678 lines
17 KiB
C
678 lines
17 KiB
C
/*
|
|
* unaligned.c: Unaligned load/store trap handling with special
|
|
* cases for the kernel to do them more quickly.
|
|
*
|
|
* Copyright (C) 1996,2008 David S. Miller (davem@davemloft.net)
|
|
* Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
|
|
*/
|
|
|
|
|
|
#include <linux/jiffies.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/module.h>
|
|
#include <asm/asi.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/pstate.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/uaccess.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/perf_event.h>
|
|
#include <linux/ratelimit.h>
|
|
#include <linux/bitops.h>
|
|
#include <asm/fpumacro.h>
|
|
#include <asm/cacheflush.h>
|
|
|
|
enum direction {
|
|
load, /* ld, ldd, ldh, ldsh */
|
|
store, /* st, std, sth, stsh */
|
|
both, /* Swap, ldstub, cas, ... */
|
|
fpld,
|
|
fpst,
|
|
invalid,
|
|
};
|
|
|
|
static inline enum direction decode_direction(unsigned int insn)
|
|
{
|
|
unsigned long tmp = (insn >> 21) & 1;
|
|
|
|
if (!tmp)
|
|
return load;
|
|
else {
|
|
switch ((insn>>19)&0xf) {
|
|
case 15: /* swap* */
|
|
return both;
|
|
default:
|
|
return store;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* 16 = double-word, 8 = extra-word, 4 = word, 2 = half-word */
|
|
static inline int decode_access_size(struct pt_regs *regs, unsigned int insn)
|
|
{
|
|
unsigned int tmp;
|
|
|
|
tmp = ((insn >> 19) & 0xf);
|
|
if (tmp == 11 || tmp == 14) /* ldx/stx */
|
|
return 8;
|
|
tmp &= 3;
|
|
if (!tmp)
|
|
return 4;
|
|
else if (tmp == 3)
|
|
return 16; /* ldd/std - Although it is actually 8 */
|
|
else if (tmp == 2)
|
|
return 2;
|
|
else {
|
|
printk("Impossible unaligned trap. insn=%08x\n", insn);
|
|
die_if_kernel("Byte sized unaligned access?!?!", regs);
|
|
|
|
/* GCC should never warn that control reaches the end
|
|
* of this function without returning a value because
|
|
* die_if_kernel() is marked with attribute 'noreturn'.
|
|
* Alas, some versions do...
|
|
*/
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static inline int decode_asi(unsigned int insn, struct pt_regs *regs)
|
|
{
|
|
if (insn & 0x800000) {
|
|
if (insn & 0x2000)
|
|
return (unsigned char)(regs->tstate >> 24); /* %asi */
|
|
else
|
|
return (unsigned char)(insn >> 5); /* imm_asi */
|
|
} else
|
|
return ASI_P;
|
|
}
|
|
|
|
/* 0x400000 = signed, 0 = unsigned */
|
|
static inline int decode_signedness(unsigned int insn)
|
|
{
|
|
return (insn & 0x400000);
|
|
}
|
|
|
|
static inline void maybe_flush_windows(unsigned int rs1, unsigned int rs2,
|
|
unsigned int rd, int from_kernel)
|
|
{
|
|
if (rs2 >= 16 || rs1 >= 16 || rd >= 16) {
|
|
if (from_kernel != 0)
|
|
__asm__ __volatile__("flushw");
|
|
else
|
|
flushw_user();
|
|
}
|
|
}
|
|
|
|
static inline long sign_extend_imm13(long imm)
|
|
{
|
|
return imm << 51 >> 51;
|
|
}
|
|
|
|
static unsigned long fetch_reg(unsigned int reg, struct pt_regs *regs)
|
|
{
|
|
unsigned long value;
|
|
|
|
if (reg < 16)
|
|
return (!reg ? 0 : regs->u_regs[reg]);
|
|
if (regs->tstate & TSTATE_PRIV) {
|
|
struct reg_window *win;
|
|
win = (struct reg_window *)(regs->u_regs[UREG_FP] + STACK_BIAS);
|
|
value = win->locals[reg - 16];
|
|
} else if (test_thread_flag(TIF_32BIT)) {
|
|
struct reg_window32 __user *win32;
|
|
win32 = (struct reg_window32 __user *)((unsigned long)((u32)regs->u_regs[UREG_FP]));
|
|
get_user(value, &win32->locals[reg - 16]);
|
|
} else {
|
|
struct reg_window __user *win;
|
|
win = (struct reg_window __user *)(regs->u_regs[UREG_FP] + STACK_BIAS);
|
|
get_user(value, &win->locals[reg - 16]);
|
|
}
|
|
return value;
|
|
}
|
|
|
|
static unsigned long *fetch_reg_addr(unsigned int reg, struct pt_regs *regs)
|
|
{
|
|
if (reg < 16)
|
|
return ®s->u_regs[reg];
|
|
if (regs->tstate & TSTATE_PRIV) {
|
|
struct reg_window *win;
|
|
win = (struct reg_window *)(regs->u_regs[UREG_FP] + STACK_BIAS);
|
|
return &win->locals[reg - 16];
|
|
} else if (test_thread_flag(TIF_32BIT)) {
|
|
struct reg_window32 *win32;
|
|
win32 = (struct reg_window32 *)((unsigned long)((u32)regs->u_regs[UREG_FP]));
|
|
return (unsigned long *)&win32->locals[reg - 16];
|
|
} else {
|
|
struct reg_window *win;
|
|
win = (struct reg_window *)(regs->u_regs[UREG_FP] + STACK_BIAS);
|
|
return &win->locals[reg - 16];
|
|
}
|
|
}
|
|
|
|
unsigned long compute_effective_address(struct pt_regs *regs,
|
|
unsigned int insn, unsigned int rd)
|
|
{
|
|
unsigned int rs1 = (insn >> 14) & 0x1f;
|
|
unsigned int rs2 = insn & 0x1f;
|
|
int from_kernel = (regs->tstate & TSTATE_PRIV) != 0;
|
|
|
|
if (insn & 0x2000) {
|
|
maybe_flush_windows(rs1, 0, rd, from_kernel);
|
|
return (fetch_reg(rs1, regs) + sign_extend_imm13(insn));
|
|
} else {
|
|
maybe_flush_windows(rs1, rs2, rd, from_kernel);
|
|
return (fetch_reg(rs1, regs) + fetch_reg(rs2, regs));
|
|
}
|
|
}
|
|
|
|
/* This is just to make gcc think die_if_kernel does return... */
|
|
static void __used unaligned_panic(char *str, struct pt_regs *regs)
|
|
{
|
|
die_if_kernel(str, regs);
|
|
}
|
|
|
|
extern int do_int_load(unsigned long *dest_reg, int size,
|
|
unsigned long *saddr, int is_signed, int asi);
|
|
|
|
extern int __do_int_store(unsigned long *dst_addr, int size,
|
|
unsigned long src_val, int asi);
|
|
|
|
static inline int do_int_store(int reg_num, int size, unsigned long *dst_addr,
|
|
struct pt_regs *regs, int asi, int orig_asi)
|
|
{
|
|
unsigned long zero = 0;
|
|
unsigned long *src_val_p = &zero;
|
|
unsigned long src_val;
|
|
|
|
if (size == 16) {
|
|
size = 8;
|
|
zero = (((long)(reg_num ?
|
|
(unsigned)fetch_reg(reg_num, regs) : 0)) << 32) |
|
|
(unsigned)fetch_reg(reg_num + 1, regs);
|
|
} else if (reg_num) {
|
|
src_val_p = fetch_reg_addr(reg_num, regs);
|
|
}
|
|
src_val = *src_val_p;
|
|
if (unlikely(asi != orig_asi)) {
|
|
switch (size) {
|
|
case 2:
|
|
src_val = swab16(src_val);
|
|
break;
|
|
case 4:
|
|
src_val = swab32(src_val);
|
|
break;
|
|
case 8:
|
|
src_val = swab64(src_val);
|
|
break;
|
|
case 16:
|
|
default:
|
|
BUG();
|
|
break;
|
|
}
|
|
}
|
|
return __do_int_store(dst_addr, size, src_val, asi);
|
|
}
|
|
|
|
static inline void advance(struct pt_regs *regs)
|
|
{
|
|
regs->tpc = regs->tnpc;
|
|
regs->tnpc += 4;
|
|
if (test_thread_flag(TIF_32BIT)) {
|
|
regs->tpc &= 0xffffffff;
|
|
regs->tnpc &= 0xffffffff;
|
|
}
|
|
}
|
|
|
|
static inline int floating_point_load_or_store_p(unsigned int insn)
|
|
{
|
|
return (insn >> 24) & 1;
|
|
}
|
|
|
|
static inline int ok_for_kernel(unsigned int insn)
|
|
{
|
|
return !floating_point_load_or_store_p(insn);
|
|
}
|
|
|
|
static void kernel_mna_trap_fault(int fixup_tstate_asi)
|
|
{
|
|
struct pt_regs *regs = current_thread_info()->kern_una_regs;
|
|
unsigned int insn = current_thread_info()->kern_una_insn;
|
|
const struct exception_table_entry *entry;
|
|
|
|
entry = search_exception_tables(regs->tpc);
|
|
if (!entry) {
|
|
unsigned long address;
|
|
|
|
address = compute_effective_address(regs, insn,
|
|
((insn >> 25) & 0x1f));
|
|
if (address < PAGE_SIZE) {
|
|
printk(KERN_ALERT "Unable to handle kernel NULL "
|
|
"pointer dereference in mna handler");
|
|
} else
|
|
printk(KERN_ALERT "Unable to handle kernel paging "
|
|
"request in mna handler");
|
|
printk(KERN_ALERT " at virtual address %016lx\n",address);
|
|
printk(KERN_ALERT "current->{active_,}mm->context = %016lx\n",
|
|
(current->mm ? CTX_HWBITS(current->mm->context) :
|
|
CTX_HWBITS(current->active_mm->context)));
|
|
printk(KERN_ALERT "current->{active_,}mm->pgd = %016lx\n",
|
|
(current->mm ? (unsigned long) current->mm->pgd :
|
|
(unsigned long) current->active_mm->pgd));
|
|
die_if_kernel("Oops", regs);
|
|
/* Not reached */
|
|
}
|
|
regs->tpc = entry->fixup;
|
|
regs->tnpc = regs->tpc + 4;
|
|
|
|
if (fixup_tstate_asi) {
|
|
regs->tstate &= ~TSTATE_ASI;
|
|
regs->tstate |= (ASI_AIUS << 24UL);
|
|
}
|
|
}
|
|
|
|
static void log_unaligned(struct pt_regs *regs)
|
|
{
|
|
static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5);
|
|
|
|
if (__ratelimit(&ratelimit)) {
|
|
printk("Kernel unaligned access at TPC[%lx] %pS\n",
|
|
regs->tpc, (void *) regs->tpc);
|
|
}
|
|
}
|
|
|
|
asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn)
|
|
{
|
|
enum direction dir = decode_direction(insn);
|
|
int size = decode_access_size(regs, insn);
|
|
int orig_asi, asi;
|
|
|
|
current_thread_info()->kern_una_regs = regs;
|
|
current_thread_info()->kern_una_insn = insn;
|
|
|
|
orig_asi = asi = decode_asi(insn, regs);
|
|
|
|
/* If this is a {get,put}_user() on an unaligned userspace pointer,
|
|
* just signal a fault and do not log the event.
|
|
*/
|
|
if (asi == ASI_AIUS) {
|
|
kernel_mna_trap_fault(0);
|
|
return;
|
|
}
|
|
|
|
log_unaligned(regs);
|
|
|
|
if (!ok_for_kernel(insn) || dir == both) {
|
|
printk("Unsupported unaligned load/store trap for kernel "
|
|
"at <%016lx>.\n", regs->tpc);
|
|
unaligned_panic("Kernel does fpu/atomic "
|
|
"unaligned load/store.", regs);
|
|
|
|
kernel_mna_trap_fault(0);
|
|
} else {
|
|
unsigned long addr, *reg_addr;
|
|
int err;
|
|
|
|
addr = compute_effective_address(regs, insn,
|
|
((insn >> 25) & 0x1f));
|
|
perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, addr);
|
|
switch (asi) {
|
|
case ASI_NL:
|
|
case ASI_AIUPL:
|
|
case ASI_AIUSL:
|
|
case ASI_PL:
|
|
case ASI_SL:
|
|
case ASI_PNFL:
|
|
case ASI_SNFL:
|
|
asi &= ~0x08;
|
|
break;
|
|
}
|
|
switch (dir) {
|
|
case load:
|
|
reg_addr = fetch_reg_addr(((insn>>25)&0x1f), regs);
|
|
err = do_int_load(reg_addr, size,
|
|
(unsigned long *) addr,
|
|
decode_signedness(insn), asi);
|
|
if (likely(!err) && unlikely(asi != orig_asi)) {
|
|
unsigned long val_in = *reg_addr;
|
|
switch (size) {
|
|
case 2:
|
|
val_in = swab16(val_in);
|
|
break;
|
|
case 4:
|
|
val_in = swab32(val_in);
|
|
break;
|
|
case 8:
|
|
val_in = swab64(val_in);
|
|
break;
|
|
case 16:
|
|
default:
|
|
BUG();
|
|
break;
|
|
}
|
|
*reg_addr = val_in;
|
|
}
|
|
break;
|
|
|
|
case store:
|
|
err = do_int_store(((insn>>25)&0x1f), size,
|
|
(unsigned long *) addr, regs,
|
|
asi, orig_asi);
|
|
break;
|
|
|
|
default:
|
|
panic("Impossible kernel unaligned trap.");
|
|
/* Not reached... */
|
|
}
|
|
if (unlikely(err))
|
|
kernel_mna_trap_fault(1);
|
|
else
|
|
advance(regs);
|
|
}
|
|
}
|
|
|
|
int handle_popc(u32 insn, struct pt_regs *regs)
|
|
{
|
|
int from_kernel = (regs->tstate & TSTATE_PRIV) != 0;
|
|
int ret, rd = ((insn >> 25) & 0x1f);
|
|
u64 value;
|
|
|
|
perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, 0);
|
|
if (insn & 0x2000) {
|
|
maybe_flush_windows(0, 0, rd, from_kernel);
|
|
value = sign_extend_imm13(insn);
|
|
} else {
|
|
maybe_flush_windows(0, insn & 0x1f, rd, from_kernel);
|
|
value = fetch_reg(insn & 0x1f, regs);
|
|
}
|
|
ret = hweight64(value);
|
|
if (rd < 16) {
|
|
if (rd)
|
|
regs->u_regs[rd] = ret;
|
|
} else {
|
|
if (test_thread_flag(TIF_32BIT)) {
|
|
struct reg_window32 __user *win32;
|
|
win32 = (struct reg_window32 __user *)((unsigned long)((u32)regs->u_regs[UREG_FP]));
|
|
put_user(ret, &win32->locals[rd - 16]);
|
|
} else {
|
|
struct reg_window __user *win;
|
|
win = (struct reg_window __user *)(regs->u_regs[UREG_FP] + STACK_BIAS);
|
|
put_user(ret, &win->locals[rd - 16]);
|
|
}
|
|
}
|
|
advance(regs);
|
|
return 1;
|
|
}
|
|
|
|
extern void do_fpother(struct pt_regs *regs);
|
|
extern void do_privact(struct pt_regs *regs);
|
|
extern void spitfire_data_access_exception(struct pt_regs *regs,
|
|
unsigned long sfsr,
|
|
unsigned long sfar);
|
|
extern void sun4v_data_access_exception(struct pt_regs *regs,
|
|
unsigned long addr,
|
|
unsigned long type_ctx);
|
|
|
|
int handle_ldf_stq(u32 insn, struct pt_regs *regs)
|
|
{
|
|
unsigned long addr = compute_effective_address(regs, insn, 0);
|
|
int freg = ((insn >> 25) & 0x1e) | ((insn >> 20) & 0x20);
|
|
struct fpustate *f = FPUSTATE;
|
|
int asi = decode_asi(insn, regs);
|
|
int flag = (freg < 32) ? FPRS_DL : FPRS_DU;
|
|
|
|
perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, 0);
|
|
|
|
save_and_clear_fpu();
|
|
current_thread_info()->xfsr[0] &= ~0x1c000;
|
|
if (freg & 3) {
|
|
current_thread_info()->xfsr[0] |= (6 << 14) /* invalid_fp_register */;
|
|
do_fpother(regs);
|
|
return 0;
|
|
}
|
|
if (insn & 0x200000) {
|
|
/* STQ */
|
|
u64 first = 0, second = 0;
|
|
|
|
if (current_thread_info()->fpsaved[0] & flag) {
|
|
first = *(u64 *)&f->regs[freg];
|
|
second = *(u64 *)&f->regs[freg+2];
|
|
}
|
|
if (asi < 0x80) {
|
|
do_privact(regs);
|
|
return 1;
|
|
}
|
|
switch (asi) {
|
|
case ASI_P:
|
|
case ASI_S: break;
|
|
case ASI_PL:
|
|
case ASI_SL:
|
|
{
|
|
/* Need to convert endians */
|
|
u64 tmp = __swab64p(&first);
|
|
|
|
first = __swab64p(&second);
|
|
second = tmp;
|
|
break;
|
|
}
|
|
default:
|
|
if (tlb_type == hypervisor)
|
|
sun4v_data_access_exception(regs, addr, 0);
|
|
else
|
|
spitfire_data_access_exception(regs, 0, addr);
|
|
return 1;
|
|
}
|
|
if (put_user (first >> 32, (u32 __user *)addr) ||
|
|
__put_user ((u32)first, (u32 __user *)(addr + 4)) ||
|
|
__put_user (second >> 32, (u32 __user *)(addr + 8)) ||
|
|
__put_user ((u32)second, (u32 __user *)(addr + 12))) {
|
|
if (tlb_type == hypervisor)
|
|
sun4v_data_access_exception(regs, addr, 0);
|
|
else
|
|
spitfire_data_access_exception(regs, 0, addr);
|
|
return 1;
|
|
}
|
|
} else {
|
|
/* LDF, LDDF, LDQF */
|
|
u32 data[4] __attribute__ ((aligned(8)));
|
|
int size, i;
|
|
int err;
|
|
|
|
if (asi < 0x80) {
|
|
do_privact(regs);
|
|
return 1;
|
|
} else if (asi > ASI_SNFL) {
|
|
if (tlb_type == hypervisor)
|
|
sun4v_data_access_exception(regs, addr, 0);
|
|
else
|
|
spitfire_data_access_exception(regs, 0, addr);
|
|
return 1;
|
|
}
|
|
switch (insn & 0x180000) {
|
|
case 0x000000: size = 1; break;
|
|
case 0x100000: size = 4; break;
|
|
default: size = 2; break;
|
|
}
|
|
for (i = 0; i < size; i++)
|
|
data[i] = 0;
|
|
|
|
err = get_user (data[0], (u32 __user *) addr);
|
|
if (!err) {
|
|
for (i = 1; i < size; i++)
|
|
err |= __get_user (data[i], (u32 __user *)(addr + 4*i));
|
|
}
|
|
if (err && !(asi & 0x2 /* NF */)) {
|
|
if (tlb_type == hypervisor)
|
|
sun4v_data_access_exception(regs, addr, 0);
|
|
else
|
|
spitfire_data_access_exception(regs, 0, addr);
|
|
return 1;
|
|
}
|
|
if (asi & 0x8) /* Little */ {
|
|
u64 tmp;
|
|
|
|
switch (size) {
|
|
case 1: data[0] = le32_to_cpup(data + 0); break;
|
|
default:*(u64 *)(data + 0) = le64_to_cpup((u64 *)(data + 0));
|
|
break;
|
|
case 4: tmp = le64_to_cpup((u64 *)(data + 0));
|
|
*(u64 *)(data + 0) = le64_to_cpup((u64 *)(data + 2));
|
|
*(u64 *)(data + 2) = tmp;
|
|
break;
|
|
}
|
|
}
|
|
if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) {
|
|
current_thread_info()->fpsaved[0] = FPRS_FEF;
|
|
current_thread_info()->gsr[0] = 0;
|
|
}
|
|
if (!(current_thread_info()->fpsaved[0] & flag)) {
|
|
if (freg < 32)
|
|
memset(f->regs, 0, 32*sizeof(u32));
|
|
else
|
|
memset(f->regs+32, 0, 32*sizeof(u32));
|
|
}
|
|
memcpy(f->regs + freg, data, size * 4);
|
|
current_thread_info()->fpsaved[0] |= flag;
|
|
}
|
|
advance(regs);
|
|
return 1;
|
|
}
|
|
|
|
void handle_ld_nf(u32 insn, struct pt_regs *regs)
|
|
{
|
|
int rd = ((insn >> 25) & 0x1f);
|
|
int from_kernel = (regs->tstate & TSTATE_PRIV) != 0;
|
|
unsigned long *reg;
|
|
|
|
perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, 0);
|
|
|
|
maybe_flush_windows(0, 0, rd, from_kernel);
|
|
reg = fetch_reg_addr(rd, regs);
|
|
if (from_kernel || rd < 16) {
|
|
reg[0] = 0;
|
|
if ((insn & 0x780000) == 0x180000)
|
|
reg[1] = 0;
|
|
} else if (test_thread_flag(TIF_32BIT)) {
|
|
put_user(0, (int __user *) reg);
|
|
if ((insn & 0x780000) == 0x180000)
|
|
put_user(0, ((int __user *) reg) + 1);
|
|
} else {
|
|
put_user(0, (unsigned long __user *) reg);
|
|
if ((insn & 0x780000) == 0x180000)
|
|
put_user(0, (unsigned long __user *) reg + 1);
|
|
}
|
|
advance(regs);
|
|
}
|
|
|
|
void handle_lddfmna(struct pt_regs *regs, unsigned long sfar, unsigned long sfsr)
|
|
{
|
|
unsigned long pc = regs->tpc;
|
|
unsigned long tstate = regs->tstate;
|
|
u32 insn;
|
|
u64 value;
|
|
u8 freg;
|
|
int flag;
|
|
struct fpustate *f = FPUSTATE;
|
|
|
|
if (tstate & TSTATE_PRIV)
|
|
die_if_kernel("lddfmna from kernel", regs);
|
|
perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, sfar);
|
|
if (test_thread_flag(TIF_32BIT))
|
|
pc = (u32)pc;
|
|
if (get_user(insn, (u32 __user *) pc) != -EFAULT) {
|
|
int asi = decode_asi(insn, regs);
|
|
u32 first, second;
|
|
int err;
|
|
|
|
if ((asi > ASI_SNFL) ||
|
|
(asi < ASI_P))
|
|
goto daex;
|
|
first = second = 0;
|
|
err = get_user(first, (u32 __user *)sfar);
|
|
if (!err)
|
|
err = get_user(second, (u32 __user *)(sfar + 4));
|
|
if (err) {
|
|
if (!(asi & 0x2))
|
|
goto daex;
|
|
first = second = 0;
|
|
}
|
|
save_and_clear_fpu();
|
|
freg = ((insn >> 25) & 0x1e) | ((insn >> 20) & 0x20);
|
|
value = (((u64)first) << 32) | second;
|
|
if (asi & 0x8) /* Little */
|
|
value = __swab64p(&value);
|
|
flag = (freg < 32) ? FPRS_DL : FPRS_DU;
|
|
if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) {
|
|
current_thread_info()->fpsaved[0] = FPRS_FEF;
|
|
current_thread_info()->gsr[0] = 0;
|
|
}
|
|
if (!(current_thread_info()->fpsaved[0] & flag)) {
|
|
if (freg < 32)
|
|
memset(f->regs, 0, 32*sizeof(u32));
|
|
else
|
|
memset(f->regs+32, 0, 32*sizeof(u32));
|
|
}
|
|
*(u64 *)(f->regs + freg) = value;
|
|
current_thread_info()->fpsaved[0] |= flag;
|
|
} else {
|
|
daex:
|
|
if (tlb_type == hypervisor)
|
|
sun4v_data_access_exception(regs, sfar, sfsr);
|
|
else
|
|
spitfire_data_access_exception(regs, sfsr, sfar);
|
|
return;
|
|
}
|
|
advance(regs);
|
|
}
|
|
|
|
void handle_stdfmna(struct pt_regs *regs, unsigned long sfar, unsigned long sfsr)
|
|
{
|
|
unsigned long pc = regs->tpc;
|
|
unsigned long tstate = regs->tstate;
|
|
u32 insn;
|
|
u64 value;
|
|
u8 freg;
|
|
int flag;
|
|
struct fpustate *f = FPUSTATE;
|
|
|
|
if (tstate & TSTATE_PRIV)
|
|
die_if_kernel("stdfmna from kernel", regs);
|
|
perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, sfar);
|
|
if (test_thread_flag(TIF_32BIT))
|
|
pc = (u32)pc;
|
|
if (get_user(insn, (u32 __user *) pc) != -EFAULT) {
|
|
int asi = decode_asi(insn, regs);
|
|
freg = ((insn >> 25) & 0x1e) | ((insn >> 20) & 0x20);
|
|
value = 0;
|
|
flag = (freg < 32) ? FPRS_DL : FPRS_DU;
|
|
if ((asi > ASI_SNFL) ||
|
|
(asi < ASI_P))
|
|
goto daex;
|
|
save_and_clear_fpu();
|
|
if (current_thread_info()->fpsaved[0] & flag)
|
|
value = *(u64 *)&f->regs[freg];
|
|
switch (asi) {
|
|
case ASI_P:
|
|
case ASI_S: break;
|
|
case ASI_PL:
|
|
case ASI_SL:
|
|
value = __swab64p(&value); break;
|
|
default: goto daex;
|
|
}
|
|
if (put_user (value >> 32, (u32 __user *) sfar) ||
|
|
__put_user ((u32)value, (u32 __user *)(sfar + 4)))
|
|
goto daex;
|
|
} else {
|
|
daex:
|
|
if (tlb_type == hypervisor)
|
|
sun4v_data_access_exception(regs, sfar, sfsr);
|
|
else
|
|
spitfire_data_access_exception(regs, sfsr, sfar);
|
|
return;
|
|
}
|
|
advance(regs);
|
|
}
|