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Commit febda3e4 authored by Anton Blanchard's avatar Anton Blanchard
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ppc64: Alignment handler fixes - from Mike Corrigan

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arch/ppc64/kernel/align.c
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/*
* align.c - handle alignment exceptions for the Power PC.
/* align.c - handle alignment exceptions for the Power PC.
*
* Copyright (c) 1996 Paul Mackerras <paulus@cs.anu.edu.au>
* Copyright (c) 1998-1999 TiVo, Inc.
* PowerPC 403GCX modifications.
* Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu>
* PowerPC 403GCX/405GP modifications.
* Copyright (c) 2001 PPC64 team, IBM Corp
* Copyright (c) 2001-2002 PPC64 team, IBM Corp
* 64-bit and Power4 support
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
......@@ -27,10 +27,8 @@ struct aligninfo {
unsigned char flags;
};
#define OPCD(inst) (((inst) & 0xFC000000) >> 26)
#define RS(inst) (((inst) & 0x03E00000) >> 21)
#define RA(inst) (((inst) & 0x001F0000) >> 16)
#define IS_DFORM(code) ((code) >= 32 && (code) <= 47)
#define IS_XFORM(inst) (((inst) >> 26) == 31)
#define IS_DSFORM(inst) (((inst) >> 26) >= 56)
#define INVALID { 0, 0 }
......@@ -40,9 +38,7 @@ struct aligninfo {
#define F 8 /* to/from fp regs */
#define U 0x10 /* update index register */
#define M 0x20 /* multiple load/store */
#define S 0x40 /* single-precision fp, or byte-swap value */
#define HARD 0x80 /* string, stwcx. */
#define D 0x100 /* double-word load/store */
#define SW 0x40 /* byte swap */
#define DCBZ 0x5f /* 8xx/82xx dcbz faults when cache not enabled */
......@@ -61,9 +57,9 @@ static struct aligninfo aligninfo[128] = {
{ 2, LD+SE }, /* 00 0 0101: lha */
{ 2, ST }, /* 00 0 0110: sth */
{ 4, LD+M }, /* 00 0 0111: lmw */
{ 4, LD+F+S }, /* 00 0 1000: lfs */
{ 4, LD+F }, /* 00 0 1000: lfs */
{ 8, LD+F }, /* 00 0 1001: lfd */
{ 4, ST+F+S }, /* 00 0 1010: stfs */
{ 4, ST+F }, /* 00 0 1010: stfs */
{ 8, ST+F }, /* 00 0 1011: stfd */
INVALID, /* 00 0 1100 */
{ 8, LD }, /* 00 0 1101: ld */
......@@ -77,12 +73,12 @@ static struct aligninfo aligninfo[128] = {
{ 2, LD+SE+U }, /* 00 1 0101: lhau */
{ 2, ST+U }, /* 00 1 0110: sthu */
{ 4, ST+M }, /* 00 1 0111: stmw */
{ 4, LD+F+S+U }, /* 00 1 1000: lfsu */
{ 4, LD+F+U }, /* 00 1 1000: lfsu */
{ 8, LD+F+U }, /* 00 1 1001: lfdu */
{ 4, ST+F+S+U }, /* 00 1 1010: stfsu */
{ 4, ST+F+U }, /* 00 1 1010: stfsu */
{ 8, ST+F+U }, /* 00 1 1011: stfdu */
INVALID, /* 00 1 1100 */
{ 8, ST }, /* 00 1 1101: std */
INVALID, /* 00 1 1101 */
INVALID, /* 00 1 1110 */
INVALID, /* 00 1 1111 */
{ 8, LD }, /* 01 0 0000: ldx */
......@@ -90,13 +86,13 @@ static struct aligninfo aligninfo[128] = {
{ 8, ST }, /* 01 0 0010: stdx */
INVALID, /* 01 0 0011 */
INVALID, /* 01 0 0100 */
INVALID, /* 01 0 0101: lwax?? */
{ 4, LD+SE }, /* 01 0 0101: lwax */
INVALID, /* 01 0 0110 */
INVALID, /* 01 0 0111 */
{ 0, LD+HARD }, /* 01 0 1000: lswx */
{ 0, LD+HARD }, /* 01 0 1001: lswi */
{ 0, ST+HARD }, /* 01 0 1010: stswx */
{ 0, ST+HARD }, /* 01 0 1011: stswi */
{ 0, LD }, /* 01 0 1000: lswx */
{ 0, LD }, /* 01 0 1001: lswi */
{ 0, ST }, /* 01 0 1010: stswx */
{ 0, ST }, /* 01 0 1011: stswi */
INVALID, /* 01 0 1100 */
{ 8, LD+U }, /* 01 0 1101: ldu */
INVALID, /* 01 0 1110 */
......@@ -106,7 +102,7 @@ static struct aligninfo aligninfo[128] = {
{ 8, ST+U }, /* 01 1 0010: stdux */
INVALID, /* 01 1 0011 */
INVALID, /* 01 1 0100 */
INVALID, /* 01 1 0101: lwaux?? */
{ 4, LD+SE+U }, /* 01 1 0101: lwaux */
INVALID, /* 01 1 0110 */
INVALID, /* 01 1 0111 */
INVALID, /* 01 1 1000 */
......@@ -119,19 +115,19 @@ static struct aligninfo aligninfo[128] = {
INVALID, /* 01 1 1111 */
INVALID, /* 10 0 0000 */
INVALID, /* 10 0 0001 */
{ 0, ST+HARD }, /* 10 0 0010: stwcx. */
{ 0, ST }, /* 10 0 0010: stwcx. */
INVALID, /* 10 0 0011 */
INVALID, /* 10 0 0100 */
INVALID, /* 10 0 0101 */
INVALID, /* 10 0 0110 */
INVALID, /* 10 0 0111 */
{ 4, LD+S }, /* 10 0 1000: lwbrx */
{ 4, LD+SW }, /* 10 0 1000: lwbrx */
INVALID, /* 10 0 1001 */
{ 4, ST+S }, /* 10 0 1010: stwbrx */
{ 4, ST+SW }, /* 10 0 1010: stwbrx */
INVALID, /* 10 0 1011 */
{ 2, LD+S }, /* 10 0 1100: lhbrx */
INVALID, /* 10 0 1101 */
{ 2, ST+S }, /* 10 0 1110: sthbrx */
{ 2, LD+SW }, /* 10 0 1100: lhbrx */
{ 4, LD+SE }, /* 10 0 1101 lwa */
{ 2, ST+SW }, /* 10 0 1110: sthbrx */
INVALID, /* 10 0 1111 */
INVALID, /* 10 1 0000 */
INVALID, /* 10 1 0001 */
......@@ -148,7 +144,7 @@ static struct aligninfo aligninfo[128] = {
INVALID, /* 10 1 1100 */
INVALID, /* 10 1 1101 */
INVALID, /* 10 1 1110 */
{ 0, ST+HARD }, /* 10 1 1111: dcbz */
{ L1_CACHE_BYTES, ST }, /* 10 1 1111: dcbz */
{ 4, LD }, /* 11 0 0000: lwzx */
INVALID, /* 11 0 0001 */
{ 4, ST }, /* 11 0 0010: stwx */
......@@ -157,14 +153,14 @@ static struct aligninfo aligninfo[128] = {
{ 2, LD+SE }, /* 11 0 0101: lhax */
{ 2, ST }, /* 11 0 0110: sthx */
INVALID, /* 11 0 0111 */
{ 4, LD+F+S }, /* 11 0 1000: lfsx */
{ 4, LD+F }, /* 11 0 1000: lfsx */
{ 8, LD+F }, /* 11 0 1001: lfdx */
{ 4, ST+F+S }, /* 11 0 1010: stfsx */
{ 4, ST+F }, /* 11 0 1010: stfsx */
{ 8, ST+F }, /* 11 0 1011: stfdx */
INVALID, /* 11 0 1100 */
INVALID, /* 11 0 1101 */
{ 8, LD+M }, /* 11 0 1101: lmd */
INVALID, /* 11 0 1110 */
INVALID, /* 11 0 1111 */
{ 8, ST+M }, /* 11 0 1111: stmd */
{ 4, LD+U }, /* 11 1 0000: lwzux */
INVALID, /* 11 1 0001 */
{ 4, ST+U }, /* 11 1 0010: stwux */
......@@ -173,9 +169,9 @@ static struct aligninfo aligninfo[128] = {
{ 2, LD+SE+U }, /* 11 1 0101: lhaux */
{ 2, ST+U }, /* 11 1 0110: sthux */
INVALID, /* 11 1 0111 */
{ 4, LD+F+S+U }, /* 11 1 1000: lfsux */
{ 4, LD+F+U }, /* 11 1 1000: lfsux */
{ 8, LD+F+U }, /* 11 1 1001: lfdux */
{ 4, ST+F+S+U }, /* 11 1 1010: stfsux */
{ 4, ST+F+U }, /* 11 1 1010: stfsux */
{ 8, ST+F+U }, /* 11 1 1011: stfdux */
INVALID, /* 11 1 1100 */
INVALID, /* 11 1 1101 */
......@@ -185,178 +181,203 @@ static struct aligninfo aligninfo[128] = {
#define SWAP(a, b) (t = (a), (a) = (b), (b) = t)
unsigned static inline make_dsisr( unsigned instr )
{
unsigned dsisr;
/* create a DSISR value from the instruction */
dsisr = (instr & 0x03ff0000) >> 16; /* bits 6:15 --> 22:31 */
if ( IS_XFORM(instr) ) {
dsisr |= (instr & 0x00000006) << 14; /* bits 29:30 --> 15:16 */
dsisr |= (instr & 0x00000040) << 8; /* bit 25 --> 17 */
dsisr |= (instr & 0x00000780) << 3; /* bits 21:24 --> 18:21 */
}
else {
dsisr |= (instr & 0x04000000) >> 12; /* bit 5 --> 17 */
dsisr |= (instr & 0x78000000) >> 17; /* bits 1: 4 --> 18:21 */
if ( IS_DSFORM(instr) ) {
dsisr |= (instr & 0x00000003) << 18; /* bits 30:31 --> 12:13 */
}
}
return dsisr;
}
int
fix_alignment(struct pt_regs *regs)
{
int instr, nb, flags;
int opcode, f1, f2, f3;
int i, t;
int reg, areg;
unsigned char *addr;
unsigned int instr, nb, flags;
int t;
unsigned long reg, areg;
unsigned long i;
int ret;
unsigned dsisr;
unsigned char *addr, *p;
unsigned long *lp;
union {
int l;
long ll;
float f;
double d;
double dd;
unsigned char v[8];
struct {
unsigned hi32;
int low32;
} x32;
struct {
unsigned char hi48[6];
short low16;
} x16;
} data;
if (__is_processor(PV_POWER4)) {
/*
* The POWER4 has a DSISR register but doesn't set it on
* an alignment fault. -- paulus
*/
/*
* Return 1 on success
* Return 0 if unable to handle the interrupt
* Return -EFAULT if data address is bad
*/
instr = *((unsigned int *)regs->nip);
opcode = OPCD(instr);
reg = RS(instr);
areg = RA(instr);
dsisr = regs->dsisr;
if (IS_DFORM(opcode)) {
f1 = 0;
f2 = (instr & 0x04000000) >> 26;
f3 = (instr & 0x78000000) >> 27;
} else {
f1 = (instr & 0x00000006) >> 1;
f2 = (instr & 0x00000040) >> 6;
f3 = (instr & 0x00000780) >> 7;
}
/* Power4 doesn't set DSISR for an alignment interrupt */
if (__is_processor(PV_POWER4))
dsisr = make_dsisr( *((unsigned *)regs->nip) );
instr = ((f1 << 5) | (f2 << 4) | f3);
} else {
reg = (regs->dsisr >> 5) & 0x1f; /* source/dest register */
areg = regs->dsisr & 0x1f; /* register to update */
instr = (regs->dsisr >> 10) & 0x7f;
instr |= (regs->dsisr >> 13) & 0x60;
}
/* extract the operation and registers from the dsisr */
reg = (dsisr >> 5) & 0x1f; /* source/dest register */
areg = dsisr & 0x1f; /* register to update */
instr = (dsisr >> 10) & 0x7f;
instr |= (dsisr >> 13) & 0x60;
/* Lookup the operation in our table */
nb = aligninfo[instr].len;
if (nb == 0) {
long *p;
int i;
if (instr != DCBZ)
return 0; /* too hard or invalid instruction */
/*
* The dcbz (data cache block zero) instruction
* gives an alignment fault if used on non-cacheable
* memory. We handle the fault mainly for the
* case when we are running with the cache disabled
* for debugging.
*/
p = (long *) (regs->dar & -L1_CACHE_BYTES);
for (i = 0; i < L1_CACHE_BYTES / sizeof(long); ++i)
p[i] = 0;
return 1;
}
flags = aligninfo[instr].flags;
/* DAR has the operand effective address */
addr = (unsigned char *)regs->dar;
/* A size of 0 indicates an instruction we don't support */
/* we also don't support the multiples (lmw, stmw, lmd, stmd) */
if ((nb == 0) || (flags & M))
return 0; /* too hard or invalid instruction */
/*
* Special handling for dcbz
* dcbz may give an alignment exception for accesses to caching inhibited
* storage
*/
if (instr == DCBZ)
addr = (unsigned char *) ((unsigned long)addr & -L1_CACHE_BYTES);
/* Verify the address of the operand */
if (user_mode(regs)) {
if (verify_area((flags & ST? VERIFY_WRITE: VERIFY_READ), addr, nb))
return -EFAULT; /* bad address */
}
/* Force the fprs into the save area so we can reference them */
if ((flags & F) && (regs->msr & MSR_FP))
giveup_fpu(current);
if (flags & M)
return 0; /* too hard for now */
/* If we read the operand, copy it in */
/* If we are loading, get the data from user space */
if (flags & LD) {
if (nb == 2) {
data.v[0] = data.v[1] = 0;
if (__get_user(data.v[2], addr)
|| __get_user(data.v[3], addr+1))
data.ll = 0;
ret = 0;
p = addr;
switch (nb) {
case 8:
ret |= __get_user(data.v[0], p++);
ret |= __get_user(data.v[1], p++);
ret |= __get_user(data.v[2], p++);
ret |= __get_user(data.v[3], p++);
case 4:
ret |= __get_user(data.v[4], p++);
ret |= __get_user(data.v[5], p++);
case 2:
ret |= __get_user(data.v[6], p++);
ret |= __get_user(data.v[7], p++);
if (ret)
return -EFAULT;
} else {
for (i = 0; i < nb; ++i)
if (__get_user(data.v[i], addr+i))
return -EFAULT;
}
}
/* Unfortunately D (== 0x100) doesn't fit in the aligninfo[n].flags
field. So synthesize it here. */
if ((flags & F) == 0 && nb == 8)
flags |= D;
switch (flags & ~U) {
case LD+SE:
if (data.v[2] >= 0x80)
data.v[0] = data.v[1] = -1;
/* fall through */
case LD:
regs->gpr[reg] = data.l;
break;
case LD+D:
regs->gpr[reg] = data.ll;
break;
case LD+S:
if (nb == 2) {
SWAP(data.v[2], data.v[3]);
} else {
SWAP(data.v[0], data.v[3]);
SWAP(data.v[1], data.v[2]);
/* If we are storing, get the data from the saved gpr or fpr */
if (flags & ST) {
if (flags & F) {
if (nb == 4) {
/* Doing stfs, have to convert to single */
enable_kernel_fp();
cvt_df(&current->thread.fpr[reg], (float *)&data.v[4], &current->thread.fpscr);
}
else
data.dd = current->thread.fpr[reg];
}
regs->gpr[reg] = data.l;
break;
case ST:
data.l = regs->gpr[reg];
break;
case ST+D:
data.ll = regs->gpr[reg];
break;
case ST+S:
data.l = regs->gpr[reg];
if (nb == 2) {
SWAP(data.v[2], data.v[3]);
} else {
SWAP(data.v[0], data.v[3]);
SWAP(data.v[1], data.v[2]);
else
data.ll = regs->gpr[reg];
}
/* Swap bytes as needed */
if (flags & SW) {
if (nb == 2)
SWAP(data.v[6], data.v[7]);
else { /* nb must be 4 */
SWAP(data.v[4], data.v[7]);
SWAP(data.v[5], data.v[6]);
}
break;
case LD+F:
current->thread.fpr[reg] = data.d;
break;
case ST+F:
data.d = current->thread.fpr[reg];
break;
/* these require some floating point conversions... */
/* we'd like to use the assignment, but we have to compile
* the kernel with -msoft-float so it doesn't use the
* fp regs for copying 8-byte objects. */
case LD+F+S:
enable_kernel_fp();
cvt_fd(&data.f, &current->thread.fpr[reg], &current->thread.fpscr);
/* current->thread.fpr[reg] = data.f; */
break;
case ST+F+S:
enable_kernel_fp();
cvt_df(&current->thread.fpr[reg], &data.f, &current->thread.fpscr);
/* data.f = current->thread.fpr[reg]; */
break;
default:
printk("align: can't handle flags=%x\n", flags);
return 0;
}
/* Sign extend as needed */
if (flags & SE) {
if ( nb == 2 )
data.ll = data.x16.low16;
else /* nb must be 4 */
data.ll = data.x32.low32;
}
/* If we are loading, move the data to the gpr or fpr */
if (flags & LD) {
if (flags & F) {
if (nb == 4) {
/* Doing lfs, have to convert to double */
enable_kernel_fp();
cvt_fd((float *)&data.v[4], &current->thread.fpr[reg], &current->thread.fpscr);
}
else
current->thread.fpr[reg] = data.dd;
}
else
regs->gpr[reg] = data.ll;
}
/* If we are storing, copy the data to the user */
if (flags & ST) {
if (nb == 2) {
if (__put_user(data.v[2], addr)
|| __put_user(data.v[3], addr+1))
return -EFAULT;
} else {
for (i = 0; i < nb; ++i)
if (__put_user(data.v[i], addr+i))
return -EFAULT;
ret = 0;
p = addr;
switch (nb) {
case 128: /* Special case - must be dcbz */
lp = (unsigned long *)p;
for (i = 0; i < L1_CACHE_BYTES / sizeof(long); ++i)
ret |= __put_user(0, lp++);
break;
case 8:
ret |= __put_user(data.v[0], p++);
ret |= __put_user(data.v[1], p++);
ret |= __put_user(data.v[2], p++);
ret |= __put_user(data.v[3], p++);
case 4:
ret |= __put_user(data.v[4], p++);
ret |= __put_user(data.v[5], p++);
case 2:
ret |= __put_user(data.v[6], p++);
ret |= __put_user(data.v[7], p++);
}
if (ret)
return -EFAULT;
}
/* Update RA as needed */
if (flags & U) {
regs->gpr[areg] = regs->dar;
}
return 1;
}
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