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linux/arch/sh/kernel/traps_64.c
Paul Gortmaker 4603f53a1d sh: delete __cpuinit usage from all sh files 
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications.  For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.

After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out.  Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.

Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
are flagged as __cpuinit  -- so if we remove the __cpuinit from
arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
content into no-ops as early as possible, since that will get rid
of these warnings.  In any case, they are temporary and harmless.

This removes all the arch/sh uses of the __cpuinit macros from
all C files.  Currently sh does not have any __CPUINIT used in
assembly files.

[1] https://lkml.org/lkml/2013/5/20/589

Cc: Paul Mundt <lethal@linux-sh.org>
Cc: linux-sh@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-07-14 19:36:53 -04:00

817 lines
21 KiB
C
Raw Blame History

/*
* arch/sh/kernel/traps_64.c
*
* Copyright (C) 2000, 2001 Paolo Alberelli
* Copyright (C) 2003, 2004 Paul Mundt
* Copyright (C) 2003, 2004 Richard Curnow
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/kallsyms.h>
#include <linux/interrupt.h>
#include <linux/sysctl.h>
#include <linux/module.h>
#include <linux/perf_event.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/alignment.h>
#include <asm/processor.h>
#include <asm/pgtable.h>
#include <asm/fpu.h>
static int read_opcode(reg_size_t pc, insn_size_t *result_opcode, int from_user_mode)
{
int get_user_error;
unsigned long aligned_pc;
insn_size_t opcode;
if ((pc & 3) == 1) {
/* SHmedia */
aligned_pc = pc & ~3;
if (from_user_mode) {
if (!access_ok(VERIFY_READ, aligned_pc, sizeof(insn_size_t))) {
get_user_error = -EFAULT;
} else {
get_user_error = __get_user(opcode, (insn_size_t *)aligned_pc);
*result_opcode = opcode;
}
return get_user_error;
} else {
/* If the fault was in the kernel, we can either read
* this directly, or if not, we fault.
*/
*result_opcode = *(insn_size_t *)aligned_pc;
return 0;
}
} else if ((pc & 1) == 0) {
/* SHcompact */
/* TODO : provide handling for this. We don't really support
user-mode SHcompact yet, and for a kernel fault, this would
have to come from a module built for SHcompact. */
return -EFAULT;
} else {
/* misaligned */
return -EFAULT;
}
}
static int address_is_sign_extended(__u64 a)
{
__u64 b;
#if (NEFF == 32)
b = (__u64)(__s64)(__s32)(a & 0xffffffffUL);
return (b == a) ? 1 : 0;
#else
#error "Sign extend check only works for NEFF==32"
#endif
}
/* return -1 for fault, 0 for OK */
static int generate_and_check_address(struct pt_regs *regs,
insn_size_t opcode,
int displacement_not_indexed,
int width_shift,
__u64 *address)
{
__u64 base_address, addr;
int basereg;
switch (1 << width_shift) {
case 1: inc_unaligned_byte_access(); break;
case 2: inc_unaligned_word_access(); break;
case 4: inc_unaligned_dword_access(); break;
case 8: inc_unaligned_multi_access(); break;
}
basereg = (opcode >> 20) & 0x3f;
base_address = regs->regs[basereg];
if (displacement_not_indexed) {
__s64 displacement;
displacement = (opcode >> 10) & 0x3ff;
displacement = ((displacement << 54) >> 54); /* sign extend */
addr = (__u64)((__s64)base_address + (displacement << width_shift));
} else {
__u64 offset;
int offsetreg;
offsetreg = (opcode >> 10) & 0x3f;
offset = regs->regs[offsetreg];
addr = base_address + offset;
}
/* Check sign extended */
if (!address_is_sign_extended(addr))
return -1;
/* Check accessible. For misaligned access in the kernel, assume the
address is always accessible (and if not, just fault when the
load/store gets done.) */
if (user_mode(regs)) {
inc_unaligned_user_access();
if (addr >= TASK_SIZE)
return -1;
} else
inc_unaligned_kernel_access();
*address = addr;
perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, addr);
unaligned_fixups_notify(current, opcode, regs);
return 0;
}
static void misaligned_kernel_word_load(__u64 address, int do_sign_extend, __u64 *result)
{
unsigned short x;
unsigned char *p, *q;
p = (unsigned char *) (int) address;
q = (unsigned char *) &x;
q[0] = p[0];
q[1] = p[1];
if (do_sign_extend) {
*result = (__u64)(__s64) *(short *) &x;
} else {
*result = (__u64) x;
}
}
static void misaligned_kernel_word_store(__u64 address, __u64 value)
{
unsigned short x;
unsigned char *p, *q;
p = (unsigned char *) (int) address;
q = (unsigned char *) &x;
x = (__u16) value;
p[0] = q[0];
p[1] = q[1];
}
static int misaligned_load(struct pt_regs *regs,
insn_size_t opcode,
int displacement_not_indexed,
int width_shift,
int do_sign_extend)
{
/* Return -1 for a fault, 0 for OK */
int error;
int destreg;
__u64 address;
error = generate_and_check_address(regs, opcode,
displacement_not_indexed, width_shift, &address);
if (error < 0)
return error;
destreg = (opcode >> 4) & 0x3f;
if (user_mode(regs)) {
__u64 buffer;
if (!access_ok(VERIFY_READ, (unsigned long) address, 1UL<<width_shift)) {
return -1;
}
if (__copy_user(&buffer, (const void *)(int)address, (1 << width_shift)) > 0) {
return -1; /* fault */
}
switch (width_shift) {
case 1:
if (do_sign_extend) {
regs->regs[destreg] = (__u64)(__s64) *(__s16 *) &buffer;
} else {
regs->regs[destreg] = (__u64) *(__u16 *) &buffer;
}
break;
case 2:
regs->regs[destreg] = (__u64)(__s64) *(__s32 *) &buffer;
break;
case 3:
regs->regs[destreg] = buffer;
break;
default:
printk("Unexpected width_shift %d in misaligned_load, PC=%08lx\n",
width_shift, (unsigned long) regs->pc);
break;
}
} else {
/* kernel mode - we can take short cuts since if we fault, it's a genuine bug */
__u64 lo, hi;
switch (width_shift) {
case 1:
misaligned_kernel_word_load(address, do_sign_extend, &regs->regs[destreg]);
break;
case 2:
asm ("ldlo.l %1, 0, %0" : "=r" (lo) : "r" (address));
asm ("ldhi.l %1, 3, %0" : "=r" (hi) : "r" (address));
regs->regs[destreg] = lo | hi;
break;
case 3:
asm ("ldlo.q %1, 0, %0" : "=r" (lo) : "r" (address));
asm ("ldhi.q %1, 7, %0" : "=r" (hi) : "r" (address));
regs->regs[destreg] = lo | hi;
break;
default:
printk("Unexpected width_shift %d in misaligned_load, PC=%08lx\n",
width_shift, (unsigned long) regs->pc);
break;
}
}
return 0;
}
static int misaligned_store(struct pt_regs *regs,
insn_size_t opcode,
int displacement_not_indexed,
int width_shift)
{
/* Return -1 for a fault, 0 for OK */
int error;
int srcreg;
__u64 address;
error = generate_and_check_address(regs, opcode,
displacement_not_indexed, width_shift, &address);
if (error < 0)
return error;
srcreg = (opcode >> 4) & 0x3f;
if (user_mode(regs)) {
__u64 buffer;
if (!access_ok(VERIFY_WRITE, (unsigned long) address, 1UL<<width_shift)) {
return -1;
}
switch (width_shift) {
case 1:
*(__u16 *) &buffer = (__u16) regs->regs[srcreg];
break;
case 2:
*(__u32 *) &buffer = (__u32) regs->regs[srcreg];
break;
case 3:
buffer = regs->regs[srcreg];
break;
default:
printk("Unexpected width_shift %d in misaligned_store, PC=%08lx\n",
width_shift, (unsigned long) regs->pc);
break;
}
if (__copy_user((void *)(int)address, &buffer, (1 << width_shift)) > 0) {
return -1; /* fault */
}
} else {
/* kernel mode - we can take short cuts since if we fault, it's a genuine bug */
__u64 val = regs->regs[srcreg];
switch (width_shift) {
case 1:
misaligned_kernel_word_store(address, val);
break;
case 2:
asm ("stlo.l %1, 0, %0" : : "r" (val), "r" (address));
asm ("sthi.l %1, 3, %0" : : "r" (val), "r" (address));
break;
case 3:
asm ("stlo.q %1, 0, %0" : : "r" (val), "r" (address));
asm ("sthi.q %1, 7, %0" : : "r" (val), "r" (address));
break;
default:
printk("Unexpected width_shift %d in misaligned_store, PC=%08lx\n",
width_shift, (unsigned long) regs->pc);
break;
}
}
return 0;
}
/* Never need to fix up misaligned FPU accesses within the kernel since that's a real
error. */
static int misaligned_fpu_load(struct pt_regs *regs,
insn_size_t opcode,
int displacement_not_indexed,
int width_shift,
int do_paired_load)
{
/* Return -1 for a fault, 0 for OK */
int error;
int destreg;
__u64 address;
error = generate_and_check_address(regs, opcode,
displacement_not_indexed, width_shift, &address);
if (error < 0)
return error;
destreg = (opcode >> 4) & 0x3f;
if (user_mode(regs)) {
__u64 buffer;
__u32 buflo, bufhi;
if (!access_ok(VERIFY_READ, (unsigned long) address, 1UL<<width_shift)) {
return -1;
}
if (__copy_user(&buffer, (const void *)(int)address, (1 << width_shift)) > 0) {
return -1; /* fault */
}
/* 'current' may be the current owner of the FPU state, so
context switch the registers into memory so they can be
indexed by register number. */
if (last_task_used_math == current) {
enable_fpu();
save_fpu(current);
disable_fpu();
last_task_used_math = NULL;
regs->sr |= SR_FD;
}
buflo = *(__u32*) &buffer;
bufhi = *(1 + (__u32*) &buffer);
switch (width_shift) {
case 2:
current->thread.xstate->hardfpu.fp_regs[destreg] = buflo;
break;
case 3:
if (do_paired_load) {
current->thread.xstate->hardfpu.fp_regs[destreg] = buflo;
current->thread.xstate->hardfpu.fp_regs[destreg+1] = bufhi;
} else {
#if defined(CONFIG_CPU_LITTLE_ENDIAN)
current->thread.xstate->hardfpu.fp_regs[destreg] = bufhi;
current->thread.xstate->hardfpu.fp_regs[destreg+1] = buflo;
#else
current->thread.xstate->hardfpu.fp_regs[destreg] = buflo;
current->thread.xstate->hardfpu.fp_regs[destreg+1] = bufhi;
#endif
}
break;
default:
printk("Unexpected width_shift %d in misaligned_fpu_load, PC=%08lx\n",
width_shift, (unsigned long) regs->pc);
break;
}
return 0;
} else {
die ("Misaligned FPU load inside kernel", regs, 0);
return -1;
}
}
static int misaligned_fpu_store(struct pt_regs *regs,
insn_size_t opcode,
int displacement_not_indexed,
int width_shift,
int do_paired_load)
{
/* Return -1 for a fault, 0 for OK */
int error;
int srcreg;
__u64 address;
error = generate_and_check_address(regs, opcode,
displacement_not_indexed, width_shift, &address);
if (error < 0)
return error;
srcreg = (opcode >> 4) & 0x3f;
if (user_mode(regs)) {
__u64 buffer;
/* Initialise these to NaNs. */
__u32 buflo=0xffffffffUL, bufhi=0xffffffffUL;
if (!access_ok(VERIFY_WRITE, (unsigned long) address, 1UL<<width_shift)) {
return -1;
}
/* 'current' may be the current owner of the FPU state, so
context switch the registers into memory so they can be
indexed by register number. */
if (last_task_used_math == current) {
enable_fpu();
save_fpu(current);
disable_fpu();
last_task_used_math = NULL;
regs->sr |= SR_FD;
}
switch (width_shift) {
case 2:
buflo = current->thread.xstate->hardfpu.fp_regs[srcreg];
break;
case 3:
if (do_paired_load) {
buflo = current->thread.xstate->hardfpu.fp_regs[srcreg];
bufhi = current->thread.xstate->hardfpu.fp_regs[srcreg+1];
} else {
#if defined(CONFIG_CPU_LITTLE_ENDIAN)
bufhi = current->thread.xstate->hardfpu.fp_regs[srcreg];
buflo = current->thread.xstate->hardfpu.fp_regs[srcreg+1];
#else
buflo = current->thread.xstate->hardfpu.fp_regs[srcreg];
bufhi = current->thread.xstate->hardfpu.fp_regs[srcreg+1];
#endif
}
break;
default:
printk("Unexpected width_shift %d in misaligned_fpu_store, PC=%08lx\n",
width_shift, (unsigned long) regs->pc);
break;
}
*(__u32*) &buffer = buflo;
*(1 + (__u32*) &buffer) = bufhi;
if (__copy_user((void *)(int)address, &buffer, (1 << width_shift)) > 0) {
return -1; /* fault */
}
return 0;
} else {
die ("Misaligned FPU load inside kernel", regs, 0);
return -1;
}
}
static int misaligned_fixup(struct pt_regs *regs)
{
insn_size_t opcode;
int error;
int major, minor;
unsigned int user_action;
user_action = unaligned_user_action();
if (!(user_action & UM_FIXUP))
return -1;
error = read_opcode(regs->pc, &opcode, user_mode(regs));
if (error < 0) {
return error;
}
major = (opcode >> 26) & 0x3f;
minor = (opcode >> 16) & 0xf;
switch (major) {
case (0x84>>2): /* LD.W */
error = misaligned_load(regs, opcode, 1, 1, 1);
break;
case (0xb0>>2): /* LD.UW */
error = misaligned_load(regs, opcode, 1, 1, 0);
break;
case (0x88>>2): /* LD.L */
error = misaligned_load(regs, opcode, 1, 2, 1);
break;
case (0x8c>>2): /* LD.Q */
error = misaligned_load(regs, opcode, 1, 3, 0);
break;
case (0xa4>>2): /* ST.W */
error = misaligned_store(regs, opcode, 1, 1);
break;
case (0xa8>>2): /* ST.L */
error = misaligned_store(regs, opcode, 1, 2);
break;
case (0xac>>2): /* ST.Q */
error = misaligned_store(regs, opcode, 1, 3);
break;
case (0x40>>2): /* indexed loads */
switch (minor) {
case 0x1: /* LDX.W */
error = misaligned_load(regs, opcode, 0, 1, 1);
break;
case 0x5: /* LDX.UW */
error = misaligned_load(regs, opcode, 0, 1, 0);
break;
case 0x2: /* LDX.L */
error = misaligned_load(regs, opcode, 0, 2, 1);
break;
case 0x3: /* LDX.Q */
error = misaligned_load(regs, opcode, 0, 3, 0);
break;
default:
error = -1;
break;
}
break;
case (0x60>>2): /* indexed stores */
switch (minor) {
case 0x1: /* STX.W */
error = misaligned_store(regs, opcode, 0, 1);
break;
case 0x2: /* STX.L */
error = misaligned_store(regs, opcode, 0, 2);
break;
case 0x3: /* STX.Q */
error = misaligned_store(regs, opcode, 0, 3);
break;
default:
error = -1;
break;
}
break;
case (0x94>>2): /* FLD.S */
error = misaligned_fpu_load(regs, opcode, 1, 2, 0);
break;
case (0x98>>2): /* FLD.P */
error = misaligned_fpu_load(regs, opcode, 1, 3, 1);
break;
case (0x9c>>2): /* FLD.D */
error = misaligned_fpu_load(regs, opcode, 1, 3, 0);
break;
case (0x1c>>2): /* floating indexed loads */
switch (minor) {
case 0x8: /* FLDX.S */
error = misaligned_fpu_load(regs, opcode, 0, 2, 0);
break;
case 0xd: /* FLDX.P */
error = misaligned_fpu_load(regs, opcode, 0, 3, 1);
break;
case 0x9: /* FLDX.D */
error = misaligned_fpu_load(regs, opcode, 0, 3, 0);
break;
default:
error = -1;
break;
}
break;
case (0xb4>>2): /* FLD.S */
error = misaligned_fpu_store(regs, opcode, 1, 2, 0);
break;
case (0xb8>>2): /* FLD.P */
error = misaligned_fpu_store(regs, opcode, 1, 3, 1);
break;
case (0xbc>>2): /* FLD.D */
error = misaligned_fpu_store(regs, opcode, 1, 3, 0);
break;
case (0x3c>>2): /* floating indexed stores */
switch (minor) {
case 0x8: /* FSTX.S */
error = misaligned_fpu_store(regs, opcode, 0, 2, 0);
break;
case 0xd: /* FSTX.P */
error = misaligned_fpu_store(regs, opcode, 0, 3, 1);
break;
case 0x9: /* FSTX.D */
error = misaligned_fpu_store(regs, opcode, 0, 3, 0);
break;
default:
error = -1;
break;
}
break;
default:
/* Fault */
error = -1;
break;
}
if (error < 0) {
return error;
} else {
regs->pc += 4; /* Skip the instruction that's just been emulated */
return 0;
}
}
static void do_unhandled_exception(int signr, char *str, unsigned long error,
struct pt_regs *regs)
{
if (user_mode(regs))
force_sig(signr, current);
die_if_no_fixup(str, regs, error);
}
#define DO_ERROR(signr, str, name) \
asmlinkage void do_##name(unsigned long error_code, struct pt_regs *regs) \
{ \
do_unhandled_exception(signr, str, error_code, regs); \
}
DO_ERROR(SIGILL, "illegal slot instruction", illegal_slot_inst)
DO_ERROR(SIGSEGV, "address error (exec)", address_error_exec)
#if defined(CONFIG_SH64_ID2815_WORKAROUND)
#define OPCODE_INVALID 0
#define OPCODE_USER_VALID 1
#define OPCODE_PRIV_VALID 2
/* getcon/putcon - requires checking which control register is referenced. */
#define OPCODE_CTRL_REG 3
/* Table of valid opcodes for SHmedia mode.
Form a 10-bit value by concatenating the major/minor opcodes i.e.
opcode[31:26,20:16]. The 6 MSBs of this value index into the following
array. The 4 LSBs select the bit-pair in the entry (bits 1:0 correspond to
LSBs==4'b0000 etc). */
static unsigned long shmedia_opcode_table[64] = {
0x55554044,0x54445055,0x15141514,0x14541414,0x00000000,0x10001000,0x01110055,0x04050015,
0x00000444,0xc0000000,0x44545515,0x40405555,0x55550015,0x10005555,0x55555505,0x04050000,
0x00000555,0x00000404,0x00040445,0x15151414,0x00000000,0x00000000,0x00000000,0x00000000,
0x00000055,0x40404444,0x00000404,0xc0009495,0x00000000,0x00000000,0x00000000,0x00000000,
0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,
0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,
0x80005050,0x04005055,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,
0x81055554,0x00000404,0x55555555,0x55555555,0x00000000,0x00000000,0x00000000,0x00000000
};
/* Workaround SH5-101 cut2 silicon defect #2815 :
in some situations, inter-mode branches from SHcompact -> SHmedia
which should take ITLBMISS or EXECPROT exceptions at the target
falsely take RESINST at the target instead. */
void do_reserved_inst(unsigned long error_code, struct pt_regs *regs)
{
insn_size_t opcode = 0x6ff4fff0; /* guaranteed reserved opcode */
unsigned long pc, aligned_pc;
unsigned long index, shift;
unsigned long major, minor, combined;
unsigned long reserved_field;
int opcode_state;
int get_user_error;
int signr = SIGILL;
char *exception_name = "reserved_instruction";
pc = regs->pc;
/* SHcompact is not handled */
if (unlikely((pc & 3) == 0))
goto out;
/* SHmedia : check for defect. This requires executable vmas
to be readable too. */
aligned_pc = pc & ~3;
if (!access_ok(VERIFY_READ, aligned_pc, sizeof(insn_size_t)))
get_user_error = -EFAULT;
else
get_user_error = __get_user(opcode, (insn_size_t *)aligned_pc);
if (get_user_error < 0) {
/*
* Error trying to read opcode. This typically means a
* real fault, not a RESINST any more. So change the
* codes.
*/
exception_name = "address error (exec)";
signr = SIGSEGV;
goto out;
}
/* These bits are currently reserved as zero in all valid opcodes */
reserved_field = opcode & 0xf;
if (unlikely(reserved_field))
goto out; /* invalid opcode */
major = (opcode >> 26) & 0x3f;
minor = (opcode >> 16) & 0xf;
combined = (major << 4) | minor;
index = major;
shift = minor << 1;
opcode_state = (shmedia_opcode_table[index] >> shift) & 0x3;
switch (opcode_state) {
case OPCODE_INVALID:
/* Trap. */
break;
case OPCODE_USER_VALID:
/*
* Restart the instruction: the branch to the instruction
* will now be from an RTE not from SHcompact so the
* silicon defect won't be triggered.
*/
return;
case OPCODE_PRIV_VALID:
if (!user_mode(regs)) {
/*
* Should only ever get here if a module has
* SHcompact code inside it. If so, the same fix
* up is needed.
*/
return; /* same reason */
}
/*
* Otherwise, user mode trying to execute a privileged
* instruction - fall through to trap.
*/
break;
case OPCODE_CTRL_REG:
/* If in privileged mode, return as above. */
if (!user_mode(regs))
return;
/* In user mode ... */
if (combined == 0x9f) { /* GETCON */
unsigned long regno = (opcode >> 20) & 0x3f;
if (regno >= 62)
return;
/* reserved/privileged control register => trap */
} else if (combined == 0x1bf) { /* PUTCON */
unsigned long regno = (opcode >> 4) & 0x3f;
if (regno >= 62)
return;
/* reserved/privileged control register => trap */
}
break;
default:
/* Fall through to trap. */
break;
}
out:
do_unhandled_exception(signr, exception_name, error_code, regs);
}
#else /* CONFIG_SH64_ID2815_WORKAROUND */
/* If the workaround isn't needed, this is just a straightforward reserved
instruction */
DO_ERROR(SIGILL, "reserved instruction", reserved_inst)
#endif /* CONFIG_SH64_ID2815_WORKAROUND */
/* Called with interrupts disabled */
asmlinkage void do_exception_error(unsigned long ex, struct pt_regs *regs)
{
die_if_kernel("exception", regs, ex);
}
asmlinkage int do_unknown_trapa(unsigned long scId, struct pt_regs *regs)
{
/* Syscall debug */
printk("System call ID error: [0x1#args:8 #syscall:16 0x%lx]\n", scId);
die_if_kernel("unknown trapa", regs, scId);
return -ENOSYS;
}
/* Implement misaligned load/store handling for kernel (and optionally for user
mode too). Limitation : only SHmedia mode code is handled - there is no
handling at all for misaligned accesses occurring in SHcompact code yet. */
asmlinkage void do_address_error_load(unsigned long error_code, struct pt_regs *regs)
{
if (misaligned_fixup(regs) < 0)
do_unhandled_exception(SIGSEGV, "address error(load)",
error_code, regs);
}
asmlinkage void do_address_error_store(unsigned long error_code, struct pt_regs *regs)
{
if (misaligned_fixup(regs) < 0)
do_unhandled_exception(SIGSEGV, "address error(store)",
error_code, regs);
}
asmlinkage void do_debug_interrupt(unsigned long code, struct pt_regs *regs)
{
u64 peek_real_address_q(u64 addr);
u64 poke_real_address_q(u64 addr, u64 val);
unsigned long long DM_EXP_CAUSE_PHY = 0x0c100010;
unsigned long long exp_cause;
/* It's not worth ioremapping the debug module registers for the amount
of access we make to them - just go direct to their physical
addresses. */
exp_cause = peek_real_address_q(DM_EXP_CAUSE_PHY);
if (exp_cause & ~4)
printk("DM.EXP_CAUSE had unexpected bits set (=%08lx)\n",
(unsigned long)(exp_cause & 0xffffffff));
show_state();
/* Clear all DEBUGINT causes */
poke_real_address_q(DM_EXP_CAUSE_PHY, 0x0);
}
void per_cpu_trap_init(void)
{
/* Nothing to do for now, VBR initialization later. */
}
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