigcontext(regs, &frame->sc, frame + 1))
size = restore_sigcontext(regs, &frame->sc, frame + 1);
if (size < 0)
goto badframe;
return regs->d0;
return (void *)sw - size;
badframe:
force_sig(SIGSEGV);
return 0;
return sw;
}
asmlinkage int do_rt_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
asmlinkage void *do_rt_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
{
unsigned long usp = rdusp();
struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4);
sigset_t set;
int size;
if (!access_ok(frame, sizeof(*frame)))
goto badframe;
@ -823,27 +793,34 @@ asmlinkage int do_rt_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
set_current_blocked(&set);
if (rt_restore_ucontext(regs, sw, &frame->uc))
size = rt_restore_ucontext(regs, sw, &frame->uc);
if (size < 0)
goto badframe;
return regs->d0;
return (void *)sw - size;
badframe:
force_sig(SIGSEGV);
return 0;
return sw;
}
static inline struct pt_regs *rte_regs(struct pt_regs *regs)
{
return (void *)regs + regs->stkadj;
}
static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
unsigned long mask)
{
struct pt_regs *tregs = rte_regs(regs);
sc->sc_mask = mask;
sc->sc_usp = rdusp();
sc->sc_d0 = regs->d0;
sc->sc_d1 = regs->d1;
sc->sc_a0 = regs->a0;
sc->sc_a1 = regs->a1;
sc->sc_sr = regs->sr;
sc->sc_pc = regs->pc;
sc->sc_formatvec = regs->format << 12 | regs->vector;
sc->sc_sr = tregs->sr;
sc->sc_pc = tregs->pc;
sc->sc_formatvec = tregs->format << 12 | tregs->vector;
save_a5_state(sc, regs);
save_fpu_state(sc, regs);
}
@ -851,6 +828,7 @@ static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs)
{
struct switch_stack *sw = (struct switch_stack *)regs - 1;
struct pt_regs *tregs = rte_regs(regs);
greg_t __user *gregs = uc->uc_mcontext.gregs;
int err = 0;
@ -871,9 +849,9 @@ static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *
err |= __put_user(sw->a5, &gregs[13]);
err |= __put_user(sw->a6, &gregs[14]);
err |= __put_user(rdusp(), &gregs[15]);
err |= __put_user(regs->pc, &gregs[16]);
err |= __put_user(regs->sr, &gregs[17]);
err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec);
err |= __put_user(tregs->pc, &gregs[16]);
err |= __put_user(tregs->sr, &gregs[17]);
err |= __put_user((tregs->format << 12) | tregs->vector, &uc->uc_formatvec);
err |= rt_save_fpu_state(uc, regs);
return err;
}
@ -890,13 +868,14 @@ static int setup_frame(struct ksignal *ksig, sigset_t *set,
struct pt_regs *regs)
{
struct sigframe __user *frame;
int fsize = frame_extra_sizes(regs->format);
struct pt_regs *tregs = rte_regs(regs);
int fsize = frame_extra_sizes(tregs->format);
struct sigcontext context;
int err = 0, sig = ksig->sig;
if (fsize < 0) {
pr_debug("setup_frame: Unknown frame format %#x\n",
regs->format);
tregs->format);
return -EFAULT;
}
@ -907,7 +886,7 @@ static int setup_frame(struct ksignal *ksig, sigset_t *set,
err |= __put_user(sig, &frame->sig);
err |= __put_user(regs->vector, &frame->code);
err |= __put_user(tregs->vector, &frame->code);
err |= __put_user(&frame->sc, &frame->psc);
if (_NSIG_WORDS > 1)
@ -933,34 +912,28 @@ static int setup_frame(struct ksignal *ksig, sigset_t *set,
push_cache ((unsigned long) &frame->retcode);
/*
* Set up registers for signal handler. All the state we are about
* to destroy is successfully copied to sigframe.
*/
wrusp ((unsigned long) frame);
regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
adjustformat(regs);
/*
* This is subtle; if we build more than one sigframe, all but the
* first one will see frame format 0 and have fsize == 0, so we won't
* screw stkadj.
*/
if (fsize)
if (fsize) {
regs->stkadj = fsize;
/* Prepare to skip over the extra stuff in the exception frame. */
if (regs->stkadj) {
struct pt_regs *tregs =
(struct pt_regs *)((ulong)regs + regs->stkadj);
tregs = rte_regs(regs);
pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
/* This must be copied with decreasing addresses to
handle overlaps. */
tregs->vector = 0;
tregs->format = 0;
tregs->pc = regs->pc;
tregs->sr = regs->sr;
}
/*
* Set up registers for signal handler. All the state we are about
* to destroy is successfully copied to sigframe.
*/
wrusp ((unsigned long) frame);
tregs->pc = (unsigned long) ksig->ka.sa.sa_handler;
adjustformat(regs);
return 0;
}
@ -968,7 +941,8 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
struct pt_regs *regs)
{
struct rt_sigframe __user *frame;
int fsize = frame_extra_sizes(regs->format);
struct pt_regs *tregs = rte_regs(regs);
int fsize = frame_extra_sizes(tregs->format);
int err = 0, sig = ksig->sig;
if (fsize < 0) {
@ -1018,34 +992,27 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
push_cache ((unsigned long) &frame->retcode);
/*
* Set up registers for signal handler. All the state we are about
* to destroy is successfully copied to sigframe.
*/
wrusp ((unsigned long) frame);
regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
adjustformat(regs);
/*
* This is subtle; if we build more than one sigframe, all but the
* first one will see frame format 0 and have fsize == 0, so we won't
* screw stkadj.
*/
if (fsize)
if (fsize) {
regs->stkadj = fsize;
/* Prepare to skip over the extra stuff in the exception frame. */
if (regs->stkadj) {
struct pt_regs *tregs =
(struct pt_regs *)((ulong)regs + regs->stkadj);
tregs = rte_regs(regs);
pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
/* This must be copied with decreasing addresses to
handle overlaps. */
tregs->vector = 0;
tregs->format = 0;
tregs->pc = regs->pc;
tregs->sr = regs->sr;
}
/*
* Set up registers for signal handler. All the state we are about
* to destroy is successfully copied to sigframe.
*/
wrusp ((unsigned long) frame);
tregs->pc = (unsigned long) ksig->ka.sa.sa_handler;
adjustformat(regs);
return 0;
}

13
arch/m68k/kernel/traps.c
View File

@ -181,9 +181,8 @@ static inline void access_error060 (struct frame *fp)
static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
{
unsigned long mmusr;
mm_segment_t old_fs = get_fs();
set_fs(MAKE_MM_SEG(wbs));
set_fc(wbs);
if (iswrite)
asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
@ -192,7 +191,7 @@ static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
set_fs(old_fs);
set_fc(USER_DATA);
return mmusr;
}
@ -201,10 +200,8 @@ static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
unsigned long wbd)
{
int res = 0;
mm_segment_t old_fs = get_fs();
/* set_fs can not be moved, otherwise put_user() may oops */
set_fs(MAKE_MM_SEG(wbs));
set_fc(wbs);
switch (wbs & WBSIZ_040) {
case BA_SIZE_BYTE:
@ -218,9 +215,7 @@ static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
break;
}
/* set_fs can not be moved, otherwise put_user() may oops */
set_fs(old_fs);
set_fc(USER_DATA);
pr_debug("do_040writeback1, res=%d\n", res);

1
arch/m68k/mac/misc.c
View File

@ -18,7 +18,6 @@
#include <linux/uaccess.h>
#include <asm/io.h>
#include <asm/segment.h>
#include <asm/setup.h>
#include <asm/macintosh.h>
#include <asm/mac_via.h>

25
arch/m68k/mm/cache.c
View File

@ -49,24 +49,7 @@ static unsigned long virt_to_phys_slow(unsigned long vaddr)
if (mmusr & MMU_R_040)
return (mmusr & PAGE_MASK) | (vaddr & ~PAGE_MASK);
} else {
unsigned short mmusr;
unsigned long *descaddr;
asm volatile ("ptestr %3,%2@,#7,%0\n\t"
"pmove %%psr,%1"
: "=a&" (descaddr), "=m" (mmusr)
: "a" (vaddr), "d" (get_fs().seg));
if (mmusr & (MMU_I|MMU_B|MMU_L))
return 0;
descaddr = phys_to_virt((unsigned long)descaddr);
switch (mmusr & MMU_NUM) {
case 1:
return (*descaddr & 0xfe000000) | (vaddr & 0x01ffffff);
case 2:
return (*descaddr & 0xfffc0000) | (vaddr & 0x0003ffff);
case 3:
return (*descaddr & PAGE_MASK) | (vaddr & ~PAGE_MASK);
}
WARN_ON_ONCE(!CPU_IS_040_OR_060);
}
return 0;
}
@ -107,11 +90,9 @@ void flush_icache_user_range(unsigned long address, unsigned long endaddr)
void flush_icache_range(unsigned long address, unsigned long endaddr)
{
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
set_fc(SUPER_DATA);
flush_icache_user_range(address, endaddr);
set_fs(old_fs);
set_fc(USER_DATA);
}
EXPORT_SYMBOL(flush_icache_range);

6
arch/m68k/mm/init.c
View File

@ -72,12 +72,6 @@ void __init paging_init(void)
if (!empty_zero_page)
panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
__func__, PAGE_SIZE, PAGE_SIZE);
/*
* Set up SFC/DFC registers (user data space).
*/
set_fs (USER_DS);
max_zone_pfn[ZONE_DMA] = end_mem >> PAGE_SHIFT;
free_area_init(max_zone_pfn);
}

1
arch/m68k/mm/kmap.c
View File

@ -17,7 +17,6 @@
#include <linux/vmalloc.h>
#include <asm/setup.h>
#include <asm/segment.h>
#include <asm/page.h>
#include <asm/io.h>
#include <asm/tlbflush.h>

1
arch/m68k/mm/memory.c
View File

@ -15,7 +15,6 @@
#include <linux/gfp.h>
#include <asm/setup.h>
#include <asm/segment.h>
#include <asm/page.h>
#include <asm/traps.h>
#include <asm/machdep.h>

2
arch/m68k/mm/motorola.c
View File

@ -467,7 +467,7 @@ void __init paging_init(void)
/*
* Set up SFC/DFC registers
*/
set_fs(KERNEL_DS);
set_fc(USER_DATA);
#ifdef DEBUG
printk ("before free_area_init\n");

3
arch/m68k/sun3/config.c
View File

@ -31,7 +31,6 @@
#include <asm/intersil.h>
#include <asm/irq.h>
#include <asm/sections.h>
#include <asm/segment.h>
#include <asm/sun3ints.h>
char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
@ -89,7 +88,7 @@ void __init sun3_init(void)
sun3_reserved_pmeg[249] = 1;
sun3_reserved_pmeg[252] = 1;
sun3_reserved_pmeg[253] = 1;
set_fs(KERNEL_DS);
set_fc(USER_DATA);
}
/* Without this, Bad Things happen when something calls arch_reset. */

6
arch/m68k/sun3/mmu_emu.c
View File

@ -23,7 +23,6 @@
#include <linux/uaccess.h>
#include <asm/page.h>
#include <asm/sun3mmu.h>
#include <asm/segment.h>
#include <asm/oplib.h>
#include <asm/mmu_context.h>
#include <asm/dvma.h>
@ -191,14 +190,13 @@ void __init mmu_emu_init(unsigned long bootmem_end)
for(seg = 0; seg < PAGE_OFFSET; seg += SUN3_PMEG_SIZE)
sun3_put_segmap(seg, SUN3_INVALID_PMEG);
set_fs(MAKE_MM_SEG(3));
set_fc(3);
for(seg = 0; seg < 0x10000000; seg += SUN3_PMEG_SIZE) {
i = sun3_get_segmap(seg);
for(j = 1; j < CONTEXTS_NUM; j++)
(*(romvec->pv_setctxt))(j, (void *)seg, i);
}
set_fs(KERNEL_DS);
set_fc(USER_DATA);
}
/* erase the mappings for a dead context. Uses the pg_dir for hints

1
arch/m68k/sun3/sun3ints.c
View File

@ -11,7 +11,6 @@
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <linux/interrupt.h>
#include <asm/segment.h>
#include <asm/intersil.h>
#include <asm/oplib.h>
#include <asm/sun3ints.h>

1
arch/m68k/sun3x/prom.c
View File

@ -14,7 +14,6 @@
#include <asm/traps.h>
#include <asm/sun3xprom.h>
#include <asm/idprom.h>
#include <asm/segment.h>
#include <asm/sun3ints.h>
#include <asm/openprom.h>
#include <asm/machines.h>